/* 智数课官网 — brand blue from APP icon */

:root {
  --primary: #1a3096;
  --primary-deep: #14257a;
  --primary-ink: #121c4a;
  --secondary: #4a66c9;
  --accent: #c9a227;
  --accent-deep: #a6841c;
  --bg: #f5f7fc;
  --bg-soft: #eef1f9;
  --surface: #ffffff;
  --fg: #121c4a;
  --fg-soft: #243056;
  --muted: #5c6b85;
  --border: #c8d0e4;
  --border-soft: #dde3f0;
  --ring: #1a3096;
  --shadow: 0 8px 28px rgba(18, 28, 74, 0.1);
  --shadow-sm: 0 2px 10px rgba(18, 28, 74, 0.06);
  --radius: 14px;
  --radius-sm: 10px;
  --font-brand: "Lexend", "Noto Sans SC", sans-serif;
  --font-display: "Noto Serif SC", "Lexend", serif;
  --font-body: "Noto Sans SC", "Lexend", system-ui, sans-serif;
  --header-h: 72px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 220ms;
  --max: 1100px;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 72px;
  --space-7: 96px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--fg-soft);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  cursor: pointer;
}

:focus-visible {
  outline: 3px solid var(--ring);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  z-index: 100;
  padding: 10px 16px;
  background: var(--primary-deep);
  color: #fff;
  border-radius: 8px;
  font-weight: 600;
}

.skip-link:focus {
  left: 8px;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 60;
  height: 2px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  pointer-events: none;
  will-change: transform;
}

/* —— Header —— */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 0 clamp(20px, 4vw, 48px);
  background: rgba(245, 247, 252, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--border-soft);
  box-shadow: var(--shadow-sm);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  min-height: 44px;
}

.brand > span:last-child {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  overflow: hidden;
  flex-shrink: 0;
  background: var(--primary);
  box-shadow: 0 2px 8px rgba(26, 48, 150, 0.22);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur);
}

.brand-mark img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand-mark.small {
  width: 28px;
  height: 28px;
  border-radius: 7px;
}

.brand-mark.large {
  width: 96px;
  height: 96px;
  border-radius: 22px;
  box-shadow: var(--shadow);
}

.brand-name {
  font-family: var(--font-brand);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: 0.02em;
  color: var(--primary-ink);
}

.brand-en {
  display: block;
  margin-top: 2px;
  font-family: var(--font-brand);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.2vw, 26px);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--muted);
}

.nav a {
  position: relative;
  padding: 10px 2px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  transition: color var(--dur);
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--primary-ink);
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 8px;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}

.nav a:hover::after,
.nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  transition: background var(--dur), transform var(--dur);
}

.nav-cta:hover {
  background: var(--primary-deep);
}

.nav-cta-outline {
  background: transparent;
  color: var(--primary-ink);
  border: 1.5px solid var(--border);
}

.nav-cta-outline:hover {
  background: var(--surface);
  border-color: var(--primary);
}

/* —— Buttons —— */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 28px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 999px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: background var(--dur), color var(--dur), border-color var(--dur), box-shadow var(--dur), transform var(--dur) var(--ease);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 8px 20px rgba(26, 48, 150, 0.28);
  position: relative;
  overflow: hidden;
}

.btn-primary::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, transparent 30%, rgba(255, 255, 255, 0.28) 50%, transparent 70%);
  transform: translateX(-120%);
  pointer-events: none;
}

.btn-primary:hover::after {
  animation: btn-shine 0.7s var(--ease);
}

.btn-primary:hover {
  background: var(--primary-deep);
}

.btn-accent {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 20px rgba(201, 162, 39, 0.28);
}

.btn-accent:hover {
  background: var(--accent-deep);
}

.btn-ghost {
  background: var(--surface);
  color: var(--primary-ink);
  border-color: var(--border);
}

.btn-ghost:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

/* —— Hero (light LMS) —— */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border-soft);
}

.hero-wash {
  --mx: 0px;
  --my: 0px;
  position: absolute;
  inset: -6%;
  background:
    radial-gradient(ellipse 70% 55% at calc(85% + var(--mx)) calc(15% + var(--my)), rgba(74, 102, 201, 0.22), transparent 55%),
    radial-gradient(ellipse 55% 50% at calc(10% - var(--mx)) calc(90% - var(--my)), rgba(26, 48, 150, 0.14), transparent 50%),
    linear-gradient(180deg, #e8ecf8 0%, var(--bg) 70%);
  z-index: 0;
  animation: wash-drift 14s ease-in-out infinite alternate;
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(56px, 9vh, 100px) clamp(20px, 4vw, 48px);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(36px, 5vw, 64px);
  align-items: center;
}

.hero-kicker {
  margin: 0 0 14px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--primary);
}

.hero-brand {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3.2rem, 8vw, 5.6rem);
  line-height: 1.08;
  letter-spacing: 0.04em;
  color: var(--primary-ink);
}

.hero-lead {
  margin: 0 0 32px;
  max-width: 32em;
  font-size: clamp(1.05rem, 1.5vw, 1.18rem);
  line-height: 1.75;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-anim {
  opacity: 0;
  transform: translateY(18px);
}

.hero.is-ready .hero-anim {
  animation: rise 0.7s var(--ease) both;
  animation-delay: calc(var(--d, 0) * 90ms);
}

.path-board {
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: 20px;
  padding: 28px 26px;
  box-shadow: var(--shadow);
}

.hero.is-ready .path-board {
  animation: rise 0.75s var(--ease) both;
  animation-delay: 0.35s;
}

.path-board-label {
  margin: 0 0 18px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--primary);
}

.learn-path {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
  counter-reset: path;
}

.path-step {
  counter-increment: path;
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 14px;
  align-items: start;
  padding: 14px 10px;
  margin: 0 -10px;
  position: relative;
  border-radius: 10px;
  transition: background 0.35s var(--ease), transform 0.35s var(--ease);
}

.path-step.is-pulse {
  background: rgba(26, 48, 150, 0.05);
}

.path-step:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 27px;
  top: 42px;
  bottom: -2px;
  width: 2px;
  background: var(--border);
  transition: background 0.45s var(--ease);
}

.path-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: var(--font-brand);
  font-size: 0.8rem;
  font-weight: 700;
  background: var(--bg-soft);
  color: var(--muted);
  border: 2px solid var(--border);
  position: relative;
  z-index: 1;
}

.path-num::before {
  content: counter(path);
}

.path-step.is-done .path-num {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.path-step.is-active .path-num {
  background: #fff;
  border-color: var(--accent);
  color: var(--accent-deep);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, 0.18);
  animation: ring-pulse 2.2s ease-in-out infinite;
}

.path-step.is-active:not(:last-child)::after {
  background: linear-gradient(180deg, var(--accent), var(--border));
}

.path-step strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--primary-ink);
  margin-bottom: 2px;
}

.path-step span {
  font-size: 0.88rem;
  color: var(--muted);
}

.path-note {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px dashed var(--border);
  font-family: var(--font-brand);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--primary-deep);
  text-align: center;
  transition: letter-spacing 0.4s var(--ease), opacity 0.4s var(--ease);
}

.hero.is-ready .path-note {
  animation: note-glow 3.2s ease-in-out infinite;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes wash-drift {
  from {
    filter: saturate(1);
  }
  to {
    filter: saturate(1.08);
  }
}

@keyframes icon-float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px);
  }
}

@keyframes ring-pulse {
  0%,
  100% {
    box-shadow: 0 0 0 4px rgba(201, 162, 39, 0.16);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(201, 162, 39, 0.08);
  }
}

@keyframes note-glow {
  0%,
  100% {
    opacity: 0.85;
  }
  50% {
    opacity: 1;
    letter-spacing: 0.12em;
  }
}

@keyframes btn-shine {
  to {
    transform: translateX(120%);
  }
}

/* Trust strip — open row, no boxes */
.trust-strip {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px);
  transform: translateY(-12px);
}

.trust-strip ul {
  margin: 0;
  padding: 18px 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
  background: transparent;
}

.trust-strip li {
  background: transparent;
  padding: 4px 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.trust-strip strong {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--primary-ink);
}

.trust-strip span {
  font-size: 0.88rem;
  color: var(--muted);
}

/* Sections */
.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(56px, 9vh, 88px) clamp(20px, 4vw, 48px);
}

.section-head {
  max-width: 38em;
  margin-bottom: clamp(32px, 5vw, 48px);
}

.eyebrow {
  margin: 0 0 12px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--primary);
}

.section h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1.35;
  color: var(--primary-ink);
}

.section-lead {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--muted);
}

.section-lead strong {
  color: var(--fg);
  font-weight: 600;
}

.card-kicker {
  margin: 0 0 8px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--primary);
}

/* Intro — editorial split, no cards */
.feature-flow {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 4vw, 48px);
  padding-bottom: var(--space-5);
  margin-bottom: var(--space-5);
  border-bottom: 1px solid var(--border-soft);
}

.flow-lead h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.2vw, 1.65rem);
  color: var(--primary-ink);
}

.flow-lead p:last-child {
  margin: 0;
  font-size: 1rem;
  color: var(--muted);
  line-height: 1.75;
  max-width: 28em;
}

.flow-lead.amber .card-kicker {
  color: var(--accent);
}

.feature-base {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 4vw, 48px);
}

.feature-base h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--primary-ink);
}

.feature-base p:last-child {
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.7;
}

/* Diff — open columns, divider only */
.diff {
  background: transparent;
  max-width: none;
  padding-left: max(clamp(20px, 4vw, 48px), calc((100% - var(--max)) / 2 + clamp(20px, 4vw, 48px)));
  padding-right: max(clamp(20px, 4vw, 48px), calc((100% - var(--max)) / 2 + clamp(20px, 4vw, 48px)));
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
}

.diff .section-head,
.diff .diff-table {
  max-width: var(--max);
  margin-left: auto;
  margin-right: auto;
}

.diff-table {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.diff-col {
  padding: 8px clamp(20px, 3vw, 40px) 8px 0;
  background: transparent;
  border: none;
  border-radius: 0;
}

.diff-col + .diff-col {
  padding-left: clamp(20px, 3vw, 40px);
  padding-right: 0;
  border-left: 1px solid var(--border-soft);
}

.diff-col.companion-col {
  background: transparent;
  border-color: var(--border-soft);
}

.diff-col.companion-col .card-kicker {
  color: var(--accent);
}

.diff-col h3 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--primary-ink);
}

.diff-col ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.diff-col li {
  position: relative;
  padding: 0 0 12px 16px;
  color: var(--fg-soft);
  font-size: 0.95rem;
}

.diff-col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 1.5px;
  border-radius: 0;
  background: var(--primary);
}

.companion-col li::before {
  background: var(--accent);
}

/* AI — stacked rows, not cards */
.ai-band {
  max-width: none;
  padding-left: max(clamp(20px, 4vw, 48px), calc((100% - var(--max)) / 2 + clamp(20px, 4vw, 48px)));
  padding-right: max(clamp(20px, 4vw, 48px), calc((100% - var(--max)) / 2 + clamp(20px, 4vw, 48px)));
  background: transparent;
}

.ai-band .section-head,
.ai-band .ai-list {
  max-width: var(--max);
  margin-left: auto;
  margin-right: auto;
}

.ai-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border-soft);
}

.ai-row {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 20px;
  align-items: start;
  padding: 22px 0;
  border-bottom: 1px solid var(--border-soft);
  background: transparent;
  transition: background var(--dur), transform var(--dur) var(--ease);
}

.ai-row:hover {
  background: rgba(26, 48, 150, 0.04);
  transform: translateX(4px);
}

.ai-row.accent {
  background: transparent;
  border-bottom: none;
  margin-top: 8px;
  padding: 28px 0 8px;
}

.ai-row.accent .ai-tag {
  color: var(--accent);
}

.ai-row.accent h3 {
  color: var(--primary-deep);
}

.ai-tag {
  margin: 4px 0 0;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--primary);
}

.ai-body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--primary-ink);
}

.ai-body p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--muted);
  max-width: 40em;
}

/* Companion */
.companion {
  max-width: none;
  padding-left: max(clamp(20px, 4vw, 48px), calc((100% - var(--max)) / 2 + clamp(20px, 4vw, 48px)));
  padding-right: max(clamp(20px, 4vw, 48px), calc((100% - var(--max)) / 2 + clamp(20px, 4vw, 48px)));
  background: transparent;
  border-top: 1px solid var(--border-soft);
}

.companion-layout {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(36px, 5vw, 64px);
  align-items: start;
}

.companion .section-head {
  margin-bottom: 0;
  position: sticky;
  top: calc(var(--header-h) + 20px);
}

.companion-points {
  margin: 0;
  padding: 0;
  list-style: none;
}

.companion-points li {
  display: grid;
  gap: 6px;
  padding: 22px 0;
  border-bottom: 1px solid var(--border-soft);
}

.companion-points li:first-child {
  padding-top: 0;
}

.companion-points strong {
  font-family: var(--font-display);
  font-size: 1.08rem;
  color: var(--primary-ink);
}

.companion-points span {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.7;
}

/* Platforms — text columns */
.plat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin: 0;
  padding: 8px 0;
  list-style: none;
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
}

.plat-row li {
  padding: 24px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: transparent;
  border: none;
  border-radius: 0;
}

.plat-row li + li {
  padding-left: clamp(16px, 2vw, 28px);
  margin-left: clamp(16px, 2vw, 28px);
  border-left: 1px solid var(--border-soft);
}

.plat-row strong {
  font-family: var(--font-display);
  font-size: 1.12rem;
  color: var(--primary-ink);
}

.plat-row span {
  font-size: 0.9rem;
  color: var(--muted);
}

/* Download icon showcase */
.download-icon {
  display: flex;
  justify-content: center;
  margin-bottom: 28px;
}

.download-icon .brand-mark {
  width: 88px;
  height: 88px;
  border-radius: 20px;
}

.hero-brand-row {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 20px;
}

.hero-brand-row .hero-brand {
  margin: 0;
}

.hero-icon {
  width: 88px;
  height: 88px;
  border-radius: 20px;
  overflow: hidden;
  flex-shrink: 0;
  box-shadow: var(--shadow);
  background: var(--primary);
}

.hero.is-ready .hero-icon {
  animation: icon-float 4.5s ease-in-out 0.8s infinite;
}

.hero-icon img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand:hover .brand-mark {
  transform: scale(1.05) rotate(-2deg);
}

.flow-lead:hover h3,
.feature-base > div:hover h3,
.companion-points li:hover strong {
  color: var(--primary);
}

.trust-strip li {
  transition: transform var(--dur) var(--ease);
}

.trust-strip li:hover {
  transform: translateY(-2px);
}

@media (max-width: 640px) {
  .hero-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
  }
}

/* Download / CTA */
.download-band {
  background: var(--bg-soft);
  max-width: none;
  text-align: center;
  padding-left: clamp(20px, 4vw, 48px);
  padding-right: clamp(20px, 4vw, 48px);
}

.download-band .section-head {
  margin-left: auto;
  margin-right: auto;
}

.download-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}

.cta-band {
  max-width: none;
  text-align: center;
  padding: clamp(72px, 12vh, 112px) clamp(20px, 4vw, 48px);
  background:
    linear-gradient(145deg, #121c4a 0%, #1a3096 48%, #243d9e 100%);
  color: rgba(255, 255, 255, 0.82);
}

.cta-band h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  line-height: 1.35;
  color: #fff;
}

.cta-band p {
  margin: 0 0 28px;
  font-size: 1.05rem;
}

.cta-band .btn-primary {
  background: #fff;
  color: var(--primary-deep);
  box-shadow: none;
}

.cta-band .btn-primary:hover {
  background: #f5f7fc;
}

.cta-band .btn-ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.4);
}

.cta-band .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #fff;
}

/* Footer */
.site-footer {
  padding: 40px clamp(20px, 4vw, 48px) 48px;
  text-align: center;
  border-top: 1px solid var(--border-soft);
  background: var(--bg);
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  font-family: var(--font-brand);
  font-weight: 700;
  color: var(--primary-ink);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin: 16px 0 0;
}

.footer-links a {
  color: var(--fg-soft);
  font-weight: 500;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.footer-links a:hover {
  color: var(--primary);
}

/* app.html */
.page-hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(48px, 8vh, 80px) clamp(20px, 4vw, 48px) 32px;
}

.page-hero h1 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3.5vw, 2.6rem);
  color: var(--primary-ink);
}

.glow {
  display: none;
}

.hero-pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.hero-pill {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 8px 14px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--fg-soft);
  border-radius: 999px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.feature-card {
  padding: 28px 24px;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
}

.feature-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--primary-ink);
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.feature-card.wide {
  grid-column: 1 / -1;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.app-detail {
  display: grid;
  gap: 16px;
  padding-top: 16px;
}

.detail-block {
  padding: 28px 26px;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
}

.detail-block.featured {
  background: linear-gradient(165deg, #e8ecf8, var(--surface) 60%);
  border-color: rgba(26, 48, 150, 0.22);
}

.detail-block.featured:nth-of-type(2) {
  background: linear-gradient(165deg, #faf6e8, var(--surface) 60%);
  border-color: rgba(201, 162, 39, 0.28);
}

.detail-tag {
  margin: 0 0 8px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--primary);
}

.detail-block.featured:nth-of-type(2) .detail-tag {
  color: var(--accent);
}

.detail-block h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--primary-ink);
}

.detail-block p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.75;
}

.how-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: how;
  display: grid;
  gap: 12px;
}

.how-list li {
  counter-increment: how;
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 8px 16px;
  padding: 22px 24px;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
}

.how-list li::before {
  content: counter(how, decimal-leading-zero);
  font-family: var(--font-brand);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  grid-row: 1 / span 2;
  align-self: start;
  line-height: 1.2;
}

.how-list strong {
  font-family: var(--font-display);
  font-size: 1.08rem;
  color: var(--primary-ink);
}

.how-list span {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.7;
}

.hero-actions.center {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.45s var(--ease), transform 0.45s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal,
  .hero-anim {
    opacity: 1;
    transform: none;
  }

  .hero-wash {
    inset: 0;
    animation: none;
  }

  .scroll-progress {
    display: none;
  }
}

/* Responsive */
@media (max-width: 960px) {
  .nav {
    display: none;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .feature-flow,
  .feature-base,
  .diff-table {
    grid-template-columns: 1fr;
  }

  .diff-col + .diff-col {
    padding-left: 0;
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-left: none;
    border-top: 1px solid var(--border-soft);
  }

  .ai-row {
    grid-template-columns: 72px 1fr;
  }

  .companion-layout {
    grid-template-columns: 1fr;
  }

  .companion .section-head {
    position: static;
  }
}

@media (max-width: 640px) {
  .trust-strip {
    transform: none;
    margin-top: var(--space-3);
  }

  .trust-strip ul,
  .plat-row {
    grid-template-columns: 1fr;
  }

  .plat-row li + li {
    margin-left: 0;
    padding-left: 0;
    border-left: none;
    border-top: 1px solid var(--border-soft);
  }

  .ai-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .nav-cta-outline {
    display: none;
  }
}