/* CSS Variables for Theme System */
:root {
    /* Light Theme Colors - Gemini Inspired */
    --color-background: #f8f9fa;
    --color-surface: #ffffff;
    --color-surface-variant: #f1f3f4;
    --color-primary: #1a73e8;
    --color-primary-hover: #1557b0;
    --color-secondary: #8430ce;
    --color-accent: #ea4335;
    
    /* Text Colors */
    --color-text-primary: #202124;
    --color-text-secondary: #5f6368;
    --color-text-tertiary: #9aa0a6;
    --color-text-inverse: #ffffff;
    
    /* Borders & Dividers */
    --color-border: #dadce0;
    --color-border-light: #e8eaed;
    --color-divider: #f1f3f4;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);
    --shadow-md: 0 1px 3px 0 rgba(60, 64, 67, 0.3), 0 4px 8px 3px rgba(60, 64, 67, 0.15);
    --shadow-lg: 0 2px 6px 2px rgba(60, 64, 67, 0.15), 0 8px 24px 4px rgba(60, 64, 67, 0.15);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-surface: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    /* Typography */
    --font-family: 'Google Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme */
[data-theme="dark"] {
    --color-background: #1e1e1e;
    --color-surface: #2a2a2a;
    --color-surface-variant: #333333;
    --color-primary: #8ab4f8;
    --color-primary-hover: #aecbfa;
    --color-secondary: #c58af9;
    --color-accent: #f28b82;
    
    --color-text-primary: #e8eaed;
    --color-text-secondary: #9aa0a6;
    --color-text-tertiary: #5f6368;
    --color-text-inverse: #202124;
    
    --color-border: #3c4043;
    --color-border-light: #333333;
    --color-divider: #2a2a2a;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3), 0 1px 3px 1px rgba(0, 0, 0, 0.15);
    --shadow-md: 0 1px 3px 0 rgba(0, 0, 0, 0.3), 0 4px 8px 3px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 2px 6px 2px rgba(0, 0, 0, 0.15), 0 8px 24px 4px rgba(0, 0, 0, 0.15);
    
    --gradient-surface: linear-gradient(135deg, #2a2a2a 0%, #1e1e1e 100%);
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Subscription Modal */
.subscription-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.subscription-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
}

.subscription-modal-content {
    position: relative;
    z-index: 10001;
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 1000px;
    max-height: 90vh;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
    
    /* Hide scrollbar while keeping scroll functionality */
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE and Edge */
}

.subscription-modal-content::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

.modal-close-btn {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 36px;
    height: 36px;
    border: none;
    background: var(--color-surface-variant);
    color: var(--color-text-secondary);
    border-radius: 50%;
    font-size: 24px;
    line-height: 1;
    cursor: pointer;
    z-index: 10002;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.modal-close-btn:hover {
    background: var(--color-surface-hover);
    color: var(--color-text);
    transform: scale(1.1);
}

.subscription-header {
    padding: var(--spacing-xl);
    text-align: center;
    background: var(--gradient-primary);
    color: var(--color-text-inverse);
    position: sticky;
    top: 0;
    z-index: 10;
}

.subscription-header h2 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
}

.subscription-header p {
    font-size: var(--font-size-base);
    opacity: 0.95;
}

.subscription-body {
    padding: var(--spacing-xl);
}

.plan-card {
    text-align: center;
}

.plan-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: #10b981;
    color: white;
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-md);
}

.plan-name {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
}

.plan-trial-highlight {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    color: white;
}

.trial-main {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.trial-sub {
    font-size: var(--font-size-sm);
    opacity: 0.95;
}

.plan-price-later {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--color-surface-variant);
    border-radius: var(--radius-md);
}

.price-label {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-xs);
}

.price-amount {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

.price-period {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
}

.plan-features {
    list-style: none;
    padding: 0;
    margin: var(--spacing-lg) 0;
    text-align: left;
}

.plan-features li {
    padding: var(--spacing-sm) 0;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.subscribe-btn {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--gradient-primary);
    color: var(--color-text-inverse);
    border: none;
    border-radius: var(--radius-full);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-md);
}

.subscribe-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.plan-note {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    line-height: 1.6;
}

.subscription-modal-footer {
    padding: var(--spacing-md) var(--spacing-xl);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: center;
    background: var(--color-surface-variant);
}

.subscription-logout-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--color-text-tertiary);
    font-size: var(--font-size-xs);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.subscription-logout-btn:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

/* Terms of Service Modal */
.terms-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.terms-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
}

.terms-modal-content {
    position: relative;
    z-index: 10001;
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 700px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
}

.terms-modal-header {
    padding: var(--spacing-xl) var(--spacing-xl) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.terms-modal-header h2 {
    font-size: var(--font-size-2xl);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.terms-modal-header p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.terms-modal-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    max-height: 50vh;
}

.terms-content {
    color: var(--color-text-primary);
    line-height: 1.7;
}

.terms-content h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.terms-content h3:first-child {
    margin-top: 0;
}

.terms-content h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.terms-content p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
}

.terms-content ul {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
}

.terms-content li {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
}

/* Removed terms-notice styles - using plain text with bold/italic instead */

.terms-modal-footer {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-top: 1px solid var(--color-border);
    background: var(--color-surface-variant);
}

.terms-checkbox {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 2px solid var(--color-border);
}

.terms-checkbox input[type="checkbox"] {
    margin-top: 4px;
    width: 20px;
    height: 20px;
    cursor: pointer;
    flex-shrink: 0;
}

.terms-checkbox label {
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    line-height: 1.6;
    cursor: pointer;
    user-select: none;
}

.terms-modal-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
}

.terms-btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
}

.terms-btn.cancel {
    background: var(--color-surface);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

.terms-btn.cancel:hover {
    background: var(--color-surface-variant);
}

.terms-btn.accept {
    background: var(--gradient-primary);
    color: var(--color-text-inverse);
    box-shadow: var(--shadow-sm);
}

.terms-btn.accept:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.terms-btn.accept:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

@media (max-width: 768px) {
    .terms-modal-content {
        max-height: 90vh;
    }
    
    .terms-modal-header,
    .terms-modal-footer {
        padding: var(--spacing-md);
    }
    
    .terms-modal-body {
        padding: var(--spacing-md);
    }
}

body {
    font-family: var(--font-family);
    background: var(--color-background);
    color: var(--color-text-primary);
    line-height: 1.6;
    font-weight: 400;
    font-size: var(--font-size-base);
    height: 100vh;
    overflow: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* App container with sidebar layout */
.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* Sidebar styles */
.sidebar {
    width: 320px;
    background: var(--gradient-surface);
    color: var(--color-text-primary);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-slow);
    z-index: 100;
    box-shadow: var(--shadow-md);
    border-right: 1px solid var(--color-border);
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-header h1 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.new-chat-btn {
    width: 40px;
    height: 40px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    background: var(--color-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.new-chat-btn:hover {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
    transform: scale(1.05);
}

/* History Tabs */
.history-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border-light);
}

.history-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
}

/* History List */
.history-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.history-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--color-text-tertiary);
    height: 100%;
    min-height: 200px;
}

.history-empty svg {
    margin-bottom: var(--spacing-md);
}

.history-empty p {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.history-empty span {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    line-height: 1.6;
}

.history-item {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
    position: relative;
}

.history-item:hover {
    background: var(--color-surface-variant);
    border-color: var(--color-border);
}

.history-item.active {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

.history-item-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.history-item-thumbnail {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    object-fit: cover;
    flex-shrink: 0;
    background: var(--color-surface-variant);
}

.history-item-content {
    flex: 1;
    min-width: 0;
}

.history-item-prompt {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 4px;
}

.history-item.active .history-item-prompt {
    color: var(--color-text-inverse);
}

.history-item-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.history-item.active .history-item-meta {
    color: var(--color-text-inverse);
    opacity: 0.9;
}

.history-item-type {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.history-item-actions {
    display: flex;
    gap: var(--spacing-xs);
    opacity: 0;
    transition: opacity var(--transition-fast);
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
}

.history-item:hover .history-item-actions {
    opacity: 1;
}

.history-action-btn {
    width: 28px;
    height: 28px;
    border: none;
    border-radius: var(--radius-md);
    background: var(--color-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.history-action-btn:hover {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    transform: scale(1.1);
}

.history-action-btn.favorite.active {
    background: #fbbf24;
    color: white;
}

/* Storage Info */
.storage-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    background: var(--color-surface-variant);
    border-radius: var(--radius-md);
}

.storage-text {
    flex: 1;
}

.footer-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    flex-wrap: wrap;
}

.footer-separator {
    color: var(--color-text-tertiary);
    opacity: 0.5;
}

.footer-link {
    color: var(--color-text-tertiary);
    text-decoration: none;
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 4px;
}

.footer-link:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

.contact-link svg {
    flex-shrink: 0;
}

/* Auth0認証UI (Gemini-style) - Sidebar version (hidden) */
.sidebar .auth-section {
    display: none;
}

.auth-status {
    display: flex;
    justify-content: center;
    padding: var(--spacing-md);
}

.loading-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.auth-buttons {
    display: flex;
    justify-content: center;
}

.auth-btn {
    padding: var(--spacing-sm) var(--spacing-xl);
    text-align: center;
    text-decoration: none;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
    border: 1px solid var(--color-border);
}

.auth-btn.primary {
    background: var(--gradient-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.auth-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-surface-variant);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.user-info:hover {
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
}

.user-avatar-circle {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    color: var(--color-text-inverse);
    font-weight: 600;
    flex-shrink: 0;
}

.avatar-text {
    text-transform: uppercase;
}

.user-details {
    flex: 1;
    min-width: 0;
}

.user-name {
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 2px;
}

.user-email {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 認証警告スタイル (Gemini-style card) */
.auth-warning {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-background);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-lg);
    pointer-events: all; /* Ensure clicks work */
}

.auth-warning-content {
    background: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    text-align: center;
    max-width: 420px;
    border: 1px solid var(--color-border);
    pointer-events: all;
    position: relative;
    z-index: 1001;
}

.auth-warning-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.auth-warning-content h3 {
    margin: 0 0 var(--spacing-md) 0;
    color: var(--color-text-primary);
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.auth-warning-content > p {
    margin: 0 0 var(--spacing-lg) 0;
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-size: var(--font-size-base);
}

.terms-preview {
    background: var(--color-surface-variant);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    text-align: left;
}

.terms-preview h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.terms-summary p {
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.terms-summary ul {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.terms-summary li {
    margin-bottom: var(--spacing-xs);
}

.terms-link {
    text-align: center;
    margin-top: var(--spacing-md) !important;
}

.terms-link a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
}

.terms-link a:hover {
    text-decoration: underline;
}

.terms-agreement-notice {
    background: rgba(234, 67, 53, 0.1);
    border: 1px solid var(--color-accent);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.terms-agreement-notice p {
    margin: 0;
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    text-align: center;
}

/* CTA Message in Chat */
.cta-message {
    display: flex;
    justify-content: center;
    margin: var(--spacing-lg) 0;
}

.cta-message .message-content {
    background: var(--gradient-primary);
    color: var(--color-text-inverse);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
    max-width: 500px;
    width: 100%;
}

.cta-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

.cta-text {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin: 0;
}

.cta-buttons {
    display: flex;
    justify-content: center;
}

.cta-btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 600;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.cta-btn.primary {
    background: var(--color-surface);
    color: var(--color-primary);
    border: 2px solid var(--color-surface);
}

.cta-btn.primary:hover {
    background: var(--color-surface-variant);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.cta-btn.secondary {
    background: transparent;
    color: var(--color-text-inverse);
    border: 2px solid var(--color-text-inverse);
}

.cta-btn.secondary:hover {
    background: var(--color-text-inverse);
    color: var(--color-primary);
    transform: translateY(-2px);
}

.cta-agreement {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.cta-agreement p {
    margin: 0 0 var(--spacing-xs) 0;
}

.cta-note {
    font-size: var(--font-size-sm);
    margin: 0;
    opacity: 0.9;
}

/* Terms Preview Message */
.terms-preview-message {
    display: flex;
    justify-content: center;
    margin: var(--spacing-lg) 0;
}

.terms-preview-message .message-content {
    background: var(--color-surface-variant);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    max-width: 600px;
    width: 100%;
}

.terms-preview-content h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.terms-highlights p {
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.terms-highlights ul {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.terms-highlights li {
    margin-bottom: var(--spacing-xs);
}

.terms-full-link {
    text-align: center;
    margin-top: var(--spacing-md) !important;
}

.terms-full-link a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
}

.terms-full-link a:hover {
    text-decoration: underline;
}

.auth-warning-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-xl);
}

.auth-warning-btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: pointer;
    pointer-events: all;
    display: inline-block;
}

.auth-warning-btn.primary {
    background: var(--gradient-primary);
    color: var(--color-text-inverse);
    border: none;
    box-shadow: var(--shadow-md);
}

.auth-warning-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.auth-warning-btn.secondary {
    background: var(--color-surface);
    color: var(--color-primary);
    border: 1px solid var(--color-border);
}

.auth-warning-btn.secondary:hover {
    background: var(--color-surface-variant);
    border-color: var(--color-primary);
}

/* 無効化状態でのスタイル調整 */
.main-content {
    position: relative;
    transition: opacity 0.3s ease, pointer-events 0.3s ease;
}

/* 処理中ボタンスタイル */
.send-btn.processing {
    background: linear-gradient(45deg, #007bff, #0056b3);
    animation: processingPulse 1.5s ease-in-out infinite;
    cursor: not-allowed;
}

@keyframes processingPulse {
    0%, 100% { opacity: 0.8; }
    50% { opacity: 1; }
}

.send-btn:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

/* 画像モード選択UI */
.image-mode-selector {
    display: none;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 8px;
    margin-bottom: 1rem;
    border: 1px solid #e0e0e0;
}

.image-mode-selector.show {
    display: block;
}

.image-mode-title {
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: #333;
    font-size: 0.9rem;
}

.image-mode-options {
    display: flex;
    gap: 0.5rem;
}

.image-mode-btn {
    flex: 1;
    padding: 0.75rem;
    border: 2px solid #e0e0e0;
    background: white;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    font-size: 0.8rem;
}

.image-mode-btn:hover {
    border-color: #007bff;
    background: #f0f8ff;
}

.image-mode-btn.active {
    border-color: #007bff;
    background: #007bff;
    color: white;
}

.image-mode-btn .mode-icon {
    display: block;
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.image-mode-btn .mode-text {
    display: block;
    font-weight: 500;
}

/* Old usage-guide styles removed - now using history-list */

.feature-list {
    list-style: none;
    margin-bottom: 24px;
}

.feature-list li {
    padding: 12px 16px;
    margin-bottom: 8px;
    background: rgba(255, 255, 255, 0.7);
    border-radius: 8px;
    font-size: 0.9rem;
    line-height: 1.5;
    border-left: 3px solid #6c757d;
}

.feature-list li:last-child {
    margin-bottom: 0;
}

.feature-list strong {
    color: #495057;
    font-weight: 600;
}



.sidebar-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.theme-toggle-sidebar {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: none;
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
    width: 100%;
    text-align: left;
}

.theme-toggle-sidebar:hover {
    background: var(--color-surface-variant);
    color: var(--color-text-primary);
}

/* Main content area */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100vh;
    min-width: 0; /* Prevents flex item from overflowing */
}

.main-header {
    background: var(--color-surface);
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    gap: var(--spacing-md);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex: 1;
    min-width: 0;
}

.header-title-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    align-items: center;
}

/* Generation Mode Switch */
.generation-mode-switch {
    display: flex;
    align-items: center;
    transform: scale(0.7);
    transform-origin: center;
}

.mode-switch {
    position: relative;
    display: flex;
    background: var(--color-surface-variant);
    border-radius: var(--radius-full);
    padding: 4px;
    border: 1px solid var(--color-border);
}

.mode-switch input[type="radio"] {
    display: none;
}

.switch-slider {
    position: relative;
    display: flex;
    align-items: center;
}

.switch-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    z-index: 2;
    position: relative;
}

.switch-indicator {
    position: absolute;
    top: 4px;
    left: 4px;
    width: calc(50% - 4px);
    height: calc(100% - 8px);
    background: var(--color-surface);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-base);
    z-index: 1;
}

#mode-image:checked ~ .switch-slider .switch-indicator {
    transform: translateX(0);
}

#mode-video:checked ~ .switch-slider .switch-indicator {
    transform: translateX(100%);
}

#mode-image:checked ~ .switch-slider label[for="mode-image"] {
    color: var(--color-primary);
}

#mode-video:checked ~ .switch-slider label[for="mode-video"] {
    color: var(--color-primary);
}

.main-header h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
    line-height: 1.2;
}

.header-model-selector {
    display: flex;
    align-items: center;
    flex: 1;
    max-width: 300px;
}

.header-model-selector .custom-select {
    min-width: 180px;
    width: 100%;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* Header Auth Styles (Gemini-style) */
.header-auth {
    display: flex;
    align-items: center;
}

.header-auth-buttons {
    display: flex;
}

.header-auth-btn {
    padding: 8px 16px;
    text-decoration: none;
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 500;
    background: var(--gradient-primary);
    color: var(--color-text-inverse);
    border: 1px solid var(--color-primary);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.header-auth-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.header-user-info {
    position: relative;
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.header-user-info:hover {
    background: var(--color-surface-variant);
}

.header-user-info .user-avatar-circle {
    width: 32px;
    height: 32px;
    font-size: 14px;
}

.user-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 240px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: none;
    z-index: 1000;
    overflow: hidden;
}

.header-user-info:hover .user-dropdown {
    display: block;
    animation: slideDown var(--transition-fast);
}

.user-dropdown-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border-light);
}

.user-dropdown-header .user-name {
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    margin-bottom: 4px;
}

.user-dropdown-header .user-email {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

.user-subscription-info {
    padding: var(--spacing-md);
    border-top: 1px solid var(--color-border-light);
    border-bottom: 1px solid var(--color-border-light);
}

.subscription-status {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
}

.status-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    font-weight: 500;
}

.status-value {
    font-size: var(--font-size-sm);
    font-weight: 600;
    padding: 4px var(--spacing-sm);
    border-radius: var(--radius-md);
}

.status-value.trialing {
    background: #10b981;
    color: white;
}

.status-value.active {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

.status-value.admin {
    background: #f59e0b;
    color: white;
}

.status-value.none {
    background: var(--color-surface-variant);
    color: var(--color-text-secondary);
}

.user-dropdown-action {
    display: block;
    padding: var(--spacing-md);
    text-decoration: none;
    color: var(--color-accent);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.user-dropdown-action:hover {
    background: var(--color-surface-variant);
}

.theme-toggle {
    background: var(--color-surface-variant);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--color-text-secondary);
}

.theme-toggle:hover {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    transform: scale(1.05);
}

.theme-toggle:active {
    transform: scale(0.95);
}

.sidebar-toggle {
    display: flex;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    color: var(--color-text-secondary);
    transition: all 0.2s ease;
    align-items: center;
    justify-content: center;
}

.sidebar-toggle svg {
    width: 20px;
    height: 20px;
}

.sidebar-toggle:hover {
    background: var(--color-surface-variant);
    color: var(--color-text-primary);
}

/* Chat container */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0; /* Important for proper scrolling */
    background: var(--color-background);
}

.chat-history {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
    background: var(--color-background);
    transition: background-color var(--transition-base);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.chat-history > * {
    width: 100%;
    max-width: 900px; /* Gemini-style centered layout */
}

/* Floating Input Container (Gemini-style) */
.floating-input-container {
    position: sticky;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    background: linear-gradient(to top, var(--color-background) 0%, var(--color-background) 60%, transparent 100%);
    pointer-events: none; /* Allow clicks through the gradient */
}

.floating-input-container > * {
    pointer-events: all; /* Re-enable clicks on children */
    width: 100%;
    max-width: 750px; /* Slightly narrower than chat for floating effect */
}

/* Floating input wrapper */
.chat-input-wrapper {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xs) var(--spacing-sm);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-fast);
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
}

.chat-input-wrapper:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1), var(--shadow-lg);
}


.chat-input-wrapper.drag-over {
    border-color: var(--color-secondary);
    background: var(--color-surface-variant);
    border-style: dashed;
    border-width: 2px;
}

/* Generation mode toggle */
.generation-mode-toggle {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    justify-content: center;
}

.mode-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    background: var(--color-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.mode-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-surface-variant);
}

.mode-btn.active {
    background: var(--gradient-primary);
    border-color: var(--color-primary);
    color: var(--color-text-inverse);
    box-shadow: var(--shadow-sm);
}

.mode-btn svg {
    flex-shrink: 0;
}

/* Video generation options */
.video-options {
    margin-bottom: 12px;
}

/* Image model options */
.image-model-options {
    margin-bottom: 12px;
}

/* Compact Model Selector */
.model-selector-compact,
.frame-source-compact {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.frame-source-compact {
    justify-content: center;
}

.selector-label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    min-width: 90px;
}

/* Custom Select Dropdown */
.custom-select {
    position: relative;
    flex: 1;
    max-width: 400px;
}

.select-trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    gap: var(--spacing-sm);
    font-size: 14px;
}

.select-trigger:hover {
    border-color: var(--color-primary);
    background: var(--color-surface-variant);
}

.select-trigger.open {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1);
}

.selected-model {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-primary);
}

.select-arrow {
    color: var(--color-text-secondary);
    transition: transform var(--transition-fast);
}

.select-trigger.open .select-arrow {
    transform: rotate(180deg);
}

.select-dropdown {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    min-width: 300px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: none;
    z-index: 1000;
    max-height: 400px;
    overflow-y: auto;
}

.select-dropdown.open {
    display: block;
    animation: slideDown var(--transition-fast);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.select-option {
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    border-bottom: 1px solid var(--color-border-light);
}

.select-option:last-child {
    border-bottom: none;
}

.select-option:hover {
    background: var(--color-surface-variant);
}

.select-option.active {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

.select-option.active .option-desc {
    color: var(--color-text-inverse);
    opacity: 0.9;
}

.option-name {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: 2px;
}

.option-desc {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.option-icon {
    font-size: var(--font-size-lg);
    margin-right: var(--spacing-sm);
}

.option-content {
    flex: 1;
}

.select-option {
    display: flex;
    align-items: center;
}

.dropdown-section {
    padding: var(--spacing-sm) 0;
}

.dropdown-section:not(:last-child) {
    border-bottom: 2px solid var(--color-border);
    padding-bottom: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    background: var(--color-surface-variant);
}

.dropdown-section .select-option {
    padding-left: calc(var(--spacing-md) + var(--spacing-sm)); /* Indent for hierarchy */
}

/* Frame Pills */
.frame-pills {
    display: flex;
    gap: var(--spacing-xs);
    background: var(--color-surface-variant);
    padding: 4px;
    border-radius: var(--radius-full);
}

.frame-pill {
    padding: var(--spacing-xs) var(--spacing-md);
    border: none;
    border-radius: var(--radius-full);
    background: transparent;
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.frame-pill:hover:not(:disabled) {
    background: var(--color-surface);
    color: var(--color-primary);
}

.frame-pill.active {
    background: var(--color-surface);
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.frame-pill:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* Model selection */
.model-selection {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.model-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    font-weight: 500;
    margin-right: var(--spacing-xs);
}

.model-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
    min-width: 80px;
}

.model-btn:hover:not(.active) {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-surface-variant);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.model-btn.active {
    background: var(--gradient-primary);
    border-color: var(--color-primary);
    color: var(--color-text-inverse);
    box-shadow: var(--shadow-md);
}

.model-desc {
    font-size: var(--font-size-xs);
    opacity: 0.9;
    margin-top: var(--spacing-xs);
}

.frame-source-toggle {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.frame-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    background: var(--color-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
    font-weight: 500;
}

.frame-btn:hover:not(:disabled) {
    border-color: var(--color-secondary);
    color: var(--color-secondary);
    background: var(--color-surface-variant);
}

.frame-btn.active {
    background: var(--color-secondary);
    border-color: var(--color-secondary);
    color: var(--color-text-inverse);
    box-shadow: var(--shadow-sm);
}

.frame-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.frame-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    color: var(--color-text-tertiary);
}

/* Sora Options Compact - Gemini-style minimal design */
.sora-options-compact {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.sora-option-group {
    display: flex;
    align-items: center;
    gap: 6px;
}

.sora-option-label {
    font-size: 13px;
    font-weight: 400;
    color: var(--color-text-secondary);
    white-space: nowrap;
}

.sora-select {
    padding: 6px 10px;
    border: none;
    border-radius: 20px;
    background: var(--color-surface-variant);
    color: var(--color-text);
    font-size: 13px;
    font-weight: 400;
    cursor: pointer;
    transition: background 0.2s ease;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    padding-right: 28px;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='12' viewBox='0 0 12 12' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M3 4.5L6 7.5L9 4.5' stroke='%23666' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
}

.sora-select:hover {
    background: var(--color-surface-hover);
}

.sora-select:focus {
    outline: none;
    background: var(--color-surface-hover);
}

.sora-select option {
    background: var(--color-surface);
    color: var(--color-text);
    padding: 8px;
}

.sora-select option:disabled {
    color: var(--color-text-disabled);
    opacity: 0.5;
}

#chat-input {
    flex: 1;
    min-height: 48px;
    max-height: 160px;
    padding: var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    resize: none;
    transition: all var(--transition-fast);
    background: transparent;
    color: var(--color-text-primary);
    line-height: 1.6;
}

#chat-input:focus {
    outline: none;
}

#chat-input::placeholder {
    color: var(--color-text-tertiary);
}

.input-actions {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.upload-btn, .send-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.upload-btn {
    background: transparent;
    color: var(--color-text-secondary);
    flex-shrink: 0;
}

.upload-btn:hover {
    background: var(--color-surface-variant);
    color: var(--color-primary);
    transform: scale(1.1);
}

.upload-btn:active {
    transform: scale(0.95);
}

.translate-btn {
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    align-self: flex-end;
    margin-bottom: 2px;
    margin-right: 4px;
    opacity: 0.6;
}

.translate-btn:hover:not(:disabled) {
    opacity: 1;
    background: var(--color-surface-variant);
    transform: scale(1.05);
}

.translate-btn:active {
    transform: scale(0.95);
}

.translate-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.translate-btn.translating {
    opacity: 1;
    color: var(--color-primary);
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.send-btn {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

.send-btn:hover:not(:disabled) {
    background: var(--color-primary-hover);
    transform: scale(1.1);
}

.send-btn:active:not(:disabled) {
    transform: scale(0.95);
}

.send-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

.send-btn.processing {
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(0.98); }
}

.video-btn {
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: 8px;
}

.video-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.3);
}

.video-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Upload preview */
.upload-preview {
    margin-top: var(--spacing-md);
    position: relative;
    display: inline-block;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    max-width: 300px;
    width: auto;
    transition: transform var(--transition-fast);
    background: var(--color-surface-variant);
}

.upload-preview:hover {
    transform: scale(1.02);
}

.upload-preview img {
    max-width: 100%;
    max-height: 200px;
    object-fit: contain;
    display: block;
    border-radius: var(--radius-md);
}

.remove-upload {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 24px;
    height: 24px;
    border: none;
    border-radius: var(--radius-full);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    cursor: pointer;
    font-size: 12px;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.remove-upload:hover {
    background: var(--color-accent);
    transform: scale(1.15);
}

.remove-upload:active {
    transform: scale(0.95);
}

/* Uploaded image preview in chat bubbles */
.uploaded-image-preview {
    margin-top: 8px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    max-width: 300px;  /* Flexible width */
    width: auto;        /* Auto width based on image */
    position: relative;
    display: inline-block;
}

.uploaded-image-preview img {
    max-width: 100%;
    max-height: 200px;
    object-fit: contain;  /* Maintain aspect ratio, no cropping */
    display: block;
    border-radius: 8px;
}

.uploaded-image-preview span {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    font-size: 0.7rem;
    padding: 2px 6px;
    text-align: center;
}

/* System messages (outside chat bubbles) */
.system-message {
    text-align: center;
    margin: var(--spacing-md) auto;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    background: var(--color-surface-variant);
    border-radius: var(--radius-full);
    display: block;
    max-width: 300px;
    width: fit-content;
    border: 1px solid var(--color-border-light);
}

.system-error {
    color: #dc3545;
    background: rgba(220, 53, 69, 0.1);
}

.system-warning {
    color: #fd7e14;
    background: rgba(253, 126, 20, 0.1);
}

/* Chat messages */
.message {
    margin-bottom: var(--spacing-lg);
    max-width: 100%;
    animation: fadeIn var(--transition-base);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-user {
    text-align: right;
}

.message-ai {
    text-align: left;
}

/* AI messages without text (image/video only) should not have bubble styling */
.message-ai:not(:has(.message-content)) {
    background: transparent;
}

.message-ai .message-image,
.message-ai .message-video {
    margin-top: 0; /* Remove extra margin when no text bubble */
}

.message-content {
    display: inline-block;
    max-width: 80%;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    line-height: 1.7;
}

.message-user .message-content {
    background: var(--gradient-primary);
    color: var(--color-text-inverse);
    border-bottom-right-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
}

.message-ai .message-content {
    background: var(--color-surface);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    border-bottom-left-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
}

.message-image {
    margin-top: var(--spacing-md);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    max-width: 100%;
    transition: transform var(--transition-fast);
    cursor: pointer;
}

.message-image:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

.message-image img {
    width: 100%;
    height: auto;
    display: block;
    max-width: 500px;
    background: var(--color-surface-variant);
}

.download-btn {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.download-btn:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.download-btn:active {
    transform: translateY(0);
}

/* Video display */
.message-video {
    margin-top: var(--spacing-md);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    max-width: 100%;
    background: #000;
    transition: transform var(--transition-fast);
}

.message-video:hover {
    transform: scale(1.01);
    box-shadow: var(--shadow-lg);
}

.message-video video {
    width: 100%;
    height: auto;
    display: block;
    max-width: 600px;
    max-height: 70vh;
    object-fit: contain;
}

.video-controls {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.video-controls button {
    padding: 6px 12px;
    border: 1px solid #dee2e6;
    border-radius: 6px;
    background: white;
    color: #495057;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.2s ease;
}

.video-controls button:hover {
    background: #f8f9fa;
    border-color: #adb5bd;
}

/* Loading animation */
.loading-message {
    text-align: center;
    padding: 20px;
    color: #6c757d;
}

.loading-dots {
    display: inline-block;
}

.loading-dots::after {
    content: '';
    animation: dots 2s infinite;
}

@keyframes dots {
    0%, 20% { content: '.'; }
    40% { content: '..'; }
    60%, 100% { content: '...'; }
}

/* Responsive design */
/* Tablet and Mobile Responsive Design */
@media (max-width: 1024px) {
    .chat-history > *,
    .floating-input-container > * {
        max-width: 100%;
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
    }
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100vh;
        transform: translateX(-100%);
        z-index: 1000;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-content {
        width: 100%;
    }

    .main-header {
        padding: var(--spacing-sm) var(--spacing-md);
        gap: var(--spacing-sm);
        align-items: center;
    }

    .header-left {
        gap: var(--spacing-sm);
        flex-wrap: wrap;
    }

    .main-header h2 {
        font-size: var(--font-size-base);
        white-space: nowrap;
    }
    
    .generation-mode-switch {
        order: 3;
        width: 100%;
        margin-top: var(--spacing-xs);
    }

    .header-model-selector {
        order: 2;
        flex: 1;
        max-width: none;
    }

    .header-model-selector .custom-select {
        min-width: 140px;
    }

    .chat-history {
        padding: var(--spacing-md);
    }

    .floating-input-container {
        padding: var(--spacing-md);
    }

    .message-content {
        max-width: 85%;
        font-size: var(--font-size-sm);
    }

    .chat-input-wrapper {
        gap: var(--spacing-xs);
    }

    .upload-btn, .send-btn {
        width: 36px;
        height: 36px;
    }

    #chat-input {
        font-size: var(--font-size-sm);
    }

    .frame-pills {
        flex-wrap: wrap;
    }

    .frame-pill {
        font-size: var(--font-size-xs);
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .sidebar {
        width: 280px;
    }

    .main-header {
        padding: var(--spacing-xs) var(--spacing-sm);
        gap: var(--spacing-xs);
    }
    
    .sidebar-toggle {
        padding: 6px;
    }
    
    /* Mobile: Show "保存" instead of "ダウンロード" */
    .btn-text-desktop {
        display: none !important;
    }
    
    .btn-text-mobile {
        display: inline !important;
    }
    
    .header-title-group h2 {
        font-size: var(--font-size-sm);
    }
    

    .header-model-selector {
        flex: 1;
        max-width: none;
    }

    .header-model-selector .custom-select {
        min-width: auto;
        width: 100%;
    }

    .select-trigger {
        padding: 6px 10px;
        font-size: var(--font-size-xs);
    }

    .selected-model {
        font-size: var(--font-size-xs);
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }
    
    .select-arrow {
        width: 14px;
        height: 14px;
        flex-shrink: 0;
    }
    
    .select-dropdown {
        min-width: 260px;
        font-size: var(--font-size-sm);
    }
    
    .option-name {
        font-size: var(--font-size-sm);
    }
    
    .option-desc {
        font-size: 11px;
    }

    .chat-history {
        padding: var(--spacing-sm);
    }

    .floating-input-container {
        padding: var(--spacing-sm);
    }

    .message-content {
        max-width: 90%;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .message-video video {
        max-height: 60vh;
    }

    .upload-btn, .send-btn {
        width: 32px;
        height: 32px;
    }
}

/* Overlay for mobile sidebar */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
}

@media (max-width: 768px) {
    .sidebar-overlay.active {
        display: block;
    }
}

/* Focus styles for accessibility */
button:focus-visible,
textarea:focus-visible,
a:focus-visible,
.select-trigger:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Scrollbar styles (Gemini-inspired) */
.chat-history::-webkit-scrollbar,
.history-list::-webkit-scrollbar,
.select-dropdown::-webkit-scrollbar {
    width: 8px;
}

.chat-history::-webkit-scrollbar-track,
.history-list::-webkit-scrollbar-track,
.select-dropdown::-webkit-scrollbar-track {
    background: transparent;
}

.chat-history::-webkit-scrollbar-thumb,
.history-list::-webkit-scrollbar-thumb,
.select-dropdown::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-full);
}

.chat-history::-webkit-scrollbar-thumb:hover,
.history-list::-webkit-scrollbar-thumb:hover,
.select-dropdown::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-tertiary);
}

/* Firefox scrollbar */
.chat-history,
.history-list,
.select-dropdown {
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) transparent;
}

/* WAN Options (same style as Sora) */
.wan-options-compact,
.wan21-options-compact {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
}

.wan-option-group {
    display: flex;
    align-items: center;
    gap: 6px;
}

.wan-option-label {
    font-size: 13px;
    font-weight: 400;
    color: var(--color-text-secondary);
    white-space: nowrap;
}

.wan-select {
    padding: 6px 10px;
    border: none;
    border-radius: 20px;
    background: var(--color-surface-variant);
    color: var(--color-text);
    font-size: 13px;
    font-weight: 400;
    cursor: pointer;
    transition: background 0.2s ease;
}

.wan-select:hover {
    background: var(--color-surface-hover);
}

.wan-select:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--color-primary);
}

/* Plans Grid Layout */
.plans-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
}

.plan-card {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 400px;
}

.plan-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.2);
    border-color: var(--color-primary);
}

.plan-card.premium-highlight {
    border-color: var(--color-primary);
    border-width: 3px;
}

.plan-card.unlimited-highlight {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    border-color: var(--color-primary);
    border-width: 3px;
}

.plan-badge.recommended {
    background: var(--color-primary);
}

.plan-badge.best {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

.plan-price {
    font-size: 36px;
    font-weight: 700;
    color: var(--color-primary);
    margin: var(--spacing-md) 0;
}

.price-period {
    font-size: 16px;
    font-weight: 400;
    color: var(--color-text-secondary);
}

.plan-features {
    list-style: none;
    padding: 0;
    margin: var(--spacing-md) 0;
    text-align: left;
    flex-grow: 1;
}

.plan-features li {
    padding: var(--spacing-xs) 0;
    font-size: 14px;
    color: var(--color-text);
}

.plan-select-btn {
    width: 100%;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: var(--spacing-md);
}

.plan-select-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.plan-select-btn.premium-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.plan-select-btn.unlimited-btn {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

@media (max-width: 768px) {
    .plans-grid {
        grid-template-columns: 1fr;
    }
    
    .subscription-modal-content {
        max-width: 90%;
    }
}