/* Hallmark · genre: playful · macrostructure: Narrative Workflow · theme: Hum · enrichment: Tier-A CSS piece mark · nav: N12 · footer: Ft5
 * hero: H2 Split Diptych (7/5 · right = proof column · divider = negative space) · features: F4 Step sequence (1.0/2.0/3.0 · vertical · connector line) · cta: C2 inline form (fields=2 · submit end-of-row · helper below)
 * audience: 観る将・将棋未経験〜級位者 · use: 事前登録 · tone: playful
 * Hallmark · pre-emit critique: P4 H4 E4 S4 R4 V4 */
@import url("tokens.css");

html { overflow-x: clip; scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: clip;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "palt";
}
*, *::before, *::after { box-sizing: border-box; min-width: 0; }
h1, h2, h3 { font-family: var(--font-display); font-style: normal; font-weight: 700; letter-spacing: -0.02em; line-height: 1.25; margin: 0; overflow-wrap: anywhere; }
p { margin: 0; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.2em; text-decoration-color: var(--color-accent-2); }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 3px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.mono { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.08em; text-transform: uppercase; color: var(--color-muted); font-variant-numeric: tabular-nums; }
.wrap { max-width: 68rem; margin-inline: auto; padding-inline: var(--page-gutter); }

/* ---------- N12 banner + retracting nav ---------- */
.nav { position: fixed; inset: 0 0 auto; z-index: var(--z-sticky); transform: translateY(0); transition: transform 320ms var(--ease-out); }
.nav.is-compact { transform: translateY(calc(var(--banner-h) * -1)); }
.nav.is-dismissed .nav__banner { display: none; }
.nav__banner { height: var(--banner-h); display: flex; align-items: center; justify-content: center; gap: var(--space-sm); padding-inline: var(--space-md); background: var(--color-ink); color: var(--color-paper); font-size: var(--text-sm); }
.nav__banner-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--color-accent); flex: none; }
.nav__banner-text { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nav__banner-x { margin-inline-start: var(--space-xs); background: none; border: 0; color: inherit; font: inherit; cursor: pointer; min-width: 44px; min-height: 44px; border-radius: var(--radius-pill); }
.nav__banner-x:hover, .nav__banner-x:focus-visible { background: var(--color-ink-soft); }
.nav__banner-x:active { transform: translateY(1px); }
.nav__bar { height: var(--bar-h); background: var(--color-paper); border-bottom: var(--rule-hair) solid var(--color-rule); }
.nav__bar-inner { height: 100%; max-width: 68rem; margin-inline: auto; padding-inline: var(--page-gutter); display: flex; align-items: center; justify-content: space-between; gap: var(--space-md); }
.brand { display: inline-flex; align-items: center; gap: var(--space-xs); text-decoration: none; font-family: var(--font-display); font-weight: 700; font-size: var(--text-md); letter-spacing: -0.01em; white-space: nowrap; }
.brand__mark { width: 18px; height: 20px; background: var(--color-accent); clip-path: polygon(50% 0, 92% 22%, 100% 100%, 0 100%, 8% 22%); flex: none; }
.brand__sub { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-muted); letter-spacing: 0.06em; }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-xs); min-height: 48px; padding: 0 var(--space-lg); border-radius: var(--radius-pill); border: 2px solid var(--color-ink); font: inherit; font-weight: 700; white-space: nowrap; cursor: pointer; text-decoration: none; color: var(--color-ink); background: var(--color-accent); box-shadow: var(--shadow-contact); transition: transform var(--dur-short) var(--ease-out), background-color var(--dur-micro) var(--ease-out); }
.btn:hover { transform: translateY(-2px); background: var(--color-accent-deep); }
.btn:active { transform: translateY(1px); transition-duration: 60ms; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }
.btn--quiet { background: transparent; box-shadow: none; border: var(--rule-hair) solid var(--color-rule); }
.btn--quiet:hover { background: var(--color-paper-2); transform: none; }
.btn--sm { min-height: 44px; padding-inline: var(--space-md); font-size: var(--text-sm); }

/* ---------- hero (H2 split diptych) ---------- */
.hero { padding-top: calc(var(--banner-h) + var(--bar-h) + var(--space-2xl)); padding-bottom: var(--space-xl); }
.hero__grid { display: grid; grid-template-columns: 7fr 5fr; gap: var(--space-2xl); align-items: center; }
.hero__kicker { font-size: var(--text-sm); font-weight: 700; color: var(--color-muted); margin-bottom: var(--space-md); }
.hero h1 { font-size: var(--text-display); max-width: 16em; }
.hero h1 .u { background-image: linear-gradient(var(--color-accent), var(--color-accent)); background-repeat: no-repeat; background-size: 100% 0.32em; background-position: 0 92%; -webkit-box-decoration-break: clone; box-decoration-break: clone; }
.hero__lede { margin-top: var(--space-lg); max-width: var(--measure); color: var(--color-ink-soft); font-size: var(--text-md); }
.hero__actions { margin-top: var(--space-xl); display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-md); }
.hero__note { font-size: var(--text-sm); color: var(--color-muted); }

/* proof column — the only A/B variable */
.entry { background: var(--color-paper-2); border-radius: var(--radius-card); padding: var(--space-lg); box-shadow: var(--shadow-ambient); }
.entry__head { margin-bottom: var(--space-md); }
.entry__title { font-weight: 700; font-size: var(--text-md); }
.chips { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-sm); margin: 0; padding: 0; list-style: none; }
.chip { width: 100%; display: grid; gap: var(--space-3xs); text-align: left; padding: var(--space-sm) var(--space-md); min-height: 64px; border-radius: 14px; border: 2px solid transparent; background: var(--color-paper); font: inherit; color: inherit; cursor: pointer; transition: transform var(--dur-short) var(--ease-out), border-color var(--dur-micro) var(--ease-out), background-color var(--dur-micro) var(--ease-out); }
.chip:hover { transform: translateY(-2px); background: var(--color-accent-2-soft); }
.chip[aria-pressed="true"] { border-color: var(--color-ink); background: var(--color-accent); }
.chip:active { transform: translateY(1px); }
.chip:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }
.chip__name { font-weight: 700; }
.chip__hint { font-size: var(--text-xs); color: var(--color-muted); line-height: 1.4; }
.entry__foot { margin-top: var(--space-md); font-size: var(--text-sm); color: var(--color-muted); }

.lesson-list { margin: 0; padding: 0; list-style: none; display: grid; gap: var(--space-xs); counter-reset: lesson; }
.lesson-list li { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: var(--space-sm); padding: var(--space-sm) 0; border-bottom: var(--rule-hair) solid var(--color-rule); }
.lesson-list li::before { counter-increment: lesson; content: counter(lesson); font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-muted); width: 1.5em; }
.lesson-list .tag { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.06em; padding: var(--space-3xs) var(--space-xs); border-radius: var(--radius-pill); background: var(--color-mint-soft); color: var(--color-success); }
.lesson-list li.is-goal { border-bottom: 0; font-weight: 700; }
.lesson-list li.is-goal .tag { background: var(--color-ink); color: var(--color-paper); }

/* ---------- stages (F4 step sequence · Narrative Workflow) ---------- */
.stages { padding-block: var(--space-3xl) var(--space-2xl); background: var(--color-paper-2); }
.stages__head { max-width: var(--measure); margin-bottom: var(--space-xl); }
.stages__head h2 { font-size: var(--text-2xl); }
.stages__head p { margin-top: var(--space-md); color: var(--color-ink-soft); }
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-xl); position: relative; }
.steps::before { content: ""; position: absolute; left: calc(1.125rem - 1px); top: 1.5rem; bottom: 1.5rem; width: 2px; background: var(--color-rule); }
.step { display: grid; grid-template-columns: 2.25rem 1fr; gap: var(--space-md); align-items: start; position: relative; }
.step__n { width: 2.25rem; height: 2.25rem; border-radius: 50%; background: var(--color-paper); border: 2px solid var(--color-ink); display: grid; place-items: center; font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 700; }
.step__body { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: var(--space-lg); align-items: start; }
.step h3 { font-size: var(--text-xl); }
.step p { margin-top: var(--space-sm); color: var(--color-ink-soft); max-width: var(--measure); }
.step__fig { background: var(--color-paper); border-radius: var(--radius-card); padding: var(--space-md); display: grid; gap: var(--space-sm); }
.step:nth-child(2) .step__body { grid-template-columns: 0.9fr 1.1fr; }
.step:nth-child(2) .step__fig { order: -1; }

/* mini board figure (Tier-A CSS) */
.board { display: grid; grid-template-columns: repeat(9, minmax(0, 1fr)); aspect-ratio: 1; background: var(--color-board); border: 2px solid var(--color-board-line); border-radius: 6px; overflow: hidden; }
.board span { border: 0.5px solid var(--color-board-line); display: grid; place-items: center; font-size: clamp(0.55rem, 1.6vw, 0.95rem); font-weight: 700; color: var(--color-ink); }
.board .p { background: var(--color-piece); border-radius: 3px; margin: 12%; clip-path: polygon(50% 0, 90% 18%, 100% 100%, 0 100%, 10% 18%); }
.board .p.g { transform: rotate(180deg); }
.board .hl { background: var(--color-accent); }
.board .ok { background: var(--color-mint); }
.fig__cap { font-size: var(--text-xs); color: var(--color-muted); font-family: var(--font-mono); letter-spacing: 0.04em; }
.feedback { display: grid; gap: var(--space-2xs); padding-top: var(--space-sm); border-top: var(--rule-hair) solid var(--color-rule); font-size: var(--text-sm); }
.feedback b { color: var(--color-success); }

/* ladder */
.ladder { display: grid; gap: 6px; }
.ladder span { display: block; height: 14px; border-radius: var(--radius-pill); background: var(--color-paper-3); }
.ladder span.done { background: var(--color-mint); }
.ladder span.now { background: var(--color-accent); }
.ladder__labels { display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-muted); }

/* ---------- two axes ---------- */
.axes { padding-block: var(--space-3xl) var(--space-2xl); }
.axes__grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-xl); align-items: start; }
.axes h2 { font-size: var(--text-2xl); max-width: 18em; }
.axes__copy { margin-top: var(--space-md); color: var(--color-ink-soft); max-width: var(--measure); }
.meter { display: grid; gap: var(--space-md); }
.meter__row { display: grid; gap: 6px; }
.meter__label { display: flex; justify-content: space-between; align-items: baseline; }
.meter__label b { font-weight: 700; }
.meter__bar { height: 14px; border-radius: var(--radius-pill); background: var(--color-paper-3); overflow: hidden; }
.meter__bar i { display: block; height: 100%; border-radius: inherit; }
.meter__bar .keep { width: 62%; background: var(--color-mint); }
.meter__bar .rate { width: 48%; background: var(--color-accent-2); }
.meter__hint { font-size: var(--text-sm); color: var(--color-muted); }

/* ---------- signup (C2 inline form) ---------- */
.signup { padding-block: var(--space-2xl) var(--space-3xl); background: var(--color-ink); color: var(--color-paper); }
.signup__grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: var(--space-2xl); align-items: center; }
.signup h2 { font-size: var(--text-2xl); color: var(--color-paper); }
.signup p { margin-top: var(--space-md); color: var(--color-on-dark); max-width: var(--measure); }
.signup .mono { color: var(--color-on-dark-muted); }
.form { display: grid; gap: var(--space-md); }
.form__row { display: grid; grid-template-columns: 1fr auto; gap: var(--space-sm); align-items: end; }
.field { display: grid; gap: 6px; }
.field label { font-size: var(--text-sm); font-weight: 700; color: var(--color-paper); }
.field input, .field select { font: inherit; min-height: 48px; padding: 0 var(--space-md); border-radius: var(--radius-input); border: 2px solid var(--color-dark-rule); background: var(--color-dark-2); color: var(--color-paper); transition: border-color var(--dur-short) var(--ease-out); }
.field input::placeholder { color: var(--color-on-dark-faint); }
.field input:focus-visible, .field select:focus-visible { border-color: var(--color-accent); outline-offset: 2px; }
.field select { appearance: none; -webkit-appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--color-paper) 50%), linear-gradient(135deg, var(--color-paper) 50%, transparent 50%); background-position: calc(100% - 20px) 55%, calc(100% - 14px) 55%; background-size: 6px 6px; background-repeat: no-repeat; padding-right: 2.5rem; }
.field.is-error input { border-color: var(--color-accent-3); }
.field__err { font-size: var(--text-sm); color: var(--color-on-dark-error); min-height: 1.5em; visibility: hidden; }
.field.is-error .field__err { visibility: visible; }
.form__fine { font-size: var(--text-xs); color: var(--color-on-dark-muted); }
.form__done { display: none; padding: var(--space-md) var(--space-lg); border-radius: var(--radius-card); background: var(--color-dark-2); }
.form__done b { color: var(--color-accent); }
.form[data-state="done"] .form__row, .form[data-state="done"] .field--extra, .form[data-state="done"] .form__fine { display: none; }
.form[data-state="done"] .form__done { display: block; }
.form[data-state="loading"] .btn { opacity: 0.7; pointer-events: none; }

/* ---------- FAQ ---------- */
.faq { padding-block: var(--space-2xl) var(--space-3xl); }
.faq h2 { font-size: var(--text-xl); margin-bottom: var(--space-lg); }
.faq dl { margin: 0; display: grid; gap: var(--space-lg); max-width: 48rem; }
.faq dt { font-weight: 700; font-size: var(--text-md); }
.faq dd { margin: var(--space-xs) 0 0; color: var(--color-ink-soft); max-width: var(--measure); }

/* ---------- footer (Ft5 statement) ---------- */
.foot { padding: var(--space-2xl) 0 var(--space-xl); background: var(--color-paper-2); }
.foot__line { font-family: var(--font-display); font-weight: 700; font-size: clamp(1.5rem, 3.5vw, 2.4rem); line-height: 1.2; letter-spacing: -0.02em; max-width: 20em; }
.foot__meta { margin-top: var(--space-xl); padding-top: var(--space-sm); border-top: var(--rule-hair) solid var(--color-rule); display: flex; justify-content: space-between; align-items: baseline; gap: var(--space-md); flex-wrap: wrap; font-size: var(--text-sm); color: var(--color-muted); }

/* ---------- reveal (one orchestrated entrance) ---------- */
.reveal { opacity: 0; transform: translateY(8px); animation: reveal var(--dur-long) var(--ease-out) forwards; animation-delay: calc(var(--i, 0) * 70ms); }
@keyframes reveal { to { opacity: 1; transform: none; } }

/* ---------- responsive ---------- */
@media (max-width: 60rem) {
  .hero__grid, .step__body, .axes__grid, .signup__grid { grid-template-columns: 1fr; }
  .step:nth-child(2) .step__body { grid-template-columns: 1fr; }
  .step:nth-child(2) .step__fig { order: 0; }
  .hero__grid { gap: var(--space-xl); }
}
@media (max-width: 40rem) {
  :root { --banner-h: 36px; --bar-h: 56px; }
  .hero { padding-top: calc(var(--banner-h) + var(--bar-h) + var(--space-xl)); }
  .chips { grid-template-columns: 1fr 1fr; }
  .chip { min-height: 56px; }
  .form__row { grid-template-columns: 1fr; }
  .form__row .btn { width: 100%; }
  .brand__sub { display: none; }
  .nav__banner { font-size: var(--text-xs); }
  .steps::before { display: none; }
  .step { grid-template-columns: 1fr; }
  .step__n { display: none; }
  .step h3::before { content: attr(data-n) " · "; font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-muted); letter-spacing: 0.08em; }
}
@media (max-width: 23rem) {
  .chips { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 150ms !important; animation-iteration-count: 1 !important; transition-duration: 150ms !important; }
  .reveal { animation: reveal-reduced 150ms linear forwards; }
  @keyframes reveal-reduced { to { opacity: 1; transform: none; } }
  .btn:hover, .chip:hover { transform: none; }
}