/* ── Design tokens ────────────────────────────────────────── */
:root {
    --color-bg: #050510;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-strong: rgba(155, 109, 255, 0.35);
    --color-text: #f4f4fa;
    --color-text-muted: #9ca3af;
    --color-text-dim: #6b7280;

    --color-primary: #9b6dff;
    --color-primary-bright: #c4a8ff;
    --color-primary-dim: #b894ff;
    --color-secondary: #ffd54f;
    --color-danger: #ff5c6a;
    --color-danger-dim: #ff9aa3;
    --color-warning: #f5a623;

    --glass-bg: rgba(12, 12, 24, 0.75);
    --glass-inset: rgba(255, 255, 255, 0.06);
    --glass-inset-hover: rgba(255, 255, 255, 0.08);
    --panel-bg-soft: rgba(255, 255, 255, 0.03);
    --panel-bg-stat: rgba(0, 0, 0, 0.25);
    --btn-secondary-bg: rgba(155, 109, 255, 0.08);
    --btn-secondary-bg-hover: rgba(155, 109, 255, 0.14);
    --btn-secondary-border: rgba(155, 109, 255, 0.35);
    --badge-primary-bg: rgba(155, 109, 255, 0.12);
    --badge-primary-border: rgba(155, 109, 255, 0.25);
    --badge-danger-bg: rgba(255, 92, 106, 0.1);
    --badge-danger-border: rgba(255, 92, 106, 0.25);
    --panel-danger-border: rgba(255, 92, 106, 0.2);
    --panel-danger-glow: rgba(255, 92, 106, 0.08);
    --score-glow: rgba(155, 109, 255, 0.25);
    --best-glow: rgba(255, 213, 79, 0.35);
    --btn-danger-shadow: rgba(255, 92, 106, 0.25);
    --color-white: #fff;

    --gradient-primary: linear-gradient(135deg, #7c4dff 0%, #b388ff 50%, #9b6dff 100%);
    --gradient-danger: linear-gradient(135deg, #e53935 0%, #ff5c6a 100%);
    --gradient-panel: linear-gradient(160deg, rgba(18, 18, 32, 0.96) 0%, rgba(8, 8, 18, 0.98) 100%);
    --gradient-hud: linear-gradient(180deg, rgba(5, 5, 16, 0.72) 0%, rgba(5, 5, 16, 0) 100%);

    --shadow-primary: 0 0 24px rgba(155, 109, 255, 0.35);
    --shadow-primary-soft: 0 4px 24px rgba(155, 109, 255, 0.18);
    --shadow-danger: 0 0 24px rgba(255, 92, 106, 0.35);
    --shadow-panel: 0 24px 64px rgba(0, 0, 0, 0.55), 0 0 0 1px var(--color-border);
    --shadow-btn: 0 8px 24px rgba(0, 0, 0, 0.35);

    --overlay-backdrop: rgba(3, 3, 12, 0.62);
    --overlay-backdrop-danger: rgba(20, 4, 8, 0.72);

    --speed-line-bg-1: rgba(0, 0, 0, 0.25);
    --speed-line-bg-2: rgba(0, 0, 0, 0.4);
    --speed-line-bg-3: rgba(0, 0, 0, 0.55);

    --font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;

    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-pill: 999px;

    --transition-fast: 0.18s ease;
    --transition-screen: 0.42s cubic-bezier(0.4, 0, 0.2, 1);
    --z-canvas-fx: 5;
    --z-hud: 20;
    --z-modal: 50;
    --z-mobile-gate: 100;

    /* Responsive scale tokens (overridden per breakpoint) */
    --space-modal: 1.25rem;
    --panel-max-width: 22rem;
    --panel-padding-y: 2rem;
    --panel-padding-x: 1.75rem;
    --title-size: 2.35rem;
    --title-size-danger: 2rem;
    --logo-max-width: 14.5rem;
    --logo-margin-bottom: 0.5rem;
    --tagline-size: 0.9rem;
    --footer-size: 0.72rem;
    --hud-padding-y: 0.85rem;
    --hud-padding-x: 1rem;
    --hud-btn-size: 2.75rem;
    --hud-btn-icon-size: 1.2rem;
    --hud-score-min-width: 5rem;
    --hud-score-padding-y: 0.45rem;
    --hud-score-padding-x: 0.85rem;
    --hud-score-label-size: 0.625rem;
    --hud-score-value-size: 1.35rem;
    --stat-value-size: 2.5rem;
    --btn-font-size: 0.85rem;
    --btn-padding-y: 0.95rem;
    --btn-padding-x: 1.5rem;
    --tips-gap: 0.65rem;
    --tip-card-padding-y: 0.75rem;
    --tip-card-padding-x: 0.5rem;
    --tip-key-size: 0.7rem;
    --tip-text-size: 0.8rem;
    --badge-size: 0.65rem;
    --device-icon-size: 3.5rem;

    /* Canvas palette (read by script.js) */
    --canvas-stars: #ffffff;
    --canvas-violet: var(--color-primary);
    --canvas-grey-dark: #4a4a58;
    --canvas-grapple-line: #7a7a8a;
    --canvas-lava-spark: #ff6b3d;
    --canvas-hook-core: var(--color-primary);
    --canvas-hook-inner: var(--color-primary-dim);
    --canvas-hook-glow: rgba(155, 109, 255, 0.35);
    --canvas-hook-ray: var(--color-primary);
    --canvas-hook-target: rgba(155, 109, 255, 0.55);
    --canvas-lava-surface: #c43e12;
    --canvas-lava-flow: #ff6b1a;
    --canvas-lava-core: #ffaa33;
    --canvas-lava-bubble-0: rgba(255, 180, 60, 0.5);
    --canvas-lava-bubble-1: rgba(255, 80, 20, 0.2);
    --canvas-lava-bubble-2: rgba(200, 40, 10, 0);
    --canvas-stickman: #ffffff;
    --canvas-platform: var(--color-warning);
    --canvas-platform-glow: rgba(245, 166, 35, 0.15);
    --canvas-coin: var(--color-secondary);
    --canvas-coin-glow: rgba(255, 213, 79, 0.4);
    --canvas-coin-outline: #000000;
}

/* ── Reset & base ─────────────────────────────────────────── */
html,
body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-bg);
    font-family: var(--font-family);
    overflow: hidden;
    touch-action: none;
    user-select: none;
    -webkit-user-select: none;
    -webkit-font-smoothing: antialiased;
}

.app {
    position: relative;
    color: var(--color-text);
}

/* ── Canvas & overlays ────────────────────────────────────── */
.game-canvas {
    display: block;
    width: 100%;
    height: 100%;
}

.speed-lines {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast);
    z-index: var(--z-canvas-fx);
}

.speed-lines[data-level='1'] { opacity: 0.15; background: var(--speed-line-bg-1); }
.speed-lines[data-level='2'] { opacity: 0.3; background: var(--speed-line-bg-2); }
.speed-lines[data-level='3'] { opacity: 0.45; background: var(--speed-line-bg-3); }

/* ── Utilities ────────────────────────────────────────────── */
.is-hidden {
    display: none !important;
}

.is-transparent {
    opacity: 0;
    pointer-events: none;
}

/* ── HUD ──────────────────────────────────────────────────── */
.hud {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    padding: var(--hud-padding-y) var(--hud-padding-x);
    z-index: var(--z-hud);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast);
    background: var(--gradient-hud);
}

.hud--visible {
    opacity: 1;
    pointer-events: auto;
}

.hud-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--hud-btn-size);
    height: var(--hud-btn-size);
    touch-action: manipulation;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    padding: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--color-primary-bright);
    box-shadow: var(--shadow-btn), inset 0 1px 0 var(--glass-inset);
    transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.hud-btn:hover {
    border-color: var(--color-border-strong);
    box-shadow: var(--shadow-primary-soft), inset 0 1px 0 var(--glass-inset-hover);
    transform: translateY(-1px);
}

.hud-btn:active {
    transform: scale(0.94);
}

.hud-btn__icon {
    width: var(--hud-btn-icon-size);
    height: var(--hud-btn-icon-size);
}

.hud-score {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.1rem;
    min-width: var(--hud-score-min-width);
    padding: var(--hud-score-padding-y) var(--hud-score-padding-x);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--shadow-btn), inset 0 1px 0 var(--glass-inset);
}

.hud-score__label {
    font-size: var(--hud-score-label-size);
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--color-text-dim);
}

.hud-score__value {
    margin: 0;
    font-size: var(--hud-score-value-size);
    font-weight: 800;
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.02em;
    color: var(--color-text);
    text-shadow: 0 0 20px var(--score-glow);
}

/* ── Modal system ─────────────────────────────────────────── */
.modal {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-modal);
    z-index: var(--z-modal);
    opacity: 1;
    transition: opacity var(--transition-screen);
}

.modal__backdrop {
    position: absolute;
    inset: 0;
    background: var(--overlay-backdrop);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.modal__backdrop--danger {
    background: var(--overlay-backdrop-danger);
}

.modal__panel {
    position: relative;
    z-index: 1;
    width: min(100%, var(--panel-max-width));
    padding: var(--panel-padding-y) var(--panel-padding-x) calc(var(--panel-padding-y) - 0.25rem);
    border-radius: var(--radius-lg);
    background: var(--gradient-panel);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-panel);
    text-align: center;
    transform: scale(1) translateY(0);
    transition: transform var(--transition-screen), opacity var(--transition-screen);
}

.modal.is-transparent .modal__panel {
    transform: scale(0.94) translateY(12px);
    opacity: 0;
}

.modal__panel--danger {
    border-color: var(--panel-danger-border);
    box-shadow: var(--shadow-panel), 0 0 40px var(--panel-danger-glow);
}

.modal__badge {
    display: inline-block;
    margin-bottom: 0.75rem;
    padding: 0.3rem 0.75rem;
    border-radius: var(--radius-pill);
    font-size: var(--badge-size);
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--color-primary-bright);
    background: var(--badge-primary-bg);
    border: 1px solid var(--badge-primary-border);
}

.modal__badge--danger {
    color: var(--color-danger-dim);
    background: var(--badge-danger-bg);
    border-color: var(--badge-danger-border);
}

.modal__title {
    margin: 0 0 0.5rem;
    font-family: var(--font-family);
    font-size: var(--title-size);
    font-weight: 900;
    font-style: italic;
    letter-spacing: -0.03em;
    line-height: 1.05;
    color: var(--color-primary-bright);
    text-shadow: var(--shadow-primary);
}

.modal__logo-wrap {
    margin: 0 0 var(--logo-margin-bottom);
    line-height: 0;
}

.modal__logo {
    display: block;
    width: 100%;
    max-width: var(--logo-max-width);
    height: auto;
    margin: 0 auto;
    object-fit: contain;
}

.modal__title--danger {
    font-size: var(--title-size-danger);
    font-style: normal;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-danger);
    text-shadow: var(--shadow-danger);
}

.modal__tagline {
    margin: 0 0 1.5rem;
    font-size: var(--tagline-size);
    line-height: 1.5;
    color: var(--color-text-muted);
}

.modal__instructions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--tips-gap);
    margin-bottom: 1.5rem;
}

.tip-card {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: var(--tip-card-padding-y) var(--tip-card-padding-x);
    border-radius: var(--radius-md);
    background: var(--panel-bg-soft);
    border: 1px solid var(--color-border);
}

.tip-card__key {
    font-size: var(--tip-key-size);
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-primary-dim);
}

.tip-card__key--gold {
    color: var(--color-secondary);
}

.tip-card__text {
    font-size: var(--tip-text-size);
    color: var(--color-text-muted);
}

.modal__actions {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.modal__footer {
    margin: 1.25rem 0 0;
    font-size: var(--footer-size);
    color: var(--color-text-dim);
    letter-spacing: 0.02em;
}

/* ── Stat card (game over) ────────────────────────────────── */
.stat-card {
    margin-bottom: 1.5rem;
    padding: 1.1rem 1rem;
    border-radius: var(--radius-md);
    background: var(--panel-bg-stat);
    border: 1px solid var(--color-border);
}

.stat-card__label {
    margin: 0 0 0.35rem;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--color-danger-dim);
}

.stat-card__value {
    margin: 0;
    font-size: var(--stat-value-size);
    font-weight: 900;
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.stat-card__value--best {
    color: var(--color-secondary);
    text-shadow: 0 0 24px var(--best-glow);
}

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
    width: 100%;
    padding: var(--btn-padding-y) var(--btn-padding-x);
    border-radius: var(--radius-pill);
    border: none;
    font-family: inherit;
    font-size: var(--btn-font-size);
    touch-action: manipulation;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
}

.btn:active {
    transform: scale(0.97);
}

.btn--primary {
    color: var(--color-white);
    background: var(--gradient-primary);
    box-shadow: var(--shadow-primary-soft), var(--shadow-btn);
}

.btn--primary:hover {
    filter: brightness(1.08);
    box-shadow: var(--shadow-primary), var(--shadow-btn);
}

.btn--secondary {
    color: var(--color-primary-bright);
    background: var(--btn-secondary-bg);
    border: 1px solid var(--btn-secondary-border);
    box-shadow: var(--shadow-btn);
}

.btn--secondary:hover {
    background: var(--btn-secondary-bg-hover);
}

.btn--danger {
    color: var(--color-white);
    background: var(--gradient-danger);
    box-shadow: 0 8px 24px var(--btn-danger-shadow), var(--shadow-btn);
}

.btn--danger:hover {
    filter: brightness(1.06);
}

/* ── Mobile block overlay ─────────────────────────────────── */
.modal--mobile-block {
    z-index: var(--z-mobile-gate);
}

.modal__backdrop--mobile {
    background: rgba(3, 3, 12, 0.88);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.modal__panel--mobile-block {
    width: min(100%, var(--panel-max-width));
}

.modal__device-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--device-icon-size);
    height: var(--device-icon-size);
    margin: 0 auto 1rem;
    color: var(--color-primary-bright);
    filter: drop-shadow(0 0 16px var(--score-glow));
}

.modal__device-icon svg {
    width: 100%;
    height: 100%;
}

.modal__title--mobile-block {
    font-size: var(--title-size);
    font-style: normal;
    letter-spacing: -0.02em;
}

.modal__tagline--mobile-block {
    margin-bottom: 0;
    max-width: 22ch;
    margin-inline: auto;
}

.app--mobile-blocked .game-canvas,
.app--mobile-blocked .speed-lines,
.app--mobile-blocked .hud,
.app--mobile-blocked .modal:not(.modal--mobile-block) {
    visibility: hidden;
    pointer-events: none;
}

.app--mobile-blocked .modal--mobile-block {
    visibility: visible;
    pointer-events: auto;
}

/* ── Responsive breakpoints ───────────────────────────────── */
/* Desktop (≥1025px) — defaults in :root */

@media (max-width: 640px) {
    .modal__instructions {
        grid-template-columns: 1fr;
    }
}

/* Tablet Landscape (769px – 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
    :root {
        --space-modal: 1.35rem;
        --panel-max-width: 25rem;
        --panel-padding-y: 2.1rem;
        --panel-padding-x: 1.9rem;
        --title-size: 2.65rem;
        --title-size-danger: 1.9rem;
        --logo-max-width: 17.5rem;
        --tagline-size: 0.88rem;
        --hud-padding-y: 1rem;
        --hud-padding-x: 1.2rem;
        --hud-btn-size: 2.65rem;
        --hud-score-value-size: 1.5rem;
        --stat-value-size: 2.35rem;
        --btn-font-size: 0.82rem;
        --device-icon-size: 3.25rem;
    }
}

/* Tablet Portrait (641px – 768px) */
@media (min-width: 641px) and (max-width: 768px) {
    :root {
        --space-modal: 1.15rem;
        --panel-max-width: 24rem;
        --panel-padding-y: 1.85rem;
        --panel-padding-x: 1.65rem;
        --title-size: 2.35rem;
        --title-size-danger: 1.75rem;
        --logo-max-width: 16rem;
        --tagline-size: 0.86rem;
        --footer-size: 0.68rem;
        --hud-padding-y: 0.9rem;
        --hud-padding-x: 1.05rem;
        --hud-btn-size: 2.55rem;
        --hud-btn-icon-size: 1.1rem;
        --hud-score-min-width: 4.5rem;
        --hud-score-value-size: 1.4rem;
        --stat-value-size: 2.2rem;
        --btn-font-size: 0.8rem;
        --btn-padding-y: 0.88rem;
        --tips-gap: 0.55rem;
        --tip-card-padding-y: 0.65rem;
        --device-icon-size: 3rem;
    }
}

/* Mobile (481px – 640px) */
@media (min-width: 481px) and (max-width: 640px) {
    :root {
        --space-modal: 1rem;
        --panel-max-width: 21rem;
        --panel-padding-y: 1.65rem;
        --panel-padding-x: 1.4rem;
        --title-size: 2rem;
        --title-size-danger: 1.65rem;
        --logo-max-width: 14rem;
        --tagline-size: 0.84rem;
        --footer-size: 0.66rem;
        --hud-padding-y: 0.75rem;
        --hud-padding-x: 0.9rem;
        --hud-btn-size: 2.45rem;
        --hud-btn-icon-size: 1.05rem;
        --hud-score-min-width: 4.25rem;
        --hud-score-padding-y: 0.4rem;
        --hud-score-padding-x: 0.75rem;
        --hud-score-label-size: 0.58rem;
        --hud-score-value-size: 1.25rem;
        --stat-value-size: 2rem;
        --btn-font-size: 0.78rem;
        --btn-padding-y: 0.82rem;
        --btn-padding-x: 1.25rem;
        --tips-gap: 0.5rem;
        --tip-card-padding-y: 0.6rem;
        --tip-key-size: 0.65rem;
        --tip-text-size: 0.75rem;
        --badge-size: 0.6rem;
        --device-icon-size: 2.75rem;
    }
}

/* Small Mobile (≤480px) */
@media (max-width: 480px) {
    :root {
        --space-modal: 0.85rem;
        --panel-max-width: 100%;
        --panel-padding-y: 1.45rem;
        --panel-padding-x: 1.15rem;
        --title-size: 1.75rem;
        --title-size-danger: 1.5rem;
        --logo-max-width: 12.5rem;
        --tagline-size: 0.8rem;
        --footer-size: 0.62rem;
        --hud-padding-y: 0.65rem;
        --hud-padding-x: 0.75rem;
        --hud-btn-size: 2.35rem;
        --hud-btn-icon-size: 1rem;
        --hud-score-min-width: 4rem;
        --hud-score-padding-y: 0.35rem;
        --hud-score-padding-x: 0.65rem;
        --hud-score-label-size: 0.55rem;
        --hud-score-value-size: 1.15rem;
        --stat-value-size: 1.85rem;
        --btn-font-size: 0.74rem;
        --btn-padding-y: 0.78rem;
        --btn-padding-x: 1.1rem;
        --tips-gap: 0.45rem;
        --tip-card-padding-y: 0.55rem;
        --tip-card-padding-x: 0.45rem;
        --tip-key-size: 0.62rem;
        --tip-text-size: 0.72rem;
        --badge-size: 0.58rem;
        --device-icon-size: 2.5rem;
    }

    .modal__panel {
        border-radius: var(--radius-md);
    }
}

/* Landscape Mobile (phones held sideways) */
@media (orientation: landscape) and (max-height: 500px) {
    :root {
        --space-modal: 0.75rem;
        --panel-max-width: 28rem;
        --panel-padding-y: 1.1rem;
        --panel-padding-x: 1.35rem;
        --title-size: 1.55rem;
        --title-size-danger: 1.4rem;
        --logo-max-width: 10.5rem;
        --logo-margin-bottom: 0.35rem;
        --tagline-size: 0.76rem;
        --footer-size: 0.6rem;
        --hud-padding-y: 0.55rem;
        --hud-padding-x: 0.85rem;
        --hud-btn-size: 2.2rem;
        --hud-score-value-size: 1.1rem;
        --stat-value-size: 1.75rem;
        --btn-font-size: 0.72rem;
        --btn-padding-y: 0.7rem;
        --tips-gap: 0.4rem;
        --tip-card-padding-y: 0.45rem;
        --badge-size: 0.55rem;
        --device-icon-size: 2.25rem;
    }

    .modal {
        align-items: center;
        padding: var(--space-modal) 1.25rem;
    }

    .modal__panel {
        max-height: calc(100vh - 1.5rem);
        overflow-y: auto;
    }

    .modal__badge {
        margin-bottom: 0.5rem;
    }

    .modal__tagline {
        margin-bottom: 1rem;
    }

    .modal__instructions {
        margin-bottom: 1rem;
    }

    .modal__footer {
        margin-top: 0.85rem;
    }

    .modal__device-icon {
        margin-bottom: 0.65rem;
    }

    .modal__tagline--mobile-block {
        max-width: 36ch;
    }
}

/* Desktop enhancements (≥1025px) */
@media (min-width: 1025px) {
    :root {
        --space-modal: 1.5rem;
        --panel-max-width: 26rem;
        --panel-padding-y: 2.25rem;
        --panel-padding-x: 2rem;
        --title-size: 2.85rem;
        --title-size-danger: 2rem;
        --logo-max-width: 18rem;
        --tagline-size: 0.92rem;
        --hud-padding-y: 1.1rem;
        --hud-padding-x: 1.35rem;
        --hud-score-value-size: 1.55rem;
        --stat-value-size: 2.5rem;
        --device-icon-size: 3.75rem;
    }
}