/* ═══════════════════════════════════════════════
   Snake · Polyglot Edition  ·  v9
   ═══════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:ital,wght@0,400;0,500;0,600;0,700;0,800;1,400&family=JetBrains+Mono:wght@400;500;700&display=swap');

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

:root {
    --green:   #22c55e;
    --green-l: #4ade80;
    --green-d: #16a34a;
    --amber:   #f59e0b;
    --cyan:    #06b6d4;
    --purple:  #a855f7;
    --red:     #ef4444;
    --bg:      #080809;
    --s1:      #0d0d10;
    --s2:      #131316;
    --s3:      #1a1a1f;
    --border:  rgba(255,255,255,0.07);
    --text:    #e2e2e5;
    --text2:   #6b6b74;
    --text3:   #3a3a42;
    --mono:    'JetBrains Mono', ui-monospace, monospace;
    --sans:    'Inter', system-ui, -apple-system, sans-serif;
}

html { overscroll-behavior: none; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    min-height: 100dvh;
    display: flex;
    justify-content: center;
    align-items: center;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overscroll-behavior: none;
    touch-action: none;
    overflow: hidden;
}

/* ── App ─────────────────────────────────────── */
#app {
    width: 100%;
    max-width: 620px;
    padding: 18px 14px;
}

/* ── Game frame ──────────────────────────────── */
#game-frame {
    border-radius: 14px;
    overflow: hidden;
    border: 1px solid var(--border);
    background: var(--s1);
    box-shadow: 0 24px 64px rgba(0,0,0,0.55), 0 0 0 1px rgba(255,255,255,0.015);
}

/* ── HUD ─────────────────────────────────────── */
#hud {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 14px;
    border-bottom: 1px solid var(--border);
    background: var(--s2);
    min-height: 36px;
}

.hud-group { display: flex; gap: 16px; }
.hud-cell  { display: flex; align-items: baseline; gap: 5px; }

.hud-label {
    font-family: var(--mono);
    font-size: 0.46rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    color: var(--text3);
}

.hud-value {
    font-family: var(--mono);
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--green);
    min-width: 1ch;
    transition: transform 0.1s ease;
}

.hud-value.dim  { color: var(--text2); }
.hud-value.bump { transform: scale(1.2); }

.hud-powerup {
    display: flex; align-items: center; gap: 4px;
    padding: 2px 7px;
    border-radius: 4px;
    font-family: var(--mono);
    font-size: 0.56rem; font-weight: 600;
    border: 1px solid transparent;
}
.hud-powerup.pu-speed  { color: var(--amber);  background: rgba(245,158,11,0.07);  border-color: rgba(245,158,11,0.14); }
.hud-powerup.pu-shield { color: var(--cyan);   background: rgba(6,182,212,0.07);   border-color: rgba(6,182,212,0.14); }
.hud-powerup.pu-multi  { color: var(--purple); background: rgba(168,85,247,0.07);  border-color: rgba(168,85,247,0.14); }
.pu-icon { font-size: 0.7rem; }

/* ── Canvas ──────────────────────────────────── */
#canvas-wrap { position: relative; line-height: 0; }

#game {
    display: block;
    width: 100%; height: auto;
    aspect-ratio: 1;
    touch-action: none;
}

/* ── Overlay ─────────────────────────────────── */
#overlay {
    position: absolute; inset: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 12px;
    background: rgba(8,8,9,0.82);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    z-index: 10;
    transition: opacity 0.25s ease;
    overflow-y: auto;
}

/* ── Panel base ──────────────────────────────── */
.panel {
    width: 100%;
    max-width: 340px;
    border-radius: 14px;
    background: var(--s2);
    border: 1px solid var(--border);
    box-shadow: 0 16px 48px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.02);
    animation: fadein 0.28s cubic-bezier(0.16,1,0.3,1);
    overflow: hidden;
    flex-shrink: 0;
}

@keyframes fadein {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

.hidden { display: none !important; }

/* ═══════════════════════════════════════════════
   MENU HERO  —  asymmetric, editorial
   ═══════════════════════════════════════════════ */

.menu-hero {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 22px 22px 18px;
    border-bottom: 1px solid var(--border);
    background: var(--s1);
    overflow: hidden;
}

/* top left decorative number — editorial detail */
.hero-num {
    position: absolute;
    top: 10px; left: 14px;
    font-family: var(--mono);
    font-size: 0.48rem;
    font-weight: 500;
    color: var(--text3);
    letter-spacing: 0.08em;
    user-select: none;
}

/* subtle noise texture overlay */
.menu-hero::after {
    content: '';
    position: absolute; inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
    background-size: 180px 180px;
    pointer-events: none;
    opacity: 0.6;
    mix-blend-mode: overlay;
}

.hero-left {
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 1;
}

.title-eyebrow {
    font-family: var(--mono);
    font-size: 0.46rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    color: var(--green);
    opacity: 0.65;
}

.title-main {
    font-family: var(--mono);
    font-size: 2.4rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--text);
    line-height: 1;
}

.title-meta {
    display: flex;
    align-items: center;
    gap: 6px;
}

.meta-dot {
    width: 5px; height: 5px;
    border-radius: 50%;
    background: var(--green);
    opacity: 0.5;
    flex-shrink: 0;
}

.meta-text {
    font-size: 0.56rem;
    color: var(--text2);
    font-style: italic;
    letter-spacing: 0.01em;
}

/* snake illustration — right side */
.hero-right { z-index: 1; flex-shrink: 0; }

.snake-mark {
    width: 68px; height: 68px;
    filter: drop-shadow(0 2px 16px rgba(34,197,94,0.18));
    animation: snake-idle 4s ease-in-out infinite;
}

@keyframes snake-idle {
    0%, 100% { transform: rotate(-2deg) translateY(0); }
    50%       { transform: rotate(2deg) translateY(-3px); }
}

/* ═══════════════════════════════════════════════
   MENU BODY
   ═══════════════════════════════════════════════ */

.menu-body {
    padding: 16px 18px 18px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.section-label {
    font-family: var(--mono);
    font-size: 0.44rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    color: var(--text3);
    margin-bottom: 5px;
}

/* Mode buttons */
#modes {
    display: flex;
    gap: 6px;
}

.mode-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 3px;
    padding: 10px 11px;
    background: var(--s1);
    border: 1px solid var(--border);
    border-radius: 9px;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
    text-align: left;
}

.mode-btn:hover {
    border-color: rgba(255,255,255,0.12);
}

.mode-btn.selected {
    border-color: rgba(34,197,94,0.28);
    background: rgba(34,197,94,0.04);
}

.mode-name {
    display: block;
    font-family: var(--sans);
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text2);
    transition: color 0.15s;
}

.mode-btn.selected .mode-name { color: var(--text); }

.mode-tag {
    display: block;
    font-size: 0.48rem;
    color: var(--text3);
    line-height: 1.3;
}

/* Speed */
.speed-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.speed-row .section-label { margin-bottom: 0; white-space: nowrap; }

.speed-options {
    display: flex;
    gap: 4px;
    flex: 1;
}

.spd-btn {
    flex: 1;
    padding: 6px 4px;
    font-family: var(--sans);
    font-size: 0.6rem;
    font-weight: 500;
    color: var(--text2);
    background: var(--s1);
    border: 1px solid var(--border);
    border-radius: 7px;
    cursor: pointer;
    transition: all 0.14s;
}

.spd-btn:hover { color: var(--text); border-color: rgba(255,255,255,0.12); }

.spd-btn.selected {
    color: var(--green);
    border-color: rgba(34,197,94,0.3);
    background: rgba(34,197,94,0.05);
    font-weight: 600;
}

/* Buttons reset */
button { cursor: pointer; border: none; outline: none; font-family: var(--sans); }

/* Play button */
#play-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--sans);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    padding: 13px;
    background: var(--green);
    color: #040805;
    border-radius: 9px;
    transition: background 0.14s, transform 0.1s, box-shadow 0.15s;
    box-shadow: 0 1px 0 rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.12);
}

#play-btn:hover {
    background: var(--green-l);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(34,197,94,0.22), inset 0 1px 0 rgba(255,255,255,0.18);
}

#play-btn:active { transform: translateY(0); box-shadow: none; }

/* ═══════════════════════════════════════════════
   MENU FOOTER
   ═══════════════════════════════════════════════ */

.menu-footer {
    border-top: 1px solid var(--border);
    padding: 11px 18px 14px;
    background: rgba(0,0,0,0.15);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.controls-ref {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 3px;
    flex-wrap: wrap;
}

kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px; height: 17px;
    padding: 0 4px;
    font-family: var(--mono);
    font-size: 0.43rem;
    font-weight: 500;
    color: var(--text3);
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.09);
    border-radius: 3px;
}

.sep { font-size: 0.46rem; color: var(--text3); margin: 0 1px; }

.swipe-hint {
    display: none;
    font-size: 0.52rem;
    color: var(--text3);
}

.lang-tags {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 3px;
    flex-wrap: wrap;
}

.tag {
    font-family: var(--mono);
    font-size: 0.44rem;
    font-weight: 500;
    padding: 2px 7px;
    border-radius: 3px;
    border: 1px solid rgba(255,255,255,0.06);
    color: var(--text3);
    background: rgba(255,255,255,0.02);
    letter-spacing: 0.03em;
}

.tag.js { color: #a16207; border-color: rgba(161,98,7,0.2); }
.tag.py { color: #1d4ed8; border-color: rgba(29,78,216,0.2); }
.tag.cc { color: #6d28d9; border-color: rgba(109,40,217,0.2); }
.tag.rs { color: #c2410c; border-color: rgba(194,65,12,0.2); }
.tag.go { color: #0e7490; border-color: rgba(14,116,144,0.2); }

/* ═══════════════════════════════════════════════
   DEATH PANEL
   ═══════════════════════════════════════════════ */

#death {
    padding: 24px 22px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
}

.death-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.death-label {
    font-family: var(--mono);
    font-size: 0.56rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    color: var(--red);
    opacity: 0.8;
}

#death-stats {
    display: flex;
    align-items: center;
    padding: 14px 0;
    background: rgba(255,255,255,0.02);
    border-radius: 9px;
    border: 1px solid var(--border);
}

.d-stat {
    flex: 1;
    text-align: center;
    padding: 0 10px;
}

.d-divider {
    width: 1px; height: 28px;
    background: var(--border);
    flex-shrink: 0;
}

.d-val {
    display: block;
    font-family: var(--mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 2px;
    line-height: 1;
}

.d-label {
    display: block;
    font-size: 0.46rem;
    color: var(--text3);
    letter-spacing: 0.1em;
}

#new-best {
    font-size: 0.58rem;
    font-weight: 600;
    color: var(--amber);
    text-align: center;
    padding: 6px 12px;
    background: rgba(245,158,11,0.06);
    border: 1px solid rgba(245,158,11,0.14);
    border-radius: 6px;
    display: inline-block;
    align-self: center;
}

#retry-btn {
    font-family: var(--sans);
    font-size: 0.78rem;
    font-weight: 600;
    padding: 12px;
    background: var(--s3);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 9px;
    transition: background 0.14s, border-color 0.14s;
}

#retry-btn:hover {
    background: var(--s1);
    border-color: rgba(255,255,255,0.12);
}

/* ═══════════════════════════════════════════════
   PAUSE PANEL
   ═══════════════════════════════════════════════ */

#pause {
    padding: 24px 22px;
}

.pause-inner {
    display: flex;
    align-items: center;
    gap: 14px;
}

.pause-bars {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
}

.pause-bars span {
    display: block;
    width: 4px; height: 22px;
    background: var(--text2);
    border-radius: 2px;
    opacity: 0.4;
}

.pause-label {
    font-family: var(--mono);
    font-size: 0.6rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    color: var(--text2);
    margin-bottom: 4px;
}

.pause-hint {
    font-size: 0.56rem;
    color: var(--text3);
    line-height: 1.5;
}

.pause-hint kbd {
    display: inline-flex; align-items: center; justify-content: center;
    min-width: 20px; height: 16px; padding: 0 4px;
    font-family: var(--mono); font-size: 0.43rem; font-weight: 500;
    color: var(--text3); background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.09); border-radius: 3px;
}

/* ═══════════════════════════════════════════════
   TOUCH D-PAD
   ═══════════════════════════════════════════════ */

#touch-controls {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    margin-top: 10px;
}

.t-row { display: flex; gap: 3px; }

.t-btn {
    width: 50px; height: 50px;
    background: var(--s2);
    color: var(--text2);
    border: 1px solid var(--border);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    touch-action: manipulation;
    transition: background 0.08s, color 0.08s;
}

.t-btn:active {
    background: rgba(34,197,94,0.08);
    color: var(--green);
}

/* ═══════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════ */

@media (hover: none) and (pointer: coarse) {
    #touch-controls { display: flex; }
    .controls-ref   { display: none; }
    .swipe-hint     { display: block; }
}

@media (max-width: 480px) {
    #touch-controls { display: flex; }
    .controls-ref   { display: none; }
    .swipe-hint     { display: block; }
    .title-main     { font-size: 2rem; }
    .snake-mark     { width: 56px; height: 56px; }
    .menu-hero      { padding: 20px 16px 16px; }
    .menu-body      { padding: 14px 14px 16px; }
    .menu-footer    { padding: 10px 14px 12px; }
    #hud            { padding: 7px 10px; }
    .hud-group      { gap: 12px; }
}

@media (max-width: 360px) {
    .title-main  { font-size: 1.7rem; }
    .snake-mark  { width: 48px; height: 48px; }
    .hero-num    { display: none; }
}

@supports (padding-top: env(safe-area-inset-top)) {
    #app { padding-top: calc(10px + env(safe-area-inset-top)); }
}