/* codex: 2026-07-22 Float Shan-Yu choices above the visible green and red cut triangles. */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Outfit:wght@500;600;700;800&display=swap');

:root {
    --bg-dark: #090d16;
    --bg-card: rgba(18, 26, 44, 0.75);
    --border-glass: rgba(255, 255, 255, 0.12);
    --accent-cyan: #00f3ff;
    --accent-blue: #38bdf8;
    --accent-gold: #ffb703;
    --accent-crimson: #ff2e93;
    --accent-emerald: #10b981;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --radius-lg: 16px;
    --radius-md: 10px;
    --shadow-glow: 0 0 20px rgba(0, 243, 255, 0.15);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Prevent horizontal page shift & scrollbar bugs */
html, body {
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden !important;
    position: relative;
    background-color: var(--bg-dark);
    background-image: 
        radial-gradient(circle at 15% 20%, rgba(0, 243, 255, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 85% 80%, rgba(255, 46, 147, 0.08) 0%, transparent 40%);
    color: var(--text-primary);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Math Typography Style */
.math-sym {
    font-family: 'Cambria Math', 'Times New Roman', STIXTwoText, Georgia, serif;
    font-style: italic;
    font-weight: 600;
    color: var(--accent-cyan);
    padding: 0 2px;
}

sub, sup {
    font-style: normal;
    font-size: 0.78em;
}

code {
    font-family: 'Fira Code', 'Courier New', monospace;
    background: rgba(0, 243, 255, 0.1);
    color: var(--accent-cyan);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
}

/* Glassmorphism Panel */
.glass-panel {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
}

/* Header Navbar */
.navbar {
    width: 100%;
    max-width: 100%;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-glass);
    background: rgba(9, 13, 22, 0.85);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    flex-wrap: wrap;
    gap: 12px;
}

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

.brand-icon {
    font-size: 28px;
}

.brand-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-cyan), #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-sub {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Mode Tabs */
.mode-tabs {
    display: flex;
    gap: 8px;
    background: rgba(255, 255, 255, 0.05);
    padding: 4px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-glass);
    flex-wrap: wrap;
    max-width: 100%;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--accent-cyan);
    color: #090d16;
    box-shadow: 0 0 12px rgba(0, 243, 255, 0.4);
}

/* Size Selector in Navbar */
.size-selector {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.05);
    padding: 4px 8px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-glass);
}

/* Size Classes Override */
body.zoom-small .canvas-container {
    height: min(45vh, 380px);
    min-height: 300px;
}
body.zoom-small {
    font-size: 13.5px;
}

body.zoom-medium .canvas-container {
    height: min(60vh, 520px);
    min-height: 400px;
}
body.zoom-medium {
    font-size: 15px;
}

body.zoom-large .canvas-container {
    height: min(72vh, 680px);
    min-height: 480px;
}
body.zoom-large {
    font-size: 17px;
}

body.zoom-xlarge .canvas-container {
    height: min(82vh, 840px);
    min-height: 560px;
}
body.zoom-xlarge {
    font-size: 19px;
}

/* Main Layout Grid */
.main-container {
    display: grid;
    grid-template-columns: minmax(280px, 340px) 1fr minmax(300px, 360px);
    gap: 24px;
    padding: 24px;
    max-width: 2560px;
    width: 100%;
    margin: 0 auto;
    flex: 1;
    overflow-x: hidden;
}

/* Demo Grid Layout for Tab 4 */
.demo-grid {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    width: 100%;
}

/* Control Panel Sidebar */
.control-sidebar {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.section-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-cyan);
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.label-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.92rem;
    color: var(--text-secondary);
}

.range-slider {
    width: 100%;
    accent-color: var(--accent-cyan);
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    cursor: pointer;
}

.preset-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.btn-chip {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.btn-chip:hover {
    border-color: var(--accent-cyan);
    color: var(--text-primary);
}

.btn-chip.active {
    background: rgba(0, 243, 255, 0.15);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

/* Canvas Viewport */
.viewport-panel {
    padding: 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.canvas-header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    flex-wrap: wrap;
    gap: 10px;
}

.status-badge {
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.status-win {
    background: rgba(255, 183, 3, 0.2);
    border: 1px solid var(--accent-gold);
    color: var(--accent-gold);
    box-shadow: 0 0 16px rgba(255, 183, 3, 0.3);
}

.status-ongoing {
    background: rgba(56, 189, 248, 0.15);
    border: 1px solid var(--accent-blue);
    color: var(--accent-blue);
}

/* Canvas Container with strict gesture & drag locking */
.canvas-container {
    width: 100%;
    position: relative;
    border-radius: 14px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px dashed rgba(255, 255, 255, 0.12);
    overflow: hidden;
    touch-action: none !important;
    user-select: none !important;
    -webkit-user-drag: none !important;
}

.cut-keyboard-hint {
    width: fit-content;
    max-width: calc(100% - 8px);
    margin: 0 auto 8px;
    padding: 7px 12px;
    border: 1px solid rgba(0, 243, 255, 0.45);
    border-radius: 9px;
    background: rgba(9, 19, 36, 0.86);
    color: var(--text-primary);
    font-size: 0.78rem;
    font-weight: 700;
    line-height: 1.45;
    text-align: center;
    pointer-events: none;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
}

.cut-keyboard-hint small {
    display: block;
    color: var(--text-secondary);
    font-size: 0.71rem;
    font-weight: 500;
}

.cut-keyboard-hint.is-active {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

#geo-canvas, #demo-canvas {
    width: 100%;
    height: 100%;
    display: block;
    cursor: crosshair;
    touch-action: none !important;
    user-select: none !important;
    -webkit-user-drag: none !important;
}

/* Action Floating Bar */
.action-bar {
    margin-top: 18px;
    display: flex;
    gap: 14px;
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 11px 22px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-cyan), #0284c7);
    color: #090d16;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 243, 255, 0.35);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    border: 1px solid var(--border-glass);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

/* Shan-Yu Choice Overlay */
.choice-overlay {
    position: absolute;
    top: 16px;
    left: 50%;
    transform: translateX(-50%);
    width: min(94%, 720px);
    height: auto;
    background: transparent;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding: 0;
    z-index: 50;
    pointer-events: none;
}

.choice-overlay > h2,
.choice-overlay > p {
    background: rgba(9, 13, 22, 0.88);
    backdrop-filter: blur(8px);
    border-radius: 8px;
    padding: 5px 12px;
}

.choice-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 10px;
    width: 100%;
    max-width: 600px;
}

.choice-card {
    background: var(--bg-card);
    border: 2px solid var(--border-glass);
    border-radius: 12px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.25 ease;
    text-align: center;
    pointer-events: auto;
}

.choice-card:hover {
    border-color: var(--accent-cyan);
    transform: scale(1.03);
    box-shadow: 0 0 20px rgba(0, 243, 255, 0.25);
}

.choice-card-green {
    background: rgba(16, 185, 129, 0.24);
    border-color: var(--accent-emerald);
}

.choice-card-green h3 { color: var(--accent-emerald); }

.choice-card-red {
    background: rgba(239, 68, 68, 0.24);
    border-color: #ef4444;
}

.choice-card-red h3 { color: #f87171; }

.choice-card-green:hover {
    border-color: #6ee7b7;
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.4);
}

.choice-card-red:hover {
    border-color: #fca5a5;
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.4);
}

/* Info Sidebar */
.info-sidebar {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 420px;
    overflow-y: auto;
}

.history-item {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-glass);
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 0.88rem;
}

.win-dialog {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 24px;
    background: rgba(3, 8, 18, 0.72);
    backdrop-filter: blur(8px);
}

.win-dialog-card {
    width: min(92vw, 440px);
    padding: 30px;
    text-align: center;
    border: 1px solid var(--accent-gold);
    border-radius: var(--radius-lg);
    background: rgba(18, 26, 44, 0.97);
    box-shadow: 0 0 35px rgba(255, 183, 3, 0.35);
}

.win-dialog-icon { font-size: 3rem; margin-bottom: 8px; }
.win-dialog-card h2 { color: var(--accent-gold); font-family: 'Outfit', sans-serif; }
.win-dialog-card p { color: var(--text-secondary); line-height: 1.6; margin: 12px 0 22px; }
.win-dialog-actions { display: flex; justify-content: center; gap: 12px; }

.tip-box {
    background: rgba(56, 189, 248, 0.12);
    border-left: 4px solid var(--accent-blue);
    padding: 12px;
    border-radius: 4px;
    margin-top: 10px;
    font-size: 0.9rem;
}

.warn-box {
    background: rgba(255, 46, 147, 0.12);
    border-left: 4px solid var(--accent-crimson);
    padding: 12px;
    border-radius: 4px;
    margin-top: 10px;
    font-size: 0.9rem;
}

.highlight-safe { color: var(--accent-blue); }
.highlight-unsafe { color: var(--accent-crimson); }

/* RESPONSIVE MEDIA QUERIES */

/* Tablet & Pad (768px - 1180px) */
@media (max-width: 1180px) {
    .main-container {
        grid-template-columns: 300px 1fr;
    }
    .info-sidebar {
        grid-column: 1 / -1;
    }
    .demo-grid {
        grid-template-columns: 1fr;
    }
}

/* Mobile (< 768px) */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
        padding: 14px 18px;
    }
    .mode-tabs {
        width: 100%;
        overflow-x: auto;
        justify-content: flex-start;
    }
    .tab-btn {
        padding: 7px 14px;
        font-size: 0.85rem;
        white-space: nowrap;
    }
    .main-container {
        grid-template-columns: 1fr;
        padding: 14px;
        gap: 16px;
    }
    .choice-cards {
        grid-template-columns: 1fr;
    }
    .btn {
        width: 100%;
        justify-content: center;
    }
}