:root {
  --ink: #18332f;
  --ink-soft: #38534e;
  --paper: #f7f2e7;
  --paper-deep: #eee5d3;
  --white: #fffdf8;
  --green: #1d6b57;
  --green-bright: #2c8b6f;
  --mint: #cfe7dc;
  --coral: #e86e52;
  --yellow: #f1c75b;
  --purple: #7764a8;
  --line: rgba(24, 51, 47, 0.18);
  --shadow: 0 18px 48px rgba(35, 45, 40, 0.12);
  --radius: 18px;
  --sidebar: 280px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Pretendard", "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  overflow-wrap: break-word;
}
button, input, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
img { max-width: 100%; }
pre, code { font-family: "D2Coding", "Cascadia Code", "SFMono-Regular", Consolas, monospace; }

.skip-link {
  position: fixed; left: 16px; top: -80px; z-index: 1000;
  padding: 10px 16px; color: white; background: var(--ink); border-radius: 8px;
}
.skip-link:focus { top: 12px; }

.reading-progress { position: fixed; inset: 0 0 auto; height: 4px; background: transparent; z-index: 999; }
.reading-progress span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--coral), var(--yellow)); }

.topbar {
  height: 72px; padding: 0 clamp(20px, 5vw, 72px); display: flex; align-items: center; justify-content: space-between;
  background: rgba(247, 242, 231, 0.92); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 50;
}
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 800; letter-spacing: -0.02em; }
.brand img { width: 58px; height: 34px; object-fit: contain; }
.top-actions { display: flex; gap: 14px; align-items: center; }
.hub-back-link { display: inline-flex; align-items: center; gap: 6px; min-height: 38px; padding: 7px 12px; color: var(--ink); background: var(--white); border: 1px solid var(--ink); border-radius: 9px; font-size: .82rem; font-weight: 850; text-decoration: none; transition: transform .18s ease, box-shadow .18s ease; }
.hub-back-link:hover { transform: translateY(-2px); box-shadow: 3px 3px 0 var(--yellow); }
.hub-back-link:focus-visible, .footer-back-link:focus-visible { outline: 3px solid var(--yellow); outline-offset: 3px; }
.verified-date { font-size: 0.82rem; color: var(--ink-soft); padding: 5px 10px; border: 1px solid var(--line); border-radius: 999px; }
.icon-button, .menu-toggle {
  cursor: pointer; border: 1px solid var(--ink); color: var(--ink); background: transparent;
  border-radius: 10px; padding: 8px 13px; font-weight: 750;
}
.icon-button:hover, .menu-toggle:hover { background: var(--ink); color: white; }

.hero {
  min-height: 620px; padding: 84px clamp(24px, 7vw, 112px); display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  align-items: center; gap: clamp(48px, 8vw, 110px); background:
    radial-gradient(circle at 8% 15%, rgba(241,199,91,.28), transparent 22%),
    radial-gradient(circle at 82% 83%, rgba(44,139,111,.18), transparent 24%),
    linear-gradient(135deg, #fbf7ee 0%, #f0e8d9 100%);
  border-bottom: 1px solid var(--line); overflow: hidden;
}
.eyebrow, .section-kicker { margin: 0 0 12px; color: var(--coral); text-transform: uppercase; font-size: 0.78rem; font-weight: 900; letter-spacing: 0.12em; }
.hero h1 { margin: 0; max-width: 760px; font-family: Georgia, "Noto Serif KR", serif; font-size: clamp(2.9rem, 6vw, 6rem); line-height: 1.08; letter-spacing: -0.055em; font-weight: 800; }
.hero h1 em { color: var(--green); font-style: normal; box-shadow: inset 0 -0.23em var(--yellow); }
.hero-lead { max-width: 680px; margin: 30px 0 0; font-size: clamp(1.05rem, 1.45vw, 1.25rem); line-height: 1.8; color: var(--ink-soft); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.primary-button, .secondary-button, .ghost-button {
  display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 10px 18px;
  border-radius: 10px; font-weight: 850; text-decoration: none; cursor: pointer; transition: transform .18s ease, box-shadow .18s ease;
}
.primary-button { background: var(--ink); color: white; border: 1px solid var(--ink); box-shadow: 4px 4px 0 var(--yellow); }
.secondary-button { color: var(--ink); background: var(--white); border: 1px solid var(--ink); }
.ghost-button { color: var(--ink); background: transparent; border: 1px solid rgba(255,255,255,.5); }
.primary-button:hover, .secondary-button:hover, .ghost-button:hover { transform: translateY(-2px); }
.hero-note { margin-top: 22px; font-size: 0.86rem; color: var(--ink-soft); }

.hero-board {
  position: relative; min-height: 410px; padding: 42px; display: flex; flex-direction: column; justify-content: center;
  color: #f7f2e7; background: var(--ink); border: 2px solid var(--ink); border-radius: 8px 34px 10px 28px;
  transform: rotate(1.1deg); box-shadow: 13px 16px 0 rgba(232,110,82,.75), var(--shadow);
}
.hero-board::before { content: ""; position: absolute; inset: 10px; border: 1px dashed rgba(255,255,255,.22); border-radius: 6px 28px 8px 22px; pointer-events: none; }
.board-label { margin: 0 0 22px; font-weight: 800; color: var(--yellow); letter-spacing: .08em; }
.board-formula { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin: 0; font-family: Georgia, serif; font-size: clamp(1.4rem, 2.2vw, 2.3rem); line-height: 1.55; }
.board-formula span { border-bottom: 3px solid var(--coral); }
.board-formula b { color: var(--yellow); }
.service-row { display: flex; flex-wrap: wrap; gap: 22px; margin-top: 46px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.2); }
.service-row div { display: flex; align-items: center; gap: 8px; font-size: .84rem; font-weight: 700; }
.service-row img { width: 28px; height: 28px; object-fit: contain; background: rgba(255,255,255,.95); border-radius: 8px; padding: 3px; }
.doodle { position: absolute; color: var(--yellow); font-size: 2.3rem; font-family: Georgia, serif; }
.doodle-one { right: 20px; top: 14px; }.doodle-two { right: 28px; bottom: 18px; transform: rotate(12deg); }

.mobile-tools { display: none; }
.layout { display: grid; grid-template-columns: var(--sidebar) minmax(0, 1fr); max-width: 1500px; margin: 0 auto; }
.sidebar { border-right: 1px solid var(--line); background: rgba(255,253,248,.5); }
.sidebar-inner { position: sticky; top: 72px; max-height: calc(100vh - 72px); overflow-y: auto; padding: 34px 24px; scrollbar-width: thin; }
.search-box span { display: block; font-size: .75rem; font-weight: 900; letter-spacing: .06em; margin-bottom: 6px; }
.search-box input { width: 100%; border: 1px solid var(--line); border-radius: 9px; background: white; color: var(--ink); padding: 10px 12px; outline: none; }
.search-box input:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(44,139,111,.14); }
.search-status { min-height: 1.2em; margin: 7px 0 0; font-size: .76rem; color: var(--green); }
.course-progress { padding: 15px; margin: 14px 0 20px; background: var(--mint); border-radius: 12px; }
.course-progress > div:first-child { display: flex; justify-content: space-between; font-size: .8rem; }
.course-progress strong { font-size: .95rem; }
.progress-track { height: 7px; margin-top: 9px; background: rgba(24,51,47,.15); border-radius: 999px; overflow: hidden; }
.progress-track span { display: block; width: 0; height: 100%; background: var(--green); transition: width .25s ease; }
.text-button { border: 0; padding: 5px 0 0; background: transparent; color: var(--ink-soft); text-decoration: underline; font-size: .72rem; cursor: pointer; }
.toc { display: grid; gap: 3px; }
.toc a { display: flex; gap: 10px; padding: 9px 8px; border-radius: 8px; text-decoration: none; font-size: .87rem; font-weight: 700; color: var(--ink-soft); }
.toc a span { color: var(--coral); font-family: Georgia, serif; font-size: .78rem; }
.toc a:hover, .toc a.active { color: var(--ink); background: var(--paper-deep); }
.sidebar-tip { margin-top: 28px; padding: 16px; border: 1px dashed var(--green); border-radius: 12px; background: var(--white); transform: rotate(-.5deg); }
.sidebar-tip strong { font-size: .84rem; }.sidebar-tip p { margin: 5px 0 0; font-size: .78rem; line-height: 1.65; }

main { min-width: 0; background: var(--white); }
.content-section { padding: 92px clamp(28px, 7vw, 108px); border-bottom: 1px solid var(--line); }
.content-section:nth-child(even):not(.builder-section):not(.diagnosis-section) { background: #fcfaf4; }
.section-heading { max-width: 820px; margin-bottom: 44px; }
.section-heading h2 { margin: 0; font-family: Georgia, "Noto Serif KR", serif; font-size: clamp(2rem, 4vw, 3.5rem); line-height: 1.22; letter-spacing: -0.045em; }
.section-heading > p:last-child { margin: 18px 0 0; color: var(--ink-soft); font-size: 1.04rem; }
.light-heading h2, .light-heading > p:last-child { color: white; }
.light-heading .section-kicker { color: var(--yellow); }

.quick-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.quick-card { position: relative; padding: 28px 24px; background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); }
.quick-card:nth-child(2) { transform: translateY(12px); }.quick-card:nth-child(3) { transform: translateY(24px); }
.step-number { display: inline-grid; place-items: center; width: 34px; height: 34px; color: white; background: var(--coral); border-radius: 50%; font-family: Georgia, serif; font-weight: 900; }
.quick-card h3 { margin: 17px 0 8px; font-size: 1.1rem; }.quick-card p { margin: 0; font-size: .92rem; color: var(--ink-soft); }
.prompt-card { position: relative; margin-top: 24px; padding: 20px; color: #eaf4ee; background: #18332f; border-radius: 14px; box-shadow: 5px 5px 0 rgba(241,199,91,.65); }
.featured-prompt { margin-top: 56px; }
.prompt-meta { display: flex; gap: 9px; align-items: center; margin-bottom: 12px; font-size: .76rem; color: #b8d1c8; }
.prompt-card pre { margin: 0; padding-right: 88px; white-space: pre-wrap; word-break: keep-all; font-size: .88rem; line-height: 1.72; }
.prompt-card code { color: inherit; }
.copy-button { cursor: pointer; border: 1px solid rgba(255,255,255,.4); color: white; background: rgba(255,255,255,.08); padding: 7px 11px; border-radius: 8px; font-size: .76rem; font-weight: 800; }
.prompt-card > .copy-button { position: absolute; right: 14px; top: 14px; }
.copy-button:hover { background: white; color: var(--ink); }
.copy-button.compact { color: var(--ink); border-color: var(--line); background: white; white-space: nowrap; }
.level { display: inline-block; padding: 3px 9px; border-radius: 999px; font-size: .7rem; font-weight: 900; }
.level.basic { color: #16523f; background: #cbe8d8; }.level.intermediate { color: #664f0b; background: #f5dda1; }.level.advanced { color: #583d81; background: #e1d7f7; }
.follow-up-strip { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 14px; margin-top: 20px; padding: 14px 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--paper); }
.follow-up-strip code { font-size: .82rem; color: var(--ink-soft); }
.callout { display: flex; gap: 15px; margin-top: 28px; padding: 20px; border-radius: 14px; }
.callout-icon { flex: 0 0 34px; height: 34px; display: grid; place-items: center; color: white; border-radius: 50%; font-weight: 900; }
.key-callout { background: #e5f1ea; }.key-callout .callout-icon { background: var(--green); }
.caution-callout { background: #fff1d2; }.caution-callout .callout-icon { background: #a56c10; }
.callout strong { display: block; margin-bottom: 2px; }.callout p { margin: 0; font-size: .9rem; }

.formula-table { border-top: 2px solid var(--ink); }
.formula-table article { display: grid; grid-template-columns: 70px minmax(0, 1fr); gap: 20px; padding: 24px 10px; border-bottom: 1px solid var(--line); }
.formula-index { font-family: Georgia, serif; color: var(--coral); font-size: 1.6rem; font-weight: 900; }
.formula-table h3 { margin: 0 0 4px; }.formula-table p { margin: 0 0 8px; color: var(--ink-soft); }.formula-table code { display: inline-block; color: var(--green); background: #e7f1ec; padding: 4px 8px; border-radius: 6px; font-size: .84rem; }
.before-after { display: grid; grid-template-columns: 1fr 42px 1fr; align-items: stretch; margin-top: 44px; }
.before-after article { padding: 25px; border: 1px solid var(--line); border-radius: 16px; }
.bad-example { background: #faece8; }.good-example { background: #e7f2ec; }
.example-label { margin: 0; font-size: .75rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.before-after blockquote { margin: 15px 0; font-family: Georgia, "Noto Serif KR", serif; font-size: 1.05rem; line-height: 1.7; }
.before-after article > p:last-child { margin: 0; font-size: .84rem; color: var(--ink-soft); }
.arrow { display: grid; place-items: center; font-size: 1.8rem; color: var(--coral); }
.learning-detail { margin-top: 22px; border: 1px solid var(--line); border-radius: 12px; background: white; }
.learning-detail summary { padding: 17px 20px; cursor: pointer; font-weight: 850; }
.learning-detail > div { padding: 0 20px 20px; }.learning-detail p { margin: 0; }
.mini-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 15px; }
.mini-compare p { padding: 14px; background: var(--paper); border-radius: 9px; font-size: .86rem; }

.builder-section { color: white; background: var(--green); }
.builder-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 24px; }
.builder-form, .builder-output { padding: clamp(20px, 3vw, 34px); border-radius: var(--radius); }
.builder-form { display: grid; gap: 16px; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.25); }
.builder-form label > span { display: block; margin-bottom: 6px; font-size: .84rem; font-weight: 800; }.builder-form label b { color: var(--yellow); font-size: .65rem; margin-left: 4px; }
.builder-form textarea { width: 100%; resize: vertical; padding: 11px 12px; color: var(--ink); background: #fffefb; border: 0; border-radius: 8px; line-height: 1.55; }
.builder-form textarea:focus { outline: 3px solid var(--yellow); }
.builder-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 5px; }.builder-actions .primary-button { background: var(--yellow); color: var(--ink); border-color: var(--yellow); box-shadow: none; }
.builder-output { background: var(--ink); border: 1px solid rgba(255,255,255,.15); }
.output-heading { display: flex; align-items: center; justify-content: space-between; gap: 10px; font-weight: 850; }
#builder-result { min-height: 330px; margin: 16px 0 20px; padding: 18px; white-space: pre-wrap; color: #eef6f1; background: rgba(0,0,0,.2); border: 1px dashed rgba(255,255,255,.3); border-radius: 10px; font-size: .84rem; line-height: 1.7; }
.builder-checklist { display: grid; gap: 7px; padding-top: 16px; border-top: 1px solid rgba(255,255,255,.2); font-size: .8rem; }
.builder-checklist strong { margin-bottom: 2px; color: var(--yellow); }.builder-checklist label { display: flex; gap: 8px; align-items: flex-start; }

.practice-list { display: grid; gap: 24px; }
.practice-card { padding: clamp(22px, 4vw, 36px); border: 1px solid var(--line); border-radius: var(--radius); background: white; box-shadow: 0 10px 30px rgba(24,51,47,.06); }
.practice-card.completed { border-color: var(--green); background: linear-gradient(90deg, #f4faf6, white); }
.practice-top { display: flex; align-items: center; gap: 10px; }
.practice-no { font-family: Georgia, serif; font-size: 1.7rem; font-weight: 900; color: var(--coral); }
.done-check { margin-left: auto; display: flex; align-items: center; gap: 6px; font-size: .78rem; font-weight: 800; cursor: pointer; }
.done-check input { width: 18px; height: 18px; accent-color: var(--green); }
.practice-card h3 { margin: 12px 0 4px; font-size: clamp(1.3rem, 2vw, 1.7rem); }.practice-goal { margin: 0 0 18px; color: var(--ink-soft); }.practice-goal b, .observe b { color: var(--green); }
.practice-steps { padding: 12px 18px; background: var(--paper); border-radius: 10px; }.practice-steps ol { margin: 0; padding-left: 20px; font-size: .86rem; }
.observe { margin: 20px 0 0; padding-left: 15px; border-left: 3px solid var(--yellow); font-size: .88rem; }
.chain-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 16px; }
.chain-grid div { display: flex; flex-direction: column; gap: 9px; padding: 17px; background: var(--paper); border-radius: 12px; }
.chain-grid div:not(:last-child)::after { content: "→"; align-self: flex-end; color: var(--coral); font-size: 1.4rem; }
.chain-grid code { font-size: .78rem; line-height: 1.65; }

.model-section { background: #f4efe4 !important; }
.model-tabs { display: flex; gap: 8px; border-bottom: 2px solid var(--ink); }
.model-tabs button { display: flex; align-items: center; gap: 8px; padding: 12px 18px; border: 1px solid var(--line); border-bottom: 0; color: var(--ink); background: rgba(255,255,255,.5); border-radius: 10px 10px 0 0; cursor: pointer; font-weight: 850; }
.model-tabs button img { width: 24px; height: 24px; object-fit: contain; }
.model-tabs button[aria-selected="true"] { color: white; background: var(--ink); border-color: var(--ink); }
.model-panel { padding: 34px; background: white; border: 1px solid var(--line); border-top: 0; border-radius: 0 0 16px 16px; }
.model-summary { display: grid; grid-template-columns: 78px minmax(0, 1fr); gap: 20px; align-items: center; }
.model-mark { width: 70px; height: 70px; display: grid; place-items: center; color: white; border-radius: 22px; font-family: Georgia, serif; font-size: 1.6rem; font-weight: 900; }
.model-mark.gpt { background: #222; }.model-mark.claude { background: #d36f4d; }.model-mark.gemini { background: #526fba; }
.model-summary h3 { margin: 0; font-size: 1.4rem; }.model-summary p { margin: 8px 0 0; color: var(--ink-soft); }
.model-tips { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 26px; }
.model-tips article { padding: 18px; background: var(--paper); border-radius: 12px; }.model-tips b { color: var(--green); }.model-tips p { margin: 6px 0 0; font-size: .86rem; }
.model-prompt { margin-top: 22px; }

.advanced-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 18px; }
.advanced-card { position: relative; padding: 30px; border: 1px solid var(--line); border-radius: 18px; background: white; overflow: hidden; }
.tech-number { position: absolute; right: 18px; top: 8px; color: rgba(232,110,82,.16); font: 900 4rem Georgia, serif; }
.advanced-card h3 { margin: 0 0 8px; font-size: 1.2rem; }.advanced-card > p { color: var(--ink-soft); }
.advanced-card pre { margin: 18px 0 0; padding: 15px; white-space: pre-wrap; color: #e9f4ee; background: var(--ink); border-radius: 10px; font-size: .76rem; line-height: 1.65; }

.diagnosis-section { color: white; background: var(--ink); }
.diagnosis-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.diagnosis-grid article { border: 1px solid rgba(255,255,255,.2); border-radius: 12px; background: rgba(255,255,255,.06); overflow: hidden; }
.diagnosis-toggle { width: 100%; display: flex; justify-content: space-between; gap: 14px; padding: 18px; border: 0; color: white; background: transparent; text-align: left; cursor: pointer; font-weight: 850; }
.diagnosis-toggle b { color: var(--yellow); font-size: 1.2rem; }
.diagnosis-body { display: none; padding: 0 18px 18px; }.diagnosis-grid article.open .diagnosis-body { display: block; }
.diagnosis-body p { margin: 0 0 10px; color: #c9d9d4; font-size: .85rem; }.diagnosis-body code { display: block; padding: 14px; white-space: pre-wrap; background: rgba(0,0,0,.22); border-radius: 8px; font-size: .76rem; line-height: 1.65; }.diagnosis-body .copy-button { margin-top: 10px; }

.safety-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }
.safety-card { padding: 25px; border: 1px solid var(--line); border-radius: 16px; }
.safety-card > span { font-size: .72rem; font-weight: 900; color: var(--coral); letter-spacing: .08em; }.safety-card h3 { margin: 9px 0 14px; }.safety-card ul { margin: 0; padding-left: 20px; font-size: .86rem; }
.input-safety { background: #fff5d7; }.output-safety { background: #e5f1ea; }.decision-safety { background: #f3eafa; }
.verification-card { display: grid; grid-template-columns: .72fr 1.28fr; gap: 28px; align-items: center; margin-top: 28px; padding: 30px; color: white; background: var(--green); border-radius: 18px; }
.verification-card h3 { margin: 0; font-size: 1.5rem; }.verification-card > div > p:last-child { color: #d8e9e2; }.verification-card .prompt-card { margin: 0; box-shadow: none; }

.source-list { display: grid; gap: 9px; }
.source-list a { display: grid; grid-template-columns: 90px minmax(0, 1fr) 24px; align-items: center; gap: 14px; padding: 17px; text-decoration: none; border: 1px solid var(--line); border-radius: 12px; background: white; transition: transform .15s ease, border-color .15s ease; }
.source-list a:hover { transform: translateX(4px); border-color: var(--green); }
.source-brand { text-align: center; padding: 4px 8px; border-radius: 999px; font-size: .67rem; font-weight: 900; }.source-brand.openai { background: #dfe6e3; }.source-brand.anthropic { background: #f3d9cd; }.source-brand.google { background: #dfe6fa; }
.source-list b, .source-list small { display: block; }.source-list small { margin-top: 3px; color: var(--ink-soft); }
.update-note { margin-top: 25px; padding: 22px; background: var(--paper); border-left: 4px solid var(--coral); }.update-note p { margin: 5px 0 0; }

.finish-section { padding: 100px clamp(28px, 7vw, 108px); text-align: center; color: white; background: var(--ink); }
.finish-section h2 { margin: 0; font-family: Georgia, "Noto Serif KR", serif; font-size: clamp(2rem, 4.5vw, 4rem); line-height: 1.25; }.finish-section > p:not(.section-kicker) { max-width: 680px; margin: 20px auto 30px; color: #cbdad5; }.finish-section .primary-button { color: var(--ink); background: var(--yellow); border-color: var(--yellow); box-shadow: 4px 4px 0 var(--coral); }
.site-footer { display: grid; grid-template-columns: 112px minmax(0, 1fr); align-items: start; gap: 28px; padding: 34px clamp(24px, 5vw, 72px); color: var(--ink-soft); background: var(--paper-deep); font-size: .78rem; line-height: 1.65; }
.site-footer img { width: 112px; height: 62px; object-fit: contain; }
.site-footer p { margin: 0 0 7px; }
.site-footer .footer-back-link { display: inline-flex; align-items: center; gap: 6px; margin-bottom: 12px; color: var(--green); font-size: .84rem; font-weight: 900; text-decoration-thickness: 2px; text-underline-offset: 3px; }
.site-footer .footer-course { color: var(--ink); font-weight: 800; }
.site-footer .copyright { color: var(--ink); font-weight: 900; letter-spacing: .01em; }
.site-footer .trademark-note { margin-bottom: 0; color: #60716d; font-size: .72rem; }
.toast { position: fixed; right: 24px; bottom: 24px; z-index: 100; padding: 11px 16px; color: white; background: var(--ink); border-radius: 9px; box-shadow: var(--shadow); opacity: 0; transform: translateY(15px); pointer-events: none; transition: .2s ease; font-size: .84rem; }.toast.show { opacity: 1; transform: translateY(0); }
[hidden], .search-hidden { display: none !important; }

@media (max-width: 1050px) {
  .hero { grid-template-columns: 1fr; padding-top: 62px; }.hero-board { max-width: 700px; min-height: 340px; transform: none; }
  .layout { grid-template-columns: 230px minmax(0, 1fr); }.sidebar-inner { padding: 26px 16px; }
  .content-section { padding-inline: clamp(24px, 5vw, 54px); }
  .builder-grid, .verification-card { grid-template-columns: 1fr; }.model-tips, .safety-grid { grid-template-columns: 1fr; }.chain-grid { grid-template-columns: 1fr; }
  .chain-grid div:not(:last-child)::after { content: "↓"; }
}

@media (max-width: 760px) {
  html { scroll-padding-top: 118px; }.topbar { height: 62px; padding-inline: 16px; }.brand span, .verified-date { display: none; }.top-actions { gap: 6px; }
  .hero { min-height: auto; padding: 52px 22px 64px; }.hero h1 { font-size: clamp(2.55rem, 13vw, 4.2rem); }.hero-board { padding: 30px 24px; min-height: 320px; }.board-formula { font-size: 1.35rem; }
  .mobile-tools { position: sticky; top: 62px; z-index: 45; display: flex; align-items: center; justify-content: space-between; padding: 9px 14px; background: rgba(247,242,231,.96); border-bottom: 1px solid var(--line); }.mobile-progress { font-size: .78rem; font-weight: 800; }
  .layout { display: block; }.sidebar { position: fixed; top: 111px; left: 0; bottom: 0; z-index: 44; width: min(86vw, 320px); transform: translateX(-105%); transition: transform .22s ease; background: var(--paper); box-shadow: var(--shadow); }.sidebar.open { transform: translateX(0); }.sidebar-inner { position: static; max-height: 100%; }
  .content-section { padding: 70px 20px; }.section-heading { margin-bottom: 32px; }.section-heading h2 { font-size: 2.15rem; }
  .quick-grid, .advanced-grid, .diagnosis-grid { grid-template-columns: 1fr; }.quick-card:nth-child(n) { transform: none; }.featured-prompt { margin-top: 25px; }
  .follow-up-strip { grid-template-columns: 1fr; }.follow-up-strip .copy-button { justify-self: start; }
  .formula-table article { grid-template-columns: 48px minmax(0,1fr); gap: 12px; }.before-after { grid-template-columns: 1fr; gap: 10px; }.arrow { transform: rotate(90deg); }
  .mini-compare { grid-template-columns: 1fr; }.builder-form, .builder-output { padding: 20px 16px; }#builder-result { min-height: 260px; }
  .prompt-card pre { padding: 38px 0 0; font-size: .78rem; }.prompt-card > .copy-button { top: 11px; right: 11px; }
  .model-tabs { overflow-x: auto; }.model-tabs button { flex: 1 0 auto; padding: 10px 12px; }.model-panel { padding: 24px 16px; }.model-summary { grid-template-columns: 1fr; }.model-mark { width: 55px; height: 55px; }.model-tips { grid-template-columns: 1fr; }
  .source-list a { grid-template-columns: 72px minmax(0,1fr) 18px; padding: 13px; }.source-list small { font-size: .72rem; }
  .site-footer { grid-template-columns: 1fr; gap: 14px; }.toast { left: 18px; right: 18px; bottom: 18px; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }*, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}

@media print {
  :root { --paper: white; --white: white; }
  body { font-size: 10pt; background: white; color: black; }
  .topbar, .sidebar, .mobile-tools, .reading-progress, .hero-actions, .print-button, .copy-button, .builder-actions, .toast, .reset-progress { display: none !important; }
  .hero { min-height: 0; display: block; padding: 28px 0; background: white; border-bottom: 2px solid black; }.hero h1 { font-size: 32pt; }.hero-board { margin-top: 24px; min-height: 0; color: black; background: white; box-shadow: none; transform: none; }.hero-note { color: black; }
  .layout { display: block; max-width: none; }.content-section { break-before: page; padding: 24px 0; border: 0; }.intro-section { break-before: auto; }.builder-section, .diagnosis-section, .finish-section { color: black; background: white; }.light-heading h2, .light-heading > p:last-child { color: black; }
  .practice-card, .advanced-card, .model-panel, .safety-card, .source-list a { break-inside: avoid; box-shadow: none; }.prompt-card, .advanced-card pre, .diagnosis-body code { color: black; background: #f2f2f2; box-shadow: none; border: 1px solid #aaa; }.prompt-card pre { padding: 0; }
  .diagnosis-body { display: block !important; }.diagnosis-toggle { color: black; padding-left: 0; }.diagnosis-toggle b { display: none; }.builder-grid, .advanced-grid, .safety-grid { grid-template-columns: 1fr; }.builder-form { display: none; }.builder-output { color: black; border: 1px solid #aaa; }#builder-result { color: black; background: white; }
  a { text-decoration: none; }.source-list a::after { content: " (" attr(href) ")"; font-size: 7pt; }
  .site-footer { grid-template-columns: 90px 1fr; padding: 20px 0; background: white; border-top: 1px solid black; }
}