/* ==========================================
   Design System & Premium CSS Stylesheet (Light Theme)
   ========================================== */

/* Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* CSS Variables */
:root {
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Color Palette (Light Theme) */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  /* Glassmorphism Border & Backgrounds */
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-bg-hover: rgba(255, 255, 255, 0.95);
  --glass-border: rgba(15, 23, 42, 0.06);
  --glass-border-hover: rgba(15, 23, 42, 0.12);
  --glass-shadow: rgba(15, 23, 42, 0.03);

  /* Specific App Theme Colors */
  --color-pdf: #0284c7;
  --color-pdf-grad: linear-gradient(135deg, #0ea5e9, #2563eb);
  
  --color-fonts: #7c3aed;
  --color-fonts-grad: linear-gradient(135deg, #a855f7, #6366f1);
  
  --color-symptom: #db2777;
  --color-symptom-grad: linear-gradient(135deg, #ec4899, #f43f5e);
  
  --color-pulse: #dc2626;
  --color-pulse-grad: linear-gradient(135deg, #ef4444, #b91c1c);
  
  --color-water: #0891b2;
  --color-water-grad: linear-gradient(135deg, #06b6d4, #0891b2);

  /* Animations & Transitions */
  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.2s ease;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
}

body {
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
  position: relative;
  background-color: var(--bg-primary);
}

/* Background Ambient Glows */
body::before, body::after {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  filter: blur(140px);
  opacity: 0.12;
  z-index: -1;
  pointer-events: none;
}

body::before {
  top: -5%;
  left: -5%;
  background: var(--color-water);
}

body::after {
  bottom: 15%;
  right: -5%;
  background: var(--color-fonts);
}

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

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

/* Header & Navigation */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  background: rgba(248, 250, 252, 0.85);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, #0f172a, #334155);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-pdf-grad);
  display: inline-block;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

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

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

/* Hero Section */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 6rem 2rem 4rem;
  text-align: center;
  position: relative;
}

.hero-tag {
  display: inline-block;
  padding: 0.4rem 1.2rem;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--glass-border);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.02);
}

.hero h1 {
  font-size: 4rem;
  max-width: 900px;
  margin: 0 auto 1.5rem;
  color: var(--text-primary);
  line-height: 1.15;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto 3rem;
  font-weight: 400;
}

/* Dynamic Filter Controls */
.filter-container {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin: 0 auto 3.5rem;
  max-width: 600px;
  flex-wrap: wrap;
}

.filter-btn {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.6rem 1.4rem;
  border-radius: 9999px;
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  cursor: pointer;
  transition: var(--transition-smooth);
  color: var(--text-secondary);
}

.filter-btn:hover {
  color: var(--text-primary);
  border-color: rgba(15, 23, 42, 0.15);
}

.filter-btn.active {
  background: #000000;
  border-color: #000000;
  color: #ffffff;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
}

/* Main Grid & Cards */
.grid-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem 5rem;
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2.5rem;
}

/* Premium Light Card Style */
.app-card {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
  overflow: hidden;
  box-shadow: 0 8px 30px var(--glass-shadow);
  transition: var(--transition-smooth);
  opacity: 1;
  transform: scale(1) translateY(0);
}

.app-card.hidden {
  display: none;
  opacity: 0;
  transform: scale(0.95) translateY(12px);
}

.app-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: transparent;
  transition: var(--transition-smooth);
}

/* Theme gradients on top of cards */
.app-card.pdf-scanner::before { background: var(--color-pdf-grad); }
.app-card.keyboard-fonts::before { background: var(--color-fonts-grad); }
.app-card.symptom-tracker::before { background: var(--color-symptom-grad); }
.app-card.pulse-monitor::before { background: var(--color-pulse-grad); }
.app-card.water-reminder::before { background: var(--color-water-grad); }

.app-card:hover {
  background: var(--glass-bg-hover);
  border-color: rgba(15, 23, 42, 0.15);
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.08);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.app-icon {
  width: 80px;
  height: 80px;
  border-radius: 18px;
  object-fit: cover;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.06);
  transition: var(--transition-smooth);
}

.app-card:hover .app-icon {
  transform: scale(1.04);
}

.app-title-area h3 {
  font-size: 1.35rem;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.app-category {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.6rem;
  background: rgba(15, 23, 42, 0.03);
  border: 1px solid var(--glass-border);
  border-radius: 9999px;
  display: inline-block;
}

/* Category Accent colors */
.pdf-scanner .app-category { color: var(--color-pdf); }
.keyboard-fonts .app-category { color: var(--color-fonts); }
.symptom-tracker .app-category { color: var(--color-symptom); }
.pulse-monitor .app-category { color: var(--color-pulse); }
.water-reminder .app-category { color: var(--color-water); }

.app-summary {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  flex-grow: 1;
}

.app-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--glass-border);
  padding-top: 1.25rem;
  margin-top: auto;
}

.app-rating {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.star-icon {
  color: #fbbf24;
  font-size: 1.1rem;
}

.view-btn {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.6rem 1.2rem;
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.02);
  border: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.app-card.pdf-scanner:hover .view-btn { background: var(--color-pdf-grad); border-color: transparent; color: #fff; }
.app-card.keyboard-fonts:hover .view-btn { background: var(--color-fonts-grad); border-color: transparent; color: #fff; }
.app-card.symptom-tracker:hover .view-btn { background: var(--color-symptom-grad); border-color: transparent; color: #fff; }
.app-card.pulse-monitor:hover .view-btn { background: var(--color-pulse-grad); border-color: transparent; color: #fff; }
.app-card.water-reminder:hover .view-btn { background: var(--color-water-grad); border-color: transparent; color: #fff; }

/* Core Values Section */
.values-section {
  background: var(--bg-tertiary);
  padding: 6rem 2rem;
  border-top: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
  position: relative;
}

.values-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 3.5rem;
}

.value-card {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 2.5rem;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.01);
  transition: var(--transition-smooth);
}

.value-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.03);
}

.value-icon {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  display: inline-block;
}

.value-card h4 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
  font-weight: 600;
}

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

/* ==========================================
   App Detail Page Layout
   ========================================== */
.detail-hero {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4rem 2rem 2.5rem;
  display: flex;
  gap: 3.5rem;
  align-items: flex-end;
  justify-content: space-between;
}

.detail-hero-left {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: flex-start;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: var(--transition-fast);
}

.back-link:hover {
  color: var(--text-primary);
  transform: translateX(-4px);
}

.detail-icon {
  width: 130px;
  height: 130px;
  border-radius: 28px;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.08);
  border: 1px solid var(--glass-border);
  display: block;
}

.detail-hero-right {
  display: flex;
  flex-grow: 1;
  justify-content: space-between;
  align-items: center;
  gap: 2.5rem;
}

.detail-meta-info {
  display: flex;
  flex-direction: column;
}

.detail-hero-right h1 {
  font-size: 2.5rem;
  margin-bottom: 0.4rem;
  color: var(--text-primary);
}

.detail-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.detail-stats {
  display: flex;
  gap: 2rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
}

/* App Store Badge Button */
.app-store-btn {
  display: inline-flex;
  align-items: center;
  background: #000000;
  color: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.85);
  border-radius: 14px;
  padding: 0.75rem 1.6rem;
  gap: 0.8rem;
  font-family: -apple-system, sans-serif;
  transition: var(--transition-smooth);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
  flex-shrink: 0;
}

.app-store-btn:hover {
  background: #1e1e1e;
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.18);
}

.app-store-btn svg {
  width: 24px;
  height: 24px;
}

.btn-txt-small {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: block;
}

.btn-txt-large {
  font-size: 1rem;
  font-weight: 600;
  display: block;
}

/* Detail Columns */
.detail-content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem 2rem 6rem;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 4rem;
}

.detail-main h2 {
  font-size: 1.75rem;
  margin: 2.5rem 0 1.25rem;
  border-bottom: 1px solid var(--glass-border);
  padding-bottom: 0.5rem;
  color: var(--text-primary);
}

.detail-main h2:first-of-type {
  margin-top: 0;
}

.detail-main p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
  white-space: pre-line;
}

/* Feature grid items on details page */
.feature-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin: 2rem 0;
}

.feature-item {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.01);
}

.feature-title {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text-primary);
}

.feature-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Screenshot Slider */
.screenshots-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 2rem 3rem;
  position: relative;
}

.screenshots-container {
  display: flex;
  gap: 1.5rem;
  overflow-x: auto;
  padding-bottom: 1.5rem;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: rgba(15, 23, 42, 0.1) transparent;
}

.screenshots-container::-webkit-scrollbar {
  height: 6px;
}

.screenshots-container::-webkit-scrollbar-thumb {
  background: rgba(15, 23, 42, 0.1);
  border-radius: 999px;
}

.screenshot-wrapper {
  flex: 0 0 auto;
  scroll-snap-align: start;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.05);
  border: 1px solid var(--glass-border);
  background-color: var(--bg-secondary);
}

.screenshot-img {
  width: 240px;
  height: 520px;
  object-fit: cover;
  display: block;
  transition: var(--transition-smooth);
}

.screenshot-img:hover {
  transform: scale(1.01);
}

/* Sidebar Details */
.detail-sidebar {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.sidebar-card {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 2rem;
  box-shadow: 0 10px 25px var(--glass-shadow);
}

.sidebar-card h3 {
  font-size: 1.2rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--glass-border);
  padding-bottom: 0.5rem;
  color: var(--text-primary);
}

.sidebar-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.sidebar-list li {
  display: flex;
  justify-content: space-between;
  font-size: 0.95rem;
}

.sidebar-list .label {
  color: var(--text-secondary);
}

.sidebar-list .val {
  font-weight: 500;
  text-align: right;
  color: var(--text-primary);
}

/* ==========================================
   Premium Footer Redesign
   ========================================== */
footer {
  border-top: 1px solid var(--glass-border);
  background: var(--bg-secondary);
  padding: 5rem 2rem 3rem;
  position: relative;
  z-index: 10;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 4rem;
  margin-bottom: 3.5rem;
  text-align: left;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: 340px;
  line-height: 1.6;
}

.footer-col h4 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  font-weight: 700;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-col a {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.footer-col a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  border-top: 1px solid var(--glass-border);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
}

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

/* ==========================================
   Privacy and Terms Pages (Legal)
   ========================================== */
.legal-container {
  max-width: 850px;
  margin: 0 auto;
  padding: 6rem 2rem;
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  box-shadow: 0 10px 30px var(--glass-shadow);
  margin-top: 3rem;
  margin-bottom: 3rem;
}

.legal-container h1 {
  font-size: 3rem;
  margin-bottom: 2rem;
  text-align: center;
  color: var(--text-primary);
}

.legal-container h2 {
  font-size: 1.5rem;
  margin: 2.25rem 0 1rem;
  color: var(--text-primary);
  border-bottom: 1px solid var(--glass-border);
  padding-bottom: 0.4rem;
}

.legal-container p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  line-height: 1.75;
}

.legal-container ul {
  list-style-type: square;
  padding-left: 2rem;
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

.legal-container li {
  margin-bottom: 0.6rem;
  line-height: 1.6;
}

/* ==========================================
   Responsive Breakpoints
   ========================================== */
@media (max-width: 992px) {
  .detail-hero {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 2.5rem;
  }
  
  .detail-hero-left {
    align-items: center;
  }
  
  .detail-hero-right {
    flex-direction: column;
    align-items: center;
    gap: 2rem;
  }
  
  .detail-stats {
    justify-content: center;
  }
  
  .detail-content {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.75rem;
  }
  
  .hero p {
    font-size: 1.1rem;
  }
  
  .feature-list {
    grid-template-columns: 1fr;
  }
  
  .nav-container {
    flex-direction: column;
    gap: 1rem;
  }
  
  .app-grid {
    grid-template-columns: 1fr;
  }
  
  .legal-container h1 {
    font-size: 2.25rem;
  }

  .footer-container {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    text-align: center;
  }
  
  .footer-brand p {
    max-width: 100%;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}