:root {
  --color-bg: #f3ecdd;
  --color-surface: #fffaf0;
  --color-surface-alt: #e7f4ef;
  --color-text: #1d241f;
  --color-muted: #667064;
  --color-primary: #2f6f5e;
  --color-primary-dark: #174738;
  --color-secondary: #d96f32;
  --color-accent: #f5c84c;
  --color-border: #d7cbb4;
  --font-heading: Georgia, 'Times New Roman', serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  --radius-sm: 8px;
  --radius-md: 18px;
  --radius-lg: 32px;
  --shadow-soft: 0 18px 48px rgba(35, 40, 31, 0.13);
  --shadow-line: 0 1px 0 rgba(29, 36, 31, 0.08);
  --ink: #27352f;
  --paper-line: rgba(47, 111, 94, .16);
  --token-bg: #fbf0cc;
  --danger-soft: #f7d9cf;
  --success-soft: #d8ead9;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.65;
  background:
    linear-gradient(90deg, rgba(47,111,94,.08) 1px, transparent 1px) 0 0/42px 42px,
    linear-gradient(0deg, rgba(47,111,94,.055) 1px, transparent 1px) 0 0/42px 42px,
    radial-gradient(circle at 12% 4%, rgba(245,200,76,.32), transparent 28rem),
    var(--color-bg);
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .5;
  background-image:
    repeating-linear-gradient(0deg, transparent 0 8px, rgba(29,36,31,.025) 9px 10px);
  mix-blend-mode: multiply;
  z-index: -1;
}
a { color: var(--color-primary-dark); text-decoration-thickness: .08em; text-underline-offset: .22em; }
a:hover { color: var(--color-secondary); }
img { max-width: 100%; height: auto; display: block; }

.container { width: min(1160px, calc(100% - 32px)); margin: 0 auto; }
.skip-link {
  position: absolute; left: 12px; top: -44px; z-index: 20; padding: 10px 14px;
  background: var(--color-primary-dark); color: white; border-radius: var(--radius-sm);
}
.skip-link:focus { top: 12px; }
.site-header {
  position: sticky; top: 0; z-index: 10; border-bottom: 1px solid rgba(29,36,31,.1);
  background: rgba(243, 236, 221, .92); backdrop-filter: blur(14px);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 76px; }
.logo { display: inline-flex; align-items: center; gap: 11px; font-weight: 850; letter-spacing: -.02em; text-decoration: none; color: var(--color-text); }
.logo img { width: 42px; height: 42px; }
.logo span { display: grid; line-height: 1.05; }
.logo small { color: var(--color-muted); font-size: .72rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.main-nav { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.main-nav a {
  text-decoration: none; color: var(--color-text); font-size: .95rem; font-weight: 720;
  padding: 9px 12px; border: 1px solid transparent; border-radius: 999px;
}
.main-nav a:hover, .main-nav a[aria-current="page"] { border-color: var(--color-border); background: rgba(255,250,240,.72); color: var(--color-primary-dark); }
.nav-cta { background: var(--color-primary-dark) !important; color: #fff !important; border-color: var(--color-primary-dark) !important; }

main { overflow: hidden; }
.section { padding: 78px 0; }
.section.compact { padding: 52px 0; }
.section-title { font-family: var(--font-heading); font-size: clamp(2rem, 5vw, 3.8rem); line-height: .98; letter-spacing: -.045em; margin: 0 0 18px; }
.section-kicker { margin: 0 0 12px; color: var(--color-secondary); text-transform: uppercase; letter-spacing: .14em; font-weight: 850; font-size: .78rem; }
.lead { font-size: clamp(1.05rem, 2.2vw, 1.32rem); color: #3e463f; max-width: 780px; }
.muted { color: var(--color-muted); }
.two-col { display: grid; grid-template-columns: minmax(0, 1fr) minmax(320px, .82fr); gap: 34px; align-items: start; }
.three-col { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 18px; }
.four-col { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 16px; }
.grid-gap { gap: 24px; }

.hero { padding: 58px 0 70px; }
.hero-lab { display: grid; grid-template-columns: minmax(0, .92fr) minmax(360px, 1.08fr); gap: 32px; align-items: center; }
.hero-copy { position: relative; }
.hero h1, .page-hero h1 {
  font-family: var(--font-heading); font-size: clamp(3rem, 9vw, 7.5rem); line-height: .88; letter-spacing: -.07em; margin: 0;
}
.hero h1 span { color: var(--color-primary-dark); }
.hero-note {
  margin-top: 24px; max-width: 630px; padding-left: 18px; border-left: 6px solid var(--color-accent);
  font-size: 1.14rem; color: #38423a;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 46px; padding: 12px 18px;
  border-radius: 999px; border: 2px solid var(--color-primary-dark); background: var(--color-primary-dark); color: #fff;
  font-weight: 830; text-decoration: none; box-shadow: 0 9px 0 rgba(23,71,56,.13); transform: translateY(0); transition: .18s ease;
}
.btn:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 12px 0 rgba(23,71,56,.16); }
.btn.secondary { background: var(--color-surface); color: var(--color-primary-dark); border-color: var(--color-border); box-shadow: none; }
.btn.secondary:hover { color: var(--color-secondary); transform: translateY(-1px); }
.btn.ghost { background: transparent; color: var(--color-primary-dark); border-color: transparent; box-shadow: none; }

.lab-board {
  position: relative; padding: 26px; border: 1px solid var(--color-border); border-radius: 34px;
  background: linear-gradient(135deg, rgba(255,250,240,.95), rgba(231,244,239,.92)); box-shadow: var(--shadow-soft);
}
.lab-board::before {
  content: "AI ↔ EN"; position: absolute; top: -14px; left: 28px; padding: 4px 12px;
  border-radius: 999px; background: var(--color-secondary); color: #fff; font-weight: 900; letter-spacing: .08em; font-size: .76rem;
}
.copybook-page {
  min-height: 420px; border-radius: 24px; padding: 26px; border: 1px solid rgba(29,36,31,.1);
  background:
    linear-gradient(90deg, rgba(217,111,50,.23) 0 2px, transparent 2px 100%) 42px 0/100% 100%,
    repeating-linear-gradient(0deg, transparent 0 31px, var(--paper-line) 32px 33px),
    var(--color-surface);
  position: relative; overflow: hidden;
}
.copybook-page::after {
  content: ""; position: absolute; right: -24px; bottom: -28px; width: 190px; height: 190px; border-radius: 50%;
  border: 28px solid rgba(47,111,94,.08);
}
.phrase-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 22px 58px; }
.phrase-token {
  display: inline-flex; align-items: center; min-height: 34px; padding: 4px 11px; border-radius: 999px;
  background: var(--token-bg); border: 1px solid #e3c76f; font-weight: 850; box-shadow: var(--shadow-line);
}
.ai-comment { margin-left: 58px; max-width: 380px; padding: 15px 16px; border-left: 6px solid var(--color-primary); border-radius: 0 16px 16px 0; background: rgba(231,244,239,.82); }
.score-strip { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; margin: 28px 0 0 58px; }
.score-strip div { padding: 12px; border: 1px dashed rgba(29,36,31,.25); border-radius: 16px; background: rgba(255,250,240,.74); }
.score-strip strong { display: block; font-family: var(--font-heading); font-size: 1.8rem; line-height: 1; }

.card {
  position: relative; border: 1px solid var(--color-border); background: rgba(255,250,240,.76); border-radius: var(--radius-md); padding: 22px; box-shadow: var(--shadow-line);
}
.card.paper { background: var(--color-surface); }
.card.pin::before {
  content: ""; position: absolute; width: 18px; height: 18px; top: 14px; right: 16px; border-radius: 50%;
  background: radial-gradient(circle, #fff 0 25%, var(--color-accent) 27% 100%); box-shadow: 0 4px 0 rgba(29,36,31,.1);
}
.card h2, .card h3 { margin-top: 0; line-height: 1.12; }
.card h3 { font-family: var(--font-heading); font-size: 1.45rem; letter-spacing: -.03em; }
.card:hover { transform: translateY(-2px); transition: transform .18s ease; }

.copybook-panel {
  border-radius: var(--radius-lg); border: 1px solid var(--color-border); background:
    repeating-linear-gradient(0deg, transparent 0 35px, rgba(47,111,94,.12) 36px 37px),
    linear-gradient(90deg, rgba(217,111,50,.20) 0 2px, transparent 2px 100%) 56px 0/100% 100%,
    var(--color-surface);
  padding: 28px 30px 28px 82px; box-shadow: var(--shadow-soft); position: relative;
}
.copybook-panel::before {
  content: ""; position: absolute; inset: 20px auto 20px 28px; width: 18px; border-radius: 999px;
  background: radial-gradient(circle at center, rgba(29,36,31,.23) 0 3px, transparent 4px) 0 0/18px 34px;
}
.token-chain { display: flex; flex-wrap: wrap; gap: 12px; padding: 14px 0; list-style: none; margin: 0; }
.token-chain li {
  position: relative; padding: 8px 13px; border: 1px solid #dfc979; background: #fff3c7; border-radius: 999px; font-weight: 820;
}
.token-chain li:not(:last-child)::after { content: "→"; margin-left: 12px; color: var(--color-primary); }
.error-map {
  display: grid; gap: 10px; border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 16px; background: #fffaf0;
}
.error-line { display: grid; grid-template-columns: 100px 1fr; gap: 12px; align-items: center; }
.error-line span:first-child { color: var(--color-muted); font-size: .9rem; }
.heat { height: 14px; border-radius: 999px; background: linear-gradient(90deg, var(--success-soft), var(--color-accent), var(--danger-soft)); border: 1px solid rgba(29,36,31,.08); }
.heat.short { width: 44%; } .heat.mid { width: 68%; } .heat.long { width: 92%; }
.pronunciation-wave {
  display: flex; align-items: end; gap: 5px; min-height: 88px; padding: 17px; border: 1px solid var(--color-border);
  border-radius: var(--radius-md); background: linear-gradient(180deg, rgba(231,244,239,.9), rgba(255,250,240,.9));
}
.pronunciation-wave i { width: 9%; border-radius: 999px 999px 3px 3px; background: var(--color-primary); opacity: .84; transform-origin: bottom; animation: pulseWave 2.4s ease-in-out infinite; }
.pronunciation-wave i:nth-child(2n) { background: var(--color-secondary); animation-delay: .16s; }
.pronunciation-wave i:nth-child(3n) { background: var(--color-accent); animation-delay: .28s; }
@keyframes pulseWave { 0%,100%{ transform: scaleY(.74);} 50%{ transform: scaleY(1.08);} }
.lesson-path { position: relative; display: grid; gap: 16px; counter-reset: path; }
.lesson-path::before { content: ""; position: absolute; left: 22px; top: 20px; bottom: 20px; border-left: 2px dashed rgba(47,111,94,.38); }
.path-step { position: relative; counter-increment: path; display: grid; grid-template-columns: 48px 1fr; gap: 16px; align-items: start; }
.path-step::before {
  content: counter(path); width: 46px; height: 46px; display: grid; place-items: center; border-radius: 50%;
  background: var(--color-primary-dark); color: #fff; font-weight: 900; box-shadow: 0 0 0 8px var(--color-bg); z-index: 1;
}
.path-step div { padding: 16px; border: 1px solid var(--color-border); border-radius: var(--radius-md); background: rgba(255,250,240,.82); }
.path-step h3 { margin: 0 0 6px; font-family: var(--font-heading); font-size: 1.35rem; }
.prompt-card {
  border-radius: 0 var(--radius-lg) var(--radius-lg) var(--radius-lg); border: 1px solid var(--color-border); background: #1d241f; color: #f8edd9;
  padding: 22px; box-shadow: var(--shadow-soft); position: relative;
}
.prompt-card::before { content: "prompt"; position: absolute; top: -16px; left: 0; background: var(--color-accent); color: var(--color-text); padding: 3px 11px; border-radius: 999px; font-size: .75rem; font-weight: 900; letter-spacing: .12em; text-transform: uppercase; }
.prompt-card code { color: #ffe58e; white-space: normal; }

.page-hero { padding: 54px 0 48px; }
.page-hero .lead { max-width: 850px; }
.breadcrumbs { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; color: var(--color-muted); font-size: .92rem; margin-bottom: 26px; }
.breadcrumbs a { color: var(--color-muted); text-decoration: none; }
.breadcrumbs span::before { content: "/"; margin-right: 8px; color: var(--color-border); }
.page-mark {
  display: inline-flex; align-items: center; gap: 9px; padding: 7px 12px; margin-bottom: 18px; border-radius: 999px;
  background: rgba(255,250,240,.85); border: 1px solid var(--color-border); font-size: .9rem; font-weight: 850;
}
.editorial { max-width: 820px; }
.editorial p { font-size: 1.05rem; }
.editorial h2 { font-family: var(--font-heading); font-size: clamp(1.8rem, 4vw, 3rem); letter-spacing: -.04em; line-height: 1; margin: 48px 0 16px; }
.editorial h3 { margin-top: 28px; }
.side-note { border-left: 6px solid var(--color-secondary); background: rgba(255,250,240,.8); border-radius: 0 18px 18px 0; padding: 18px; }
.check-list { padding-left: 0; list-style: none; display: grid; gap: 10px; }
.check-list li { padding-left: 34px; position: relative; }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 0; width: 24px; height: 24px; border-radius: 50%; background: var(--success-soft); display: grid; place-items: center; color: var(--color-primary-dark); font-weight: 900; }
.warning-list li::before { content: "!"; background: var(--danger-soft); color: #8a351f; }
.compare-table { width: 100%; border-collapse: collapse; overflow: hidden; border-radius: var(--radius-md); background: var(--color-surface); box-shadow: var(--shadow-line); }
.compare-table th, .compare-table td { padding: 15px 16px; border-bottom: 1px solid var(--color-border); text-align: left; vertical-align: top; }
.compare-table th { background: rgba(47,111,94,.1); font-size: .9rem; text-transform: uppercase; letter-spacing: .08em; }
.compare-table tr:last-child td { border-bottom: 0; }
.scenario-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 18px; }
.scenario-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: 28px; padding: 24px; position: relative; overflow: hidden; }
.scenario-card::after { content: attr(data-label); position: absolute; right: 18px; top: 14px; color: rgba(29,36,31,.12); font-family: var(--font-heading); font-size: 4rem; line-height: 1; }
.service-strip { display: grid; grid-template-columns: .9fr 1.1fr; gap: 20px; align-items: stretch; }
.service-stamp { border: 2px dashed rgba(47,111,94,.42); border-radius: var(--radius-lg); padding: 24px; background: rgba(231,244,239,.68); }
.service-stamp strong { display: block; font-family: var(--font-heading); font-size: 2.8rem; line-height: .9; color: var(--color-primary-dark); }
.mini-form {
  display: grid; gap: 12px; max-width: 600px; border-radius: var(--radius-lg); padding: 24px; border: 1px solid var(--color-border);
  background: linear-gradient(135deg, var(--color-surface), rgba(231,244,239,.75)); box-shadow: var(--shadow-soft);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
label { font-weight: 800; }
input, select, textarea {
  width: 100%; border: 1px solid var(--color-border); border-radius: 15px; padding: 12px 13px; background: #fffdfa; color: var(--color-text); font: inherit;
}
textarea { min-height: 116px; resize: vertical; }
input:focus-visible, select:focus-visible, textarea:focus-visible, .btn:focus-visible, a:focus-visible {
  outline: 3px solid var(--color-accent); outline-offset: 3px;
}
.faq-list { display: grid; gap: 14px; }
details { border: 1px solid var(--color-border); border-radius: 22px; background: rgba(255,250,240,.88); padding: 0; overflow: hidden; }
summary { cursor: pointer; padding: 18px 22px; font-weight: 850; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; float: right; color: var(--color-secondary); font-weight: 900; }
details[open] summary::after { content: "−"; }
details p { padding: 0 22px 20px; margin: 0; color: #3c453e; }
.footer { padding: 46px 0; background: #17221d; color: #f8edd9; }
.footer a { color: #ffe391; }
.footer-grid { display: grid; grid-template-columns: 1.2fr .8fr .8fr; gap: 26px; }
.footer .logo { color: #f8edd9; }
.footer .logo small { color: #d9cfbd; }
.footer-nav { display: grid; gap: 8px; }
.badge-line { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.badge { display: inline-flex; align-items: center; gap: 6px; border: 1px solid rgba(255,255,255,.18); padding: 5px 10px; border-radius: 999px; font-size: .88rem; color: #f8edd9; }

@media (max-width: 940px) {
  .header-inner { align-items: flex-start; flex-direction: column; padding: 14px 0; }
  .main-nav { width: 100%; }
  .hero-lab, .two-col, .service-strip { grid-template-columns: 1fr; }
  .three-col, .four-col, .scenario-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .hero h1, .page-hero h1 { font-size: clamp(3rem, 14vw, 6rem); }
}
@media (max-width: 640px) {
  .container { width: min(100% - 22px, 1160px); }
  .section { padding: 54px 0; }
  .hero { padding-top: 34px; }
  .three-col, .four-col, .scenario-grid, .form-row { grid-template-columns: 1fr; }
  .main-nav a { padding: 8px 10px; font-size: .9rem; }
  .copybook-page { padding: 20px 14px; min-height: 370px; }
  .phrase-row, .ai-comment, .score-strip { margin-left: 24px; }
  .score-strip { grid-template-columns: 1fr; }
  .copybook-panel { padding: 24px 18px 24px 54px; }
  .compare-table { display: block; overflow-x: auto; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}
.pronunciation-wave i:nth-child(1) { height: 42px; }
.pronunciation-wave i:nth-child(2) { height: 78px; }
.pronunciation-wave i:nth-child(3) { height: 112px; }
.pronunciation-wave i:nth-child(4) { height: 58px; }
.pronunciation-wave i:nth-child(5) { height: 128px; }
.pronunciation-wave i:nth-child(6) { height: 64px; }
.pronunciation-wave i:nth-child(7) { height: 92px; }
.pronunciation-wave i:nth-child(8) { height: 52px; }