* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  color: #182235;
  background: #f5f7fb;
}

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

.site-header,
.app-header {
  height: 72px;
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255,255,255,0.92);
  border-bottom: 1px solid #e7ebf3;
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand.small .brand-title {
  font-size: 18px;
}

.brand-mark {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  letter-spacing: .5px;
  background: linear-gradient(135deg, #1b4fd8, #16a3ff);
  box-shadow: 0 12px 28px rgba(27, 79, 216, .22);
}

.brand-title {
  font-size: 20px;
  font-weight: 750;
}

.brand-subtitle {
  margin-top: 2px;
  font-size: 12px;
  color: #68758b;
}

.top-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 14px;
  color: #4b5870;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  padding: 10px 18px;
  border: 1px solid transparent;
  font-weight: 650;
  cursor: pointer;
}

.btn-primary {
  color: #fff;
  background: #1b63e8;
  box-shadow: 0 12px 24px rgba(27, 99, 232, .18);
}

.btn-secondary {
  color: #1d4ed8;
  background: #eaf1ff;
}

.btn-light {
  color: #fff;
  background: #1b63e8;
}

.btn-outline {
  border-color: #d8dfec;
  background: #fff;
  color: #344055;
}

.btn.full {
  width: 100%;
}

.hero {
  min-height: 560px;
  padding: 76px 40px 60px;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, .75fr);
  gap: 36px;
  align-items: center;
  max-width: 1180px;
  margin: 0 auto;
}

.eyebrow {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  color: #1d4ed8;
  background: #eaf1ff;
  font-size: 13px;
  font-weight: 700;
}

.hero h1 {
  margin: 18px 0;
  font-size: 54px;
  line-height: 1.08;
  letter-spacing: -1.8px;
}

.hero p {
  max-width: 680px;
  font-size: 18px;
  line-height: 1.85;
  color: #5d6a80;
}

.hero-actions {
  margin-top: 30px;
  display: flex;
  gap: 14px;
}

.hero-card {
  padding: 34px;
  border-radius: 28px;
  background: #fff;
  border: 1px solid #e6ebf4;
  box-shadow: 0 30px 80px rgba(38, 54, 93, .12);
}

.card-label {
  color: #1d4ed8;
  font-size: 13px;
  font-weight: 800;
}

.hero-card h3 {
  margin: 14px 0 10px;
  font-size: 26px;
}

.hero-card p {
  font-size: 15px;
  line-height: 1.75;
  color: #637086;
}

.section {
  max-width: 1180px;
  margin: 0 auto 56px;
  padding: 0 40px;
}

.section-title span,
.workspace-title span {
  color: #1d4ed8;
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.section-title h2,
.workspace-title h1 {
  margin: 10px 0 20px;
  font-size: 34px;
}

.product-grid,
.tool-grid,
.placeholder-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.product-card,
.tool-card,
.mini-card {
  background: #fff;
  border: 1px solid #e7ebf3;
  border-radius: 22px;
  padding: 26px;
  box-shadow: 0 16px 40px rgba(30, 46, 82, .07);
}

.product-card h3,
.tool-card h2 {
  margin: 14px 0 6px;
  font-size: 26px;
}

.product-subtitle,
.tool-card h3 {
  margin: 0 0 16px;
  color: #1d4ed8;
  font-size: 16px;
}

.product-card p,
.tool-card p,
.mini-card p {
  color: #627089;
  line-height: 1.7;
}

.product-badge,
.tool-status {
  display: inline-flex;
  padding: 5px 10px;
  border-radius: 999px;
  background: #f0f5ff;
  color: #1d4ed8;
  font-size: 12px;
  font-weight: 800;
}

.muted-section {
  padding-top: 30px;
  padding-bottom: 40px;
}

.flow {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}

.flow div {
  background: #fff;
  border: 1px solid #e7ebf3;
  border-radius: 16px;
  padding: 18px 14px;
  text-align: center;
  color: #344055;
  font-weight: 700;
}

.footer {
  margin-top: 40px;
  padding: 30px 40px;
  display: flex;
  justify-content: space-between;
  color: #7a869a;
  border-top: 1px solid #e7ebf3;
  background: #fff;
}

.auth-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at top left, rgba(27, 99, 232, .16), transparent 36%),
    #f5f7fb;
}

.auth-panel {
  width: min(420px, calc(100vw - 36px));
  background: #fff;
  border: 1px solid #e7ebf3;
  border-radius: 26px;
  padding: 32px;
  box-shadow: 0 30px 80px rgba(38, 54, 93, .14);
}

.back-link {
  display: inline-block;
  margin-bottom: 18px;
  color: #637086;
  font-size: 14px;
}

.auth-brand {
  width: 54px;
  height: 54px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  color: #fff;
  background: linear-gradient(135deg, #1b4fd8, #16a3ff);
  font-weight: 900;
}

.auth-panel h1 {
  margin: 18px 0 8px;
}

.auth-panel p,
.auth-note {
  color: #68758b;
  line-height: 1.7;
}

.auth-form {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.auth-form label {
  display: grid;
  gap: 8px;
  color: #344055;
  font-size: 14px;
  font-weight: 700;
}

.auth-form input {
  height: 46px;
  border-radius: 12px;
  border: 1px solid #d8dfec;
  padding: 0 14px;
  font-size: 15px;
}

.auth-note {
  margin-top: 18px;
  font-size: 13px;
}

.error-box {
  margin-top: 18px;
  padding: 12px 14px;
  border-radius: 12px;
  color: #b42318;
  background: #fff1f0;
  border: 1px solid #ffd0cc;
}

.workspace {
  max-width: 1180px;
  margin: 0 auto;
  padding: 56px 40px;
}

.workspace-title p {
  max-width: 680px;
  color: #637086;
  line-height: 1.7;
}

.tool-grid {
  margin-top: 30px;
}

.tool-card {
  display: block;
  min-height: 270px;
  transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease;
}

.tool-card:hover {
  transform: translateY(-4px);
  border-color: #bed3ff;
  box-shadow: 0 26px 60px rgba(27, 99, 232, .12);
}

.tool-enter {
  margin-top: 28px;
  color: #1d4ed8;
  font-weight: 800;
}

.system-body {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  background: #111827;
  color: #fff;
  padding: 22px;
}

.sidebar-title {
  display: flex;
  gap: 12px;
  align-items: center;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255,255,255,.12);
}

.sidebar-title span {
  display: block;
  margin-top: 4px;
  color: #aab4c6;
  font-size: 12px;
}

.side-menu {
  display: grid;
  gap: 6px;
  margin-top: 20px;
}

.side-menu a {
  padding: 11px 12px;
  border-radius: 10px;
  color: #d7deeb;
  font-size: 14px;
}

.side-menu a:hover {
  background: rgba(255,255,255,.08);
}

.system-main {
  padding: 28px;
}

.system-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.system-topbar h1 {
  margin: 0 0 6px;
}

.system-topbar p {
  margin: 0;
  color: #637086;
}

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

.placeholder-panel {
  background: #fff;
  border: 1px solid #e7ebf3;
  border-radius: 24px;
  padding: 32px;
  box-shadow: 0 16px 40px rgba(30, 46, 82, .07);
}

.placeholder-panel h2 {
  margin: 16px 0 12px;
}

.placeholder-panel p {
  color: #637086;
  line-height: 1.8;
  max-width: 820px;
}

.placeholder-grid {
  margin-top: 22px;
}

@media (max-width: 920px) {
  .hero,
  .product-grid,
  .tool-grid,
  .placeholder-grid,
  .flow {
    grid-template-columns: 1fr;
  }

  .site-header,
  .app-header {
    padding: 0 20px;
  }

  .hero {
    padding: 46px 20px;
  }

  .hero h1 {
    font-size: 38px;
  }

  .section,
  .workspace {
    padding-left: 20px;
    padding-right: 20px;
  }

  .system-body {
    grid-template-columns: 1fr;
  }

  .sidebar {
    display: none;
  }

  .system-topbar {
    align-items: flex-start;
    gap: 16px;
    flex-direction: column;
  }
}