/* ==========================================================================
   NovaTab Website Design System & Main Stylesheet
   ========================================================================== */

:root {
  /* Brand Palette */
  --bg-dark: #070913;
  --bg-card: rgba(15, 23, 42, 0.65);
  --bg-card-hover: rgba(30, 41, 59, 0.8);
  --border-glass: rgba(255, 255, 255, 0.12);
  --border-glass-hover: rgba(56, 189, 248, 0.4);

  --accent-blue: #38bdf8;
  --accent-purple: #a855f7;
  --accent-cyan: #06b6d4;
  --accent-pink: #ec4899;
  --accent-glow: rgba(56, 189, 248, 0.35);

  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.78);
  --text-muted: rgba(255, 255, 255, 0.48);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* Ambient Ambient Gradient Orbs */
.ambient-glow {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  filter: blur(90px);
}

.glow-top-left {
  top: -150px;
  left: -100px;
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.18) 0%, transparent 70%);
}

.glow-top-right {
  top: 100px;
  right: -150px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.18) 0%, transparent 70%);
}

.glow-mid-left {
  top: 1400px;
  left: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.15) 0%, transparent 70%);
}

.glow-bottom-right {
  bottom: 200px;
  right: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(236, 72, 153, 0.14) 0%, transparent 70%);
}

/* Common Container */
.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Glassmorphism Card Utility */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  transition: all var(--transition-normal);
}

.glass-card:hover {
  border-color: var(--border-glass-hover);
  transform: translateY(-3px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.55);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, #38bdf8 0%, #2563eb 100%);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(56, 189, 248, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(56, 189, 248, 0.55);
  filter: brightness(1.08);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.07);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-color: var(--border-glass);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--accent-blue);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 16px 0;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(8, 11, 22, 0.75);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

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

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(56, 189, 248, 0.4);
}

.brand-text-group {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.brand-tagline-mini {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 500;
}

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

.nav-link {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-normal);
}

.nav-link:hover, .nav-link.active {
  color: var(--accent-blue);
}

.header-cta-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

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

.hero-content {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.hero-title {
  font-size: clamp(2.8rem, 6vw, 4.4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #38bdf8 20%, #a855f7 70%, #ec4899 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  color: var(--text-secondary);
  max-width: 680px;
  font-weight: 400;
  line-height: 1.5;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.hero-badges-row {
  display: flex;
  gap: 20px;
  margin-top: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hero-badges-row span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Product Mockup Frame */
.hero-mockup-wrapper {
  margin-top: 50px;
  position: relative;
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
}

.mockup-window {
  background: #0f172a;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: 0 25px 60px -12px rgba(0, 0, 0, 0.8), 0 0 40px rgba(56, 189, 248, 0.2);
  overflow: hidden;
}

.mockup-titlebar {
  background: rgba(15, 23, 42, 0.95);
  padding: 12px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.titlebar-dots {
  display: flex;
  gap: 6px;
}

.titlebar-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.mockup-tab-pill {
  background: rgba(255, 255, 255, 0.08);
  padding: 4px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

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

/* ==========================================================================
   Live Wallpapers Showcase Section
   ========================================================================== */
.section-live-wallpaper {
  padding: 90px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 50px;
}

.section-tag {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: 8px;
}

.section-title {
  font-size: clamp(2rem, 3.8vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

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

.split-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.showcase-features-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.showcase-feature-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.feature-icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
  color: var(--accent-blue);
}

.feature-item-text h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.feature-item-text p {
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.showcase-media-box {
  position: relative;
}

.showcase-media-box img {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-glass);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
}

/* ==========================================================================
   Features Grid Section
   ========================================================================== */
.features-section {
  padding: 90px 0;
  position: relative;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(330px, 1fr));
  gap: 24px;
}

.feature-card {
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.feature-card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  margin-bottom: 6px;
}

.feature-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.feature-card-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* ==========================================================================
   Screenshot & Demo Showcase Section
   ========================================================================== */
.demo-section {
  padding: 90px 0;
}

.showcase-nav-tabs {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 34px;
  flex-wrap: wrap;
}

.showcase-tab-btn {
  padding: 10px 20px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-glass);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.showcase-tab-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-primary);
}

.showcase-tab-btn.active {
  background: var(--accent-blue);
  color: #080b16;
  border-color: var(--accent-blue);
  box-shadow: 0 4px 14px var(--accent-glow);
}

.showcase-display-area {
  max-width: 1040px;
  margin: 0 auto;
}

.showcase-slide {
  display: none;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-glass);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7);
}

.showcase-slide.active {
  display: block;
}

/* ==========================================================================
   Browser Downloads Section
   ========================================================================== */
.downloads-section {
  padding: 100px 0;
  position: relative;
}

.browser-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
  margin-top: 40px;
}

.browser-card {
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 16px;
  position: relative;
}

.browser-icon-wrap {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  filter: drop-shadow(0 6px 12px rgba(0, 0, 0, 0.35));
}

.browser-icon-wrap img {
  width: 100%;
  height: 100%;
}

.browser-card-name {
  font-size: 1.2rem;
  font-weight: 700;
}

.browser-support-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.78rem;
  font-weight: 600;
  color: #10b981;
  background: rgba(16, 185, 129, 0.1);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.browser-card-footer {
  width: 100%;
  margin-top: 8px;
}

.btn-download-browser {
  width: 100%;
}

.download-version-meta {
  text-align: center;
  margin-top: 24px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ==========================================================================
   Quick Installation Section
   ========================================================================== */
.install-preview-section {
  padding: 70px 0 90px;
}

.install-steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin: 40px 0 30px;
}

.install-step-card {
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 8px;
}

.step-num-badge {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent-blue);
  color: #080b16;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.88rem;
}

.step-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
}

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

/* ==========================================================================
   Privacy Section
   ========================================================================== */
.privacy-section {
  padding: 80px 0;
}

.privacy-box {
  padding: 44px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 32px;
  align-items: center;
}

.privacy-shield-icon {
  font-size: 4rem;
  filter: drop-shadow(0 0 20px var(--accent-glow));
}

.privacy-content h3 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 10px;
}

.privacy-content p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.privacy-points-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 20px;
}

.privacy-point-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.privacy-point-item span {
  color: #10b981;
  font-weight: 700;
}

/* ==========================================================================
   FAQ Accordion
   ========================================================================== */
.faq-section {
  padding: 90px 0;
}

.faq-accordion {
  max-width: 820px;
  margin: 40px auto 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  overflow: hidden;
  transition: border-color var(--transition-normal);
}

.faq-item:hover {
  border-color: var(--border-glass-hover);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: transparent;
  border: none;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
}

.faq-icon {
  font-size: 1.2rem;
  color: var(--accent-blue);
  transition: transform var(--transition-normal);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 60px 0 36px;
  background: rgba(5, 7, 14, 0.9);
  position: relative;
  z-index: 10;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.footer-brand {
  max-width: 320px;
}

.footer-brand-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.footer-brand-tagline {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-links-group {
  display: flex;
  gap: 50px;
  flex-wrap: wrap;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-col-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.footer-link {
  text-decoration: none;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition-normal);
}

.footer-link:hover {
  color: var(--accent-blue);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 14px;
}

/* ==========================================================================
   Toast Notification & Modal
   ========================================================================== */
.download-toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translate(-50%, 0);
  z-index: 9999;
  background: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--accent-blue);
  border-radius: var(--radius-lg);
  padding: 16px 24px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6), 0 0 30px var(--accent-glow);
  display: flex;
  align-items: center;
  gap: 18px;
  animation: slideToastIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  max-width: 90vw;
}

.toast-content {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toast-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.toast-subtitle {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.toast-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.toast-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px;
}

.toast-close-btn:hover {
  color: var(--text-primary);
}