:root {
  --primary: #0F172A;
  --primary-2: #1E293B;
  --accent: #3B82F6;
  --accent-hover: #2563EB;
  --amber: #F59E0B;
  --ink: #0F172A;
  --ink-2: #334155;
  --ink-3: #64748B;
  --line: #E2E8F0;
  --bg: #FFFFFF;
  --bg-soft: #F8FAFC;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 20px rgba(15, 23, 42, 0.06);
  --font-sans: "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --container: 1120px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
}
.site-header.scrolled { border-bottom-color: var(--line); }
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.02em;
}
.brand-mark { width: 30px; height: 30px; display: inline-flex; border-radius: 7px; overflow: hidden; }
.brand-mark svg { width: 100%; height: 100%; display: block; }
.nav { display: flex; gap: 28px; font-size: 14px; font-weight: 500; color: var(--ink-2); }
.nav a:hover { color: var(--ink); }
.header-actions { display: flex; align-items: center; gap: 10px; }
.lang-switch {
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-2);
}
.btn-login {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
}
.btn-login:hover { background: var(--primary-2); }
.nav-toggle { display: none; background: transparent; border: none; padding: 8px; flex-direction: column; gap: 5px; }
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--ink); border-radius: 2px; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.hero {
  padding: 88px 0 72px;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 64px;
  align-items: center;
}
.hero-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
}
.hero-title {
  font-size: 52px;
  font-weight: 750;
  line-height: 1.12;
  letter-spacing: -0.035em;
  margin-bottom: 20px;
}
.hero-title .hl { color: var(--accent); }
.hero-sub {
  font-size: 18px;
  color: var(--ink-3);
  max-width: 520px;
  margin-bottom: 32px;
  line-height: 1.7;
}
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 36px; }
.btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-2); }
.btn-ghost { background: #fff; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink-3); }
.hero-stats { display: flex; gap: 32px; flex-wrap: wrap; }
.hero-stat b { display: block; font-size: 22px; letter-spacing: -0.03em; }
.hero-stat span { font-size: 13px; color: var(--ink-3); }

.mock {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px 24px 24px;
  box-shadow: var(--shadow-md);
}
.mock-bar { display: flex; gap: 6px; margin-bottom: 18px; }
.mock-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--line); }
.mock-kicker { font-size: 11px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 8px; }
.mock-item {
  padding: 14px 0;
  border-top: 1px solid var(--line);
}
.mock-item:first-of-type { border-top: none; padding-top: 0; }
.mock-item h3 { font-size: 15px; margin-bottom: 4px; }
.mock-item p { font-size: 13px; color: var(--ink-3); }
.mock-pill {
  display: inline-block;
  margin-top: 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
}
.mock-draft {
  margin-top: 8px;
  padding: 12px 14px;
  background: var(--bg-soft);
  border-radius: 10px;
  font-size: 13px;
  color: var(--ink-2);
}

.section { padding: 96px 0; }
.section.alt { background: var(--bg-soft); }
#playbook { scroll-margin-top: 80px; }
.section-kicker {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.section-title {
  font-size: 36px;
  font-weight: 750;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 12px;
  max-width: 640px;
}
.section-sub { font-size: 17px; color: var(--ink-3); max-width: 560px; margin-bottom: 48px; }

.cap-grid, .who-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.cap-card, .who-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
}
.cap-num { font-size: 13px; font-weight: 700; color: var(--ink-3); margin-bottom: 12px; }
.cap-card h3, .who-card h3 { font-size: 20px; margin-bottom: 10px; letter-spacing: -0.02em; }
.cap-card p, .who-card p { font-size: 15px; color: var(--ink-3); line-height: 1.7; }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.step { padding-right: 12px; }
.step-n { font-size: 13px; font-weight: 700; color: var(--accent); margin-bottom: 10px; }
.step h3 { font-size: 20px; margin-bottom: 8px; letter-spacing: -0.02em; }
.step p { font-size: 15px; color: var(--ink-3); }

#playbook .section-sub { max-width: 720px; }
.sop-manifesto {
  max-width: 720px;
  margin: 8px 0 36px;
  padding: 20px 24px 20px 22px;
  border-left: 3px solid var(--accent);
  background: #F8FAFC;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}
.sop-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.sop-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
}
.sop-num { font-size: 13px; font-weight: 700; color: var(--ink-3); margin-bottom: 8px; }
.sop-card h3 { font-size: 18px; margin-bottom: 14px; letter-spacing: -0.02em; }
.sop-k {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 14px 0 4px;
}
.sop-sys {
  margin: 16px -4px 10px;
  padding: 14px 16px 16px;
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(59, 130, 246, 0.12), rgba(245, 158, 11, 0.08));
  border: 1px solid rgba(59, 130, 246, 0.28);
}
.sop-sys .sop-k {
  display: inline-block;
  margin: 0 0 8px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  letter-spacing: 0.02em;
  text-transform: none;
  font-size: 12px;
  line-height: 1.3;
}
.sop-sys p {
  color: var(--ink) !important;
  font-size: 15px !important;
  font-weight: 600;
  line-height: 1.7;
}
.sop-card p { font-size: 14px; color: var(--ink-3); line-height: 1.7; margin: 0; }
.sop-block-title {
  font-size: 22px;
  font-weight: 750;
  letter-spacing: -0.02em;
  margin: 48px 0 20px;
}
.sop-rhythm {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.sop-rhythm-card {
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}
.sop-rhythm-card h4 { font-size: 16px; margin-bottom: 8px; letter-spacing: -0.02em; }
.sop-rhythm-card p { font-size: 14px; color: var(--ink-3); line-height: 1.7; margin: 0; }
.sop-setup {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}
.sop-setup-item {
  padding: 16px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  font-size: 13px;
  color: var(--ink-2);
  line-height: 1.6;
}
.sop-setup-item b {
  display: block;
  font-size: 12px;
  color: var(--accent);
  margin-bottom: 6px;
}

.sop-read { margin-bottom: 8px; }
.sop-read .sop-block-title { margin-top: 8px; }
.sop-read-list {
  max-width: 720px;
  padding-left: 22px;
  font-size: 16px;
  color: var(--ink-2);
  line-height: 1.75;
}
.sop-read-list li + li { margin-top: 8px; }
.sop-lesson {
  margin-bottom: 16px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
}
.sop-lesson-week {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}
.sop-lesson > h3 {
  font-size: 22px;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}
.sop-lesson-lead {
  font-size: 16px;
  color: var(--ink-2);
  line-height: 1.7;
  margin: 0 0 14px;
  max-width: 720px;
}
.sop-lesson-body {
  font-size: 15px;
  color: var(--ink-2);
  line-height: 1.75;
  max-width: 720px;
}
.sop-lesson-body ul,
.sop-lesson-body ol {
  margin: 0;
  padding-left: 22px;
}
.sop-lesson-body li + li { margin-top: 8px; }
.sop-lesson .sop-k { margin-top: 18px; }
.sop-lesson .sop-sys { margin-top: 18px; }
.sop-lesson .sop-sys .sop-k { margin-top: 0; }
.sop-lesson > p {
  font-size: 14px;
  color: var(--ink-3);
  line-height: 1.7;
  margin: 0;
  max-width: 720px;
}
.sop-pits {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.sop-pit {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.65;
}

.not-list { display: grid; gap: 12px; max-width: 720px; }
.not-item {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 15px;
  color: var(--ink-2);
}

.legal-box {
  max-width: 720px;
  padding: 24px 28px;
  background: var(--bg-soft);
  border-radius: 12px;
  border: 1px solid var(--line);
  font-size: 15px;
  color: var(--ink-2);
  line-height: 1.75;
}

.ask-ai-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}
.ask-ai-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 124px;
  padding: 11px 16px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}
.ask-ai-btn:hover {
  border-color: var(--ink-3);
  color: var(--ink);
}

.site-footer {
  padding: 40px 0;
  border-top: 1px solid var(--line);
  color: var(--ink-3);
  font-size: 13px;
}
.footer-inner { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; align-items: center; }
.footer-links { display: flex; gap: 20px; }

.auth-page { min-height: calc(100vh - 64px); padding: 72px 0 80px; background: var(--bg-soft); }
.auth-card {
  max-width: 400px;
  margin: 0 auto;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 36px 32px;
}
.auth-card h1 { font-size: 26px; letter-spacing: -0.03em; margin-bottom: 8px; }
.auth-sub { font-size: 15px; color: var(--ink-3); margin-bottom: 24px; }
.auth-card label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.auth-card input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 15px;
  margin-bottom: 14px;
  font-family: inherit;
}
.auth-card input:focus { outline: none; border-color: var(--accent); }
.auth-card .btn { width: 100%; justify-content: center; margin-top: 6px; }
.auth-links { display: flex; justify-content: space-between; margin-top: 16px; font-size: 13px; }
.auth-links a { color: var(--accent); font-weight: 600; }
.auth-note { margin-top: 18px; font-size: 12.5px; color: var(--ink-3); line-height: 1.6; }
.auth-banner {
  display: none;
  margin-bottom: 16px;
  padding: 12px 14px;
  border-radius: 8px;
  background: #EFF6FF;
  color: var(--ink-2);
  font-size: 14px;
}
.auth-banner.show { display: block; }

@media (max-width: 900px) {
  .hero-grid, .cap-grid, .who-grid, .steps, .sop-grid, .sop-rhythm, .sop-pits { grid-template-columns: 1fr; }
  .sop-setup { grid-template-columns: 1fr 1fr; }
  .hero-title { font-size: 40px; }
  .hero { padding: 56px 0 48px; }
  .section { padding: 72px 0; }
}
@media (max-width: 640px) {
  .sop-setup { grid-template-columns: 1fr; }
  .container { padding: 0 20px; }
  .nav { display: none; }
  .nav-toggle { display: flex; }
  .nav.open {
    display: flex;
    position: absolute;
    top: 64px; left: 0; right: 0;
    background: #fff;
    flex-direction: column;
    padding: 8px 20px 16px;
    border-bottom: 1px solid var(--line);
    gap: 0;
  }
  .nav.open a { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .hero-title { font-size: 32px; }
  .section-title { font-size: 28px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}