/* ─── Fonts ─────────────────────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;600;700;900&family=Space+Mono:ital,wght@0,400;0,700;1,400&display=swap');

/* ─── Variables ──────────────────────────────────────────────────────────────── */
:root {
    --bg: #07070f;
    --surface: rgba(255, 255, 255, 0.04);
    --border: rgba(255, 255, 255, 0.08);
    --x-col: #ff2a6d;
    --x-glow: rgba(255, 42, 109, 0.35);
    --o-col: #05d9e8;
    --o-glow: rgba(5, 217, 232, 0.35);
    --text: #e0e0ff;
    --muted: rgba(224, 224, 255, 0.4);
    --grid-col: rgba(255, 255, 255, 0.06);
    --cell-size: 90px;
    --cell-font: 2.8rem;
    --radius: 14px;
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─── Reset ──────────────────────────────────────────────────────────────────── */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    outline: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input {
    font-family: inherit;
}

/* ─── Body ───────────────────────────────────────────────────────────────────── */
body {
    font-family: 'Orbitron', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    min-height: 100svh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    position: relative;
}

/* Dot-grid background */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: radial-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px);
    background-size: 32px 32px;
    pointer-events: none;
    z-index: 0;
}

/* Ambient glow blobs */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse 60% 40% at 15% 20%, rgba(255, 42, 109, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse 50% 35% at 85% 75%, rgba(5, 217, 232, 0.08) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

#app {
    position: relative;
    z-index: 1;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100svh;
    padding: 24px;
}

/* ─── Utility ────────────────────────────────────────────────────────────────── */
.hidden {
    display: none !important;
}

/* ─── Setup Screen ───────────────────────────────────────────────────────────── */
#setup-screen {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 100%;
    max-width: 420px;
}

.setup-title {
    text-align: center;
    font-size: clamp(2rem, 8vw, 3.4rem);
    font-weight: 900;
    letter-spacing: 0.12em;
    line-height: 1;
    background: linear-gradient(135deg, var(--x-col) 0%, var(--o-col) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: none;
    filter: drop-shadow(0 0 20px rgba(5, 217, 232, 0.3));
    margin-bottom: 8px;
}

.setup-subtitle {
    text-align: center;
    font-family: 'Space Mono', monospace;
    font-size: 0.7rem;
    letter-spacing: 0.3em;
    color: var(--muted);
    margin-top: -12px;
    margin-bottom: 8px;
}

/* ─── Setup Card ─────────────────────────────────────────────────────────────── */
.setup-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 20px;
    backdrop-filter: blur(12px);
}

.setup-label {
    font-size: 0.6rem;
    letter-spacing: 0.25em;
    color: var(--muted);
    margin-bottom: 12px;
    display: block;
}

/* ─── Player Radio ───────────────────────────────────────────────────────────── */
.radio-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.radio-group input[type="radio"] {
    display: none;
}

.radio-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px;
    border-radius: 10px;
    border: 1px solid var(--border);
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    color: var(--muted);
    transition: var(--transition);
    user-select: none;
}

.radio-label .symbol {
    font-size: 1.2rem;
    font-family: 'Space Mono', monospace;
    transition: var(--transition);
}

.radio-group input#pick-x:checked+.radio-label {
    border-color: var(--x-col);
    color: var(--x-col);
    background: var(--x-glow);
    box-shadow: 0 0 20px var(--x-glow), inset 0 0 20px rgba(255, 42, 109, 0.05);
}

.radio-group input#pick-x:checked+.radio-label .symbol {
    text-shadow: 0 0 12px var(--x-col);
    filter: drop-shadow(0 0 6px var(--x-col));
}

.radio-group input#pick-o:checked+.radio-label {
    border-color: var(--o-col);
    color: var(--o-col);
    background: var(--o-glow);
    box-shadow: 0 0 20px var(--o-glow), inset 0 0 20px rgba(5, 217, 232, 0.05);
}

.radio-group input#pick-o:checked+.radio-label .symbol {
    text-shadow: 0 0 12px var(--o-col);
    filter: drop-shadow(0 0 6px var(--o-col));
}

.radio-label:hover {
    border-color: rgba(255, 255, 255, 0.2);
    color: var(--text);
}

/* ─── Toggle Row ─────────────────────────────────────────────────────────────── */
.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.toggle-text {
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    color: var(--text);
    font-weight: 600;
}

.toggle-sub {
    font-size: 0.6rem;
    letter-spacing: 0.08em;
    color: var(--muted);
    font-family: 'Space Mono', monospace;
    font-style: italic;
}

/* Pill toggle switch */
.toggle-switch {
    position: relative;
    width: 52px;
    height: 28px;
    flex-shrink: 0;
}

.toggle-switch input {
    display: none;
}

.toggle-switch .slider {
    position: absolute;
    inset: 0;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: var(--transition);
}

.toggle-switch .slider::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--muted);
    transition: var(--transition);
}

.toggle-switch input:checked+.slider {
    background: var(--o-glow);
    border-color: var(--o-col);
    box-shadow: 0 0 12px var(--o-glow);
}

.toggle-switch input:checked+.slider::after {
    transform: translateX(24px);
    background: var(--o-col);
    box-shadow: 0 0 8px var(--o-col);
}

/* ─── Board Size Stepper ─────────────────────────────────────────────────────── */
.stepper {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
}

.stepper button {
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
    color: var(--muted);
    transition: var(--transition);
    flex-shrink: 0;
}

.stepper button:hover {
    color: var(--o-col);
    background: var(--o-glow);
}

.stepper button:active {
    background: rgba(5, 217, 232, 0.1);
}

.stepper input[type="number"] {
    flex: 1;
    text-align: center;
    background: none;
    border: none;
    color: var(--text);
    font-family: 'Space Mono', monospace;
    font-size: 1rem;
    font-weight: 700;
    -moz-appearance: textfield;
    appearance: textfield;
}

.stepper input[type="number"]::-webkit-inner-spin-button,
.stepper input[type="number"]::-webkit-outer-spin-button {
    display: none;
}

/* ─── Start Button ───────────────────────────────────────────────────────────── */
#start-btn {
    width: 100%;
    padding: 16px;
    border-radius: var(--radius);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.25em;
    color: var(--bg);
    background: linear-gradient(135deg, var(--x-col) 0%, var(--o-col) 100%);
    box-shadow: 0 0 24px rgba(5, 217, 232, 0.2), 0 4px 20px rgba(0, 0, 0, 0.4);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

#start-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--o-col) 0%, var(--x-col) 100%);
    opacity: 0;
    transition: var(--transition);
}

#start-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px rgba(5, 217, 232, 0.35), 0 8px 30px rgba(0, 0, 0, 0.5);
}

#start-btn:hover::before {
    opacity: 1;
}

#start-btn:active {
    transform: translateY(0);
}

#start-btn span {
    position: relative;
    z-index: 1;
}

/* ─── Game Screen ────────────────────────────────────────────────────────────── */
#game-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    width: 100%;
    max-width: min(600px, 95vw);
}

/* ─── Game Header ────────────────────────────────────────────────────────────── */
.game-header {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.turn-display {
    flex: 1;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px 16px;
    text-align: center;
}

.turn-text {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--muted);
    transition: color 0.3s;
}

.turn-text.player-x {
    color: var(--x-col);
    text-shadow: 0 0 10px var(--x-col);
}

.turn-text.player-o {
    color: var(--o-col);
    text-shadow: 0 0 10px var(--o-col);
}

.scores {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.score-chip {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 14px;
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    font-weight: 700;
    white-space: nowrap;
}

.score-chip .sym {
    font-family: 'Space Mono', monospace;
    font-size: 0.9rem;
}

.score-chip .num {
    font-family: 'Space Mono', monospace;
    font-size: 1rem;
}

.score-chip.x {
    border-color: rgba(255, 42, 109, 0.3);
    color: var(--x-col);
}

.score-chip.o {
    border-color: rgba(5, 217, 232, 0.3);
    color: var(--o-col);
}

/* ─── Icon Buttons ───────────────────────────────────────────────────────────── */
.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--muted);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: var(--transition);
    flex-shrink: 0;
}

.icon-btn:hover {
    border-color: var(--x-col);
    color: var(--x-col);
    box-shadow: 0 0 12px var(--x-glow);
}

/* ─── Grid ───────────────────────────────────────────────────────────────────── */
#grid {
    display: grid;
    gap: 8px;
    padding: 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    backdrop-filter: blur(8px);
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

/* ─── Cell ───────────────────────────────────────────────────────────────────── */
.cell {
    width: var(--cell-size);
    height: var(--cell-size);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--grid-col);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--cell-font);
    font-family: 'Space Mono', monospace;
    font-weight: 700;
    cursor: pointer;
    transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
    user-select: none;
}

.cell:empty:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.18);
    box-shadow: inset 0 0 20px rgba(255, 255, 255, 0.03);
}

/* X cell */
.cell.x {
    color: var(--x-col);
    border-color: rgba(255, 42, 109, 0.25);
    background: rgba(255, 42, 109, 0.06);
    text-shadow: 0 0 12px var(--x-col);
    cursor: default;
}

/* O cell */
.cell.o {
    color: var(--o-col);
    border-color: rgba(5, 217, 232, 0.25);
    background: rgba(5, 217, 232, 0.06);
    text-shadow: 0 0 12px var(--o-col);
    cursor: default;
}

/* Pop animation on placement */
@keyframes cellPop {
    0% {
        transform: scale(0.4);
        opacity: 0;
    }

    60% {
        transform: scale(1.15);
    }

    80% {
        transform: scale(0.95);
    }

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

.cell.pop {
    animation: cellPop 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* Win pulse */
@keyframes winPulse {

    0%,
    100% {
        box-shadow: 0 0 16px currentColor;
    }

    50% {
        box-shadow: 0 0 36px currentColor, inset 0 0 20px rgba(255, 255, 255, 0.06);
    }
}

.cell.win.x {
    border-color: var(--x-col) !important;
    background: rgba(255, 42, 109, 0.15) !important;
    animation: winPulse 1s ease-in-out infinite;
    color: var(--x-col);
}

.cell.win.o {
    border-color: var(--o-col) !important;
    background: rgba(5, 217, 232, 0.15) !important;
    animation: winPulse 1s ease-in-out infinite;
    color: var(--o-col);
}

/* Dim non-winning cells */
.cell.dim {
    opacity: 0.25;
}

/* ─── Game Footer ────────────────────────────────────────────────────────────── */
.game-footer {
    display: flex;
    gap: 10px;
    width: 100%;
}

.footer-btn {
    flex: 1;
    padding: 12px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--muted);
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition);
}

.footer-btn:hover {
    border-color: var(--o-col);
    color: var(--o-col);
    box-shadow: 0 0 16px var(--o-glow);
}

.footer-btn.danger:hover {
    border-color: var(--x-col);
    color: var(--x-col);
    box-shadow: 0 0 16px var(--x-glow);
}

/* ─── Modal ──────────────────────────────────────────────────────────────────── */
#modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(7, 7, 15, 0.85);
    backdrop-filter: blur(8px);
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

#modal.show {
    opacity: 1;
    pointer-events: all;
}

.modal-box {
    background: #0e0e1c;
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 36px 32px;
    text-align: center;
    max-width: 320px;
    width: 90%;
    box-shadow: 0 0 60px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.04);
    transform: translateY(20px) scale(0.95);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

#modal.show .modal-box {
    transform: translateY(0) scale(1);
}

#modal-icon {
    font-size: 3rem;
    font-family: 'Space Mono', monospace;
    display: block;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--x-col), var(--o-col));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 12px rgba(5, 217, 232, 0.5));
}

#modal-title {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.3em;
    color: var(--muted);
    margin-bottom: 8px;
}

#modal-message {
    font-family: 'Space Mono', monospace;
    font-size: 0.9rem;
    color: var(--text);
    margin-bottom: 24px;
    line-height: 1.5;
}

#modal-ok {
    width: 100%;
    padding: 13px;
    border-radius: 10px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.25em;
    color: var(--bg);
    background: linear-gradient(135deg, var(--x-col), var(--o-col));
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(5, 217, 232, 0.2);
}

#modal-ok:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 28px rgba(5, 217, 232, 0.35);
}

#modal-ok:active {
    transform: translateY(0);
}

/* ─── Responsive ─────────────────────────────────────────────────────────────── */
@media (max-width: 520px) {
    :root {
        --cell-size: 70px;
        --cell-font: 2.2rem;
    }

    .game-header {
        flex-wrap: wrap;
    }

    .scores {
        order: 3;
        width: 100%;
        justify-content: center;
    }

    .turn-display {
        flex: 1;
    }

    .score-chip {
        padding: 6px 10px;
        font-size: 0.6rem;
    }

    #grid {
        padding: 10px;
        gap: 5px;
    }

    .setup-title {
        font-size: 2rem;
    }
}

@media (max-width: 360px) {
    :root {
        --cell-size: 58px;
        --cell-font: 1.7rem;
    }

    #grid {
        gap: 4px;
        padding: 8px;
    }
}