@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Noto+Sans+SC:wght@400;500;600;700;800&display=swap');

:root {
  --blue: #1e3aba;
  --blue-bright: #006bff;
  --orange: #ff6b35;
  --ink: #1f2937;
  --muted: #64748b;
  --line: #e5e7eb;
  --paper: #f8fafc;
  --card: #ffffff;
  --rail: min(1440px, calc(100% - 48px));
}

* { box-sizing: border-box; }
html { background: var(--paper); }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Inter", "Noto Sans SC", "PingFang SC", sans-serif; }
.track-execution { --blue: #007c91; --blue-bright: #009bb5; --orange: #006bff; }
.track-management { --blue: #b24116; --blue-bright: #dc5d28; --orange: #1e3aba; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }

.site-rail { width: var(--rail); margin-inline: auto; }
.site-nav { min-height: 80px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.nav-shell { position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.95); backdrop-filter: blur(12px); border-bottom: 1px solid rgba(229,231,235,.8); box-shadow: 0 1px 2px rgba(0,0,0,.05); }
.brand { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand img { width: 120px; height: 40px; object-fit: contain; }
.brand-name { width: 78px; color: var(--blue); font-size: 16px; font-weight: 800; letter-spacing: .08em; line-height: 1.15; text-align: center; }
.nav-links { display: flex; align-items: center; gap: clamp(14px, 2vw, 32px); color: var(--ink); font-size: 14px; font-weight: 500; }
.nav-links a:hover { color: var(--blue-bright); }
.nav-cta { padding: 10px 18px; border-radius: 999px; color: #fff; background: var(--orange); font-weight: 700; font-size: 13px; box-shadow: 0 4px 10px rgba(255,107,53,.18); }

.lesson-main { min-height: calc(100vh - 80px); padding: clamp(24px, 4vw, 56px) 0; background: linear-gradient(120deg, rgba(30,58,186,.045), transparent 37%), var(--paper); }
.lesson-frame { width: var(--rail); margin: 0 auto; overflow: hidden; border: 1px solid var(--line); border-radius: 22px; background: var(--card); box-shadow: 0 18px 50px rgba(30,58,186,.08); }
.lesson-meta { display: flex; justify-content: space-between; align-items: center; gap: 12px; min-height: 54px; padding: 0 32px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 12px; font-weight: 700; letter-spacing: .08em; }
.lesson-meta strong { color: var(--blue); font-size: 13px; }
.progress-track { width: min(170px, 25vw); height: 4px; overflow: hidden; border-radius: 99px; background: #e8edf7; }
.progress-fill { width: 16.67%; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--blue), var(--blue-bright)); transition: width .25s ease; }

.slide { display: none; min-height: min(570px, calc(100vh - 190px)); padding: clamp(34px, 5vw, 78px) clamp(28px, 7vw, 110px) 34px; animation: lesson-in .32s ease both; }
.slide.active { display: flex; flex-direction: column; }
@keyframes lesson-in { from { opacity: 0; transform: translateX(14px); } to { opacity: 1; transform: translateX(0); } }
.eyebrow { margin-bottom: 22px; color: var(--orange); font-size: 12px; font-weight: 800; letter-spacing: .18em; text-transform: uppercase; }
.slide h1, .slide h2 { max-width: 980px; margin: 0; color: var(--ink); font-size: clamp(35px, 5vw, 68px); font-weight: 800; letter-spacing: -.048em; line-height: 1.08; text-wrap: balance; }
.slide h2 { font-size: clamp(30px, 3.5vw, 49px); }
.slide-lead { max-width: 810px; margin: 24px 0 0; color: var(--muted); font-size: clamp(16px, 1.6vw, 20px); line-height: 1.8; text-wrap: pretty; }
.accent-text { color: var(--blue); }
.hero-number { margin-top: auto; padding-top: 50px; color: #dce4f7; font-size: clamp(92px, 17vw, 210px); font-weight: 800; letter-spacing: -.1em; line-height: .72; user-select: none; }

.keyword-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.keyword { padding: 9px 14px; border: 1px solid #cfdaf6; border-radius: 999px; color: var(--blue); background: #f4f7ff; font-size: 14px; font-weight: 700; }
.content-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 42px; }
.content-card { min-height: 158px; padding: 22px; border: 1px solid var(--line); border-radius: 16px; background: #fff; }
.content-card .card-index { color: var(--orange); font-size: 12px; font-weight: 800; letter-spacing: .12em; }
.content-card h3 { margin: 18px 0 8px; color: var(--ink); font-size: 20px; letter-spacing: -.02em; }
.content-card p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.7; }
.ability-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); max-width: 980px; }
.ability-card { position: relative; display: block; min-height: 170px; border-color: #cfdaf6; background: linear-gradient(135deg, #f8faff, #fff); transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease; }
.ability-card h3 span { color: var(--blue); }
.ability-card:hover { transform: translateY(-3px); border-color: var(--blue); box-shadow: 0 12px 25px rgba(30, 58, 186, .12); }
.statement { max-width: 1020px; margin-top: 42px; padding: 26px 30px; border-left: 4px solid var(--orange); background: #fff6f2; color: #9a3514; font-size: clamp(18px, 2vw, 25px); font-weight: 700; line-height: 1.55; }

.career-lane { display: grid; grid-template-columns: 1fr 64px 1fr; gap: 18px; align-items: stretch; max-width: 1040px; margin-top: 42px; }
.lane-card { padding: 28px; border: 1px solid var(--line); border-radius: 16px; background: #fff; }
.lane-card.emphasis { border-color: #bfcaed; background: #f5f7ff; }
.lane-label { color: var(--orange); font-size: 12px; font-weight: 800; letter-spacing: .15em; }
.lane-card h3 { margin: 12px 0 16px; font-size: 23px; letter-spacing: -.03em; }
.lane-card ul { display: grid; gap: 10px; margin: 0; padding-left: 18px; color: var(--muted); font-size: 14px; line-height: 1.6; }
.lane-arrow { display: grid; place-items: center; color: var(--blue); font-size: 34px; font-weight: 600; }
.generic-note { max-width: 1040px; margin: 18px 0 0; color: var(--muted); font-size: 12px; line-height: 1.6; }

.upgrade-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; max-width: 1080px; margin-top: 44px; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; }
.upgrade-step { min-height: 230px; padding: 28px; border-right: 1px solid var(--line); background: #fff; }
.upgrade-step:last-child { border-right: 0; background: #f5f7ff; }
.upgrade-step .step-no { color: var(--orange); font-size: 12px; font-weight: 800; letter-spacing: .12em; }
.upgrade-step h3 { margin: 16px 0 12px; font-size: 22px; letter-spacing: -.025em; }
.upgrade-step p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.75; }

.check-list { display: grid; gap: 12px; max-width: 870px; margin-top: 38px; }
.check-item { padding: 16px 18px; border: 1px solid var(--line); border-radius: 12px; color: var(--ink); background: #fff; font-size: 15px; font-weight: 600; line-height: 1.55; }
.check-item::before { content: "✓"; display: inline-block; width: 25px; color: var(--orange); font-weight: 900; }

.slide-actions { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-top: auto; padding-top: 34px; }
.slide-actions button, .slide-actions a { min-height: 42px; padding: 10px 17px; border: 1px solid #cbd5e1; border-radius: 999px; color: var(--ink); background: #fff; cursor: pointer; font-size: 13px; font-weight: 700; }
.slide-actions button:hover, .slide-actions a:hover { border-color: var(--blue-bright); color: var(--blue-bright); }
.slide-actions .next { border-color: var(--blue); color: #fff; background: var(--blue); }
.slide-actions .next:hover { color: #fff; background: var(--blue-bright); }

.site-footer { padding: 64px 0 32px; color: #fff; background: var(--ink); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 44px; padding-bottom: 38px; border-bottom: 1px solid #46505e; }
.footer-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.footer-brand-box { display: inline-flex; padding: 10px; border-radius: 10px; background: #fff; }
.footer-brand img { width: 112px; height: 38px; object-fit: contain; }
.footer-copy { max-width: 360px; margin: 0; color: #aeb8c7; font-size: 14px; line-height: 1.75; }
.footer-grid h3 { margin: 0 0 16px; color: #e5e7eb; font-size: 14px; }
.footer-grid a { display: block; margin: 0 0 10px; color: #aeb8c7; font-size: 13px; }
.footer-grid a:hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; gap: 16px; padding-top: 24px; color: #9ca3af; font-size: 12px; }

@media (max-width: 760px) {
  :root { --rail: min(100% - 28px, 1440px); }
  .site-nav { min-height: 64px; }
  .brand img { width: 92px; height: 32px; }
  .brand-name { display: none; }
  .nav-links { display: none; }
  .nav-cta { padding: 8px 13px; font-size: 12px; }
  .lesson-main { padding: 16px 0 28px; }
  .lesson-frame { border-radius: 15px; }
  .lesson-meta { padding: 0 16px; min-height: 48px; font-size: 10px; }
  .slide { min-height: calc(100vh - 146px); padding: 36px 22px 24px; }
  .slide-lead { line-height: 1.7; }
  .content-grid, .ability-grid, .upgrade-steps { grid-template-columns: 1fr; }
  .content-grid { gap: 10px; margin-top: 28px; }
  .content-card { min-height: 0; padding: 18px; }
  .content-card h3 { margin-top: 12px; }
  .career-lane { grid-template-columns: 1fr; gap: 10px; margin-top: 28px; }
  .lane-arrow { height: 36px; transform: rotate(90deg); }
  .lane-card { padding: 20px; }
  .upgrade-step { min-height: 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .upgrade-step:last-child { border-bottom: 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-bottom { flex-direction: column; }
}