/* ==========================================================================
   HP2 - Planetensuche & Exoplaneten Research Hub
   Design System & Styling Rules
   Theme: Cosmic Dark Mode / Glassmorphism / Vibrant Astronomy Accents
   ========================================================================== */

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

:root {
  --bg-dark: #070913;
  --bg-card: rgba(15, 20, 38, 0.75);
  --bg-card-hover: rgba(24, 32, 60, 0.88);
  --glass-border: rgba(0, 240, 255, 0.15);
  --glass-border-hover: rgba(0, 240, 255, 0.4);
  
  --accent-cyan: #00f0ff;
  --accent-cyan-glow: rgba(0, 240, 255, 0.3);
  --accent-purple: #9d4edd;
  --accent-purple-glow: rgba(157, 78, 221, 0.3);
  --accent-gold: #ffb703;
  --accent-green: #2ec4b6;
  
  --text-main: #e2e8f0;
  --text-muted: #94a3b8;
  --text-bright: #ffffff;
  
  --font-heading: 'Orbitron', sans-serif;
  --font-subheading: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-glow: 0 0 25px rgba(0, 240, 255, 0.15);
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.5);
  
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Background Canvas & Ambient Overlay */
#starfield {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -2;
  pointer-events: none;
}

.cosmic-ambient {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  background: 
    radial-gradient(circle at 15% 20%, rgba(157, 78, 221, 0.18) 0%, transparent 45%),
    radial-gradient(circle at 85% 60%, rgba(0, 240, 255, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 50% 90%, rgba(255, 183, 3, 0.08) 0%, transparent 40%);
  pointer-events: none;
}

/* Typography */
h1, h2, h3, h4, .brand-logo {
  font-family: var(--font-heading);
  letter-spacing: 0.5px;
  color: var(--text-bright);
}

h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #ffffff 0%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

h3 {
  font-size: 1.35rem;
  color: var(--accent-cyan);
  margin-bottom: 0.75rem;
}

p {
  margin-bottom: 1rem;
  color: var(--text-muted);
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--text-bright);
  text-shadow: 0 0 8px var(--accent-cyan-glow);
}

/* Glassmorphism Containers */
.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: 1.75rem;
  transition: all var(--transition-normal);
}

.glass-panel:hover {
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

/* Header & Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(7, 9, 19, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  padding: 0.85rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px var(--accent-cyan-glow);
  font-size: 1.2rem;
}

.brand-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-bright);
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--accent-cyan);
  font-family: var(--font-subheading);
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  list-style: none;
}

.nav-link {
  font-family: var(--font-subheading);
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-muted);
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--accent-cyan);
  background: rgba(0, 240, 255, 0.08);
}

.lang-switch {
  display: flex;
  gap: 0.25rem;
  background: rgba(255, 255, 255, 0.05);
  padding: 3px;
  border-radius: var(--radius-full);
  border: 1px solid var(--glass-border);
}

.lang-btn {
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  background: transparent;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.lang-btn.active {
  background: var(--accent-cyan);
  color: #000;
  box-shadow: 0 0 10px var(--accent-cyan-glow);
}

/* Layout Container */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Hero Section */
.hero {
  position: relative;
  padding: 4rem 2rem;
  margin-bottom: 3rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(135deg, rgba(15, 20, 38, 0.92) 0%, rgba(7, 9, 19, 0.88) 100%),
              radial-gradient(ellipse at 80% 50%, rgba(0, 240, 255, 0.25) 0%, rgba(157, 78, 221, 0.2) 40%, transparent 70%);
  border: 1px solid var(--glass-border);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
}

.hero-content {
  max-width: 780px;
  position: relative;
  z-index: 2;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  background: rgba(0, 240, 255, 0.12);
  border: 1px solid var(--accent-cyan);
  border-radius: var(--radius-full);
  color: var(--accent-cyan);
  font-size: 0.8rem;
  font-family: var(--font-subheading);
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.hero-title {
  font-size: 2.6rem;
  line-height: 1.18;
  margin-bottom: 1.25rem;
  text-shadow: 0 5px 15px rgba(0, 0, 0, 0.8);
}

.hero-desc {
  font-size: 1.05rem;
  color: #cbd5e1;
  margin-bottom: 2rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}

.stat-card {
  background: rgba(7, 9, 19, 0.7);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 1rem;
  text-align: center;
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 1.7rem;
  color: var(--accent-cyan);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Button Component */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-family: var(--font-subheading);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), #00a6ff);
  color: #000;
  box-shadow: 0 4px 20px var(--accent-cyan-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(0, 240, 255, 0.5);
  color: #000;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-bright);
  border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
  background: rgba(0, 240, 255, 0.15);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* Feature Grid */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
  margin-bottom: 2.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

/* Data Tables */
.table-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.search-input {
  background: rgba(7, 9, 19, 0.8);
  border: 1px solid var(--glass-border);
  color: var(--text-bright);
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.9rem;
  width: 280px;
  transition: border var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan-glow);
}

.table-wrapper {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
}

.glass-table,
.exo-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.88rem;
}

.glass-table th,
.exo-table th {
  background: rgba(15, 20, 38, 0.95);
  color: var(--accent-cyan);
  font-family: var(--font-subheading);
  font-weight: 600;
  padding: 0.9rem 1rem;
  border-bottom: 2px solid var(--glass-border);
  white-space: nowrap;
}

.glass-table td,
.exo-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  vertical-align: middle;
}

.glass-table tbody tr,
.exo-table tbody tr {
  transition: background var(--transition-fast);
}

.glass-table tbody tr:hover,
.exo-table tbody tr:hover {
  background: rgba(0, 240, 255, 0.04);
}

.pill {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.pill-hz-yes {
  background: rgba(46, 196, 182, 0.15);
  color: #2ec4b6;
  border: 1px solid #2ec4b6;
}

.pill-hz-no {
  background: rgba(239, 68, 68, 0.12);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.pill-type {
  background: rgba(157, 78, 221, 0.15);
  color: #c77dff;
  border: 1px solid rgba(157, 78, 221, 0.4);
}

/* Lightbox Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(12px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.modal.active {
  display: flex;
}

.modal-content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: 0 0 50px rgba(0, 240, 255, 0.2);
}

.modal-img {
  max-width: 100%;
  max-height: 75vh;
  border-radius: var(--radius-sm);
  display: block;
  margin: 0 auto;
}

.modal-caption {
  margin-top: 1rem;
  text-align: center;
  color: var(--accent-cyan);
  font-family: var(--font-subheading);
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: #fff;
  font-size: 1.5rem;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--accent-cyan);
  color: #000;
}

/* Tabs System */
.tab-header {
  display: flex;
  gap: 0.75rem;
  border-bottom: 1px solid var(--glass-border);
  margin-bottom: 1.5rem;
}

.tab-btn {
  padding: 0.65rem 1.25rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-subheading);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
}

.tab-btn:hover, .tab-btn.active {
  color: var(--accent-cyan);
  border-bottom-color: var(--accent-cyan);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Footer */
footer {
  margin-top: 4rem;
  background: rgba(5, 7, 15, 0.95);
  border-top: 1px solid var(--glass-border);
  padding: 3rem 2rem 2rem;
  text-align: center;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto 2.5rem;
  text-align: left;
}

.footer-col h4 {
  color: var(--accent-cyan);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-links a:hover {
  color: var(--accent-cyan);
}

.copyright {
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 1.5rem;
}

/* Gallery Grid */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.gallery-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.gallery-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-glow);
}

.gallery-thumb {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
}

.gallery-info {
  padding: 1rem;
}

.gallery-title {
  font-size: 0.95rem;
  color: var(--text-bright);
  font-family: var(--font-subheading);
  margin-bottom: 0.25rem;
}

.gallery-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}