/* ══════════════════════════════════════════════════════════════
   SAT INFINITE — SOHAMXYZ THEME V4
   Matching sohamxyz.com color palette & design language
   ══════════════════════════════════════════════════════════════ */

:root {
    --bg:           #0a0a0f;
    --bg-2:         #0f0f1a;
    --bg-3:         #13131f;
    --surface:      rgba(255, 255, 255, 0.04);
    --surface-2:    rgba(255, 255, 255, 0.07);
    --border:       rgba(255, 255, 255, 0.08);
    --border-2:     rgba(255, 255, 255, 0.14);
    --text:         #f0f0f5;
    --text-2:       #9b9bb5;
    --text-3:       #6b6b85;
    --accent:       #7c6efc;
    --accent-2:     #a78bfa;
    --accent-glow:  rgba(124, 110, 252, 0.35);
    --accent-subtle: rgba(124, 110, 252, 0.12);
    --red:          #ff4500;
    --red-2:        #ff6b35;
    --red-glow:     rgba(255, 69, 0, 0.25);
    --green:        #22c55e;
    --green-glow:   rgba(34, 197, 94, 0.25);
    --gold:         #f59e0b;
    --gold-glow:    rgba(245, 158, 11, 0.25);

    --radius-sm:    8px;
    --radius-md:    12px;
    --radius-lg:    18px;
    --radius-pill:  100px;

    --font:         'Inter', system-ui, -apple-system, sans-serif;
    --reading:      'Newsreader', Georgia, serif;
    --mono:         'JetBrains Mono', monospace;
    --transition:   cubic-bezier(0.23, 1, 0.32, 1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: var(--font);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

/* Base Visibility Rules */
@media (min-width: 769px) {
    .mobile-only {
        display: none !important;
    }
}

@media (max-width: 768px) {
    .desktop-only {
        display: none !important;
    }
}

/* ========================================================= */
/* DESKTOP LAYOUT (> 768px)                                  */
/* ========================================================= */

.app-layout {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-height: 100vh;
    overflow: hidden;
    background: var(--bg);
}

/* Desktop Header */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 28px;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    gap: 16px;
    z-index: 10;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 24px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    user-select: none;
}

.brand-icon {
    font-size: 22px;
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-name {
    font-weight: 800;
    font-size: 16px;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 50%, #c4b5fd 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-sub {
    font-size: 11px;
    color: var(--text-2);
    font-weight: 500;
}

/* Subject Pills */
.subject-pills {
    display: flex;
    background: var(--surface);
    padding: 4px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.pill {
    background: transparent;
    border: none;
    color: var(--text-2);
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s var(--transition);
}

.pill:hover {
    color: var(--text);
    background: var(--surface-2);
}

.pill.active {
    background: var(--accent);
    color: #fff;
    font-weight: 600;
    box-shadow: 0 2px 10px var(--accent-glow);
}

/* Stats HUD */
.header-stats {
    display: flex;
    align-items: center;
    gap: 10px;
}

.stat-box {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    transition: border 0.2s;
}

.stat-box:hover {
    border-color: var(--border-2);
}

.stat-val {
    font-family: var(--mono);
    font-weight: 700;
    color: var(--text);
}

.stat-lbl {
    font-size: 11px;
    color: var(--text-3);
    margin-left: 2px;
}

.streak-box .stat-val {
    color: var(--red-2);
}

.icon-btn {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s var(--transition);
}

.icon-btn:hover {
    background: var(--surface-2);
    border-color: var(--border-2);
}

.icon-btn .badge, .mobile-icon-btn .badge {
    background: var(--accent);
    color: #fff;
    border-radius: 10px;
    padding: 1px 6px;
    font-size: 11px;
    font-weight: 600;
    box-shadow: 0 0 10px var(--accent-glow);
}

/* Desktop Filter Sub-bar */
.filter-bar {
    display: flex;
    align-items: center;
    padding: 8px 28px;
    background: var(--bg-2);
    border-bottom: 1px solid var(--border);
    gap: 20px;
    font-size: 13px;
    flex-wrap: wrap;
    flex-shrink: 0;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-2);
}

.filter-group select {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 5px 10px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    outline: none;
    cursor: pointer;
    transition: border 0.2s;
}

.filter-group select:focus {
    border-color: var(--accent);
}

/* Toggle Switch */
.switch-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
}

.switch-label input {
    display: none;
}

.slider {
    width: 32px;
    height: 18px;
    background-color: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 18px;
    position: relative;
    transition: 0.2s;
}

.slider:before {
    content: "";
    position: absolute;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--text-3);
    top: 2px;
    left: 2px;
    transition: 0.2s;
}

input:checked + .slider {
    background-color: var(--accent);
    border-color: var(--accent);
    box-shadow: 0 0 10px var(--accent-glow);
}

input:checked + .slider:before {
    transform: translateX(14px);
    background-color: white;
}

.switch-text {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-2);
}

.stats-summary {
    margin-left: auto;
    font-size: 12px;
    color: var(--text-3);
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--mono);
}

.dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--green);
    box-shadow: 0 0 8px var(--green-glow);
}

/* Main Quiz Container */
.quiz-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

.state-view {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    color: var(--text-2);
    padding: 24px;
    text-align: center;
}

.spinner {
    width: 38px;
    height: 38px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    box-shadow: 0 0 16px var(--accent-glow);
}

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

.error-icon {
    font-size: 40px;
}

/* Question View */
.question-view {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

/* Meta Bar */
.question-meta-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 28px;
    background: rgba(15, 15, 26, 0.6);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.meta-tags {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.badge {
    font-size: 12px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    border: 1px solid transparent;
}

.badge-subject {
    background: var(--accent-subtle);
    color: var(--accent-2);
    border-color: rgba(124, 110, 252, 0.3);
}

.badge-domain {
    background: var(--surface);
    color: var(--text-2);
    border-color: var(--border);
}

.badge-skill {
    background: var(--surface);
    color: var(--text-3);
    border-color: var(--border);
}

.badge-difficulty.easy {
    background: rgba(34, 197, 94, 0.12);
    color: var(--green);
    border-color: rgba(34, 197, 94, 0.25);
}

.badge-difficulty.medium {
    background: rgba(245, 158, 11, 0.12);
    color: var(--gold);
    border-color: rgba(245, 158, 11, 0.25);
}

.badge-difficulty.hard {
    background: rgba(255, 69, 0, 0.12);
    color: var(--red-2);
    border-color: rgba(255, 69, 0, 0.25);
}

.badge-practice {
    background: rgba(255, 107, 53, 0.12);
    color: var(--red-2);
    border-color: rgba(255, 107, 53, 0.25);
}

.meta-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.question-id {
    font-family: var(--mono);
    font-size: 12px;
    color: var(--text-3);
}

.icon-btn-small {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-2);
    border-radius: var(--radius-sm);
    padding: 4px 8px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s var(--transition);
}

.icon-btn-small:hover {
    color: var(--text);
    background: var(--surface-2);
    border-color: var(--border-2);
}

.icon-btn-small.active {
    color: var(--gold);
    border-color: var(--gold);
}

/* Question Grid (Split Panels Desktop) */
.question-grid {
    flex: 1;
    display: flex;
    overflow: hidden;
}

/* Stimulus Panel (Passage) */
.stimulus-panel {
    flex: 1;
    max-width: 50%;
    border-right: 1px solid var(--border);
    background: var(--bg-2);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.stimulus-panel.hidden {
    display: none !important;
}

.panel-header {
    padding: 12px 28px;
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    font-family: var(--mono);
}

.stimulus-content {
    flex: 1;
    padding: 32px;
    overflow-y: auto;
    font-family: var(--reading);
    font-size: 18px;
    line-height: 1.8;
    color: #e4e4ed;
}

.stimulus-content p {
    margin-bottom: 1.3em;
}

.stimulus-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5em 0;
    font-family: var(--font);
    font-size: 14px;
}

.stimulus-content th, .stimulus-content td {
    border: 1px solid var(--border);
    padding: 8px 12px;
    text-align: left;
}

.stimulus-content th {
    background: var(--surface);
    font-weight: 600;
}

.stimulus-content img, .stem-content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 16px auto;
    border-radius: var(--radius-sm);
    background: #fff;
    padding: 8px;
}

.stimulus-content svg, .stem-content svg {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 16px auto;
    background: #fff;
    padding: 8px;
    border-radius: var(--radius-sm);
}

/* Prompt Panel */
.prompt-panel {
    flex: 1;
    padding: 32px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.question-grid:not(.has-stimulus) .prompt-panel {
    max-width: 820px;
    margin: 0 auto;
    width: 100%;
}

.stem-content {
    font-size: 16.5px;
    line-height: 1.65;
    color: var(--text);
    font-weight: 500;
}

.stem-content p {
    margin-bottom: 0.8em;
}

/* Options Container */
.options-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option-card {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 16px 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s var(--transition);
    user-select: none;
    position: relative;
}

.option-card:hover:not(.submitted) {
    border-color: var(--accent);
    background: var(--surface-2);
    box-shadow: 0 0 20px var(--accent-subtle);
    transform: translateY(-1px);
}

.option-letter {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--surface-2);
    border: 1px solid var(--border);
    font-family: var(--mono);
    font-weight: 700;
    font-size: 13px;
    color: var(--text-2);
    flex-shrink: 0;
    transition: all 0.2s var(--transition);
}

.option-card:hover .option-letter {
    border-color: var(--accent);
    color: var(--accent-2);
}

.option-card.selected {
    border-color: var(--accent);
    background: var(--accent-subtle);
    box-shadow: 0 0 24px var(--accent-glow);
}

.option-card.selected .option-letter {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    box-shadow: 0 0 10px var(--accent-glow);
}

.option-body {
    flex: 1;
    font-size: 15px;
    line-height: 1.55;
    color: #e4e4ed;
    padding-top: 3px;
}

.option-body p {
    margin-bottom: 0.3em;
}

.option-body p:last-child {
    margin-bottom: 0;
}

/* Options Submitted States */
.option-card.correct {
    border-color: var(--green) !important;
    background: rgba(34, 197, 94, 0.12) !important;
    box-shadow: 0 0 20px var(--green-glow) !important;
}

.option-card.correct .option-letter {
    background: var(--green) !important;
    border-color: var(--green) !important;
    color: #fff !important;
    box-shadow: 0 0 10px var(--green-glow) !important;
}

.option-card.wrong {
    border-color: var(--red) !important;
    background: rgba(255, 69, 0, 0.12) !important;
    box-shadow: 0 0 20px var(--red-glow) !important;
}

.option-card.wrong .option-letter {
    background: var(--red) !important;
    border-color: var(--red) !important;
    color: #fff !important;
    box-shadow: 0 0 10px var(--red-glow) !important;
}

.option-status-badge {
    font-size: 12px;
    font-weight: 700;
    padding: 3px 9px;
    border-radius: var(--radius-sm);
    align-self: center;
    margin-left: auto;
}

.option-card.correct .option-status-badge {
    background: var(--green);
    color: #fff;
}

.option-card.wrong .option-status-badge {
    background: var(--red);
    color: #fff;
}

/* SPR (Math Grid-in) Container */
.spr-container {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 22px;
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.spr-label {
    font-size: 14px;
    color: var(--text-2);
    font-weight: 500;
}

.spr-input-group {
    display: flex;
    gap: 12px;
}

.spr-input-group input {
    flex: 1;
    background: var(--bg-2);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-family: var(--mono);
    font-size: 16px;
    outline: none;
    transition: border 0.2s, box-shadow 0.2s;
}

.spr-input-group input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 16px var(--accent-glow);
}

.spr-feedback {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
}

.spr-feedback.correct {
    background: rgba(34, 197, 94, 0.12);
    color: var(--green);
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.spr-feedback.wrong {
    background: rgba(255, 69, 0, 0.12);
    color: var(--red-2);
    border: 1px solid rgba(255, 69, 0, 0.3);
}

/* Rationale Explanation Card */
.rationale-card {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-top: 10px;
}

.rationale-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    user-select: none;
}

.rationale-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 14px;
    color: var(--text);
}

.rationale-badge {
    font-size: 12px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 10px;
}

.rationale-badge.correct {
    background: var(--green);
    color: #fff;
    box-shadow: 0 0 10px var(--green-glow);
}

.rationale-badge.wrong {
    background: var(--red);
    color: #fff;
    box-shadow: 0 0 10px var(--red-glow);
}

.rationale-body {
    padding: 20px 24px;
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-2);
}

.rationale-body p {
    margin-bottom: 1em;
}

.rationale-body p:last-child {
    margin-bottom: 0;
}

/* Desktop Footer / Actions */
.quiz-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 28px;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}

.shortcut-tip {
    font-size: 12px;
    color: var(--text-3);
    font-family: var(--mono);
}

kbd {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 2px 6px;
    font-family: var(--mono);
    font-size: 11px;
    color: var(--text-2);
    margin: 0 2px;
}

.footer-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Buttons */
.btn {
    padding: 9px 20px;
    border-radius: 10px;
    font-size: 13.5px;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.2s var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 4px 18px var(--accent-glow);
}

.btn-primary:hover:not(:disabled) {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: 0 6px 24px rgba(124, 110, 252, 0.5);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text-2);
    border-color: var(--border);
}

.btn-secondary:hover {
    color: var(--text);
    background: var(--surface-2);
    border-color: var(--border-2);
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none !important;
}

/* Bookmarks Modal */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    padding: 16px;
}

.modal-card {
    background: var(--bg-2);
    border: 1px solid var(--border-2);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 560px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    border-bottom: 1px solid var(--border);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.empty-state {
    color: var(--text-3);
    font-size: 14px;
    text-align: center;
    padding: 24px 0;
}

.bookmark-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s var(--transition);
}

.bookmark-item:hover {
    border-color: var(--accent);
    background: var(--surface-2);
    transform: translateY(-1px);
}

.bookmark-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.bookmark-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
}

.bookmark-meta {
    font-size: 11px;
    color: var(--text-3);
    font-family: var(--mono);
}

/* Utilities */
.hidden {
    display: none !important;
}

/* ========================================================= */
/* MOBILE OVERHAUL (Screens <= 768px)                        */
/* ========================================================= */

@media (max-width: 768px) {
    body {
        overflow-x: hidden;
        background-color: var(--bg);
    }

    .app-layout {
        height: auto;
        min-height: 100vh;
        max-height: none;
        overflow: visible;
        display: block;
    }

    /* Ultra-compact Mobile Top Bar */
    .mobile-top-bar {
        position: sticky;
        top: 0;
        z-index: 80;
        height: 46px;
        background: rgba(10, 10, 15, 0.88);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--border);
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0 14px;
    }

    .mobile-stats {
        display: flex;
        align-items: center;
        gap: 8px;
    }

    .mobile-chip {
        font-size: 12px;
        background: var(--surface);
        border: 1px solid var(--border);
        padding: 3px 8px;
        border-radius: 12px;
        font-family: var(--mono);
        color: var(--text);
    }

    .streak-chip strong {
        color: var(--red-2);
    }

    .mobile-subject-pill {
        font-size: 12px;
        font-weight: 700;
        color: var(--accent-2);
        background: var(--accent-subtle);
        padding: 3px 12px;
        border-radius: 12px;
        border: 1px solid rgba(124, 110, 252, 0.3);
    }

    .mobile-actions {
        display: flex;
        align-items: center;
        gap: 8px;
    }

    .mobile-icon-btn {
        background: var(--surface);
        border: 1px solid var(--border);
        color: var(--text);
        width: 32px;
        height: 32px;
        border-radius: var(--radius-sm);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 14px;
        position: relative;
        cursor: pointer;
    }

    .mobile-icon-btn .badge {
        position: absolute;
        top: -4px;
        right: -4px;
        font-size: 10px;
        padding: 1px 4px;
    }

    /* Quiz Flow on Mobile */
    .quiz-container {
        height: auto;
        min-height: calc(100vh - 46px);
        overflow: visible;
        padding-bottom: 100px;
    }

    .question-view {
        height: auto;
        overflow: visible;
        display: block;
    }

    .question-meta-bar {
        padding: 10px 14px;
        background: transparent;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    .meta-tags {
        gap: 6px;
    }

    .badge {
        font-size: 11px;
        padding: 2px 8px;
    }

    /* Single-column presentation */
    .question-grid {
        display: flex;
        flex-direction: column;
        overflow: visible;
        height: auto;
    }

    .stimulus-panel {
        max-width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border);
        background: var(--bg-2);
        overflow: visible;
        height: auto;
        max-height: none;
    }

    .panel-header {
        padding: 8px 14px;
        font-size: 11px;
    }

    .stimulus-content {
        padding: 18px 16px;
        font-size: 16px;
        line-height: 1.7;
        overflow: visible;
    }

    .prompt-panel {
        padding: 18px 16px;
        gap: 18px;
        max-width: 100%;
        margin: 0;
        overflow: visible;
    }

    .stem-content {
        font-size: 15.5px;
        line-height: 1.6;
    }

    .options-container {
        gap: 10px;
    }

    .option-card {
        padding: 14px 16px;
        border-radius: var(--radius-md);
        gap: 12px;
        min-height: 52px;
    }

    .option-letter {
        width: 30px;
        height: 30px;
        font-size: 14px;
    }

    .option-body {
        font-size: 15px;
    }

    .spr-container {
        padding: 16px 14px;
    }

    .spr-input-group input {
        font-size: 16px;
        padding: 12px;
    }

    .rationale-card {
        margin-top: 14px;
    }

    .rationale-header {
        padding: 12px 14px;
    }

    .rationale-body {
        padding: 16px 14px;
        font-size: 13.5px;
    }

    /* Fixed Bottom Taskbar */
    .mobile-taskbar {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 100;
        height: calc(64px + env(safe-area-inset-bottom, 0px));
        padding: 8px 14px calc(8px + env(safe-area-inset-bottom, 0px)) 14px;
        background: rgba(10, 10, 15, 0.90);
        backdrop-filter: blur(24px);
        -webkit-backdrop-filter: blur(24px);
        border-top: 1px solid var(--border);
        display: flex;
        align-items: center;
        gap: 10px;
        box-shadow: 0 -8px 24px rgba(0, 0, 0, 0.5);
    }

    .btn-mobile-action {
        flex: 1;
        height: 48px;
        font-size: 15px;
        font-weight: 700;
        border-radius: 12px;
        display: flex;
        align-items: center;
        justify-content: center;
        letter-spacing: 0.2px;
        background: var(--accent);
        box-shadow: 0 4px 20px var(--accent-glow);
    }

    .mobile-taskbar-btn {
        background: var(--surface);
        border: 1px solid var(--border);
        color: var(--text-2);
        height: 48px;
        width: 52px;
        border-radius: 12px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2px;
        cursor: pointer;
        flex-shrink: 0;
        transition: all 0.15s;
    }

    .mobile-taskbar-btn:active {
        background: var(--surface-2);
        transform: scale(0.96);
    }

    .mobile-taskbar-btn.active {
        color: var(--gold);
        border-color: var(--gold);
    }

    .mobile-taskbar-btn .btn-icon {
        font-size: 16px;
        line-height: 1;
    }

    .mobile-taskbar-btn .btn-label {
        font-size: 10px;
        font-weight: 600;
        font-family: var(--mono);
    }

    /* Slide-Up Mobile Filter Drawer */
    .drawer-backdrop {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.7);
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
        z-index: 150;
        display: flex;
        align-items: flex-end;
    }

    .drawer-sheet {
        background: var(--bg-2);
        border-top: 1px solid var(--border-2);
        border-radius: 20px 20px 0 0;
        width: 100%;
        max-height: 85vh;
        overflow-y: auto;
        display: flex;
        flex-direction: column;
        padding-bottom: calc(20px + env(safe-area-inset-bottom, 0px));
        box-shadow: 0 -12px 40px rgba(0, 0, 0, 0.6);
        animation: slideUp 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }

    @keyframes slideUp {
        from { transform: translateY(100%); }
        to { transform: translateY(0); }
    }

    .drawer-pull-bar {
        width: 36px;
        height: 4px;
        background: var(--border-2);
        border-radius: 4px;
        margin: 10px auto 4px auto;
    }

    .drawer-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 14px 20px;
        border-bottom: 1px solid var(--border);
    }

    .drawer-body {
        padding: 20px;
        display: flex;
        flex-direction: column;
        gap: 16px;
    }

    .drawer-field {
        display: flex;
        flex-direction: column;
        gap: 8px;
    }

    .drawer-label {
        font-size: 13px;
        font-weight: 600;
        color: var(--text-2);
    }

    .mobile-pills {
        display: grid;
        grid-template-columns: 1fr 1.5fr 1fr;
        gap: 4px;
    }

    .mobile-pills .pill {
        padding: 8px 4px;
        font-size: 12px;
        text-align: center;
    }

    .drawer-select {
        background: var(--surface);
        border: 1px solid var(--border);
        color: var(--text);
        padding: 10px 12px;
        border-radius: var(--radius-sm);
        font-size: 14px;
        outline: none;
        width: 100%;
    }

    .drawer-btn-apply {
        margin-top: 8px;
        height: 48px;
        font-size: 15px;
    }
}