:root { color-scheme: dark; --canvas: #121713; --surface: #1c241f; --surface-subtle: #273029; --ink: #f0f2eb; --ink-muted: #9ba69d; --line: #313c34; --line-strong: #526057; --accent: #78a784; --accent-hover: #8ab896; --accent-soft: #26372c; --on-accent: #101712; --danger: #e37a70; --focus: #75c7ee; --radius-lg: 14px; --shadow-md: 0 18px 48px rgba(0, 0, 0, 0.28); font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; font-synthesis: none; text-rendering: optimizeLegibility; }
*, *::before, *::after { box-sizing: border-box; }
html { min-height: 100%; background: var(--canvas); scrollbar-gutter: stable; }
body { min-height: 100vh; min-height: 100svh; margin: 0; color: var(--ink); background: var(--canvas); line-height: 1.5; }
button, input { font: inherit; }
button, a, input { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
a { color: inherit; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { text-wrap: balance; }
::selection { color: var(--on-accent); background: var(--accent); }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
h1[tabindex="-1"]:focus-visible { outline: 0; }
.visually-hidden { width: 1px; height: 1px; overflow: hidden; position: absolute; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; }
.shell { width: min(calc(100% - 1rem), 72rem); margin-inline: auto; }
.site-header { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.site-header > p { display: none; margin: 0; color: var(--ink-muted); font-size: 0.72rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; }
.wordmark { min-height: 44px; display: inline-flex; align-items: center; gap: 0.7rem; color: var(--ink); font-size: 1.25rem; font-weight: 800; letter-spacing: -0.045em; line-height: 1; text-decoration: none; }
.brand-mark { width: 42px; height: 42px; display: block; flex: 0 0 auto; }
.brand-name { translate: 0 -0.02em; }
.site-footer { color: var(--ink-muted); background: var(--canvas); }
.site-footer-inner { display: grid; gap: 2rem; padding-block: 2.75rem max(2.75rem, env(safe-area-inset-bottom)); border: 0; }
.site-footer p { margin: 0; }
.footer-intro { min-width: 0; display: grid; gap: 0.6rem; }
.footer-brand { min-height: 52px; display: inline-flex; align-items: center; justify-self: start; gap: 0.8rem; color: var(--ink); font-size: 1.3rem; font-weight: 820; letter-spacing: -0.04em; line-height: 1; text-decoration: none; }
.footer-mark { width: 48px; height: 48px; display: block; flex: 0 0 auto; }
.footer-summary { max-width: 37rem; font-size: 0.78rem; line-height: 1.65; }
.footer-heart { color: var(--accent); font-size: 1.08rem; line-height: 1; }
.footer-actions { min-width: 0; display: grid; justify-items: start; gap: 0.65rem; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 0.25rem 0.45rem; }
.footer-nav a { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; padding-inline: 0.45rem; border-radius: 9px; font-size: 0.72rem; font-weight: 740; text-align: center; text-decoration: none; transition: color 140ms ease, background 140ms ease; }
.footer-copyright { font-size: 0.66rem; font-variant-numeric: tabular-nums; line-height: 1.4; }
.eyebrow, .step, .system-label { margin-bottom: 0.65rem; color: var(--accent); font-size: 0.7rem; font-weight: 820; letter-spacing: 0.12em; text-transform: uppercase; }
.hero { min-height: calc(100svh - 137px); display: grid; gap: 2rem; align-items: center; padding-block: 2rem 3rem; }
.hero-copy { min-width: 0; }
.hero h1 { max-width: 10ch; margin-bottom: 1rem; font-size: clamp(2.8rem, 13vw, 5.25rem); font-weight: 760; letter-spacing: -0.07em; line-height: 0.94; }
.lede { max-width: 34rem; margin-bottom: 0; color: var(--ink-muted); font-size: clamp(0.96rem, 4vw, 1.1rem); line-height: 1.6; }
.trust-row { display: flex; flex-wrap: wrap; gap: 0.55rem 1rem; margin-top: 1.25rem; color: var(--ink-muted); font-size: 0.72rem; font-weight: 680; }
.trust-row span { display: inline-flex; align-items: center; gap: 0.4rem; }
.trust-row b { width: 18px; height: 18px; display: grid; place-items: center; color: var(--accent); border-radius: 50%; background: var(--accent-soft); font-size: 0.65rem; }
.product-story { padding-block: 3.5rem 4.5rem; border: 0; }
.story-intro { display: grid; gap: 1rem; margin-bottom: 1.5rem; }
.story-intro h2, .section-heading h2 { max-width: 16ch; margin: 0; font-size: clamp(1.9rem, 8vw, 3.15rem); font-weight: 760; letter-spacing: -0.055em; line-height: 1.02; }
.story-intro > p { max-width: 41rem; margin: 0; color: var(--ink-muted); font-size: 0.95rem; line-height: 1.7; }
.play-options { display: grid; gap: 0.75rem; }
.play-option { min-width: 0; padding: 1.25rem; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); }
.option-number { margin-bottom: 1.6rem; color: var(--accent); font-size: 0.68rem; font-weight: 820; letter-spacing: 0.1em; }
.play-option h3 { margin-bottom: 0.65rem; font-size: 1.18rem; font-weight: 760; letter-spacing: -0.025em; line-height: 1.15; }
.play-option > p:not(.option-number) { margin-bottom: 1rem; color: var(--ink-muted); font-size: 0.84rem; line-height: 1.65; }
.play-option a { min-height: 44px; display: inline-flex; align-items: center; gap: 0.55rem; color: var(--ink); font-size: 0.78rem; font-weight: 760; text-underline-offset: 0.2em; }
.play-option a span { color: var(--accent); }
.free-offer { min-height: 44px; display: inline-flex; align-items: center; gap: 0.45rem; color: var(--ink); font-size: 0.78rem; font-weight: 760; }
.free-offer span { color: var(--accent); }
.homepage-replays { margin-top: clamp(4.5rem, 10vw, 7rem); }
.homepage-replay-heading { display: grid; gap: 1rem; margin-bottom: clamp(1.75rem, 4vw, 2.5rem); }
.homepage-replay-heading h2 { max-width: 15ch; margin: 0; font-size: clamp(1.9rem, 8vw, 3.15rem); font-weight: 760; letter-spacing: -0.055em; line-height: 1.02; }
.homepage-replay-heading div > p:last-child { max-width: 38rem; margin: 0.8rem 0 0; color: var(--ink-muted); font-size: 0.9rem; line-height: 1.7; }
.homepage-replay-index-link { min-height: 44px; display: inline-flex; align-items: center; justify-self: start; gap: 0.55rem; border-radius: 9px; font-size: 0.78rem; font-weight: 760; text-underline-offset: 0.2em; }
.homepage-replay-index-link span { color: var(--accent); }
.homepage-replay-layout, .homepage-replay-list { display: grid; gap: 0.75rem; }
.homepage-replay-card { min-width: 0; display: grid; gap: 1rem; padding: 1.25rem; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); }
.homepage-replay-card.featured { min-height: 21rem; grid-template-rows: auto 1fr auto; background: linear-gradient(145deg, var(--accent-soft), var(--surface) 66%); }
.homepage-replay-card.compact { min-height: 10.5rem; grid-template-rows: auto 1fr auto; }
.homepage-replay-card-top { min-width: 0; display: flex; align-items: center; justify-content: space-between; gap: 1rem; color: var(--accent); font-size: 0.66rem; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; }
.homepage-replay-card-top strong { flex: 0 0 auto; color: var(--ink); font-size: 1rem; font-variant-numeric: tabular-nums; letter-spacing: -0.02em; }
.homepage-replay-card-copy { min-width: 0; align-self: center; }
.homepage-replay-card-copy > p:first-child { margin-bottom: 0.55rem; color: var(--accent); font-size: 0.66rem; font-weight: 760; letter-spacing: 0.055em; text-transform: uppercase; }
.homepage-replay-card h3 { margin: 0; overflow-wrap: anywhere; font-size: 1.08rem; letter-spacing: -0.03em; line-height: 1.18; }
.homepage-replay-card.featured h3 { max-width: 18ch; font-size: clamp(1.55rem, 7vw, 2.35rem); letter-spacing: -0.05em; line-height: 1.03; }
.homepage-replay-card h3 a { min-height: 44px; display: inline-flex; align-items: center; border-radius: 7px; text-decoration: none; }
.homepage-replay-card-copy > p:last-child, .homepage-replay-card.compact > p { margin: 0; color: var(--ink-muted); font-size: 0.78rem; line-height: 1.6; }
.homepage-replay-card-copy > p:last-child { max-width: 52ch; margin-top: 0.7rem; }
.homepage-replay-facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.7rem; margin: 0; padding-top: 1rem; border-top: 1px solid var(--line); }
.homepage-replay-facts div { min-width: 0; }
.homepage-replay-facts dt { margin-bottom: 0.12rem; color: var(--ink-muted); font-size: 0.58rem; font-weight: 750; letter-spacing: 0.06em; text-transform: uppercase; }
.homepage-replay-facts dd { margin: 0; overflow-wrap: anywhere; color: var(--ink); font-size: 0.7rem; font-weight: 680; }
.how-it-works, .online-chess-faq { margin-top: clamp(4.5rem, 10vw, 7rem); padding-top: 0; border: 0; }
.section-heading { margin-bottom: clamp(1.75rem, 4vw, 2.5rem); }
.how-it-works ol { display: grid; gap: 1.75rem; margin: 0; padding: 0; list-style: none; }
.how-it-works li { display: grid; grid-template-columns: 2.25rem minmax(0, 1fr); gap: 0.9rem; padding: 0; border: 0; }
.how-it-works li > span { color: var(--accent); background: transparent; font-size: 0.78rem; font-weight: 820; font-variant-numeric: tabular-nums; letter-spacing: 0.08em; line-height: 1.5; }
.how-it-works strong { display: block; margin-bottom: 0.3rem; font-size: 0.98rem; }
.how-it-works li p { max-width: 32rem; margin: 0; color: var(--ink-muted); font-size: 0.86rem; line-height: 1.65; }
.online-chess-faq dl { display: grid; gap: 2.5rem; margin: 0; }
.online-chess-faq dl > div { padding: 0; border: 0; }
.online-chess-faq dt { margin-bottom: 0.45rem; color: var(--ink); font-size: 0.98rem; font-weight: 760; }
.online-chess-faq dd { max-width: 52ch; margin: 0; color: var(--ink-muted); font-size: 0.86rem; line-height: 1.7; }
.create-card-wrap { width: min(100%, 30.5rem); min-width: 0; margin-inline: auto; container-type: inline-size; }
.create-card-wrap:focus-visible { outline: 0; }
.create-card { padding: clamp(1.1rem, 4vw, 1.55rem); border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); box-shadow: var(--shadow-md); }
.card-heading { margin-bottom: 1rem; }
.card-heading h2 { margin: 0 0 0.2rem; font-size: clamp(1.55rem, 7vw, 1.9rem); font-weight: 760; letter-spacing: -0.045em; line-height: 1.08; }
.card-heading p { margin: 0; color: var(--ink-muted); font-size: 0.8rem; }
.field { min-width: 0; margin: 0 0 0.85rem; padding: 0; border: 0; }
.field.compact { margin-bottom: 0.85rem; }
.field label, .field legend { display: block; margin-bottom: 0.45rem; color: var(--ink); font-size: 0.72rem; font-weight: 780; letter-spacing: 0.05em; text-transform: uppercase; }
.field label span { color: var(--ink-muted); font-size: 0.64rem; font-weight: 600; }
.field input { width: 100%; min-height: 44px; padding: 0.62rem 0.75rem; color: var(--ink); border: 1px solid transparent; border-radius: 9px; outline: 0; background: var(--surface-subtle); transition: background 140ms ease, border-color 140ms ease, box-shadow 140ms ease; }
.field input::placeholder { color: var(--ink-muted); }
.field input:focus { background: var(--surface); box-shadow: 0 0 0 2px var(--accent); }
.field .choice-input { width: 1px; height: 1px; min-height: 0; overflow: hidden; padding: 0; position: absolute; clip-path: inset(50%); border: 0; white-space: nowrap; }
.choice-input:focus-visible + label { outline: 2px solid var(--focus); outline-offset: 2px; }
.choice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.45rem; }
.choice-grid .choice-input + label { min-height: 52px; display: grid; align-content: center; gap: 0.08rem; margin: 0; padding: 0.5rem 0.6rem; color: var(--ink-muted); border: 1px solid transparent; border-radius: 9px; background: var(--surface-subtle); text-align: left; cursor: pointer; }
.choice-grid .choice-input + label strong { color: var(--ink); font-size: 0.76rem; }
.choice-grid .choice-input + label span { font-size: 0.62rem; }
.choice-grid .choice-input:checked + label, .preset-grid .choice-input:checked + .preset, .color-choice .choice-input:checked + label { color: var(--on-accent); background: var(--accent); }
.choice-grid .choice-input:checked + label strong, .choice-grid .choice-input:checked + label span, .preset-grid .choice-input:checked + .preset strong, .preset-grid .choice-input:checked + .preset span, .color-choice .choice-input:checked + label span { color: var(--on-accent); }
.preset-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.45rem; }
.preset-grid > .preset:first-of-type, .preset-grid > .preset:last-of-type { grid-column: span 2; }
.preset, .color-choice .choice-input + label { min-height: 46px; margin: 0; padding: 0.45rem; color: var(--ink-muted); border: 1px solid transparent; border-radius: 9px; background: var(--surface-subtle); cursor: pointer; transition: background 140ms ease, color 140ms ease; }
.preset strong, .preset span { display: block; }
.preset strong { color: var(--ink); font-size: 0.78rem; font-weight: 780; }
.preset span { margin-top: 0.12rem; font-size: 0.62rem; }
.time-fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.65rem; }
.unit-input { position: relative; }
.unit-input input { padding-right: 2.9rem; }
.unit-input span { position: absolute; top: 50%; right: 0.8rem; translate: 0 -50%; color: var(--ink-muted); font-size: 0.7rem; }
.color-choice { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.45rem; }
.color-choice .choice-input + label { min-height: 52px; display: grid; place-items: center; align-content: center; gap: 0.08rem; padding-inline: 0.2rem; font-size: 0.78rem; font-weight: 650; line-height: 1.05; }
.color-choice .choice-input + label span { font-size: 0.84rem; }
.create-button, .system-action { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; gap: 1rem; padding: 0.7rem 1rem; color: var(--on-accent); border: 0; border-radius: 10px; background: var(--accent); font-weight: 800; text-decoration: none; cursor: pointer; transition: background 140ms ease, translate 140ms ease; }
.create-button { width: 100%; justify-content: space-between; }
.privacy-note { margin: 0.6rem 0 0; color: var(--ink-muted); font-size: 0.66rem; text-align: center; }
.privacy-note span { color: var(--accent); }
.submit-error { margin: 0 0 0.85rem; color: var(--danger); font-size: 0.78rem; line-height: 1.45; }
.system-page { min-height: calc(100vh - 188px); min-height: calc(100svh - 188px); display: grid; place-items: center; align-content: center; padding-block: 2.5rem; text-align: center; }
.system-card { width: min(100%, 36rem); padding: clamp(1.5rem, 7vw, 3rem); position: relative; overflow: hidden; border: 0; border-radius: var(--radius-lg); background: var(--surface); box-shadow: var(--shadow-md); }
.system-piece { position: absolute; top: -1.5rem; right: 0.5rem; color: var(--accent-soft); font-size: clamp(7rem, 28vw, 11rem); line-height: 1; pointer-events: none; }
.system-card h1 { max-width: 13ch; margin-bottom: 0.75rem; position: relative; font-size: clamp(2.25rem, 11vw, 3.8rem); font-weight: 760; letter-spacing: -0.06em; line-height: 1; }
.system-card > p:not(.system-label, .system-reference) { max-width: 46ch; margin-bottom: 1.35rem; position: relative; color: var(--ink-muted); }
.system-reference { display: grid; gap: 0.25rem; margin-bottom: 1.35rem; color: var(--ink-muted); font-size: 0.76rem; }
.system-reference span { font-weight: 750; }
.system-reference code { overflow-wrap: anywhere; color: var(--ink); }
.breadcrumbs { min-height: 44px; display: flex; align-items: center; flex-wrap: wrap; gap: 0.4rem; color: var(--ink-muted); font-size: 0.72rem; }
.breadcrumbs a { min-height: 44px; display: inline-flex; align-items: center; border-radius: 8px; text-underline-offset: 0.2em; }
.breadcrumbs > span[aria-hidden="true"] { color: var(--line-strong); }
.replay-index { min-height: calc(100svh - 188px); padding-block: 1rem 4rem; }
.replay-index-heading { max-width: 42rem; padding-block: clamp(2rem, 10vw, 5rem); }
.replay-index-heading h1 { margin-bottom: 0.8rem; font-size: clamp(2.4rem, 11vw, 4.8rem); font-weight: 760; letter-spacing: -0.065em; line-height: 0.98; }
.replay-index-heading > p:last-child, .replay-detail-heading > div > p:last-child { max-width: 42rem; margin: 0; color: var(--ink-muted); font-size: clamp(0.92rem, 3vw, 1.05rem); line-height: 1.65; }
.replay-card-grid { display: grid; gap: 0.8rem; }
.replay-card { min-width: 0; display: grid; gap: 1.25rem; padding: 1.25rem; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); }
.replay-card-result { min-height: 44px; display: flex; align-items: center; justify-content: space-between; color: var(--accent); font-size: 1.4rem; font-weight: 780; }
.replay-card-result > span:last-child { font-size: 1rem; }
.replay-card-meta { margin-bottom: 0.45rem; color: var(--accent); font-size: 0.66rem; font-weight: 760; letter-spacing: 0.06em; text-transform: uppercase; }
.replay-card h2 { margin-bottom: 0.55rem; font-size: 1.2rem; letter-spacing: -0.025em; line-height: 1.2; }
.replay-card h2 a { min-height: 44px; display: inline-flex; align-items: center; text-decoration: none; }
.replay-card div > p:last-child { margin: 0; color: var(--ink-muted); font-size: 0.82rem; line-height: 1.6; }
.replay-facts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.8rem; margin: 0; }
.replay-facts div { min-width: 0; }
.replay-facts dt { margin-bottom: 0.15rem; color: var(--ink-muted); font-size: 0.62rem; font-weight: 750; letter-spacing: 0.06em; text-transform: uppercase; }
.replay-facts dd { margin: 0; overflow-wrap: anywhere; color: var(--ink); font-size: 0.76rem; font-weight: 680; }
.replay-card-facts { padding-top: 1rem; border-top: 1px solid var(--line); }
.pagination { min-height: 52px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 0.5rem; margin-top: 2rem; color: var(--ink-muted); font-size: 0.72rem; }
.pagination a { min-height: 44px; display: inline-flex; align-items: center; border-radius: 8px; color: var(--ink); font-weight: 720; }
.pagination a:last-child { justify-self: end; }
.replay-empty { max-width: 38rem; display: grid; justify-items: start; gap: 0.7rem; padding: clamp(1.5rem, 6vw, 3rem); border-radius: var(--radius-lg); background: var(--surface); }
.replay-empty > span { color: var(--accent); font-size: 1.4rem; }
.replay-empty h2 { max-width: 19ch; margin: 0; font-size: clamp(1.6rem, 7vw, 2.4rem); letter-spacing: -0.045em; line-height: 1.05; }
.replay-empty p { max-width: 44ch; margin: 0 0 0.5rem; color: var(--ink-muted); }
.replay-detail { --replay-board-width: 44rem; --replay-score-width: 21.75rem; --replay-workspace-gap: 1.25rem; --replay-workspace-width: calc(var(--replay-board-width) + var(--replay-score-width) + var(--replay-workspace-gap)); min-height: calc(100svh - 188px); padding-block: 1rem 4rem; }
.replay-detail-heading { width: min(100%, var(--replay-board-width)); display: grid; gap: 1.25rem; margin-inline: auto; padding-block: clamp(1.5rem, 7vw, 3.5rem); }
.replay-detail-heading h1 { max-width: 16ch; margin-bottom: 0.8rem; font-size: clamp(2.25rem, 8vw, 4rem); font-weight: 760; letter-spacing: -0.06em; line-height: 0.98; }
.replay-download { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; justify-self: start; padding: 0.65rem 1rem; color: var(--on-accent); border-radius: 10px; background: var(--accent); font-size: 0.78rem; font-weight: 800; text-decoration: none; }
.replay-workspace { display: grid; justify-items: center; gap: 1rem; align-items: start; }
.replay-position { width: min(100%, var(--replay-board-width)); min-width: 0; }
.replay-position-figure { width: 100%; margin: 0; }
.replay-position-figure figcaption { margin-top: 0.65rem; color: var(--ink-muted); font-size: 0.72rem; text-align: center; }
.replay-controls { min-height: 52px; display: grid; grid-template-columns: 44px 44px minmax(0, 1fr) 44px 44px; align-items: center; gap: 0.35rem; margin-top: 0.65rem; }
.replay-control-button { min-width: 44px; min-height: 44px; display: grid; place-items: center; border-radius: 9px; background: var(--surface); font-size: 0.86rem; font-weight: 800; text-decoration: none; }
.replay-control-button.disabled { color: var(--line-strong); }
.replay-progress { color: var(--ink-muted); font-size: 0.68rem; font-variant-numeric: tabular-nums; text-align: center; }
.replay-score { width: min(100%, 44rem); min-width: 0; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); }
.replay-score-heading { display: flex; align-items: start; justify-content: space-between; gap: 1rem; padding: 1.15rem; border-bottom: 1px solid var(--line); }
.replay-score-heading .eyebrow { margin-bottom: 0.35rem; }
.replay-score-heading h2 { margin: 0; font-size: 1.35rem; letter-spacing: -0.035em; }
.replay-score-heading > span { flex: 0 0 auto; padding: 0.35rem 0.55rem; color: var(--accent); border-radius: 999px; background: var(--accent-soft); font-size: 0.62rem; font-weight: 760; }
.replay-players { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.7rem; padding: 1rem 1.15rem; border-bottom: 1px solid var(--line); }
.replay-players p { min-width: 0; display: grid; gap: 0.1rem; margin: 0; }
.replay-players span { color: var(--ink-muted); font-size: 0.6rem; font-weight: 720; text-transform: uppercase; }
.replay-players strong { overflow-wrap: anywhere; font-size: 0.75rem; }
.replay-moves { max-height: 23rem; overflow: auto; margin: 0; padding: 0.65rem; list-style: none; scrollbar-gutter: stable; }
.replay-moves li { min-height: 44px; display: grid; grid-template-columns: 2.2rem repeat(2, minmax(0, 1fr)); align-items: center; gap: 0.25rem; border-radius: 8px; }
.replay-move-number { padding-left: 0.45rem; color: var(--ink-muted); font-size: 0.68rem; font-variant-numeric: tabular-nums; }
.replay-moves a { min-width: 0; min-height: 44px; display: flex; align-items: center; padding-inline: 0.55rem; border-radius: 7px; font-size: 0.78rem; font-weight: 730; text-decoration: none; }
.replay-moves a[aria-current="step"] { color: var(--on-accent); background: var(--accent); }
.replay-score > .replay-facts { padding: 1rem 1.15rem; border-top: 1px solid var(--line); }
.replay-next-actions { width: min(100%, var(--replay-board-width)); display: grid; gap: 0.65rem; margin: 1rem auto 0; }
.replay-next-actions a { min-height: 52px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-inline: 1rem; border-radius: 10px; background: var(--surface); font-size: 0.78rem; font-weight: 760; text-decoration: none; }
.replay-next-actions span { color: var(--accent); }
@supports selector(form:has(input:checked)) {
  .create-form .difficulty-field, .create-form .custom-time-fields { display: none; }
  .create-form:has(#opponent-computer:checked) .difficulty-field { display: block; }
  .create-form:has(#time-custom:checked) .custom-time-fields { display: grid; }
}
@media (hover: hover) {
  .create-button:hover, .system-action:hover { background: var(--accent-hover); translate: 0 -1px; }
  .choice-grid .choice-input:not(:checked) + label:hover, .preset-grid .choice-input:not(:checked) + .preset:hover, .color-choice .choice-input:not(:checked) + label:hover { background: var(--accent-soft); }
  .footer-nav a:hover { color: var(--ink); background: var(--accent-soft); }
  .homepage-replay-card:hover { border-color: var(--line-strong); }
  .homepage-replay-card h3 a:hover, .homepage-replay-index-link:hover { color: var(--accent); }
  .replay-card:hover { border-color: var(--line-strong); }
  .replay-card h2 a:hover, .breadcrumbs a:hover { color: var(--accent); }
  .replay-download:hover { background: var(--accent-hover); }
  .replay-controls a:hover, .replay-next-actions a:hover, .replay-moves a:hover:not([aria-current="step"]) { background: var(--accent-soft); }
}
@container (min-width: 27rem) {
  .preset-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .preset-grid > .preset:first-of-type, .preset-grid > .preset:last-of-type { grid-column: auto; }
}
@media (min-width: 35rem) {
  .shell { width: min(calc(100% - 2rem), 72rem); }
  .site-header > p { display: block; }
  .site-footer-inner { grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 2rem; padding-block: 3.25rem; }
  .footer-brand { font-size: 1.45rem; }
  .footer-mark { width: 52px; height: 52px; }
  .footer-actions { justify-items: end; }
  .footer-nav a { padding-inline: 0.8rem; }
  .replay-card { padding: 1.5rem; }
  .replay-facts { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .replay-next-actions { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 45rem) {
  .hero { padding-block: 3rem; }
  .story-intro { grid-template-columns: minmax(0, 0.9fr) minmax(18rem, 1.1fr); align-items: end; gap: 3rem; margin-bottom: 2rem; }
  .homepage-replay-layout { grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr); align-items: stretch; }
  .homepage-replay-list { grid-template-rows: repeat(3, minmax(0, 1fr)); }
  .homepage-replay-card.featured { min-height: 100%; padding: 1.5rem; }
  .homepage-replay-card.compact { min-height: 0; padding: 1rem 1.15rem; }
  .online-chess-faq dl { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2.5rem clamp(2rem, 5vw, 4rem); }
  .replay-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 58rem) {
  .site-header { min-height: 96px; }
  .wordmark { gap: 0.8rem; font-size: 1.5rem; }
  .brand-mark { width: 52px; height: 52px; }
  .hero { min-height: calc(100svh - 169px); grid-template-columns: minmax(0, 1fr) minmax(25rem, 30.5rem); align-items: start; gap: clamp(3rem, 7vw, 6rem); padding-block: 1rem 2rem; }
  .hero-copy { align-self: center; }
  .product-story { padding-block: 5rem; }
  .play-options { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .play-option { padding: 1.5rem; }
  .homepage-replay-heading { grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 2rem; }
  .homepage-replay-index-link { justify-self: end; }
  .how-it-works ol { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(2.25rem, 4vw, 3.5rem); }
  .how-it-works li { grid-template-columns: minmax(0, 1fr); gap: 0.7rem; }
  .replay-index, .replay-detail { padding-block: 1rem 5rem; }
}
@media (min-width: 78rem) {
  .replay-detail.shell { width: min(calc(100% - 2rem), 90rem); }
  .replay-detail > .breadcrumbs { width: min(100%, var(--replay-workspace-width)); margin-inline: auto; }
  .replay-detail-heading, .replay-workspace { width: min(100%, var(--replay-workspace-width)); grid-template-columns: minmax(0, var(--replay-board-width)) minmax(18rem, var(--replay-score-width)); justify-items: stretch; gap: var(--replay-workspace-gap); margin-inline: auto; }
  .replay-detail-heading > div, .replay-position { grid-column: 1; }
  .replay-download { grid-column: 2; justify-self: end; align-self: end; }
  .replay-position { width: 100%; }
  .replay-score { width: 100%; position: sticky; top: 1rem; grid-column: 2; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; }
}
@media (prefers-contrast: more) {
  :root { --ink-muted: #cbd2cc; --line: #728077; --line-strong: #a7b1a9; --accent: #a0d0ab; --danger: #ff9d93; --focus: #a4ddf8; }
}
@media (forced-colors: active) {
  .brand-mark, .footer-mark { forced-color-adjust: none; }
  input, .preset, .choice-grid .choice-input + label, .color-choice .choice-input + label { border: 1px solid ButtonText; }
}