/* ===========================
   设计 Token
   =========================== */
:root {
  --bg:       #f7fbf8;
  --dark1:    #133a34;
  --dark2:    #063f35;
  --accent:   #7ad9b0;
  --card:     rgba(255,255,255,.96);
  --border:   rgba(203,228,222,.82);
  --body:     #2a4a42;
  --muted:    #6b8c84;

  --radius-card: 18px;
  --radius-btn:  980px;
  --radius-icon: 12px;
  --section-v:   64px;
  --section-h:   32px;
  --gap:         12px;
}

/* ===========================
   Reset
   =========================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'PingFang SC', 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--dark1);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
button { cursor: pointer; font-family: inherit; }
strong { font-weight: 600; }

/* ===========================
   NAV
   =========================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--section-h);
  height: 52px;
  background: rgba(247,251,248,.88);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-logo { display: flex; align-items: center; gap: 9px; }

.logo-mark {
  width: 28px;
  height: 28px;
  background: var(--dark2);
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: -.5px;
  flex-shrink: 0;
}

.logo-name { font-size: 16px; font-weight: 600; color: var(--dark2); letter-spacing: -.3px; line-height: 1.2; }
.logo-sub  { font-size: 10px; color: var(--muted); line-height: 1; }

.nav-links { display: flex; gap: 24px; }
.nav-links a { font-size: 13px; color: var(--body); opacity: .85; transition: opacity .15s; }
.nav-links a:hover { opacity: 1; }

.nav-action {
  font-size: 13px;
  color: var(--dark2);
  font-weight: 500;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  background: var(--card);
}
.nav-action-mobile { display: none; font-size: 18px; }

/* Mobile menu */
.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 0;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 52px;
  z-index: 99;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  padding: 14px 24px;
  font-size: 15px;
  color: var(--dark1);
  border-bottom: 1px solid var(--border);
}
.mobile-menu a:last-child { border: none; }
.menu-login { color: var(--dark2) !important; font-weight: 500; }

/* ===========================
   HERO
   =========================== */
.hero {
  padding: 80px var(--section-h) 0;
  text-align: center;
  background: var(--bg);
  max-width: 900px;
  margin: 0 auto;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(122,217,176,.15);
  color: var(--dark2);
  font-size: 13px;
  font-weight: 500;
  padding: 5px 14px;
  border-radius: var(--radius-btn);
  border: 1px solid rgba(122,217,176,.35);
  margin-bottom: 24px;
  letter-spacing: .1px;
}

.hero-title {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -1.5px;
  color: var(--dark2);
  margin-bottom: 20px;
}
.hero-title-muted { color: var(--dark1); opacity: .55; }

.hero-lead {
  font-size: 19px;
  color: var(--muted);
  line-height: 1.65;
  max-width: 560px;
  margin: 0 auto 36px;
  letter-spacing: -.2px;
}
.hero-lead strong { color: var(--dark2); }

.hero-cta-group { display: flex; flex-direction: column; align-items: center; gap: 14px; }

.hero-proof { font-size: 13px; color: var(--muted); letter-spacing: -.1px; }
.hero-proof strong { color: var(--dark2); }

/* ===========================
   BUTTONS
   =========================== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--dark2);
  color: var(--accent);
  border: none;
  border-radius: var(--radius-btn);
  padding: 15px 32px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -.3px;
  transition: opacity .15s, transform .15s;
}
.btn-primary:hover { opacity: .88; transform: translateY(-1px); }
.btn-primary:active { transform: scale(.98); }

.btn-sticky {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent);
  color: var(--dark2);
  border: none;
  border-radius: var(--radius-btn);
  padding: 10px 22px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -.2px;
  flex-shrink: 0;
  transition: opacity .15s;
}
.btn-sticky:hover { opacity: .88; }

/* ===========================
   OUTCOME CARDS
   =========================== */
.outcomes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
  padding: 28px var(--section-h) 64px;
  max-width: 900px;
  margin: 0 auto;
}

.outcome-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 22px 20px;
}

.oc-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-icon);
  background: rgba(122,217,176,.18);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--dark2);
  margin-bottom: 14px;
}

.oc-title { font-size: 15px; font-weight: 600; color: var(--dark2); margin-bottom: 5px; letter-spacing: -.2px; }
.oc-desc  { font-size: 13px; color: var(--muted); line-height: 1.6; }

/* ===========================
   SECTIONS
   =========================== */
.section {
  padding: var(--section-v) var(--section-h);
  max-width: 900px;
  margin: 0 auto;
}

.section.alt {
  background: var(--card);
  max-width: 100%;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.section.alt > * { max-width: 836px; margin-left: auto; margin-right: auto; }

.section-eyebrow {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: .8px;
  text-transform: uppercase;
  margin-bottom: 10px;
  filter: brightness(.8);
}

.section-h2 {
  font-size: 34px;
  font-weight: 700;
  letter-spacing: -1px;
  color: var(--dark2);
  margin-bottom: 8px;
  line-height: 1.15;
}

.section-lead { font-size: 17px; color: var(--muted); margin-bottom: 36px; line-height: 1.6; letter-spacing: -.1px; }

/* ===========================
   WORRY GRID
   =========================== */
.worry-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }

.worry-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  cursor: pointer;
  transition: border-color .18s, transform .18s, background .18s;
}
.worry-card:hover { border-color: rgba(122,217,176,.7); background: #fff; transform: translateY(-2px); }
.worry-card.accent { background: rgba(122,217,176,.1); border-color: rgba(122,217,176,.45); }

.wc-icon  { font-size: 22px; margin-bottom: 10px; }
.wc-title { font-size: 15px; font-weight: 600; color: var(--dark2); margin-bottom: 4px; letter-spacing: -.2px; }
.wc-desc  { font-size: 13px; color: var(--muted); line-height: 1.55; }

/* ===========================
   STEPS
   =========================== */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: var(--border);
  border-radius: 20px;
  overflow: hidden;
  margin-top: 36px;
}

.step { background: var(--card); padding: 28px 24px; }
.step-num   { font-size: 32px; font-weight: 700; color: rgba(122,217,176,.5); line-height: 1; margin-bottom: 12px; letter-spacing: -1px; }
.step-title { font-size: 16px; font-weight: 600; color: var(--dark2); margin-bottom: 6px; letter-spacing: -.2px; }
.step-desc  { font-size: 13px; color: var(--muted); line-height: 1.6; }

/* ===========================
   TOPIC GRID
   =========================== */
.topic-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 36px; }

.topic-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: border-color .18s, transform .18s;
}
.topic-card:hover { border-color: rgba(122,217,176,.6); transform: translateY(-2px); }

.tc-icon  { font-size: 22px; flex-shrink: 0; }
.tc-title { font-size: 14px; font-weight: 600; color: var(--dark2); letter-spacing: -.1px; }
.tc-sub   { font-size: 12px; color: var(--muted); margin-top: 2px; }

/* ===========================
   ABOUT
   =========================== */
.about-section { padding-top: var(--section-v); padding-bottom: var(--section-v); }

.about-box {
  background: var(--dark2);
  border-radius: 24px;
  padding: 48px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.about-quote { font-size: 26px; font-weight: 700; color: #fff; line-height: 1.3; letter-spacing: -.5px; margin-bottom: 14px; }
.about-quote em { font-style: normal; color: var(--accent); }
.about-body { font-size: 15px; color: rgba(255,255,255,.6); line-height: 1.75; }

.about-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: rgba(255,255,255,.06);
  border-radius: 16px;
  overflow: hidden;
}

.about-item {
  padding: 16px 18px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  border-bottom: 1px solid rgba(255,255,255,.06);
  font-size: 14px;
  color: rgba(255,255,255,.78);
  line-height: 1.6;
}
.about-item:last-child { border-bottom: none; }
.about-item strong { color: #fff; }

.about-num { font-size: 12px; font-weight: 600; color: var(--accent); opacity: .7; flex-shrink: 0; margin-top: 2px; }

/* ===========================
   STICKY BAR
   =========================== */
.sticky-bar {
  position: sticky;
  bottom: 0;
  background: rgba(6,63,53,.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 14px var(--section-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid rgba(122,217,176,.15);
  z-index: 90;
}

.sticky-copy { font-size: 14px; color: rgba(255,255,255,.65); letter-spacing: -.1px; }
.sticky-copy strong { color: #fff; }

/* ===========================
   RESPONSIVE — Mobile
   =========================== */
@media (max-width: 768px) {
  :root {
    --section-v: 48px;
    --section-h: 20px;
  }

  /* Nav */
  .nav-links        { display: none; }
  .nav-action-desktop { display: none; }
  .nav-action-mobile  { display: block; }
  .nav-action { border: none; background: transparent; padding: 4px 8px; }

  /* Hero */
  .hero { padding: 48px var(--section-h) 0; }
  .hero-title { font-size: 34px; letter-spacing: -1px; }
  .hero-lead  { font-size: 16px; }
  .btn-primary { font-size: 15px; padding: 13px 24px; width: 100%; justify-content: center; }

  /* Outcomes — vertical list */
  .outcomes { grid-template-columns: 1fr; padding: 20px var(--section-h) 40px; }
  .outcome-card { display: flex; align-items: center; gap: 14px; padding: 14px 16px; }
  .oc-icon { margin-bottom: 0; flex-shrink: 0; width: 36px; height: 36px; }

  /* Worries — 2 cols */
  .worry-grid { grid-template-columns: repeat(2, 1fr); }

  /* Section titles */
  .section-h2  { font-size: 26px; }
  .section-lead { font-size: 15px; margin-bottom: 24px; }

  /* Steps — vertical */
  .steps { grid-template-columns: 1fr; border-radius: 16px; margin-top: 24px; }
  .step  { display: flex; gap: 16px; padding: 20px 18px; }
  .step-num { font-size: 24px; flex-shrink: 0; margin-bottom: 0; width: 32px; }

  /* Topics — 2 cols, show 4 */
  .topic-grid { grid-template-columns: repeat(2, 1fr); margin-top: 24px; }
  .topic-card:nth-child(n+5) { display: none; }
  /* 桌面端恢复全显 */

  /* About */
  .about-box { grid-template-columns: 1fr; padding: 28px 20px; gap: 24px; border-radius: 16px; }
  .about-quote { font-size: 20px; }

  /* Sticky */
  .sticky-copy { font-size: 12px; }
  .sticky-bar  { gap: 12px; }
}