/* ===== Breeze Dawn Theme Variables ===== */
:root {
  --primary: #7FB3D5;
  --primary-deep: #5A9BC4;
  --success: #82E0AA;
  --accent: #E5C07B;
  --warning: #F8C471;
  --danger: #E74C3C;
  --bg-page: #F4F6F7;
  --bg-surface: #FFFFFF;
  --bg-pastel-blue: #f8fafc;
  --bg-pastel-cyan: #f4f6f7;
  --bg-pastel-purple: #fdf4ff;
  --bg-pastel-gold: #fffbeb;
  --text-primary: #2C3E50;
  --text-secondary: #64748B;
  --border: #e2e8f0;
  --tooltip-bg: #34495e;
  --shadow-soft: 0 4px 20px rgba(127, 179, 213, 0.08);
  --shadow-card: 0 6px 24px rgba(127, 179, 213, 0.06);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --max-width: 1200px;
}

/* ===== Reset & Base ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  background: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--primary-deep); }
img { max-width: 100%; display: block; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ===== Top Accent Line (流沙金) ===== */
.top-accent {
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
}
.brand img { width: 32px; height: 32px; }
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.brand-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
}
.brand-parent {
  font-size: 9.5px;
  font-weight: 400;
  color: var(--text-secondary);
  margin-top: 1px;
  letter-spacing: 0.3px;
  white-space: nowrap;
}
.nav-links { display: flex; gap: 24px; list-style: none; }
.nav-links a {
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: all .2s;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}
.nav-cta {
  background: var(--primary);
  color: white !important;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  transition: background .2s;
}
.nav-cta:hover { background: var(--primary-deep); border-bottom-color: transparent !important; }
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--text-primary);
  cursor: pointer;
  padding: 4px 8px;
}

/* ===== Hero ===== */
.hero {
  padding: 96px 0 80px;
  background: linear-gradient(180deg, #ffffff 0%, var(--bg-page) 100%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: -200px;
  right: -200px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(127, 179, 213, 0.18), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  bottom: -150px;
  left: -150px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(130, 224, 170, 0.12), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.hero-inner { position: relative; text-align: center; max-width: 800px; margin: 0 auto; }
.hero-eyebrow {
  display: inline-block;
  padding: 6px 14px;
  background: var(--bg-pastel-gold);
  color: #b88a2c;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
  margin-bottom: 24px;
  letter-spacing: 0.5px;
}
.hero h1 {
  font-size: 56px;
  line-height: 1.1;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--text-primary), var(--primary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero .subtitle {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  font-weight: 500;
}
.hero .description {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: all .2s;
}
.btn-primary {
  background: var(--primary);
  color: white;
}
.btn-primary:hover {
  background: var(--primary-deep);
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--shadow-soft);
}
.btn-secondary {
  background: white;
  color: var(--primary);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  border-color: var(--primary);
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid transparent;
}
.btn-ghost:hover {
  color: var(--primary);
  background: rgba(127, 179, 213, 0.06);
  transform: translateY(-1px);
}
.btn-lg {
  padding: 16px 36px;
  font-size: 16px;
}
.nav-cta--login {
  background: linear-gradient(135deg, var(--primary), var(--primary-deep));
}
.nav-cta--login:hover {
  background: linear-gradient(135deg, var(--primary-deep), var(--primary));
  box-shadow: 0 4px 14px rgba(90, 155, 196, 0.3);
}

/* ===== Section common ===== */
section { padding: 80px 0; }
.section-title {
  text-align: center;
  margin-bottom: 56px;
}
.section-title h2 {
  font-size: 36px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.section-title p {
  font-size: 16px;
  color: var(--text-secondary);
}
.section-title .accent-bar {
  width: 48px;
  height: 3px;
  background: var(--accent);
  margin: 16px auto 0;
  border-radius: 2px;
}

/* ===== Core Pillars (3 main selling points) ===== */
.core {
  background: white;
  padding-top: 64px;
}
.core-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}
.core-card {
  position: relative;
  padding: 40px 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: white;
  overflow: hidden;
  transition: all .25s;
}
.core-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}
.core-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
  border-color: rgba(127, 179, 213, 0.4);
}
.core-card .pill {
  display: inline-block;
  padding: 4px 12px;
  background: var(--bg-pastel-blue);
  color: var(--primary-deep);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
  margin-bottom: 16px;
  letter-spacing: 0.3px;
}
.core-card h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.core-card .lead {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}
.core-card .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.core-card .meta span {
  font-size: 12px;
  padding: 3px 10px;
  background: var(--bg-pastel-cyan);
  color: var(--text-secondary);
  border-radius: 999px;
}

/* ===== Features (4 modules) ===== */
.features {
  background: var(--bg-page);
  padding-top: 56px;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.feature-card {
  background: white;
  padding: 32px 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  transition: all .25s;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: rgba(127, 179, 213, 0.4);
}
.feature-card .icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
}
.feature-card.ads .icon { background: var(--bg-pastel-blue); color: var(--primary); }
.feature-card.products .icon { background: var(--bg-pastel-cyan); color: var(--primary-deep); }
.feature-card.orders .icon { background: var(--bg-pastel-purple); color: #9b6bb3; }
.feature-card.tasks .icon { background: var(--bg-pastel-gold); color: #b88a2c; }
.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}
.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== Detailed modules (Module sections) ===== */
.modules { background: var(--bg-page); }
.module-block {
  background: white;
  border-radius: var(--radius-md);
  padding: 36px 32px;
  margin-bottom: 24px;
  border: 1px solid var(--border);
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 32px;
  align-items: start;
}
.module-block:last-child { margin-bottom: 0; }
.module-label h3 {
  font-size: 22px;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.module-label .tag {
  display: inline-block;
  padding: 3px 10px;
  background: var(--bg-pastel-blue);
  color: var(--primary-deep);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
}
.module-content ul {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 32px;
}
.module-content li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}
.module-content li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  opacity: 0.7;
}
.module-content li strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ===== Highlights (3 badges) ===== */
.highlights { background: white; }
.highlight-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}
.highlight-card {
  text-align: center;
  padding: 36px 24px;
  border-radius: var(--radius-md);
  background: var(--bg-pastel-cyan);
  border: 1px solid var(--border);
}
.highlight-card .num {
  font-size: 40px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}
.highlight-card h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}
.highlight-card p {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ===== About ===== */
.about {
  background: white;
}
.about-card {
  display: grid;
  gap: 48px;
}
.about-eyebrow {
  display: inline-block;
  padding: 4px 12px;
  background: var(--bg-pastel-gold);
  color: #b88a2c;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 1px;
  margin-bottom: 16px;
}
.about-intro h3 {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 18px;
  background: linear-gradient(135deg, var(--text-primary), var(--primary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.about-intro p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 14px;
}
.about-intro p:last-child { margin-bottom: 0; }
.about-intro strong {
  color: var(--text-primary);
  font-weight: 600;
}
.about-traits {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.trait-card {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  align-items: center;
  padding: 20px 22px;
  background: var(--bg-pastel-cyan);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all .2s;
}
.trait-body { min-width: 0; }
.trait-card:hover {
  transform: translateY(-3px);
  border-color: rgba(127, 179, 213, 0.4);
  box-shadow: var(--shadow-soft);
}
.trait-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--primary), var(--success));
  color: white;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.5px;
}
.trait-card h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.trait-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ===== Login ===== */
.login {
  background: var(--bg-page);
}
.login-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  background: white;
  padding: 48px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}
.login-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}
.login-info h3 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.login-info p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}
.login-meta {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.login-meta li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--text-secondary);
}
.login-meta li span {
  display: inline-block;
  min-width: 64px;
  padding: 3px 10px;
  background: var(--bg-pastel-blue);
  color: var(--primary-deep);
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-align: center;
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
}
.login-cta {
  text-align: center;
}
.login-cta .btn-lg {
  width: 100%;
  max-width: 280px;
  margin-bottom: 16px;
}
.login-hint {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.login-hint code {
  background: var(--bg-pastel-cyan);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 12px;
  color: var(--primary-deep);
}
.login-hint--muted {
  font-size: 12px;
  margin-top: 12px;
  opacity: 0.85;
}
.login-hint--muted a {
  color: var(--primary-deep);
  font-weight: 500;
}

/* ===== About Contact (subsection within About) ===== */
.about-contact {
  margin-top: 56px;
  padding: 36px 44px;
  background: linear-gradient(135deg, #f0f7fc 0%, #ebf5f0 100%);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  align-items: center;
}
.about-contact-title h4 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}
.contact-eyebrow {
  display: inline-block;
  padding: 4px 12px;
  background: var(--bg-pastel-blue);
  color: var(--primary-deep);
  border-radius: 999px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 1px;
  margin-bottom: 12px;
}
.contact-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 24px;
}
.contact-list li {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 12px;
  align-items: start;
}
.contact-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 18px;
}
.contact-label {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.3px;
  margin-bottom: 4px;
}
.contact-value {
  font-size: 13.5px;
  color: var(--text-primary);
  line-height: 1.55;
}
.contact-value a {
  color: var(--primary-deep);
  font-weight: 500;
}
.contact-value a:hover {
  color: var(--primary);
  text-decoration: underline;
}

/* ===== Footer ===== */
.site-footer {
  background: white;
  border-top: 1px solid var(--border);
  padding: 28px 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-left {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.footer-inner .copyright {
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 500;
}
.footer-product {
  color: var(--text-secondary);
  font-size: 12px;
  letter-spacing: 0.3px;
}
.footer-right {
  display: flex;
  gap: 20px;
  align-items: center;
}
.footer-right a { color: var(--text-secondary); font-size: 13px; }
.footer-right a:hover { color: var(--primary); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-links {
    position: absolute;
    top: 64px;
    right: 0;
    left: 0;
    flex-direction: column;
    gap: 0;
    background: white;
    border-bottom: 1px solid var(--border);
    padding: 8px 0;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; text-align: center; }
  .nav-links a { display: block; padding: 12px 24px; }
  .menu-toggle { display: block; }
  .nav-cta { display: none; }

  .hero { padding: 64px 0 56px; }
  .hero h1 { font-size: 36px; }
  .hero .subtitle { font-size: 16px; }
  section { padding: 56px 0; }
  .section-title h2 { font-size: 26px; }
  .module-block {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 24px 20px;
  }
  .module-content ul { grid-template-columns: 1fr; }

  .login-card {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 28px 20px;
  }

  .brand-parent { display: none; }

  .about-card {
    gap: 32px;
  }
  .about-traits {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .about-contact {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 28px 22px;
    margin-top: 36px;
  }
  .about-contact .contact-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  .footer-right { gap: 16px; flex-wrap: wrap; }
}