:root {
  --paper: #f5f1e8;
  --paper-deep: #e9e2d5;
  --ink: #18362e;
  --muted: #66726c;
  --orange: #e75e39;
  --yellow: #e8b64a;
  --line: rgba(24, 54, 46, 0.18);
  --serif: "Noto Serif SC", "Songti SC", STSong, Georgia, serif;
  --sans: Inter, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--sans); line-height: 1.5; }
a { color: inherit; text-decoration: none; }
.skip-link { position: fixed; z-index: 100; top: 1rem; left: 1rem; padding: .65rem 1rem; color: white; background: var(--ink); transform: translateY(-180%); }
.skip-link:focus { transform: translateY(0); }

.site-header { height: 70px; padding: 0 clamp(1rem, 4vw, 4rem); display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: .65rem; font-weight: 800; font-size: 1.08rem; letter-spacing: .08em; }
.brand small { margin-left: -.3rem; padding-left: .65rem; border-left: 1px solid var(--line); color: var(--muted); font-size: .55rem; font-weight: 650; letter-spacing: .13em; text-transform: uppercase; }
.brand-mark { display: inline-flex; width: 27px; height: 25px; align-items: flex-end; gap: 3px; transform: skewY(-12deg); }
.brand-mark span { display: block; width: 6px; background: var(--orange); border-radius: 1px; }
.brand-mark span:nth-child(1) { height: 10px; }.brand-mark span:nth-child(2) { height: 18px; }.brand-mark span:nth-child(3) { height: 25px; }
.main-nav { display: flex; gap: 2rem; font-size: .78rem; font-weight: 700; }
.main-nav a, .header-action { transition: color .2s; }
.main-nav a:hover, .header-action:hover { color: var(--orange); }
.header-action { padding: .55rem .8rem; border: 1px solid var(--ink); font-size: .72rem; font-weight: 800; }

.intro { padding: clamp(1.8rem, 4vw, 3.3rem) clamp(1rem, 4vw, 4rem) clamp(1.5rem, 3vw, 2.6rem); display: grid; grid-template-columns: .9fr 1.1fr; gap: clamp(2rem, 7vw, 8rem); align-items: end; background-image: radial-gradient(rgba(24,54,46,.1) .7px, transparent .7px); background-size: 20px 20px; }
.eyebrow { display: flex; align-items: center; gap: .55rem; margin: 0 0 .5rem; color: var(--orange); font-size: .62rem; font-weight: 850; letter-spacing: .15em; }
.eyebrow span { width: 24px; height: 2px; background: currentColor; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin: 0; font-family: var(--serif); font-size: clamp(2.4rem, 4.6vw, 4.7rem); line-height: .98; letter-spacing: -.05em; }
h1 br { display: none; }
h1 em { color: var(--orange); font-style: normal; }
.intro-copy > p { max-width: 690px; margin-bottom: 1rem; color: #4f625b; font-size: clamp(.88rem, 1.25vw, 1.02rem); }
.intro-copy strong { color: var(--ink); }
.route-key { display: flex; gap: 1.5rem; color: var(--muted); font-size: .7rem; }
.route-key span { padding-left: .65rem; border-left: 2px solid var(--orange); }
.route-key b { color: var(--ink); margin-right: .28rem; }

.course-section { padding: 1.2rem clamp(1rem, 4vw, 4rem) 2.2rem; background: #eee8dc; border-top: 1px solid var(--line); }
.catalog-layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: 1.5rem; }
.course-column { min-width: 0; }
.middle-school-column { padding-bottom: 1.35rem; border-bottom: 1px solid var(--line); }
.direction-column { padding-top: 1.35rem; border-top: 1px solid var(--line); }
.section-title { margin-bottom: 1rem; display: flex; align-items: end; justify-content: space-between; gap: 2rem; }
.section-title .eyebrow { margin-bottom: .15rem; }
.section-title h2 { margin: 0; font-family: var(--serif); font-size: clamp(1.55rem, 2.2vw, 2.15rem); line-height: 1.1; }
.section-title > p { margin: 0 0 .15rem; color: var(--muted); font-size: .72rem; }
.course-grid { display: grid; gap: .72rem; }
.middle-school-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.core-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.direction-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.course-card { min-width: 0; min-height: 232px; padding: .8rem .85rem; position: relative; display: flex; flex-direction: column; border: 1px solid rgba(24,54,46,.23); box-shadow: 3px 3px 0 rgba(24,54,46,.04); transition: transform .18s, box-shadow .18s; overflow: hidden; }
.course-card:hover { transform: translateY(-3px); box-shadow: 5px 7px 0 rgba(24,54,46,.08); }
.course-card-link { color: inherit; }
.middle-school-card h3 { white-space: normal; }
.card-entry { margin-top: auto; padding-top: .55rem; border-top: 1px solid rgba(24,54,46,.18); font-size: .62rem; font-weight: 800; text-align: right; }
.course-card-link:hover .card-entry, .course-card-link:focus-visible .card-entry { color: var(--orange); }
.tone-green { background: #dbe6df; }.tone-sand { background: #e8dfcf; }.tone-peach { background: #f1d8c6; }.tone-yellow { background: #eadcad; }
.tone-dark { color: #f5f1e8; background: var(--ink); border-color: var(--ink); }
.card-meta { display: flex; align-items: center; justify-content: space-between; gap: .5rem; color: var(--muted); font-size: .56rem; font-weight: 800; letter-spacing: .06em; white-space: nowrap; }
.tone-dark .card-meta { color: #b7c7c1; }
.course-number { color: var(--orange); font-family: var(--serif); font-size: .94rem; line-height: 1; }
.course-school { margin-top: .48rem; color: var(--orange); font-size: .5rem; font-weight: 900; letter-spacing: .11em; line-height: 1; }
.course-card h3 { margin: .2rem 0 .1rem; overflow: hidden; font-family: var(--serif); font-size: clamp(1.05rem, 1.25vw, 1.35rem); line-height: 1.08; letter-spacing: -.025em; text-overflow: ellipsis; white-space: nowrap; }
.course-card > p { margin-bottom: .7rem; color: #53665f; font-size: .67rem; }
.tone-dark > p { color: #b7c7c1; }
.card-links { margin-top: auto; padding-top: .55rem; display: grid; grid-template-columns: repeat(4, 1fr); gap: .3rem; border-top: 1px solid rgba(24,54,46,.18); font-size: .58rem; font-weight: 800; text-align: center; }
.tone-dark .card-links { border-color: rgba(255,255,255,.2); }
.card-links a { text-decoration: underline; text-decoration-color: transparent; text-underline-offset: 3px; transition: color .18s, text-decoration-color .18s; }
.card-links a:hover, .card-links a:focus-visible { color: var(--orange); text-decoration-color: currentColor; }
.is-unavailable { color: #9a9f9b; cursor: not-allowed; text-decoration: none; }
.tone-dark .is-unavailable { color: #71817b; }
.direction-card { border-top: 4px solid var(--orange); }

.course-visual { height: 70px; margin-top: .55rem; position: relative; border: 1px solid rgba(24,54,46,.16); background: rgba(245,241,232,.42); overflow: hidden; }
.tone-dark .course-visual { border-color: rgba(255,255,255,.2); background: rgba(255,255,255,.06); }
.visual-code { display: grid; grid-template-columns: repeat(3, 22px); align-content: center; justify-content: center; gap: 4px; }
.visual-code i { height: 22px; border: 2px solid var(--ink); background: var(--paper); }.visual-code i:nth-child(2) { background: var(--orange); }.visual-code b { position: absolute; right: 8px; bottom: 3px; color: var(--ink); font-family: var(--serif); font-size: 1rem; }
.visual-terminal { padding: .65rem; color: #dce8e3; background: var(--ink); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .62rem; }
.visual-terminal span { color: #f2a07c; margin-right: .35rem; }.visual-terminal b { font-weight: 500; }.visual-terminal i { display: inline-block; width: 6px; height: 10px; margin-left: 4px; vertical-align: middle; background: var(--yellow); animation: blink 1.2s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.visual-network .node-column { position: absolute; top: 8px; bottom: 8px; display: flex; flex-direction: column; justify-content: space-between; z-index: 2; }
.visual-network .input-layer { left: 16%; }.visual-network .hidden-layer { left: 49%; }.visual-network .output-layer { left: 83%; right: auto; justify-content: center; }
.visual-network .node-column i { display: block; width: 11px; height: 11px; border: 2px solid var(--ink); border-radius: 50%; background: var(--paper); }
.visual-network .hidden-layer i { background: var(--orange); }.visual-network .output-layer i { width: 15px; height: 15px; background: var(--ink); box-shadow: 0 0 0 3px rgba(231,94,57,.28); }
.visual-network > span { position: absolute; z-index: 1; height: 1px; background: rgba(24,54,46,.65); transform-origin: left center; }
.visual-network > span:nth-of-type(1){left:19%;top:14px;width:31.5%}.visual-network > span:nth-of-type(2){left:19%;top:34px;width:31.5%}.visual-network > span:nth-of-type(3){left:19%;top:54px;width:31.5%}.visual-network > span:nth-of-type(4){left:53%;top:14px;width:32%;transform:rotate(10deg)}.visual-network > span:nth-of-type(5){left:53%;top:34px;width:32%}.visual-network > span:nth-of-type(6){left:53%;top:54px;width:32%;transform:rotate(-10deg)}
.visual-matrix { display: flex; align-items: center; justify-content: center; gap: .25rem; font-family: var(--serif); }.visual-matrix > span { font-size: 2.7rem; font-weight: 300; line-height: 1; }.visual-matrix b { font-size: .72rem; line-height: 1.25; }.visual-matrix i { margin-left: .7rem; color: var(--orange); font-size: 2rem; font-style: normal; }
.visual-tree i { position: absolute; width: 10px; height: 10px; margin: -5px 0 0 -5px; border: 2px solid var(--ink); border-radius: 50%; background: var(--paper); z-index: 2; }.visual-tree i:nth-child(1){left:50%;top:14px;background:var(--orange)}.visual-tree i:nth-child(2){left:30%;top:38px}.visual-tree i:nth-child(3){left:70%;top:38px}.visual-tree i:nth-child(4){left:18%;top:60px}.visual-tree i:nth-child(5){left:42%;top:60px}.visual-tree span{position:absolute;z-index:1;height:1px;background:var(--ink);transform-origin:left center}.visual-tree span:nth-of-type(1){left:50%;top:14px;width:22%;transform:rotate(154deg)}.visual-tree span:nth-of-type(2){left:50%;top:14px;width:22%;transform:rotate(26deg)}.visual-tree span:nth-of-type(3){left:30%;top:38px;width:15%;transform:rotate(149deg)}.visual-tree span:nth-of-type(4){left:30%;top:38px;width:15%;transform:rotate(31deg)}
.visual-probability { display: flex; align-items: center; justify-content: center; gap: .15rem; font-family: var(--serif); }.visual-probability b { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 50%; color: white; background: var(--ink); font-size: 1.4rem; }.visual-probability span { font-size: 1rem; }.visual-probability i { position: absolute; width: 6px; height: 6px; border-radius: 50%; background: var(--orange); }.visual-probability i:nth-of-type(1){left:13%;top:17%}.visual-probability i:nth-of-type(2){right:12%;top:22%}.visual-probability i:nth-of-type(3){right:18%;bottom:13%}
.visual-chart span { position: absolute; left: 16px; right: 12px; bottom: 13px; height: 1px; background: var(--ink); transform: rotate(-20deg); }.visual-chart i { position: absolute; width: 7px; height: 7px; border: 1px solid var(--ink); border-radius: 50%; background: var(--paper); }.visual-chart i:nth-of-type(1){left:18%;bottom:20%}.visual-chart i:nth-of-type(2){left:38%;bottom:34%}.visual-chart i:nth-of-type(3){left:61%;bottom:47%;background:var(--orange)}.visual-chart i:nth-of-type(4){right:16%;top:18%}.visual-chart b{position:absolute;right:8px;bottom:5px;color:var(--orange);font-family:var(--serif)}
.visual-boundary span { position: absolute; left: 12%; right: 12%; top: 49%; height: 2px; background: var(--orange); transform: rotate(-18deg); }.visual-boundary i{position:absolute;width:7px;height:7px;border-radius:50%;background:var(--ink)}.visual-boundary i:nth-of-type(1){left:18%;top:20%}.visual-boundary i:nth-of-type(2){left:36%;top:31%}.visual-boundary i:nth-of-type(3){left:24%;top:43%}.visual-boundary i:nth-of-type(4){right:18%;bottom:17%;border:2px solid var(--ink);background:transparent}.visual-boundary i:nth-of-type(5){right:37%;bottom:28%;border:2px solid var(--ink);background:transparent}.visual-boundary i:nth-of-type(6){right:25%;bottom:44%;border:2px solid var(--ink);background:transparent}
.visual-layers { display: flex; align-items: center; justify-content: center; gap: 6px; }.visual-layers span { width: 18px; border: 2px solid var(--ink); background: var(--paper); box-shadow: 3px 3px 0 var(--orange); }.visual-layers span:nth-child(1){height:28px}.visual-layers span:nth-child(2){height:44px}.visual-layers span:nth-child(3){height:58px}.visual-layers b{margin-left:3px;color:var(--orange);font-size:1.3rem}
.visual-tokens { display: flex; align-items: center; justify-content: center; gap: 4px; }.visual-tokens span { padding: .24rem .36rem; border: 1px solid var(--ink); background: var(--paper); font-family: var(--serif); font-size: .65rem; }.visual-tokens span:nth-child(3){color:white;background:var(--ink)}.visual-tokens b{color:var(--orange)}
.visual-vision span { position: absolute; inset: 10px 29%; border: 2px solid var(--ink); }.visual-vision i { position: absolute; width: 12px; height: 12px; border: 1px solid rgba(24,54,46,.35); background: rgba(245,241,232,.65); }.visual-vision i:nth-of-type(1){left:29%;top:10px}.visual-vision i:nth-of-type(2){right:29%;top:10px}.visual-vision i:nth-of-type(3){left:29%;bottom:10px}.visual-vision i:nth-of-type(4){right:29%;bottom:10px;background:var(--orange)}.visual-vision b{position:absolute;right:12%;top:24%;font-size:1.45rem}
.visual-transformer { display: flex; align-items: center; justify-content: center; gap: 5px; }.visual-transformer span { padding: .26rem .35rem; border: 1px solid rgba(255,255,255,.5); font-size: .5rem; font-weight: 900; letter-spacing: .08em; }.visual-transformer span:nth-of-type(2){color:var(--ink);background:var(--yellow)}.visual-transformer i{width:14px;height:1px;background:var(--orange);position:relative}.visual-transformer i::after{content:"";position:absolute;right:-1px;top:-2px;width:4px;height:4px;border-top:1px solid var(--orange);border-right:1px solid var(--orange);transform:rotate(45deg)}

.tools-section { padding: 1.5rem clamp(1rem, 4vw, 4rem) 2rem; border-top: 1px solid var(--line); background: var(--paper); }
.tools-title { margin-bottom: 1rem; }
.tool-columns { display: grid; gap: .72rem; }
.tool-group { min-width: 0; padding-top: .72rem; display: grid; grid-template-columns: 145px minmax(0, 1fr); gap: .72rem; align-items: start; border-top: 1px solid var(--line); }
.tool-group > h3 { margin: .15rem 0 0; font-family: var(--serif); font-size: .88rem; line-height: 1.25; }
.tool-group > h3 span { margin-right: .35rem; color: var(--orange); font-size: .65rem; }
.tool-list { min-width: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(145px, 1fr)); gap: .55rem; }
.tool-card { min-width: 0; min-height: 82px; padding: .72rem; display: flex; align-items: center; gap: .7rem; border: 1px solid rgba(24,54,46,.2); background: #eee8dc; box-shadow: 3px 3px 0 rgba(24,54,46,.04); transition: transform .18s, border-color .18s, box-shadow .18s; }
.tool-card:hover { transform: translateY(-2px); border-color: var(--orange); box-shadow: 4px 5px 0 rgba(24,54,46,.07); }
.tool-card img { width: 38px; height: 38px; flex: 0 0 38px; object-fit: contain; border-radius: 9px; background: white; box-shadow: 0 0 0 1px rgba(24,54,46,.1); }
.tool-card div { min-width: 0; }
.tool-card h4 { margin: 0 0 .15rem; overflow: hidden; font-family: var(--serif); font-size: .9rem; line-height: 1.2; text-overflow: ellipsis; white-space: nowrap; }
.tool-card p { margin: 0; color: var(--muted); font-size: .64rem; line-height: 1.35; }

footer { min-height: 62px; padding: 1rem clamp(1rem, 4vw, 4rem); display: flex; align-items: center; justify-content: space-between; gap: 1rem; background: var(--paper-deep); border-top: 1px solid var(--line); color: var(--muted); font-size: .68rem; }
.footer-brand { color: var(--ink); }.footer-brand .brand-mark { transform: scale(.72) skewY(-12deg); }
footer p { margin: 0; }

.detail-page { min-height: 100vh; display: flex; flex-direction: column; }
.detail-main { width: 100%; flex: 1; }
.detail-hero { min-height: 330px; padding: clamp(3rem, 8vw, 7rem) clamp(1rem, 8vw, 9rem) 3rem; position: relative; display: flex; flex-direction: column; justify-content: end; border-bottom: 1px solid var(--line); background-color: #e6ded0; background-image: linear-gradient(120deg, transparent 0 63%, rgba(231,94,57,.12) 63% 64%, transparent 64%), radial-gradient(rgba(24,54,46,.12) .7px, transparent .7px); background-size: auto, 20px 20px; overflow: hidden; }
.detail-hero::after { content: attr(data-number); position: absolute; right: 6vw; bottom: -4rem; color: rgba(24,54,46,.055); font-family: var(--serif); font-size: clamp(12rem, 25vw, 25rem); line-height: 1; }
.detail-school { margin: 0 0 .6rem; color: var(--orange); font-size: .65rem; font-weight: 900; letter-spacing: .15em; text-transform: uppercase; }
.detail-hero h1 { position: relative; z-index: 1; font-size: clamp(3rem, 7vw, 7rem); }
.detail-subtitle { max-width: 680px; margin: .7rem 0 0; position: relative; z-index: 1; color: var(--muted); font-family: var(--serif); font-size: clamp(1rem, 2vw, 1.45rem); }
.detail-layout { padding: clamp(2rem, 5vw, 4.5rem) clamp(1rem, 8vw, 9rem); display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(240px, .75fr); gap: clamp(2rem, 8vw, 8rem); }
.detail-content section + section { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--line); }
.detail-label { margin-bottom: 1rem; color: var(--orange); font-size: .68rem; font-weight: 900; letter-spacing: .14em; }
.detail-description { max-width: 760px; font-family: var(--serif); font-size: clamp(1.15rem, 2vw, 1.6rem); line-height: 1.8; }
.detail-content ul { margin: 0; padding: 0; list-style: none; counter-reset: outcome; }
.detail-content li { padding: .8rem 0 .8rem 2.6rem; position: relative; border-bottom: 1px solid var(--line); font-size: .9rem; counter-increment: outcome; }
.detail-content li::before { content: "0" counter(outcome); position: absolute; left: 0; color: var(--orange); font-family: var(--serif); font-weight: 800; }
.course-roadmap { margin: 0; padding: 0; display: grid; gap: .7rem; list-style: none; }
.course-roadmap li { padding: 1rem; display: grid; grid-template-columns: 44px 1fr; gap: 1rem; border: 1px solid var(--line); background: rgba(233,226,213,.45); }
.course-roadmap li::before { content: none; }
.course-roadmap li > span { color: var(--orange); font-family: var(--serif); font-size: 1.25rem; font-weight: 800; }
.course-roadmap strong { font-family: var(--serif); font-size: .95rem; }
.course-roadmap p { margin: .25rem 0 0; color: var(--muted); font-size: .75rem; line-height: 1.6; }
.self-study-section { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.self-study-section > div + div { padding-left: 2rem; border-left: 1px solid var(--line); }
.compact-list { margin: 0; padding: 0; list-style: none; }
.compact-list li { padding: .55rem 0 .55rem 1.2rem; font-size: .76rem; }
.compact-list li::before { content: "→"; color: var(--orange); }
.advice-box { padding: 1.2rem 1.3rem; border-left: 4px solid var(--orange); background: var(--ink); color: var(--paper); }
.advice-box strong { color: var(--yellow); font-family: var(--serif); }
.advice-box p { margin: .35rem 0 0; color: #cbd6d1; font-size: .78rem; line-height: 1.7; }
.detail-facts { align-self: start; border-top: 3px solid var(--ink); }
.detail-facts > div { padding: 1.1rem 0; display: grid; gap: .35rem; border-bottom: 1px solid var(--line); }
.detail-facts span { color: var(--muted); font-size: .67rem; }
.detail-facts strong { font-family: var(--serif); font-size: 1rem; }
.detail-links { margin-top: 1.25rem; display: grid; gap: .5rem; }
.detail-links a, .detail-links span, .detail-back { padding: .75rem .9rem; border: 1px solid var(--ink); font-size: .72rem; font-weight: 800; transition: color .18s, background .18s; }
.detail-links a:hover { color: var(--paper); background: var(--ink); }
.detail-links .is-unavailable { border-color: rgba(24,54,46,.16); background: rgba(24,54,46,.04); }
.estimate-note { margin: 1rem 0 0; color: var(--muted); font-size: .62rem; line-height: 1.55; }
.detail-empty { padding: clamp(4rem, 10vw, 10rem) clamp(1rem, 8vw, 9rem); }
.detail-empty h1 { margin-bottom: 1rem; }
.detail-back { display: inline-block; margin-top: 1rem; }

:focus-visible { outline: 3px solid var(--orange); outline-offset: 3px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition: none !important; } }
@media (max-width: 1000px) {
  .catalog-layout { grid-template-columns: minmax(0, 1fr); }
  .tool-group { grid-template-columns: 125px minmax(0, 1fr); }
  .tool-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 760px) {
  .site-header { height: 64px; }.main-nav { display: none; }
  .intro { grid-template-columns: 1fr; gap: 1rem; align-items: start; }
  h1 br { display: initial; }
  .middle-school-grid, .core-grid, .direction-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tool-group { grid-template-columns: 1fr; gap: .5rem; }
  .tool-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .section-title > p { display: none; }
  .detail-layout { grid-template-columns: 1fr; }
  .self-study-section { grid-template-columns: 1fr; }
  .self-study-section > div + div { padding: 1.5rem 0 0; border-left: 0; border-top: 1px solid var(--line); }
}
@media (max-width: 440px) {
  .brand small, .header-action { display: none; }
  .route-key { gap: .75rem; flex-wrap: wrap; }
  .middle-school-grid, .core-grid, .direction-grid { grid-template-columns: 1fr; }
  .tool-list { grid-template-columns: 1fr; }
  .course-card { min-height: 205px; }
  footer { align-items: flex-start; flex-direction: column; }
}