/* Chess Master – PlayMix Games */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;600;700;900&display=swap');

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

:root {
    --bg:       #080b18;
    --bg2:      #0e1228;
    --card:     #111827;
    --accent:   #4d79ff;
    --accent2:  #a78bfa;
    --gold:     #facc15;
    --light-sq: #e8d5b0;
    --dark-sq:  #8b6e44;
    --text:     #f1f5f9;
    --muted:    #64748b;
}

body {
    font-family: 'Outfit', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
}

.hidden { display: none !important; }

/* ─── MODE SCREEN ─────────────────────────────────────────────── */
.mode-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(ellipse at 50% 30%, #0f163a 0%, #080b18 70%);
}

.mode-box {
    text-align: center;
    padding: 40px 28px;
    max-width: 380px;
    width: 100%;
}

.chess-logo {
    font-size: 5rem;
    line-height: 1;
    margin-bottom: 12px;
    filter: drop-shadow(0 0 20px rgba(77,121,255,0.6));
    animation: float 3s ease-in-out infinite;
}
@keyframes float {
    0%,100%{ transform: translateY(0); }
    50%{ transform: translateY(-10px); }
}

.mode-box h1 {
    font-size: 2.4rem;
    font-weight: 900;
    background: linear-gradient(135deg, #4d79ff, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.mode-sub {
    color: var(--muted);
    margin-bottom: 32px;
    font-size: 1rem;
}

.mode-buttons {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.mode-btn {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 16px;
    color: var(--text);
    cursor: pointer;
    font-family: 'Outfit', sans-serif;
    transition: all 0.25s;
    text-align: left;
}
.mode-btn:hover {
    background: rgba(77,121,255,0.15);
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(77,121,255,0.2);
}
.mode-btn-primary {
    border-color: rgba(77,121,255,0.4);
    background: rgba(77,121,255,0.08);
}
.mode-btn-primary:hover {
    background: rgba(77,121,255,0.2);
}
.mode-icon { font-size: 2rem; }
.mode-btn strong { display: block; font-size: 1.05rem; font-weight: 700; }
.mode-btn small  { color: var(--muted); font-size: 0.85rem; }

/* ─── GAME SCREEN ─────────────────────────────────────────────── */
.game-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 60px 12px 120px;
    min-height: 100vh;
    gap: 10px;
}

/* HUD */
.chess-hud {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 500;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(8,11,24,0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(77,121,255,0.2);
}
.hud-left { display: flex; align-items: center; gap: 10px; }
.hud-right { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.chess-title { font-weight: 900; font-size: 1.1rem; color: var(--accent); letter-spacing: 0.5px; }
.mode-badge {
    font-size: 0.8rem; font-weight: 600;
    background: rgba(77,121,255,0.15);
    border: 1px solid rgba(77,121,255,0.3);
    color: var(--accent2);
    padding: 3px 10px;
    border-radius: 20px;
}
.turn-label {
    font-size: 0.9rem; font-weight: 700; color: var(--text);
    background: rgba(255,255,255,0.06);
    padding: 5px 12px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.1);
}
.turn-label.in-check-label {
    background: rgba(239,68,68,0.2);
    border-color: #ef4444;
    color: #f87171;
    animation: checkPulse 0.8s infinite alternate;
}
@keyframes checkPulse {
    from { box-shadow: none; }
    to   { box-shadow: 0 0 12px rgba(239,68,68,0.5); }
}

.chess-btn {
    font-family: 'Outfit', sans-serif;
    font-size: 0.85rem; font-weight: 700;
    padding: 6px 14px;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    color: #fff; border: none; border-radius: 20px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 12px rgba(77,121,255,0.3);
}
.chess-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 18px rgba(77,121,255,0.5); }
.chess-btn-ghost {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.2);
    box-shadow: none;
    color: var(--text);
}
.chess-btn-ghost:hover { background: rgba(255,255,255,0.08); box-shadow: none; }
.chess-btn-large { padding: 12px 32px; font-size: 1.05rem; border-radius: 30px; }

/* Captured pieces row */
.captured-row {
    display: flex;
    justify-content: space-between;
    width: 100%;
    max-width: 500px;
    gap: 10px;
    padding: 0 4px;
}
.captured-side {
    display: flex; align-items: center; gap: 6px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.07);
    border-radius: 10px;
    padding: 5px 10px;
    flex: 1;
    min-width: 0;
}
.cap-label { font-size: 0.7rem; color: var(--muted); white-space: nowrap; }
.cap-pieces { font-size: 1rem; letter-spacing: 1px; flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; }

/* ─── BOARD ───────────────────────────────────────────────────── */
.board-wrap { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.board-labels-top {
    display: grid;
    grid-template-columns: 18px repeat(8,1fr);
    width: min(90vw, 496px);
    font-size: 0.65rem;
    color: var(--muted);
    text-align: center;
    padding-left: 2px;
}
.board-with-ranks { display: flex; align-items: stretch; gap: 3px; }
.ranks-left, .ranks-right {
    display: flex; flex-direction: column;
    justify-content: space-around;
    font-size: 0.65rem; color: var(--muted);
    width: 16px; text-align: center;
}
.board-outer {
    position: relative;
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 0 0 2px rgba(77,121,255,0.25), 0 10px 40px rgba(0,0,0,0.6), 0 0 60px rgba(77,121,255,0.08);
}
.board {
    display: grid;
    grid-template-columns: repeat(8,1fr);
    grid-template-rows: repeat(8,1fr);
    width: min(90vw, 480px);
    height: min(90vw, 480px);
}

.square {
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    user-select: none;
    position: relative;
    transition: background 0.08s;
}
.square.light { background: var(--light-sq); }
.square.dark  { background: var(--dark-sq); }

.piece {
    font-size: clamp(1.4rem, 4.8vw, 2.6rem);
    line-height: 1;
    transition: transform 0.12s;
    pointer-events: none;
    display: block;
}
.piece-w { color: #fff; text-shadow: 0 1px 3px rgba(0,0,0,0.7), 0 0 8px rgba(255,255,255,0.3); }
.piece-b { color: #1a1a2e; text-shadow: 0 1px 2px rgba(255,255,255,0.15); }

/* Square states */
.square.selected { background: rgba(250,204,21,0.55) !important; }

.square.move-target::after {
    content: "";
    position: absolute;
    width: 30%; height: 30%;
    background: rgba(0,200,80,0.75);
    border-radius: 50%;
    box-shadow: 0 0 8px rgba(0,200,80,0.5);
}
.square.move-capture {
    background: rgba(220,50,50,0.35) !important;
    outline: 3px solid rgba(220,50,50,0.7);
    outline-offset: -3px;
}
.square.in-check {
    background: rgba(239,68,68,0.6) !important;
    animation: checkSq 0.7s infinite alternate;
}
@keyframes checkSq {
    from { background: rgba(239,68,68,0.5) !important; }
    to   { background: rgba(239,68,68,0.8) !important; box-shadow: inset 0 0 12px rgba(239,68,68,0.6); }
}
.square.last-move {
    outline: 3px solid rgba(250,204,21,0.7);
    outline-offset: -3px;
}
.square:hover:not(.selected) .piece { transform: scale(1.08); }

/* ─── PROMOTION ───────────────────────────────────────────────── */
.promotion-overlay {
    position: absolute; inset: 0;
    background: rgba(0,0,0,0.82);
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    gap: 12px; z-index: 20;
    backdrop-filter: blur(4px);
}
.promotion-overlay p { font-size: 1rem; font-weight: 700; color: var(--gold); }
.promotion-pieces { display: flex; gap: 10px; }
.promo-btn {
    display: flex; flex-direction: column; align-items: center; gap: 4px;
    width: 64px; padding: 10px 6px;
    background: rgba(255,255,255,0.06);
    border: 2px solid rgba(255,255,255,0.15);
    border-radius: 12px; cursor: pointer;
    transition: all 0.2s; color: white; font-family: 'Outfit', sans-serif;
}
.promo-btn span { font-size: 2rem; }
.promo-btn small { font-size: 0.65rem; color: var(--muted); }
.promo-btn:hover { background: rgba(77,121,255,0.25); border-color: var(--accent); transform: translateY(-3px); }

/* ─── DIFFICULTY ROW ─────────────────────────────────────────── */
.diff-row {
    width: 100%;
    max-width: 500px;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    padding: 8px 12px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.07);
    border-radius: 10px;
}
.diff-label-text { font-size: 0.8rem; color: var(--muted); font-weight: 600; white-space: nowrap; }
.diff-btn {
    font-family: 'Outfit', sans-serif;
    font-size: 0.8rem; font-weight: 700;
    padding: 5px 12px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 20px; cursor: pointer; color: var(--text);
    transition: all 0.2s;
}
.diff-btn:hover { background: rgba(77,121,255,0.2); border-color: var(--accent); }
.diff-btn.diff-active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    box-shadow: 0 0 10px rgba(77,121,255,0.4);
}
.diff-current { display: none; } /* hidden, only shown as label fallback */

/* ─── MOVE HISTORY ────────────────────────────────────────────── */
.move-history-wrap {
    width: 100%;
    max-width: 500px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.07);
    border-radius: 12px;
    overflow: hidden;
}
.move-history-label {
    font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 1px; color: var(--muted);
    padding: 8px 12px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    background: rgba(255,255,255,0.02);
}
.move-history {
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-height: 160px;
    overflow-y: auto;
    padding: 6px 8px;
}
.move-history::-webkit-scrollbar { width: 3px; }
.move-history::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }

/* Each move as a readable mini-card */
.mh-card {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 5px 8px;
    border-radius: 8px;
    font-size: 0.83rem;
    border-left: 3px solid transparent;
}
.mh-card-w {
    background: rgba(255,255,255,0.04);
    border-left-color: #d1d5db;
}
.mh-card-b {
    background: rgba(77,121,255,0.06);
    border-left-color: #4d79ff;
}
.mh-idx {
    font-size: 0.7rem; color: var(--muted);
    min-width: 18px; text-align: right;
}
.mh-badge {
    font-size: 0.72rem; font-weight: 700;
    white-space: nowrap;
    padding: 2px 7px;
    border-radius: 10px;
    background: rgba(255,255,255,0.07);
    color: var(--text);
}
.mh-text {
    color: #cbd5e1;
    font-size: 0.82rem;
    line-height: 1.3;
}

/* ─── GAME OVER ───────────────────────────────────────────────── */
.game-over-overlay {
    position: fixed; inset: 0;
    background: rgba(0,0,0,0.88);
    display: flex; align-items: center; justify-content: center;
    z-index: 5000; backdrop-filter: blur(14px);
}
.game-over-box {
    background: linear-gradient(145deg, #0f172a, #1e1b4b);
    border: 1px solid rgba(77,121,255,0.3);
    border-radius: 24px;
    padding: 40px 36px;
    text-align: center;
    max-width: 360px; width: 90%;
    box-shadow: 0 20px 60px rgba(0,0,0,0.7), 0 0 40px rgba(77,121,255,0.1);
}
.game-over-icon { font-size: 4rem; margin-bottom: 10px; }
.game-over-box h2 { font-size: 2rem; font-weight: 900; margin-bottom: 8px; color: var(--gold); }
.game-over-box p  { color: var(--muted); margin-bottom: 24px; font-size: 1.1rem; }

/* ─── INFO SECTIONS ───────────────────────────────────────────── */
.game-info {
    background: #07090f;
    padding: 40px 20px;
    border-top: 1px solid rgba(255,255,255,0.05);
}
.info-container {
    display: flex; flex-wrap: wrap; gap: 24px;
    max-width: 900px; margin: 0 auto;
}
.info-card {
    flex: 1 1 280px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.07);
    border-radius: 16px; padding: 24px;
}
.info-card h2 {
    font-size: 1.1rem; font-weight: 900; color: var(--accent);
    margin-bottom: 14px; text-transform: uppercase; letter-spacing: 0.5px;
}
.info-content p { color: #94a3b8; line-height: 1.7; margin-bottom: 10px; font-size: 0.91rem; }
.info-content ul { padding-left: 18px; color: #94a3b8; }
.info-content ul li { margin-bottom: 7px; line-height: 1.6; font-size: 0.91rem; }
.info-content strong { color: #e2e8f0; }

/* ─── RESPONSIVE ──────────────────────────────────────────────── */
@media (max-width: 520px) {
    .board { width: min(96vw, 360px); height: min(96vw, 360px); }
    .board-labels-top { width: min(94vw, 380px); font-size: 0.6rem; }
    .chess-title { font-size: 0.95rem; }
    .chess-btn { padding: 5px 10px; font-size: 0.78rem; }
    .turn-label { font-size: 0.8rem; }
    .game-screen { padding: 56px 8px 100px; }
}
@media (max-width: 380px) {
    .board { width: min(98vw, 300px); height: min(98vw, 300px); }
    .piece { font-size: clamp(1.1rem, 4vw, 1.8rem); }
    .chess-hud { padding: 6px 10px; }
}