@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Plus+Jakarta+Sans:wght@600;700;800&display=swap');

:root {
  --bg: #FAFAFA;
  --fg: #0F172A;
  --muted: #F1F5F9;
  --muted-fg: #64748B;
  --accent: #0052FF;
  --accent-2: #4D7CFF;
  --accent-fg: #FFFFFF;
  --border: #E2E8F0;
  --card: #FFFFFF;
  --success: #10B981;
  --warning: #F59E0B;
  --error: #EF4444;
  --color-primary: #0052FF;
  --color-primary-dark: #1E40AF;
  --color-primary-darker: #1E3A8A;
  --color-primary-light: #4D7CFF;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  --color-text: #0F172A;
  --color-text-secondary: #64748B;
  --color-text-muted: #94A3B8;
  --color-border: #E2E8F0;
  --color-bg: #FAFAFA;
  --color-muted: #F1F5F9;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.08);
  --shadow-xl: 0 20px 25px rgba(0,0,0,0.1);
  --shadow-accent: 0 4px 14px rgba(0,82,255,0.25);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', 'Noto Sans SC', 'Microsoft YaHei UI', sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  padding-top: 64px;
}

h1, h2, h3, h4 {
  font-family: 'Plus Jakarta Sans', 'Inter', 'Noto Sans SC', sans-serif;
  font-weight: 800;
  line-height: 1.15;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: 1.25rem; }

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-2); }
img { max-width: 100%; height: auto; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
.section { padding: 5rem 0; }
.section-dark { background: var(--fg); color: #fff; }
.section-muted { background: var(--muted); }

.section-header { text-align: center; margin-bottom: 3.5rem; }
.section-header p {
  color: var(--muted-fg);
  font-size: 1.125rem;
  margin-top: 1rem;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}
.section-dark .section-header p { color: #94A3B8; }

.text-gradient {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Navbar */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(250,250,250,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s;
}
.navbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; max-width: 1200px; margin: 0 auto; padding: 0 1.5rem;
}
.navbar-brand {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 800; font-size: 1.35rem; color: var(--fg); letter-spacing: -0.02em;
}
.navbar-brand span { color: var(--accent); }
.navbar-links { display: flex; align-items: center; gap: 0.25rem; list-style: none; }
.navbar-links a {
  color: var(--muted-fg); font-size: 0.875rem; font-weight: 500;
  padding: 0.5rem 0.75rem; border-radius: var(--radius-sm); transition: all 0.2s;
}
.navbar-links a:hover, .navbar-links a.active { color: var(--fg); background: var(--muted); }
.navbar-actions { display: flex; align-items: center; gap: 0.75rem; }
.navbar-toggle {
  display: none; background: none; border: none; cursor: pointer; padding: 0.5rem;
}
.navbar-toggle span {
  display: block; width: 20px; height: 2px; background: var(--fg); margin: 4px 0; transition: 0.3s;
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  font-family: 'Inter', sans-serif; font-size: 0.875rem; font-weight: 600;
  padding: 0.625rem 1.25rem; border-radius: var(--radius-sm); border: none;
  cursor: pointer; transition: all 0.2s; white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff; box-shadow: var(--shadow-accent);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 8px 24px rgba(0,82,255,0.35); }
.btn-secondary { background: var(--fg); color: #fff; }
.btn-secondary:hover { background: #1E293B; }
.btn-outline { background: transparent; color: var(--fg); border: 1.5px solid var(--border); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-ghost { background: transparent; color: var(--muted-fg); }
.btn-ghost:hover { color: var(--fg); background: var(--muted); }
.btn-lg { font-size: 1rem; padding: 0.875rem 2rem; border-radius: var(--radius); }
.btn-sm { font-size: 0.8125rem; padding: 0.375rem 0.875rem; }

/* Cards */
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem; transition: all 0.3s;
}
.card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }

/* Grid */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }

/* Hero */
.hero {
  padding-top: 4rem; padding-bottom: 5rem; position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -20%; right: -10%; width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(0,82,255,0.08) 0%, transparent 70%);
  border-radius: 50%; pointer-events: none;
}
.hero::after {
  content: ''; position: absolute; bottom: -30%; left: -5%; width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(77,124,255,0.06) 0%, transparent 70%);
  border-radius: 50%; pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; }
.hero h1 { margin-bottom: 1.5rem; }
.hero-subtitle {
  font-size: 1.25rem; color: var(--muted-fg); max-width: 600px;
  margin-bottom: 2.5rem; line-height: 1.7;
}
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

/* Steps */
.steps { display: flex; gap: 2rem; align-items: flex-start; }
.step { flex: 1; text-align: center; position: relative; }
.step-number {
  display: inline-flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff; font-weight: 700; font-size: 1.125rem; margin-bottom: 1rem;
}
.step h4 { margin-bottom: 0.5rem; }
.step p { color: var(--muted-fg); font-size: 0.9375rem; }
.step-connector {
  position: absolute; top: 24px; right: -1rem; width: 2rem; height: 2px; background: var(--border);
}

/* Teacher Card */
.teacher-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; transition: all 0.3s;
}
.teacher-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.teacher-card-img {
  width: 100%; height: 200px;
  background: linear-gradient(135deg, #E0E7FF, #DBEAFE);
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem; position: relative;
}
.teacher-card-badge {
  position: absolute; top: 0.75rem; right: 0.75rem;
  background: var(--success); color: #fff; font-size: 0.75rem; font-weight: 600;
  padding: 0.25rem 0.625rem; border-radius: 999px;
}
.teacher-card-body { padding: 1.25rem; }
.teacher-card-name { font-weight: 700; font-size: 1rem; margin-bottom: 0.25rem; }
.teacher-card-meta { color: var(--muted-fg); font-size: 0.8125rem; margin-bottom: 0.75rem; }
.teacher-card-tags { display: flex; flex-wrap: wrap; gap: 0.375rem; margin-bottom: 1rem; }
.teacher-card-score {
  display: inline-flex; align-items: center; gap: 0.375rem;
  font-weight: 700; color: var(--accent); font-size: 0.875rem;
}

/* Job Card */
.job-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem; transition: all 0.3s;
}
.job-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.job-card-title { font-weight: 700; font-size: 1.0625rem; margin-bottom: 0.5rem; }
.job-card-company { color: var(--muted-fg); font-size: 0.875rem; margin-bottom: 1rem; }
.job-card-details { display: flex; gap: 1.5rem; margin-bottom: 1rem; font-size: 0.875rem; color: var(--muted-fg); }
.job-card-salary { font-weight: 700; color: var(--accent); }

/* Tag / Badge */
.tag {
  display: inline-flex; align-items: center; font-size: 0.75rem; font-weight: 500;
  padding: 0.25rem 0.625rem; border-radius: 999px; background: var(--muted); color: var(--muted-fg);
}
.tag-accent { background: #EFF6FF; color: var(--accent); }
.tag-success { background: #ECFDF5; color: var(--success); }
.tag-warning { background: #FFFBEB; color: var(--warning); }

/* KPI */
.kpi { text-align: center; padding: 1.5rem; }
.kpi-label {
  font-size: 0.8125rem; color: var(--muted-fg); text-transform: uppercase;
  letter-spacing: 0.05em; margin-bottom: 0.5rem;
}
.kpi-value { font-size: 2rem; font-weight: 800; font-family: 'Plus Jakarta Sans', sans-serif; }

/* Form */
.form-group { margin-bottom: 1.25rem; }
.form-label { display: block; font-size: 0.875rem; font-weight: 500; margin-bottom: 0.375rem; color: var(--fg); }
.form-input, .form-select, .form-textarea {
  width: 100%; padding: 0.75rem 1rem; border: 1.5px solid var(--border);
  border-radius: var(--radius-sm); font-family: inherit; font-size: 0.9375rem;
  color: var(--fg); background: var(--card); transition: border-color 0.2s, box-shadow 0.2s; outline: none;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--accent); box-shadow: 0 0 0 3px rgba(0,82,255,0.1);
}
.form-textarea { resize: vertical; min-height: 100px; }

/* Alert */
.alert { padding: 1rem 1.25rem; border-radius: var(--radius-sm); font-size: 0.9375rem; margin-bottom: 1rem; }
.alert-error { background: #FEF2F2; color: var(--error); }
.alert-success { background: #ECFDF5; color: var(--success); }
.alert-warning { background: #FFFBEB; color: var(--warning); }
.alert-info { background: #EFF6FF; color: var(--accent); }

/* Footer */
.footer { background: var(--fg); color: #94A3B8; padding: 4rem 0 2rem; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; margin-bottom: 3rem; }
.footer-brand {
  font-family: 'Plus Jakarta Sans', sans-serif; font-weight: 800;
  font-size: 1.35rem; color: #fff; margin-bottom: 0.75rem;
}
.footer-brand span { color: var(--accent-2); }
.footer-desc { font-size: 0.875rem; line-height: 1.7; max-width: 300px; }
.footer-col h4 {
  color: #fff; font-size: 0.875rem; font-weight: 600; margin-bottom: 1rem;
  text-transform: uppercase; letter-spacing: 0.05em;
}
.footer-col a { display: block; color: #94A3B8; font-size: 0.875rem; padding: 0.25rem 0; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid #1E293B; padding-top: 1.5rem;
  display: flex; justify-content: space-between; font-size: 0.8125rem;
}

/* Passport */
.passport-header {
  display: flex; gap: 2rem; align-items: flex-start; padding: 2rem;
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); margin-bottom: 2rem;
}
.passport-avatar {
  width: 120px; height: 120px; border-radius: 50%;
  background: linear-gradient(135deg, #E0E7FF, #DBEAFE);
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem; flex-shrink: 0;
}
.passport-info h1 { font-size: 1.75rem; margin-bottom: 0.25rem; }
.passport-scores { display: flex; gap: 1.5rem; margin-top: 1rem; }
.passport-score { text-align: center; }
.passport-score-value {
  font-size: 1.75rem; font-weight: 800; color: var(--accent);
  font-family: 'Plus Jakarta Sans', sans-serif;
}
.passport-score-label {
  font-size: 0.75rem; color: var(--muted-fg); text-transform: uppercase; letter-spacing: 0.05em;
}

/* Search */
.search-bar { display: flex; gap: 0.75rem; margin-bottom: 2rem; }
.search-bar .form-input { flex: 1; }
.search-filters { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-bottom: 2rem; }

/* Dashboard */
.dashboard-grid {
  display: grid; grid-template-columns: 240px 1fr; gap: 2rem; min-height: calc(100vh - 64px);
}
.dashboard-sidebar { background: var(--card); border-right: 1px solid var(--border); padding: 1.5rem 0; }
.dashboard-sidebar a {
  display: flex; align-items: center; gap: 0.75rem; padding: 0.75rem 1.5rem;
  color: var(--muted-fg); font-size: 0.875rem; font-weight: 500; transition: all 0.2s;
}
.dashboard-sidebar a:hover, .dashboard-sidebar a.active { color: var(--accent); background: #EFF6FF; }
.dashboard-main { padding: 2rem; }

/* Responsive */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .steps { flex-direction: column; gap: 1.5rem; }
  .step-connector { display: none; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 0.5rem; }
  .navbar-links { display: none; }
  .navbar-toggle { display: block; }
  .navbar-links.open {
    display: flex; flex-direction: column; position: absolute;
    top: 64px; left: 0; right: 0; background: var(--bg);
    padding: 1rem; border-bottom: 1px solid var(--border); box-shadow: var(--shadow-lg);
  }
  .passport-header { flex-direction: column; align-items: center; text-align: center; }
  .passport-scores { justify-content: center; }
  .search-bar { flex-direction: column; }
  .dashboard-grid { grid-template-columns: 1fr; }
  .dashboard-sidebar { display: none; }
}

/* Animations */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(28px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.animate-in { animation: fadeInUp 0.7s ease-out both; }
.animate-fade { animation: fadeIn 0.7s ease-out both; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

/* Stats Bar */
.stats-bar {
  display: flex; align-items: center; justify-content: center; gap: 3rem;
  text-align: center;
}
.stat-item { flex: 1; }
.stat-number {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 2.5rem; font-weight: 800; color: #fff;
  line-height: 1.2;
}
.stat-label {
  font-size: 0.875rem; color: #94A3B8; margin-top: 0.25rem;
  text-transform: uppercase; letter-spacing: 0.05em;
}
.stat-divider {
  width: 1px; height: 48px; background: #1E293B;
}

/* Teacher Card Stats */
.teacher-card-stats {
  display: flex; gap: 0.75rem; margin-bottom: 0.75rem;
  font-size: 0.75rem; color: var(--muted-fg);
  flex-wrap: wrap;
}

/* Residency Badge */
.residency-badge {
  background: linear-gradient(135deg, #10B981, #059669) !important;
  font-weight: 600 !important;
  color: #fff !important;
  font-size: 0.6875rem !important;
  padding: 0.25rem 0.625rem !important;
  border-radius: 999px !important;
  white-space: nowrap !important;
  letter-spacing: 0 !important;
  text-transform: none !important;
  display: inline-block !important;
}

/* Passport Demo */
.passport-demo {
  display: grid; grid-template-columns: 1fr 1.5fr; gap: 3rem; align-items: center;
}
.passport-demo-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 2rem;
  box-shadow: var(--shadow-xl);
}
.passport-demo-header {
  display: flex; align-items: center; gap: 1rem; margin-bottom: 1.5rem;
}
.passport-demo-avatar {
  width: 56px; height: 56px; border-radius: 50%;
  background: linear-gradient(135deg, #E0E7FF, #DBEAFE);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; flex-shrink: 0;
}
.passport-demo-scores {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem;
  text-align: center; padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

/* Live Classroom */
.live-classroom-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem;
  transition: all 0.3s;
}
.live-classroom-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.live-indicator {
  display: inline-flex; align-items: center; gap: 0.375rem;
  font-size: 0.75rem; font-weight: 700; color: var(--error);
  text-transform: uppercase; letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}
.live-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--error); animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(1.3); }
}
.live-classroom-teacher {
  display: flex; align-items: flex-start;
}

@media (max-width: 768px) {
  .stats-bar { flex-direction: column; gap: 1.5rem; }
  .stat-divider { width: 64px; height: 1px; }
  .passport-demo { grid-template-columns: 1fr; }
}

.text-center { text-align: center; }
.text-sm { font-size: 0.875rem; }
.text-muted { color: var(--muted-fg); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.w-full { width: 100%; }
.hidden { display: none; }