/* ═══════════════════════════════════════════════
   DESIGN TOKENS
═══════════════════════════════════════════════ */
:root {
  --c-bg: #0b0f1a;
  --c-bg2: #111827;
  --c-surface: rgba(255, 255, 255, 0.04);
  --c-surface-h: rgba(255, 255, 255, 0.08);
  --c-border: rgba(255, 255, 255, 0.08);
  --c-border-h: rgba(99, 179, 237, 0.4);

  --c-primary: #38bdf8;
  --c-primary-d: #0ea5e9;
  --c-accent: #818cf8;
  --c-text: #e2e8f0;
  --c-muted: #94a3b8;
  --c-danger: #f87171;
  --c-warn: #fbbf24;

  --grad-hero: linear-gradient(135deg, #1e3a5f 0%, #0f172a 60%);
  --grad-text: linear-gradient(90deg, #38bdf8, #818cf8);
  --grad-card: linear-gradient(145deg, rgba(56, 189, 248, .15), rgba(129, 140, 248, .08));

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;

  --shadow-card: 0 4px 32px rgba(0, 0, 0, .45), 0 0 0 1px rgba(255, 255, 255, .06);
  --shadow-glow: 0 0 30px rgba(56, 189, 248, .2);

  --ff-sans: 'Inter', system-ui, sans-serif;
  --ff-mono: 'JetBrains Mono', monospace;

  --transition: .25s cubic-bezier(.4, 0, .2, 1);
}

/* ═══════════════════════════════════════════════
   RESET & BASE
═══════════════════════════════════════════════ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--ff-sans);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.7;
  overflow-x: hidden;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--c-bg);
}

::-webkit-scrollbar-thumb {
  background: #334155;
  border-radius: 3px;
}

img {
  max-width: 100%;
  display: block;
}

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

address {
  font-style: normal;
}

/* ═══════════════════════════════════════════════
   LAYOUT
═══════════════════════════════════════════════ */
.container {
  max-width: 1160px;
  margin-inline: auto;
  padding-inline: clamp(16px, 5vw, 48px);
}

/* ═══════════════════════════════════════════════
   NAVIGATION
═══════════════════════════════════════════════ */
.site-header {
  background: var(--grad-hero);
  position: relative;
  overflow: hidden;
}

/* decorative blobs */
.site-header::before,
.site-header::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
  opacity: .45;
}

.site-header::before {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #0ea5e9 0%, transparent 70%);
  top: -200px;
  right: -150px;
}

.site-header::after {
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, #818cf8 0%, transparent 70%);
  bottom: -120px;
  left: -100px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-block: 20px;
  position: relative;
  z-index: 10;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -.3px;
  white-space: nowrap;
}

.nav-icon {
  font-size: 1.5rem;
}

.accent {
  color: var(--c-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin-left: auto;
}

.nav-links a {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  font-weight: 500;
  color: var(--c-muted);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover {
  color: var(--c-text);
  background: var(--c-surface);
}

.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  margin-left: auto;
}

.nav-burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--c-text);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

/* ═══════════════════════════════════════════════
   BUTTONS
═══════════════════════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-family: var(--ff-sans);
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-d));
  color: #020617;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(56, 189, 248, .35);
}

.btn-outline {
  background: transparent;
  color: var(--c-primary);
  border: 1.5px solid var(--c-primary);
}

.btn-outline:hover {
  background: rgba(56, 189, 248, .1);
  transform: translateY(-2px);
}

.btn-ghost {
  background: var(--c-surface);
  color: var(--c-text);
  border: 1.5px solid var(--c-border);
}

.btn-ghost:hover {
  background: var(--c-surface-h);
  border-color: var(--c-border-h);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 7px 16px;
  font-size: .82rem;
}

.icon-github {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ═══════════════════════════════════════════════
   HERO
═══════════════════════════════════════════════ */
.hero {
  position: relative;
  z-index: 5;
  padding-block: clamp(60px, 10vw, 120px) clamp(60px, 8vw, 100px);
  text-align: center;
}

.hero-badge {
  display: inline-block;
  background: rgba(56, 189, 248, .12);
  border: 1px solid rgba(56, 189, 248, .3);
  color: var(--c-primary);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 5px 16px;
  border-radius: 999px;
  margin-bottom: 28px;
}

.hero-title {
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -.5px;
  margin-bottom: 20px;
}

.gradient-text {
  background: var(--grad-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  max-width: 560px;
  margin-inline: auto;
  color: var(--c-muted);
  font-size: 1.05rem;
  margin-bottom: 36px;
}

.hero-link {
  color: var(--c-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(56, 189, 248, .4);
  transition: color var(--transition), text-decoration-color var(--transition);
}

.hero-link:hover {
  color: #7dd3fc;
  text-decoration-color: rgba(56, 189, 248, .8);
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

.hero-stats {
  display: inline-flex;
  align-items: center;
  gap: 0;
  background: rgba(255, 255, 255, .05);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 20px 36px;
  backdrop-filter: blur(10px);
  gap: 32px;
}

.stat {
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--c-primary);
}

.stat-label {
  display: block;
  font-size: .78rem;
  color: var(--c-muted);
  text-transform: uppercase;
  letter-spacing: .8px;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--c-border);
}

/* ═══════════════════════════════════════════════
   SECTION COMMONS
═══════════════════════════════════════════════ */
.section {
  padding-block: clamp(60px, 8vw, 100px);
}

.section-alt {
  background: var(--c-bg2);
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-badge {
  display: inline-block;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--c-accent);
  background: rgba(129, 140, 248, .1);
  border: 1px solid rgba(129, 140, 248, .25);
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -.3px;
  margin-bottom: 12px;
}

.section-subtitle {
  color: var(--c-muted);
  font-size: 1rem;
}

/* ═══════════════════════════════════════════════
   PROGRAMS GRID
═══════════════════════════════════════════════ */
.programs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

/* ── Program Card ── */
.program-card {
  background: var(--grad-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  cursor: pointer;
  box-shadow: var(--shadow-card);
  animation: fadeUp .5s ease both;
}

.program-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  border-color: var(--c-border-h);
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card-thumb {
  position: relative;
  background: #0f172a;
  aspect-ratio: 16/9;
  overflow: hidden;
}

.card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s ease;
}

.program-card:hover .card-thumb img {
  transform: scale(1.04);
}

.card-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, .35);
  transition: background var(--transition);
}

.program-card:hover .card-play-btn {
  background: rgba(0, 0, 0, .55);
}

.play-circle {
  width: 56px;
  height: 56px;
  background: rgba(56, 189, 248, .9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition), background var(--transition);
  box-shadow: 0 0 24px rgba(56, 189, 248, .4);
}

.program-card:hover .play-circle {
  transform: scale(1.12);
  background: var(--c-primary);
}

.play-circle svg {
  width: 22px;
  height: 22px;
  fill: #020617;
  margin-left: 3px;
}

.card-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .8px;
  text-transform: uppercase;
  background: rgba(11, 15, 26, .75);
  border: 1px solid var(--c-border);
  color: var(--c-primary);
  padding: 3px 10px;
  border-radius: 999px;
  backdrop-filter: blur(8px);
}

.card-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--c-text);
  letter-spacing: -.2px;
}

.card-desc {
  font-size: .88rem;
  color: var(--c-muted);
  line-height: 1.65;
  flex: 1;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--c-border);
}

.card-lang {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .78rem;
  color: var(--c-muted);
  font-family: var(--ff-mono);
}

.lang-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ═══════════════════════════════════════════════
   MODAL
═══════════════════════════════════════════════ */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .75);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.modal-backdrop.open {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: #131c2e;
  border: 1px solid var(--c-border-h);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 720px;
  max-height: 92vh;
  overflow-y: auto;
  transform: scale(.9) translateY(20px);
  transition: transform var(--transition);
  box-shadow: 0 32px 80px rgba(0, 0, 0, .7);
}

.modal-backdrop.open .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 0;
}

.modal-title {
  font-size: 1.2rem;
  font-weight: 700;
}

.modal-close {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  color: var(--c-muted);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  background: var(--c-surface-h);
  color: var(--c-text);
}

.modal-video-wrap {
  position: relative;
  aspect-ratio: 16/9;
  background: #000;
  margin: 18px 24px;
  border-radius: var(--radius);
  overflow: hidden;
}

.modal-iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.modal-body {
  padding: 0 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.modal-description {
  color: var(--c-muted);
  font-size: .92rem;
  line-height: 1.7;
}

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

/* ═══════════════════════════════════════════════
   LICENSE CARD
═══════════════════════════════════════════════ */
.license-card {
  max-width: 740px;
  margin-inline: auto;
  background: var(--grad-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: clamp(28px, 5vw, 48px);
  text-align: center;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.license-icon {
  font-size: 3rem;
}

.license-title {
  font-size: 1.5rem;
  font-weight: 700;
}

.license-text {
  color: var(--c-muted);
  font-size: .93rem;
  line-height: 1.75;
  max-width: 580px;
}


.license-disclaimer {
  background: rgba(251, 191, 36, .08);
  border: 1px solid rgba(251, 191, 36, .25);
  border-radius: var(--radius);
  padding: 18px 22px;
  color: var(--c-muted);
  font-size: .86rem;
  line-height: 1.7;
  text-align: left;
  max-width: 580px;
  width: 100%;
}

.license-disclaimer strong {
  color: var(--c-warn);
}

.license-disclaimer--info {
  background: rgba(56, 189, 248, .08);
  border-color: rgba(56, 189, 248, .25);
}

.license-disclaimer--info strong {
  color: var(--c-primary);
}

/* ═══════════════════════════════════════════════
   FOOTER / IMPRESSUM
═══════════════════════════════════════════════ */
.site-footer {
  background: #070b14;
  border-top: 1px solid var(--c-border);
}

.impressum-section {
  padding-block: 60px 40px;
  border-bottom: 1px solid var(--c-border);
}

.impressum-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 32px;
  color: var(--c-text);
}

.impressum-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
}

.impressum-block h3 {
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--c-primary);
  margin-bottom: 12px;
}

.impressum-block p,
.impressum-block address {
  font-size: .88rem;
  color: var(--c-muted);
  line-height: 1.8;
}

.impressum-note {
  margin-top: 12px;
  font-size: .82rem !important;
  color: #64748b !important;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding-block: 24px;
  font-size: .82rem;
  color: #475569;
}

.footer-links {
  display: flex;
  gap: 16px;
}

.footer-links a {
  color: #475569;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--c-primary);
}

/* ═══════════════════════════════════════════════
   EMPTY / LOADING STATE
═══════════════════════════════════════════════ */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 80px 24px;
  color: var(--c-muted);
}

.empty-state h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
  color: var(--c-text);
}

/* ═══════════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════════ */
@media (max-width: 640px) {
  .nav-links {
    display: none;
  }

  .nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    position: fixed;
    inset: 0;
    background: rgba(11, 15, 26, .97);
    padding: 80px 32px 32px;
    z-index: 100;
    gap: 8px;
  }

  .nav-links.mobile-open a {
    font-size: 1.2rem;
    padding: 12px 0;
    width: 100%;
    border-bottom: 1px solid var(--c-border);
    color: var(--c-text);
  }

  .nav-burger {
    display: flex;
  }

  .nav-burger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-burger.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-burger.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .hero-stats {
    padding: 16px 20px;
    gap: 16px;
  }

  .stat-value {
    font-size: 1.3rem;
  }
}