.site-header { min-height: 56px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; column-gap: 1rem; }
/* Main navigation: a single scrollable row under the wordmark on phones, beside it from tablet width up. */
.site-nav { width: calc(100% + 1rem); display: flex; gap: 0.15rem; margin-inline: -0.5rem; overflow-x: auto; scrollbar-width: none; }
.site-nav::-webkit-scrollbar { display: none; }
.site-nav a { min-height: 44px; display: inline-flex; flex: 0 0 auto; align-items: center; padding-inline: 0.6rem; color: var(--ink-muted); border-radius: var(--radius-control); font-size: 0.76rem; font-weight: 720; white-space: nowrap; text-decoration: none; transition: color 140ms ease, background 140ms ease; }
.site-nav a[aria-current="page"] { color: var(--ink); background: var(--surface); }
.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: 34px; height: 34px; 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: 1.25rem; padding-block: 2rem max(2rem, 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: 44px; 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: 36px; height: 36px; 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: var(--radius-control); 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; }
.hero { display: grid; gap: 1.25rem; align-items: center; padding-block: 0.25rem 2.5rem; }
.hero-copy { min-width: 0; }
.hero.form-first .create-card-wrap { order: -1; }
.hero h1 { max-width: 18ch; margin-bottom: 0.75rem; font-size: clamp(2.1rem, 8.5vw, 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: none; flex-wrap: wrap; gap: 0.55rem 1rem; margin-top: 1rem; 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-radius: var(--radius-surface); 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); }
.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; }
.text-link { min-height: 44px; display: inline-flex; align-items: center; justify-self: start; gap: 0.55rem; border-radius: var(--radius-control); font-size: 0.78rem; font-weight: 760; text-underline-offset: 0.2em; }
.text-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-radius: var(--radius-surface); background: var(--surface); }
.homepage-replay-card.featured { min-height: 21rem; grid-template-rows: auto 1fr auto; }
.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: var(--radius-item); 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, .faq-list { display: grid; gap: 2.5rem; margin: 0; }
.online-chess-faq dl > div, .faq-list > div { padding: 0; border: 0; }
.online-chess-faq dt, .faq-list dt, .content-definitions dt { margin-bottom: 0.45rem; color: var(--ink); font-size: 0.98rem; font-weight: 760; }
.online-chess-faq dd, .faq-list dd, .content-definitions 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-radius: var(--radius-surface); background: var(--surface); box-shadow: var(--shadow-md); }
.card-heading { margin-bottom: 0.85rem; }
.card-heading h2 { margin: 0 0 0.2rem; font-size: clamp(1.3rem, 5.5vw, 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; }
.choice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.45rem; }
.choice-grid .choice-input + label { min-height: 48px; 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: var(--radius-control); 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; }
/* A chosen option is outlined, not filled: the one filled control on the form stays the submit button. */
.choice-grid .choice-input:checked + label, .preset-grid .choice-input:checked + .preset, .color-choice .choice-input:checked + label { color: var(--accent-ink); background: var(--accent-soft); box-shadow: inset 0 0 0 2px var(--accent); }
.choice-grid .choice-input:checked + label strong, .preset-grid .choice-input:checked + .preset strong { color: var(--ink); }
.choice-grid .choice-input:checked + label span, .preset-grid .choice-input:checked + .preset span, .color-choice .choice-input:checked + label span { color: var(--accent-ink); }
.preset-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.45rem; }
/* Three columns; "Correspondence" takes the last row so its description never wraps. Very narrow cards fall back to two columns. */
.preset-grid > .preset:last-of-type { grid-column: 1 / -1; }
.preset, .color-choice .choice-input + label { min-height: 46px; margin: 0; padding: 0.45rem; color: var(--ink-muted); border: 1px solid transparent; border-radius: var(--radius-control); 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: 48px; 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; }
.submit-error { margin: 0 0 0.85rem; }
.submit-error.field-error { margin: 0.45rem 0 0; }
.file-button { position: relative; overflow: hidden; }
.file-button input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.file-button:focus-within { outline: 2px solid var(--focus); outline-offset: 2px; }
.tab-links { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-block: 1rem; }
.tab-links a { min-height: 44px; display: inline-flex; align-items: center; gap: 0.4rem; padding: 0 0.9rem; color: var(--ink); border-radius: var(--radius-pill); background: var(--surface); font-size: 0.84rem; font-weight: 650; text-decoration: none; }
.tab-links a[aria-current="page"] { color: var(--on-accent); background: var(--accent); font-weight: 760; }
.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: var(--radius-control); text-underline-offset: 0.2em; }
.breadcrumbs > span[aria-hidden="true"] { color: var(--line-strong); }
/* A trail that only leads back home repeats the main navigation on a phone, where every line above the content counts. */
@media (max-width: 34.999rem) {
  .breadcrumbs:not(:has(> a:nth-of-type(2))) { display: none; }
  /* The current page is the heading right below; the trail keeps only the way back. */
  .breadcrumbs > [aria-current="page"], .breadcrumbs > span[aria-hidden="true"]:has(+ [aria-current="page"]) { display: none; }
}
/* Editorial pages: one reading column, the same heading scale as the replay index, and a closing aside of related links. */
.content-page { display: grid; gap: 2.5rem; padding-block: 1rem 4rem; }
.content-heading { max-width: 46rem; padding-top: clamp(0.5rem, 4vw, 3rem); }
.content-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.5rem; }
.content-body { max-width: 46rem; min-width: 0; display: grid; gap: 3rem; }
.content-body h2, .replay-story h2 { margin: 0 0 0.85rem; font-size: clamp(1.35rem, 5vw, 1.75rem); font-weight: 760; letter-spacing: -0.035em; line-height: 1.15; }
.content-body p, .content-body li, .replay-story p { color: var(--ink-muted); font-size: 0.95rem; line-height: 1.75; }
.content-body p, .replay-story p { max-width: 68ch; margin: 0 0 1rem; }
.content-body a:not(.primary-action, .quiet-button, .hub-tile), .replay-story a { color: var(--ink); text-underline-offset: 0.2em; }
.content-steps { display: grid; gap: 1rem; margin: 0; padding-left: 1.25rem; }
.content-steps strong { color: var(--ink); }
.content-definitions { display: grid; gap: 1.5rem; margin: 0 0 1.5rem; }
.content-definitions > div { padding: 0; }
.content-links { display: grid; gap: 0.15rem; margin: 0; padding: 0; list-style: none; }
.content-links a { min-height: 44px; display: inline-flex; align-items: center; color: var(--ink); font-size: 0.86rem; font-weight: 700; text-underline-offset: 0.2em; }
.content-aside { max-width: 46rem; padding: 1.25rem 1.5rem; border-radius: var(--radius-surface); background: var(--surface); }
.content-aside h2 { margin: 0 0 0.35rem; font-size: 1rem; font-weight: 780; }
.content-note { padding: 0.85rem 1rem; border-radius: var(--radius-control); background: var(--surface); font-size: 0.86rem; }
.content-cta { margin-inline: 0; scroll-margin-top: 1rem; }
.content-diagram { margin: 0 0 1.25rem; }
.content-diagram { max-width: 22.5rem; }
.content-diagram svg, .replay-story-diagram img { width: 100%; height: auto; display: block; border-radius: var(--radius-surface); }
.content-diagram figcaption, .replay-story-diagram figcaption { margin-top: 0.5rem; color: var(--ink-muted); font-size: 0.72rem; }
.hub-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); gap: 0.75rem; margin: 0; padding: 0; list-style: none; }
.hub-tile { min-height: 100%; display: grid; align-content: start; gap: 0.3rem; padding: 1.1rem 1.2rem; color: var(--ink); border-radius: var(--radius-surface); background: var(--surface); text-decoration: none; transition: background 140ms ease; }
.hub-tile-code { color: var(--accent); font-size: 0.66rem; font-weight: 820; letter-spacing: 0.08em; }
.hub-tile strong { font-size: 1rem; letter-spacing: -0.02em; }
.hub-tile > span:last-child { color: var(--ink-muted); font-size: 0.76rem; }
.hub-links { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: 1.25rem; }
/* Replay detail sections below the board: generated summary with the final-position diagram, the PGN and related games. */
.replay-story, .replay-pgn, .replay-related { width: min(100%, var(--replay-workspace-width)); margin: 2.5rem auto 0; }
.replay-story { display: grid; gap: 1.5rem; padding: clamp(1.25rem, 4vw, 2rem); border-radius: var(--radius-surface); background: var(--surface); }
.replay-story-diagram { width: min(100%, 360px); margin: 0; }
.replay-pgn-heading { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.75rem; margin-bottom: 0.75rem; }
.replay-pgn-heading h2 { margin: 0; font-size: 1.15rem; font-weight: 780; letter-spacing: -0.02em; }
.replay-pgn pre { margin: 0; padding: 1rem 1.15rem; overflow-x: auto; color: var(--ink); border-radius: var(--radius-surface); background: var(--surface); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.76rem; line-height: 1.7; white-space: pre-wrap; overflow-wrap: anywhere; }
.replay-index { min-height: calc(100svh - 188px); padding-block: 1rem 4rem; }
.replay-index-heading { max-width: 42rem; padding-block: clamp(0.75rem, 5vw, 3.5rem) clamp(1.25rem, 5vw, 3rem); }
.replay-index-heading h1, .content-heading h1 { margin-bottom: 0.6rem; font-size: clamp(1.9rem, 7.5vw, 4rem); font-weight: 760; letter-spacing: -0.05em; line-height: 1.02; }
.replay-index-heading > p:not(.eyebrow), .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-radius: var(--radius-surface); 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, .replay-card h3 { margin-bottom: 0.55rem; font-size: 1.2rem; letter-spacing: -0.025em; line-height: 1.2; }
.replay-card h2 a, .replay-card h3 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: var(--radius-control); color: var(--ink); font-weight: 720; }
.pagination a:last-child { justify-self: end; }
.message-card { max-width: 38rem; display: grid; justify-items: start; gap: 0.6rem; padding: clamp(1.25rem, 5vw, 2.5rem); border-radius: var(--radius-surface); background: var(--surface); }
.message-card > span { color: var(--accent); font-size: 1.4rem; }
.message-card h2 { max-width: 24ch; margin: 0; font-size: clamp(1.3rem, 5.5vw, 2rem); letter-spacing: -0.035em; line-height: 1.1; }
.message-card p { max-width: 44ch; margin: 0 0 0.5rem; color: var(--ink-muted); }
.message-card-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.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: 1rem; margin-inline: auto; padding-block: clamp(0.5rem, 4vw, 3rem) clamp(1rem, 4vw, 2.5rem); }
.replay-detail-heading h1 { max-width: 20ch; margin-bottom: 0.6rem; font-size: clamp(1.8rem, 7vw, 3.6rem); font-weight: 760; letter-spacing: -0.06em; line-height: 0.98; }
.replay-download { justify-self: start; }
.replay-heading-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; justify-self: start; }
.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-opening { display: block; margin-top: 0.15rem; overflow: hidden; color: var(--ink); font-weight: 650; text-overflow: ellipsis; white-space: nowrap; }
.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: var(--radius-control); 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-radius: var(--radius-surface); 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: var(--radius-pill); 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; padding: 0.65rem; scrollbar-gutter: stable; }
.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: var(--radius-control); background: var(--surface); font-size: 0.78rem; font-weight: 760; text-decoration: none; }
.replay-next-actions span { color: var(--accent); }
.publish-field, .option-field { margin: 0 0 0.85rem; }
/* PGN import: one form, the exact place of a problem, and the other games of a file. */
.import-page { padding-bottom: clamp(2rem, 8vw, 4rem); }
.import-form { max-width: 46rem; display: grid; gap: 1rem; padding: clamp(1rem, 4vw, 1.5rem); border-radius: var(--radius-surface); background: var(--surface); box-shadow: var(--shadow-md); }
/* 16px at least: iOS Safari zooms the page into any text field set smaller and leaves it zoomed after the keyboard closes. */
.import-form textarea::placeholder { opacity: 0.55; }
.import-form textarea { min-height: 10rem; resize: vertical; font: max(16px, 0.8rem)/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; }
.import-form input[type="file"] { max-width: 100%; color: var(--ink-muted); font-size: 0.8rem; }
.import-form .primary-action { justify-self: start; }
.import-error, .import-notice { max-width: 46rem; margin: 0 0 1rem; padding: 0.85rem 1rem; border-radius: var(--radius-control); background: var(--danger-soft); color: var(--ink); }
.import-notice { background: var(--accent-soft); }
.import-error h2 { margin: 0 0 0.35rem; font-size: 1rem; }
.import-error p { margin: 0.2rem 0; font-size: 0.85rem; }
.import-error-place { color: var(--ink-muted); }
.import-error-fen code { overflow-wrap: anywhere; font-size: 0.78rem; }
.import-error-fen span { color: var(--ink-muted); }
.import-games { max-width: 46rem; margin-top: 1.5rem; }
.import-games h2 { font-size: 1.05rem; }
.import-game-rows { display: grid; gap: 0.35rem; margin: 0; padding: 0; list-style: none; }
.import-game-rows li { min-height: 44px; display: flex; flex-wrap: wrap; align-items: center; gap: 0.35rem 0.75rem; padding: 0.35rem 0.75rem; border-radius: var(--radius-control); background: var(--surface); font-size: 0.82rem; }
.import-game-rows li.current { outline: 2px solid var(--accent); }
.import-game-rows form { margin-left: auto; }
.import-game-number, .import-game-result, .import-game-problem, .import-games-more { color: var(--ink-muted); }
.import-game-players { flex: 1 1 12rem; font-weight: 650; overflow-wrap: anywhere; }
.import-game-done { margin-left: auto; color: var(--accent); font-weight: 700; }
.import-report { margin-top: 2rem; padding-top: 1rem; border-top: 1px solid var(--line); color: var(--ink-muted); font-size: 0.8rem; }
.import-report form { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 1rem; }
.import-report p { margin: 0; }
@supports selector(form:has(input:checked)) {
  .create-form .difficulty-field, .create-form .publish-field, .create-form .custom-time-fields, .create-form .correspondence-fields { display: none; }
  .create-form:has(#time-correspondence:checked) .correspondence-fields { display: block; }
  .create-form .correspondence-computer-note { display: none; }
  .create-form:has(#opponent-computer:checked):has(#time-correspondence:checked) .correspondence-computer-note { display: block; }
  .create-form:has(#opponent-computer:checked):has(#time-correspondence:checked) .correspondence-fields { display: none; }
  .create-form:has(#opponent-computer:checked):has(#time-correspondence:checked) button[type="submit"] { opacity: 0.45; pointer-events: none; }
  .create-form .delay-label, .create-form:has(#clock-bronstein:checked) .increment-label { display: none; }
  .create-form:has(#clock-bronstein:checked) .delay-label { display: inline; }
  .create-form:has(#opponent-computer:checked) .difficulty-field, .create-form:has(#opponent-computer:checked) .publish-field { display: block; }
  .create-form:has(#time-custom:checked) .custom-time-fields { display: grid; }
  .create-form .chess960-position { display: none; }
  .create-form:has(#variant-chess960:checked) .chess960-position { display: grid; }
  /* An invalid value stays in view even after another choice hides its field: the browser blocks the submit on it and can only
     point at a field it can show. */
  .create-form .custom-time-fields:has(input:invalid) { display: grid; }
  .create-form .chess960-position:has(input:invalid) { display: grid; }
}
.chess960-position { margin: 0.55rem 0 0; }
/* Invitation page: the board beside the challenge, stacked on phones; one primary action per state. */
.invite-page { min-height: calc(100vh - 188px); min-height: calc(100svh - 188px); display: grid; place-items: center; padding-block: clamp(1rem, 5vw, 3rem); }
.invite-card { width: min(100%, 60rem); display: grid; gap: clamp(1.25rem, 4vw, 2.5rem); padding: clamp(1rem, 4vw, 2rem); border-radius: var(--radius-surface); background: var(--surface); box-shadow: var(--shadow-md); }
.invite-board { width: min(100%, 26rem); margin: 0 auto; }
/* Phones: who invites and the Accept button come first; the board, a preview from the guest's side, follows at a modest size. */
@media (max-width: 47.999rem) {
  .invite-board { width: min(100%, 15rem); order: 1; }
  .invite-page { place-items: start center; }
}
.invite-board svg { width: 100%; height: auto; display: block; border-radius: var(--radius-item); }
.invite-body { min-width: 0; display: grid; align-content: center; }
.invite-body h1 { margin: 0 0 0.6rem; font-size: clamp(1.5rem, 6vw, 2.6rem); font-weight: 780; letter-spacing: -0.045em; line-height: 1.05; overflow-wrap: anywhere; }
.invite-lede { margin: 0 0 1.25rem; color: var(--ink-muted); }
.invite-accept { margin: 0; }
.invite-actions, .invite-ctas { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.invite-actions .primary-action, .invite-ctas .primary-action { flex: 1 1 12rem; }
.invite-note { margin: 0.75rem 0 0; color: var(--danger); font-size: 0.8rem; }
.invite-body .privacy-note { margin-top: 1rem; text-align: start; }
@media (hover: hover) {
  .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 h3 a:hover, .text-link:hover { color: var(--accent); }
  .homepage-replay-card:hover, .replay-card:hover { background: var(--surface-subtle); }
  .replay-card h2 a:hover, .replay-card h3 a:hover, .breadcrumbs a:hover, .content-links a:hover { color: var(--accent); }
  .site-nav a:hover { color: var(--ink); background: var(--accent-soft); }
  .hub-tile:hover, .tab-links a:not([aria-current="page"]):hover { background: var(--surface-subtle); }
  .replay-controls a:hover, .replay-next-actions a:hover { background: var(--accent-soft); }
}
@container (max-width: 19rem) {
  .preset-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .preset-grid > .preset:first-of-type, .preset-grid > .preset:nth-last-of-type(-n+2) { grid-column: 1 / -1; }
}
@media (min-width: 35rem) {
  /* The links wrap inside their own column; an auto column would grow to the links' full length and squeeze the brand away. */
  .site-footer-inner { grid-template-columns: minmax(13rem, 1fr) minmax(0, 2.6fr); align-items: center; gap: 2rem; padding-block: 3.25rem; }
  .footer-nav { justify-content: flex-end; }
  .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: 48rem) {
  .invite-card { grid-template-columns: minmax(0, 26rem) minmax(0, 1fr); }
  .site-nav { width: auto; order: 0; margin-inline: 0 -0.6rem; }
}
@media (min-width: 45rem) {
  .hero { gap: 2rem; padding-block: 3rem; }
  .trust-row { display: flex; }
  .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; }
  /* The hero is as tall as its content: copy and form share one centre line instead of floating in a viewport-tall band. */
  .hero { grid-template-columns: minmax(0, 1fr) minmax(25rem, 30.5rem); align-items: center; gap: clamp(3rem, 7vw, 6rem); padding-block: clamp(1.5rem, 4vh, 3rem) clamp(2.5rem, 6vh, 4rem); }
  .hero.form-first .create-card-wrap { order: 0; }
  .product-story { padding-block: 3rem 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; }
  .text-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; }
  .replay-story { grid-template-columns: minmax(0, 1fr) 300px; align-items: start; gap: 2.5rem; }
  .content-page { grid-template-columns: minmax(0, 46rem) minmax(14rem, 18rem); align-items: start; column-gap: clamp(2rem, 5vw, 4rem); }
  .content-page > .breadcrumbs, .content-heading { grid-column: 1 / -1; }
  .content-aside { position: sticky; top: 1rem; }
}
@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-heading-actions { 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 (forced-colors: active) {
  .brand-mark, .footer-mark { forced-color-adjust: none; }
  .preset, .choice-grid .choice-input + label, .color-choice .choice-input + label { border: 1px solid ButtonText; }
  /* Surfaces are told apart by fill alone, which forced colors remove; give them back an edge there. */
  .play-option, .homepage-replay-card, .create-card, .replay-card, .replay-score { border: 1px solid CanvasText; }
}
.replay-filters { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 11rem), 1fr)); gap: 0.75rem; align-items: end; margin-bottom: 1.5rem; padding: 1rem; border-radius: var(--radius-surface); background: var(--surface); }
.replay-filters label { display: grid; gap: 0.3rem; min-width: 0; }
.replay-filters label > span { color: var(--ink-muted); font-size: 0.68rem; font-weight: 760; letter-spacing: 0.06em; text-transform: uppercase; }
.replay-filters select, .analysis-run select { min-height: 44px; padding: 0 0.6rem; color: var(--ink); border: 1px solid var(--line-strong); border-radius: var(--radius-control); background: var(--surface-subtle); font: inherit; }
.replay-filters select { width: 100%; }
.replay-filter-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.replay-filter-count { grid-column: 1 / -1; margin: 0; color: var(--ink-muted); font-size: 0.85rem; }
.days-choice { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.45rem; }
.days-choice label { min-height: 56px; display: grid; place-content: center; gap: 0.1rem; padding: 0.55rem; border: 1px solid var(--line); border-radius: var(--radius-control); background: var(--surface-subtle); text-align: center; cursor: pointer; transition: background 140ms ease, color 140ms ease; }
.days-choice label strong { font-size: 0.86rem; }
.days-choice label span { color: var(--ink-muted); font-size: 0.68rem; }
.days-choice .choice-input:checked + label { color: var(--ink); border-color: var(--accent); background: var(--accent-soft); box-shadow: inset 0 0 0 1px var(--accent); }
.days-choice .choice-input:checked + label span { color: var(--accent-ink); }
.field-hint { margin: 0.55rem 0 0; color: var(--ink-muted); font-size: 0.74rem; line-height: 1.5; }
.clock-mode-field { grid-column: 1 / -1; }
.segmented-field { min-width: 0; margin: 0; padding: 0; border: 0; }
.segmented-field legend { margin-bottom: 0.35rem; color: var(--ink-muted); font-size: 0.7rem; font-weight: 700; }
.segmented { display: inline-grid; grid-auto-flow: column; gap: 0.2rem; padding: 0.2rem; border-radius: var(--radius-pill); background: var(--surface-subtle); }
.segmented label { min-height: 36px; display: inline-flex; align-items: center; padding-inline: 0.9rem; border-radius: var(--radius-pill); color: var(--ink-muted); font-size: 0.76rem; font-weight: 700; cursor: pointer; }
.segmented .choice-input:checked + label { color: var(--on-accent); background: var(--accent); }
.correspondence-computer-note { margin: -0.25rem 0 0.85rem; padding: 0.6rem 0.75rem; border-radius: var(--radius-control); color: var(--danger); background: var(--danger-soft); font-size: 0.76rem; font-weight: 650; }
/* My games: the device's games, grouped by what they wait for. */
.my-games { padding-bottom: clamp(2rem, 8vw, 5rem); }
.my-games-heading { max-width: 42rem; padding-block: clamp(1rem, 5vw, 3rem) 1rem; }
.my-games-heading h1 { margin-bottom: 0.4rem; font-size: clamp(1.9rem, 7vw, 3rem); font-weight: 760; letter-spacing: -0.05em; line-height: 1.02; }
.my-games-heading > p:last-child { margin: 0; color: var(--ink-muted); font-size: 0.9rem; line-height: 1.55; }
.my-games-loading { display: grid; place-items: center; gap: 0.5rem; min-height: 12rem; color: var(--ink-muted); }
.my-games-loading span { font-size: 2rem; animation: my-games-pulse 1.2s ease-in-out infinite alternate; }
@keyframes my-games-pulse { from { opacity: 0.35; } to { opacity: 1; } }
.my-games-toolbar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.75rem; margin-bottom: 0.5rem; }
.my-games-count { margin: 0; font-weight: 700; }
.my-games-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.my-games-notice { margin: 0.5rem 0; padding: 0.6rem 0.8rem; border-radius: var(--radius-control); background: var(--accent-soft); color: var(--accent-ink); font-size: 0.82rem; }
.my-games-export-note, .my-games-hint { margin: 0 0 1.5rem; color: var(--ink-muted); font-size: 0.74rem; line-height: 1.5; }
.my-games-section { margin-top: 1.75rem; }
.my-games-section h2 { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.75rem; font-size: 1.05rem; letter-spacing: -0.01em; }
.count-badge { min-width: 1.6rem; padding: 0.1rem 0.45rem; border-radius: var(--radius-pill); background: var(--surface-subtle); color: var(--ink-muted); font-size: 0.72rem; text-align: center; }
.my-games-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 22rem), 1fr)); gap: 0.6rem; margin: 0; padding: 0; list-style: none; }
.my-game { position: relative; border-radius: var(--radius-surface); background: var(--surface); transition: background 140ms ease, translate 140ms ease; }
.my-game:hover { background: var(--surface-subtle); }
.my-game.your-turn { box-shadow: inset 3px 0 0 var(--accent); }
.my-game-link { display: grid; grid-template-columns: 4.5rem minmax(0, 1fr) auto; align-items: center; gap: 0.9rem; padding: 0.8rem; color: inherit; text-decoration: none; border-radius: inherit; }
.my-game-link:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.my-game-text { display: grid; gap: 0.18rem; min-width: 0; }
.my-game-text strong { overflow: hidden; font-size: 0.95rem; text-overflow: ellipsis; white-space: nowrap; }
.my-game-meta, .my-game-state { overflow: hidden; color: var(--ink-muted); font-size: 0.74rem; text-overflow: ellipsis; white-space: nowrap; }
.my-game.your-turn .my-game-state { color: var(--accent); font-weight: 700; }
.my-game-deadline { align-self: start; padding: 0.2rem 0.5rem; border-radius: var(--radius-pill); background: var(--surface-subtle); color: var(--ink-muted); font-size: 0.7rem; font-variant-numeric: tabular-nums; font-weight: 700; white-space: nowrap; }
.my-game-deadline.urgent { background: var(--danger-soft); color: var(--danger); }
.my-game-forget { position: absolute; right: 0.8rem; bottom: 0; min-height: 44px; }
.my-games-unavailable { display: grid; gap: 0.4rem; margin: 0; padding: 0; list-style: none; }
.my-games-unavailable li { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 0.4rem 0.8rem; border-radius: var(--radius-control); background: var(--surface); }
@media (prefers-reduced-motion: reduce) { .my-games-loading span { animation: none; } .my-game { transition: none; } }
/* Operator pages. */
.admin-sign-in { min-height: calc(100svh - 188px); display: grid; place-items: center; padding-block: 2rem; }
.admin-card { display: grid; gap: 0.9rem; width: min(100%, 26rem); text-align: left; }
.admin-imports { padding-block: clamp(1.5rem, 6vw, 3rem); }
.admin-heading { display: flex; flex-wrap: wrap; align-items: flex-start; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.admin-heading h1 { margin-bottom: 0.5rem; font-size: clamp(2rem, 7vw, 3rem); letter-spacing: -0.04em; }
.admin-heading p { max-width: 44rem; margin: 0; color: var(--ink-muted); line-height: 1.55; }
.admin-table-wrap { overflow-x: auto; border-radius: var(--radius-surface); background: var(--surface); }
.admin-table { width: 100%; border-collapse: collapse; font-size: 0.82rem; }
.admin-table th, .admin-table td { padding: 0.7rem 0.8rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.admin-table thead th { color: var(--ink-muted); font-size: 0.68rem; letter-spacing: 0.06em; text-transform: uppercase; }
.admin-table th[scope="row"] { font-weight: 600; }
.admin-table th[scope="row"] small { display: block; margin-top: 0.2rem; color: var(--ink-muted); font-weight: 500; }
.admin-table .numeric { text-align: right; font-variant-numeric: tabular-nums; }
.admin-table tr.highlight { background: var(--accent-soft); }
.admin-actions { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.admin-actions .primary-action, .admin-actions .quiet-button, .admin-actions .danger-action { min-height: 36px; padding: 0.35rem 0.7rem; font-size: 0.74rem; }
.admin-state { display: inline-block; padding: 0.15rem 0.5rem; border-radius: var(--radius-pill); background: var(--surface-subtle); color: var(--ink-muted); font-size: 0.72rem; font-weight: 700; white-space: nowrap; }
.admin-state.indexed { color: var(--accent-ink); background: var(--accent-soft); }
.admin-state.reported, .admin-state.hidden { color: var(--danger); background: var(--danger-soft); }