:root {
  --primary: #3482FF;
  --primary-dark: #2968CC;
  --bg: #F7F7F7;
  --bg-dark: #0A0A0A;
  --text: #1A1A1A;
  --text-secondary: #666;
  --text-muted: #999;
  --card-bg: #FFFFFF;
  --radius: 20px;
  --radius-sm: 12px;
  --radius-xs: 8px;
}

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

html {
  scroll-behavior: smooth;
  scroll-snap-type: y mandatory;
  overflow-y: scroll;
  overflow-x: hidden;
}

body {
  font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

/* ===== NAVBAR ===== */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 40px;
  height: 60px;
  display: flex;
  align-items: center;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  background: rgba(247, 247, 247, 0);
  backdrop-filter: blur(0px);
  transform: translateY(-100%);
  opacity: 0;
}

#navbar.visible {
  transform: translateY(0);
  opacity: 1;
  background: rgba(247, 247, 247, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
}

#navbar.dark {
  background: rgba(10, 10, 10, 0.85);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

#navbar.dark .nav-title,
#navbar.dark .nav-links a {
  color: #fff;
}

.nav-inner {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.nav-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* ===== SECTIONS ===== */
.section {
  min-height: 100vh;
  width: 100%;
  scroll-snap-align: start;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.section-content {
  max-width: 1100px;
  width: 100%;
  padding: 80px 40px;
}

/* ===== HERO ===== */
.hero-section {
  background: var(--bg);
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.hero-icon-wrapper {
  margin-bottom: 32px;
}

.hero-icon {
  width: 120px;
  height: 120px;
  border-radius: 28px;
  box-shadow: 0 20px 60px rgba(52, 130, 255, 0.25);
}

.hero-title {
  font-size: 72px;
  font-weight: 900;
  letter-spacing: -2px;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #1A1A1A 0%, #333 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 24px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.hero-desc {
  font-size: 16px;
  color: var(--text-muted);
  margin-bottom: 60px;
}

.scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.scroll-arrow {
  width: 24px;
  height: 24px;
  border-right: 2px solid var(--text-muted);
  border-bottom: 2px solid var(--text-muted);
  transform: rotate(45deg);
  animation: bounce-down 2s infinite;
}

@keyframes bounce-down {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0) rotate(45deg); }
  40% { transform: translateY(8px) rotate(45deg); }
  60% { transform: translateY(4px) rotate(45deg); }
}

/* ===== FEATURE LAYOUT ===== */
.feature-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.feature-layout.reverse {
  direction: rtl;
}

.feature-layout.reverse > * {
  direction: ltr;
}

.feature-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  background: rgba(52, 130, 255, 0.08);
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}

.feature-title {
  font-size: 44px;
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.2;
  margin-bottom: 16px;
}

.feature-desc {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* ===== PHONE MOCKUP ===== */
.phone-mockup {
  width: 280px;
  margin: 0 auto;
  background: #1A1A1A;
  border-radius: 36px;
  padding: 12px;
  box-shadow:
    0 40px 80px rgba(0, 0, 0, 0.2),
    0 0 0 1px rgba(255, 255, 255, 0.1) inset;
}

.phone-screen {
  border-radius: 26px;
  overflow: hidden;
  background: var(--bg);
  aspect-ratio: 9/19.5;
}

.phone-screenshot {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
}

/* ===== STYLE COMPARE ===== */
.style-section .section-content {
  text-align: center;
}

.section-title {
  font-size: 44px;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 8px;
}

.section-subtitle {
  font-size: 17px;
  color: var(--text-muted);
  margin-bottom: 48px;
}

.style-compare {
  display: flex;
  gap: 32px;
  justify-content: center;
}

.style-card {
  flex: 1;
  max-width: 340px;
}

.style-card-image {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.12);
}

.style-card-image img {
  width: 100%;
  display: block;
}

.style-label, .layout-label {
  margin-top: 16px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
}

/* ===== LAYOUT COMPARE ===== */
.layout-section .section-content {
  text-align: center;
}

.layout-compare {
  display: flex;
  gap: 40px;
  justify-content: center;
}

.layout-item {
  flex: 1;
  max-width: 300px;
}

.layout-mockup {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.1);
  min-height: 280px;
}

.large-layout {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.large-layout .layout-card-demo {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.large-layout .layout-card-demo.compact {
  padding: 14px 16px;
}

.large-layout .layout-card-demo.compact .ld-text {
  gap: 4px;
}

.large-layout .layout-card-demo.compact .ld-title {
  height: 12px;
}

.large-layout .layout-card-demo.compact .ld-days {
  height: 16px;
}

.ld-img {
  width: 100%;
  height: 120px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: var(--radius-xs);
}

.ld-text {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.ld-title {
  width: 60%;
  height: 14px;
  background: #E0E0E0;
  border-radius: 4px;
}

.ld-days {
  width: 40%;
  height: 20px;
  background: var(--primary);
  border-radius: 4px;
  opacity: 0.6;
}

.grid-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto;
  gap: 10px;
}

.grid-layout .layout-card-demo.large {
  grid-column: 1 / -1;
  padding: 16px;
}

.grid-layout .layout-card-demo.large .ld-img {
  height: 120px;
}

.grid-layout .layout-card-demo {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.grid-layout .layout-card-demo.large {
  gap: 10px;
}

.grid-layout .ld-img {
  height: 60px;
}

.grid-layout .ld-title {
  width: 70%;
  height: 8px;
}

.grid-layout .ld-days {
  width: 50%;
  height: 10px;
}

.grid-layout .layout-card-demo.large .ld-title {
  width: 60%;
  height: 14px;
}

.grid-layout .layout-card-demo.large .ld-days {
  width: 40%;
  height: 20px;
}

/* ===== PIN SECTION ===== */
.pin-animation-demo {
  position: relative;
  width: 320px;
  height: 360px;
  margin: 0 auto;
}

.pin-card {
  position: absolute;
  left: 0;
  right: 0;
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  padding: 20px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.pin-1 {
  top: 0;
  z-index: 3;
  transform: translateY(0) scale(1);
}

.pin-2 {
  top: 80px;
  z-index: 2;
  opacity: 0.7;
  transform: scale(0.95);
}

.pin-3 {
  top: 150px;
  z-index: 1;
  opacity: 0.4;
  transform: scale(0.9);
}

.pin-card-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 16px;
  font-weight: 600;
}

.pin-days {
  color: var(--primary);
  font-size: 14px;
  font-weight: 700;
}

.pin-indicator {
  position: absolute;
  top: -12px;
  right: -12px;
  background: var(--card-bg);
  border-radius: 20px;
  padding: 6px 14px;
  display: flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
  font-size: 13px;
  font-weight: 600;
  color: #FF9500;
  z-index: 10;
  animation: pin-bounce 2s infinite;
}

@keyframes pin-bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

/* ===== REORDER SECTION ===== */
.reorder-demo {
  width: 320px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.reorder-item {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  font-size: 16px;
  font-weight: 600;
  transition: transform 0.3s ease;
  position: relative;
}

.reorder-item:hover {
  transform: translateX(8px);
}

.reorder-color {
  width: 8px;
  height: 36px;
  border-radius: 4px;
  flex-shrink: 0;
}

.reorder-dragging {
  animation: reorder-drag 5s ease-in-out infinite;
  z-index: 2;
}

.reorder-item:nth-child(3) {
  animation: reorder-shift-up 5s ease-in-out infinite;
}

@keyframes reorder-drag {
  0%, 10% {
    transform: scale(1) translateY(0);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  }
  15% {
    transform: scale(1.08) translateY(0);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
  }
  30% {
    transform: scale(1.08) translateY(82px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
  }
  50%, 85% {
    transform: scale(1) translateY(82px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  }
  95%, 100% {
    transform: scale(1) translateY(0);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  }
}

@keyframes reorder-shift-up {
  0%, 30% {
    transform: translateY(0);
  }
  50%, 85% {
    transform: translateY(-82px);
  }
  95%, 100% {
    transform: translateY(0);
  }
}

/* ===== BLUR SECTION ===== */
.blur-demo {
  display: flex;
  justify-content: center;
}

.blur-card {
  width: 300px;
  height: 200px;
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
}

.blur-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  background-size: cover;
  background-position: center;
}

.blur-overlay {
  position: absolute;
  inset: 0;
  backdrop-filter: blur(16px);
  background: rgba(255, 255, 255, 0.15);
}

.blur-content {
  position: relative;
  z-index: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 24px;
}

.blur-title {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}

.blur-days {
  font-size: 28px;
  font-weight: 800;
  color: #fff;
}

/* ===== DOWNLOAD SECTION ===== */
.download-section {
  background: var(--bg-dark);
}

.download-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.download-icon {
  width: 100px;
  height: 100px;
  border-radius: 24px;
  margin-bottom: 32px;
  box-shadow: 0 20px 60px rgba(52, 130, 255, 0.3);
}

.download-title {
  font-size: 44px;
  font-weight: 800;
  color: #fff;
  letter-spacing: -1px;
  margin-bottom: 8px;
}

.download-subtitle {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 40px;
}

.download-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--primary);
  color: #fff;
  text-decoration: none;
  font-size: 17px;
  font-weight: 600;
  padding: 16px 40px;
  border-radius: 50px;
  transition: all 0.3s ease;
  box-shadow: 0 8px 30px rgba(52, 130, 255, 0.4);
}

.download-btn:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(52, 130, 255, 0.5);
}

.download-btn svg {
  width: 20px;
  height: 20px;
}

.version-info {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.3);
}

.download-links {
  margin-bottom: 40px;
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 10px 20px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 50px;
  transition: all 0.3s ease;
}

.github-link:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.05);
}

.copyright {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.2);
}

/* ===== ANIMATION CLASSES ===== */
.anim-fade-up,
.anim-fade-scale,
.anim-slide-right,
.anim-slide-left,
.anim-slide-up,
.anim-scale-in {
  opacity: 0;
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.anim-fade-up { transform: translateY(40px); }
.anim-fade-scale { transform: scale(0.9); }
.anim-slide-right { transform: translateX(-60px); }
.anim-slide-left { transform: translateX(60px); }
.anim-slide-up { transform: translateY(60px); }
.anim-scale-in { transform: scale(0.7); }

/* Triggered */
.anim-fade-up.visible,
.anim-fade-scale.visible,
.anim-slide-right.visible,
.anim-slide-left.visible,
.anim-slide-up.visible,
.anim-scale-in.visible {
  opacity: 1;
  transform: translate(0) scale(1);
}

.delay-1 { transition-delay: 0.15s; }
.delay-2 { transition-delay: 0.3s; }
.delay-3 { transition-delay: 0.45s; }
.delay-4 { transition-delay: 0.6s; }
.delay-5 { transition-delay: 0.75s; }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .section-content {
    padding: 60px 24px;
  }

  .hero-title {
    font-size: 52px;
  }

  .hero-subtitle {
    font-size: 20px;
  }

  .feature-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .feature-layout.reverse {
    direction: ltr;
  }

  .feature-visual {
    order: -1;
  }

  .feature-title {
    font-size: 32px;
  }

  .section-title {
    font-size: 32px;
  }

  .phone-mockup {
    width: 240px;
  }

  .style-compare {
    flex-direction: column;
    align-items: center;
  }

  .style-card {
    max-width: 340px;
    width: 100%;
  }

  .style-card-image img {
    height: auto;
  }

  .layout-compare {
    flex-direction: column;
    align-items: center;
  }

  .layout-item {
    max-width: 300px;
    width: 100%;
  }

  .pin-animation-demo {
    width: 280px;
    height: 320px;
  }

  .reorder-demo {
    width: 280px;
  }

  .download-title {
    font-size: 32px;
  }

  #navbar {
    padding: 0 20px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 40px;
  }

  .hero-icon {
    width: 96px;
    height: 96px;
    border-radius: 22px;
  }

  .feature-title {
    font-size: 28px;
  }

  .section-title {
    font-size: 28px;
  }

  .style-card-image {
    border-radius: 16px;
  }

  .download-title {
    font-size: 28px;
  }

  .download-btn {
    padding: 14px 32px;
    font-size: 16px;
  }
}