/* 棱镜 Lens Landing Page — Light / Dark themes */

:root {
  --gold: var(--lens-brand-primary);
  --gold-bright: var(--lens-brand-primary-muted);
  --teal: var(--lens-ai-accent);
  --teal-bright: var(--lens-color-ai-300);
  --violet: var(--lens-color-primary-500);
  --blue: var(--lens-status-info);
  --rose: var(--lens-status-danger);
  --green: var(--lens-status-success);
  --amber: var(--lens-status-warning);
  --radius: 16px;
  --radius-lg: 24px;
  --font: "Inter", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  /* 内容区限宽（行业常见 1140–1280）；背景/光晕仍全视口 */
  --content-max: 1280px;
  --gutter: clamp(20px, 4vw, 48px);
  --prose-max: 36rem;
  --hero-mock-max: 520px;
  --nav-h: 72px;
  --gradient-text: var(--lens-gradient-brand);
  --btn-primary-bg: var(--lens-gradient-primary-button);
  --btn-primary-text: #ffffff;
  --btn-primary-shadow: var(--lens-shadow-primary);
  --btn-primary-shadow-hover: var(--lens-shadow-primary-hover);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: var(--lens-surface-page);
  --bg-elevated: var(--lens-surface-elevated);
  --bg-card: var(--lens-surface-card);
  --bg-subtle: var(--lens-surface-subtle);
  --bg-badge: rgba(255, 255, 255, 0.04);
  --bg-outline: var(--lens-surface-outline);
  --border: var(--lens-border-subtle);
  --border-strong: var(--lens-border-strong);
  --text: var(--lens-text-primary);
  --text-muted: var(--lens-text-secondary);
  --text-dim: var(--lens-text-tertiary);
  --gold-accent: var(--lens-color-primary-300);
  --nav-bg: var(--lens-nav-bg);
  --nav-bg-scrolled: var(--lens-nav-bg-scrolled);
  --nav-mobile-bg: var(--lens-nav-mobile-bg);
  --glow-gold: color-mix(in srgb, var(--lens-brand-primary) 16%, transparent);
  --glow-teal: color-mix(in srgb, var(--lens-ai-accent) 10%, transparent);
  --shadow: var(--lens-shadow-card);
  --shadow-hover: var(--lens-shadow-card-hover);
  --section-alt-bg: rgba(255, 255, 255, 0.02);
  --highlight-bg: linear-gradient(145deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));
  --cta-border: rgba(129, 140, 248, 0.26);
  --cta-bg: linear-gradient(135deg, rgba(99, 102, 241, 0.16), rgba(14, 165, 233, 0.08));
  --code-bg: rgba(255, 255, 255, 0.06);
  --code-color: var(--lens-color-primary-200);
  --chip-bg: var(--lens-surface-muted);
  --workflow-num: color-mix(in srgb, var(--lens-color-primary-400) 38%, transparent);
  --workflow-hover-border: color-mix(in srgb, var(--lens-color-primary-400) 38%, transparent);
  --verify-pass-bg: color-mix(in srgb, var(--lens-color-success-500) 10%, transparent);
  --verify-pass-border: color-mix(in srgb, var(--lens-color-success-500) 25%, transparent);
  --verify-pass-icon-bg: color-mix(in srgb, var(--lens-color-success-500) 20%, transparent);
  --verify-warn-bg: color-mix(in srgb, var(--lens-color-danger-500) 8%, transparent);
  --verify-warn-border: color-mix(in srgb, var(--lens-color-danger-500) 20%, transparent);
  --verify-stream-bg: color-mix(in srgb, var(--lens-color-ai-300) 6%, transparent);
  --verify-stream-border: color-mix(in srgb, var(--lens-color-ai-300) 25%, transparent);
  --icon-gold-bg: color-mix(in srgb, var(--lens-color-primary-400) 15%, transparent);
  --icon-teal-bg: color-mix(in srgb, var(--lens-ai-accent) 12%, transparent);
  --icon-violet-bg: color-mix(in srgb, var(--lens-color-primary-500) 12%, transparent);
  --icon-blue-bg: rgba(96, 165, 250, 0.12);
  --icon-rose-bg: rgba(251, 113, 133, 0.12);
  --icon-amber-bg: rgba(251, 191, 36, 0.12);
  --teal-display: var(--teal-bright);
  --green-display: var(--lens-color-success-500);
  --rose-display: var(--lens-color-danger-500);
  --gradient-text: linear-gradient(
    135deg,
    var(--lens-color-primary-200) 0%,
    var(--lens-color-primary-400) 50%,
    var(--lens-color-ai-300) 100%
  );
}

[data-theme="light"] {
  color-scheme: light;
  --bg: var(--lens-surface-page);
  --bg-elevated: var(--lens-surface-elevated);
  --bg-card: var(--lens-surface-card);
  --bg-subtle: var(--lens-surface-subtle);
  --bg-badge: rgba(255, 255, 255, 0.9);
  --bg-outline: var(--lens-surface-outline);
  --border: var(--lens-border-subtle);
  --border-strong: var(--lens-border-strong);
  --text: var(--lens-text-primary);
  --text-muted: var(--lens-text-secondary);
  --text-dim: var(--lens-text-tertiary);
  --gold-accent: var(--lens-brand-primary);
  --nav-bg: var(--lens-nav-bg);
  --nav-bg-scrolled: var(--lens-nav-bg-scrolled);
  --nav-mobile-bg: var(--lens-nav-mobile-bg);
  --glow-gold: color-mix(in srgb, var(--lens-brand-primary) 12%, transparent);
  --glow-teal: color-mix(in srgb, var(--lens-ai-accent) 8%, transparent);
  --shadow: var(--lens-shadow-card);
  --shadow-hover: var(--lens-shadow-card-hover);
  --section-alt-bg: rgba(15, 23, 42, 0.025);
  --highlight-bg: linear-gradient(145deg, rgba(255, 255, 255, 0.95), rgba(248, 250, 252, 0.85));
  --cta-border: rgba(79, 70, 229, 0.24);
  --cta-bg: linear-gradient(135deg, rgba(238, 242, 255, 0.9), rgba(224, 242, 254, 0.72));
  --code-bg: color-mix(in srgb, var(--lens-brand-primary) 8%, transparent);
  --code-color: var(--lens-brand-primary-hover);
  --chip-bg: var(--lens-surface-muted);
  --workflow-num: color-mix(in srgb, var(--lens-brand-primary) 36%, transparent);
  --workflow-hover-border: color-mix(in srgb, var(--lens-brand-primary) 32%, transparent);
  --verify-pass-bg: color-mix(in srgb, var(--lens-status-success) 8%, transparent);
  --verify-pass-border: color-mix(in srgb, var(--lens-status-success) 22%, transparent);
  --verify-pass-icon-bg: color-mix(in srgb, var(--lens-status-success) 14%, transparent);
  --verify-warn-bg: color-mix(in srgb, var(--lens-status-danger) 6%, transparent);
  --verify-warn-border: color-mix(in srgb, var(--lens-status-danger) 18%, transparent);
  --verify-stream-bg: color-mix(in srgb, var(--lens-ai-accent) 6%, transparent);
  --verify-stream-border: color-mix(in srgb, var(--lens-ai-accent) 22%, transparent);
  --icon-gold-bg: color-mix(in srgb, var(--lens-brand-primary) 10%, transparent);
  --icon-teal-bg: color-mix(in srgb, var(--lens-ai-accent) 9%, transparent);
  --icon-violet-bg: color-mix(in srgb, var(--lens-color-primary-500) 10%, transparent);
  --icon-blue-bg: rgba(37, 99, 235, 0.1);
  --icon-rose-bg: rgba(225, 29, 72, 0.08);
  --icon-amber-bg: rgba(217, 119, 6, 0.1);
  --teal-display: var(--teal);
  --green-display: var(--green);
  --rose-display: var(--rose);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background 0.35s ease, color 0.35s ease;
}

.container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

code {
  font-size: 0.85em;
  padding: 0.15em 0.45em;
  border-radius: 6px;
  background: var(--code-bg);
  color: var(--code-color);
}

/* Background */
.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
}

.bg-glow--gold {
  width: 520px;
  height: 520px;
  top: -120px;
  right: -80px;
  background: var(--glow-gold);
}

.bg-glow--teal {
  width: 420px;
  height: 420px;
  bottom: 20%;
  left: -100px;
  background: var(--glow-teal);
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--border);
  transition: background 0.25s ease;
}

.nav__inner {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: var(--nav-h);
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.nav__logo-img {
  width: 40px;
  height: 40px;
  display: block;
  object-fit: contain;
  border-radius: 10px;
}

.nav__titles {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.nav__name-zh {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}

.nav__name-en {
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav__drawer {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-left: auto;
}

.nav__links {
  display: flex;
  gap: 28px;
}

.nav__links a {
  font-size: 0.92rem;
  color: var(--text-muted);
  transition: color 0.2s;
}

.nav__links a:hover {
  color: var(--text);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-badge);
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s, transform 0.15s;
}

.theme-toggle:hover {
  color: var(--text);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.theme-toggle__icon {
  width: 18px;
  height: 18px;
}

.theme-toggle__icon--sun {
  display: none;
}

.theme-toggle__icon--moon {
  display: block;
}

[data-theme="light"] .theme-toggle__icon--sun {
  display: block;
}

[data-theme="light"] .theme-toggle__icon--moon {
  display: none;
}

[data-theme="light"] .theme-toggle {
  color: var(--gold);
}

.nav__menu {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  min-width: 44px;
  min-height: 44px;
  padding: 10px;
  margin: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.nav__menu span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s, background 0.2s;
  white-space: nowrap;
}

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

.btn--primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  box-shadow: var(--btn-primary-shadow);
}

.btn--primary:hover {
  box-shadow: var(--btn-primary-shadow-hover);
}

.btn--ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: var(--border);
}

.btn--ghost:hover {
  color: var(--text);
  border-color: var(--border-strong);
}

.btn--outline {
  background: var(--bg-outline);
  border-color: var(--border-strong);
  color: var(--text);
}

.btn--lg {
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
}

/* Hero */
.hero {
  position: relative;
  z-index: 1;
  padding: 72px 0 96px;
}

.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
  align-items: center;
}

.hero__content {
  min-width: 0;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.35rem 0.85rem 0.35rem 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-badge);
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--teal-display);
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--teal-display) 60%, transparent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--teal-display) 50%, transparent); }
  70% { box-shadow: 0 0 0 10px color-mix(in srgb, var(--teal-display) 0%, transparent); }
  100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--teal-display) 0%, transparent); }
}

.hero__title {
  font-size: clamp(2.4rem, 4.5vw, 3.5rem);
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin: 0 0 20px;
}

.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: var(--prose-max);
  margin: 0 0 28px;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
  max-width: 100%;
}

.hero__stats div {
  padding: 14px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-subtle);
}

.hero__stats dt {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--gold-accent);
  margin: 0 0 4px;
}

.hero__stats dd {
  margin: 0;
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* Dashboard mock — 限宽避免大屏拉伸 */
.hero__visual {
  position: relative;
  min-height: 420px;
  width: 100%;
  max-width: var(--hero-mock-max);
  justify-self: end;
  margin-inline-start: auto;
  min-width: 0;
}

.dashboard-card {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-strong);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
}

.dashboard-card--main {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--hero-mock-max);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.dashboard-card__header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot--red { background: var(--lens-color-danger-500); }
.dot--yellow { background: var(--lens-color-warning-500); }
.dot--green { background: var(--lens-color-success-500); }

.dashboard-card__title {
  margin-left: 8px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.dashboard-card__body {
  padding: 18px;
}

.verify-summary {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 12px 14px;
  border-radius: 12px;
  margin-bottom: 14px;
}

.verify-summary--pass {
  background: var(--verify-pass-bg);
  border: 1px solid var(--verify-pass-border);
}

.verify-summary__icon {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--verify-pass-icon-bg);
  color: var(--green-display);
  font-weight: 700;
}

.verify-summary strong {
  display: block;
  font-size: 0.9rem;
}

.verify-summary span {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.verify-items {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.verify-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 0.82rem;
  border: 1px solid var(--border);
}

.verify-item > span {
  min-width: 0;
  line-height: 1.45;
}

.verify-item em {
  font-style: normal;
  font-size: 0.72rem;
  font-weight: 600;
  flex-shrink: 0;
  text-align: right;
  max-width: 42%;
}

.verify-item--ok em { color: var(--green-display); }
.verify-item--warn {
  background: var(--verify-warn-bg);
  border-color: var(--verify-warn-border);
}
.verify-item--warn em { color: var(--rose-display); }

.verify-stream {
  padding: 12px;
  border-radius: 10px;
  background: var(--verify-stream-bg);
  border: 1px dashed var(--verify-stream-border);
}

.verify-stream__label {
  display: block;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--teal-display);
  margin-bottom: 6px;
}

.verify-stream p {
  margin: 0;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.dashboard-card--float {
  position: absolute;
  padding: 14px 16px;
  z-index: 3;
  animation: float 5s ease-in-out infinite;
}

.dashboard-card--float strong {
  display: block;
  font-size: 0.82rem;
  margin-bottom: 4px;
}

.dashboard-card--float p {
  margin: 0;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.dashboard-card--policy {
  top: -16px;
  right: -12px;
  animation-delay: -1s;
}

.dashboard-card--rag {
  bottom: 24px;
  left: -24px;
  animation-delay: -2.5s;
}

/* Sections */
.section {
  position: relative;
  z-index: 1;
  padding: 88px 0;
}

.section--alt {
  background: var(--section-alt-bg);
  border-block: 1px solid var(--border);
}

.section__header {
  text-align: center;
  max-width: min(40rem, 100%);
  margin: 0 auto 52px;
}

.section__header--left {
  text-align: left;
  margin-inline: 0;
}

.section__eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold-accent);
  margin: 0 0 10px;
  font-weight: 600;
}

.section__header h2 {
  font-size: clamp(1.75rem, 3vw, 2.35rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
}

.section__header p {
  margin: 0;
  color: var(--text-muted);
}

/* Capability grid */
.cap-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.cap-card {
  padding: 28px 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}

.cap-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-hover);
}

.cap-card__icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  margin-bottom: 18px;
}

.cap-card__icon svg {
  width: 24px;
  height: 24px;
}

.cap-card__icon--gold { background: var(--icon-gold-bg); color: var(--gold-accent); }
.cap-card__icon--teal { background: var(--icon-teal-bg); color: var(--teal-display); }
.cap-card__icon--violet { background: var(--icon-violet-bg); color: var(--violet); }
.cap-card__icon--blue { background: var(--icon-blue-bg); color: var(--blue); }
.cap-card__icon--rose { background: var(--icon-rose-bg); color: var(--rose-display); }
.cap-card__icon--amber { background: var(--icon-amber-bg); color: var(--amber); }

.cap-card h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
}

.cap-card p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* Workflow */
.workflow {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 48px;
  align-items: start;
}

.workflow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.workflow-step {
  display: flex;
  gap: 20px;
  padding: 22px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  transition: border-color 0.2s;
}

.workflow-step:hover {
  border-color: var(--workflow-hover-border);
}

.workflow-step__num {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--workflow-num);
  line-height: 1;
  flex-shrink: 0;
}

.workflow-step h3 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.workflow-step p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* Highlights */
.highlight-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.highlight-card {
  padding: 28px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--highlight-bg);
}

.highlight-card h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  color: var(--gold-accent);
}

.highlight-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.metric-value {
  font-size: clamp(1.15rem, 2.2vw, 1.4rem);
  font-weight: 700;
  color: var(--text);
  margin: 0 0 10px;
}

/* Architecture */
.arch__layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: start;
}

.arch-diagram {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.arch-layer {
  padding: 16px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
}

.arch-layer__label {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 10px;
}

.arch-nodes {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.arch-nodes span {
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.78rem;
  background: var(--chip-bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.arch-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.arch-list li {
  padding: 16px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.arch-list strong {
  color: var(--text);
  margin-right: 6px;
}

/* CTA */
.cta-section {
  padding-bottom: 96px;
}

.cta-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 48px 52px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--cta-border);
  background: var(--cta-bg);
  box-shadow: var(--shadow);
}

.cta-card h2 {
  margin: 0 0 10px;
  font-size: clamp(1.4rem, 2.5vw, 1.85rem);
}

.cta-card p {
  margin: 0;
  color: var(--text-muted);
  max-width: min(30rem, 100%);
}

.contact-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.contact-list a,
.footer__contact a {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.contact-list a:hover,
.footer__contact a:hover {
  color: var(--accent, #6366f1);
}

/* Footer */
.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 40px 0 48px;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer__brand strong {
  font-size: 1.1rem;
}

.footer__brand span,
.footer__note,
.footer__contact,
.footer__copy {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin: 0;
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* PDF export (?export=pdf): match on-screen layout, not @media print */
html.pdf-export {
  -webkit-print-color-adjust: exact;
  print-color-adjust: exact;
}

html.pdf-export .theme-toggle,
html.pdf-export .nav__menu {
  display: none !important;
}

html.pdf-export .nav {
  position: relative !important;
  top: auto !important;
}

html.pdf-export .reveal {
  opacity: 1 !important;
  transform: none !important;
}

.dashboard-card,
.cap-card,
.workflow-step,
.highlight-card,
.arch-layer,
.nav,
.hero__stats div,
.theme-toggle {
  transition:
    background 0.35s ease,
    border-color 0.35s ease,
    box-shadow 0.35s ease,
    color 0.35s ease;
}

/* Responsive */
@media (max-width: 1024px) {
  .hero {
    padding-top: 48px;
  }

  .hero__inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero__visual {
    order: -1;
    min-height: 360px;
    max-width: min(var(--hero-mock-max), 100%);
    justify-self: center;
    margin-inline: auto;
  }

  .cap-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .workflow,
  .arch__layout {
    grid-template-columns: 1fr;
  }

  .workflow .section__header {
    margin-bottom: 32px;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-h: 64px;
    --gutter: clamp(16px, 4vw, 24px);
  }

  .container {
    padding-inline: max(var(--gutter), env(safe-area-inset-left, 0px))
      max(var(--gutter), env(safe-area-inset-right, 0px));
  }

  body.nav-open {
    overflow: hidden;
  }

  .nav__drawer {
    display: none;
  }

  .nav__inner {
    gap: 12px;
  }

  .theme-toggle {
    margin-left: auto;
    margin-right: 4px;
  }

  .nav__menu {
    display: flex;
  }

  .nav.is-open .nav__drawer {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    margin-left: 0;
    gap: 0;
    padding: 12px max(var(--gutter), env(safe-area-inset-left, 0px)) max(20px, env(safe-area-inset-bottom, 0px))
      max(var(--gutter), env(safe-area-inset-right, 0px));
    background: var(--nav-mobile-bg);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
  }

  [data-theme="dark"] .nav.is-open .nav__drawer {
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.35);
  }

  .nav.is-open .nav__links {
    flex-direction: column;
    gap: 4px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 12px;
  }

  .nav.is-open .nav__links a {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 4px 0;
    font-size: 1rem;
  }

  .nav.is-open .nav__actions {
    flex-direction: column;
    width: 100%;
    gap: 10px;
  }

  .nav.is-open .nav__actions .btn {
    width: 100%;
    min-height: 44px;
    justify-content: center;
  }

  .hero {
    padding: 40px 0 64px;
  }

  .hero__title {
    font-size: clamp(1.85rem, 7vw, 2.5rem);
  }

  .hero__subtitle {
    font-size: 1rem;
    margin-bottom: 24px;
  }

  .hero__cta {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    margin-bottom: 32px;
  }

  .hero__cta .btn {
    width: 100%;
    min-height: 44px;
    white-space: normal;
    text-align: center;
  }

  .hero__stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .hero__stats div {
    padding: 12px 14px;
  }

  .hero__stats dt {
    font-size: 1.2rem;
  }

  .hero__visual {
    min-height: 340px;
    padding-bottom: 8px;
  }

  .dashboard-card__header {
    padding: 12px 14px;
    flex-wrap: wrap;
  }

  .dashboard-card__title {
    flex: 1 1 100%;
    margin-left: 0;
    margin-top: 6px;
    font-size: 0.72rem;
    line-height: 1.4;
    word-break: break-all;
  }

  .dashboard-card__body {
    padding: 14px;
  }

  .dashboard-card--float {
    max-width: min(11rem, 46%);
    padding: 10px 12px;
  }

  .dashboard-card--policy {
    top: 4px;
    right: 4px;
  }

  .dashboard-card--rag {
    bottom: 8px;
    left: 4px;
  }

  .verify-item {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }

  .verify-item em {
    max-width: none;
    align-self: flex-start;
    text-align: left;
  }

  .section {
    padding: 56px 0;
  }

  .section__header {
    margin-bottom: 36px;
  }

  .section__header h2 {
    font-size: clamp(1.5rem, 5.5vw, 1.85rem);
  }

  .cap-grid,
  .highlight-grid {
    grid-template-columns: 1fr;
  }

  .cap-card,
  .highlight-card {
    padding: 22px 20px;
  }

  .workflow-step {
    padding: 18px 16px;
    gap: 14px;
  }

  .workflow-step__num {
    font-size: 1.25rem;
  }

  .cta-section {
    padding-bottom: 64px;
  }

  .cta-card {
    flex-direction: column;
    align-items: stretch;
    padding: 28px 22px;
    gap: 20px;
  }

  .cta-card .btn {
    width: 100%;
    min-height: 44px;
    justify-content: center;
  }

  .footer {
    padding: 32px 0 40px;
  }
}

@media (max-width: 480px) {
  :root {
    --hero-mock-max: 100%;
    --gutter: 16px;
  }

  .nav__logo-img {
    width: 36px;
    height: 36px;
  }

  .nav__name-zh {
    font-size: 0.95rem;
  }

  .nav__name-en {
    display: none;
  }

  .hero__badge {
    font-size: 0.78rem;
    margin-bottom: 16px;
  }

  .hero__stats {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .hero__stats dd {
    font-size: 0.72rem;
  }

  .hero__visual {
    min-height: 300px;
  }

  .dashboard-card--float {
    display: none;
  }

  .dashboard-card--main {
    animation: none;
  }

  .verify-summary {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .arch-list li {
    padding: 14px 16px;
    font-size: 0.85rem;
    line-height: 1.55;
  }

  .arch-nodes span {
    font-size: 0.72rem;
  }

  .btn--lg {
    padding: 0.7rem 1.25rem;
    font-size: 0.9rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .dashboard-card--main,
  .dashboard-card--float,
  .pulse { animation: none; }
  .reveal { opacity: 1; transform: none; }
}