/* ========================================
   MAZE LAB — Dracula Theme
   Matching alextong.me aesthetic
   ======================================== */

:root {
    /* Dracula palette */
    --bg: #0d1117;
    --bg-card: #1e1e2e;
    --current-line: #44475a;
    --selection: #44475a;
    --foreground: #f8f8f2;
    --comment: #6272a4;
    --red: #ff5555;
    --orange: #ffb86c;
    --yellow: #f1fa8c;
    --green: #50fa7b;
    --cyan: #8be9fd;
    --purple: #bd93f9;
    --pink: #ff79c6;

    /* Semantic */
    --border: #44475a;
    --border-hover: #6272a4;
    --text-dim: rgba(98, 114, 164, 0.6);

    /* Fonts — matching alextong.me */
    --font-sans: 'DM Sans', sans-serif;
    --font-mono: 'DM Mono', monospace;
}

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

html {
    background: var(--bg);
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--foreground);
    min-height: 100vh;
    overflow-x: hidden;
    padding: 2rem 1.5rem 3rem;
    max-width: 1400px;
    margin: 0 auto;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Grain overlay — matching alextong.me */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 256px 256px;
}

/* Bat canvas */
#bat-canvas {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 2;
}

/* All content above fog */
header, .controls, .legend, .grid, footer {
    position: relative;
    z-index: 10;
}

/* ---- HEADER ---- */
header {
    text-align: center;
    margin-bottom: 2.5rem;
    animation: fadeDown 0.6s ease-out both;
}

.header-top {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 0.25rem;
}

.header-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    color: var(--text-dim);
    text-transform: uppercase;
}

h1 {
    font-family: var(--font-sans);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--foreground);
    line-height: 1;
}

.bat-icon {
    vertical-align: middle;
    margin-left: 0.15em;
    color: var(--comment);
    transition: color 0.3s;
}

header:hover .bat-icon {
    color: var(--purple);
}

h1 .accent {
    color: var(--pink);
    text-shadow: 0 0 30px rgba(255, 121, 198, 0.3);
}

.subtitle {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--comment);
    margin-top: 0.5rem;
}

/* ---- CONTROLS ---- */
.controls {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
    padding: 1.25rem 1.5rem;
    background:
        radial-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
        var(--bg-card);
    background-size: 24px 24px, auto;
    border: 1px solid var(--border);
    border-radius: 16px;
    animation: fadeDown 0.6s 0.1s ease-out both;
}

.control-group {
    flex: 1;
    min-width: 200px;
    max-width: 400px;
}

.control-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--comment);
    display: block;
    margin-bottom: 0.6rem;
}

.slider-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.slider-value {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--purple);
    min-width: 3.5em;
    text-align: right;
    font-weight: 600;
}

.slider-bound {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-dim);
}

/* Custom range slider */
.slider {
    -webkit-appearance: none;
    appearance: none;
    flex: 1;
    height: 4px;
    background: var(--current-line);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
    direction: rtl;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--purple);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 12px rgba(189, 147, 249, 0.4);
    transition: box-shadow 0.2s, transform 0.2s;
}

.slider::-webkit-slider-thumb:hover {
    box-shadow: 0 0 20px rgba(189, 147, 249, 0.6);
    transform: scale(1.15);
}

.slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--purple);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 12px rgba(189, 147, 249, 0.4);
}

.control-buttons {
    display: flex;
    gap: 0.75rem;
}

button {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.7rem 1.5rem;
    border: 1px solid var(--purple);
    border-radius: 8px;
    background: var(--purple);
    color: var(--bg);
    cursor: pointer;
    transition: all 0.25s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
    box-shadow: 0 0 16px rgba(189, 147, 249, 0.2);
}

button:hover {
    background: var(--purple);
    color: var(--bg);
    box-shadow: 0 0 32px rgba(189, 147, 249, 0.4);
    transform: translateY(-1px);
}

button:active {
    transform: translateY(0);
}

button svg {
    flex-shrink: 0;
}

/* ---- LEGEND ---- */
.legend {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
    animation: fadeDown 0.6s 0.15s ease-out both;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--comment);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.legend-swatch {
    width: 10px;
    height: 10px;
    border-radius: 2px;
    flex-shrink: 0;
}

.legend-circle {
    border-radius: 50%;
    box-shadow: 0 0 6px rgba(255, 121, 198, 0.6);
}

.legend-diamond {
    transform: rotate(45deg);
    border-radius: 1px;
    box-shadow: 0 0 6px rgba(80, 250, 123, 0.6);
}

/* ---- MAIN GRID ---- */
.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
    margin-bottom: 3rem;
}

/* ---- CARD ---- */
.card {
    position: relative;
    background:
        radial-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
        var(--bg-card);
    background-size: 24px 24px, auto;
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 1.25rem;
    transition: border-color 0.3s, box-shadow 0.3s;
    animation: fadeUp 0.5s calc(var(--delay) * 0.12s + 0.2s) ease-out both;
}

.card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, var(--purple), var(--pink));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.card:hover::before {
    opacity: 1;
}

.card:hover {
    border-color: transparent;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15), 0 8px 32px rgba(0, 0, 0, 0.1);
}

.card.winner {
    border-color: transparent;
    box-shadow: 0 0 20px rgba(80, 250, 123, 0.15);
}

.card.winner::before {
    opacity: 1;
    background: linear-gradient(135deg, var(--green), var(--cyan));
}

.card.winner .card-badge {
    color: var(--green);
    background: rgba(80, 250, 123, 0.1);
    border-color: rgba(80, 250, 123, 0.25);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.card-badge {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 500;
    color: var(--pink);
    background: rgba(255, 121, 198, 0.1);
    border: 1px solid rgba(255, 121, 198, 0.2);
    border-radius: 6px;
    padding: 0.3rem 0.5rem;
    line-height: 1;
}

h2 {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    color: var(--foreground);
    line-height: 1.2;
}

.card-tag {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    color: var(--comment);
    text-transform: uppercase;
}

/* Canvas wrapper with corner accents */
.canvas-wrap {
    position: relative;
    background: #282a36;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 0.75rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

.canvas-wrap canvas {
    display: block;
    width: 100%;
    height: auto;
}


/* Stats */
.stats {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.stat {
    flex: 1;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.5rem 0.6rem;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.stat-label {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-dim);
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--comment);
    transition: color 0.4s, text-shadow 0.4s;
}

.stats.solved .stat-value {
    color: var(--green);
    text-shadow: 0 0 20px rgba(80, 250, 123, 0.2);
}

.card-desc {
    font-size: 0.8rem;
    line-height: 1.55;
    color: var(--comment);
}

/* ---- FOOTER ---- */
footer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
    padding-top: 1rem;
}

.footer-line {
    flex: 1;
    max-width: 120px;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border), transparent);
}

.footer-link {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--comment);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-link:hover {
    color: var(--purple);
}

/* ---- FOG ---- */
.fog-wrapper {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    filter: blur(2px) saturate(1.3) hue-rotate(220deg) brightness(1.1);
}

.fog-layer {
    position: absolute;
    top: 0;
    height: 100%;
    width: 200%;
    will-change: left, opacity;
    transform: translateZ(0);
}

.fog-img {
    float: left;
    height: 100%;
    width: 50%;
    -webkit-mask-image: linear-gradient(to right, transparent 0%, black 20%, black 80%, transparent 100%);
    mask-image: linear-gradient(to right, transparent 0%, black 20%, black 80%, transparent 100%);
}

.fog-layer-1 {
    animation:
        fog-opacity-1 30s linear infinite,
        fog-drift 60s linear infinite;
}
.fog-1 {
    background: url("fog1.png") center center / cover no-repeat transparent;
}

.fog-layer-2 {
    animation:
        fog-opacity-2 42s linear infinite,
        fog-drift 45s linear infinite;
}
.fog-2 {
    background: url("fog2.png") center center / cover no-repeat transparent;
}

.fog-layer-3 {
    animation:
        fog-opacity-3 36s linear infinite,
        fog-drift 35s linear infinite;
}

@keyframes fog-drift {
    0% { left: 0; }
    100% { left: -100%; }
}

@keyframes fog-opacity-1 {
    0% { opacity: 0.35; }
    22% { opacity: 0.6; }
    40% { opacity: 0.4; }
    58% { opacity: 0.55; }
    80% { opacity: 0.35; }
    100% { opacity: 0.35; }
}

@keyframes fog-opacity-2 {
    0% { opacity: 0.45; }
    25% { opacity: 0.25; }
    50% { opacity: 0.2; }
    80% { opacity: 0.4; }
    100% { opacity: 0.45; }
}

@keyframes fog-opacity-3 {
    0% { opacity: 0.35; }
    27% { opacity: 0.2; }
    52% { opacity: 0.3; }
    68% { opacity: 0.2; }
    100% { opacity: 0.35; }
}

/* ---- ANIMATIONS ---- */
@keyframes fadeDown {
    from { opacity: 0; transform: translateY(-12px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ---- RESPONSIVE ---- */
@media (max-width: 1100px) {
    .grid {
        grid-template-columns: 1fr 1fr;
    }
    .card:last-child {
        grid-column: 1 / -1;
        max-width: 50%;
        justify-self: center;
    }
}

@media (max-width: 700px) {
    body {
        padding: 1.25rem 0.75rem 2rem;
    }

    header {
        margin-bottom: 1.5rem;
    }

    .grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .card:last-child {
        max-width: 100%;
    }

    .card {
        padding: 1rem;
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
        padding: 1rem;
        gap: 1rem;
    }

    .control-group {
        max-width: 100%;
    }

    .control-buttons {
        justify-content: center;
    }

    button {
        font-size: 0.75rem;
        padding: 0.85rem 1.75rem;
        width: 100%;
        justify-content: center;
    }

    .slider::-webkit-slider-thumb {
        width: 24px;
        height: 24px;
    }

    .slider::-moz-range-thumb {
        width: 24px;
        height: 24px;
    }

    .legend {
        gap: 0.6rem 1rem;
    }

    .stats {
        gap: 0.5rem;
    }

    .stat-value {
        font-size: 0.85rem;
    }

    h1 {
        letter-spacing: 0.04em;
    }
}

@media (max-width: 420px) {
    body {
        padding: 1rem 0.5rem 1.5rem;
    }

    h1 {
        letter-spacing: 0.02em;
    }

    .header-top {
        gap: 0.75rem;
    }

    .header-label {
        display: none;
    }

    .subtitle {
        font-size: 0.6rem;
        letter-spacing: 0.2em;
    }

    .legend {
        gap: 0.5rem 0.75rem;
    }

    .legend-item {
        font-size: 0.6rem;
    }

    .card-header {
        margin-bottom: 0.75rem;
    }

    h2 {
        font-size: 0.8rem;
    }

    .card-desc {
        font-size: 0.7rem;
    }
}