:root {
  color-scheme: light;
  --ink: #15201b;
  --muted: #66756f;
  --line: #dbe3dc;
  --paper: #f7f5ee;
  --panel: #ffffff;
  --green: #0f8f72;
  --green-dark: #075f4f;
  --accent: #c9872b;
  --dark: #111916;
  --shadow: 0 24px 70px rgba(17, 25, 22, 0.13);
  --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(circle at 80% 5%, rgba(15, 143, 114, 0.12), transparent 32rem),
    linear-gradient(180deg, #fbfaf6 0%, var(--paper) 54%, #ffffff 100%);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", "Helvetica Neue", Arial, sans-serif;
}
a { color: inherit; }
h1, h2, h3, p { overflow-wrap: anywhere; }
h1, h2, h3, p { margin: 0; }
h1 { max-width: 740px; font-size: clamp(3rem, 5.4vw, 5.6rem); line-height: 1.02; letter-spacing: 0; text-wrap: balance; }
h2 { max-width: 780px; font-size: clamp(2rem, 3.2vw, 3.25rem); line-height: 1.08; letter-spacing: 0; text-wrap: balance; }
h3 { font-size: 1.18rem; line-height: 1.25; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  min-height: 74px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 5vw, 64px);
  border-bottom: 1px solid rgba(219, 227, 220, .78);
  background: rgba(251, 250, 246, .86);
  backdrop-filter: blur(18px);
}

.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark { display: grid; width: 48px; height: 48px; place-items: center; overflow: hidden; border-radius: 14px; background: #000; color: #fff; font-weight: 900; }
.brand-mark img { width: 100%; height: 100%; object-fit: cover; display: block; }
.brand strong, .brand small { display: block; line-height: 1.05; }
.brand small { margin-top: 4px; color: var(--muted); font-size: .78rem; }
.site-nav { display: flex; align-items: center; gap: 6px; }
.site-nav a,
.site-nav button {
  min-height: 40px;
  padding: 10px 12px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: .95rem;
  font-weight: 750;
  text-decoration: none;
}
.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav button:hover,
.site-nav button:focus-visible {
  background: #fff;
  color: var(--ink);
}
.site-nav .nav-login {
  border: 1px solid var(--green-dark);
  background: var(--green-dark);
  color: #fff;
  cursor: pointer;
}
.site-nav .nav-login:hover,
.site-nav .nav-login:focus-visible {
  background: var(--dark);
  color: #fff;
}
main { overflow: hidden; }

.hero {
  display: grid;
  min-height: calc(100vh - 74px);
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, .72fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  padding: clamp(54px, 7vw, 96px) clamp(18px, 5vw, 64px) clamp(42px, 5vw, 70px);
}
.hero-copy { display: grid; gap: 24px; }
.eyebrow { color: var(--green-dark); font-size: .78rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.hero-lead, .section-heading p, .outcome-heading p, .day-feature p, .outcome-grid p, .capability-grid p, .system-grid p, .about-copy p, .starter-copy p, .kit-card li, .unlock-steps p, .risk-disclaimer p, #route-summary {
  color: var(--muted);
  font-size: 1.06rem;
  line-height: 1.72;
}
.hero-lead { max-width: 680px; font-size: clamp(1.08rem, 1.6vw, 1.25rem); }
.hero-actions, .route-actions, .starter-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button, .route-actions a {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  padding: 13px 18px;
  border-radius: 999px;
  font-weight: 900;
  text-decoration: none;
}
.primary, .route-actions a:first-child { border: 1px solid var(--green-dark); background: var(--green-dark); color: #fff; }
.ghost, .route-actions a:last-child { border: 1px solid var(--line); background: rgba(255,255,255,.78); color: var(--ink); }
.secondary, .route-actions a:nth-child(2) { border: 1px solid var(--dark); background: var(--dark); color: #fff; }
.trust-row { display: flex; flex-wrap: wrap; gap: 9px; color: var(--muted); }
.trust-row span { padding: 8px 12px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.72); font-size: .94rem; font-weight: 800; }

.hero-card, .quiz-card, .day-feature, .outcome-grid article, .capability-grid article, .system-grid article, .included-grid article, .kit-card, .login-card, .progress-card, .lesson-list, .lesson-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}
.hero-card {
  position: relative;
  overflow: hidden;
  padding: 22px;
  background: linear-gradient(145deg, #13221d, #0c1512);
  color: #d7f7e7;
}
.hero-card::before { content: ""; position: absolute; inset: -20% -20% auto auto; width: 260px; height: 260px; border-radius: 50%; background: rgba(15, 143, 114, .36); filter: blur(28px); }
.hero-card-top { position: relative; display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; color: rgba(255,255,255,.78); font-weight: 850; }
.hero-card-top strong { color: #f1c27a; }
.mock-chart { position: relative; display: grid; min-height: 470px; border: 1px solid rgba(255,255,255,.14); border-radius: 18px; background: rgba(255,255,255,.06); overflow: hidden; }
.chart-header, .chart-footer { display: flex; justify-content: space-between; gap: 8px; padding: 16px; color: rgba(255,255,255,.82); font-weight: 800; }
.chart-header { border-bottom: 1px solid rgba(255,255,255,.11); }
.chart-footer { border-top: 1px solid rgba(255,255,255,.11); flex-wrap: wrap; }
.mock-chart svg { align-self: center; width: 100%; height: auto; color: #4ee0b2; padding: 8px; }

.outcome-band, .system-section, .route-section, .content-section, .included-section, .about-section, .resource-strip, .unlock-band, .risk-disclaimer { padding: clamp(58px, 7vw, 96px) clamp(18px, 5vw, 64px); }
.outcome-band { display: grid; grid-template-columns: minmax(260px, .78fr) minmax(320px, 1fr); gap: 34px; align-items: start; border-top: 1px solid var(--line); }
.outcome-heading { display: grid; gap: 14px; max-width: 560px; }
.outcome-grid { display: grid; gap: 14px; }
.outcome-grid article { display: grid; gap: 10px; padding: 22px; box-shadow: none; }
.outcome-grid span { color: var(--accent); font-weight: 950; }
.capability-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.capability-grid article { display: grid; gap: 10px; padding: 22px; box-shadow: none; }
.capability-grid span { color: var(--accent); font-weight: 950; }

.system-section { display: grid; grid-template-columns: minmax(280px, .72fr) minmax(320px, 1fr); gap: 34px; align-items: start; border-top: 1px solid var(--line); background: #f5f2ea; }
.system-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.system-grid article { display: grid; gap: 10px; padding: 22px; box-shadow: none; }
.system-grid span { color: var(--green-dark); font-weight: 950; text-transform: uppercase; letter-spacing: .08em; font-size: .78rem; }

.section-heading { display: grid; max-width: 720px; gap: 14px; margin-bottom: 34px; }
.section-heading.center { max-width: 760px; margin-right: auto; margin-left: auto; text-align: center; justify-items: center; }
.section-cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 8px; }
.day-feature-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.day-feature { display: grid; min-height: 290px; align-content: start; gap: 14px; padding: 22px; box-shadow: none; }
.main-day { grid-column: span 2; grid-row: span 2; min-height: 420px; padding: clamp(24px, 3vw, 34px); background: linear-gradient(145deg, #ffffff, #f1fbf6); }
.main-day h3 { font-size: clamp(1.6rem, 3vw, 2.45rem); letter-spacing: 0; }
.day-feature ul { display: grid; gap: 9px; margin: 0; padding-left: 20px; color: var(--muted); line-height: 1.55; }
.final-day { background: #111916; color: #fff; }
.final-day p { color: rgba(255,255,255,.82); }
.access-label { width: fit-content; padding: 6px 10px; border: 1px solid rgba(15,143,114,.26); border-radius: 999px; background: #ecf8f3; color: var(--green-dark); font-size: .8rem; font-weight: 950; }
.access-label.locked { border-color: rgba(201,135,43,.34); background: #fff5e6; color: #94600d; }
.final-day .access-label.locked { background: rgba(255,255,255,.12); color: #f1c27a; border-color: rgba(255,255,255,.18); }
.card-actions { align-self: end; padding-top: 6px; }
.card-actions a {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  padding: 10px 13px;
  border: 1px solid rgba(15,143,114,.25);
  border-radius: 999px;
  background: #f3fbf7;
  color: var(--green-dark);
  font-size: .92rem;
  font-weight: 900;
  text-decoration: none;
}
.card-actions a:hover,
.card-actions a:focus-visible {
  border-color: var(--green-dark);
  background: var(--green-dark);
  color: #ffffff;
}
.final-day .card-actions a {
  border-color: rgba(255,255,255,.22);
  background: rgba(255,255,255,.1);
  color: #ffffff;
}
.final-day .card-actions a:hover,
.final-day .card-actions a:focus-visible {
  background: #ffffff;
  color: var(--ink);
}

.route-section { display: grid; grid-template-columns: minmax(260px, .72fr) minmax(320px, 1fr); gap: 34px; align-items: start; background: #f5f2ea; border-top: 1px solid var(--line); }
.quiz-card { min-height: 480px; padding: clamp(22px, 3vw, 32px); }
.quiz-topline { display: flex; min-height: 42px; align-items: center; justify-content: space-between; gap: 16px; color: var(--muted); font-size: .9rem; font-weight: 900; }
.icon-button { display: inline-grid; width: 40px; height: 40px; place-items: center; border: 1px solid var(--line); border-radius: 50%; background: #fff; color: var(--ink); cursor: pointer; font-size: 1.1rem; }
.progress-track { width: 100%; height: 8px; margin: 10px 0 28px; overflow: hidden; border-radius: 999px; background: #e8eee7; }
.progress-track span { display: block; width: 33%; height: 100%; background: linear-gradient(90deg, var(--green), var(--accent)); transition: width 180ms ease; }
#question-panel h2, .result-panel h2 { margin-bottom: 22px; }
.option-grid { display: grid; gap: 12px; }
.option-button { display: grid; min-height: 66px; grid-template-columns: 32px 1fr; gap: 12px; align-items: center; padding: 14px; border: 1px solid var(--line); border-radius: 16px; background: #fff; color: var(--ink); cursor: pointer; font: inherit; text-align: left; }
.option-button::before { content: ""; display: block; width: 32px; height: 32px; border: 1px solid #bfd0c6; border-radius: 50%; background: radial-gradient(circle at center, transparent 0 42%, #fff 43%), #eef8f4; }
.option-button:hover, .option-button:focus-visible, .icon-button:hover, .icon-button:focus-visible { border-color: var(--green); background: #f7fbf5; }
.option-button span { font-weight: 800; line-height: 1.35; }
.result-panel.is-hidden, #question-panel.is-hidden { display: none; }
.route-label { margin-bottom: 10px; color: var(--green-dark); font-size: .82rem; font-weight: 900; }
.route-steps { display: grid; gap: 10px; margin: 22px 0; padding-left: 24px; }
.route-steps li { padding-left: 4px; line-height: 1.55; }

.resource-strip { display: grid; grid-template-columns: minmax(300px, .72fr) minmax(300px, 1fr); gap: 32px; align-items: center; border-top: 1px solid var(--line); }
.resource-strip > div:first-child { display: grid; gap: 10px; }
.resource-pills { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 10px; }
.resource-pills a { padding: 12px 14px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: var(--ink); font-weight: 850; text-decoration: none; }
.resource-pills a.pill-cta { border-color: var(--green-dark); background: var(--green-dark); color: #ffffff; }

.included-section { border-top: 1px solid var(--line); background: #ffffff; }
.included-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin-bottom: 28px; }
.included-grid article {
  display: flex;
  min-height: 96px;
  align-items: center;
  padding: 18px;
  box-shadow: none;
  color: var(--ink);
  font-weight: 900;
  line-height: 1.35;
}

.about-section { display: grid; grid-template-columns: minmax(280px, .72fr) minmax(320px, 1fr); gap: 34px; align-items: start; border-top: 1px solid var(--line); }
.about-copy { display: grid; gap: 16px; max-width: 760px; }

.unlock-band { display: grid; grid-template-columns: minmax(360px, 1fr) minmax(320px, .68fr); gap: clamp(36px, 5vw, 72px); align-items: center; background: linear-gradient(135deg, rgba(7,95,79,.98), rgba(17,25,22,.96)), var(--dark); color: #fff; }
.unlock-band .eyebrow, .unlock-band p, .unlock-band li { color: rgba(255,255,255,.82); }
.unlock-band h2, .unlock-band h3, .unlock-band strong { color: #fff; }
.starter-copy { display: grid; gap: 20px; }
.unlock-steps { display: grid; gap: 12px; }
.unlock-steps > div { display: grid; grid-template-columns: 38px 1fr; gap: 4px 12px; padding: 16px; border: 1px solid rgba(255,255,255,.18); border-radius: 18px; background: rgba(255,255,255,.08); }
.unlock-steps span { display: grid; width: 34px; height: 34px; grid-row: span 2; place-items: center; border-radius: 50%; background: rgba(255,255,255,.15); font-weight: 950; }
.risk-note { padding-top: 14px; border-top: 1px solid rgba(255,255,255,.2); }
.kit-card { display: grid; gap: 18px; padding: 24px; color: var(--ink); }
.unlock-band .kit-card {
  background: #ffffff;
  color: var(--ink);
}
.unlock-band .kit-card h3 {
  color: var(--ink);
}
.unlock-band .kit-card li {
  color: var(--muted);
}
.unlock-band .kit-card .button.primary {
  color: #ffffff;
}
.unlock-band .kit-card .button.ghost {
  background: #ffffff;
  color: var(--ink);
}
.kit-card h3,
.kit-card strong {
  color: var(--ink);
}
.kit-card .button.primary {
  color: #ffffff;
}
.kit-card .button.ghost {
  background: #ffffff;
  color: var(--ink);
}
.quiz-card h2,
.quiz-card h3,
.quiz-card p,
.quiz-card li,
.quiz-card span {
  color: var(--ink);
}
.quiz-card .quiz-topline,
.quiz-card #quiz-step-label,
.quiz-card #route-summary,
.quiz-card .route-steps li {
  color: var(--muted);
}
.quiz-card .route-label {
  color: var(--green-dark);
}

.kit-card ul { display: grid; gap: 9px; margin: 0; padding-left: 22px; }
.kit-card li { line-height: 1.55; }
.kit-card .starter-actions .ghost { color: var(--ink); }
.risk-disclaimer { display: grid; grid-template-columns: minmax(180px, .24fr) minmax(300px, 1fr); gap: 22px; align-items: start; border-top: 1px solid rgba(219, 227, 220, .78); background: #fbfaf6; }
.risk-disclaimer strong { color: var(--ink); font-size: 1.05rem; }
.site-footer { display: flex; justify-content: space-between; gap: 16px; padding: 24px clamp(18px, 5vw, 64px); border-top: 1px solid var(--line); color: var(--muted); font-size: .92rem; }
.site-footer a { text-decoration: none; }

.auth-body,
.course-body {
  min-height: 100vh;
}

.auth-page {
  display: grid;
  min-height: calc(100vh - 74px);
  align-items: center;
  padding: clamp(44px, 7vw, 90px) clamp(18px, 5vw, 64px);
}

.auth-panel {
  display: grid;
  grid-template-columns: minmax(300px, 1fr) minmax(300px, .62fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
}

.auth-copy {
  display: grid;
  gap: 22px;
  max-width: 760px;
}

.auth-copy p,
.form-note,
.course-hero p,
.lesson-outcome,
.lesson-panel li,
.lesson-task p,
.setup-alert p {
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.72;
}

.auth-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.auth-highlights span {
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #ffffff;
  color: var(--green-dark);
  font-weight: 850;
}

.login-card {
  display: grid;
  gap: 18px;
  padding: clamp(22px, 3vw, 34px);
  box-shadow: none;
}

.login-card label {
  display: block;
  margin-bottom: 8px;
  color: var(--ink);
  font-weight: 900;
}

.login-card input {
  width: 100%;
  min-height: 54px;
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

.login-card input:focus {
  border-color: var(--green);
  outline: 3px solid rgba(15, 143, 114, .14);
}

.form-note[data-tone="warning"] {
  color: #94600d;
}

.form-note[data-tone="success"] {
  color: var(--green-dark);
}

.course-app {
  display: grid;
  gap: 24px;
  padding: clamp(34px, 5vw, 64px);
}

.course-hero {
  display: grid;
  grid-template-columns: minmax(300px, 1fr) minmax(280px, .34fr);
  gap: 24px;
  align-items: end;
}

.course-hero > div {
  display: grid;
  gap: 14px;
  max-width: 860px;
}

.course-hero h1 {
  font-size: clamp(2.3rem, 4.6vw, 4.6rem);
}

.progress-card {
  display: grid;
  gap: 14px;
  padding: 20px;
  box-shadow: none;
}

.progress-card span {
  color: var(--muted);
  font-size: .92rem;
  font-weight: 850;
}

.progress-card strong {
  color: var(--ink);
  font-size: 1.4rem;
}

.course-progress {
  margin: 0;
}

.setup-alert {
  display: grid;
  gap: 8px;
  padding: 16px 18px;
  border: 1px solid rgba(201, 135, 43, .32);
  border-radius: 18px;
  background: #fff7e8;
}

.setup-alert[hidden] {
  display: none;
}

.setup-alert strong {
  color: #94600d;
}

.course-layout {
  display: grid;
  grid-template-columns: minmax(240px, .32fr) minmax(320px, 1fr);
  gap: 18px;
  align-items: start;
}

.lesson-list,
.lesson-panel {
  box-shadow: none;
}

.lesson-list {
  position: sticky;
  top: 92px;
  display: grid;
  gap: 14px;
  padding: 16px;
}

.lesson-list-top {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 4px 4px 10px;
  color: var(--muted);
  font-size: .86rem;
  font-weight: 900;
}

#lesson-tabs {
  display: grid;
  gap: 9px;
}

.lesson-tab {
  display: grid;
  gap: 4px;
  width: 100%;
  min-height: 70px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  text-align: left;
}

.lesson-tab span {
  color: var(--green-dark);
  font-size: .78rem;
  font-weight: 950;
}

.lesson-tab strong {
  line-height: 1.3;
}

.lesson-tab[data-active="true"] {
  border-color: var(--green-dark);
  background: #eef8f4;
}

.lesson-tab[data-completed="true"] {
  border-color: rgba(15, 143, 114, .34);
}

.lesson-tab[data-completed="true"] strong::after {
  content: " 已完成";
  color: var(--green-dark);
  font-size: .78rem;
  font-weight: 900;
}

.lesson-panel {
  display: grid;
  gap: 22px;
  min-height: 620px;
  padding: clamp(22px, 3vw, 36px);
}

.lesson-panel-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.lesson-panel h2 {
  font-size: clamp(2rem, 3.2vw, 3.2rem);
}

.lesson-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.lesson-columns section,
.lesson-task {
  display: grid;
  gap: 12px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fbfaf6;
}

.lesson-columns h3 {
  color: var(--ink);
}

.lesson-columns ul {
  display: grid;
  gap: 9px;
  margin: 0;
  padding-left: 20px;
}

.lesson-task {
  background: linear-gradient(145deg, #13221d, #0c1512);
  color: #fff;
}

.lesson-task p {
  color: rgba(255,255,255,.78);
}

.lesson-task .button {
  width: fit-content;
  background: #ffffff;
  color: var(--ink);
  border-color: #ffffff;
}

@media (max-width: 1080px) {
  .hero, .outcome-band, .system-section, .route-section, .resource-strip, .about-section, .unlock-band, .risk-disclaimer, .auth-panel, .course-hero, .course-layout { grid-template-columns: 1fr; }
  .day-feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .included-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .resource-pills { justify-content: flex-start; }
  .lesson-list { position: static; }
}

@media (max-width: 760px) {
  h1 {
    font-size: 2.75rem;
  }

  h2 {
    font-size: 1.9rem;
  }

  .site-header { position: static; align-items: flex-start; flex-direction: column; gap: 12px; }
  .site-nav { width: 100%; overflow-x: auto; padding-bottom: 2px; }
  .site-nav a, .site-nav button { white-space: nowrap; }
  .hero { min-height: auto; }
  .mock-chart { min-height: 360px; }
  .day-feature-grid { grid-template-columns: 1fr; }
  .capability-grid, .system-grid, .included-grid { grid-template-columns: 1fr; }
  .lesson-columns { grid-template-columns: 1fr; }
  .main-day { grid-column: auto; grid-row: auto; min-height: auto; }
  .button, .route-actions a, .hero-actions a, .starter-actions a, .section-cta a, .card-actions a, .lesson-task .button { width: 100%; }
  .site-footer { flex-direction: column; }
}