:root {
  --ink: #111827;
  --ink-soft: #344054;
  --muted: #667085;
  --line: #e5e7eb;
  --page: #f5f6f8;
  --paper: #ffffff;
  --navy: #101828;
  --navy-2: #19243a;
  --coral: #ff6b5b;
  --coral-soft: #fff0ed;
  --blue: #2f6fed;
  --blue-soft: #edf3ff;
  --yellow: #e5ae2f;
  --yellow-soft: #fff8df;
  --green: #1d9b74;
  --shadow: 0 18px 50px rgba(16, 24, 40, 0.07);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  font-family: "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: var(--page);
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--page); color: var(--ink); }
button, input { font: inherit; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
code { font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; }

.app-shell { min-height: 100vh; display: grid; grid-template-columns: 264px minmax(0, 1fr); }
.sidebar { position: sticky; top: 0; height: 100vh; padding: 28px 18px 22px; display: flex; flex-direction: column; background: var(--navy); color: #fff; overflow: hidden; }
.sidebar::after { content: ""; position: absolute; width: 230px; height: 230px; right: -140px; bottom: 80px; border: 1px solid rgba(255,255,255,.08); border-radius: 50%; box-shadow: 0 0 0 24px rgba(255,255,255,.025), 0 0 0 48px rgba(255,255,255,.02); pointer-events: none; }
.brand-lockup { display: flex; gap: 12px; align-items: center; padding: 0 10px 38px; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 12px; color: var(--navy); background: #fff; font-size: 12px; font-weight: 900; letter-spacing: -0.08em; }
.brand-lockup strong { display: block; font-size: 14px; letter-spacing: .02em; }
.brand-lockup span { display: block; margin-top: 4px; color: #98a2b3; font-size: 11px; }
.sidebar-label { padding: 0 10px 10px; color: #8c98ae; font-size: 10px; letter-spacing: .13em; text-transform: uppercase; }
.progress-track { height: 4px; margin: 0 10px; border-radius: 4px; background: rgba(255,255,255,.14); overflow: hidden; }
.progress-track span { display: block; width: 0; height: 100%; border-radius: inherit; background: var(--coral); transition: width .3s ease; }
.progress-copy { display: flex; justify-content: space-between; padding: 8px 10px 26px; color: #9aa6ba; font: 11px/1.2 "SFMono-Regular", monospace; }
.day-nav { display: grid; gap: 8px; }
.day-link { position: relative; width: 100%; display: grid; grid-template-columns: 32px minmax(0, 1fr) 18px; gap: 9px; align-items: center; padding: 12px 10px; border: 1px solid transparent; border-radius: 14px; background: transparent; color: #d8deea; text-align: left; transition: .2s ease; }
.day-link:hover { background: rgba(255,255,255,.07); }
.day-link.active { border-color: rgba(255,255,255,.12); background: var(--navy-2); box-shadow: inset 3px 0 0 var(--coral); }
.day-number { color: #8490a4; font: 12px/1 "SFMono-Regular", monospace; }
.day-link b { display: block; font-size: 13px; font-weight: 650; }
.day-link small { display: block; margin-top: 4px; color: #8995aa; font-size: 10px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nav-check { width: 17px; height: 17px; display: grid; place-items: center; border: 1px solid #556178; border-radius: 50%; color: transparent; font-size: 10px; transition: .2s; }
.day-link.complete .nav-check { border-color: var(--coral); background: var(--coral); color: #fff; }
.sidebar-bottom { position: relative; z-index: 1; margin-top: auto; padding: 18px 10px 0; }
.next-lesson { display: flex; gap: 9px; align-items: center; padding: 13px; border: 1px solid rgba(255,255,255,.1); border-radius: 13px; background: rgba(255,255,255,.05); }
.next-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--yellow); box-shadow: 0 0 0 4px rgba(229,174,47,.15); }
.next-lesson small { display: block; color: #8f9bb0; font-size: 10px; }
.next-lesson strong { display: block; margin-top: 3px; font-size: 11px; font-weight: 600; }
.pdf-link { display: flex; justify-content: space-between; margin-top: 16px; color: #9aa6ba; font-size: 11px; }
.pdf-link:hover { color: #fff; }

.main-content { min-width: 0; padding: 0 42px 40px; }
.topbar { height: 82px; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--line); }
.breadcrumb { display: flex; gap: 9px; align-items: center; color: var(--ink-soft); font-size: 12px; }
.breadcrumb i { color: #98a2b3; font-style: normal; }
.breadcrumb .muted { color: #98a2b3; }
.topbar-actions { display: flex; gap: 10px; align-items: center; }
.search-box { width: min(300px, 34vw); height: 37px; display: flex; gap: 8px; align-items: center; padding: 0 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--paper); color: #98a2b3; }
.search-box span { font-size: 20px; line-height: 1; transform: rotate(-20deg); }
.search-box input { width: 100%; border: 0; outline: 0; background: transparent; color: var(--ink); font-size: 12px; }
.search-box input::placeholder { color: #98a2b3; }
.icon-button { width: 37px; height: 37px; border: 1px solid var(--line); border-radius: 10px; background: var(--paper); color: var(--muted); font-size: 19px; }
.icon-button:hover { color: var(--ink); border-color: #cfd4dc; }

.hero-section { display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(360px, .98fr); gap: 42px; align-items: center; min-height: 330px; padding: 54px 0 46px; }
.section-kicker, .panel-kicker { margin: 0 0 12px; color: var(--blue); font-size: 11px; font-weight: 750; letter-spacing: .14em; text-transform: uppercase; }
.hero-copy h1 { max-width: 660px; margin: 0; font-size: clamp(37px, 4.5vw, 64px); font-weight: 760; letter-spacing: -.07em; line-height: 1.06; }
.hero-copy h1 span { color: var(--coral); }
.hero-description { max-width: 580px; margin: 22px 0 0; color: var(--muted); font-size: 15px; line-height: 1.85; }
.hero-actions { display: flex; gap: 18px; align-items: center; margin-top: 28px; }
.primary-button { display: inline-flex; gap: 14px; align-items: center; padding: 12px 17px; border: 0; border-radius: 10px; background: var(--ink); color: #fff; font-size: 12px; font-weight: 650; box-shadow: 0 9px 16px rgba(16,24,40,.14); transition: .2s; }
.primary-button:hover { transform: translateY(-2px); background: #1d2939; }
.primary-button span { color: var(--coral); font-size: 16px; }
.text-button { color: var(--ink-soft); font-size: 12px; font-weight: 650; }
.text-button span { margin-left: 6px; color: var(--coral); }
.hero-map { padding: 27px 27px 24px; border: 1px solid #e2e5ea; border-radius: var(--radius-lg); background: var(--paper); box-shadow: var(--shadow); }
.map-header { display: flex; justify-content: space-between; align-items: center; padding-bottom: 26px; border-bottom: 1px solid #eef0f3; }
.map-header span { color: var(--muted); font-size: 11px; }
.map-header strong { font-size: 12px; font-weight: 700; }
.route-line { display: grid; grid-template-columns: 52px minmax(18px, 1fr) 52px minmax(18px, 1fr) 52px minmax(18px, 1fr) 52px; gap: 8px; align-items: center; padding: 27px 0 20px; }
.route-node { display: flex; flex-direction: column; align-items: center; gap: 6px; }
.route-node span { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50%; font: 10px "SFMono-Regular", monospace; }
.route-node b { font-size: 12px; }
.route-node small { color: var(--muted); font-size: 10px; }
.route-node.done span { background: var(--coral-soft); color: var(--coral); }
.route-node.current span { background: var(--blue); color: #fff; box-shadow: 0 0 0 6px var(--blue-soft); }
.route-node.future span { background: #f0f2f5; color: #98a2b3; }
.route-connector { height: 2px; margin-top: -26px; background: #e4e7ec; }
.route-connector.done { background: var(--coral); }
.route-connector.current { background: linear-gradient(90deg, var(--blue), #e4e7ec); }
.hero-code { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; padding: 14px 16px; border-radius: 11px; background: var(--navy); color: #d5dbea; font: 11px/1.5 "SFMono-Regular", monospace; }
.code-comment { color: #8490a4; }
.hero-code code { color: #fff; }
.code-cursor { width: 6px; height: 14px; background: var(--coral); animation: blink 1.1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

.route-section, .practice-section, .competition-section { padding-top: 34px; }
.section-heading { display: flex; justify-content: space-between; gap: 20px; align-items: end; margin-bottom: 22px; }
.section-heading.compact { align-items: center; }
.section-heading h2, .competition-copy h2 { margin: 0; font-size: 27px; letter-spacing: -.045em; line-height: 1.2; }
.view-filters { display: flex; gap: 5px; padding: 4px; border-radius: 10px; background: #e9ebef; }
.filter-button { padding: 8px 12px; border: 0; border-radius: 7px; background: transparent; color: var(--muted); font-size: 11px; }
.filter-button.active { background: var(--paper); color: var(--ink); box-shadow: 0 2px 7px rgba(16,24,40,.08); }
.section-note { color: var(--muted); font-size: 11px; }
.day-panels { display: grid; gap: 15px; }
.day-panel { display: grid; grid-template-columns: 68px minmax(0, 1fr); gap: 14px; padding: 22px 24px 22px 20px; border: 1px solid #e5e7eb; border-radius: var(--radius-lg); background: var(--paper); box-shadow: 0 4px 14px rgba(16,24,40,.025); scroll-margin-top: 22px; transition: border-color .2s, box-shadow .2s, transform .2s; }
.day-panel:hover, .day-panel.active { border-color: #d8dce4; box-shadow: var(--shadow); }
.day-panel.active { transform: translateY(-2px); }
.panel-index { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 15px; font: 13px "SFMono-Regular", monospace; font-weight: 700; }
.panel-index.coral { background: var(--coral-soft); color: var(--coral); }
.panel-index.yellow { background: var(--yellow-soft); color: #b27b05; }
.panel-index.blue { background: var(--blue-soft); color: var(--blue); }
.panel-title-row { display: flex; justify-content: space-between; gap: 15px; align-items: start; }
.panel-kicker { margin-bottom: 7px; color: var(--muted); font-size: 10px; letter-spacing: .09em; }
.panel-title-row h3 { margin: 0; font-size: 20px; letter-spacing: -.035em; }
.status-label { flex: none; padding: 7px 9px; border-radius: 7px; background: #f2fbf7; color: var(--green); font-size: 10px; white-space: nowrap; }
.panel-intro { max-width: 850px; margin: 13px 0 21px; color: var(--muted); font-size: 12px; line-height: 1.75; }
.content-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.content-block { padding: 15px 16px; border-radius: var(--radius-md); }
.knowledge-block { background: var(--blue-soft); }
.mistake-block { background: var(--coral-soft); }
.content-block h4 { display: flex; gap: 7px; align-items: center; margin: 0 0 12px; font-size: 12px; }
.tiny-icon { width: 18px; height: 18px; display: grid; place-items: center; border-radius: 6px; font-size: 11px; }
.tiny-icon.blue { background: rgba(47,111,237,.13); color: var(--blue); }
.tiny-icon.coral { background: rgba(255,107,91,.14); color: var(--coral); }
.clean-list, .mistake-list { display: grid; gap: 10px; padding: 0; margin: 0; list-style: none; }
.clean-list li, .mistake-list li { display: grid; grid-template-columns: max-content 1fr; gap: 8px; align-items: baseline; color: var(--ink-soft); font-size: 11px; line-height: 1.4; }
.clean-list li code, .mistake-list li code { color: var(--ink); font-size: 10px; font-weight: 700; }
.clean-list li span, .mistake-list li span { color: var(--muted); }
.mistake-list li { display: flex; gap: 8px; align-items: baseline; }
.mistake-list li::before { content: ""; width: 4px; height: 4px; flex: none; margin-top: 5px; border-radius: 50%; background: var(--coral); }
.checklist { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; padding-top: 18px; }
.checklist label { display: flex; gap: 8px; align-items: flex-start; color: var(--muted); font-size: 10px; line-height: 1.45; cursor: pointer; }
.checklist input { appearance: none; width: 15px; height: 15px; flex: none; margin: 0; border: 1px solid #cdd3dd; border-radius: 5px; background: #fff; cursor: pointer; }
.checklist input:checked { border-color: var(--green); background: var(--green); box-shadow: inset 0 0 0 3px #fff; }
.checklist label.done { color: var(--green); text-decoration: line-through; text-decoration-thickness: 1px; }

.practice-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.practice-card { position: relative; min-height: 126px; display: flex; gap: 15px; align-items: start; padding: 20px; border-radius: var(--radius-lg); overflow: hidden; }
.practice-card::after { content: ""; position: absolute; right: -20px; bottom: -40px; width: 130px; height: 130px; border: 1px solid rgba(255,255,255,.5); border-radius: 50%; }
.coral-card { background: var(--coral); color: #fff; }.blue-card { background: var(--blue); color: #fff; }.yellow-card { background: #f3c54b; color: var(--ink); }
.practice-number { font: 11px "SFMono-Regular", monospace; opacity: .75; }
.practice-card h3 { margin: 0 0 7px; font-size: 15px; letter-spacing: -.02em; }.practice-card p { max-width: 210px; margin: 0; color: inherit; opacity: .82; font-size: 11px; line-height: 1.65; }
.practice-arrow { position: absolute; top: 19px; right: 20px; font-size: 17px; }

.competition-section { display: grid; grid-template-columns: .8fr 1.2fr; gap: 38px; align-items: center; margin-top: 50px; padding: 30px 30px 34px; border-radius: var(--radius-lg); background: var(--navy); color: #fff; }
.competition-section .section-kicker { color: #9bb7ff; }.competition-copy h2 { color: #fff; }.competition-copy p:not(.section-kicker) { max-width: 500px; margin: 15px 0 0; color: #aab5c8; font-size: 12px; line-height: 1.8; }
.competition-map { display: grid; grid-template-columns: 1fr 24px 1fr 24px 1fr; gap: 10px; align-items: center; }
.competition-map > div:not(.map-arrow) { min-height: 100px; padding: 16px; border: 1px solid rgba(255,255,255,.12); border-radius: 14px; background: rgba(255,255,255,.06); }.competition-map span { display: block; color: #9bb7ff; font: 10px "SFMono-Regular", monospace; }.competition-map strong { display: block; margin-top: 14px; font-size: 13px; }.competition-map small { display: block; margin-top: 6px; color: #9da9bb; font-size: 10px; }.map-arrow { color: var(--coral); font-size: 20px; text-align: center; }
.footer { display: flex; justify-content: space-between; gap: 18px; padding: 28px 0 6px; color: #98a2b3; font-size: 10px; }
.toast { position: fixed; left: 50%; bottom: 24px; z-index: 20; padding: 10px 14px; border-radius: 10px; background: var(--navy); color: #fff; font-size: 11px; opacity: 0; transform: translate(-50%, 14px); pointer-events: none; transition: .25s; }.toast.show { opacity: 1; transform: translate(-50%, 0); }
.search-hidden { display: none !important; }

@media (max-width: 980px) {
  .app-shell { grid-template-columns: 215px minmax(0, 1fr); }.main-content { padding: 0 26px 32px; }.hero-section { grid-template-columns: 1fr; gap: 25px; padding-top: 38px; }.hero-map { max-width: 660px; }.competition-section { grid-template-columns: 1fr; gap: 25px; }
}
@media (max-width: 700px) {
  .app-shell { display: block; }.sidebar { position: relative; width: 100%; height: auto; padding: 18px 16px 14px; }.sidebar::after { display: none; }.brand-lockup { padding-bottom: 18px; }.sidebar-label, .progress-track, .progress-copy, .sidebar-bottom { display: none; }.day-nav { grid-template-columns: repeat(3, 1fr); gap: 6px; }.day-link { grid-template-columns: 1fr; gap: 5px; padding: 10px 9px; }.day-number { font-size: 10px; }.day-link b { font-size: 11px; }.day-link small { display: none; }.nav-check { position: absolute; top: 8px; right: 8px; width: 13px; height: 13px; font-size: 8px; }.main-content { padding: 0 16px 26px; }.topbar { height: 66px; }.breadcrumb { font-size: 10px; }.search-box { width: 37px; padding: 0; justify-content: center; border: 0; background: transparent; }.search-box input { display: none; }.search-box span { font-size: 22px; }.icon-button { width: 30px; height: 30px; border-radius: 8px; font-size: 16px; }.hero-section { padding: 40px 0 25px; }.hero-copy h1 { font-size: 41px; }.hero-description { font-size: 13px; line-height: 1.7; }.hero-actions { margin-top: 22px; }.hero-map { padding: 18px; }.map-header { align-items: start; flex-direction: column; gap: 5px; }.route-line { grid-template-columns: 40px minmax(10px, 1fr) 40px minmax(10px, 1fr) 40px minmax(10px, 1fr) 40px; gap: 3px; }.route-node span { width: 30px; height: 30px; font-size: 9px; }.route-node b { font-size: 10px; }.route-node small { font-size: 8px; }.route-connector { margin-top: -23px; }.hero-code { font-size: 9px; }.section-heading { align-items: start; flex-direction: column; gap: 14px; }.section-heading h2, .competition-copy h2 { font-size: 23px; }.day-panel { grid-template-columns: 42px minmax(0, 1fr); gap: 12px; padding: 17px 14px 18px; }.panel-index { width: 36px; height: 36px; border-radius: 11px; font-size: 10px; }.panel-title-row { flex-direction: column; gap: 9px; }.panel-title-row h3 { font-size: 17px; }.content-grid, .practice-grid { grid-template-columns: 1fr; }.checklist { grid-template-columns: 1fr; gap: 8px; }.competition-section { margin-top: 35px; padding: 23px 18px; }.competition-map { grid-template-columns: 1fr; gap: 8px; }.competition-map > div:not(.map-arrow) { min-height: auto; }.map-arrow { transform: rotate(90deg); }.footer { flex-direction: column; gap: 7px; }
}