/* ============================================================
   DESIGN TOKENS — itprocast.live
   Palette: Clean & professional — deep navy authority, electric blue accent
   Fonts: Cabinet Grotesk (display) + Satoshi (body)
   ============================================================ */

:root, [data-theme='light'] {
  /* Surfaces */
  --color-bg: #f5f7fa;
  --color-surface: #ffffff;
  --color-surface-2: #f0f4f8;
  --color-surface-offset: #e8edf3;
  --color-surface-dynamic: #dde4ed;
  --color-divider: #d0d8e4;
  --color-border: #c4ceda;

  /* Text */
  --color-text: #0f1923;
  --color-text-muted: #4a5668;
  --color-text-faint: #8a97a8;
  --color-text-inverse: #f5f7fa;

  /* Primary — electric blue */
  --color-primary: #1a6fd4;
  --color-primary-hover: #1558b0;
  --color-primary-active: #0f418a;
  --color-primary-highlight: #d0e4f7;

  /* Accent — navy */
  --color-navy: #0f1923;
  --color-navy-light: #1e3050;

  /* Success */
  --color-success: #1a8c56;
  --color-success-highlight: #d0ede0;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Shadows */
  --shadow-sm: 0 1px 3px oklch(0.2 0.06 240 / 0.08);
  --shadow-md: 0 4px 16px oklch(0.2 0.06 240 / 0.10);
  --shadow-lg: 0 12px 40px oklch(0.2 0.06 240 / 0.14);
  --shadow-xl: 0 24px 64px oklch(0.2 0.06 240 / 0.18);

  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(3rem, 0.5rem + 7vw, 7rem);

  /* Spacing */
  --space-1: 0.25rem; --space-2: 0.5rem; --space-3: 0.75rem;
  --space-4: 1rem; --space-5: 1.25rem; --space-6: 1.5rem;
  --space-8: 2rem; --space-10: 2.5rem; --space-12: 3rem;
  --space-16: 4rem; --space-20: 5rem; --space-24: 6rem;
  --space-32: 8rem;

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Fonts */
  --font-display: 'Cabinet Grotesk', 'Helvetica Neue', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;
}

[data-theme='dark'] {
  --color-bg: #0a0f16;
  --color-surface: #111820;
  --color-surface-2: #161e28;
  --color-surface-offset: #1a2230;
  --color-surface-dynamic: #202b3a;
  --color-divider: #1e2a3a;
  --color-border: #2a3a50;
  --color-text: #e2e8f0;
  --color-text-muted: #8fa3be;
  --color-text-faint: #4a5f78;
  --color-text-inverse: #0a0f16;
  --color-primary: #4d9de0;
  --color-primary-hover: #6ab0ea;
  --color-primary-active: #87c3f4;
  --color-primary-highlight: #1a2d42;
  --color-navy: #e2e8f0;
  --color-navy-light: #a8c0d8;
  --color-success: #34c27a;
  --color-success-highlight: #0e2a1c;
  --shadow-sm: 0 1px 3px oklch(0 0 0 / 0.3);
  --shadow-md: 0 4px 16px oklch(0 0 0 / 0.4);
  --shadow-lg: 0 12px 40px oklch(0 0 0 / 0.5);
  --shadow-xl: 0 24px 64px oklch(0 0 0 / 0.6);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0a0f16;
    --color-surface: #111820;
    --color-surface-2: #161e28;
    --color-surface-offset: #1a2230;
    --color-surface-dynamic: #202b3a;
    --color-divider: #1e2a3a;
    --color-border: #2a3a50;
    --color-text: #e2e8f0;
    --color-text-muted: #8fa3be;
    --color-text-faint: #4a5f78;
    --color-text-inverse: #0a0f16;
    --color-primary: #4d9de0;
    --color-primary-hover: #6ab0ea;
    --color-primary-active: #87c3f4;
    --color-primary-highlight: #1a2d42;
    --color-navy: #e2e8f0;
    --color-navy-light: #a8c0d8;
    --color-success: #34c27a;
    --color-success-highlight: #0e2a1c;
    --shadow-sm: 0 1px 3px oklch(0 0 0 / 0.3);
    --shadow-md: 0 4px 16px oklch(0 0 0 / 0.4);
    --shadow-lg: 0 12px 40px oklch(0 0 0 / 0.5);
    --shadow-xl: 0 24px 64px oklch(0 0 0 / 0.6);
  }
}

/* ============================================================
   LAYOUT UTILITIES
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-4), 5vw, var(--space-12));
}
.container--narrow { max-width: var(--content-default); }

/* ============================================================
   HEADER / NAV
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-interactive);
}
.site-header.scrolled { box-shadow: var(--shadow-md); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}
.nav-logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
}
.nav-logo-text span { color: var(--color-primary); }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}
.nav-links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  padding-block: var(--space-2);
}
.nav-links a:hover { color: var(--color-text); }
.nav-links a.active { color: var(--color-primary); }

.nav-actions { display: flex; align-items: center; gap: var(--space-3); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all var(--transition-interactive);
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--color-primary-hover); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1.5px solid var(--color-border);
}
.btn-ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  background: var(--color-surface-offset);
  border: 1.5px solid var(--color-border);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-interactive);
}
.theme-toggle:hover { color: var(--color-primary); border-color: var(--color-primary); }

/* Mobile menu */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
}
.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all 0.3s;
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(var(--space-20), 12vw, var(--space-32));
  background: var(--color-bg);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 60% 40%, oklch(from var(--color-primary) l c h / 0.08) 0%, transparent 70%),
              radial-gradient(ellipse 40% 40% at 85% 20%, oklch(from var(--color-primary) l c h / 0.05) 0%, transparent 60%);
  pointer-events: none;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-6);
}
.live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ef4444;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.85); }
}
.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text);
  line-height: 1.05;
  margin-bottom: var(--space-6);
}
.hero-title .accent { color: var(--color-primary); }
.hero-subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-8);
  max-width: 52ch;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-4); align-items: center; }

.hero-visual {
  position: relative;
}
.screen-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}
.screen-bar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  background: var(--color-surface-offset);
  border-bottom: 1px solid var(--color-border);
}
.screen-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.screen-content {
  padding: var(--space-6);
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--text-xs);
  line-height: 1.8;
  color: var(--color-text-muted);
  min-height: 200px;
  background: var(--color-surface-2);
}
.screen-content .line { display: block; }
.screen-content .cmd { color: var(--color-primary); }
.screen-content .ok { color: var(--color-success); }
.screen-content .comment { color: var(--color-text-faint); }

.badge-live {
  position: absolute;
  top: -12px;
  right: -12px;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: #ef4444;
  color: #fff;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-md);
}

.stat-strip {
  display: flex;
  gap: var(--space-8);
  margin-top: var(--space-8);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
}
.stat-item {}
.stat-value {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
}
.stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: var(--space-1);
}

/* ============================================================
   SECTION STYLES
   ============================================================ */
.section { padding-block: clamp(var(--space-16), 8vw, var(--space-24)); }
.section-label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}
.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text);
  line-height: 1.1;
  margin-bottom: var(--space-4);
}
.section-sub {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 60ch;
  margin-bottom: var(--space-12);
}

/* What You'll Learn — card grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}
.card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: box-shadow var(--transition-interactive), transform var(--transition-interactive), border-color var(--transition-interactive);
}
.card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); border-color: var(--color-primary); }
.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  background: var(--color-primary-highlight);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  color: var(--color-primary);
}
.card-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}
.card-body { font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.7; }

/* CTA Banner */
.cta-banner {
  background: var(--color-navy);
  border-radius: var(--radius-2xl);
  padding: clamp(var(--space-10), 6vw, var(--space-16));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  flex-wrap: wrap;
  position: relative;
  overflow: hidden;
}
[data-theme='light'] .cta-banner, :root:not([data-theme]) .cta-banner {
  background: #0f1923;
}
[data-theme='dark'] .cta-banner {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
}
.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 80% at 80% 50%, oklch(from var(--color-primary) l c h / 0.15) 0%, transparent 70%);
  pointer-events: none;
}
.cta-banner-text .section-label { color: #4d9de0; }
.cta-banner-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.03em;
  line-height: 1.1;
}
[data-theme='dark'] .cta-banner-title { color: var(--color-text); }
.cta-banner-sub {
  font-size: var(--text-base);
  color: #8fa3be;
  margin-top: var(--space-3);
  max-width: 48ch;
}
.btn-white {
  background: #fff;
  color: #0f1923;
  font-weight: 700;
}
.btn-white:hover { background: #e2e8f0; transform: translateY(-1px); box-shadow: var(--shadow-md); }

/* Schedule table */
.schedule-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
}
.schedule-table th {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: var(--space-4) var(--space-6);
  text-align: left;
  border-bottom: 2px solid var(--color-border);
}
.schedule-table td {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-divider);
  font-size: var(--text-sm);
  color: var(--color-text);
  vertical-align: middle;
}
.schedule-table tr:last-child td { border-bottom: none; }
.schedule-table tr:hover td { background: var(--color-surface-offset); }
.topic-badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  background: var(--color-primary-highlight);
  color: var(--color-primary);
}
.topic-badge.network { background: oklch(0.85 0.08 240 / 0.3); color: #0066aa; }
.topic-badge.security { background: oklch(0.85 0.08 140 / 0.3); color: #1a6a3a; }
.topic-badge.aplus { background: oklch(0.85 0.08 50 / 0.3); color: #8a5500; }
[data-theme='dark'] .topic-badge.network { background: oklch(0.25 0.08 240 / 0.5); color: #6ab0ea; }
[data-theme='dark'] .topic-badge.security { background: oklch(0.25 0.08 140 / 0.5); color: #34c27a; }
[data-theme='dark'] .topic-badge.aplus { background: oklch(0.25 0.08 50 / 0.5); color: #fdab43; }

/* About page */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-16); align-items: start; }
.about-img {
  border-radius: var(--radius-2xl);
  background: var(--color-surface-offset);
  aspect-ratio: 4/5;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 1.5px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
}
.cert-badges { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-8); }
.cert-badge {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
}

/* Contact form */
.form-grid { display: grid; gap: var(--space-5); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-5); }
.form-group { display: flex; flex-direction: column; gap: var(--space-2); }
.form-label { font-size: var(--text-sm); font-weight: 600; color: var(--color-text); }
.form-input, .form-textarea {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--text-base);
  outline: none;
}
.form-input:focus, .form-textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-highlight);
}
.form-textarea { resize: vertical; min-height: 140px; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-12);
  background: var(--color-surface);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-6);
}
.footer-copy { font-size: var(--text-xs); color: var(--color-text-faint); }
.footer-links { display: flex; gap: var(--space-6); }
.footer-links a {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-decoration: none;
}
.footer-links a:hover { color: var(--color-primary); }

/* ============================================================
   PAGE HERO (inner pages)
   ============================================================ */
.page-hero {
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .about-grid { grid-template-columns: 1fr; }
  .about-img { aspect-ratio: 16/9; }
  .cta-banner { flex-direction: column; text-align: center; }
  .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    inset: 0;
    top: 65px;
    background: var(--color-bg);
    padding: var(--space-8);
    gap: var(--space-6);
    z-index: 99;
    align-items: center;
    font-size: var(--text-lg);
  }
  .menu-toggle { display: flex; }
  .nav-actions .btn-primary { display: none; }
  .stat-strip { gap: var(--space-6); }
}