/* Survivor — open-source roguelite styles */
:root {
    --bg: #0a0a12;
    --card: rgba(6, 8, 16, 0.92);
    --accent: #ffd24d;
    --accent-strong: #ffb400;
    /* iter-10 a11y: --primary darkened from #3388ff (3.43:1 vs white) to
       #1d6fe0 (~4.66:1) so primary buttons clear the WCAG AA 4.5:1 bar
       at the existing 15px weight 600 on white text. */
    --primary: #1d6fe0;
    --primary-strong: #4d92ff;
    --danger: #ff3355;
    --muted: #8a8fa0;
    --text: #e8ebf3;
    --border: #2a2f44;
}

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

html,
body {
    /* Use small-viewport / dynamic-viewport units with a vh fallback so iOS
       Safari doesn't overflow behind the address bar. */
    height: 100vh;
    height: 100svh;
    height: 100dvh;
    background: radial-gradient(ellipse at top, #1b1330 0%, #0a0a12 70%);
    color: var(--text);
    font-family:
        system-ui,
        -apple-system,
        'Segoe UI',
        'Microsoft YaHei',
        sans-serif;
    overflow: hidden;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: none; /* disable browser pinch/zoom inside the game */
    overscroll-behavior: none; /* no pull-to-refresh on mobile */
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
}

#gameContainer {
    position: relative;
    box-shadow: 0 0 60px rgba(120, 60, 220, 0.35);
    border-radius: 6px;
    overflow: hidden;
    max-width: 100vw;
    max-height: 100vh;
    max-height: 100svh;
    max-height: 100dvh;
}

/*
 * Accessibility: a visually-hidden element that still exposes text to
 * assistive tech. Paired with aria-live="polite" to announce game events.
 */
.sr-only {
    position: absolute !important;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Visible focus ring for keyboard users. Pointer users keep a clean look. */
:focus:not(:focus-visible) {
    outline: none;
}
:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 3px;
    border-radius: 4px;
}
.btn:focus-visible,
.icon-btn:focus-visible,
.upgrade-option:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 3px;
    box-shadow: 0 0 0 6px rgba(255, 210, 77, 0.25);
}

canvas {
    display: block;
    border: 1px solid #222;
    background: #1a1a2e;
    width: 100%;
    height: 100%;
    image-rendering: crisp-edges;
}

#ui {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hud {
    position: absolute;
    padding: 10px 14px;
    color: var(--text);
    font-size: 14px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.8);
    line-height: 1.6;
}

.hud-sub {
    color: var(--muted);
    font-size: 12px;
}

#topLeft {
    top: 10px;
    left: 10px;
}
#topRight {
    top: 10px;
    right: 10px;
    text-align: right;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
}
#bottomLeft {
    bottom: 10px;
    left: 10px;
}

.bar-label {
    margin-top: 6px;
    font-size: 12px;
    color: var(--muted);
}

.hp-bar,
.exp-bar {
    width: 220px;
    height: 12px;
    background: rgba(20, 22, 36, 0.9);
    border: 1px solid var(--border);
    border-radius: 999px;
    overflow: hidden;
}
.hp-fill {
    height: 100%;
    background: linear-gradient(90deg, #ff3355, #ff6a7a);
    transition: width 0.2s;
}
.exp-fill {
    height: 100%;
    background: linear-gradient(90deg, #3388ff, #66bbff);
    transition: width 0.2s;
}

.chip-row {
    display: flex;
    gap: 6px;
    margin-top: 8px;
    flex-wrap: wrap;
}

.weapon-icons {
    position: absolute;
    bottom: 10px;
    right: 10px;
    max-width: 260px;
    justify-content: flex-end;
    /* iter-10: float HUD chips above the gameplay so the player avatar can
       never tuck under them when the camera stops at the arena edge. The
       semi-transparent backdrop on `.chip` keeps things legible without
       hiding the world behind it. */
    z-index: 5;
    pointer-events: none;
}
.weapon-icons .chip {
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(2px);
}

.chip {
    position: relative;
    width: 38px;
    height: 38px;
    background: rgba(0, 0, 0, 0.72);
    border: 2px solid var(--border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}
.chip.active {
    border-color: var(--accent);
    box-shadow: 0 0 10px rgba(255, 210, 77, 0.35);
}
.chip.maxed {
    border-color: #00d9a0;
    box-shadow: 0 0 10px rgba(0, 217, 160, 0.4);
}
.chip.evolved {
    border-color: #ff66aa;
    box-shadow: 0 0 12px rgba(255, 102, 170, 0.55);
}
.chip-lvl {
    position: absolute;
    bottom: -4px;
    right: -4px;
    background: var(--accent);
    color: #111;
    font-size: 10px;
    font-weight: 700;
    padding: 1px 4px;
    border-radius: 6px;
}

.icon-btn {
    pointer-events: auto;
    background: rgba(10, 12, 22, 0.85);
    border: 1px solid var(--border);
    color: var(--text);
    width: 36px;
    height: 36px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
}
.icon-btn:hover {
    background: #1a1c30;
}

/* Overlays ------------------------------------------------------------- */
.overlay {
    position: absolute;
    inset: 0;
    background: rgba(5, 6, 14, 0.6);
    backdrop-filter: blur(6px);
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: auto;
    z-index: 10;
}

.overlay-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 28px 32px;
    text-align: center;
    min-width: 360px;
    max-width: 92vw;
    max-height: 92vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
}

.overlay-card h1 {
    color: var(--primary-strong);
    font-size: 36px;
    letter-spacing: 2px;
    margin-bottom: 6px;
    text-shadow: 0 0 20px rgba(85, 160, 255, 0.5);
}
.overlay-card h2 {
    color: var(--accent);
    margin-bottom: 18px;
    font-size: 22px;
    letter-spacing: 1px;
}
.overlay-card .subtitle {
    color: var(--muted);
    margin-bottom: 22px;
}

.instructions {
    text-align: left;
    margin: 18px 0;
    padding: 16px 18px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 13px;
    line-height: 1.9;
}

.btn-row {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}
.btn-row.vertical {
    flex-direction: column;
    align-items: stretch;
}

.btn {
    border: 0;
    padding: 12px 26px;
    font-size: 15px;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    transition:
        transform 0.15s ease,
        background 0.2s;
    color: #fff;
}
.btn:hover {
    transform: translateY(-1px);
}
.btn.primary {
    background: var(--primary);
}
.btn.primary:hover {
    background: var(--primary-strong);
}
.btn.ghost {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
}
.btn.ghost:hover {
    background: rgba(255, 255, 255, 0.05);
}
.btn.danger {
    background: var(--danger);
}

/* Level-up ----------------------------------------------------------- */
.overlay-card.levelup {
    min-width: 440px;
}
.upgrade-option {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px 16px;
    margin: 10px 0;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
    outline: none;
}
.upgrade-option:hover,
.upgrade-option:focus {
    background: rgba(255, 210, 77, 0.12);
    border-color: var(--accent);
    transform: translateX(2px);
}
.upgrade-option .name {
    color: var(--accent);
    font-weight: 700;
    font-size: 16px;
}
.upgrade-option .desc {
    color: var(--muted);
    font-size: 12px;
    margin-top: 4px;
}
.upgrade-option.maxed {
    opacity: 0.55;
    cursor: default;
    border-style: dashed;
}
.upgrade-option.maxed:hover,
.upgrade-option.maxed:focus {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--border);
    transform: none;
}
.upgrade-option.maxed .name::after {
    content: '';
}

/* Achievements gallery ---------------------------------------------- */
.achievements-card {
    min-width: 540px;
    max-width: 92vw;
    max-height: 88vh;
    overflow-y: auto;
}
.achievements-card .ach-count {
    color: var(--muted);
    font-size: 14px;
    font-weight: 400;
    margin-left: 8px;
}
.ach-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 10px;
    margin: 14px 0 18px;
}
.ach-card {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 10px;
    text-align: center;
    transition: transform 0.15s;
}
.ach-card.earned {
    border-color: var(--accent);
    background: rgba(255, 210, 77, 0.07);
}
.ach-card.locked {
    opacity: 0.55;
    filter: grayscale(0.6);
}
.ach-card-icon {
    font-size: 28px;
    line-height: 1;
}
.ach-card-name {
    margin-top: 6px;
    font-weight: 700;
    color: var(--accent);
    font-size: 13px;
}
.ach-card.locked .ach-card-name {
    color: var(--muted);
}
.ach-card-desc {
    margin-top: 4px;
    font-size: 11px;
    color: var(--muted);
    line-height: 1.4;
}

/* Game over ---------------------------------------------------------- */
.overlay-card.gameover {
    border-color: var(--danger);
}
.overlay-card.gameover h1 {
    color: var(--danger);
    text-shadow: 0 0 20px rgba(255, 51, 85, 0.5);
}
.stats {
    margin: 18px 0;
    font-size: 16px;
    line-height: 2;
}

/* Settings ----------------------------------------------------------- */
.settings-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 26px 28px;
    min-width: 360px;
    max-width: 92vw;
    max-height: 88vh;
    overflow-y: auto;
}
.settings-card h2 {
    color: var(--accent);
    margin-bottom: 16px;
}
.settings-row {
    display: grid;
    grid-template-columns: 1fr 2fr auto;
    gap: 10px;
    align-items: center;
    padding: 10px 0;
    border-top: 1px dashed var(--border);
    font-size: 14px;
}
.settings-row:first-of-type {
    border-top: 0;
}
.settings-row input[type='range'] {
    width: 100%;
}
.settings-row output {
    color: var(--muted);
    font-size: 12px;
    min-width: 36px;
    text-align: right;
}
.settings-row select {
    background: #101224;
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 6px 8px;
}
.settings-buttons {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    margin-top: 18px;
}

/* Boss banner -------------------------------------------------------- */
.boss-banner {
    position: absolute;
    top: 35%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    color: var(--danger);
    font-size: 42px;
    font-weight: 900;
    letter-spacing: 4px;
    text-shadow: 0 0 30px rgba(255, 50, 80, 0.7);
    opacity: 0;
    transition:
        opacity 0.4s,
        transform 0.4s;
    pointer-events: none;
}
.boss-banner.visible {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

/* Virtual joystick (touch only) -------------------------------------- */
/* iter-14: edge-button size is now driven by --touch-button-size, set on
   <html> by storage.js settings.touchButtonScale (0.8 / 1.0 / 1.2). The
   joystick base + knob and the special-skill button all scale together so
   thumb reach stays consistent. */
:root {
    --touch-button-size: 140px;
    --touch-knob-size: 58px;
    --touch-special-size: 96px;
}
.joystick {
    position: absolute;
    bottom: 80px;
    left: 30px;
    width: var(--touch-button-size);
    height: var(--touch-button-size);
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(255, 255, 255, 0.08);
    display: none;
    pointer-events: auto;
    touch-action: none;
}
.joystick-knob {
    position: absolute;
    top: 50%;
    left: 50%;
    width: var(--touch-knob-size);
    height: var(--touch-knob-size);
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.25);
    transform: translate(-50%, -50%);
}

/* Special-skill button — mirrors the joystick on the bottom-right. */
.special-skill-btn {
    position: absolute;
    bottom: 100px;
    right: 30px;
    width: var(--touch-special-size);
    height: var(--touch-special-size);
    border-radius: 50%;
    background: rgba(120, 80, 200, 0.25);
    color: #fff;
    border: 2px solid rgba(180, 140, 255, 0.55);
    font-size: 36px;
    line-height: 1;
    display: none;
    pointer-events: auto;
    touch-action: none;
    cursor: pointer;
}
.special-skill-btn:active {
    background: rgba(160, 110, 240, 0.4);
}

@media (hover: none) and (pointer: coarse) {
    .joystick,
    .special-skill-btn {
        display: block;
    }
}

/* iter-14: PWA install prompt slot. */
.pwa-install-prompt {
    position: fixed;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #fff;
    padding: 10px 14px;
    border-radius: 12px;
    display: flex;
    gap: 10px;
    align-items: center;
    z-index: 9999;
    font-size: 14px;
}

/* Accessibility ------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
    .btn,
    .upgrade-option,
    .boss-banner,
    .ach-toast,
    .hp-fill,
    .exp-fill {
        transition: none !important;
        animation: none !important;
    }
    .btn:hover {
        transform: none;
    }
    .upgrade-option:hover,
    .upgrade-option:focus {
        transform: none;
    }
}

/*
 * High-contrast mode. We opt into this both via the user's OS preference
 * (prefers-contrast: more) and the forced-colors mode that Windows uses.
 * Colours are widened, outlines thicken, and low-opacity surfaces are
 * replaced with solid fills so text stays legible.
 */
@media (prefers-contrast: more) {
    :root {
        --accent: #ffff44;
        --primary: #66ddff;
        --danger: #ff6699;
        --muted: #c8cbd8;
        --border: #888ea5;
    }
    .overlay {
        background: rgba(0, 0, 0, 0.9);
    }
    .overlay-card,
    .settings-card {
        border-width: 2px;
    }
    .chip {
        border-width: 3px;
    }
    .btn {
        outline: 1px solid rgba(255, 255, 255, 0.3);
    }
}

@media (forced-colors: active) {
    .btn,
    .icon-btn,
    .upgrade-option {
        border: 1px solid ButtonBorder;
        forced-color-adjust: none;
    }
    :focus-visible {
        outline: 3px solid Highlight;
    }
}

/* Achievement toasts ------------------------------------------------- */
.ach-toast-host {
    position: absolute;
    top: 14px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
    z-index: 20;
    width: min(380px, 92vw);
}
.ach-toast {
    background: rgba(8, 12, 24, 0.92);
    border: 1px solid var(--accent);
    border-radius: 10px;
    padding: 10px 12px;
    color: var(--text);
    display: flex;
    gap: 10px;
    align-items: center;
    opacity: 0;
    transform: translateY(-8px);
    transition:
        opacity 0.35s ease,
        transform 0.35s ease;
    box-shadow: 0 6px 22px rgba(0, 0, 0, 0.5);
}
.ach-toast.visible {
    opacity: 1;
    transform: translateY(0);
}
.ach-toast .ach-icon {
    font-size: 22px;
    width: 34px;
    text-align: center;
}
.ach-toast .ach-title {
    font-size: 11px;
    letter-spacing: 1px;
    color: var(--accent);
    text-transform: uppercase;
}
.ach-toast .ach-name {
    font-weight: 700;
    font-size: 14px;
}
.ach-toast .ach-desc {
    color: var(--muted);
    font-size: 12px;
}

/* High score list --------------------------------------------------- */
.hs-details {
    text-align: left;
    margin: 12px 0 6px;
    color: var(--muted);
    font-size: 13px;
}
.hs-details > summary {
    cursor: pointer;
    color: var(--accent);
    font-weight: 600;
    padding: 6px 0;
}
.hs-list {
    margin-top: 8px;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    font-size: 12px;
}
.hs-head,
.hs-row {
    display: grid;
    grid-template-columns: 24px 1fr 1fr 1fr 1.4fr;
    padding: 6px 10px;
    gap: 6px;
}
.hs-head {
    background: rgba(255, 255, 255, 0.05);
    color: var(--accent);
    font-weight: 700;
    font-size: 11px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}
.hs-row:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
}
.hs-empty {
    color: var(--muted);
    padding: 10px;
    font-style: italic;
}

/* Speedrun splits + leaderboard wide view ---------------------------- */
.splits {
    margin: 6px 0 10px;
    padding: 6px 8px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.04);
    font-size: 12px;
}
.splits-head {
    color: var(--accent);
    font-weight: 700;
    margin-bottom: 4px;
}
.split-row {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: 10px;
}
.hs-head.wide,
.hs-row.wide {
    grid-template-columns: 24px 70px 60px 60px 1.4fr 100px 50px;
}
.hs-list.scroll {
    max-height: 260px;
    overflow-y: auto;
}
.leaderboard-card {
    max-width: 720px;
    width: 90vw;
}
.lb-section {
    margin-top: 10px;
}
.lb-section h3 {
    color: var(--accent);
    font-size: 13px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 4px;
}
.lb-json {
    width: 100%;
    margin-top: 10px;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 11px;
    padding: 6px 8px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    color: #ddd;
    border-radius: 6px;
    resize: vertical;
}
.no-hit {
    color: #66ddaa;
    font-weight: 700;
}

/* Evolve badge on level-up option ----------------------------------- */
.upgrade-option .evolve-tag {
    color: #ff88bb;
    font-size: 12px;
    margin-top: 4px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

/* Colorblind / high-contrast mode ----------------------------------- */
body.cb-mode {
    --accent: #ffff44;
    --primary: #55ddff;
    --danger: #ff77aa;
}
body.cb-mode .chip {
    border-width: 3px;
}
body.cb-mode .hp-fill {
    background: #ff77aa;
}
body.cb-mode .exp-fill {
    background: #55ddff;
}

/* Phones ------------------------------------------------------------- */
@media (max-width: 768px) {
    .overlay-card,
    .overlay-card.levelup,
    .settings-card {
        min-width: 260px;
        padding: 18px;
    }
    .hud {
        font-size: 12px;
        padding: 6px 8px;
    }
    .hp-bar,
    .exp-bar {
        width: 140px;
    }
    .chip {
        width: 32px;
        height: 32px;
        font-size: 15px;
    }
    .overlay-card h1 {
        font-size: 26px;
    }
    .boss-banner {
        font-size: 28px;
    }
}

/* iter-12: stage picker + daily share ------------------------------- */
.stage-picker-card {
    max-width: 720px;
}
.stage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
    margin: 16px 0;
}
.stage-card {
    background: rgba(255, 255, 255, 0.04);
    border: 2px solid rgba(255, 255, 255, 0.12);
    border-radius: 10px;
    padding: 14px;
    color: var(--fg, #eee);
    text-align: left;
    cursor: pointer;
    transition:
        border-color 0.15s,
        transform 0.1s;
}
.stage-card:hover,
.stage-card:focus-visible {
    border-color: var(--accent, #ffcc66);
    transform: translateY(-1px);
}
.stage-card.active {
    border-color: var(--accent, #ffcc66);
    background: rgba(255, 204, 102, 0.08);
}
.stage-icon {
    font-size: 32px;
    line-height: 1;
    margin-bottom: 6px;
}
.stage-name {
    font-weight: 700;
    margin-bottom: 4px;
}
.stage-desc {
    font-size: 13px;
    opacity: 0.78;
}
.daily-share-row {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    margin: 10px 0 4px;
}
.share-preview {
    background: rgba(0, 0, 0, 0.35);
    color: #ddd;
    padding: 8px 10px;
    border-radius: 6px;
    font-size: 12px;
    white-space: pre-wrap;
    margin: 0;
}

/* iter-13: stage chip on main menu Stage button --------------------- */
.stage-chip {
    display: inline-block;
    margin-left: 6px;
    padding: 2px 8px;
    font-size: 12px;
    font-weight: 600;
    background: rgba(255, 204, 102, 0.12);
    border: 1px solid rgba(255, 204, 102, 0.4);
    border-radius: 999px;
    color: var(--accent, #ffcc66);
    vertical-align: middle;
}

.hotkey-hint {
    margin-top: 14px;
    font-size: 12px;
    color: var(--muted, #aaa);
    text-align: center;
}
.hotkey-hint kbd {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-bottom-width: 2px;
    border-radius: 4px;
    padding: 1px 6px;
    margin: 0 2px;
    font-family: ui-monospace, Menlo, Consolas, monospace;
    font-size: 11px;
}

/* iter-13: daily streak overlay ------------------------------------- */
.streak-card {
    max-width: 560px;
}
.streak-stats {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 14px;
}
.streak-pill {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 14px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 110px;
}
.streak-pill span {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.7;
}
.streak-pill strong {
    font-size: 22px;
    color: var(--accent, #ffcc66);
}
.streak-label {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.7;
    margin-bottom: 6px;
}
.streak-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 6px;
    margin-bottom: 12px;
}
.streak-cell {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.45);
}
.streak-cell.played {
    background: rgba(85, 160, 255, 0.18);
    border-color: rgba(85, 160, 255, 0.4);
    color: #cfe5ff;
}
.streak-cell.won {
    background: rgba(85, 220, 130, 0.22);
    border-color: rgba(85, 220, 130, 0.5);
    color: #d0ffd9;
}
.streak-cell.missed {
    /* default; kept explicit so the contract is obvious in tests */
}

/* iter-13: help (keyboard shortcuts) overlay ------------------------ */
.help-card {
    max-width: 460px;
}
.help-rows {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 18px;
    text-align: left;
}
.help-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 6px 10px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: 6px;
}
.help-row kbd {
    font-family: ui-monospace, Menlo, Consolas, monospace;
    background: rgba(255, 255, 255, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 12px;
}

/* iter-13: how-to-play overlay -------------------------------------- */
.howto-card {
    max-width: 520px;
}
.howto-list {
    text-align: left;
    margin: 12px 0 18px;
    padding-left: 22px;
    line-height: 1.7;
    font-size: 14px;
}
.howto-list li + li {
    margin-top: 6px;
}

/* iter-15: tutorial offer + tutorial banner + replay menu --------------- */
.tutorial-offer {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(8, 6, 18, 0.78);
    backdrop-filter: blur(2px);
    z-index: 60;
}
.tutorial-offer-card {
    background: #1a1432;
    border: 1px solid #3a2f5a;
    border-radius: 14px;
    padding: 22px 26px;
    text-align: center;
    max-width: 380px;
    box-shadow: 0 14px 40px rgba(0, 0, 0, 0.45);
}
.tutorial-banner {
    position: absolute;
    top: 16px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(20, 12, 38, 0.92);
    border: 1px solid #4a3a8a;
    border-radius: 10px;
    padding: 10px 16px;
    color: #f3edff;
    font-size: 13px;
    line-height: 1.4;
    max-width: min(560px, 90vw);
    z-index: 50;
    pointer-events: none;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}
.tutorial-banner strong {
    display: block;
    color: #ffd66b;
    margin-bottom: 4px;
}
.tutorial-banner .tutorial-body {
    display: block;
}
.tutorial-banner .tutorial-skip-hint {
    display: block;
    margin-top: 6px;
    font-size: 11px;
    opacity: 0.7;
}
.replay-card {
    max-width: 480px;
}
.replay-summary {
    text-align: left;
    margin: 12px 0 18px;
    padding: 10px 14px;
    background: rgba(0, 0, 0, 0.25);
    border-radius: 8px;
    font-size: 14px;
    line-height: 1.7;
}