/**
 * AppBuildStudio Pro - Main Core Stylesheet
 * High performance, zero bloat, mobile-first responsive architecture
 */

/* ==========================================================================
   CSS VARIABLES & DESIGN SYSTEM
   ========================================================================== */
:root {
  /* Core Backgrounds */
  --abs-bg-primary: #080c14;
  --abs-bg-secondary: #0e1422;
  --abs-bg-tertiary: #141c30;
  --abs-bg-card: rgba(18, 26, 44, 0.72);
  --abs-bg-card-hover: rgba(26, 37, 62, 0.85);
  --abs-bg-glass: rgba(255, 255, 255, 0.04);
  --abs-bg-glass-heavy: rgba(14, 20, 34, 0.88);

  /* Borders & Dividers */
  --abs-border-subtle: rgba(255, 255, 255, 0.07);
  --abs-border-glow: rgba(0, 240, 255, 0.35);
  --abs-border-card: rgba(255, 255, 255, 0.1);
  --abs-border-card-hover: rgba(0, 240, 255, 0.5);

  /* Vibrant Accent Palette */
  --abs-cyan: #00f0ff;
  --abs-cyan-glow: rgba(0, 240, 255, 0.4);
  --abs-purple: #8a2be2;
  --abs-purple-glow: rgba(138, 43, 226, 0.4);
  --abs-pink: #ff3385;
  --abs-pink-glow: rgba(255, 51, 133, 0.4);
  --abs-amber: #ffaa00;
  --abs-emerald: #00e676;
  --abs-blue: #3b82f6;

  /* Gradients */
  --abs-gradient-primary: linear-gradient(135deg, #00f0ff 0%, #7928ca 50%, #ff0080 100%);
  --abs-gradient-accent: linear-gradient(135deg, #00f0ff 0%, #3b82f6 100%);
  --abs-gradient-card: linear-gradient(145deg, rgba(25, 34, 56, 0.7) 0%, rgba(12, 17, 30, 0.9) 100%);
  --abs-gradient-glow: radial-gradient(circle at 50% 0%, rgba(0, 240, 255, 0.15), transparent 70%);

  /* Typography */
  --abs-font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --abs-font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Text Colors */
  --abs-text-primary: #f8fafc;
  --abs-text-secondary: #94a3b8;
  --abs-text-muted: #64748b;
  --abs-text-accent: #00f0ff;

  /* Dimensions & Spacing */
  --abs-max-width: 1240px;
  --abs-radius-sm: 8px;
  --abs-radius-md: 14px;
  --abs-radius-lg: 22px;
  --abs-radius-xl: 32px;
  --abs-radius-full: 9999px;

  /* Transitions */
  --abs-transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --abs-transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --abs-transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);

  /* Elevation & Shadows */
  --abs-shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);
  --abs-shadow-md: 0 10px 30px rgba(0, 0, 0, 0.35);
  --abs-shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.5);
  --abs-shadow-glow: 0 0 40px rgba(0, 240, 255, 0.25);
  --abs-shadow-glow-purple: 0 0 40px rgba(138, 43, 226, 0.3);
}

/* Light Theme Variables Override (Toggled via [data-theme="light"]) */
[data-theme="light"] {
  --abs-bg-primary: #f8fafc;
  --abs-bg-secondary: #ffffff;
  --abs-bg-tertiary: #f1f5f9;
  --abs-bg-card: #ffffff;
  --abs-bg-card-hover: #ffffff;
  --abs-bg-glass: rgba(15, 23, 42, 0.04);
  --abs-bg-glass-heavy: rgba(255, 255, 255, 0.95);

  --abs-border-subtle: #e2e8f0;
  --abs-border-glow: rgba(2, 132, 199, 0.35);
  --abs-border-card: #e2e8f0;
  --abs-border-card-hover: #94a3b8;

  --abs-cyan: #0284c7;
  --abs-cyan-glow: rgba(2, 132, 199, 0.25);
  --abs-purple: #7c3aed;
  --abs-purple-glow: rgba(124, 58, 237, 0.25);
  --abs-pink: #db2777;
  --abs-pink-glow: rgba(219, 39, 119, 0.25);
  --abs-amber: #d97706;
  --abs-emerald: #059669;
  --abs-blue: #2563eb;

  --abs-gradient-primary: linear-gradient(135deg, #0284c7 0%, #6366f1 50%, #db2777 100%);
  --abs-gradient-accent: linear-gradient(135deg, #0284c7 0%, #2563eb 100%);
  --abs-gradient-card: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  --abs-gradient-glow: radial-gradient(circle at 50% 0%, rgba(2, 132, 199, 0.08), transparent 70%);

  --abs-text-primary: #0f172a;
  --abs-text-secondary: #334155;
  --abs-text-muted: #64748b;
  --abs-text-accent: #0284c7;

  --abs-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
  --abs-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.03);
  --abs-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --abs-shadow-glow: 0 4px 20px rgba(2, 132, 199, 0.15);
  --abs-shadow-glow-purple: 0 4px 20px rgba(124, 58, 237, 0.15);
}

/* ==========================================================================
   RESET & FOUNDATION
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ==========================================================================
   GLOBAL SVG ICON SIZING & NORMALIZATION
   ========================================================================== */
svg {
  display: inline-block;
  vertical-align: middle;
  flex-shrink: 0;
  max-width: 100%;
}

.abs-brand-icon svg { width: 22px; height: 22px; }
.abs-drawer-close svg { width: 20px; height: 20px; }
.abs-theme-toggle svg { width: 18px; height: 18px; }
.abs-btn svg { width: 18px; height: 18px; }
.abs-btn-sm svg { width: 15px; height: 15px; }
.abs-btn-lg svg { width: 20px; height: 20px; }
.abs-card-rating svg { width: 15px; height: 15px; }
.abs-feature-icon svg { width: 28px; height: 28px; }
.abs-value-icon svg { width: 28px; height: 28px; }
.abs-badge-icon { width: 16px; height: 16px; }
.abs-verified-svg { width: 18px; height: 18px; }
.abs-stat-icon { width: 20px; height: 20px; }
.abs-app-hero-meta-item svg { width: 18px; height: 18px; }
.abs-modal-close svg { width: 22px; height: 22px; }


html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--abs-font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--abs-text-primary);
  background-color: var(--abs-bg-primary);
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
}

/* Ambient dynamic background lighting */
body::before {
  content: '';
  position: fixed;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 1000px;
  height: 600px;
  background: radial-gradient(ellipse at center, rgba(0, 240, 255, 0.08) 0%, rgba(138, 43, 226, 0.06) 45%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

img, svg, picture, video {
  max-width: 100%;
  height: auto;
  display: block;
}

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

button, input, textarea, select {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

button {
  cursor: pointer;
}

ul, ol {
  list-style: none;
}

/* ==========================================================================
   TYPOGRAPHY
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--abs-font-heading);
  font-weight: 700;
  color: var(--abs-text-primary);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.4rem, 5vw, 3.8rem); font-weight: 800; }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.6rem); }
h3 { font-size: clamp(1.35rem, 2.2vw, 1.75rem); }
h4 { font-size: 1.25rem; }

p {
  color: var(--abs-text-secondary);
}

.gradient-text {
  background: var(--abs-gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.gradient-text-cyan {
  background: var(--abs-gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* ==========================================================================
   CONTAINERS & LAYOUT
   ========================================================================== */
.abs-container {
  width: 100%;
  max-width: var(--abs-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
  position: relative;
  z-index: 1;
}

.abs-section {
  padding-top: 5.5rem;
  padding-bottom: 5.5rem;
  position: relative;
}

.abs-section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3.5rem auto;
}

.abs-section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  border-radius: var(--abs-radius-full);
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid rgba(0, 240, 255, 0.25);
  color: var(--abs-cyan);
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
}

.abs-section-title {
  margin-bottom: 1rem;
}

.abs-section-subtitle {
  font-size: 1.125rem;
  color: var(--abs-text-secondary);
}

/* ==========================================================================
   HEADER & NAVIGATION
   ========================================================================== */
.abs-site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  transition: background var(--abs-transition-normal), backdrop-filter var(--abs-transition-normal), border-color var(--abs-transition-normal);
  border-bottom: 1px solid transparent;
}

.abs-site-header.scrolled {
  background: var(--abs-bg-glass-heavy);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-color: var(--abs-border-subtle);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.abs-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

/* Brand Logo */
.abs-brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--abs-font-heading);
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--abs-text-primary);
}

.abs-brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: transparent;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 4px 20px rgba(0, 240, 255, 0.25);
  transition: transform var(--abs-transition-fast), filter var(--abs-transition-fast);
}

.abs-brand-logo:hover .abs-brand-icon {
  transform: scale(1.08);
  filter: drop-shadow(0 0 12px rgba(0, 240, 255, 0.5));
}

.abs-brand-icon svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* Nav Menu */
.abs-nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.abs-nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--abs-text-secondary);
  position: relative;
  padding: 0.5rem 0;
}

.abs-nav-link:hover, .abs-nav-link.active {
  color: var(--abs-text-primary);
}

.abs-nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--abs-gradient-accent);
  transition: width var(--abs-transition-fast);
  border-radius: var(--abs-radius-full);
}

.abs-nav-link:hover::after, .abs-nav-link.active::after {
  width: 100%;
}

/* Header Action buttons */
.abs-header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Theme Toggle Button */
.abs-theme-toggle {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--abs-bg-glass);
  border: 1px solid var(--abs-border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--abs-text-secondary);
  transition: all var(--abs-transition-fast);
  cursor: pointer;
  position: relative;
}

.abs-theme-toggle svg {
  width: 20px;
  height: 20px;
  transition: transform var(--abs-transition-normal), opacity var(--abs-transition-fast);
}

/* Dark mode: show sun to switch to light, hide moon */
.theme-icon-sun {
  display: block;
}
.theme-icon-moon {
  display: none;
}

/* Light mode: show moon to switch to dark, hide sun */
[data-theme="light"] .theme-icon-sun {
  display: none !important;
}
[data-theme="light"] .theme-icon-moon {
  display: block !important;
}

.abs-theme-toggle:hover {
  color: var(--abs-cyan);
  border-color: var(--abs-border-glow);
  background: rgba(0, 240, 255, 0.08);
  transform: scale(1.05);
}

/* Hamburger for Mobile */
.abs-mobile-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--abs-bg-glass);
  border: 1px solid var(--abs-border-subtle);
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.abs-mobile-toggle span {
  width: 20px;
  height: 2px;
  background: var(--abs-text-primary);
  transition: transform var(--abs-transition-fast), opacity var(--abs-transition-fast);
  border-radius: 2px;
}

/* ==========================================================================
   BUTTONS & BADGES
   ========================================================================== */
.abs-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  padding: 0.8rem 1.75rem;
  border-radius: var(--abs-radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--abs-transition-normal);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.abs-btn-primary {
  background: linear-gradient(135deg, #00f0ff 0%, #0070f3 100%);
  color: #000000;
  font-weight: 700;
  box-shadow: 0 0 25px rgba(0, 240, 255, 0.35);
}

.abs-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 35px rgba(0, 240, 255, 0.55);
}

.abs-btn-secondary {
  background: var(--abs-bg-glass);
  color: var(--abs-text-primary);
  border: 1px solid var(--abs-border-card);
  backdrop-filter: blur(10px);
}

.abs-btn-secondary:hover {
  border-color: var(--abs-cyan);
  color: var(--abs-cyan);
  background: rgba(0, 240, 255, 0.06);
  transform: translateY(-2px);
}

.abs-btn-play {
  background: #01875f;
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 4px 18px rgba(1, 135, 95, 0.4);
}

.abs-btn-play:hover {
  background: #029a6d;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(1, 135, 95, 0.6);
}

.abs-btn-sm {
  padding: 0.55rem 1.15rem;
  font-size: 0.85rem;
  border-radius: var(--abs-radius-sm);
}

.abs-btn-lg {
  padding: 1rem 2.25rem;
  font-size: 1.05rem;
  border-radius: var(--abs-radius-lg);
}

/* ==========================================================================
   MOBILE MENU DRAWER
   ========================================================================== */
.abs-mobile-drawer {
  position: fixed;
  top: 0;
  right: -100%;
  width: min(85vw, 360px);
  height: 100vh;
  background: var(--abs-bg-secondary);
  border-left: 1px solid var(--abs-border-subtle);
  z-index: 1000;
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: right var(--abs-transition-normal);
  box-shadow: -15px 0 40px rgba(0, 0, 0, 0.6);
}

.abs-mobile-drawer.open {
  right: 0;
}

.abs-drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(6px);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--abs-transition-normal);
}

.abs-drawer-backdrop.visible {
  opacity: 1;
  pointer-events: auto;
}

.abs-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2.5rem;
}

.abs-drawer-close {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--abs-bg-glass);
  border: 1px solid var(--abs-border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
}

.abs-mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.abs-mobile-nav-links a {
  font-size: 1.25rem;
  font-family: var(--abs-font-heading);
  font-weight: 600;
  color: var(--abs-text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--abs-border-subtle);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.abs-site-footer {
  margin-top: auto;
  background: var(--abs-bg-secondary);
  border-top: 1px solid var(--abs-border-subtle);
  position: relative;
  padding-top: 5rem;
  padding-bottom: 2.5rem;
  overflow: hidden;
}

.abs-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3.5rem;
  margin-bottom: 4rem;
}

.abs-footer-brand p {
  margin-top: 1.2rem;
  margin-bottom: 1.5rem;
  max-width: 340px;
  font-size: 0.95rem;
}

.abs-footer-col h4 {
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
  color: var(--abs-text-primary);
  position: relative;
}

.abs-footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.abs-footer-links a {
  color: var(--abs-text-secondary);
  font-size: 0.92rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.abs-footer-links a:hover {
  color: var(--abs-cyan);
  transform: translateX(3px);
}

.abs-social-links {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.abs-social-btn {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--abs-bg-glass);
  border: 1px solid var(--abs-border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--abs-text-secondary);
  transition: all var(--abs-transition-fast);
}

.abs-social-btn:hover {
  color: var(--abs-cyan);
  border-color: var(--abs-cyan);
  background: rgba(0, 240, 255, 0.1);
  transform: translateY(-2px);
}

.abs-footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--abs-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--abs-text-muted);
}

.abs-footer-legal {
  display: flex;
  gap: 1.5rem;
}

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

/* ==========================================================================
   RESPONSIVE BREAKPOINTS (ALL DEVICES & ORIENTATIONS)
   ========================================================================== */

/* Universal Overflow & Touch Normalization */
html, body {
  overflow-x: hidden !important;
  max-width: 100vw;
  width: 100%;
}

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

img, svg, video, canvas {
  max-width: 100%;
  height: auto;
}

/* 1. Large Tablets & Small Laptops (max-width: 1024px) */
@media (max-width: 1024px) {
  .abs-footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }
}

/* 2. Standard Tablets (max-width: 820px) */
@media (max-width: 820px) {
  .abs-nav-menu {
    display: none;
  }
  .abs-mobile-toggle {
    display: flex;
  }
  .abs-section {
    padding-top: 3.5rem;
    padding-bottom: 3.5rem;
  }
  .abs-footer-grid {
    grid-template-columns: 1fr;
    gap: 2.25rem;
  }
  .abs-footer-bottom {
    flex-direction: column;
    gap: 1.25rem;
    text-align: center;
  }
  .abs-footer-legal {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem 1rem;
  }
}

/* 3. Small Tablets & Landscape Mobile (max-width: 640px) */
@media (max-width: 640px) {
  .abs-container {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }
  .abs-section-header {
    margin-bottom: 2.25rem;
  }
  .abs-section-title {
    font-size: clamp(1.65rem, 5vw, 2.2rem);
  }
  .abs-btn-lg {
    padding: 0.75rem 1.4rem;
    font-size: 0.95rem;
  }
}

/* 4. Standard Mobile Screens (max-width: 520px) */
@media (max-width: 520px) {
  .abs-container {
    padding-left: 1rem;
    padding-right: 1rem;
  }
  .abs-header-actions {
    gap: 0.5rem;
  }
  .abs-header-actions .abs-btn-play span {
    display: none;
  }
  .abs-header-actions .abs-btn-play {
    padding: 0.5rem;
    min-width: 38px;
    height: 38px;
    justify-content: center;
    border-radius: 10px;
  }
  .abs-header-actions .abs-btn-play svg {
    margin: 0;
  }
  .abs-theme-toggle {
    width: 38px;
    height: 38px;
    border-radius: 10px;
  }
  .abs-mobile-toggle {
    width: 38px;
    height: 38px;
  }
}

/* 5. Compact & Narrow Phones (max-width: 380px) */
@media (max-width: 380px) {
  .abs-header-actions .abs-btn-play {
    display: none;
  }
  .abs-brand-logo {
    gap: 8px;
  }
  .abs-brand-logo span:not(.abs-brand-icon) {
    font-size: 1.05rem;
  }
  .abs-brand-icon {
    width: 32px;
    height: 32px;
  }
  .abs-btn {
    padding: 0.7rem 1.15rem;
    font-size: 0.88rem;
  }
}