:root {
    --page-bg: #0b1220;
    --page-bg-soft: #111c31;
    --orb-1: rgba(96, 165, 250, 0.18);
    --orb-2: rgba(244, 114, 182, 0.14);
    --grid-line: rgba(255, 255, 255, 0.05);
    --panel: #121b2d;
    --panel-alt: #172338;
    --panel-border: #26344e;
    --text: #f8fafc;
    --muted: #97a6bf;
    --button-bg: #f8fafc;
    --button-text: #0f172a;
    --button-secondary: #1c2740;
    --button-secondary-text: #e5edf9;
    --shadow: 0 24px 60px rgba(2, 6, 23, 0.42);
    --overlay-bg: rgba(4, 10, 21, 0.74);
    --court: #0b1321;
    --court-line: rgba(255, 255, 255, 0.18);
    --court-edge: rgba(255, 255, 255, 0.08);
    --left-accent: #7dd3fc;
    --right-accent: #fb7185;
    --ball-accent: #facc15;
}

body[data-theme="midnight"] {
    --page-bg: #0b1220;
    --page-bg-soft: #111c31;
    --orb-1: rgba(96, 165, 250, 0.18);
    --orb-2: rgba(244, 114, 182, 0.14);
    --grid-line: rgba(255, 255, 255, 0.05);
    --panel: #121b2d;
    --panel-alt: #172338;
    --panel-border: #26344e;
    --text: #f8fafc;
    --muted: #97a6bf;
    --button-bg: #f8fafc;
    --button-text: #0f172a;
    --button-secondary: #1c2740;
    --button-secondary-text: #e5edf9;
    --overlay-bg: rgba(4, 10, 21, 0.74);
    --court: #0b1321;
    --court-line: rgba(255, 255, 255, 0.18);
    --court-edge: rgba(255, 255, 255, 0.08);
    --left-accent: #7dd3fc;
    --right-accent: #fb7185;
    --ball-accent: #facc15;
}

body[data-theme="paper"] {
    --page-bg: #f4eee4;
    --page-bg-soft: #eadfce;
    --orb-1: rgba(59, 130, 246, 0.14);
    --orb-2: rgba(217, 119, 6, 0.12);
    --grid-line: rgba(61, 52, 44, 0.06);
    --panel: #fff9ef;
    --panel-alt: #f6eddf;
    --panel-border: #d7c8b4;
    --text: #2e241d;
    --muted: #7d6f64;
    --button-bg: #2e241d;
    --button-text: #fff9ef;
    --button-secondary: #ede1d0;
    --button-secondary-text: #2e241d;
    --overlay-bg: rgba(39, 29, 20, 0.56);
    --court: #fffaf3;
    --court-line: rgba(46, 36, 29, 0.18);
    --court-edge: rgba(46, 36, 29, 0.06);
    --left-accent: #2563eb;
    --right-accent: #dc2626;
    --ball-accent: #d97706;
}

body[data-theme="coral"] {
    --page-bg: #1b1017;
    --page-bg-soft: #311721;
    --orb-1: rgba(249, 115, 22, 0.16);
    --orb-2: rgba(251, 113, 133, 0.14);
    --grid-line: rgba(255, 237, 237, 0.05);
    --panel: #24131a;
    --panel-alt: #321920;
    --panel-border: #53303b;
    --text: #fff5f3;
    --muted: #e4b0ab;
    --button-bg: #ffe6de;
    --button-text: #45161a;
    --button-secondary: #3a2027;
    --button-secondary-text: #fff5f3;
    --overlay-bg: rgba(24, 8, 12, 0.74);
    --court: #261218;
    --court-line: rgba(255, 228, 221, 0.18);
    --court-edge: rgba(255, 228, 221, 0.07);
    --left-accent: #f97316;
    --right-accent: #fb7185;
    --ball-accent: #fde68a;
}

body[data-theme="mint"] {
    --page-bg: #071914;
    --page-bg-soft: #0d2d24;
    --orb-1: rgba(52, 211, 153, 0.16);
    --orb-2: rgba(45, 212, 191, 0.12);
    --grid-line: rgba(236, 253, 245, 0.05);
    --panel: #0d211c;
    --panel-alt: #123028;
    --panel-border: #20453c;
    --text: #ecfdf5;
    --muted: #9bd5c0;
    --button-bg: #d1fae5;
    --button-text: #073528;
    --button-secondary: #17372d;
    --button-secondary-text: #ecfdf5;
    --overlay-bg: rgba(3, 17, 13, 0.74);
    --court: #071d18;
    --court-line: rgba(209, 250, 229, 0.18);
    --court-edge: rgba(209, 250, 229, 0.07);
    --left-accent: #34d399;
    --right-accent: #2dd4bf;
    --ball-accent: #fef08a;
}

body[data-theme="mono"] {
    --page-bg: #080808;
    --page-bg-soft: #171717;
    --orb-1: rgba(255, 255, 255, 0.09);
    --orb-2: rgba(163, 163, 163, 0.12);
    --grid-line: rgba(255, 255, 255, 0.05);
    --panel: #111111;
    --panel-alt: #181818;
    --panel-border: #2a2a2a;
    --text: #f5f5f5;
    --muted: #a3a3a3;
    --button-bg: #fafafa;
    --button-text: #101010;
    --button-secondary: #1d1d1d;
    --button-secondary-text: #f5f5f5;
    --overlay-bg: rgba(8, 8, 8, 0.78);
    --court: #0f0f0f;
    --court-line: rgba(255, 255, 255, 0.16);
    --court-edge: rgba(255, 255, 255, 0.06);
    --left-accent: #ffffff;
    --right-accent: #7f7f7f;
    --ball-accent: #d4d4d4;
}

body[data-theme="arcade"] {
    --page-bg: #13061e;
    --page-bg-soft: #230a41;
    --orb-1: rgba(34, 211, 238, 0.16);
    --orb-2: rgba(244, 114, 182, 0.14);
    --grid-line: rgba(248, 244, 255, 0.05);
    --panel: #180826;
    --panel-alt: #23103a;
    --panel-border: #3c1d5f;
    --text: #f8f4ff;
    --muted: #cbb7ff;
    --button-bg: #f5d0fe;
    --button-text: #26053f;
    --button-secondary: #2b1345;
    --button-secondary-text: #f8f4ff;
    --overlay-bg: rgba(14, 3, 22, 0.76);
    --court: #180425;
    --court-line: rgba(248, 244, 255, 0.18);
    --court-edge: rgba(248, 244, 255, 0.06);
    --left-accent: #22d3ee;
    --right-accent: #f472b6;
    --ball-accent: #a3e635;
}

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

body {
    position: relative;
    min-height: 100vh;
    overflow-x: hidden;
    font-family: "Avenir Next", "Segoe UI", sans-serif;
    color: var(--text);
    background: linear-gradient(180deg, var(--page-bg) 0%, var(--page-bg-soft) 100%);
    padding: 24px;
}

body::before,
body::after {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
}

body::before {
    background:
        radial-gradient(circle at 14% 8%, var(--orb-1), transparent 30%),
        radial-gradient(circle at 84% 10%, var(--orb-2), transparent 24%);
}

body::after {
    background-image:
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 88%);
}

button,
input {
    font: inherit;
}

.app {
    position: relative;
    z-index: 1;
    max-width: 980px;
    margin: 0 auto;
    display: grid;
    gap: 18px;
}

.topbar,
.panel,
.hud-card,
.canvas-shell {
    position: relative;
    overflow: hidden;
    background: linear-gradient(180deg, var(--panel) 0%, var(--panel-alt) 100%);
    border: 1px solid var(--panel-border);
    box-shadow: var(--shadow);
}

.topbar::before,
.panel::before,
.hud-card::before,
.canvas-shell::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--left-accent), var(--ball-accent), var(--right-accent));
}

.topbar,
.panel,
.hud-card {
    border-radius: 24px;
}

.topbar {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 18px;
    align-items: start;
    padding: 24px;
}

.brand-block {
    display: grid;
    gap: 10px;
}

.eyebrow,
.hud-label,
.overlay-eyebrow,
.field-label {
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.16em;
    font-size: 0.72rem;
}

h1 {
    font-size: clamp(2.6rem, 5vw, 4rem);
    line-height: 0.95;
    letter-spacing: 0.08em;
}

.theme-toolbar {
    display: grid;
    gap: 10px;
    justify-items: end;
}

.theme-picker {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 8px;
    max-width: 420px;
}

.theme-chip {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-height: 40px;
    padding: 0 12px;
    border: 1px solid var(--panel-border);
    border-radius: 999px;
    background: var(--button-secondary);
    color: var(--muted);
    cursor: pointer;
    transition: transform 0.15s ease, border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}

.theme-chip:hover {
    transform: translateY(-1px);
    border-color: var(--left-accent);
    color: var(--text);
}

.theme-chip.is-active {
    background: var(--button-bg);
    color: var(--button-text);
    border-color: transparent;
}

.theme-chip-swatch {
    width: 10px;
    height: 10px;
    border-radius: 999px;
    background: var(--swatch);
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.08);
}

.panel {
    padding: 22px;
}

.lobby {
    display: grid;
    gap: 18px;
}

.mode-switch {
    display: inline-grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    padding: 6px;
    background: var(--button-secondary);
    border: 1px solid var(--panel-border);
    border-radius: 18px;
    width: fit-content;
}

.mode-button,
.primary-button,
.secondary-button {
    min-height: 50px;
    border: 1px solid transparent;
    border-radius: 14px;
    cursor: pointer;
    transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.mode-button {
    padding: 0 16px;
    background: transparent;
    color: var(--muted);
}

.mode-button.is-active {
    background: var(--button-bg);
    color: var(--button-text);
}

.primary-button {
    padding: 0 18px;
    background: var(--button-bg);
    color: var(--button-text);
    font-weight: 700;
}

.secondary-button {
    padding: 0 18px;
    background: var(--button-secondary);
    border-color: var(--panel-border);
    color: var(--button-secondary-text);
}

.mode-button:hover,
.primary-button:hover,
.secondary-button:hover {
    transform: translateY(-1px);
}

.primary-button:disabled,
.secondary-button:disabled,
.mode-button:disabled,
input:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.helper-text,
.controls-note {
    color: var(--muted);
    line-height: 1.6;
}

.mode-panel {
    display: grid;
    gap: 14px;
}

.online-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.join-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px;
}

input {
    width: 100%;
    min-width: 0;
    min-height: 50px;
    padding: 0 14px;
    border: 1px solid var(--panel-border);
    border-radius: 14px;
    outline: none;
    background: rgba(0, 0, 0, 0.08);
    color: var(--text);
    text-transform: uppercase;
}

input::placeholder {
    color: var(--muted);
}

input:focus {
    border-color: var(--left-accent);
}

.badge-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.badge {
    display: inline-flex;
    align-items: center;
    min-height: 38px;
    padding: 0 14px;
    border-radius: 999px;
    background: var(--button-secondary);
    border: 1px solid var(--panel-border);
    color: var(--button-secondary-text);
}

.hud {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr) 220px;
    gap: 14px;
}

.hud-card {
    padding: 20px 22px;
    display: grid;
    gap: 8px;
}

.score-card:first-child .hud-value {
    color: var(--left-accent);
}

.score-card:last-child .hud-value {
    color: var(--right-accent);
}

.hud-value,
.status-value {
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    font-weight: 700;
}

.status-card {
    align-content: center;
    text-align: center;
}

.board-panel {
    display: grid;
}

.canvas-shell {
    border-radius: 28px;
    padding: 14px;
}

#gameCanvas {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 20px;
    border: 1px solid var(--panel-border);
    background: var(--court);
    touch-action: none;
}

.overlay {
    position: absolute;
    inset: 14px;
    display: grid;
    place-items: center;
    text-align: center;
    padding: 28px;
    border-radius: 20px;
    background: var(--overlay-bg);
}

.overlay.is-hidden,
.is-hidden {
    display: none;
}

.overlay-title {
    font-size: clamp(1.9rem, 4vw, 2.8rem);
    margin: 10px 0 12px;
}

.overlay-message {
    max-width: 520px;
    margin: 0 auto 20px;
    color: var(--muted);
    line-height: 1.6;
}

.controls-note {
    text-align: center;
}

@media (max-width: 900px) {
    .topbar {
        grid-template-columns: 1fr;
    }

    .theme-toolbar,
    .theme-picker {
        justify-items: start;
        justify-content: flex-start;
    }

    .hud {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 680px) {
    body {
        padding: 14px;
    }

    .topbar,
    .panel,
    .hud-card {
        border-radius: 20px;
    }

    .mode-switch {
        width: 100%;
    }

    .online-actions,
    .join-row {
        grid-template-columns: 1fr;
    }

    .theme-picker {
        max-width: none;
    }
}