/* ════════════════════════════════════════════════
   Mobile UX Enhancements
   ════════════════════════════════════════════════ */

/* ══════════════════════════════════════════════════════
   MOBILE UX ENHANCEMENTS
   ══════════════════════════════════════════════════════ */

/* ── Bottom Navigation Bar (mobile results view) ── */
.mobile-bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 150;
    background: rgba(7,7,18,0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid rgba(139,92,246,0.15);
    padding: 6px 8px calc(6px + env(safe-area-inset-bottom, 0px));
    box-shadow: 0 -4px 30px rgba(0,0,0,0.4);
}
html.light-mode .mobile-bottom-nav {
    background: rgba(255,255,255,0.95);
    border-top-color: rgba(0,0,0,0.08);
    box-shadow: 0 -4px 20px rgba(0,0,0,0.08);
}
.mob-nav-inner {
    display: flex;
    justify-content: space-around;
    align-items: center;
    max-width: 500px;
    margin: 0 auto;
}
.mob-nav-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 6px 12px;
    border-radius: 12px;
    border: none;
    background: none;
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    -webkit-tap-highlight-color: transparent;
    min-width: 56px;
}
.mob-nav-btn svg { width: 20px; height: 20px; }
.mob-nav-btn.active,
.mob-nav-btn:active {
    color: var(--accent);
    background: rgba(139,92,246,0.12);
}

@media (max-width: 640px) {
    /* Show bottom nav only on mobile */
    .mobile-bottom-nav { display: block; }

    /* ── Header: compact, icons only ── */
    .header { padding: 0 12px; }
    .header-inner { height: 52px; }
    .logo-text { font-size: 16px; }
    .logo-icon { width: 28px; height: 28px; }
    .dashboard-nav-btn span,
    .dashboard-nav-btn:not(svg) {
        font-size: 0; /* hide text */
    }
    .dashboard-nav-btn {
        padding: 8px;
        gap: 0;
        font-size: 0;
    }
    .dashboard-nav-btn svg { width: 18px; height: 18px; }
    .history-btn .history-label { display: none; }
    .history-btn { padding: 8px 10px; gap: 4px; }
    .theme-toggle-btn { width: 36px; height: 36px; }
    .header-actions { gap: 4px; }

    /* ── Hero: tighter mobile layout ── */
    .hero {
        padding: 40px 16px 30px;
        min-height: auto;
    }
    .hero-title {
        font-size: 28px;
        letter-spacing: -1px;
        line-height: 1.15;
    }
    .hero-subtitle {
        font-size: 14px;
        padding: 0 8px;
    }
    .search-box {
        padding: 6px;
        border-radius: 16px;
    }
    .search-input {
        font-size: 14px;
        padding: 10px 14px;
    }
    .search-btn {
        padding: 12px 20px;
        font-size: 14px;
        border-radius: 12px;
    }
    .search-hint { font-size: 11px; }
    .lang-row { gap: 6px; padding: 0 4px; }
    .lang-btn { padding: 6px 12px; font-size: 12px; }

    /* ── Features grid: single column ── */
    .features { grid-template-columns: 1fr; gap: 12px; }
    .feature-card { padding: 16px; }

    /* ── Results view ── */
    .results-section { padding-bottom: 70px; } /* space for bottom nav */
    .video-header { padding: 12px 14px; }
    .video-header-inner {
        flex-direction: column;
        gap: 8px;
        align-items: flex-start;
    }
    .video-header-top {
        flex-wrap: wrap;
        width: 100%;
    }
    .video-title { font-size: 16px; line-height: 1.3; }
    .video-header-actions { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .video-header-actions { display: flex; gap: 6px; padding-bottom: 4px; }
    .tab-nav {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        padding: 0 12px;
        gap: 2px;
    }
    .tab-nav::-webkit-scrollbar { display: none; }
    .tab-btn {
        padding: 10px 14px;
        font-size: 12px;
        white-space: nowrap;
        flex-shrink: 0;
        min-height: 44px; /* touch target */
    }

    /* Video player column */
    .video-column {
        position: static;
        height: auto;
    }
    .video-player-wrap { border-radius: 0; }

    /* Content cards */
    .analysis-column { padding: 12px; gap: 12px; }
    .content-card { border-radius: 14px; }
    .card-header { padding: 12px 14px; }
    .card-body { padding: 14px; }

    /* ── Quiz: larger touch targets ── */
    .quiz-option {
        padding: 14px 16px;
        font-size: 14px;
        min-height: 48px;
        border-radius: 12px;
    }
    .quiz-nav {
        flex-wrap: wrap;
        gap: 8px;
    }
    .quiz-nav-btn {
        flex: 1;
        min-width: 100px;
        min-height: 44px;
        font-size: 13px;
    }
    .quiz-progress { font-size: 12px; }
    .quiz-question { font-size: 15px; line-height: 1.5; }

    /* ── Flashcard modal: bottom sheet on mobile ── */
    .fc-modal-overlay {
        align-items: flex-end;
        padding: 0;
    }
    .fc-modal {
        border-radius: 20px 20px 0 0;
        max-height: 92vh;
        width: 100%;
        max-width: 100%;
        animation: slideUpSheet 0.3s ease;
    }
    @keyframes slideUpSheet {
        from { transform: translateY(100%); }
        to   { transform: translateY(0); }
    }
    .fc-card {
        height: 220px;
        border-radius: 16px;
    }
    .fc-front, .fc-back { padding: 20px 16px; font-size: 15px; }
    .fc-rate-row { flex-wrap: wrap; gap: 6px; }
    .fc-rate-btn {
        flex: 1;
        min-width: 60px;
        min-height: 44px;
        font-size: 12px;
    }

    /* ── Topics/timeline ── */
    .topic-item {
        padding: 14px;
    }
    .topic-summary { font-size: 13px; }

    /* ── Highlights ── */
    .highlight-card { padding: 12px; }

    /* ── Chat FAB ── */
    .chat-fab {
        bottom: 80px; /* above bottom nav */
        right: 14px;
    }
    .chat-panel {
        width: calc(100vw - 16px);
        right: 8px;
        bottom: 140px;
        max-height: 60vh;
        border-radius: 18px;
    }

    /* ── Notes textarea ── */
    .notes-textarea { min-height: 120px; }

    /* ── Key takeaways ── */
    .takeaway-item { padding: 8px 12px; font-size: 13px; }

    /* ── History panel ── */
    .history-panel {
        width: 100vw;
        right: 0;
        top: 52px;
        border-radius: 0 0 16px 16px;
        max-height: 70vh;
    }

    /* ── Export PDF button ── */
    .export-pdf-btn {
        padding: 8px 12px;
        font-size: 11px;
    }
    .new-video-btn {
        padding: 8px 14px;
        font-size: 12px;
    }

    /* ── Bookmark button ── */
    .bookmark-btn { min-height: 40px; }

    /* ── Mind map modal ── */
    .mm-overlay { padding: 8px; }
    .mm-modal { border-radius: 16px; }

    /* ── General touch improvements ── */
    button, [role="button"] {
        -webkit-tap-highlight-color: transparent;
    }
    * { -webkit-text-size-adjust: 100%; }
}

/* Extra small screens (< 380px) */
@media (max-width: 380px) {
    .hero-title { font-size: 24px; }
    .search-btn { padding: 10px 16px; }
    .mob-nav-btn { padding: 4px 8px; font-size: 9px; min-width: 48px; }
    .tab-btn { padding: 8px 10px; font-size: 11px; }
    .video-title { font-size: 14px; }
}

/* ── Safe area for notch devices ── */
@supports(padding: max(0px)) {
    .mobile-bottom-nav {
        padding-bottom: max(6px, env(safe-area-inset-bottom));
    }
    .header {
        padding-top: env(safe-area-inset-top, 0px);
    }
}