/* ============================================================
   AstraBit – IT & Cybersecurity Academy
   Premium Dark-Mode Design System
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* ─── CSS Variables ────────────────────────────────────────── */
:root {
  /* Color Palette */
  --clr-bg:           #080c14;
  --clr-surface:      #0d1320;
  --clr-surface-2:    #111827;
  --clr-border:       rgba(255, 255, 255, 0.07);
  --clr-border-hover: rgba(0, 230, 184, 0.3);

  /* Brand */
  --clr-primary:      #00e6b8;   /* teal-mint */
  --clr-primary-dim:  rgba(0, 230, 184, 0.12);
  --clr-secondary:    #3b82f6;   /* blue */
  --clr-accent:       #8b5cf6;   /* violet */

  /* Text */
  --clr-text:         #e8edf5;
  --clr-muted:        #7a8899;
  --clr-subtle:       #3d4a5c;

  /* Gradients */
  --grad-hero:  linear-gradient(135deg, #080c14 0%, #0d1e32 50%, #080c14 100%);
  --grad-card:  linear-gradient(145deg, #111827, #0d1320);
  --grad-glow:  radial-gradient(ellipse 60% 50% at 50% 0%, rgba(0, 230, 184, 0.08) 0%, transparent 70%);

  /* Spacing */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* Typography */
  --font-main:  'Inter', sans-serif;
  --font-display: 'Space Grotesk', sans-serif;

  /* Transitions */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─── Light Mode Overrides ─────────────────────────────────── */
body.light-mode {
  --clr-bg:           #f8fafc;
  --clr-surface:      #ffffff;
  --clr-surface-2:    #f1f5f9;
  --clr-border:       rgba(0, 0, 0, 0.08);
  --clr-border-hover: rgba(0, 230, 184, 0.5);

  --clr-text:         #0f172a;
  --clr-muted:        #64748b;
  --clr-subtle:       #cbd5e1;

  --grad-hero:  linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  --grad-card:  linear-gradient(145deg, #ffffff, #f8fafc);
  --grad-glow:  radial-gradient(ellipse 60% 50% at 50% 0%, rgba(0, 230, 184, 0.15) 0%, transparent 70%);
}

/* ─── Reset & Base ──────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-main);
  background-color: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ─── Scrollbar ─────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--clr-bg); }
::-webkit-scrollbar-thumb { background: var(--clr-subtle); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--clr-primary); }

/* ─── Utility ───────────────────────────────────────────────── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-primary);
  background: var(--clr-primary-dim);
  border: 1px solid rgba(0, 230, 184, 0.2);
  padding: 6px 16px;
  border-radius: 99px;
  margin-bottom: 20px;
}
.section-tag::before {
  content: '';
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--clr-primary);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--clr-text);
  margin-bottom: 14px;
}
.section-title span { color: var(--clr-primary); }

.section-subtitle {
  font-size: 1rem;
  color: var(--clr-muted);
  max-width: 520px;
  line-height: 1.7;
}

/* ─── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font-main);
  cursor: pointer;
  border: none;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.07);
  opacity: 0;
  transition: var(--transition);
}
.btn:hover::after { opacity: 1; }

.btn-primary {
  background: var(--clr-primary);
  color: #080c14;
  box-shadow: 0 0 24px rgba(0, 230, 184, 0.3);
}
.btn-primary:hover {
  box-shadow: 0 0 36px rgba(0, 230, 184, 0.5);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--clr-text);
  border: 1px solid var(--clr-border);
}
.btn-outline:hover {
  border-color: var(--clr-primary);
  color: var(--clr-primary);
  transform: translateY(-2px);
}

/* ─── Navbar ────────────────────────────────────────────────── */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(8, 12, 20, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--clr-border);
  transition: var(--transition);
}
#navbar.scrolled {
  background: rgba(8, 12, 20, 0.96);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--clr-text);
}
.nav-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: var(--clr-primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: #080c14;
  font-weight: 900;
  flex-shrink: 0;
}
.nav-logo span { color: var(--clr-primary); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links a {
  padding: 8px 16px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--clr-muted);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  position: relative;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--clr-text);
  background: rgba(255,255,255,0.05);
}
.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 2px;
  background: var(--clr-primary);
  border-radius: 99px;
}

.nav-cta { margin-left: 16px; }

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--clr-border);
  color: var(--clr-text);
  cursor: pointer;
  margin-left: 12px;
  transition: var(--transition);
  font-size: 1.1rem;
}
.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--clr-primary);
  color: var(--clr-primary);
}
body.light-mode .theme-toggle {
    background: rgba(0, 0, 0, 0.03);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--clr-text);
  border-radius: 2px;
  transition: var(--transition);
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  display: flex;
  flex-direction: column;
  background: var(--clr-bg);
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  border-bottom: 1px solid transparent;
}
.mobile-menu.open {
  max-height: 400px;
  padding: 20px 24px;
  border-bottom-color: var(--clr-border);
}
.mobile-menu a {
  padding: 12px 0;
  font-size: 1rem;
  font-weight: 500;
  color: var(--clr-text);
  border-bottom: 1px solid rgba(255,255,255,0.03);
}

/* ─── Hero Section ──────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--grad-hero);
  position: relative;
  overflow: hidden;
  padding-top: 72px;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-glow);
  pointer-events: none;
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,230,184,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,230,184,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
  padding: 80px 0;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0,230,184,0.08);
  border: 1px solid rgba(0,230,184,0.2);
  color: var(--clr-primary);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 7px 16px;
  border-radius: 99px;
  margin-bottom: 32px;
}
.hero-badge .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--clr-primary);
  animation: pulse 2s infinite;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}
.hero-title .highlight {
  color: var(--clr-primary);
  position: relative;
}
.hero-title .highlight::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--clr-primary), transparent);
  border-radius: 99px;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--clr-muted);
  max-width: 560px;
  line-height: 1.75;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.hero-stats {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}
.stat-item { display: flex; flex-direction: column; gap: 2px; }
.stat-number {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--clr-text);
}
.stat-number span { color: var(--clr-primary); }
.stat-label { font-size: 0.8rem; color: var(--clr-muted); font-weight: 500; }

/* ─── Cards ─────────────────────────────────────────────────── */
.card {
  background: var(--grad-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,230,184,0.4), transparent);
  opacity: 0;
  transition: var(--transition);
}
.card:hover {
  border-color: var(--clr-border-hover);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4), 0 0 30px rgba(0,230,184,0.06);
}
.card:hover::before { opacity: 1; }

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  background: var(--clr-primary-dim);
  border: 1px solid rgba(0,230,184,0.15);
}

.card-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--clr-text);
}
.card-text { font-size: 0.9rem; color: var(--clr-muted); line-height: 1.7; }

/* ─── Sections ──────────────────────────────────────────────── */
.section { padding: 100px 0; }
.section-header { margin-bottom: 56px; }

/* ─── Features Grid ─────────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

/* ─── Course Cards ──────────────────────────────────────────── */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.course-card {
  background: var(--grad-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}
.course-card:hover {
  border-color: var(--clr-border-hover);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4), 0 0 30px rgba(0,230,184,0.06);
}

.course-card-header {
  padding: 28px 28px 20px;
  background: linear-gradient(135deg, rgba(0,230,184,0.06) 0%, rgba(59,130,246,0.04) 100%);
  border-bottom: 1px solid var(--clr-border);
  display: flex;
  align-items: flex-start;
  gap: 16px;
}
.course-card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: var(--clr-primary-dim);
  border: 1px solid rgba(0,230,184,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}
.course-card-meta h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
}
.course-level {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 99px;
  display: inline-block;
}
.level-beginner { background: rgba(0,230,184,0.12); color: var(--clr-primary); }
.level-intermediate { background: rgba(59,130,246,0.12); color: #60a5fa; }
.level-advanced { background: rgba(139,92,246,0.12); color: #a78bfa; }

.course-card-body { padding: 20px 28px 28px; }
.course-card-body p { font-size: 0.9rem; color: var(--clr-muted); margin-bottom: 20px; line-height: 1.7; }

.course-info {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
  font-size: 0.82rem;
  color: var(--clr-muted);
}
.course-info-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

/* ─── Online Classes ─────────────────────────────────────────── */
.classes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.class-card {
  background: var(--grad-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.class-card:hover {
  border-color: var(--clr-border-hover);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}

.class-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 99px;
  width: fit-content;
}
.status-live {
  background: rgba(239,68,68,0.12);
  color: #f87171;
  border: 1px solid rgba(239,68,68,0.2);
}
.status-live::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #f87171;
  animation: pulse 1.5s infinite;
}
.status-upcoming {
  background: rgba(59,130,246,0.12);
  color: #60a5fa;
  border: 1px solid rgba(59,130,246,0.2);
}
.status-upcoming::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #60a5fa;
}

.class-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
}
.class-instructor {
  font-size: 0.85rem;
  color: var(--clr-muted);
}
.class-time {
  font-size: 0.82rem;
  color: var(--clr-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ─── Contact Section ───────────────────────────────────────── */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 60px;
  align-items: start;
}

.contact-info h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.contact-info p {
  color: var(--clr-muted);
  font-size: 0.95rem;
  line-height: 1.75;
  margin-bottom: 36px;
}

.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 24px;
}
.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--clr-primary-dim);
  border: 1px solid rgba(0,230,184,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.contact-detail strong {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 3px;
}
.contact-detail span {
  font-size: 0.85rem;
  color: var(--clr-muted);
}

/* ─── Form ──────────────────────────────────────────────────── */
.contact-form {
  background: var(--grad-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  padding: 40px;
}
.contact-form h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 28px;
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}
.form-group label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--clr-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.form-group input,
.form-group textarea,
.form-group select {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  padding: 13px 16px;
  font-size: 0.9rem;
  color: var(--clr-text);
  font-family: var(--font-main);
  transition: var(--transition);
  outline: none;
  width: 100%;
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--clr-subtle);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: rgba(0,230,184,0.4);
  background: rgba(0,230,184,0.03);
  box-shadow: 0 0 0 3px rgba(0,230,184,0.08);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-group select option { background: var(--clr-surface-2); }

/* ─── Page Hero (inner pages) ───────────────────────────────── */
.page-hero {
  padding: 140px 0 80px;
  background: var(--grad-hero);
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-glow);
  pointer-events: none;
}
.page-hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,230,184,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,230,184,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}
.page-hero-content { position: relative; z-index: 1; }
.page-hero-content h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  margin-bottom: 12px;
}
.page-hero-content p {
  font-size: 1.05rem;
  color: var(--clr-muted);
  max-width: 540px;
}

/* ─── Footer ────────────────────────────────────────────────── */
#footer {
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--clr-border);
}

.footer-brand p {
  font-size: 0.88rem;
  color: var(--clr-muted);
  margin-top: 14px;
  line-height: 1.75;
  max-width: 280px;
}

.footer-col h4 {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-muted);
  margin-bottom: 20px;
}
.footer-col a {
  display: block;
  font-size: 0.875rem;
  color: var(--clr-muted);
  margin-bottom: 10px;
  transition: var(--transition);
}
.footer-col a:hover { color: var(--clr-primary); transform: translateX(4px); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 30px;
  font-size: 0.82rem;
  color: var(--clr-subtle);
}
.footer-bottom a { color: var(--clr-muted); transition: var(--transition); }
.footer-bottom a:hover { color: var(--clr-primary); }

/* ─── Alert Banner ──────────────────────────────────────────── */
.alert-bar {
  background: linear-gradient(90deg, rgba(0,230,184,0.08), rgba(59,130,246,0.06));
  border: 1px solid rgba(0,230,184,0.15);
  border-radius: var(--radius-md);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 40px;
  font-size: 0.9rem;
}
.alert-bar strong { color: var(--clr-primary); }
.alert-bar span { color: var(--clr-muted); }

/* ─── Divider ───────────────────────────────────────────────── */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--clr-border), transparent);
  margin: 0;
}

/* ─── Responsive ────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-layout { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links, .nav-cta { display: none; }
  .hamburger { display: flex; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .hero-stats { gap: 24px; }
  .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
}