/* =============================================================================
   POLISH — Final visual refinements, HTMX transitions, dark mode, advanced FX
   ============================================================================= */

/* =============================================================================
   1. PAGE TRANSITIONS via HTMX
   ============================================================================= */

/* HTMX swap indicator — thin top strip */
.htmx-indicator {
    display: none;
}

.htmx-request .htmx-indicator,
.htmx-request.htmx-indicator {
    display: block;
}

#page-loader {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary);
    z-index: 9999;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s var(--ease-out);
}

#page-loader.loading {
    transform: scaleX(0.7);
    transition: transform 8s cubic-bezier(0.1, 0.05, 0, 1);
}

#page-loader.done {
    transform: scaleX(1);
    transition: transform 0.15s var(--ease-out);
    opacity: 0;
    transition: transform 0.15s, opacity 0.4s 0.2s;
}


/* =============================================================================
   2. INK RIPPLE — On buttons and interactive elements
   ============================================================================= */

.btn {
    position: relative;
    overflow: hidden;
}

.ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.25);
    transform: scale(0);
    animation: ripple-out 0.6s ease-out forwards;
    pointer-events: none;
}

@keyframes ripple-out {
    to {
        transform: scale(4);
        opacity: 0;
    }
}


/* =============================================================================
   3. FOCUS VISIBLE — Accessibility ring
   ============================================================================= */

:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

.form-input:focus-visible,
.form-textarea:focus-visible,
.form-select:focus-visible {
    outline: none; /* They use bottom-border instead */
}


/* =============================================================================
   4. SCROLLBAR — Minimal, editorial
   ============================================================================= */

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--outline-variant);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--outline);
}

html {
    scrollbar-width: thin;
    scrollbar-color: var(--outline-variant) transparent;
}


/* =============================================================================
   5. SELECTION — Brand-colored text selection
   ============================================================================= */

::selection {
    background-color: var(--primary-fixed);
    color: var(--on-primary-fixed);
}


/* =============================================================================
   6. HTMX NEW CONTENT FLASH — "swapped in" animation
   ============================================================================= */

.htmx-added {
    animation: fade-in 0.3s var(--ease-out) both;
}

/* Settling content */
.htmx-settling {
    opacity: 1;
}

.htmx-swapping {
    opacity: 0;
    transition: opacity 0.15s ease-out;
}


/* =============================================================================
   7. SMOOTH SCROLLBAR on Sidebar
   ============================================================================= */

.sidebar-nav::-webkit-scrollbar {
    width: 4px;
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background: rgba(114, 119, 133, 0.3);
    border-radius: var(--radius-full);
}


/* =============================================================================
   8. CARD HOVER MICRO-INTERACTIONS
   ============================================================================= */

/* Card icon subtle bounce on parent hover */
.stat-card:hover .stat-icon {
    animation: icon-bounce 0.4s var(--ease-spring) both;
}

@keyframes icon-bounce {
    0%   { transform: scale(1); }
    40%  { transform: scale(1.1); }
    70%  { transform: scale(0.95); }
    100% { transform: scale(1); }
}

/* Nav item slide indicator */
.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
    background: var(--primary);
    border-radius: 0 var(--radius-full) var(--radius-full) 0;
}

.nav-item {
    position: relative;
}


/* =============================================================================
   9. UPLOAD ZONE ENHANCED
   ============================================================================= */

/* Dashed outline effect using background gradient */
.upload-zone {
    background-image: repeating-linear-gradient(
        0deg,
        var(--outline-variant),
        var(--outline-variant) 8px,
        transparent 8px,
        transparent 16px
    ),
    repeating-linear-gradient(
        90deg,
        var(--outline-variant),
        var(--outline-variant) 8px,
        transparent 8px,
        transparent 16px
    ),
    repeating-linear-gradient(
        180deg,
        var(--outline-variant),
        var(--outline-variant) 8px,
        transparent 8px,
        transparent 16px
    ),
    repeating-linear-gradient(
        270deg,
        var(--outline-variant),
        var(--outline-variant) 8px,
        transparent 8px,
        transparent 16px
    );
    background-size: 1px 100%, 100% 1px, 1px 100%, 100% 1px;
    background-position: 0 0, 0 0, 100% 0, 0 100%;
    background-repeat: no-repeat;
}

.upload-zone.dragover {
    background-image: repeating-linear-gradient(
        0deg,
        var(--primary),
        var(--primary) 8px,
        transparent 8px,
        transparent 16px
    ),
    repeating-linear-gradient(
        90deg,
        var(--primary),
        var(--primary) 8px,
        transparent 8px,
        transparent 16px
    ),
    repeating-linear-gradient(
        180deg,
        var(--primary),
        var(--primary) 8px,
        transparent 8px,
        transparent 16px
    ),
    repeating-linear-gradient(
        270deg,
        var(--primary),
        var(--primary) 8px,
        transparent 8px,
        transparent 16px
    );
}


/* =============================================================================
   10. TOOLTIP (CSS-only)
   ============================================================================= */

[data-tooltip] {
    position: relative;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(4px);
    padding: var(--space-1) var(--space-3);
    background-color: var(--inverse-surface);
    color: var(--inverse-on-surface);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--duration-fast) var(--ease-out),
                transform var(--duration-fast) var(--ease-out);
}

[data-tooltip]:hover::after {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}


/* =============================================================================
   11. DARK MODE
   ============================================================================= */

[data-theme="dark"] {
    /* ── Surface ─────────────────────────────────── */
    --surface:                    #121416;
    --surface-dim:                #121416;
    --surface-bright:             #383a3c;
    --surface-container-lowest:   #0d0f10;
    --surface-container-low:      #191c1d;
    --surface-container:          #1e2022;
    --surface-container-high:     #282a2c;
    --surface-container-highest:  #333537;

    /* ── Primary ─────────────────────────────────── */
    --primary:                    #adc7ff;
    --primary-container:          #005bbf;
    --primary-fixed:              #1c3a6e;
    --primary-fixed-dim:          #14305e;
    --on-primary:                 #00315d;
    --on-primary-container:       #d3e3ff;
    --on-primary-fixed:           #d8e2ff;
    --on-primary-fixed-variant:   #adc7ff;

    /* ── On-Surface ──────────────────────────────── */
    --on-surface:                 #e2e3e4;
    --on-surface-variant:         #c1c6d6;
    --inverse-surface:            #e2e3e4;
    --inverse-on-surface:         #2e3132;

    /* ── Outline ─────────────────────────────────── */
    --outline:                    #8b90a0;
    --outline-variant:            #43474f;

    /* ── Secondary ───────────────────────────────── */
    --secondary:                  #c4c8ca;
    --secondary-container:        #444749;
    --on-secondary:               #2e3132;
    --on-secondary-container:     #dee0e1;

    /* ── Tertiary ────────────────────────────────── */
    --tertiary:                   #ffb77d;
    --tertiary-container:         #6e3800;
    --tertiary-fixed:             #3d2100;
    --on-tertiary:                #4c2700;
    --on-tertiary-container:      #ffdcc2;

    /* ── Error ───────────────────────────────────── */
    --error:                      #ffb4ab;
    --error-container:            #490002;
    --on-error:                   #690005;
    --on-error-container:         #ffdad6;

    /* ── Success ─────────────────────────────────── */
    --success:                    #83da96;
    --success-container:          #0a3a1a;
    --on-success:                 #00391b;
    --on-success-container:       #d4f5e0;

    /* ── Shadows (Darker for dark mode) ──────────── */
    --shadow-ambient:  0px 12px 32px rgba(0, 0, 0, 0.30);
    --shadow-glass:    0px 8px 24px rgba(0, 0, 0, 0.25);
    --shadow-elevated: 0px 16px 48px rgba(0, 0, 0, 0.40);
    --shadow-toast:    0px 8px 24px rgba(0, 0, 0, 0.35);

    /* ── Glass ───────────────────────────────────── */
    --glass-bg:       rgba(18, 20, 22, 0.80);
    --glass-border:   rgba(67, 71, 79, 0.30);
}

/* Invert specific elements in dark mode */
[data-theme="dark"] .chip-good {
    background-color: var(--primary-fixed);
    color: var(--primary);
}

[data-theme="dark"] .auth-right {
    background: var(--primary-fixed-dim);
}


/* =============================================================================
   12. PRINT STYLES — For printing results
   ============================================================================= */

@media print {
    .sidebar,
    .top-navbar,
    .toast-container,
    .btn,
    .dropdown {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0 !important;
    }
    
    .page-content {
        padding: 0 !important;
    }
    
    .card {
        break-inside: avoid;
        box-shadow: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
        font-size: 12pt;
    }
    
    .data-table tbody tr {
        background: white !important;
    }
}


/* =============================================================================
   13. ENHANCED RESPONSIVE — Tablet (between 768 and 1024)
   ============================================================================= */

@media (max-width: 1024px) {
    .dropdown-menu {
        right: 0;
        left: auto;
    }
}


/* =============================================================================
   14. MOBILE OVERLAY — Sidebar backdrop
   ============================================================================= */

.sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(25, 28, 29, 0.40);
    z-index: calc(var(--z-sidebar) - 1);
    backdrop-filter: blur(4px);
}

/* Mobile buttons — base styles (hidden on desktop) */
.mobile-menu-btn {
    display: none;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    align-items: center;
    justify-content: center;
    color: var(--on-surface-variant);
    transition: background-color var(--duration-fast);
}

.mobile-menu-btn:hover {
    background-color: var(--surface-container-high);
}

.mobile-home-btn {
    display: none;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    align-items: center;
    justify-content: center;
    color: var(--on-surface-variant);
    text-decoration: none;
    transition: background-color var(--duration-fast), color var(--duration-fast);
    flex-shrink: 0;
}

.mobile-home-btn:hover,
.mobile-home-btn:active {
    background-color: var(--surface-container-high);
    color: var(--primary);
}

/* Mobile overrides — MUST come AFTER base styles so display:flex wins */
@media (max-width: 1024px) {
    .sidebar-backdrop.active {
        display: block;
        animation: fade-in 0.2s ease-out both;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-home-btn {
        display: flex;
    }
}


/* =============================================================================
   15. LOADING BUTTON STATE
   ============================================================================= */

.btn.is-loading {
    color: transparent !important;
    pointer-events: none;
    position: relative;
}

.btn.is-loading::after {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.btn-secondary.is-loading::after,
.btn-tertiary.is-loading::after {
    border-color: rgba(0, 0, 0, 0.1);
    border-top-color: var(--primary);
}


/* =============================================================================
   16. COUNT-UP NUMBER ANIMATION (JS-driven via IntersectionObserver)
   ============================================================================= */

.count-target {
    display: inline-block;
}


/* =============================================================================
   17. TABLE RESPONSIVE — Horizontal scroll on mobile
   ============================================================================= */

.table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

@media (max-width: 1024px) {
    .data-table {
        min-width: 600px;
    }
}


/* =============================================================================
   18. COMPREHENSIVE MOBILE OVERRIDES
   Handles inline styles that can't be overridden in layout.css
   ============================================================================= */

/* ---------- Tablet ≤ 1024px ---------- */
@media (max-width: 1024px) {
    /* Card overflow prevention */
    .card {
        overflow-x: auto;
    }

    /* Dashboard: recent submissions table scroll */
    .card > .data-table {
        min-width: 500px;
    }

    /* Dropdown menu: don't overflow right */
    .dropdown-menu {
        right: 0;
        left: auto;
    }

    /* Submission detail: name image cap */
    .card img[alt="Tên học sinh"] {
        max-width: 260px !important;
    }

    /* Pre/code blocks: scroll horizontally */
    pre {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        font-size: 0.625rem !important;
    }

    /* Upload template table scroll */
    .template-table-wrap {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    /* Exam card actions: stack */
    .exam-card__actions {
        flex-direction: column;
    }

    /* Submission detail: inline flex header → wrap */
    .section-header > div[style*="display: flex"] {
        flex-wrap: wrap;
    }

    /* Results toolbar */
    .card .toolbar,
    [style*="display: flex"][style*="gap"][style*="flex-wrap"] {
        gap: var(--space-2);
    }

    /* Template selector grid → stack */
    .template-selector-grid {
        grid-template-columns: 1fr !important;
    }

    /* Template preview: hide on mobile (hover not available) */
    .template-preview-panel {
        display: none;
    }

    /* Variant tabs: scroll horizontally */
    .variant-tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        flex-wrap: nowrap;
    }

    .variant-tabs-bar {
        flex-wrap: wrap;
        gap: var(--space-2);
    }
}

/* ---------- Phone ≤ 480px ---------- */
@media (max-width: 480px) {
    /* Card padding reduction */
    .card {
        padding: var(--space-3);
    }

    .card-header {
        padding: var(--space-3);
        flex-wrap: wrap;
        gap: var(--space-2);
    }

    /* Exam configurator sidebar: full width */
    .exam-sidebar {
        padding: var(--space-3) !important;
    }

    .exam-sidebar .card {
        padding: var(--space-3) !important;
    }

    /* Smaller button text */
    .btn-sm {
        font-size: 0.75rem;
        padding: 6px 10px;
    }

    /* Upload zone: compact */
    .upload-zone {
        padding: var(--space-3) !important;
        min-height: auto !important;
    }

    .upload-zone-title {
        font-size: 0.875rem;
    }

    /* Import: P2 grid → 2 columns */
    .import-answers__p2-list {
        grid-template-columns: 1fr !important;
    }

    /* Variant code input row: stack */
    [style*="display: flex"][style*="align-items: center"][style*="gap"][style*="Mã đề"] {
        flex-wrap: wrap;
    }
}