/* 一杯 (Ippai) — ippai.stack-works.dev
   Palette: warm latte neutrals + AccentBrown (#8C5A3C). */

:root {
  --brand: #8C5A3C;          /* AccentBrown — fills */
  --brand-dark: #6E432B;
  --brand-ink: #7A4A2E;      /* accent used as text/links (flips in dark) */
  --bg: #FBF6F0;
  --bg-2: #F3E9DE;
  --surface: #FFFFFF;
  --text: #2A211B;
  --muted: #6B5D52;
  --line: rgba(42, 33, 27, 0.12);
  --ring: rgba(140, 90, 60, 0.16);
  --shadow: 0 18px 40px -28px rgba(58, 38, 24, 0.55);
}

@media (prefers-color-scheme: dark) {
  :root {
    --brand: #A56B45;
    --brand-dark: #7E4F32;
    --brand-ink: #E3B189;
    --bg: #16110D;
    --bg-2: #1E1712;
    --surface: #221A15;
    --text: #F3EAE1;
    --muted: #B0A197;
    --line: rgba(243, 234, 225, 0.14);
    --ring: rgba(227, 177, 137, 0.16);
    --shadow: 0 18px 40px -28px rgba(0, 0, 0, 0.8);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
html, body { margin: 0; padding: 0; }

body {
  font-family: ui-sans-serif, system-ui, -apple-system, "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--brand-ink); }

.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.row { display: flex; gap: 16px; align-items: center; justify-content: space-between; flex-wrap: wrap; min-height: 64px; }

/* ---------- header ---------- */
header.nav {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: saturate(160%) blur(10px);
  background: var(--bg); /* fallback for browsers without color-mix() */
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--line);
}
.logo { display: flex; gap: 10px; align-items: center; text-decoration: none; color: var(--text); }
.logo img { width: 32px; height: 32px; border-radius: 8px; }
.logo span { font-weight: 700; letter-spacing: .04em; }
.nav-actions { display: flex; gap: 4px; flex-wrap: wrap; }
.nav-actions a { color: var(--text); text-decoration: none; padding: 8px 10px; border-radius: 8px; font-size: 15px; }
.nav-actions a:hover { background: var(--bg-2); }

/* ---------- hero ---------- */
.hero { padding: 56px 0 40px; background: linear-gradient(180deg, var(--bg-2), var(--bg)); }
.hero .grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 40px; align-items: center; }
.hero-icon { width: 88px; height: 88px; border-radius: 20px; box-shadow: var(--shadow); margin-bottom: 20px; }
.title { font-size: clamp(32px, 7vw, 52px); line-height: 1.2; margin: 0 0 4px; letter-spacing: .06em; }
.subtitle { font-size: clamp(15px, 3.4vw, 18px); color: var(--brand-ink); font-weight: 600; margin: 0 0 16px; }
.lead { font-size: clamp(15px, 3.2vw, 17px); color: var(--muted); margin: 0 0 24px; }
.shot { border-radius: 22px; border: 1px solid var(--line); box-shadow: var(--shadow); margin: 0 auto; max-width: 300px; }

.badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; padding: 6px 12px; border-radius: 999px;
  background: var(--ring); color: var(--brand-ink);
  border: 1px solid var(--line); margin-bottom: 16px;
}

/* ---------- buttons / store badge ---------- */
.cta { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.btn {
  display: inline-block; border: 0; cursor: pointer; text-decoration: none;
  border-radius: 12px; padding: 13px 20px; font-weight: 600;
}
.btn.primary { background: var(--brand); color: #fff; box-shadow: 0 12px 24px -14px var(--brand-dark); }
.btn.primary:hover { background: var(--brand-dark); }
.btn.secondary { background: var(--surface); color: var(--text); border: 1px solid var(--line); }

.store-badge {
  display: inline-flex; flex-direction: column; gap: 2px;
  padding: 12px 22px; border-radius: 12px;
  border: 2px dashed var(--brand); color: var(--brand-ink);
  background: var(--surface); font-weight: 700; text-align: left;
}
.store-badge small { display: block; font-weight: 500; font-size: 12px; color: var(--muted); }
.note { font-size: 13px; color: var(--muted); margin-top: 12px; }

/* ---------- sections ---------- */
.section { padding: 56px 0; scroll-margin-top: 72px; }
.section.alt { background: var(--bg-2); }
.section h2 { font-size: clamp(21px, 4.6vw, 28px); margin: 0 0 8px; letter-spacing: .03em; }
.section p.desc { color: var(--muted); margin: 0 0 28px; }

.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card {
  border: 1px solid var(--line); border-radius: 16px; padding: 20px;
  background: var(--surface); box-shadow: var(--shadow);
}
.card h3 { margin: 8px 0 8px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.emoji { font-size: 24px; line-height: 1; }

.shots { display: flex; gap: 20px; flex-wrap: wrap; justify-content: center; }
.shots figure { margin: 0; max-width: 260px; }
.shots figcaption { color: var(--muted); font-size: 14px; text-align: center; margin-top: 12px; }

/* ---------- faq ---------- */
.faq { display: grid; gap: 12px; }
.faq details {
  border: 1px solid var(--line); border-radius: 14px;
  background: var(--surface); padding: 4px 18px;
}
.faq summary {
  cursor: pointer; font-weight: 700; padding: 14px 0; list-style: none;
  display: flex; justify-content: space-between; gap: 12px; align-items: center;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "＋"; color: var(--brand-ink); font-weight: 700; flex: none; }
.faq details[open] summary::after { content: "－"; }
.faq details p { margin: 0 0 16px; color: var(--muted); font-size: 15px; }
.faq details p:last-child { margin-bottom: 16px; }

/* ---------- contact ---------- */
.contact-box {
  border: 1px solid var(--line); border-radius: 16px; background: var(--surface);
  padding: 24px; box-shadow: var(--shadow);
}
.contact-box p { color: var(--muted); margin: 0 0 12px; }
.contact-box a.mail { font-size: clamp(17px, 4vw, 21px); font-weight: 700; word-break: break-all; }
.contact-box ul { color: var(--muted); margin: 12px 0 0; padding-left: 20px; font-size: 15px; }

/* ---------- footer ---------- */
footer { padding: 28px 0 40px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer .links { display: flex; gap: 16px; flex-wrap: wrap; }
footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--brand-ink); text-decoration: underline; }

/* ---------- legal pages ---------- */
.content { max-width: 760px; margin: 0 auto; padding: 40px 20px 64px; }
.content h1 { font-size: clamp(24px, 5.5vw, 32px); margin: 0 0 8px; }
.content .update-date { color: var(--muted); margin: 0 0 32px; font-size: 14px; }
.content h2 { font-size: clamp(17px, 3.8vw, 20px); margin: 36px 0 10px; color: var(--brand-ink); }
.content p, .content ul { line-height: 1.9; margin: 0 0 14px; }
.content ul { padding-left: 24px; }
.content li { margin-bottom: 6px; }
.back-link { display: inline-block; margin: 8px 0 24px; color: var(--brand-ink); text-decoration: none; }
.back-link:hover { text-decoration: underline; }

/* ---------- 404 ---------- */
.error-container { max-width: 560px; margin: 0 auto; padding: 96px 20px; text-align: center; }
.error-emoji { font-size: 56px; }
.error-code { font-size: 60px; margin: 8px 0 0; letter-spacing: -1px; }
.error-title { font-size: 20px; margin: 8px 0 16px; }
.error-message { color: var(--muted); margin-bottom: 28px; }

/* ---------- responsive ---------- */
@media (max-width: 880px) {
  .hero { padding: 40px 0 32px; }
  .hero .grid { grid-template-columns: 1fr; gap: 32px; }
  .features { grid-template-columns: 1fr; }
  .shot { max-width: 260px; }
  .row { min-height: 56px; }
  .nav-actions a { padding: 8px; font-size: 14px; }
}

@media (max-width: 480px) {
  header.nav .row { flex-wrap: nowrap; gap: 6px; }
  header.nav .logo { flex: 0 0 auto; }
  header.nav .logo span { white-space: nowrap; }
  .nav-actions { gap: 0; flex-wrap: nowrap; min-width: 0; overflow-x: auto; scrollbar-width: none; }
  .nav-actions::-webkit-scrollbar { display: none; }
  .nav-actions a { padding: 8px 5px; font-size: 13px; white-space: nowrap; }
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

:focus-visible { outline: 3px solid var(--brand-ink); outline-offset: 2px; border-radius: 6px; }