/* ==========================================================================
   thpp.de | Premier Front-End Engineering & Visual Architecture Showcase
   Theme: Ice-Blue Glassmorphism & Modern Editorial Neo-Brutalism
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design System Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette - Ice, Pale Blue & Deep Slate */
  --bg-canvas: #F0F6FA;
  --bg-gradient-top: #F6FAFD;
  --bg-gradient-mid: #E3EFF6;
  --bg-gradient-bot: #D5E6F0;
  
  --text-main: #0F172A;
  --text-body: #334155;
  --text-muted: #64748B;
  
  --brand-primary: #0284C7;
  --brand-secondary: #0369A1;
  --brand-light: #E0F2FE;
  --brand-glow: rgba(2, 132, 199, 0.28);
  
  --glass-surface: rgba(255, 255, 255, 0.75);
  --glass-border: rgba(255, 255, 255, 0.95);
  --glass-shadow: 0 20px 40px -15px rgba(148, 163, 184, 0.22);
  
  --card-hover-border: rgba(2, 132, 199, 0.45);
  --card-hover-shadow: 0 30px 60px -12px rgba(2, 132, 199, 0.2);
  
  --nav-bg: rgba(240, 246, 250, 0.85);
  --border-subtle: #CBD5E1;
  
  --radius-xl: 24px;
  --radius-lg: 16px;
  --radius-pill: 9999px;
  
  --easing-swift: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-swift: all 0.35s var(--easing-swift);
}

[data-theme="dark"] {
  --bg-canvas: #090D16;
  --bg-gradient-top: #090D16;
  --bg-gradient-mid: #0F172A;
  --bg-gradient-bot: #1E293B;
  
  --text-main: #F8FAFC;
  --text-body: #CBD5E1;
  --text-muted: #94A3B8;
  
  --brand-primary: #38BDF8;
  --brand-secondary: #0284C7;
  --brand-light: #1E293B;
  --brand-glow: rgba(56, 189, 248, 0.35);
  
  --glass-surface: rgba(15, 23, 42, 0.78);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.65);
  
  --card-hover-border: rgba(56, 189, 248, 0.55);
  --card-hover-shadow: 0 30px 60px -12px rgba(56, 189, 248, 0.28);
  
  --nav-bg: rgba(9, 13, 22, 0.88);
  --border-subtle: #334155;
}

/* --------------------------------------------------------------------------
   2. Base Reset & Layout Engine
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  background: radial-gradient(circle at 50% -20%, var(--bg-gradient-top), var(--bg-gradient-mid), var(--bg-canvas));
  background-attachment: fixed;
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Plus Jakarta Sans", "Inter", system-ui, sans-serif;
  line-height: 1.8;
  letter-spacing: -0.015em;
  min-height: 100vh;
  transition: var(--transition-swift);
  overflow-x: hidden;
}

/* --------------------------------------------------------------------------
   3. Fluid Typography System
   -------------------------------------------------------------------------- */
h1, h2, h3, h4 {
  font-family: "Playfair Display", Georgia, serif;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.18;
  letter-spacing: -0.025em;
}

h1 { font-size: clamp(2.75rem, 6vw, 4.5rem); }
h2 { font-size: clamp(2rem, 4vw, 3.25rem); }
h3 { font-size: clamp(1.35rem, 2.5vw, 2rem); }
h4 { font-size: clamp(1.1rem, 1.8vw, 1.35rem); }

p {
  margin-bottom: 1.5rem;
  color: var(--text-body);
  font-size: 1.1rem;
}

ul, ol {
  margin-bottom: 1.75rem;
  padding-left: 1.5rem;
  color: var(--text-body);
}

li {
  margin-bottom: 0.75rem;
  font-size: 1.05rem;
}

a {
  color: var(--brand-primary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition-swift);
}

a:hover {
  color: var(--brand-secondary);
}

/* --------------------------------------------------------------------------
   4. Accessibility & Focus States
   -------------------------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: -120px;
  left: 1.5rem;
  background: var(--brand-primary);
  color: #FFFFFF;
  padding: 1rem 2rem;
  font-weight: 700;
  border-radius: 12px;
  z-index: 1000;
  box-shadow: 0 10px 25px var(--brand-glow);
  transition: top 0.3s ease;
}
.skip-link:focus { top: 1.5rem; }

:focus-visible {
  outline: 3px solid var(--brand-primary);
  outline-offset: 4px;
}

/* --------------------------------------------------------------------------
   5. Glassmorphic Navigation Header
   -------------------------------------------------------------------------- */
header {
  position: sticky;
  top: 0;
  background: var(--nav-bg);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 100;
  padding: 1.25rem 6%;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1300px;
  margin: 0 auto;
  gap: 1.5rem;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo {
  font-size: 1.85rem;
  font-family: "Playfair Display", Georgia, serif;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.03em;
}

.logo span {
  color: var(--brand-primary);
}

.nav-links {
  display: flex;
  gap: 1.25rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-body);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-pill);
  transition: var(--transition-swift);
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--brand-primary);
  background: rgba(2, 132, 199, 0.1);
}

.theme-toggle-btn {
  background: var(--glass-surface);
  border: 1px solid var(--border-subtle);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-pill);
  color: var(--text-main);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-swift);
}

.theme-toggle-btn:hover {
  border-color: var(--brand-primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px var(--brand-glow);
}

/* --------------------------------------------------------------------------
   6. Hero & Visual Banner Components
   -------------------------------------------------------------------------- */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3.5rem 6%;
}

.hero {
  text-align: center;
  padding: 4.5rem 0 3rem 0;
  max-width: 900px;
  margin: 0 auto;
}

.hero-short {
  padding: 3rem 0 1.5rem 0;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(2, 132, 199, 0.1);
  color: var(--brand-primary);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.4rem 1.25rem;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(2, 132, 199, 0.25);
}

.hero p {
  font-size: 1.3rem;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: 2.5rem;
}

/* --------------------------------------------------------------------------
   7. Glassmorphic Data Cards & Dynamic Grid
   -------------------------------------------------------------------------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr));
  gap: 2.5rem;
  margin: 3.5rem 0;
}

.card {
  background: var(--glass-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  box-shadow: var(--glass-shadow);
  transition: var(--transition-swift);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, transparent, var(--brand-primary), transparent);
  opacity: 0;
  transition: var(--transition-swift);
}

.card:hover {
  transform: translateY(-6px);
  border-color: var(--card-hover-border);
  box-shadow: var(--card-hover-shadow);
}

.card:hover::before {
  opacity: 1;
}

.card-tag {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--brand-primary);
  margin-bottom: 0.75rem;
  display: block;
}

/* --------------------------------------------------------------------------
   8. Botanical Line-Art Separators & Flourishes
   -------------------------------------------------------------------------- */
.botanical-divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
  margin: 4.5rem 0;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.botanical-divider::after {
  content: '🌿';
  font-size: 1.25rem;
  background: var(--bg-canvas);
  padding: 0 1.25rem;
  color: var(--brand-primary);
}

/* --------------------------------------------------------------------------
   9. Buttons & Interactive Controls
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  background: var(--brand-primary);
  color: #FFFFFF !important;
  font-weight: 700;
  font-size: 1.05rem;
  padding: 1rem 2.5rem;
  border-radius: var(--radius-pill);
  transition: var(--transition-swift);
  box-shadow: 0 10px 25px var(--brand-glow);
  border: none;
  cursor: pointer;
}

.btn:hover {
  background: var(--brand-secondary);
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 15px 35px var(--brand-glow);
}

/* --------------------------------------------------------------------------
   10. Responsive Media Queries (RWD)
   -------------------------------------------------------------------------- */
@media (max-width: 900px) {
  nav {
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
  }
  .logo-group {
    justify-content: space-between;
  }
  .nav-links {
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
  }
  .nav-links a {
    font-size: 0.875rem;
    padding: 0.4rem 0.75rem;
  }
}

@media (max-width: 600px) {
  main {
    padding: 2rem 4%;
  }
  .hero {
    padding: 2.5rem 0 1.5rem 0;
  }
  .card {
    padding: 1.75rem;
  }
  .btn {
    width: 100%;
  }
}