/* DISP-VIS-003 · SignalForge 营销首页 · 只出设计稿，非施工令 */
:root {
  --navy: #0B1F33;
  --navy-2: #07151F;
  --ink: #0B1F33;
  --teal: #2F6F8F;
  --paper: #F3EFE8;
  --paper-2: #E7E2D8;
  --ivory: #F7F4EE;
  --white: #FFFcf7;
  --muted: #5A6570;
  --muted-on-dark: #C5D0D8;
  --line: #D5D0C6;
  --line-dark: rgba(247, 244, 238, 0.12);
  --gold: #C5A572;
  --gold-ink: #8A6A3B;
  --serif-cn: "Noto Serif CJK SC", "Source Han Serif SC", serif;
  --serif-en: "Instrument Serif", "Newsreader", "Source Serif Pro", serif;
  --sans-cn: "Noto Sans CJK SC", "Noto Sans SC", sans-serif;
  --sans-en: "Instrument Sans", "Source Sans 3", "Inter", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; background: var(--navy-2); }
body {
  width: 1440px;
  margin: 0 auto;
  color: var(--ink);
  background: var(--navy-2);
  font-family: var(--sans-en), var(--sans-cn);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  height: 72px;
  padding: 0 40px 0 48px;
  background: var(--navy-2);
  border-bottom: 1px solid var(--line-dark);
}
.nav__brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.nav__mark {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(197, 165, 114, 0.18);
}
.nav__name {
  font-family: var(--serif-en);
  font-size: 22px;
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--ivory);
}
.nav__links {
  margin-left: auto;
  display: flex;
  gap: 28px;
  font-size: 13px;
  color: var(--muted-on-dark);
  font-family: var(--sans-cn);
}
.nav__links a { color: inherit; text-decoration: none; }
.nav__links a:hover { color: var(--ivory); }
.nav__cta { display: flex; gap: 10px; margin-left: 28px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 34px;
  padding: 0 14px;
  border-radius: 2px;
  font-family: var(--sans-cn);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
}
.btn--lg { height: 44px; padding: 0 22px; font-size: 14.5px; }
.btn--ghost {
  border: 1px solid rgba(247, 244, 238, 0.35);
  color: var(--ivory);
  background: transparent;
}
.btn--solid-light {
  background: var(--ivory);
  color: var(--navy);
  border: 1px solid var(--ivory);
}
.btn--outline {
  border: 1px solid var(--ink);
  color: var(--ink);
  background: transparent;
  height: 40px;
  padding: 0 16px;
}
.btn--ghost-ink {
  border: 1px solid rgba(11, 31, 51, 0.28);
  color: var(--navy);
  background: transparent;
  height: 40px;
  padding: 0 16px;
}

/* ========== HERO ========== */
.hero {
  position: relative;
  width: 1440px;
  height: 828px;
  background: var(--navy-2);
  color: var(--ivory);
  overflow: hidden;
}
.hero__wm {
  position: absolute;
  right: 5%;
  bottom: 20%;
  transform: rotate(-14deg);
  font-family: var(--serif-en);
  font-size: 32px;
  letter-spacing: 0.14em;
  color: rgba(247, 244, 238, 0.09);
  pointer-events: none;
  white-space: nowrap;
  z-index: 2;
}
.hero__stage {
  position: relative;
  z-index: 3;
  display: grid;
  grid-template-columns: 1fr 1.08fr;
  height: 748px;
  padding: 0 0 0 48px;
}
.hero__copy {
  padding-top: 72px;
  padding-right: 40px;
  max-width: 600px;
}
.kicker {
  font-family: var(--sans-en);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 18px;
}
.kicker--ink { color: var(--gold-ink); }
.hero__copy h1 {
  font-family: var(--serif-cn);
  font-weight: 600;
  font-size: 46px;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--ivory);
  margin: 0 0 22px;
  max-width: 11.2em;
}
.lead {
  font-family: var(--sans-cn);
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted-on-dark);
  max-width: 28em;
  margin-bottom: 32px;
}
.nowrap { white-space: nowrap; }
.hero__actions {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 22px;
}
.hero__aside {
  font-family: var(--sans-cn);
  font-size: 12.5px;
  color: rgba(197, 208, 216, 0.78);
  letter-spacing: 0.02em;
}
.hero__aside a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid rgba(197, 208, 216, 0.35);
  padding-bottom: 1px;
}
.hero__aside a:hover { color: var(--ivory); border-bottom-color: var(--ivory); }
.hero__visual {
  position: relative;
  overflow: hidden;
  padding: 0;
}
.hero__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center right;
  display: block;
  border: 0;
  box-shadow: none;
}
.hero__index {
  position: relative;
  z-index: 3;
  height: 80px;
  margin: 0 40px 0 48px;
  border-top: 1px solid var(--line-dark);
  display: flex;
  align-items: center;
  gap: 18px;
  font-family: var(--sans-cn);
  font-size: 13.5px;
  color: var(--ivory);
  scroll-margin-top: 72px;
}
.hero__index-label {
  color: var(--gold);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-right: 8px;
  font-family: var(--sans-en), var(--sans-cn);
}
.hero__index i {
  width: 1px;
  height: 12px;
  background: rgba(247, 244, 238, 0.22);
  display: inline-block;
}

/* ========== PATHS + STEPS (paper) ========== */
.band {
  width: 1440px;
  background: var(--paper);
  color: var(--ink);
  padding: 72px 72px 28px;
}
.band--tight { padding-top: 8px; padding-bottom: 80px; }
.paths {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 72px;
  scroll-margin-top: 88px;
}
.path { padding-bottom: 8px; }
.path + .path {
  border-left: 1px solid var(--line);
  padding-left: 72px;
}
.path h2 {
  font-family: var(--serif-cn);
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin: 0 0 12px;
}
.path p {
  font-family: var(--sans-cn);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 28em;
  margin-bottom: 22px;
}
.path .btn { margin-right: 10px; }

.steps { margin-top: 64px; }
.steps__head { margin-bottom: 28px; max-width: 640px; }
.steps__head h2 {
  font-family: var(--serif-cn);
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}
.steps__head p {
  font-family: var(--sans-cn);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}
.steps__row {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}
.step {
  display: grid;
  grid-template-columns: 56px 200px 1fr;
  gap: 12px 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.step__n {
  font-family: var(--serif-en);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold-ink);
  margin: 0;
}
.step h3 {
  font-family: var(--serif-cn);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
  line-height: 1.35;
}
.step p {
  font-family: var(--sans-cn);
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
  margin: 0;
}
.step p br { display: none; }

/* ========== PRICING ========== */
.pricing {
  width: 1440px;
  background: var(--paper);
  padding: 24px 72px 80px;
  scroll-margin-top: 72px;
}
.pricing__intro { max-width: 760px; margin-bottom: 40px; }
.pricing h2 {
  font-family: var(--serif-cn);
  font-size: 32px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
}
.pricing__lead {
  font-family: var(--sans-cn);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 46em;
}
.pricing__grid {
  display: grid;
  grid-template-columns: 1fr 1.28fr 1fr;
  gap: 20px;
  align-items: stretch;
}
.plan {
  background: var(--ivory);
  padding: 28px 26px 26px;
  display: flex;
  flex-direction: column;
  min-height: 360px;
}
.plan--side {
  margin-top: 36px;
  min-height: 0;
  background: transparent;
  box-shadow: none;
  border-top: 1px solid #C9C2B6;
  padding: 24px 8px 8px 0;
}
.plan--featured {
  background: var(--navy);
  color: var(--ivory);
  padding: 36px 32px 32px;
  min-height: 400px;
  box-shadow: 0 16px 36px rgba(11, 31, 51, 0.18);
  margin-top: 0;
}
.plan__tag {
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold-ink);
  margin-bottom: 10px;
  font-family: var(--sans-en);
}
.plan__tag--on { color: var(--gold); }
.plan h3 {
  font-family: var(--serif-en);
  font-size: 22px;
  font-weight: 400;
  margin-bottom: 8px;
}
.plan--featured h3 { font-size: 26px; }
.plan__price {
  font-family: var(--serif-en);
  font-size: 40px;
  letter-spacing: -0.03em;
  line-height: 1;
  margin: 0 0 10px;
}
.plan--featured .plan__price { font-size: 58px; color: var(--ivory); }
.plan__meta {
  font-family: var(--sans-cn);
  font-size: 12.5px;
  color: var(--muted);
  margin-bottom: 18px;
}
.plan--featured .plan__meta { color: var(--muted-on-dark); }
.plan ul {
  list-style: none;
  font-family: var(--sans-cn);
  font-size: 13.5px;
  line-height: 1.65;
  color: #3A434A;
  margin-bottom: auto;
  padding-bottom: 22px;
}
.plan--featured ul { color: var(--muted-on-dark); }
.plan li + li { margin-top: 4px; }
.plan .btn { align-self: flex-start; }
.plan--featured .btn--solid-light { margin-top: 8px; }
.pricing__addon {
  margin-top: 28px;
  font-family: var(--sans-cn);
  font-size: 13px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 16px;
  max-width: 52em;
}
.pricing__addon strong { color: var(--ink); font-weight: 650; }

/* ========== RED LINES ========== */
.rules {
  width: 1440px;
  background: var(--navy);
  color: var(--ivory);
  padding: 72px 72px 80px;
  scroll-margin-top: 72px;
}
.rules__intro { max-width: 640px; margin-bottom: 36px; }
.rules h2 {
  font-family: var(--serif-cn);
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 10px;
}
.rules__lead {
  font-family: var(--sans-cn);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted-on-dark);
}
.rules ol {
  list-style: none;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-dark);
}
.rules li {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-dark);
  font-family: var(--sans-cn);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ivory);
}
.rules li span {
  font-family: var(--serif-en);
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--gold);
  padding-top: 2px;
}

/* ========== FOOTER ========== */
.site-foot {
  width: 1440px;
  background: var(--navy-2);
  color: var(--muted-on-dark);
  padding: 48px 72px 56px;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  scroll-margin-top: 72px;
  border-top: 1px solid var(--line-dark);
}
.site-foot__brand {
  font-family: var(--serif-en);
  font-size: 22px;
  color: var(--ivory);
  margin-bottom: 10px;
}
.site-foot p, .site-foot li {
  font-family: var(--sans-cn);
  font-size: 13px;
  line-height: 1.7;
}
.site-foot a {
  color: var(--ivory);
  text-decoration: none;
  border-bottom: 1px solid rgba(247, 244, 238, 0.3);
}
.site-foot__meta { margin-top: 18px; color: rgba(197, 208, 216, 0.7); }
.site-foot__cta { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }

.site-foot a.btn { border-bottom: none; }
.site-foot .btn--solid-light { color: var(--navy); background: var(--ivory); }
.site-foot .btn--ghost { color: var(--ivory); }