/* ═══════════════════════════════════════════════════════════════════
   Momcozy Audit — Shared Design System
   路特 AI 公司 × Momcozy M1 v2.0
   ═══════════════════════════════════════════════════════════════════ */

/* ─── Brand Design Tokens ─────────────────────────────────────────── */
:root {
  --bg-white:       #ffffff;
  --bg-gray:        #f7f7f8;
  --bg-dark:        #0f0f10;
  --bg-card:        #fafafa;
  --text-primary:   #111111;
  --text-secondary: #5c5c5c;
  --text-tertiary:  #8a8a8a;
  --cta-black:      #111111;
  --accent:         #6a2b3a;
  --accent-light:   #fde8ec;
  --success:        #1f9d55;
  --success-light:  #e6f7ec;
  --warning:        #d97706;
  --warning-light:  #fef3c7;
  --danger:         #c53030;
  --danger-light:   #fee2e2;
  --info:           #2563eb;
  --info-light:     #dbeafe;
  --border:         #e5e5e5;
  --border-light:   #f0f0f0;
  --font:           'Montserrat', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono:      'JetBrains Mono', 'Menlo', 'Consolas', monospace;
  --shadow-sm:      0 1px 2px rgba(0,0,0,0.04);
  --shadow:         0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg:      0 12px 32px rgba(0,0,0,0.08);
  /* Radius system */
  --r-sm:   4px;
  --r-md:   8px;
  --r-lg:   12px;
  --r-xl:   16px;
  --r-pill: 999px;
}

/* ─── Reset ──────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  font-family: var(--font);
  font-size: 15px;
  font-weight: 400;
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
table { border-collapse: collapse; width: 100%; }
abbr[title] { text-decoration: none; border-bottom: 1px dashed var(--accent); cursor: help; }
abbr[title]:hover { color: var(--accent); }

/* ─── Utility ────────────────────────────────────────────────────── */
.container { max-width: 1240px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section--alt { padding: 96px 0; }
.section--gray { background: var(--bg-gray); }
.section--dark { background: var(--bg-dark); color: #f4f4f4; }
.section__head { margin-bottom: 48px; }
.section__eyebrow {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.section__title {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 16px;
}
.section--dark .section__title { color: #ffffff; }
.section__sub {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 720px;
}
.section--dark .section__sub { color: #bdbdbd; }

/* ─── Transition Banner (section connectors) ─────────────────────── */
.transition-banner {
  background: var(--bg-gray);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  padding: 14px 0;
  text-align: center;
  font-size: 13px;
  color: var(--text-tertiary);
  font-weight: 500;
  letter-spacing: 0.02em;
}
.transition-banner strong { color: var(--accent); }

/* ─── Promo Banner ───────────────────────────────────────────────── */
.promo-banner {
  background: var(--cta-black);
  color: #fff;
  text-align: center;
  padding: 10px 16px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.promo-banner .dot {
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #1f9d55;
  margin: 0 12px 2px;
  vertical-align: middle;
}

/* ─── Scroll Progress ────────────────────────────────────────────── */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  background: var(--accent);
  z-index: 9999;
  width: 0%;
  transition: width 0.1s linear;
  border-radius: 0 2px 2px 0;
}

/* ─── Top Nav ────────────────────────────────────────────────────── */
.nav-top {
  background: rgba(255,255,255,0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-top__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.nav-logo {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}
.nav-logo span { color: var(--accent); }
.nav-logo .x {
  color: var(--text-tertiary);
  font-weight: 400;
  margin: 0 8px;
}
.nav-links {
  display: flex;
  gap: 22px;
  align-items: center;
}
.nav-links a {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--accent); }
.nav-cta {
  background: var(--cta-black);
  color: #fff !important;
  padding: 8px 16px;
  border-radius: var(--r-pill);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: background 0.2s;
}
.nav-cta:hover { background: var(--accent); }
.nav-main {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text-primary);
  padding: 6px 14px;
  border-radius: var(--r-md);
  transition: all 0.2s;
}
.nav-main:hover { background: var(--bg-gray); }
.nav-main--active {
  background: var(--accent);
  color: #fff !important;
}
.nav-main--active:hover { background: var(--accent); }

/* ─── Sub Nav ────────────────────────────────────────────────────── */
.nav-sub {
  max-width: 1240px;
  margin: 0 auto;
  padding: 8px 24px 10px;
  display: flex;
  gap: 18px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  border-top: 1px solid var(--border-light);
  font-size: 12px;
}
.nav-sub::-webkit-scrollbar { display: none; }
.nav-sub a {
  color: var(--text-tertiary);
  font-weight: 500;
  transition: color 0.15s;
  white-space: nowrap;
}
.nav-sub a:hover { color: var(--accent); }

/* ─── Card System ────────────────────────────────────────────────── */
.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 24px;
}
.card--accent {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.card--danger {
  background: var(--danger-light);
  border-color: var(--danger);
}
.card--success {
  background: var(--success-light);
  border-color: var(--success);
}
.card--info {
  background: var(--info-light);
  border-color: var(--info);
}

/* ─── So-What Callout ────────────────────────────────────────────── */
.callout {
  padding: 22px 28px;
  border-radius: var(--r-lg);
  border-left: 4px solid;
}
.callout--info {
  background: var(--info-light);
  border-color: var(--info);
}
.callout--accent {
  background: var(--accent-light);
  border-color: var(--accent);
}
.callout--danger {
  background: var(--danger-light);
  border-color: var(--danger);
}
.callout__label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.callout--info .callout__label { color: var(--info); }
.callout--accent .callout__label { color: var(--accent); }
.callout--danger .callout__label { color: var(--danger); }
.callout__title {
  font-size: 17px;
  font-weight: 800;
  margin-bottom: 10px;
  color: var(--text-primary);
}
.callout__body {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ─── Delta Tags ─────────────────────────────────────────────────── */
.delta {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--r-sm);
  margin-left: 6px;
}
.delta-bad   { background: var(--danger-light);  color: var(--danger); }
.delta-good  { background: var(--success-light); color: var(--success); }
.delta-warn  { background: var(--warning-light); color: var(--warning); }

/* ─── Status Dots ────────────────────────────────────────────────── */
.status-good { background: var(--success); box-shadow: 0 0 0 4px var(--success-light); }
.status-warn { background: var(--warning); box-shadow: 0 0 0 4px var(--warning-light); }
.status-bad  { background: var(--danger);  box-shadow: 0 0 0 4px var(--danger-light); }

/* ─── Footer ─────────────────────────────────────────────────────── */
.footer {
  background: var(--bg-dark);
  color: #bdbdbd;
  padding: 56px 0 32px;
  font-size: 13px;
}
.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer__brand {
  font-size: 20px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
}
.footer__brand span { color: var(--accent); }
.footer__desc { font-size: 13px; color: #8a8a8a; line-height: 1.7; }
.footer__col h4 {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #fff;
  margin-bottom: 12px;
}
.footer__col li { margin-bottom: 6px; color: #8a8a8a; }
.footer__col li strong { color: #fff; }
.footer__bottom {
  border-top: 1px solid #2a2a2c;
  padding-top: 24px;
  text-align: center;
  font-size: 12px;
  color: #6b6b6b;
}
@media (max-width: 980px) {
  .footer__grid { grid-template-columns: 1fr; gap: 24px; }
}

/* ─── Matrix Colors ──────────────────────────────────────────────── */
.cell-bad  { background: rgba(197,48,48,0.08);  color: var(--danger);  font-weight: 700; }
.cell-warn { background: rgba(217,119,6,0.08);  color: var(--warning); font-weight: 600; }
.cell-good { background: rgba(31,157,85,0.08);  color: var(--success); font-weight: 600; }

/* ─── Priority Tags ──────────────────────────────────────────────── */
.pri-p0   { background: var(--danger);     color: #fff; }
.pri-p1   { background: var(--warning);    color: #fff; }
.pri-p2   { background: var(--text-tertiary); color: #fff; }
.pri-info { background: var(--success-light); color: var(--success); }

/* ─── Back To Top ────────────────────────────────────────────────── */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s, transform 0.3s;
  z-index: 50;
  font-family: inherit;
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: all;
  transform: translateY(0);
}
.back-to-top:hover { background: #8b4357; }

/* ─── Scroll Reveal Animations ───────────────────────────────────── */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.5s ease, transform 0.5s ease;
  }
  .reveal.revealed {
    opacity: 1;
    transform: translateY(0);
  }
  .reveal-delay-1 { transition-delay: 0.1s; }
  .reveal-delay-2 { transition-delay: 0.2s; }
  .reveal-delay-3 { transition-delay: 0.3s; }
  .reveal-delay-4 { transition-delay: 0.4s; }
}

/* ─── Print Styles ───────────────────────────────────────────────── */
@media print {
  .nav-top, .promo-banner, .back-to-top, .scroll-progress, .nav-sub,
  .transition-banner { display: none !important; }
  .section { padding: 32px 0 !important; break-inside: avoid; }
  .reveal { opacity: 1 !important; transform: none !important; }
  .pr-tabs { display: none !important; }
  .pr-wrap { grid-template-columns: 1fr !important; }
  body { font-size: 12px; }
}

/* ─── Responsive ─────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .section { padding: 56px 0; }
  .section__title { font-size: 28px; }
  .nav-sub { gap: 14px; padding: 6px 24px 8px; font-size: 11px; }
  .back-to-top { bottom: 20px; right: 20px; }
}