:root {
    --bg: #0f0f12;
    --panel: #17171c;
    --text: #eaeaf2;
    --muted: #b6b6c2;
    --accent: #00e5ff;
    /* neon cyan */
    --accent-2: #ff00aa;
    /* neon magenta */
    --danger: #f87171;
    --ok: #34d399;
    --warn: #fbbf24;
    --tile: #1e1e25;
    --tile-border: #2a2a35;
    --tile-size: clamp(90px, 16vw, 160px);
    --accent-rgb: 0, 229, 255;
    --tile-min-h: 54px;
    --tile-locked-bg: #12281f;
    --tile-locked-border: #1f3a2a;
    --tile-solved-bg: #0f172a;
    --tile-solved-border: #1f2a46;
}

/* Light theme */
:root.theme-light {
    --bg: #f7f8fc;
    --panel: #ffffff;
    --text: #0f172a;
    --muted: #475569;
    --accent: #0ea5e9;
    --accent-2: #2563eb;
    --danger: #dc2626;
    --ok: #16a34a;
    --warn: #d97706;
    --tile: #ffffff;
    --tile-border: #e5e7eb;
    --accent-rgb: 14, 165, 233;
    --tile-locked-bg: #e6f7ee;
    --tile-locked-border: #c2ecd5;
    --tile-solved-bg: #eef2ff;
    --tile-solved-border: #c7d2fe;
}

/* Sunset theme */
:root.theme-sunset {
    --bg: #1b1419;
    --panel: #22181f;
    --text: #fdeaf0;
    --muted: #f5cfe0;
    --accent: #ff7a59;
    --accent-2: #ff3d5a;
    --danger: #ff6b6b;
    --ok: #ffd166;
    --warn: #fca311;
    --tile: #2a1e26;
    --tile-border: #3a2932;
    --accent-rgb: 255, 122, 89;
    --tile-locked-bg: #2c2320;
    --tile-locked-border: #3e302b;
    --tile-solved-bg: #2b1f2a;
    --tile-solved-border: #3b2b37;
}

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

.app-header,
.app-footer {
    display: none;
}

.brand {
    font-weight: 700;
    letter-spacing: 0.4px;
}

.nav {
    display: inline-flex;
    gap: 12px;
    margin-left: 16px;
}

.nav-link {
    color: var(--muted);
    text-decoration: none;
}

.nav-link.active,
.nav-link:hover {
    color: var(--text);
}

.app-root {
    padding: 36px 16px 24px;
    max-width: 900px;
    margin: 0 auto;
    position: relative;
}

/* Pyramid grid */
.pyramid {
    display: grid;
    gap: 10px;
    position: relative;
}

.row {
    display: grid;
    gap: 10px;
    justify-content: center;
}

.row-1 {
    grid-template-columns: repeat(1, var(--tile-size));
}

.row-2 {
    grid-template-columns: repeat(2, var(--tile-size));
}

.row-3 {
    grid-template-columns: repeat(3, var(--tile-size));
}

.row-4 {
    grid-template-columns: repeat(4, var(--tile-size));
}

.row-5 {
    grid-template-columns: repeat(5, var(--tile-size));
}

.row-6 {
    grid-template-columns: repeat(6, var(--tile-size));
}

.row-7 {
    grid-template-columns: repeat(7, var(--tile-size));
}

.row-8 {
    grid-template-columns: repeat(8, var(--tile-size));
}

.row-9 {
    grid-template-columns: repeat(9, var(--tile-size));
}

.row-10 {
    grid-template-columns: repeat(10, var(--tile-size));
}

.tile {
    background: var(--tile);
    border: 1px solid var(--tile-border);
    padding: 14px 10px;
    min-height: var(--tile-min-h);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    cursor: pointer;
    user-select: none;
    transition: transform 120ms ease, background 200ms ease, color 200ms ease, border-color 200ms ease;
}

.tile .word {
    opacity: 1;
    transition: opacity 240ms ease;
}

.tile.hiding .word {
    opacity: 0;
}

.tile.selected {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    background: rgba(var(--accent-rgb), 0.12);
    border-color: rgba(var(--accent-rgb), 0.35);
}

.tile.locked {
    background: var(--tile-locked-bg);
    border-color: var(--tile-locked-border);
    cursor: default;
}

.tile.solved {
    background: var(--tile-solved-bg);
    border-color: var(--tile-solved-border);
}

.tile.shake {
    animation: shake 420ms ease;
}

.tile.melting {
    animation: meltTile 360ms ease forwards;
}

@keyframes meltTile {
    0% {
        transform: scale(1);
        opacity: 1;
        filter: blur(0px);
    }

    40% {
        transform: scale(0.92);
        opacity: 0.8;
        filter: blur(0.5px);
    }

    100% {
        transform: scale(0.85);
        opacity: 0;
        filter: blur(1px);
    }
}

.controls {
    display: flex;
    gap: 10px;
    margin: 18px 0;
    align-items: center;
    flex-wrap: wrap;
}

.lives {
    color: var(--muted);
}

.lives-dots {
    display: inline-flex;
    gap: 6px;
    margin-left: 6px;
}

.lives-dots .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #2a2a35;
    border: 1px solid #353545;
    display: inline-block;
}

.lives-dots .dot.filled {
    background: #ff00aa;
    border-color: #ff5cc8;
    box-shadow: 0 0 12px 0 rgba(255, 0, 170, 0.35);
}

.lives-dots .dot.filled {
    animation: pulseLife 1200ms ease-in-out infinite;
}

@keyframes pulseLife {
    0% {
        transform: scale(1);
        box-shadow: 0 0 8px 0 rgba(255, 0, 170, 0.25);
    }

    50% {
        transform: scale(1.15);
        box-shadow: 0 0 14px 2px rgba(255, 0, 170, 0.45);
    }

    100% {
        transform: scale(1);
        box-shadow: 0 0 8px 0 rgba(255, 0, 170, 0.25);
    }
}

.lives-dots .dot.lost {
    animation: lifeLost 500ms ease;
}

@keyframes lifeLost {
    0% {
        transform: scale(1);
        opacity: 1;
    }

    50% {
        transform: scale(1.3);
        opacity: 0.6;
    }

    100% {
        transform: scale(1);
        opacity: 0.25;
    }
}

button {
    background: var(--panel);
    color: var(--text);
    border: 1px solid #2a2a35;
    padding: 10px 14px;
    border-radius: 8px;
    cursor: pointer;
}

button.primary {
    background: var(--accent-2);
    border-color: transparent;
    color: #081018;
}

button.danger {
    background: #2a1414;
    border-color: #3a1c1c;
    color: #ffdede;
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.banner {
    padding: 12px 14px;
    border: 1px solid #2a2a35;
    border-radius: 8px;
    background: #151520;
}

.banner.ok {
    background: #102117;
    border-color: #193325;
    color: #ccf5de;
}

.banner.error {
    background: #201516;
    border-color: #3a2425;
    color: #ffd7d9;
}

/* Admin */
.admin-form {
    display: grid;
    gap: 18px;
}

.category {
    background: var(--panel);
    border: 1px solid #20202a;
    border-radius: 10px;
    padding: 14px;
}

.category h3 {
    margin: 0 0 8px;
    font-size: 16px;
}

.category .grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

.category input[type="text"] {
    width: 100%;
    padding: 10px;
    background: #101018;
    border: 1px solid #242435;
    border-radius: 8px;
    color: var(--text);
}

.category textarea {
    width: 100%;
    padding: 10px;
    background: #101018;
    border: 1px solid #242435;
    border-radius: 8px;
    color: var(--text);
    resize: vertical;
}

.category small {
    color: var(--muted);
}

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

.admin-actions .full-row {
    flex-basis: 100%;
}

.output {
    word-break: break-all;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    color: var(--muted);
}

/* Animations */
@keyframes shake {
    0% {
        transform: translateX(0);
    }

    20% {
        transform: translateX(-6px);
    }

    40% {
        transform: translateX(6px);
    }

    60% {
        transform: translateX(-5px);
    }

    80% {
        transform: translateX(5px);
    }

    100% {
        transform: translateX(0);
    }
}

.row-solved {
    animation: rowFlash 500ms ease;
}

@keyframes rowFlash {
    0% {
        transform: scale(0.985);
    }

    100% {
        transform: scale(1);
    }
}

/* Help */
.help {
    color: var(--muted);
}

.admin-link {
    position: fixed;
    right: 14px;
    bottom: 12px;
    font-size: 12px;
    color: var(--muted);
    text-decoration: none;
    opacity: 0.7;
}

.admin-link:hover {
    opacity: 1;
    color: var(--text);
}

.admin-link svg path {
    fill: currentColor;
}

/* Merged solved row */
.site-footer {
    position: fixed;
    left: 50%;
    bottom: 8px;
    transform: translateX(-50%);
    color: var(--muted);
    font-size: 12px;
    opacity: 0.8;
    pointer-events: none;
}

.merged-cell {
    grid-column: 1 / -1;
    padding: 14px 10px;
    min-height: var(--tile-min-h);
    height: var(--tile-min-h);
    border-radius: 12px;
    border: 1px solid #2a2a35;
    animation: meltIn 280ms ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.merged-title {
    font-weight: 700;
    margin: 0;
    font-size: 14px;
}

.merged-words {
    color: var(--muted);
    font-size: 12px;
    margin: 0;
}

@keyframes meltIn {
    from {
        transform: scale(0.96);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* Fireworks */
.fireworks-layer {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.firework-particle {
    position: absolute;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: fw-explode 900ms ease-out forwards, fw-fade 900ms ease-out forwards;
    box-shadow: 0 0 10px 2px currentColor;
}

@keyframes fw-explode {
    0% {
        transform: translate(-50%, -50%) translate(0, 0) scale(0.6);
    }

    80% {
        transform: translate(-50%, -50%) translate(var(--tx), var(--ty)) scale(1);
    }

    100% {
        transform: translate(-50%, -50%) translate(calc(var(--tx) * 1.05), calc(var(--ty) * 1.05)) scale(0.9);
    }
}

@keyframes fw-fade {
    0% {
        opacity: 1;
    }

    70% {
        opacity: 1;
    }

    100% {
        opacity: 0;
    }
}