:root {
  --ink: #1a1720;
  --ink-soft: #454050;
  --muted: #7a7285;
  --line: #e8e2ee;
  --paper: #faf8fc;
  --white: #ffffff;
  --plum: #6b3f6b;
  --plum-soft: #f3e8f3;
  --sage: #4a6b55;
  --sage-soft: #e4efe7;
  --amber: #8b6914;
  --amber-soft: #f7edd3;
  --blue: #2b5797;
  --blue-soft: #e3edf7;
  --sidebar: #1e1c22;
  --shadow: 0 8px 30px rgba(26, 23, 32, 0.08);
  --radius: 8px;
}

* { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; }
body { background: var(--paper); color: var(--ink); font-family: "DM Sans", "Noto Sans SC", sans-serif; line-height: 1.6; }
button, input { font: inherit; }
a { color: inherit; text-decoration: none; }

/* ── Sidebar ── */
.sidebar {
  position: fixed; inset: 0 auto 0 0; width: 260px; padding: 28px 0 28px 22px;
  background: var(--sidebar); color: #f0ecf2; display: flex; flex-direction: column; z-index: 10;
}
.brand { color: inherit; text-decoration: none; display: flex; align-items: center; gap: 14px; padding: 0 10px 30px; border-bottom: 1px solid #36333d; }
.brand-icon { width: 38px; height: 38px; display: grid; place-items: center; background: #9b6b9b; color: #1a1720; font-size: 16px; border-radius: 8px; }
.brand strong { display: block; font-size: 14px; font-weight: 600; }
.brand small { display: block; margin-top: 2px; color: #9088a0; font-size: 10px; text-transform: uppercase; letter-spacing: 0.5px; }
nav { flex: 1; margin-top: 24px; overflow-y: auto; }
.nav-label { margin: 24px 10px 8px; color: #6b6280; font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; }
.nav-link { display: flex; align-items: center; gap: 10px; min-height: 42px; padding: 0 10px; color: #c8c0d0; font-size: 13px; border-radius: 6px; transition: all .15s; }
.nav-link span:first-child { width: 20px; text-align: center; font-size: 14px; opacity: 0.6; }
.nav-link:hover, .nav-link.active { background: #2e2a35; color: #fff; }
.nav-link.active { background: #3a3545; }
.sidebar-note { margin-top: auto; padding: 16px 14px; background: #2e2a35; border-radius: 8px; display: flex; gap: 10px; align-items: center; }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: #6b9e6b; flex-shrink: 0; }
.sidebar-note strong { font-size: 11px; display: block; }
.sidebar-note small { color: #9088a0; font-size: 10px; display: block; margin-top: 2px; }

/* ── Main ── */
main { margin-left: 260px; min-height: 100vh; }
.topbar {
  height: 56px; padding: 0 6vw; display: flex; align-items: center; gap: 16px;
  border-bottom: 1px solid var(--line); background: rgba(250,248,252,.95);
  position: sticky; top: 0; z-index: 5; backdrop-filter: blur(12px);
}
.breadcrumb { color: var(--muted); font-size: 12px; flex: 1; }
.search-button {
  border: 1px solid var(--line); background: var(--white); color: var(--muted);
  min-width: 260px; height: 36px; padding: 0 12px; display: flex; gap: 8px; align-items: center;
  border-radius: 6px; cursor: pointer; transition: border-color .15s;
}
.search-button:hover { border-color: var(--plum); }
.search-button span:first-child { font-size: 16px; }
.search-button span:nth-child(2) { flex: 1; text-align: left; font-size: 12px; }
kbd { padding: 2px 6px; border: 1px solid var(--line); border-radius: 3px; background: var(--paper); color: var(--muted); font-size: 9px; }
.menu-button { display: none; border: 0; background: transparent; font-size: 20px; cursor: pointer; }

/* ── Hero ── */
.hero { padding: 80px 6vw 64px; background: linear-gradient(135deg, var(--paper) 0%, var(--plum-soft) 100%); }
.eyebrow { color: var(--plum); font-size: 10px; font-weight: 700; letter-spacing: 2px; }
h1 { margin: 18px 0 16px; max-width: 700px; font-size: clamp(36px, 4vw, 56px); line-height: 1.12; letter-spacing: -0.5px; font-weight: 700; }
h1 span { color: var(--plum); }
.hero > p { max-width: 600px; color: var(--ink-soft); font-size: 15px; line-height: 1.8; }
.hero-stats { display: flex; gap: 48px; margin-top: 40px; }
.hero-stats div { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 28px; font-weight: 700; color: var(--plum); }
.hero-stats span { margin-top: 4px; color: var(--muted); font-size: 11px; }

/* ── Sections ── */
.section-block { padding: 56px 6vw; border-top: 1px solid var(--line); }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 32px; flex-wrap: wrap; gap: 8px; }
.section-head > div { display: flex; align-items: baseline; gap: 12px; }
.section-label { color: var(--plum); font-size: 10px; font-weight: 700; letter-spacing: 1px; }
.section-head h2 { margin: 0; font-size: 22px; font-weight: 700; }
.section-head p { max-width: 400px; margin: 0; color: var(--muted); font-size: 12px; }

/* ── Phase Overview Grid ── */
.phase-overview-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.phase-card { padding: 24px; background: var(--white); transition: background .15s; }
.phase-card:hover { background: var(--plum-soft); }
.phase-num { font-size: 10px; font-weight: 700; color: var(--plum); margin-bottom: 8px; }
.phase-card h3 { margin: 0 0 2px; font-size: 16px; }
.phase-card h4 { margin: 0 0 10px; color: var(--plum); font-size: 11px; font-weight: 400; }
.phase-card p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.6; min-height: 40px; }
.phase-card footer { margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--line); font-size: 10px; color: var(--sage); }

/* ── Phase Detail ── */
.phase-detail { margin-bottom: 40px; }
.phase-detail-header { padding: 20px 24px; background: var(--plum-soft); border-radius: var(--radius) var(--radius) 0 0; display: flex; align-items: baseline; gap: 14px; }
.phase-detail-header .num { font-size: 12px; font-weight: 700; color: var(--plum); }
.phase-detail-header h3 { margin: 0; font-size: 18px; }
.phase-detail-header .cn { color: var(--plum); font-size: 14px; }
.phase-detail-body { padding: 24px; background: var(--white); border: 1px solid var(--line); border-top: 0; border-radius: 0 0 var(--radius) var(--radius); }
.phase-detail-body > p { color: var(--ink-soft); font-size: 13px; margin: 0 0 16px; }

/* ── Technique Cards ── */
.technique-card { padding: 24px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 12px; transition: border-color .15s; cursor: pointer; }
.technique-card:hover { border-color: var(--plum); }
.technique-card .tc-top { display: flex; align-items: baseline; gap: 10px; margin-bottom: 6px; }
.technique-card .tc-phase { font-size: 10px; color: var(--plum); background: var(--plum-soft); padding: 2px 8px; border-radius: 4px; }
.technique-card h3 { margin: 0; font-size: 16px; }
.technique-card .tc-en { color: var(--muted); font-size: 12px; margin-left: auto; }
.technique-card .tc-def { color: var(--ink-soft); font-size: 13px; line-height: 1.7; margin-bottom: 14px; }
.technique-card .tc-resources { display: flex; flex-wrap: wrap; gap: 8px; }
.technique-card .tc-tag { font-size: 10px; padding: 3px 8px; border-radius: 4px; display: inline-flex; align-items: center; gap: 4px; }
.technique-card .tc-tag.books { background: var(--amber-soft); color: var(--amber); }
.technique-card .tc-tag.articles { background: var(--blue-soft); color: var(--blue); }
.technique-card .tc-tag.tools { background: var(--sage-soft); color: var(--sage); }

/* ── Filter Row ── */
.filter-row { display: flex; gap: 6px; margin-bottom: 20px; flex-wrap: wrap; }
.filter-btn { border: 1px solid var(--line); background: var(--white); color: var(--muted); padding: 7px 14px; border-radius: 6px; cursor: pointer; font-size: 12px; transition: all .15s; }
.filter-btn:hover { border-color: var(--plum); }
.filter-btn.active { background: var(--plum); border-color: var(--plum); color: #fff; }

/* ── Book Cards ── */
.book-card { padding: 24px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 12px; display: grid; grid-template-columns: auto 1fr auto; gap: 20px; align-items: start; }
.book-card .book-icon { width: 44px; height: 56px; background: var(--amber-soft); border-radius: 4px; display: grid; place-items: center; font-size: 20px; }
.book-card h3 { margin: 0 0 4px; font-size: 15px; }
.book-card .book-author { color: var(--muted); font-size: 12px; margin-bottom: 8px; }
.book-card .book-topics { display: flex; flex-wrap: wrap; gap: 6px; }
.book-card .book-tag { font-size: 10px; padding: 2px 8px; background: var(--paper); border-radius: 4px; color: var(--ink-soft); }
.book-card .book-link { color: var(--plum); font-size: 12px; white-space: nowrap; }
.book-card .book-link:hover { text-decoration: underline; }

/* ── Course Cards ── */
.course-card { padding: 24px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 12px; display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.course-card h3 { margin: 0 0 4px; font-size: 15px; }
.course-card .course-meta { color: var(--muted); font-size: 12px; }
.course-card .course-link { color: var(--plum); font-size: 12px; white-space: nowrap; }

/* ── Template Cards ── */
.template-card { padding: 20px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 10px; }
.template-card h3 { margin: 0 0 4px; font-size: 14px; }
.template-card p { margin: 0 0 10px; color: var(--muted); font-size: 12px; }
.template-card a { color: var(--plum); font-size: 12px; }

/* ── Learning Paths ── */
.path-card { padding: 28px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 16px; }
.path-card h3 { margin: 0 0 4px; font-size: 18px; }
.path-card .path-meta { color: var(--muted); font-size: 12px; margin-bottom: 16px; }
.path-card p { color: var(--ink-soft); font-size: 13px; margin: 0 0 20px; }
.path-steps { display: flex; flex-direction: column; gap: 10px; }
.path-step { display: flex; gap: 14px; align-items: flex-start; padding: 12px 14px; background: var(--paper); border-radius: 6px; }
.path-step .step-num { width: 28px; height: 28px; background: var(--plum); color: #fff; border-radius: 50%; display: grid; place-items: center; font-size: 11px; font-weight: 700; flex-shrink: 0; }
.path-step .step-content { flex: 1; }
.path-step h4 { margin: 0 0 4px; font-size: 13px; }
.path-step .step-detail { color: var(--muted); font-size: 11px; }
.path-step .step-detail span { margin-right: 12px; }

/* ── Dialog ── */
dialog { width: min(860px, calc(100vw - 40px)); max-height: calc(100vh - 40px); padding: 0; border: 0; border-radius: 12px; background: var(--paper); box-shadow: var(--shadow); }
dialog::backdrop { background: rgba(26, 23, 32, .55); backdrop-filter: blur(4px); }
.dialog-close { position: sticky; float: right; top: 16px; right: 16px; width: 34px; height: 34px; border: 1px solid var(--line); background: var(--white); border-radius: 6px; cursor: pointer; font-size: 18px; z-index: 2; }
.dialog-hero { padding: 40px 44px 28px; background: var(--plum-soft); border-bottom: 1px solid var(--line); }
.dialog-hero .dh-phase { font-size: 10px; color: var(--plum); text-transform: uppercase; letter-spacing: 1px; }
.dialog-hero h2 { margin: 8px 0 4px; font-size: 28px; }
.dialog-hero .dh-en { color: var(--muted); font-size: 13px; margin-bottom: 12px; }
.dialog-hero p { color: var(--ink-soft); font-size: 13px; line-height: 1.7; }
.dialog-body { padding: 32px 44px 40px; }
.dialog-section { margin-bottom: 28px; }
.dialog-section h3 { margin: 0 0 12px; font-size: 13px; color: var(--ink); display: flex; align-items: center; gap: 8px; }
.dialog-section h3 .sec-icon { font-size: 16px; }
.dialog-section ul, .dialog-section ol { margin: 0; padding: 0 0 0 20px; }
.dialog-section li { color: var(--ink-soft); font-size: 13px; line-height: 1.7; margin-bottom: 4px; }
.resource-link { display: block; padding: 10px 14px; background: var(--paper); border: 1px solid var(--line); border-radius: 6px; margin-bottom: 6px; font-size: 13px; color: var(--plum); transition: border-color .15s; }
.resource-link:hover { border-color: var(--plum); }
.resource-link .rl-author { color: var(--muted); font-size: 11px; }
.tool-tag { display: inline-block; padding: 4px 10px; background: var(--sage-soft); color: var(--sage); border-radius: 4px; font-size: 12px; margin: 2px 4px 2px 0; }
.framework-tag { display: inline-block; padding: 4px 10px; background: var(--blue-soft); color: var(--blue); border-radius: 4px; font-size: 12px; margin: 2px 4px 2px 0; }

/* ── Search ── */
.search-overlay { position: fixed; inset: 0; background: rgba(26, 23, 32, .5); z-index: 20; padding: 12vh 20px; display: flex; justify-content: center; }
.search-panel { width: min(640px, 100%); max-height: 70vh; overflow: auto; background: var(--white); border-radius: 12px; box-shadow: var(--shadow); align-self: flex-start; }
.search-input-wrap { display: flex; align-items: center; gap: 10px; padding: 18px; border-bottom: 1px solid var(--line); }
.search-input-wrap span { font-size: 18px; color: var(--muted); }
.search-input-wrap input { flex: 1; border: 0; outline: 0; color: var(--ink); font-size: 15px; }
.search-item { width: 100%; padding: 14px 18px; border: 0; border-bottom: 1px solid var(--line); background: var(--white); text-align: left; cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.search-item:hover { background: var(--plum-soft); }
.search-item strong { display: block; font-size: 13px; }
.search-item small { color: var(--muted); font-size: 11px; }
.search-item .search-section { font-size: 10px; padding: 2px 8px; background: var(--paper); border-radius: 4px; color: var(--muted); }
.search-empty { padding: 20px; text-align: center; color: var(--muted); font-size: 13px; }

/* ── Footer ── */
footer { padding: 28px 6vw; color: var(--muted); font-size: 11px; border-top: 1px solid var(--line); }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .phase-overview-grid { grid-template-columns: repeat(2, 1fr); }
  .book-card { grid-template-columns: auto 1fr; }
}
@media (max-width: 760px) {
  .sidebar { transform: translateX(-100%); transition: transform .2s; }
  .sidebar.open { transform: translateX(0); }
  main { margin-left: 0; }
  .topbar { padding: 0 16px; }
  .menu-button { display: block; }
  .breadcrumb { display: none; }
  .search-button { min-width: 0; width: 38px; justify-content: center; }
  .search-button span:nth-child(2), .search-button kbd { display: none; }
  .hero { padding: 48px 20px 40px; }
  .hero > h1 { font-size: 32px; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .section-block { padding: 40px 20px; }
  .phase-overview-grid { grid-template-columns: 1fr; }
  .dialog-hero, .dialog-body { padding-left: 20px; padding-right: 20px; }
  .book-card { grid-template-columns: 1fr; }
  .course-card { flex-direction: column; align-items: flex-start; }
}