/* Kubun Notes - Portfolio Landing Page Stylesheet */
@import url('https://fonts.googleapis.com/css2?family=Alegreya:ital,wght@0,400..700;1,400..700&family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
  /* Color Tokens matching Android App Dark Theme */
  --bg-dark: #0b1220;
  --bg-dark-secondary: #0f172a;
  --card-bg: rgba(22, 31, 51, 0.75);
  --card-bg-solid: #161f33;
  --card-hover: rgba(30, 41, 59, 0.85);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(59, 130, 246, 0.3);
  
  --primary-blue: #3b82f6;
  --primary-blue-glow: rgba(59, 130, 246, 0.25);
  --accent-indigo: #4f46e5;
  --accent-purple: #8b5cf6;
  --accent-purple-glow: rgba(139, 92, 246, 0.3);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Alegreya', Georgia, serif;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

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

/* Background Ambient Glow Effects */
.ambient-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  z-index: -1;
  pointer-events: none;
  opacity: 0.45;
}

.glow-top-left {
  top: -100px;
  left: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--accent-indigo), transparent 70%);
}

.glow-top-right {
  top: 10%;
  right: -150px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-purple), transparent 70%);
}

.glow-center {
  top: 55%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15), transparent 70%);
}

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

/* Navigation Header */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(11, 18, 32, 0.8);
  border-bottom: 1px solid var(--border-subtle);
  padding: 16px 0;
  transition: var(--transition-fast);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
}

.app-icon-img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  box-shadow: 0 4px 12px var(--primary-blue-glow);
}

.brand-text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-main);
}

.nav-cta-btn {
  background: linear-gradient(135deg, var(--primary-blue), var(--accent-indigo));
  color: white;
  padding: 10px 20px;
  border-radius: var(--radius-full);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: 0 4px 14px var(--primary-blue-glow);
  transition: var(--transition-fast);
}

.nav-cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

/* Hero Section */
.hero-section {
  padding: 80px 0 60px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.3);
  color: #c4b5fd;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-purple);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-purple);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #ffffff 40%, var(--text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--primary-blue), #60a5fa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 36px;
  max-width: 520px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, var(--primary-blue), var(--accent-indigo));
  color: white;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  box-shadow: 0 8px 25px var(--primary-blue-glow);
  transition: var(--transition-smooth);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 14px 24px;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition-smooth);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Phone Mockup Frame */
.phone-mockup-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.phone-mockup-frame {
  width: 320px;
  height: 650px;
  background: #111;
  border-radius: 44px;
  border: 8px solid #2d3748;
  box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.8), 
              0 0 40px var(--primary-blue-glow);
  overflow: hidden;
  position: relative;
}

.phone-screen-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.phone-notch {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  width: 90px;
  height: 20px;
  background: #000;
  border-radius: 12px;
  z-index: 10;
}

/* Floating Glass Cards */
.floating-glass-card {
  position: absolute;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(22, 31, 51, 0.85);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  gap: 14px;
  z-index: 20;
  animation: float 4s ease-in-out infinite alternate;
}

.card-left {
  bottom: 60px;
  left: -40px;
}

.card-right {
  top: 80px;
  right: -30px;
  animation-delay: -2s;
}

@keyframes float {
  0% { transform: translateY(0px); }
  100% { transform: translateY(-12px); }
}

.glass-icon {
  width: 44px;
  height: 44px;
  background: rgba(59, 130, 246, 0.15);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}

.glass-title {
  font-weight: 700;
  font-size: 0.9rem;
}

.glass-subtitle {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Kubun Ecosystem Suite Showcase Section */
.suite-section {
  padding: 60px 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(15, 23, 42, 0.4);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 50px;
}

.section-tag {
  color: var(--primary-blue);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.8rem;
  margin-bottom: 10px;
  display: block;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-description {
  color: var(--text-muted);
  font-size: 1.05rem;
}

.suite-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.suite-card {
  background: var(--card-bg);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(12px);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.suite-card.active {
  border-color: var(--border-highlight);
  background: rgba(30, 41, 59, 0.75);
  box-shadow: 0 10px 30px var(--primary-blue-glow);
}

.suite-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 255, 255, 0.2);
}

.suite-badge {
  position: absolute;
  top: 24px;
  right: 24px;
  background: rgba(59, 130, 246, 0.15);
  color: var(--primary-blue);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.suite-icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(139, 92, 246, 0.2));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.suite-card h3 {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.suite-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Feature Grid Section */
.features-section {
  padding: 100px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition-smooth);
}

.feature-card:hover {
  background: var(--card-hover);
  border-color: rgba(59, 130, 246, 0.4);
  transform: translateY(-4px);
}

.feature-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(59, 130, 246, 0.12);
  color: var(--primary-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 24px;
}

.feature-card h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* Screenshot Interactive Showcase */
.showcase-section {
  padding: 80px 0 100px;
  background: rgba(15, 23, 42, 0.6);
  border-top: 1px solid var(--border-subtle);
}

.showcase-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.tab-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  padding: 10px 24px;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
}

.tab-btn.active, .tab-btn:hover {
  background: var(--primary-blue);
  color: white;
  border-color: var(--primary-blue);
  box-shadow: 0 4px 14px var(--primary-blue-glow);
}

.showcase-viewer {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 48px;
  align-items: center;
  background: var(--card-bg-solid);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
}

.showcase-img-container {
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.7);
  border: 4px solid #1e293b;
}

.showcase-img-container img {
  width: 100%;
  display: block;
  transition: var(--transition-smooth);
}

.showcase-details h3 {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.showcase-details p {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 24px;
}

.quote-highlight-preview {
  background: rgba(30, 41, 59, 0.6);
  border-left: 3px solid var(--primary-blue);
  padding: 16px 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-style: italic;
  color: #e2e8f0;
  margin-top: 20px;
}

.quote-highlight-preview span.mark {
  background: rgba(37, 99, 235, 0.35);
  padding: 2px 6px;
  border-radius: 4px;
}

/* Architecture Specs Grid */
.tech-section {
  padding: 100px 0;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.tech-card {
  background: var(--card-bg);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  transition: var(--transition-fast);
}

.tech-card:hover {
  border-color: var(--primary-blue);
  transform: translateY(-4px);
}

.tech-card-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 6px;
}

.tech-card-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Call To Action Banner */
.cta-banner {
  margin: 40px 0 100px;
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.9), rgba(15, 23, 42, 0.95));
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner h2 {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-banner p {
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 32px;
  font-size: 1.1rem;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 40px 0;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition-fast);
}

.footer-links a:hover {
  color: var(--text-main);
}

/* Responsive Media Queries */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-actions {
    justify-content: center;
  }

  .card-left, .card-right {
    display: none;
  }

  .suite-grid, .features-grid {
    grid-template-columns: 1fr;
  }

  .tech-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .showcase-viewer {
    grid-template-columns: 1fr;
  }
  
  .showcase-img-container {
    max-width: 320px;
    margin: 0 auto;
  }
}

@media (max-width: 600px) {
  .hero-title {
    font-size: 2.5rem;
  }
  
  .tech-grid {
    grid-template-columns: 1fr;
  }
}