/*
 * Free Move — 公式サイト
 *
 * デザインの方向（docs/requirements.md §57）:
 *   playful / intelligent / experimental / minimal / tactile / physical /
 *   curious / slightly mysterious
 * 医療アプリ風にも、典型的なフィットネスアプリ風にもしない。
 */

:root {
  --ink: #14131a;
  --ink-soft: #4a4757;
  --ink-faint: #78748a;
  --paper: #fbfaf7;
  --paper-raised: #ffffff;
  --line: #e4e1da;

  --accent: #4d3df2;
  --accent-soft: #ece9ff;
  --glow-a: #6f5bff;
  --glow-b: #17c6b4;
  --glow-c: #ff8a5b;

  --radius: 14px;
  --measure: 68ch;

  --font-sans:
    -apple-system, BlinkMacSystemFont, 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Noto Sans JP',
    'Yu Gothic', Meiryo, system-ui, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f2f0ee;
    --ink-soft: #b9b4c6;
    --ink-faint: #857f95;
    --paper: #0d0c12;
    --paper-raised: #16151d;
    --line: #2a2833;

    --accent: #a89bff;
    --accent-soft: #221e3d;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

/* --- skip link --- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 0.6rem 1rem;
  z-index: 100;
}
.skip-link:focus {
  left: 0;
}

a {
  color: var(--accent);
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1px;
}
a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

/* --- layout --- */
.shell {
  width: min(100% - 2.5rem, 74rem);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.site-header .shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4rem;
  flex-wrap: wrap;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 660;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
  font-size: 1.02rem;
}

.wordmark .mark {
  width: 1.5rem;
  height: 1.5rem;
  flex: none;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.15rem;
  font-size: 0.92rem;
}

.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 1.5px solid transparent;
}

.site-nav a:hover,
.site-nav a[aria-current='page'] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

main {
  display: block;
}

.page {
  padding: 3.5rem 0 5rem;
}

.page .prose {
  max-width: var(--measure);
}

/* --- hero --- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 6rem 0 4.5rem;
  border-bottom: 1px solid var(--line);
}

.hero::before {
  content: '';
  position: absolute;
  inset: -35% -10% auto -10%;
  height: 130%;
  background:
    radial-gradient(40rem 28rem at 14% 10%, color-mix(in srgb, var(--glow-a) 46%, transparent), transparent 70%),
    radial-gradient(34rem 26rem at 86% 2%, color-mix(in srgb, var(--glow-b) 38%, transparent), transparent 68%),
    radial-gradient(28rem 22rem at 58% 92%, color-mix(in srgb, var(--glow-c) 32%, transparent), transparent 72%);
  pointer-events: none;
}

@media (prefers-color-scheme: dark) {
  .hero::before {
    background:
      radial-gradient(40rem 28rem at 14% 10%, color-mix(in srgb, var(--glow-a) 40%, transparent), transparent 70%),
      radial-gradient(34rem 26rem at 86% 2%, color-mix(in srgb, var(--glow-b) 26%, transparent), transparent 68%),
      radial-gradient(28rem 22rem at 58% 92%, color-mix(in srgb, var(--glow-c) 22%, transparent), transparent 72%);
  }
}

.hero .shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: 3rem;
}

.hero-copy {
  flex: 1 1 auto;
  min-width: 0;
}

/* 3 つの点が軌跡をたどって大きくなる。アイコンと同じモチーフ。 */
.hero-figure {
  flex: 0 0 auto;
  width: 20rem;
  height: 20rem;
  color: var(--accent);
  opacity: 0.9;
}

.hero-figure svg {
  width: 100%;
  height: 100%;
  display: block;
}

@media (max-width: 60rem) {
  .hero-figure {
    display: none;
  }
}

.hero h1 {
  margin: 0;
  font-size: clamp(3rem, 11vw, 5.5rem);
  line-height: 1.02;
  letter-spacing: -0.035em;
  font-weight: 700;
}

.hero .tagline {
  margin: 1.4rem 0 0;
  font-size: clamp(1.15rem, 3.4vw, 1.6rem);
  font-weight: 560;
  letter-spacing: 0.01em;
}

.hero .tagline-ja {
  margin: 0.35rem 0 0;
  color: var(--ink-soft);
  font-size: clamp(1rem, 2.6vw, 1.15rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.5rem;
}

.button {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
}

.button:hover {
  filter: brightness(1.08);
}

.button.secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

/* --- prose --- */
.prose h1 {
  font-size: clamp(2rem, 6vw, 2.9rem);
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin: 0 0 1.5rem;
}

.prose h2 {
  font-size: clamp(1.35rem, 4vw, 1.7rem);
  line-height: 1.35;
  letter-spacing: -0.015em;
  margin: 3rem 0 1rem;
}

.prose h3 {
  font-size: 1.12rem;
  margin: 2.25rem 0 0.6rem;
}

.prose h4 {
  font-size: 1rem;
  margin: 1.75rem 0 0.4rem;
  color: var(--ink-soft);
}

.prose p {
  margin: 0 0 1.15rem;
}

.prose ul,
.prose ol {
  margin: 0 0 1.4rem;
  padding-left: 1.35rem;
}

.prose li {
  margin-bottom: 0.4rem;
}

.prose hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 3rem 0;
}

.prose blockquote {
  margin: 1.6rem 0;
  padding: 0.2rem 0 0.2rem 1.25rem;
  border-left: 2px solid var(--accent);
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.prose blockquote p {
  margin: 0.45rem 0;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--accent-soft);
  padding: 0.12em 0.4em;
  border-radius: 5px;
}

.prose pre {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  overflow-x: auto;
}

.prose pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.7;
}

.table-scroll {
  overflow-x: auto;
  margin: 0 0 1.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.prose table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.94rem;
}

.prose th,
.prose td {
  text-align: left;
  padding: 0.7rem 0.95rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.prose th {
  background: var(--paper-raised);
  font-weight: 620;
  white-space: nowrap;
}

.prose tbody tr:last-child td {
  border-bottom: none;
}

/* --- meta line --- */
.page-meta {
  color: var(--ink-faint);
  font-size: 0.85rem;
  margin-bottom: 2.5rem;
  letter-spacing: 0.02em;
}

/* --- contact form --- */
.form {
  max-width: 34rem;
  margin-top: 2rem;
  display: grid;
  gap: 1.1rem;
}

.field {
  display: grid;
  gap: 0.4rem;
}

.field label {
  font-size: 0.9rem;
  font-weight: 600;
}

.field input,
.field select,
.field textarea {
  font: inherit;
  font-size: 0.97rem;
  color: var(--ink);
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.65rem 0.8rem;
  width: 100%;
}

.field textarea {
  min-height: 9rem;
  resize: vertical;
}

.form button {
  font: inherit;
  font-weight: 600;
  justify-self: start;
  padding: 0.7rem 1.6rem;
  border-radius: 999px;
  border: none;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}

.form button[disabled] {
  opacity: 0.55;
  cursor: progress;
}

.form-status {
  font-size: 0.94rem;
  min-height: 1.5rem;
}

.form-status[data-state='error'] {
  color: #c0392b;
}

.form-status[data-state='ok'] {
  color: var(--accent);
}

/* --- footer --- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 3rem 0 4rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  margin-bottom: 2.5rem;
}

.footer-grid h2 {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 0.75rem;
}

.footer-grid ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}

.footer-grid a {
  color: var(--ink-soft);
  text-decoration: none;
}

.footer-grid a:hover {
  color: var(--ink);
  text-decoration: underline;
}

.footer-note {
  border-top: 1px solid var(--line);
  padding-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  justify-content: space-between;
  color: var(--ink-faint);
  font-size: 0.84rem;
}

.disclaimer {
  max-width: 46ch;
}