/* css/styles.css (完整修正版) */
:root {
    --bg-color: #f0f2f5;
    --text-color: #1f2937;
    --header-bg: #ffffff;
    --card-bg: linear-gradient(135deg, #ffffff 0%, #f9fafb 100%);
    --footer-color: #4b5563;
    --shadow-color: rgba(0, 0, 0, 0.05);
    --group-bg: #ffffff;
    --group-title: #374151;
    --transition-time: 0.2s;
    --max-width: 1440px;
    --dropdown-bg: #ffffff;
    --copy-btn-bg: rgba(255, 255, 255, 0.8);
    --copy-btn-hover: #ffffff;
    --link-hover-color: #2563eb;

    --input-bg: #f9fafb;
    --input-border-color: #d1d5db;
    --input-focus-border-color: #2563eb;
    --input-focus-shadow: rgba(37, 99, 235, 0.1);

    --btn-primary-bg: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    --btn-primary-color: white;
    --btn-primary-shadow-color: rgba(79, 70, 229, 0.4);
    --btn-secondary-bg: #e5e7eb;
    --btn-secondary-color: #374151;
    --btn-secondary-hover-bg: #d1d5db;
    --btn-secondary-hover-border-color: #9ca3af;
    
    --bookmark-card-bg: linear-gradient(145deg, #ffffff 0%, #eef2f7 100%);
    --bookmark-favicon-fallback-bg: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --favicon-bg: #eef2f7;
    --favicon-shadow: rgba(0,0,0,0.03);
    --star-filled-color: #f59e0b;
    --star-empty-color: #d1d5db;
    --card-action-btn-bg: rgba(0, 0, 0, 0.03);
    --card-action-btn-hover-bg: rgba(0, 0, 0, 0.07);
    --card-action-btn-color: #4b5563;
    --edit-btn-hover-bg: #dcfce7;
    --delete-btn-hover-bg: #fee2e2;
    --tag-bg: linear-gradient(135deg, #eff6ff 0%, #e0e7ff 100%);
    --tag-color: #3b82f6;
    --loading-spinner-color: #2563eb;
}

[data-theme="dark"] {
    --bg-color: #111827;
    --text-color: #d1d5db;
    --header-bg: #1f2937;
    --card-bg: linear-gradient(135deg, #1f2937 0%, #374151 100%);
    --footer-color: #9ca3af;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --group-bg: #1f2937;
    --group-title: #9ca3af;
    --dropdown-bg: #374151;
    --copy-btn-bg: rgba(0, 0, 0, 0.5);
    --copy-btn-hover: rgba(0, 0, 0, 0.7);
    --link-hover-color: #60a5fa;

    --input-bg: #374151;
    --input-border-color: #4b5563;
    --input-focus-border-color: #60a5fa;
    --input-focus-shadow: rgba(96, 165, 250, 0.2);

    --btn-primary-bg: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    --btn-primary-color: white;
    --btn-primary-shadow-color: rgba(59, 130, 246, 0.4);
    --btn-secondary-bg: #374151;
    --btn-secondary-color: #d1d5db;
    --btn-secondary-hover-bg: #4b5563;
    --btn-secondary-hover-border-color: #6b7280;

    --bookmark-card-bg: linear-gradient(145deg, #1f2937 0%, #293548 100%);
    --bookmark-favicon-fallback-bg: linear-gradient(135deg, #5252ed 0%, #7648d7 100%);
    --favicon-bg: #374151;
    --favicon-shadow: rgba(0,0,0,0.1);
    --star-filled-color: #f59e0b;
    --star-empty-color: #4b5563;
    --card-action-btn-bg: rgba(255, 255, 255, 0.05);
    --card-action-btn-hover-bg: rgba(255, 255, 255, 0.1);
    --card-action-btn-color: #9ca3af;
    --edit-btn-hover-bg: #166534; /* Darker green indication */
    --delete-btn-hover-bg: #991b1b; /* Darker red indication */
    --tag-bg: linear-gradient(135deg, #1e3a8a 0%, #1e40af 100%);
    --tag-color: #bfdbfe;
    --loading-spinner-color: #60a5fa;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s, color 0.3s;
    font-size: 16px;
    line-height: 1.6;
}

/* Generic container for index.html */
.container { 
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem 1.5rem;
    width: 100%;
    box-sizing: border-box;
    flex: 1;
}

/* Generic header for index.html */
header { 
    background-color: var(--header-bg);
    padding: 1.2rem;
    text-align: center;
    position: relative;
    box-shadow: 0 2px 4px var(--shadow-color);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--max-width);
    margin: 0 auto;
    position: relative;
}

.header-container h1 {
    margin: 0;
    flex-grow: 1;
    text-align: center;
    font-size: 1.5rem;
    font-weight: 600;
}

/* index.html specific styles */
.group-navigation { position: relative; z-index: 100; }
.group-nav-toggle { background: var(--input-bg); border: 1px solid var(--input-border-color); border-radius: 6px; padding: 8px 12px; cursor: pointer; color: var(--text-color); font-size: 0.9rem; transition: all 0.2s ease; white-space: nowrap; }
.group-nav-toggle:hover { background: var(--group-bg); border-color: var(--text-color); }
.group-nav-dropdown { position: absolute; top: 100%; left: 0; width: 200px; max-height: 0; overflow: hidden; background: var(--dropdown-bg); border-radius: 6px; box-shadow: 0 4px 12px var(--shadow-color); transition: max-height 0.3s ease, opacity 0.3s ease, visibility 0.3s; z-index: 100; opacity: 0; visibility: hidden; margin-top: 5px; border: 1px solid var(--input-border-color); }
.group-nav-dropdown.active { max-height: 400px; opacity: 1; visibility: visible; overflow-y: auto; }
.group-nav-item { padding: 10px 15px; cursor: pointer; color: var(--text-color); border: none; background: none; width: 100%; text-align: left; transition: background-color 0.2s; }
.group-nav-item:hover { background-color: var(--group-bg); }
.theme-switch { background: var(--input-bg); border: 1px solid var(--input-border-color); border-radius: 50%; width: 40px; height: 40px; cursor: pointer; display: flex; align-items: center; justify-content: center; box-shadow: 0 1px 3px var(--shadow-color); transition: all 0.3s ease; z-index: 10; touch-action: manipulation; color: var(--text-color); font-size: 1.1rem; }
.theme-switch:hover { transform: scale(1.1) rotate(15deg); box-shadow: 0 2px 6px var(--shadow-color); }
.search-container { margin: 1rem 0 2rem; padding: 0 1rem; box-sizing: border-box; }
.search-input { width: 100%; padding: 0.8rem 1.2rem; border-radius: 24px; border: 1px solid var(--input-border-color); background: var(--input-bg); color: var(--text-color); font-size: 1rem; transition: all 0.3s ease; box-sizing: border-box; max-width: 100%; -webkit-appearance: none; }
.search-input:focus { outline: none; border-color: var(--input-focus-border-color); box-shadow: 0 0 0 3px var(--input-focus-shadow); }
.service-group { background: var(--group-bg); border-radius: 12px; padding: 1.5rem; margin-bottom: 2rem; box-shadow: 0 2px 6px var(--shadow-color); scroll-margin-top: 100px; }
.service-group__title { font-size: 1.25em; margin: 0 0 1.2rem; position: relative; padding-left: 1rem; color: var(--group-title); line-height: 1.3; font-weight: 600; }
.service-group__title::before { content: ""; position: absolute; left: 0; top: 50%; transform: translateY(-50%); width: 4px; height: 1.2em; background: var(--link-hover-color); border-radius: 2px; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.5rem; }
.service-card { background: var(--card-bg); border-radius: 10px; padding: 1rem 1.2rem; min-height: 80px; display: flex; flex-direction: column; align-items: center; justify-content: center; position: relative; cursor: pointer; border: 1px solid var(--input-border-color); color: var(--text-color); font-size: 0.95em; text-align: center; transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s; line-height: 1.4; word-break: break-word; }
.service-card:hover { transform: translateY(-3px); box-shadow: 0 4px 12px var(--shadow-color); border-color: var(--link-hover-color); }
.service-card:active { transform: scale(0.97) translateY(0); }
.service-card:focus { outline: 2px solid var(--link-hover-color); outline-offset: 2px; }
.service-card__badge { position: absolute; top: 8px; right: 8px; background: var(--tag-bg); color: var(--tag-color); padding: 3px 8px; border-radius: 12px; font-size: 0.75em; font-weight: 500; }
.copy-url-btn { position: absolute; top: 8px; left: 8px; background-color: var(--copy-btn-bg); border: 1px solid var(--input-border-color); border-radius: 6px; width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; cursor: pointer; opacity: 0.7; transition: opacity 0.2s, background-color 0.2s, border-color 0.2s; z-index: 2; padding: 0; font-size: 14px; color: var(--text-color); }
.copy-url-btn:hover { opacity: 1; background-color: var(--copy-btn-hover); border-color: var(--text-color); }
.copy-url-btn:active { transform: scale(0.9); }
.copy-success { position: fixed; top: 20px; left: 50%; transform: translateX(-50%); background-color: var(--header-bg); color: var(--text-color); padding: 10px 20px; border-radius: 8px; box-shadow: 0 3px 10px var(--shadow-color); z-index: 10000; opacity: 0; transition: opacity 0.3s, transform 0.3s; font-weight: 500; }
.copy-success.show { opacity: 1; transform: translateX(-50%) translateY(10px); }

/* --- GLOBAL MODAL STYLES (Fix for bookmarks page) --- */
.modal {
    backdrop-filter: blur(8px);
    background: rgba(0, 0, 0, 0.6);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: var(--bg-color);
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--group-bg);
    width: 90%;
    max-width: 440px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    padding: 1.25rem 1.5rem 1rem 1.5rem;
    border-bottom: 1px solid var(--group-bg);
}

.modal-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
}

.modal-body { padding: 1.5rem; }
.form-group { margin-bottom: 1rem; }
.form-group:last-child { margin-bottom: 0; }
.form-group label { display: block; font-weight: 500; font-size: 0.875rem; color: var(--text-color); margin-bottom: 0.5rem; }
.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    border: 2px solid var(--input-border-color, var(--group-bg));
    border-radius: 10px;
    padding: 10px 12px;
    font-size: 14px;
    background: var(--input-bg, var(--group-bg));
    color: var(--text-color);
    transition: all 0.3s ease;
    box-sizing: border-box;
    outline: none;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    border-color: var(--input-focus-border-color, #4f46e5);
    box-shadow: 0 0 0 3px var(--input-focus-shadow, rgba(79, 70, 229, 0.1));
}
.form-group textarea { resize: vertical; min-height: 70px; }
.form-actions {
    padding: 1rem 1.5rem 1.25rem 1.5rem;
    border-top: 1px solid var(--group-bg);
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
}
.btn { padding: 10px 20px; border-radius: 10px; font-size: 14px; font-weight: 500; cursor: pointer; transition: all 0.3s ease; border: none; outline: none; }
.btn-primary { background: var(--btn-primary-bg); color: var(--btn-primary-color); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 4px 12px var(--btn-primary-shadow-color); }
.btn-secondary { background: var(--btn-secondary-bg); color: var(--btn-secondary-color); border: 2px solid transparent; }
.btn-secondary:hover { border-color: var(--btn-secondary-hover-border-color); background: var(--btn-secondary-hover-bg); }

/* --- GLOBAL LOADING & EMPTY STATES --- */
.empty-state, .loading { color: var(--text-color); }
.empty-state { text-align: center; padding: 3rem 2rem; background: var(--group-bg); border-radius: 20px; margin: 2rem 0; }
.empty-state::before { content: "📚"; font-size: 3rem; display: block; margin-bottom: 1rem; opacity: 0.6; }
.empty-state h3 { font-size: 1.25rem; margin: 0 0 0.75rem 0; opacity: 0.8; }
.empty-state p { font-size: 0.9rem; opacity: 0.6; max-width: 400px; margin: 0 auto; line-height: 1.6; }
.loading { display: flex; flex-direction: column; align-items: center; padding: 2rem; }
.loading::before { content: ""; width: 32px; height: 32px; border: 3px solid var(--group-bg); border-top: 3px solid var(--loading-spinner-color); border-radius: 50%; animation: spin 1s linear infinite; margin-bottom: 1rem; }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* --- GLOBAL RESPONSIVE STYLES --- */
footer { background-color: var(--header-bg); padding: 1.5rem 1rem; text-align: center; margin-top: auto; box-shadow: 0 -2px 4px var(--shadow-color); font-size: 0.9em; color: var(--footer-color); border-top: 1px solid var(--input-border-color); }
@media (max-width: 768px) {
    body { font-size: 15px; }
    .container { padding: 1.2rem 1rem; }
    .search-container { padding: 0 0.5rem; margin: 0.5rem 0 1.5rem; }
    .card-grid { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; }
    @media (max-width: 480px) { .card-grid { grid-template-columns: 1fr; } }
    .service-group { padding: 1rem; margin-bottom: 1.5rem; border-radius: 10px; }
    .service-group__title { font-size: 1.1em; margin-bottom: 1rem; padding-left: 0.75rem; }
    .service-group__title::before { width: 3px; height: 1em; }
    .service-card { min-height: 70px; font-size: 0.9em; padding: 0.8rem; border-radius: 8px; }
    .group-nav-toggle { padding: 6px 10px; font-size: 0.8rem; }
    .header-container { flex-wrap: wrap; justify-content: center; }
    .header-container h1 { order: -1; width: 100%; margin-bottom: 10px; font-size: 1.25rem; }
    .group-navigation { margin-right: 10px; }
    .theme-switch { width: 36px; height: 36px; font-size: 1rem; }
    footer { padding: 1rem; font-size: 0.85em; }

    /* Responsive modal from bookmarks.html */
    .modal-content { margin: 1rem; max-width: calc(100% - 2rem); }
    .form-actions { flex-direction: column; }
    .btn { width: 100%; justify-content: center; }
}

@media (max-width: 480px) {
    .header-container h1 { font-size: 1.15em; }
    .search-input { padding: 0.7rem 1rem; font-size: 0.95em; }
    .group-navigation, .theme-switch { margin-top: 10px; }
}