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

:root {
    --bg-deep: #050816;
    --bg-night: #0b1026;
    --panel: rgba(13, 20, 45, 0.92);
    --panel-strong: rgba(18, 27, 58, 0.95);
    --panel-soft: rgba(28, 39, 78, 0.74);
    --line: rgba(120, 159, 255, 0.22);
    --line-strong: rgba(56, 189, 248, 0.55);
    --text: #edf4ff;
    --muted: #a9b8d6;
    --cyan: #38d5ff;
    --blue: #3b82f6;
    --violet: #9b5cff;
    --gold: #f7c948;
    --green: #2ee59d;
    --red: #ff5c7a;
    --shadow: 0 24px 70px rgba(0, 0, 0, 0.48);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.keyboard-help,
.field-help {
    margin: 10px 0 0;
    color: var(--text-muted, #aebbd0);
    font-size: 0.88rem;
    line-height: 1.45;
}

button:disabled,
.button-disabled {
    cursor: not-allowed;
    opacity: 0.58;
}

dialog {
    width: min(92vw, 420px);
    padding: 24px;
    color: var(--text, #eef6ff);
    background: #111b2e;
    border: 1px solid rgba(115, 225, 255, 0.45);
    border-radius: 16px;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.6);
}

dialog::backdrop { background: rgba(2, 7, 18, 0.78); }
dialog form { display: grid; gap: 14px; }
dialog h2 { margin: 0; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 10px; }

.learning-panel,
.bfs-graph-panel {
    margin: 14px 0;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: rgba(7, 14, 34, 0.72);
}

.learning-panel-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 14px;
}

.learning-panel h2,
.bfs-graph-panel h2 { margin: 5px 0 7px; font-size: 1rem; }
.learning-panel p { color: var(--muted); line-height: 1.5; }
.phase-badge,
.step-progress,
.queue-state {
    display: inline-flex;
    align-items: center;
    min-height: 28px;
    padding: 4px 9px;
    border: 1px solid rgba(56, 213, 255, 0.42);
    border-radius: 999px;
    color: var(--cyan);
    background: rgba(56, 213, 255, 0.08);
    font-size: 0.78rem;
    font-weight: 800;
}

.algorithm-meta { margin-top: 8px; color: var(--gold); font-size: 0.82rem; }
.visual-state { margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--line); }
.visual-state p::before { content: "◎ "; color: var(--cyan); }

.tile { position: relative; transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease, opacity 160ms ease; }
.tile::after {
    content: attr(data-state);
    position: absolute;
    left: 50%;
    bottom: -19px;
    transform: translateX(-50%);
    width: max-content;
    max-width: 82px;
    color: var(--muted);
    font-size: 9px;
    line-height: 1;
    opacity: 0;
    pointer-events: none;
}
.tile.algorithm-active { border-style: dashed; border-color: var(--cyan); }
.tile.algorithm-active::after,
.tile.trace-expected::after,
.tile.algorithm-sorted::after,
.tile.bfs-visited::after,
.tile.binary-mid::after { opacity: 1; }
.tile.algorithm-complete { opacity: 0.62; }
.tile.algorithm-sorted { border-color: var(--green); box-shadow: inset 0 -4px 0 rgba(46, 229, 157, 0.55); }
.tile.trace-expected { transform: translateY(-4px); }

.graph-scroll { overflow-x: auto; overscroll-behavior-inline: contain; }
#bfsGraph { display: block; width: 100%; min-width: 520px; min-height: 220px; }
.graph-edge { stroke: rgba(169, 184, 214, 0.42); stroke-width: 3; }
.graph-edge.visited { stroke: var(--green); }
.graph-node circle { fill: #121e3c; stroke: var(--muted); stroke-width: 3; transition: fill 160ms ease, stroke 160ms ease; }
.graph-node text { fill: var(--text); font-weight: 900; font-size: 15px; }
.graph-node.visited circle { fill: rgba(46, 229, 157, 0.22); stroke: var(--green); }
.graph-node.current circle { fill: rgba(247, 201, 72, 0.22); stroke: var(--gold); stroke-width: 5; }
.result-actions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; margin-top: 16px; }

button:focus-visible,
select:focus-visible,
input:focus-visible,
.tile:focus-visible {
    outline: 3px solid #ffd166;
    outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

@media (max-width: 620px) {
    button, select, input { min-height: 44px; }
    .buttons { display: grid; grid-template-columns: 1fr; }
    .tile-board { overflow-wrap: anywhere; }
    .tile { min-width: 40px; min-height: 44px; touch-action: manipulation; }
    .leaderboard-table-wrapper { overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .learning-panel-header { align-items: stretch; flex-direction: column; }
    .step-progress, .queue-state { align-self: flex-start; }
    .result-actions { grid-template-columns: 1fr; }
    #bfsGraph { min-width: 480px; }
}

/* =========================================================
   Cyber Game UI — final visual layer
   ========================================================= */
:root {
    --hud-cyan: #4de8ff;
    --hud-blue: #3488ff;
    --hud-violet: #9d69ff;
    --hud-gold: #ffd45b;
    --hud-green: #36f1aa;
    --hud-red: #ff557d;
    --surface-0: #050816;
    --surface-1: rgba(8, 15, 35, 0.94);
    --surface-2: rgba(13, 24, 51, 0.88);
    --surface-3: rgba(18, 33, 66, 0.72);
    --hud-line: rgba(93, 170, 255, 0.23);
    --hud-line-bright: rgba(77, 232, 255, 0.58);
    --hud-shadow: 0 18px 55px rgba(0, 0, 0, 0.42);
}

body {
    padding: clamp(10px, 1.7vw, 24px) 0;
    background:
        radial-gradient(circle at 15% 0%, rgba(50, 159, 255, 0.18), transparent 34%),
        radial-gradient(circle at 90% 14%, rgba(157, 105, 255, 0.16), transparent 32%),
        linear-gradient(rgba(77, 232, 255, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(77, 232, 255, 0.025) 1px, transparent 1px),
        linear-gradient(145deg, #030611, #080d21 52%, #090719);
    background-size: auto, auto, 34px 34px, 34px 34px, auto;
}

body::after {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(ellipse at center, transparent 40%, rgba(0, 0, 0, 0.48) 100%);
    z-index: -1;
}

.app-container {
    width: min(100% - 24px, 1160px);
    gap: 12px;
    padding: clamp(12px, 1.6vw, 20px);
    overflow: hidden;
    border: 1px solid rgba(77, 232, 255, 0.2);
    border-radius: 24px;
    background: linear-gradient(150deg, rgba(12, 23, 49, 0.86), rgba(5, 9, 24, 0.95));
    box-shadow: 0 32px 90px rgba(0, 0, 0, 0.55), inset 0 1px 0 rgba(255, 255, 255, 0.035);
}

.hero-panel {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    min-height: 0;
    padding: 18px 24px;
    text-align: left;
    overflow: hidden;
    border: 1px solid rgba(77, 232, 255, 0.28);
    border-radius: 18px;
    background:
        linear-gradient(110deg, rgba(11, 34, 65, 0.9), rgba(20, 14, 52, 0.87)),
        radial-gradient(circle at 35% 0%, rgba(77, 232, 255, 0.2), transparent 45%);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06), 0 16px 46px rgba(0, 0, 0, 0.28);
}

.hero-panel::after {
    content: "SYSTEM ONLINE";
    position: absolute;
    top: 10px;
    right: 16px;
    color: rgba(54, 241, 170, 0.72);
    font: 700 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
    letter-spacing: 0.16em;
}

.hero-eyebrow { grid-column: 1; margin: 0 0 3px; font-size: 10px; letter-spacing: 0.19em; }
header h1 {
    grid-column: 1;
    margin: 0;
    font-size: clamp(34px, 5vw, 54px);
    line-height: 0.94;
    letter-spacing: -0.055em;
    text-shadow: 0 0 28px rgba(77, 232, 255, 0.34);
}
header p { grid-column: 1; margin: 7px 0 0; font-size: clamp(12px, 1.45vw, 15px); color: #c5d3ec; }
.hero-badges { grid-column: 2; grid-row: 1 / span 3; justify-content: flex-end; max-width: 350px; margin-top: 9px; }
.hero-badges span {
    min-height: 29px;
    padding: 6px 10px;
    border-color: rgba(255, 212, 91, 0.32);
    background: rgba(255, 212, 91, 0.055);
    box-shadow: none;
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.07em;
}

.game-panel {
    position: relative;
    max-width: 1060px;
    padding: clamp(14px, 2vw, 22px);
    border: 1px solid var(--hud-line);
    border-radius: 20px;
    background: linear-gradient(165deg, rgba(10, 19, 42, 0.96), rgba(5, 10, 27, 0.97));
    box-shadow: var(--hud-shadow), inset 0 1px 0 rgba(255, 255, 255, 0.035);
}

.game-panel::before {
    content: "ACTIVE MISSION // ALGORITHM TRAINING";
    display: block;
    margin: -3px 0 12px;
    color: rgba(77, 232, 255, 0.7);
    font: 700 9px/1.2 ui-monospace, SFMono-Regular, Consolas, monospace;
    letter-spacing: 0.16em;
}

.top-bar {
    grid-template-columns: minmax(190px, 1fr) minmax(190px, 1fr) 128px;
    gap: 8px;
}

.control-field,
.level-box {
    min-height: 62px;
    padding: 9px 11px;
    border: 1px solid var(--hud-line);
    border-radius: 12px;
    background: linear-gradient(150deg, rgba(22, 42, 79, 0.65), rgba(9, 18, 40, 0.76));
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.035);
}

.control-field label,
.level-box span,
.stats small {
    color: #89a4cc;
    font-size: 9px;
    font-weight: 800;
    letter-spacing: 0.13em;
    text-transform: uppercase;
}

select,
input {
    border-radius: 8px;
    border-color: rgba(103, 160, 255, 0.28);
    background: rgba(3, 9, 24, 0.76);
}

.level-box strong { color: var(--hud-gold); text-shadow: 0 0 16px rgba(255, 212, 91, 0.36); }

.stats { gap: 7px; margin-bottom: 10px; }
.stats div {
    position: relative;
    min-height: 58px;
    padding: 9px 12px 9px 39px;
    overflow: hidden;
    border: 1px solid rgba(80, 145, 242, 0.2);
    border-radius: 11px;
    background: linear-gradient(145deg, rgba(18, 35, 69, 0.74), rgba(7, 15, 34, 0.82));
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.035);
}
.stats div::before {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    color: var(--hud-cyan);
    font: 800 15px/1 ui-monospace, monospace;
    text-align: center;
    text-shadow: 0 0 12px rgba(77, 232, 255, 0.45);
}
.stats div:nth-child(1)::before { content: "↔"; }
.stats div:nth-child(2)::before { content: "◷"; }
.stats div:nth-child(3)::before { content: "◆"; color: var(--hud-gold); }
.stats div:nth-child(4)::before { content: "?"; color: var(--hud-violet); }
.stats div::after { width: 32px; height: 32px; opacity: 0.36; }
.stats span { font: 800 clamp(18px, 2vw, 24px)/1 ui-monospace, SFMono-Regular, Consolas, monospace; }

.message-box {
    position: relative;
    min-height: 48px;
    justify-content: flex-start;
    gap: 11px;
    padding: 10px 14px 10px 128px;
    overflow: hidden;
    border: 1px solid rgba(77, 232, 255, 0.34);
    border-left: 3px solid var(--hud-cyan);
    border-radius: 10px;
    background: linear-gradient(90deg, rgba(13, 42, 64, 0.65), rgba(5, 13, 31, 0.88));
    box-shadow: inset 0 0 26px rgba(77, 232, 255, 0.025);
    text-align: left;
}
.message-box::before {
    content: "MISSION LOG";
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    margin: 0;
    color: var(--hud-cyan);
    font: 800 9px/1 ui-monospace, monospace;
    letter-spacing: 0.13em;
}
.message-box.success { border-color: rgba(54, 241, 170, 0.44); border-left-color: var(--hud-green); background: linear-gradient(90deg, rgba(12, 61, 53, 0.6), rgba(5, 18, 28, 0.9)); }
.message-box.success::before { content: "MOVE VERIFIED"; color: var(--hud-green); }
.message-box.error { border-color: rgba(255, 85, 125, 0.5); border-left-color: var(--hud-red); background: linear-gradient(90deg, rgba(71, 18, 43, 0.6), rgba(20, 8, 24, 0.9)); }
.message-box.error::before { content: "MOVE REJECTED"; color: var(--hud-red); }

.pass-info {
    padding: 8px 12px;
    border-radius: 9px;
    border: 1px solid rgba(255, 212, 91, 0.2);
    background: rgba(255, 212, 91, 0.045);
    color: #f8df97;
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 12px;
}

.learning-panel,
.bfs-graph-panel,
.daily-challenge-panel,
.level-editor-panel,
.leaderboard-panel,
.how-to-play-panel {
    border: 1px solid var(--hud-line);
    border-radius: 15px;
    background: linear-gradient(155deg, rgba(15, 28, 58, 0.74), rgba(6, 13, 31, 0.86));
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03), 0 12px 32px rgba(0, 0, 0, 0.18);
}

.learning-panel { position: relative; padding: 13px 15px; overflow: hidden; }
.learning-panel::before {
    content: "BRIEFING";
    position: absolute;
    right: 14px;
    bottom: 10px;
    color: rgba(77, 232, 255, 0.08);
    font: 900 28px/1 ui-monospace, monospace;
    letter-spacing: 0.08em;
}
.learning-panel h2 { font-size: 15px; letter-spacing: 0.01em; }
.learning-panel p { max-width: 760px; font-size: 13px; }
.phase-badge,
.step-progress,
.queue-state { border-radius: 6px; letter-spacing: 0.07em; text-transform: uppercase; }
.algorithm-meta { font: 700 11px/1.4 ui-monospace, monospace; }
.visual-state { position: relative; z-index: 1; margin-top: 8px; padding-top: 8px; }

.tile-board {
    position: relative;
    min-height: 120px;
    padding: 25px 18px;
    overflow: hidden;
    border: 1px solid rgba(77, 232, 255, 0.27);
    border-radius: 15px;
    background:
        linear-gradient(rgba(77, 232, 255, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(77, 232, 255, 0.035) 1px, transparent 1px),
        radial-gradient(circle at center, rgba(35, 113, 187, 0.12), rgba(3, 9, 22, 0.82));
    background-size: 22px 22px, 22px 22px, auto;
    box-shadow: inset 0 0 38px rgba(0, 0, 0, 0.38), 0 0 28px rgba(77, 232, 255, 0.035);
}
.tile-board::before {
    content: "PUZZLE GRID";
    position: absolute;
    top: 8px;
    left: 12px;
    color: rgba(77, 232, 255, 0.42);
    font: 700 8px/1 ui-monospace, monospace;
    letter-spacing: 0.14em;
}

.tile {
    isolation: isolate;
    border: 1px solid rgba(106, 216, 255, 0.72);
    border-bottom-color: rgba(52, 87, 225, 0.82);
    border-radius: 12px;
    background:
        linear-gradient(145deg, rgba(255, 255, 255, 0.18), transparent 34%),
        linear-gradient(150deg, #20cdf2, #3978ee 55%, #6355e7);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.42),
        inset 0 -5px 12px rgba(35, 34, 135, 0.28),
        0 8px 18px rgba(21, 70, 184, 0.3),
        0 0 16px rgba(77, 232, 255, 0.13);
    color: white;
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.4);
}
.tile:hover { transform: translateY(-4px) scale(1.035); box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.5), 0 13px 24px rgba(27, 88, 215, 0.38), 0 0 24px rgba(77, 232, 255, 0.28); }
.tile:active { transform: translateY(-1px) scale(0.97); }
.tile.selected { border: 2px solid white; transform: translateY(-5px); box-shadow: 0 0 0 3px rgba(157, 105, 255, 0.55), 0 0 28px rgba(157, 105, 255, 0.65); }
.tile.selected::before { content: "◆"; position: absolute; top: -13px; left: 50%; transform: translateX(-50%); color: white; font-size: 9px; }
.tile.algorithm-active { border-style: dashed; border-color: var(--hud-cyan); }
.tile.trace-expected { transform: translateY(-5px); box-shadow: 0 0 0 3px rgba(255, 212, 91, 0.3), 0 0 28px rgba(255, 212, 91, 0.52); }
.tile.trace-expected::before { content: "▼"; position: absolute; top: -15px; left: 50%; transform: translateX(-50%); color: var(--hud-gold); font-size: 10px; }
.tile.quick-pivot { background: linear-gradient(150deg, #b16cff, #7447e8 55%, #4c34bd); border-color: #e2bdff; }
.tile.heap-root { background: linear-gradient(150deg, #ffc857, #f58a36 62%, #d34c46); border-color: #ffe4a5; }
.tile.bfs-visited,
.tile.binary-found,
.tile.algorithm-sorted { background: linear-gradient(150deg, #3ae5aa, #159c85 58%, #0b6d72); border-color: #a4ffe0; }
.tile.bfs-next,
.tile.binary-mid { box-shadow: 0 0 0 3px rgba(255, 212, 91, 0.35), 0 0 30px rgba(255, 212, 91, 0.55); }
.tile.algorithm-complete { filter: saturate(0.62); opacity: 0.62; }
.tile::after { bottom: -17px; color: #a8c5ec; font: 700 8px/1 ui-monospace, monospace; letter-spacing: 0.04em; text-transform: uppercase; }

.buttons { justify-content: center; gap: 8px; }
button {
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(119, 208, 255, 0.48);
    border-radius: 9px;
    background: linear-gradient(145deg, #20c8ef, #377fee);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.34), 0 7px 16px rgba(22, 79, 196, 0.24);
    color: #041023;
    font-size: 12px;
    font-weight: 850;
    letter-spacing: 0.025em;
}
button::after { content: ""; position: absolute; inset: 0; background: linear-gradient(110deg, transparent 20%, rgba(255, 255, 255, 0.22) 48%, transparent 70%); transform: translateX(-130%); transition: transform 320ms ease; }
button:hover { transform: translateY(-2px); filter: brightness(1.08); }
button:hover::after { transform: translateX(130%); }
button:active { transform: translateY(0) scale(0.98); }
#hintBtn { background: linear-gradient(145deg, #ffe06e, #f2a93d); border-color: #ffe8a2; color: #211407; }
#resetBtn,
#skipLeaderboardBtn,
.clear-button { background: rgba(87, 103, 141, 0.22); border-color: rgba(147, 164, 199, 0.3); color: #c7d3e8; box-shadow: none; }
#newPuzzleBtn { background: linear-gradient(145deg, #a96bff, #7448df); border-color: #cba7ff; color: white; }
#nextLevelBtn,
#resultDailyBtn,
#dailyChallengeBtn { background: linear-gradient(145deg, #37efb0, #18a9bb); border-color: #9dffe2; color: #031a1c; }
#changeAlgorithmBtn,
#replayBtn { background: linear-gradient(145deg, #22c9ef, #397cee); }

.result-panel {
    position: relative;
    width: min(100%, 660px);
    padding: 26px;
    overflow: hidden;
    border: 1px solid rgba(54, 241, 170, 0.62);
    border-radius: 18px;
    background:
        radial-gradient(circle at 50% 0%, rgba(54, 241, 170, 0.16), transparent 47%),
        linear-gradient(155deg, rgba(11, 43, 50, 0.88), rgba(6, 15, 31, 0.97));
    box-shadow: 0 0 0 1px rgba(54, 241, 170, 0.08), 0 24px 60px rgba(0, 0, 0, 0.42), inset 0 1px 0 rgba(255, 255, 255, 0.06);
    animation: missionComplete 360ms cubic-bezier(.2, .85, .25, 1.15);
}
.result-panel::before { content: "CHALLENGE CLEARED"; display: inline-flex; padding: 5px 9px; border: 1px solid rgba(54, 241, 170, 0.38); border-radius: 6px; color: var(--hud-green); font: 800 9px/1 ui-monospace, monospace; letter-spacing: 0.13em; }
.result-panel h2 { margin: 12px 0 17px; font-size: clamp(25px, 4vw, 38px); letter-spacing: -0.04em; text-shadow: 0 0 25px rgba(54, 241, 170, 0.38); }
.result-panel p:not(.stars) { display: inline-grid; min-width: 132px; margin: 4px; padding: 10px; border: 1px solid rgba(102, 164, 224, 0.2); border-radius: 9px; background: rgba(10, 23, 46, 0.72); color: #a9bcd8; font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em; }
.result-panel p:not(.stars) span { display: block; margin-top: 4px; color: white; font: 800 19px/1 ui-monospace, monospace; }
.result-panel .stars { margin: 16px 0 12px; color: var(--hud-gold); font-size: 38px; letter-spacing: 0.16em; filter: drop-shadow(0 0 10px rgba(255, 212, 91, 0.48)); animation: starReveal 480ms ease-out both; }
.result-actions { grid-template-columns: 1fr 1fr; max-width: 500px; margin-inline: auto; }
.result-actions button { min-height: 46px; }

.bfs-graph-panel { padding: 14px; overflow: hidden; }
.graph-scroll { border: 1px solid rgba(77, 232, 255, 0.12); border-radius: 12px; background: radial-gradient(circle at center, rgba(36, 108, 157, 0.12), rgba(3, 9, 23, 0.72)); }
.graph-edge { stroke: rgba(104, 145, 194, 0.4); stroke-width: 2; }
.graph-edge.visited { stroke: var(--hud-green); filter: drop-shadow(0 0 4px rgba(54, 241, 170, 0.45)); }
.graph-node circle { fill: #0c1733; stroke: #7891b7; stroke-width: 2.5; }
.graph-node.visited circle { fill: rgba(54, 241, 170, 0.16); stroke: var(--hud-green); filter: drop-shadow(0 0 7px rgba(54, 241, 170, 0.45)); }
.graph-node.current circle { fill: rgba(255, 212, 91, 0.16); stroke: var(--hud-gold); stroke-width: 4; filter: drop-shadow(0 0 10px rgba(255, 212, 91, 0.58)); animation: nodePulse 1.4s ease-in-out infinite; }
.queue-state { color: var(--hud-gold); border-color: rgba(255, 212, 91, 0.36); background: rgba(255, 212, 91, 0.06); }

.daily-challenge-panel,
.level-editor-panel,
.leaderboard-panel { border-radius: 13px; }
.daily-challenge-panel h2,
.level-editor-panel h2,
.leaderboard-header h2 { letter-spacing: -0.02em; }
.leaderboard-table th { color: #8fb2dd; font-size: 9px; letter-spacing: 0.12em; }
.leaderboard-table tr:hover td { background: rgba(77, 232, 255, 0.045); }

.how-to-play-panel { opacity: 0.88; }
.how-to-play-panel h2::before { content: "FIELD MANUAL // "; color: var(--hud-cyan); font: 700 9px/1 ui-monospace, monospace; letter-spacing: 0.11em; }

@keyframes missionComplete {
    from { opacity: 0; transform: translateY(10px) scale(0.985); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes starReveal {
    from { opacity: 0; transform: scale(0.75); letter-spacing: 0; }
    to { opacity: 1; transform: scale(1); letter-spacing: 0.16em; }
}
@keyframes nodePulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.72; }
}

@media (max-width: 900px) {
    .hero-panel { grid-template-columns: 1fr; }
    .hero-badges { grid-column: 1; grid-row: auto; justify-content: flex-start; max-width: none; }
    .hero-panel::after { display: none; }
    .result-actions { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 620px) {
    body { padding: 6px 0; }
    .app-container { width: min(100% - 10px, 1160px); padding: 8px; border-radius: 15px; }
    .hero-panel { padding: 14px; border-radius: 13px; }
    header h1 { font-size: clamp(34px, 13vw, 46px); }
    .hero-badges { gap: 5px; }
    .hero-badges span { padding: 5px 7px; font-size: 8px; }
    .game-panel { padding: 11px; border-radius: 14px; }
    .game-panel::before { margin-bottom: 9px; font-size: 8px; }
    .top-bar { grid-template-columns: 1fr; }
    .level-box { grid-column: auto; min-height: 54px; }
    .stats { grid-template-columns: 1fr 1fr; gap: 6px; }
    .stats div { min-height: 55px; padding-left: 36px; }
    .message-box { padding: 35px 10px 10px; align-items: flex-start; min-height: 68px; }
    .message-box::before { top: 14px; left: 10px; transform: none; }
    .learning-panel { padding: 12px; }
    .learning-panel::before { display: none; }
    .tile-board { min-height: 112px; padding: 25px 9px 21px; gap: 7px; }
    .tile { min-width: 42px; min-height: 46px; width: 42px; height: 46px; font-size: 15px; }
    .buttons { grid-template-columns: 1fr 1fr; }
    #newPuzzleBtn { grid-column: 1 / -1; }
    .result-panel { padding: 18px 10px; }
    .result-panel p:not(.stars) { min-width: calc(50% - 12px); }
    .result-actions { grid-template-columns: 1fr; }
    .graph-scroll { border-radius: 9px; }
}

@media (prefers-reduced-motion: reduce) {
    .graph-node.current circle,
    .result-panel,
    .result-panel .stars { animation: none !important; }
    button::after { display: none; }
}

body {
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
    background:
        linear-gradient(rgba(56, 213, 255, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(155, 92, 255, 0.035) 1px, transparent 1px),
        radial-gradient(circle at 18% 8%, rgba(56, 213, 255, 0.18), transparent 30%),
        radial-gradient(circle at 86% 12%, rgba(155, 92, 255, 0.16), transparent 34%),
        radial-gradient(circle at 50% 100%, rgba(247, 201, 72, 0.08), transparent 40%),
        linear-gradient(145deg, var(--bg-deep), var(--bg-night) 54%, #080615);
    background-size: 42px 42px, 42px 42px, auto, auto, auto, auto;
    color: var(--text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: clamp(18px, 3vw, 42px) 0;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background:
        linear-gradient(115deg, transparent 0 35%, rgba(56, 213, 255, 0.055) 48%, transparent 60%),
        radial-gradient(circle at center, transparent 0, rgba(0, 0, 0, 0.28) 100%);
    mix-blend-mode: screen;
}

.app-container {
    width: min(1180px, calc(100% - 28px));
    position: relative;
    background: linear-gradient(180deg, rgba(12, 18, 40, 0.94), rgba(7, 11, 25, 0.95));
    border: 1px solid rgba(120, 159, 255, 0.24);
    border-radius: 24px;
    padding: clamp(18px, 3vw, 34px);
    box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, 0.06);
    overflow: hidden;
}

.app-container::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    border-radius: inherit;
    background: linear-gradient(135deg, rgba(56, 213, 255, 0.16), transparent 24%, transparent 72%, rgba(247, 201, 72, 0.12));
    opacity: 0.8;
}

.app-container > * {
    position: relative;
}

.hero-panel {
    min-height: 230px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: center;
    margin-bottom: 24px;
    padding: clamp(28px, 6vw, 62px) 18px;
    border: 1px solid rgba(56, 213, 255, 0.28);
    border-radius: 20px;
    background:
        linear-gradient(120deg, rgba(6, 12, 31, 0.96), rgba(24, 18, 53, 0.88)),
        repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.04) 0 1px, transparent 1px 16px);
    box-shadow: 0 0 42px rgba(56, 213, 255, 0.14), inset 0 0 60px rgba(155, 92, 255, 0.08);
}

.hero-eyebrow {
    color: var(--gold);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    margin-bottom: 12px;
}

header h1 {
    font-size: clamp(44px, 8vw, 86px);
    line-height: 0.95;
    color: #ffffff;
    text-shadow: 0 0 20px rgba(56, 213, 255, 0.52), 0 4px 0 rgba(59, 130, 246, 0.35);
    margin-bottom: 14px;
}

header p {
    color: #cfe2ff;
    font-size: clamp(16px, 2.2vw, 22px);
    margin-bottom: 22px;
}

.hero-badges {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
}

.hero-badges span {
    min-height: 34px;
    display: inline-flex;
    align-items: center;
    padding: 8px 13px;
    border: 1px solid rgba(247, 201, 72, 0.36);
    border-radius: 999px;
    background: rgba(8, 13, 31, 0.72);
    color: #fff3bd;
    font-size: 13px;
    font-weight: 800;
    box-shadow: 0 0 18px rgba(247, 201, 72, 0.1);
}

.how-to-play-panel,
.game-panel,
.daily-challenge-panel,
.level-editor-panel,
.leaderboard-panel {
    background: linear-gradient(180deg, var(--panel), rgba(10, 15, 34, 0.92));
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.045);
}

.how-to-play-panel {
    padding: clamp(18px, 2.8vw, 28px);
    margin-bottom: 24px;
}

.how-to-play-panel h2,
.level-editor-panel h2,
.daily-challenge-panel h2,
.leaderboard-header h2 {
    color: var(--cyan);
    font-size: clamp(19px, 2.4vw, 25px);
    margin-bottom: 16px;
    text-shadow: 0 0 16px rgba(56, 213, 255, 0.26);
}

.how-to-play-panel h2 {
    text-align: center;
}

.how-to-content {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.modes,
.controls {
    min-width: 0;
    padding: 18px;
    border: 1px solid rgba(120, 159, 255, 0.22);
    border-radius: 14px;
    background: linear-gradient(180deg, rgba(20, 31, 67, 0.72), rgba(8, 13, 31, 0.66));
}

.modes h3,
.controls h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #ffffff;
    font-size: 17px;
    margin-bottom: 12px;
}

.modes h3::before {
    content: "◇";
    color: var(--cyan);
}

.controls h3::before {
    content: "✦";
    color: var(--gold);
}

.how-to-play-panel ul {
    list-style: none;
    display: grid;
    gap: 8px;
}

.modes ul {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.how-to-play-panel li {
    color: var(--muted);
    line-height: 1.45;
    padding-left: 18px;
    position: relative;
    font-size: 14px;
}

.how-to-play-panel li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.62em;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--cyan);
    box-shadow: 0 0 12px rgba(56, 213, 255, 0.8);
}

.how-to-play-panel strong {
    color: var(--gold);
}

.game-panel {
    padding: clamp(18px, 3vw, 30px);
}

.top-bar {
    display: grid;
    grid-template-columns: minmax(230px, 1fr) minmax(220px, 1fr) auto;
    align-items: stretch;
    gap: 14px;
    margin-bottom: 18px;
}

.control-field,
.level-box {
    background: linear-gradient(180deg, rgba(20, 31, 67, 0.92), rgba(9, 14, 33, 0.94));
    border: 1px solid rgba(56, 213, 255, 0.24);
    border-radius: 14px;
    padding: 12px;
    box-shadow: inset 0 0 22px rgba(56, 213, 255, 0.04);
}

label,
.level-box span {
    display: block;
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    margin-bottom: 7px;
}

select,
input {
    width: 100%;
    min-height: 42px;
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid rgba(120, 159, 255, 0.28);
    outline: none;
    background: rgba(4, 8, 21, 0.9);
    color: var(--text);
    font-size: 15px;
}

select {
    cursor: pointer;
}

select:focus,
input:focus,
button:focus-visible,
.tile:focus-visible {
    outline: 3px solid rgba(247, 201, 72, 0.72);
    outline-offset: 3px;
    border-color: rgba(247, 201, 72, 0.72);
}

.level-box {
    min-width: 132px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.level-box strong {
    color: var(--gold);
    font-size: 24px;
    line-height: 1;
}

.stats {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 18px;
}

.stats div {
    min-height: 82px;
    position: relative;
    overflow: hidden;
    text-align: left;
    background: linear-gradient(160deg, rgba(9, 14, 33, 0.98), rgba(27, 35, 72, 0.86));
    border: 1px solid rgba(120, 159, 255, 0.2);
    border-radius: 14px;
    padding: 14px 16px;
    font-weight: 800;
}

.stats div::after {
    content: "";
    position: absolute;
    inset: auto 12px 10px auto;
    width: 34px;
    height: 34px;
    border: 1px solid rgba(56, 213, 255, 0.28);
    border-radius: 10px;
    transform: rotate(45deg);
    opacity: 0.52;
}

.stats small {
    display: block;
    color: var(--muted);
    font-size: 12px;
    margin-bottom: 8px;
    text-transform: uppercase;
}

.stats span {
    color: #ffffff;
    font-size: clamp(22px, 3vw, 30px);
    text-shadow: 0 0 14px rgba(56, 213, 255, 0.24);
}

.message-box,
.pass-info {
    border-radius: 14px;
    text-align: center;
    overflow-wrap: anywhere;
}

.message-box {
    min-height: 54px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(180deg, rgba(3, 7, 18, 0.98), rgba(12, 18, 40, 0.96));
    border: 1px solid rgba(56, 213, 255, 0.3);
    box-shadow: 0 0 24px rgba(56, 213, 255, 0.08), inset 0 0 22px rgba(56, 213, 255, 0.04);
    padding: 13px 16px;
    margin-bottom: 12px;
    color: #d8e8ff;
    font-weight: 700;
}

.message-box::before {
    content: "Quest Message";
    color: var(--gold);
    font-size: 11px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-right: 12px;
    white-space: nowrap;
}

.message-box.success {
    color: #c8ffe8;
    border-color: rgba(46, 229, 157, 0.72);
    box-shadow: 0 0 28px rgba(46, 229, 157, 0.16);
}

.message-box.error {
    color: #ffd0d9;
    border-color: rgba(255, 92, 122, 0.78);
    box-shadow: 0 0 28px rgba(255, 92, 122, 0.18);
}

.pass-info {
    background: rgba(247, 201, 72, 0.08);
    border: 1px solid rgba(247, 201, 72, 0.28);
    padding: 11px 14px;
    margin-bottom: 18px;
    color: #ffe89a;
    font-weight: 800;
}

.tile-board {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(clamp(30px, 5.2vw, 66px), max-content));
    justify-content: center;
    gap: clamp(6px, 1vw, 12px);
    min-height: 124px;
    margin-bottom: 22px;
    padding: clamp(14px, 2.4vw, 24px);
    border: 1px solid rgba(56, 213, 255, 0.28);
    border-radius: 18px;
    background:
        linear-gradient(rgba(56, 213, 255, 0.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(247, 201, 72, 0.035) 1px, transparent 1px),
        radial-gradient(circle at center, rgba(56, 213, 255, 0.09), transparent 60%),
        rgba(3, 7, 18, 0.78);
    background-size: 24px 24px, 24px 24px, auto, auto;
    box-shadow: inset 0 0 34px rgba(56, 213, 255, 0.08), 0 0 36px rgba(56, 213, 255, 0.08);
}

.tile {
    width: clamp(30px, 5.2vw, 66px);
    height: clamp(30px, 5.2vw, 66px);
    background: linear-gradient(145deg, #54e4ff, #2f65ff 55%, #5b35d6);
    border: 1px solid rgba(222, 245, 255, 0.48);
    border-radius: clamp(8px, 1.2vw, 14px);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: clamp(12px, 2vw, 25px);
    font-weight: 900;
    cursor: pointer;
    user-select: none;
    transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease, opacity 0.18s ease;
    color: white;
    overflow: hidden;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.32), inset 0 1px 0 rgba(255, 255, 255, 0.34);
}

.tile:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 14px 24px rgba(0, 0, 0, 0.36), 0 0 22px rgba(56, 213, 255, 0.32);
}

.tile.dragging {
    opacity: 0.55;
    transform: scale(0.96);
}

.tile.drag-over,
.tile.current-pass,
.tile.selected,
.tile.bfs-next {
    outline: 3px solid var(--gold);
    box-shadow: 0 0 24px rgba(247, 201, 72, 0.5), inset 0 0 18px rgba(247, 201, 72, 0.14);
}

.tile.current-key {
    outline: 3px dashed #ffe27a;
    box-shadow: 0 0 24px rgba(247, 201, 72, 0.42);
}

.tile.selected {
    transform: scale(1.08);
}

.tile.merge-active {
    outline: 3px solid var(--cyan);
    box-shadow: 0 0 24px rgba(56, 213, 255, 0.46);
}

.tile.quick-pivot {
    outline: 3px solid #ff64c7;
    box-shadow: 0 0 24px rgba(255, 100, 199, 0.44);
}

.tile.heap-root {
    outline: 3px solid #b999ff;
    box-shadow: 0 0 24px rgba(185, 153, 255, 0.45);
}

.tile.binary-range {
    outline: 3px solid rgba(46, 229, 157, 0.75);
    box-shadow: 0 0 20px rgba(46, 229, 157, 0.25);
}

.tile.binary-mid {
    outline: 4px solid var(--gold);
    box-shadow: 0 0 26px rgba(247, 201, 72, 0.52);
}

.tile.binary-found,
.tile.bfs-visited {
    background: linear-gradient(145deg, #45f6b0, #159466);
    border-color: rgba(202, 255, 234, 0.64);
}

.tile.binary-found {
    outline: 4px solid #c8ffe8;
}

.tile.trace-expected {
    outline-style: dashed;
}

.buttons {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 2px;
}

button {
    min-height: 44px;
    padding: 12px 20px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 12px;
    background: linear-gradient(145deg, #48ddff, #2563eb);
    color: #04101f;
    font-weight: 900;
    cursor: pointer;
    font-size: 15px;
    transition: transform 0.18s ease, box-shadow 0.18s ease, filter 0.18s ease, opacity 0.18s ease;
    box-shadow: 0 10px 22px rgba(37, 99, 235, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

button:hover {
    transform: translateY(-2px);
    filter: brightness(1.08);
    box-shadow: 0 14px 28px rgba(56, 213, 255, 0.24);
}

#hintBtn {
    background: linear-gradient(145deg, #ffe27a, #f7a928);
}

#resetBtn {
    background: linear-gradient(145deg, #b999ff, #7c3aed);
    color: #ffffff;
}

#newPuzzleBtn,
#dailyChallengeBtn,
#loadCustomBtn,
#generateShareBtn {
    background: linear-gradient(145deg, #54e4ff, #2f65ff);
}

button:disabled,
.button-disabled {
    cursor: not-allowed;
    opacity: 0.62;
    transform: none;
    filter: grayscale(0.25);
}

.daily-challenge-panel,
.level-editor-panel,
.leaderboard-panel {
    padding: clamp(16px, 2.4vw, 22px);
    margin-top: 22px;
}

.daily-challenge-header,
.level-editor-panel .level-editor-row,
.leaderboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.daily-challenge-panel p {
    color: var(--muted);
    line-height: 1.55;
}

.daily-active {
    border-color: rgba(247, 201, 72, 0.72);
    box-shadow: 0 0 28px rgba(247, 201, 72, 0.14), inset 0 0 28px rgba(247, 201, 72, 0.04);
}

.level-editor-panel .level-editor-row {
    align-items: stretch;
}

.level-editor-panel .level-editor-row input,
.level-editor-panel .level-editor-row button {
    flex: 1;
    min-width: 0;
}

.level-editor-panel .level-editor-row input[readonly] {
    color: #d9e6ff;
    background: rgba(4, 8, 21, 0.72);
}

.clear-button {
    background: linear-gradient(145deg, #ff6b85, #c71f46);
    color: white;
    box-shadow: 0 10px 22px rgba(199, 31, 70, 0.24);
}

.clear-button:hover {
    background: linear-gradient(145deg, #ff7c94, #dc244f);
}

.leaderboard-table-wrapper {
    overflow-x: auto;
    border: 1px solid rgba(120, 159, 255, 0.16);
    border-radius: 14px;
    background: rgba(3, 7, 18, 0.42);
}

.leaderboard-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    min-width: 760px;
}

.leaderboard-table th,
.leaderboard-table td {
    padding: 12px 14px;
    text-align: center;
    border-bottom: 1px solid rgba(120, 159, 255, 0.14);
    color: var(--text);
}

.leaderboard-table th {
    position: sticky;
    top: 0;
    background: linear-gradient(180deg, rgba(19, 30, 66, 0.98), rgba(8, 13, 31, 0.98));
    color: #bfeeff;
    font-size: 12px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.leaderboard-table td {
    background: rgba(8, 13, 31, 0.62);
}

.leaderboard-table tr:nth-child(even) td {
    background: rgba(18, 27, 58, 0.58);
}

.leaderboard-table tr:hover td {
    background: rgba(56, 213, 255, 0.08);
}

.result-panel {
    background: linear-gradient(180deg, rgba(4, 8, 21, 0.98), rgba(12, 25, 43, 0.98));
    border: 1px solid rgba(46, 229, 157, 0.66);
    border-radius: 18px;
    padding: 22px;
    margin: 20px auto 24px;
    text-align: center;
    max-width: 440px;
    box-shadow: 0 0 36px rgba(46, 229, 157, 0.16);
    animation: popIn 0.3s ease;
}

.result-panel h2 {
    color: var(--green);
    margin-bottom: 12px;
}

.result-panel p {
    margin: 8px 0;
    font-size: 18px;
    color: var(--text);
}

.result-panel .stars {
    font-size: 34px;
    color: var(--gold);
    letter-spacing: 4px;
    margin-top: 14px;
    text-shadow: 0 0 18px rgba(247, 201, 72, 0.42);
}

.hidden {
    display: none;
}

@keyframes popIn {
    from {
        opacity: 0;
        transform: scale(0.92);
    }

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

@media (max-width: 820px) {
    .how-to-content,
    .modes ul,
    .top-bar,
    .stats {
        grid-template-columns: 1fr;
    }

    .hero-panel {
        min-height: 210px;
    }

    .message-box {
        align-items: flex-start;
        flex-direction: column;
        gap: 6px;
    }

    .message-box::before {
        margin-right: 0;
    }

    .daily-challenge-header,
    .leaderboard-header,
    .level-editor-panel .level-editor-row {
        align-items: stretch;
        flex-direction: column;
    }

    .daily-challenge-header button,
    .leaderboard-header button,
    .level-editor-panel .level-editor-row button {
        width: 100%;
    }
}

@media (max-width: 520px) {
    body {
        padding: 10px 0;
    }

    .app-container {
        width: min(100% - 14px, 1180px);
        border-radius: 18px;
        padding: 12px;
    }

    .hero-badges span {
        font-size: 12px;
        padding: 7px 10px;
    }

    .tile-board {
        grid-template-columns: repeat(auto-fit, minmax(30px, max-content));
        gap: 6px;
        padding: 12px;
    }

    .tile {
        width: 30px;
        height: 30px;
        font-size: 12px;
        border-radius: 8px;
    }

    .buttons button {
        flex: 1 1 100%;
    }
}

/* Simplified browser game layout */
.app-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.hero-panel {
    order: 1;
    min-height: auto;
    margin-bottom: 0;
    padding: 24px 18px;
    border-radius: 18px;
}

.hero-eyebrow {
    margin-bottom: 8px;
}

header h1 {
    font-size: clamp(38px, 6vw, 66px);
    margin-bottom: 8px;
}

header p {
    margin-bottom: 14px;
    font-size: clamp(15px, 1.9vw, 19px);
}

.hero-badges {
    gap: 8px;
}

.hero-badges span {
    min-height: 30px;
    padding: 6px 11px;
}

.game-panel {
    order: 2;
    max-width: 980px;
    width: 100%;
    margin: 0 auto;
    padding: clamp(16px, 2.4vw, 24px);
}

.how-to-play-panel {
    order: 3;
    max-width: 980px;
    width: 100%;
    margin: 0 auto;
    padding: 18px;
}

.how-to-play-panel h2 {
    margin-bottom: 12px;
    font-size: 20px;
}

.modes,
.controls {
    padding: 14px;
}

.how-to-play-panel li {
    font-size: 13px;
    line-height: 1.35;
}

.top-bar {
    grid-template-columns: minmax(220px, 1fr) minmax(220px, 1fr) 140px;
    gap: 10px;
    margin-bottom: 12px;
}

.control-field,
.level-box {
    padding: 10px;
}

select,
input {
    min-height: 38px;
}

.stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
    margin-bottom: 12px;
}

.stats div {
    min-height: 66px;
    padding: 10px 12px;
}

.stats small {
    margin-bottom: 4px;
}

.stats span {
    font-size: clamp(20px, 2.5vw, 26px);
}

.message-box {
    min-height: 46px;
    padding: 10px 12px;
    margin-bottom: 10px;
}

.pass-info {
    padding: 9px 12px;
    margin-bottom: 12px;
    font-size: 14px;
}

.tile-board {
    min-height: 112px;
    margin-bottom: 16px;
    padding: clamp(12px, 2vw, 20px);
    grid-template-columns: repeat(auto-fit, minmax(clamp(28px, 4.8vw, 58px), max-content));
}

.tile {
    width: clamp(28px, 4.8vw, 58px);
    height: clamp(28px, 4.8vw, 58px);
    font-size: clamp(11px, 1.8vw, 22px);
}

.buttons {
    margin-bottom: 4px;
}

button {
    min-height: 40px;
    padding: 10px 16px;
}

.daily-challenge-panel,
.level-editor-panel {
    display: inline-block;
    width: calc(50% - 7px);
    min-height: 150px;
    vertical-align: top;
    margin-top: 16px;
    padding: 16px;
}

.daily-challenge-panel {
    margin-right: 10px;
}

.daily-challenge-panel h2,
.level-editor-panel h2,
.leaderboard-header h2 {
    font-size: 19px;
    margin-bottom: 10px;
}

.leaderboard-panel {
    margin-top: 16px;
    padding: 16px;
}

.leaderboard-table th,
.leaderboard-table td {
    padding: 9px 10px;
    font-size: 14px;
}

.result-panel {
    margin: 14px auto 16px;
    padding: 18px;
}

@media (max-width: 900px) {
    .top-bar,
    .stats {
        grid-template-columns: 1fr 1fr;
    }

    .level-box {
        grid-column: 1 / -1;
    }

    .daily-challenge-panel,
    .level-editor-panel {
        display: block;
        width: 100%;
        min-height: auto;
        margin-right: 0;
    }
}

@media (max-width: 620px) {
    .app-container {
        gap: 12px;
    }

    .hero-panel {
        padding: 18px 12px;
    }

    .top-bar,
    .stats,
    .how-to-content,
    .modes ul {
        grid-template-columns: 1fr;
    }

    .message-box {
        align-items: center;
    }

    .message-box::before {
        margin-right: 0;
    }

    .tile-board {
        grid-template-columns: repeat(auto-fit, minmax(28px, max-content));
        gap: 6px;
        padding: 10px;
    }

    .tile {
        width: 28px;
        height: 28px;
        font-size: 11px;
        border-radius: 8px;
    }
}

/* Final game-theme cascade lock. */
.app-container { width: min(100% - 24px, 1160px); gap: 12px; padding: clamp(12px, 1.6vw, 20px); border-radius: 24px; }
.hero-panel { display: grid; grid-template-columns: minmax(0, 1fr) auto; min-height: 0; padding: 18px 24px; border-radius: 18px; text-align: left; }
.hero-eyebrow { margin-bottom: 3px; }
header h1 { margin-bottom: 0; font-size: clamp(34px, 5vw, 54px); }
header p { margin: 7px 0 0; font-size: clamp(12px, 1.45vw, 15px); }
.hero-badges { gap: 6px; }
.game-panel { max-width: 1060px; padding: clamp(14px, 2vw, 22px); }
.top-bar { grid-template-columns: minmax(190px, 1fr) minmax(190px, 1fr) 128px; gap: 8px; }
.control-field, .level-box { min-height: 62px; padding: 9px 11px; }
.stats { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 7px; }
.stats div { min-height: 58px; padding: 9px 12px 9px 39px; }
.stats span { font-size: clamp(18px, 2vw, 24px); }
.message-box { min-height: 48px; padding: 10px 14px 10px 128px; }
.pass-info { padding: 8px 12px; font-size: 12px; }
.tile-board { min-height: 120px; padding: 25px 18px; grid-template-columns: repeat(auto-fit, minmax(clamp(36px, 4.6vw, 58px), max-content)); }
.tile { width: clamp(36px, 4.6vw, 58px); height: clamp(40px, 4.6vw, 58px); font-size: clamp(14px, 1.7vw, 21px); border-radius: 12px; }
button { min-height: 40px; padding: 10px 16px; border-radius: 9px; }
.result-panel { width: min(100%, 660px); padding: 26px; }

@media (max-width: 900px) {
    .hero-panel { grid-template-columns: 1fr; }
    .top-bar, .stats { grid-template-columns: 1fr 1fr; }
    .level-box { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
    .app-container { width: min(100% - 10px, 1160px); padding: 8px; border-radius: 15px; }
    .hero-panel { grid-template-columns: 1fr; padding: 14px; border-radius: 13px; }
    header h1 { font-size: clamp(34px, 13vw, 46px); }
    .game-panel { padding: 11px; border-radius: 14px; }
    .top-bar { grid-template-columns: 1fr; }
    .level-box { grid-column: auto; }
    .stats { grid-template-columns: 1fr 1fr; }
    .message-box { min-height: 68px; padding: 35px 10px 10px; }
    .tile-board { min-height: 112px; padding: 25px 9px 21px; grid-template-columns: repeat(auto-fit, minmax(42px, max-content)); }
    .tile { min-width: 42px; min-height: 46px; width: 42px; height: 46px; font-size: 15px; }
    .result-panel { padding: 18px 10px; }
}