/* ===================================================
   TabNest — styles.css
   Dark theme: #0a0a0f bg, #e91e8c accent, Inter font
   =================================================== */

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0a0a0f;
  --bg-card: #13131f;
  --bg-card-hover: #1a1a2e;
  --accent: #e91e8c;
  --accent-dark: #c4166e;
  --accent-glow: rgba(233, 30, 140, 0.25);
  --text: #ffffff;
  --text-muted: #a0a0b4;
  --border: #2a2a3e;
  --border-hover: #3d3d5a;
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.25s ease;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
}

html { scroll-behavior: smooth; }

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

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

a { text-decoration: none; color: inherit; }

ul { list-style: none; }

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

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 50px;
  font-family: var(--font);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border-color: var(--border-hover);
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn-xl { padding: 18px 36px; font-size: 18px; }

/* ---- Section Helpers ---- */
.section-label {
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 64px;
}

.section-header h2 {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-sub {
  color: var(--text-muted);
  font-size: 17px;
}

.accent { color: var(--accent); }

/* ---- Fade-in Animations ---- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-in-delay { transition-delay: 0.2s; }

/* ======================================================
   NAVIGATION
   ====================================================== */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: background var(--transition), backdrop-filter var(--transition), border-color var(--transition);
}

#navbar.scrolled {
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  flex-shrink: 0;
}

.nav-logo img {
  height: 32px;
  width: 32px;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  margin-left: auto;
}

.nav-links a {
  font-size: 15px;
  color: var(--text-muted);
  font-weight: 500;
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--text); }

.nav-cta { margin-left: 16px; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  display: none;
  padding: 16px 24px 24px;
  border-top: 1px solid var(--border);
  background: rgba(10, 10, 15, 0.95);
}
.mobile-menu.open { display: block; }
.mobile-menu ul { display: flex; flex-direction: column; gap: 16px; }
.mobile-menu a { font-size: 16px; color: var(--text-muted); font-weight: 500; }
.mobile-menu .btn { display: inline-flex; width: fit-content; }

/* ======================================================
   HERO
   ====================================================== */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(ellipse at center, rgba(233, 30, 140, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

#hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(233, 30, 140, 0.12);
  border: 1px solid rgba(233, 30, 140, 0.3);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 50px;
  margin-bottom: 24px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hero-content h1 {
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero-sub {
  font-size: 18px;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 480px;
  margin-bottom: 40px;
}

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

.hero-img-wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow:
    0 0 0 1px var(--border),
    0 40px 80px rgba(0, 0, 0, 0.6),
    0 0 60px var(--accent-glow);
  transform: perspective(1000px) rotateY(-5deg) rotateX(2deg);
  transition: transform 0.4s ease;
}
.hero-img-wrapper:hover {
  transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
}
.hero-img-wrapper img { width: 100%; }

/* ======================================================
   FEATURES
   ====================================================== */
#features {
  padding: 120px 0;
  background: linear-gradient(180deg, var(--bg) 0%, #0f0f1a 100%);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.feature-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 30px var(--accent-glow);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: rgba(233, 30, 140, 0.12);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.6;
}

.feature-img {
  margin-top: 8px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  flex-grow: 1;
}

.feature-img img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  object-position: top;
  transition: transform 0.4s ease;
}
.feature-card:hover .feature-img img { transform: scale(1.03); }

/* ======================================================
   HOW IT WORKS
   ====================================================== */
#how-it-works {
  padding: 120px 0;
}

.steps { display: flex; flex-direction: column; gap: 80px; }

.step {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.step-reverse { direction: rtl; }
.step-reverse > * { direction: ltr; }

.step-number {
  font-size: 72px;
  font-weight: 900;
  line-height: 1;
  color: var(--accent);
  opacity: 0.15;
  margin-bottom: 8px;
  font-variant-numeric: tabular-nums;
}

.step-content h3 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.2;
}

.step-content p {
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 20px;
}

.step-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.step-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 15px;
}
.step-list li::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

.step-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5);
}
.step-image img { width: 100%; }

/* ======================================================
   BOOKMARK MANAGEMENT
   ====================================================== */
#management {
  padding: 120px 0;
  background: #0f0f1a;
}

.management-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.management-text h2 {
  font-size: clamp(26px, 3.5vw, 40px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}

.management-sub {
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 32px;
}

.check-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.check-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.5;
}

.check-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  background: rgba(233, 30, 140, 0.12);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-top: 1px;
}

/* Image Tabs */
.img-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.img-tab {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 8px 16px;
  border-radius: 8px;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}
.img-tab:hover { border-color: var(--accent); color: var(--text); }
.img-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.img-panels { position: relative; }

.img-panel {
  display: none;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.4);
}
.img-panel.active { display: block; }
.img-panel img { width: 100%; }

/* ======================================================
   VIEWS SHOWCASE
   ====================================================== */
#views {
  padding: 120px 0;
}

.views-switcher { max-width: 900px; margin: 0 auto; }

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

.view-tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 10px 20px;
  border-radius: 10px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}
.view-tab:hover { border-color: var(--accent); color: var(--text); }
.view-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.view-display { position: relative; }

.view-panel {
  display: none;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow:
    0 40px 80px rgba(0, 0, 0, 0.5),
    0 0 40px var(--accent-glow);
}
.view-panel.active { display: block; }
.view-panel img { width: 100%; }

/* ======================================================
   DEMO VIDEO
   ====================================================== */
#demo {
  padding: 120px 0;
  background: linear-gradient(180deg, var(--bg) 0%, #0f0f1a 50%, var(--bg) 100%);
}

.video-wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 40px 80px rgba(0, 0, 0, 0.6);
  cursor: pointer;
}

.video-wrapper video {
  width: 100%;
  display: block;
}

.video-overlay {
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 15, 0.65);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  transition: all var(--transition);
}
.video-overlay.hidden { opacity: 0; pointer-events: none; }

.play-btn {
  width: 80px;
  height: 80px;
  background: var(--accent);
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 0 40px var(--accent-glow);
}
.play-btn:hover {
  transform: scale(1.1);
  background: var(--accent-dark);
  box-shadow: 0 0 60px rgba(233, 30, 140, 0.5);
}
.play-btn svg { margin-left: 4px; }

.video-overlay p {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-muted);
}

/* ======================================================
   CTA SECTION
   ====================================================== */
#cta {
  padding: 120px 0;
  position: relative;
  overflow: hidden;
  text-align: center;
}

.cta-bg-pattern {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(233, 30, 140, 0.2) 0%, transparent 60%),
    radial-gradient(ellipse at 50% 100%, rgba(233, 30, 140, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

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

.cta-content h2 {
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 900;
  margin-bottom: 20px;
  line-height: 1.1;
}

.cta-content p {
  color: var(--text-muted);
  font-size: 18px;
  max-width: 520px;
  margin: 0 auto 40px;
  line-height: 1.6;
}

.cta-note {
  margin-top: 20px !important;
  font-size: 14px !important;
  color: #6b6b88 !important;
}

/* ======================================================
   FOOTER
   ====================================================== */
#footer {
  background: #07070e;
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 64px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 14px;
  margin-top: 12px;
  max-width: 280px;
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: 64px;
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

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

.footer-col a {
  color: var(--text-muted);
  font-size: 14px;
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--text); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-bottom p {
  font-size: 13px;
  color: #4a4a60;
}

/* ======================================================
   RESPONSIVE — Tablet (≤1023px)
   ====================================================== */
@media (max-width: 1023px) {
  .nav-links, .nav-cta { display: none; }
  .hamburger { display: flex; }

  #hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-content { order: 2; }
  .hero-image { order: 1; }
  .hero-sub { max-width: 100%; }
  .hero-actions { justify-content: center; }
  .hero-img-wrapper { transform: none; max-width: 500px; margin: 0 auto; }

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

  .step, .step-reverse {
    grid-template-columns: 1fr;
    direction: ltr;
    gap: 32px;
  }
  .step-reverse .step-image { order: -1; }

  .management-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

/* ======================================================
   RESPONSIVE — Mobile (≤767px)
   ====================================================== */
@media (max-width: 767px) {
  .features-grid { grid-template-columns: 1fr; }

  .steps { gap: 56px; }
  .step-number { font-size: 48px; }

  .footer-links { flex-direction: column; gap: 32px; }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .view-tabs { gap: 8px; }
  .view-tab { padding: 8px 14px; font-size: 13px; }

  .img-tabs { gap: 6px; }
  .img-tab { font-size: 12px; padding: 7px 12px; }

  #hero { padding: 100px 0 64px; }

  .hero-content h1 { font-size: 36px; }

  .section-header { margin-bottom: 40px; }

  #features, #how-it-works, #management, #views, #demo, #cta { padding: 80px 0; }
}

/* ======================================================
   SCROLLBAR
   ====================================================== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border-hover); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }