/* ============================================
   PersEvolve Studio - Design System
   ============================================ */

:root {
  /* Colors - Warm lantern palette */
  --bg-primary: #0d0d1a;
  --bg-secondary: #16162a;
  --bg-tertiary: #1f1f38;
  --bg-card: #1a1a2e;
  --bg-card-hover: #222240;

  --text-primary: #f5f5f7;
  --text-secondary: #b8b8c8;
  --text-muted: #7a7a8c;

  --accent-flame: #f4845f;
  --accent-flame-bright: #ff9f6b;
  --accent-amber: #f7b267;
  --accent-gold: #ffd166;

  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(244, 132, 95, 0.3);

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(244, 132, 95, 0.15);

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-display: 'Segoe UI', system-ui, -apple-system, sans-serif;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s ease;

  /* Max widths */
  --max-width: 1200px;
  --content-width: 760px;
}

/* ============================================
   Reset
   ============================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--accent-flame-bright);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

/* ============================================
   Ambient Background
   ============================================ */

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 10%, rgba(244, 132, 95, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 80% 80%, rgba(255, 209, 102, 0.05) 0%, transparent 40%);
  pointer-events: none;
  z-index: 0;
}

/* ============================================
   Layout
   ============================================ */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  position: relative;
  z-index: 1;
}

.container-narrow {
  max-width: var(--content-width);
}

section {
  padding: var(--space-2xl) 0;
  position: relative;
}

/* ============================================
   Navigation
   ============================================ */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 13, 26, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  max-width: var(--max-width);
  margin: 0 auto;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
}

.nav-brand .logo-emoji {
  font-size: 1.5rem;
  filter: drop-shadow(0 0 8px rgba(244, 132, 95, 0.4));
}

.nav-links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
}

.nav-links a:hover {
  color: var(--text-primary);
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  margin-bottom: var(--space-md);
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: var(--space-md);
}

h3 {
  font-size: clamp(1.3rem, 2.5vw, 1.75rem);
  margin-bottom: var(--space-sm);
}

p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
}

.lead {
  font-size: 1.2rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 640px;
}

.text-gradient {
  background: linear-gradient(135deg, var(--accent-flame) 0%, var(--accent-gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.text-muted {
  color: var(--text-muted);
}

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-flame);
  margin-bottom: var(--space-sm);
}

/* ============================================
   Buttons
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-base);
  cursor: pointer;
  white-space: nowrap;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-flame) 0%, var(--accent-amber) 100%);
  color: #1a1a2e;
  box-shadow: 0 4px 20px rgba(244, 132, 95, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(244, 132, 95, 0.5);
  color: #1a1a2e;
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
  color: var(--text-primary);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
}

/* ============================================
   Hero
   ============================================ */

.hero {
  min-height: 85vh;
  display: flex;
  align-items: center;
  padding: var(--space-xl) 0;
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: 800px;
  position: relative;
  z-index: 2;
}

.hero-title {
  margin-bottom: var(--space-md);
}

.hero-tagline {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  max-width: 620px;
  line-height: 1.6;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.hero-lantern {
  position: absolute;
  right: -2rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 18rem;
  opacity: 0.08;
  pointer-events: none;
  filter: blur(1px);
}

/* ============================================
   Values / Philosophy
   ============================================ */

.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.value-card {
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.value-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.value-icon {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

.value-card h3 {
  font-size: 1.2rem;
  margin-bottom: var(--space-xs);
}

.value-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* ============================================
   Apps Grid
   ============================================ */

.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.app-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
}

.app-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  color: inherit;
}

.app-card-image {
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  position: relative;
  overflow: hidden;
}

.app-card-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(244, 132, 95, 0.2), transparent 70%);
}

.app-card-content {
  padding: var(--space-md);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.app-card-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-flame);
  margin-bottom: var(--space-xs);
}

.app-card h3 {
  font-size: 1.3rem;
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
}

.app-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  flex: 1;
}

.app-card-footer {
  display: flex;
  gap: var(--space-xs);
  align-items: center;
  margin-top: auto;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--border);
}

.app-card-status {
  font-size: 0.85rem;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-flame);
  box-shadow: 0 0 8px var(--accent-flame);
}

.status-dot.soon {
  background: var(--text-muted);
  box-shadow: none;
}

/* Placeholder "coming soon" cards */
.app-card-placeholder {
  background: transparent;
  border: 2px dashed var(--border);
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-xl);
  min-height: 280px;
}

.app-card-placeholder:hover {
  border-color: var(--border-hover);
  transform: none;
  box-shadow: none;
}

.app-card-placeholder .placeholder-icon {
  font-size: 3rem;
  opacity: 0.3;
  margin-bottom: var(--space-sm);
}

.app-card-placeholder .placeholder-text {
  color: var(--text-muted);
  font-weight: 500;
}

/* ============================================
   Featured App (Habit Lantern hero block)
   ============================================ */

.featured-app {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
  padding: var(--space-xl);
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-card) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
}

.featured-app::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 100% 0%, rgba(244, 132, 95, 0.12) 0%, transparent 50%);
  pointer-events: none;
}

.featured-app-content {
  position: relative;
  z-index: 1;
}

.featured-app-visual {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12rem;
  filter: drop-shadow(0 0 60px rgba(244, 132, 95, 0.4));
}

.featured-app h2 {
  margin-bottom: var(--space-sm);
}

.featured-app .lead {
  margin-bottom: var(--space-md);
}

.feature-list {
  list-style: none;
  margin-bottom: var(--space-lg);
}

.feature-list li {
  padding: 0.5rem 0;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
}

.feature-list li::before {
  content: '✦';
  color: var(--accent-flame);
  font-weight: bold;
  flex-shrink: 0;
}

/* ============================================
   About / Contact Section
   ============================================ */

.about-section {
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.about-section .lead {
  margin: 0 auto var(--space-lg);
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
  margin-top: var(--space-md);
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-weight: 500;
  transition: all var(--transition-base);
}

.contact-link:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* ============================================
   Footer
   ============================================ */

.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-lg) 0;
  margin-top: var(--space-xl);
  background: var(--bg-secondary);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  list-style: none;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

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

/* ============================================
   Animations
   ============================================ */

@keyframes flicker {
  0%, 100% { opacity: 1; filter: drop-shadow(0 0 30px rgba(244, 132, 95, 0.5)); }
  50% { opacity: 0.85; filter: drop-shadow(0 0 50px rgba(244, 132, 95, 0.8)); }
}

.flicker {
  animation: flicker 3s ease-in-out infinite;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

.fade-in:nth-child(1) { animation-delay: 0.1s; }
.fade-in:nth-child(2) { animation-delay: 0.2s; }
.fade-in:nth-child(3) { animation-delay: 0.3s; }
.fade-in:nth-child(4) { animation-delay: 0.4s; }

/* ============================================
   App Detail Page
   ============================================ */

.app-detail-header {
  padding: var(--space-2xl) 0 var(--space-xl);
  text-align: center;
  position: relative;
}

.app-detail-icon {
  font-size: 5rem;
  margin-bottom: var(--space-md);
  display: inline-block;
  filter: drop-shadow(0 0 40px rgba(244, 132, 95, 0.5));
}

.app-detail-title {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  margin-bottom: var(--space-sm);
}

.app-detail-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.app-detail-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
  margin-top: var(--space-md);
}

.feature-section {
  margin-bottom: var(--space-xl);
}

.feature-section h2 {
  margin-bottom: var(--space-md);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
}

.feature-item {
  padding: var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.feature-item-icon {
  font-size: 1.75rem;
  margin-bottom: var(--space-xs);
}

.feature-item h3 {
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

.feature-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
}

/* ============================================
   Privacy / Content page
   ============================================ */

.content-page {
  padding: var(--space-xl) 0 var(--space-2xl);
}

.content-page h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin-bottom: var(--space-sm);
}

.content-page h2 {
  font-size: 1.5rem;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
  color: var(--accent-flame);
}

.content-page h3 {
  font-size: 1.15rem;
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}

.content-page p,
.content-page li {
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  line-height: 1.75;
}

.content-page ul {
  padding-left: 1.25rem;
  margin-bottom: var(--space-sm);
}

.content-page .meta {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: var(--space-lg);
}

.content-page strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
  section {
    padding: var(--space-xl) 0;
  }

  .hero {
    min-height: 70vh;
  }

  .hero-lantern {
    font-size: 14rem;
    opacity: 0.05;
  }

  .featured-app {
    grid-template-columns: 1fr;
    padding: var(--space-lg);
    text-align: center;
    gap: var(--space-md);
  }

  .featured-app-visual {
    font-size: 8rem;
    order: -1;
  }

  .feature-list {
    text-align: left;
  }

  .nav-links {
    gap: var(--space-sm);
  }

  .nav-links .nav-link-full {
    display: none;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    justify-content: center;
  }
}

/* ============================================
   Utility
   ============================================ */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.center { text-align: center; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }