*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --washi: #FBF7F0;
  --washi-2: #F3ECE0;
  --paper: #FFFFFF;
  --sumi: #1F1A17;
  --sumi-2: #3A332E;
  --text: #4D453E;
  --slate: #7A7066;
  --muted: #A89C8E;
  --line: #E7DECF;
  --line-2: #D8CCB8;
  --vermilion: #D7402B;
  --vermilion-deep: #B22F1E;
  --vermilion-soft: #FBEAE5;
  --indigo: #2A4B7C;
  --indigo-soft: #E9EEF5;
  --gold: #B8893B;
  --green: #4E8C57;
  --radius: 14px;
  --radius-sm: 9px;
  --maxw: 1120px;
  --fd: 'Shippori Mincho', Georgia, serif;
  --fb: 'Inter', system-ui, -apple-system, sans-serif;
}

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: var(--fb); background: var(--washi); color: var(--text); line-height: 1.7; font-size: 16px; -webkit-font-smoothing: antialiased; }
img, svg { display: block; max-width: 100%; }
a { color: var(--vermilion-deep); }
ul { list-style: none; }

.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 8px; top: 8px; background: var(--vermilion); color: #fff; padding: 8px 14px; border-radius: 8px; z-index: 200; }

.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 22px; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 100; background: rgba(251,247,240,0.9); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.header-bar { display: flex; align-items: center; justify-content: space-between; gap: 18px; min-height: 62px; }
.brand { display: flex; align-items: center; gap: 11px; font-family: var(--fd); font-weight: 700; font-size: 19px; color: var(--sumi); text-decoration: none; }
.brand-mark { width: 34px; height: 34px; border-radius: 9px; background: var(--vermilion); display: grid; place-items: center; color: #fff; font-family: var(--fd); font-weight: 700; font-size: 17px; flex-shrink: 0; }
.brand .jp { color: var(--vermilion); font-size: 13px; margin-left: 2px; }
.nav-inline { display: flex; gap: 4px; }
.nav-inline a { color: var(--slate); font-size: 14px; font-weight: 500; padding: 8px 12px; border-radius: 7px; text-decoration: none; }
.nav-inline a:hover { color: var(--sumi); background: var(--washi-2); }
@media (max-width: 680px) { .nav-inline { display: none; } }

/* Hero */
.hero { position: relative; overflow: hidden; padding-block: 70px 56px; text-align: center; }
.hero::before { content: "日本語"; position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%); font-family: var(--fd); font-weight: 700; font-size: clamp(140px, 30vw, 360px); color: var(--vermilion); opacity: .04; pointer-events: none; white-space: nowrap; }
.hero-inner { position: relative; max-width: 720px; margin-inline: auto; }
.pill { display: inline-flex; align-items: center; gap: 8px; background: var(--paper); border: 1px solid var(--line-2); border-radius: 999px; padding: 6px 15px; font-size: 13px; color: var(--slate); margin-bottom: 22px; }
.pill .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--vermilion); }
.hero h1 { font-family: var(--fd); font-size: clamp(30px, 5.2vw, 50px); font-weight: 700; line-height: 1.18; letter-spacing: -0.01em; color: var(--sumi); margin-bottom: 16px; }
.hero h1 .red { color: var(--vermilion); }
.hero p { font-size: clamp(16px, 2.2vw, 19px); color: var(--slate); max-width: 56ch; margin: 0 auto 26px; }
.hero-meta { display: flex; gap: 10px 22px; justify-content: center; flex-wrap: wrap; font-size: 13px; color: var(--muted); }
.hero-meta b { color: var(--vermilion-deep); }

/* Section */
.section { padding-block: 50px; }
.section + .section { padding-top: 0; }
.section-head { margin-bottom: 26px; display: flex; align-items: center; gap: 14px; }
.section-head .kanji { font-family: var(--fd); font-size: 30px; color: var(--vermilion); line-height: 1; }
.section-head h2 { font-family: var(--fd); font-size: clamp(22px, 3.4vw, 29px); font-weight: 700; color: var(--sumi); letter-spacing: -0.01em; }
.section-head p { font-size: 14px; color: var(--slate); margin-top: 2px; }

/* Card grid */
.grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 600px) { .grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 940px) { .grid { grid-template-columns: repeat(3, 1fr); } }
.card { display: flex; flex-direction: column; background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; transition: transform .18s, box-shadow .18s, border-color .18s; }
.card:hover { transform: translateY(-4px); box-shadow: 0 16px 36px rgba(31,26,23,.08); border-color: var(--line-2); }
.card-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; margin-bottom: 12px; }
.card h3 { font-family: var(--fd); font-size: 19px; font-weight: 700; color: var(--sumi); line-height: 1.25; }
.badge { font-size: 11px; font-weight: 600; padding: 4px 9px; border-radius: 6px; white-space: nowrap; }
.b-gratis { background: rgba(78,140,87,.14); color: var(--green); }
.b-freemium { background: var(--indigo-soft); color: var(--indigo); }
.b-bayar { background: var(--vermilion-soft); color: var(--vermilion-deep); }
.card .lvl { font-size: 12px; color: var(--muted); margin-bottom: 8px; }
.card p { font-size: 14px; color: var(--text); line-height: 1.6; flex: 1; margin-bottom: 16px; }
.card .go { display: inline-flex; align-items: center; gap: 7px; align-self: flex-start; font-family: var(--fb); font-weight: 600; font-size: 13.5px; color: var(--vermilion-deep); text-decoration: none; padding: 9px 16px; border: 1px solid var(--line-2); border-radius: 8px; transition: background .15s, border-color .15s, color .15s; }
.card .go:hover { background: var(--vermilion); color: #fff; border-color: var(--vermilion); }

/* Tips */
.tips { background: var(--washi-2); border: 1px solid var(--line); border-radius: 18px; padding: 36px 30px; }
.tips-grid { display: grid; grid-template-columns: 1fr; gap: 20px; }
@media (min-width: 720px) { .tips-grid { grid-template-columns: repeat(3, 1fr); } }
.tip .n { font-family: var(--fd); font-size: 22px; color: var(--vermilion); font-weight: 700; }
.tip h4 { font-family: var(--fd); font-size: 17px; font-weight: 700; color: var(--sumi); margin: 6px 0 5px; }
.tip p { font-size: 14px; color: var(--slate); line-height: 1.6; }

/* FAQ */
.faq { max-width: 800px; margin-inline: auto; }
.faq details { background: var(--paper); border: 1px solid var(--line); border-radius: 12px; margin-bottom: 12px; }
.faq summary { cursor: pointer; padding: 18px 22px; font-family: var(--fd); font-weight: 700; font-size: 16px; color: var(--sumi); list-style: none; display: flex; justify-content: space-between; gap: 14px; align-items: center; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--vermilion); font-size: 22px; transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq .faq-a { padding: 0 22px 18px; color: var(--slate); font-size: 14.5px; line-height: 1.7; }

.note { text-align: center; color: var(--muted); font-size: 13px; margin-top: 22px; max-width: 64ch; margin-inline: auto; line-height: 1.6; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); background: var(--washi-2); padding-block: 40px 28px; margin-top: 50px; text-align: center; }
.site-footer .brand { justify-content: center; margin-bottom: 12px; }
.site-footer p { font-size: 13px; color: var(--muted); max-width: 56ch; margin: 0 auto; line-height: 1.6; }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }