/* ---------- theme tokens ---------- */

:root {
    --bg: linear-gradient(160deg, #e0f2fe 0%, #ede9fe 55%, #fce7f3 100%);
    --surface: #ffffff;
    --surface-alt: #f1f5f9;
    --text: #1e293b;
    --muted: #64748b;
    --border: #e2e8f0;
    --accent: #6366f1;
    --accent-soft: #e0e7ff;
    --accent-text: #ffffff;
    --human: #6366f1;
    --computer: #ec4899;
    --win: #16a34a;
    --lose: #dc2626;
    --draw: #d97706;
    --shadow: 0 10px 30px rgba(30, 41, 59, 0.10);
    --radius: 18px;
    color-scheme: light;
}

:root[data-theme="dark"] {
    --bg: linear-gradient(160deg, #0f172a 0%, #1e1b4b 60%, #312e81 100%);
    --surface: #1e293b;
    --surface-alt: #0f172a;
    --text: #f1f5f9;
    --muted: #94a3b8;
    --border: #334155;
    --accent: #818cf8;
    --accent-soft: #312e81;
    --accent-text: #0f172a;
    --human: #818cf8;
    --computer: #f472b6;
    --win: #4ade80;
    --lose: #f87171;
    --draw: #fbbf24;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.40);
    color-scheme: dark;
}

/* ---------- base ---------- */

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 24px 16px;
    background: var(--bg);
    background-attachment: fixed;
    color: var(--text);
    font-family: "Poppins", system-ui, -apple-system, sans-serif;
    font-size: 1rem;
    line-height: 1.5;
}

p {
    margin: 0;
}

button {
    font: inherit;
    color: inherit;
    cursor: pointer;
}

button:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}

.game {
    width: 100%;
    max-width: 560px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    transition: background-color 0.3s, border-color 0.3s;
}

/* ---------- header ---------- */

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

.title {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.iconButton {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--surface);
    box-shadow: var(--shadow);
    font-size: 1.25rem;
}

/* ---------- 1. score board ---------- */

.scoreBoard {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    text-align: center;
}

.label {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
}

.score {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
}

.score.human {
    color: var(--human);
}

.score.computer {
    color: var(--computer);
}

.round,
.target {
    font-size: 0.875rem;
    color: var(--muted);
}

.vsText {
    font-size: 1.25rem;
    font-weight: 700;
}

/* ---------- 2. animation area ---------- */

.arena {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.timer {
    display: flex;
    align-items: center;
    gap: 12px;
}

.timerTrack {
    flex: 1;
    height: 8px;
    border-radius: 999px;
    background: var(--surface-alt);
    overflow: hidden;
}

.timerBar {
    width: 100%;
    height: 100%;
    border-radius: inherit;
    background: var(--accent);
    transition: width 50ms linear, background-color 0.2s;
}

.timerBar.urgent {
    background: var(--lose);
}

.timerText {
    min-width: 3.5ch;
    text-align: right;
    font-size: 0.875rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    color: var(--muted);
}

.hands {
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 180px;
    padding: 24px 32px;
    border-radius: 14px;
    background: var(--surface-alt);
}

.hand {
    font-size: clamp(4rem, 18vw, 6rem);
    line-height: 1;
}

.glyph {
    display: inline-block;
}

/* both hands point at each other */
.humanHand .glyph {
    transform: rotate(90deg);
}

.computerHand .glyph {
    transform: scaleX(-1) rotate(90deg);
}

.hand.idle {
    animation: bob 1.6s ease-in-out infinite;
}

.hand.shake {
    animation: pump 0.3s ease-in-out 3;
}

.hand.pop {
    animation: pop 0.35s ease-out;
}

.hand.timedOut {
    opacity: 0.35;
    filter: grayscale(1);
}

@keyframes bob {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

/* the "rock, paper, scissors" pump: hand goes up and comes down hard */
@keyframes pump {
    0% { transform: translateY(0); }
    45% { transform: translateY(-48px); }
    100% { transform: translateY(0); }
}

@keyframes pop {
    0% { transform: scale(0.7); }
    60% { transform: scale(1.15); }
    100% { transform: scale(1); }
}

/* ---------- 3. announcement ---------- */

.announcement {
    text-align: center;
    font-size: 1.25rem;
    font-weight: 600;
}

#resultArea {
    min-height: 1.5em;
}

#resultArea.win {
    color: var(--win);
}

#resultArea.lose,
#resultArea.timeout {
    color: var(--lose);
}

#resultArea.draw {
    color: var(--draw);
}

/* ---------- 4. selection ---------- */

.buttonArea {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.choice {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 16px 8px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow);
    font-size: 1rem;
    font-weight: 600;
    transition: transform 0.15s, border-color 0.15s, opacity 0.2s;
}

.choice:hover:not(:disabled) {
    transform: translateY(-3px);
    border-color: var(--accent);
}

.choice:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.choice.picked,
.choice.picked:disabled {
    opacity: 1;
    border-color: var(--accent);
    background: var(--accent-soft);
}

.choiceIcon {
    font-size: 2.25rem;
    line-height: 1.2;
}

kbd {
    font-family: inherit;
    font-size: 0.75rem;
    color: var(--muted);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0 6px;
}

/* ---------- 5. controls ---------- */

.controls {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.difficulty {
    display: flex;
    padding: 4px;
    border-radius: 999px;
    background: var(--surface-alt);
}

.level {
    border: none;
    background: transparent;
    padding: 8px 14px;
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--muted);
}

.level small {
    font-weight: 400;
    opacity: 0.75;
}

.level[aria-pressed="true"] {
    background: var(--surface);
    color: var(--accent);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}

.level:disabled {
    cursor: not-allowed;
}

.level:disabled:not([aria-pressed="true"]) {
    opacity: 0.5;
}

.primary {
    border: none;
    border-radius: 999px;
    padding: 12px 24px;
    background: var(--accent);
    color: var(--accent-text);
    font-size: 1rem;
    font-weight: 600;
    transition: filter 0.15s;
}

.primary:hover {
    filter: brightness(1.08);
}

/* ---------- small screens & reduced motion ---------- */

@media (max-width: 480px) {
    .title {
        font-size: 1.25rem;
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    .difficulty {
        justify-content: space-between;
    }

    .hands {
        padding: 24px 16px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .hand.idle,
    .hand.pop {
        animation: none;
    }
}