/* ===== CSS Variables ===== */
:root {
  --primary: #4A90D9;
  --primary-hover: #3A7BC8;
  --secondary: #7EC8A0;
  --text: #2C3E50;
  --text-secondary: #7F8C8D;
  --text-muted: #AAB2BD;
  --glass-bg: rgba(255, 255, 255, 0.5);
  --glass-bg-hover: rgba(255, 255, 255, 0.65);
  --glass-border: rgba(255, 255, 255, 0.7);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
  --glass-shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
}

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

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

body {
  font-family: var(--font);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  background: #F0F4F8;
  overflow-x: hidden;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

/* ===== Decorative Blobs (removed for perf — replaced by solid bg) ===== */

/* ===== Glass Utility ===== */
.glass {
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

/* ===== Navigation ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}


.nav-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
}

.nav-brand:hover {
  text-decoration: none;
  opacity: 0.85;
}

.nav-logo-img {
  width: 34px;
  height: 34px;
  border-radius: 8px;
}

.nav-links {
  display: flex;
  gap: 8px;
}

.nav-links a {
  padding: 8px 18px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.nav-links a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.4);
  text-decoration: none;
}

.nav-links a.active {
  color: var(--primary);
  background: rgba(74, 144, 217, 0.1);
}

/* ===== Page Wrapper ===== */
.page {
  position: relative;
  z-index: 1;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Section scroll offset for sticky nav ===== */
section[id] {
  scroll-margin-top: 70px;
}

/* ===== Hero ===== */
.hero {
  text-align: center;
  padding: 24px;
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  scroll-snap-align: start;
  scroll-snap-stop: always;
}

.hero-logo {
  width: 88px;
  height: 88px;
  border-radius: 20px;
  margin: 0 auto 20px;
  box-shadow: 0 8px 32px rgba(74, 144, 217, 0.25);
}

.hero-title {
  font-size: 38px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.btn-primary {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary), #5BA0E8);
  color: white;
  border: none;
  padding: 14px 40px;
  border-radius: 50px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(74, 144, 217, 0.35);
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
  transform: scale(1.04);
  box-shadow: 0 6px 24px rgba(74, 144, 217, 0.45);
  text-decoration: none;
}

.btn-outline {
  display: inline-block;
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  padding: 12px 32px;
  border-radius: 50px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-outline:hover {
  background: var(--primary);
  color: white;
  text-decoration: none;
}

.hero-version {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 10px;
}

/* ===== Feature Blocks (large color blocks) ===== */
.feature-blocks {
  position: relative;
  z-index: 1;
}

.feature-block {
  position: relative;
  overflow: hidden;
  min-height: 100vh;
  display: flex;
  align-items: center;
  scroll-snap-align: start;
  scroll-snap-stop: always;
}

.feature-block-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 56px 32px;
  display: flex;
  align-items: center;
  gap: 32px;
  width: 100%;
}

.feature-block-icon {
  flex-shrink: 0;
  width: 100px;
  height: 100px;
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.2);
}

.feature-block-text h2 {
  font-size: 26px;
  font-weight: 800;
  margin-bottom: 8px;
  color: white;
}

.feature-block-text p {
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.85);
  max-width: 520px;
}

/* Color variants — muted / low saturation */
.feature-block--blue {
  background: linear-gradient(135deg, #7AACC8 0%, #6A9CB8 50%, #8AB8D4 100%);
}

.feature-block--green {
  background: linear-gradient(135deg, #8CB89E 0%, #7AAA8E 50%, #9CC8AE 100%);
}

.feature-block--orange {
  background: linear-gradient(135deg, #C8A080 0%, #B89070 50%, #D4B090 100%);
}

/* Decorative circles inside blocks */
.feature-block::before {
  content: '';
  position: absolute;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  top: -80px;
  right: -60px;
  pointer-events: none;
}

.feature-block::after {
  content: '';
  position: absolute;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.04);
  bottom: -50px;
  left: 10%;
  pointer-events: none;
}

/* ===== Screenshots ===== */
.screenshots {
  scroll-snap-align: start;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  position: relative;
  z-index: 1;
}

.screenshots h2 {
  font-size: 22px;
  color: var(--text);
  margin-bottom: 32px;
}

.screenshots-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  max-width: 900px;
  width: 100%;
}

.shot-group {
  display: flex;
  align-items: center;
  gap: 20px;
}

.shot-label {
  font-size: 15px;
  color: var(--text-secondary);
  text-align: center;
  line-height: 1.7;
  max-width: 120px;
}

.screenshot-card {
  width: 200px;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: var(--glass-shadow);
  transition: transform 0.25s;
  background: var(--glass-bg);
  flex-shrink: 0;
}

.screenshot-card:hover {
  transform: translateY(-4px) scale(1.02);
}

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

.screenshot-placeholder {
  width: 100%;
  aspect-ratio: 9 / 18;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 14px;
  border: 2px dashed rgba(0, 0, 0, 0.08);
  border-radius: 24px;
  background: var(--glass-bg);
}

/* ===== Footer ===== */
.footer {
  scroll-snap-align: start;
  text-align: center;
  padding: 20px 24px;
  border-top: 1px solid rgba(0, 0, 0, 0.05);
  position: relative;
  z-index: 1;
}

.footer p {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 2px;
}

/* ===== Content Card (download / about pages) ===== */
/* Snap for lower sections */
#download-section {
  scroll-snap-align: start;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.content-card {
  border-radius: var(--radius-lg);
  padding: 36px;
  margin: 40px auto 32px;
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.content-card h1 {
  font-size: 28px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 24px;
}

.content-card h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin: 28px 0 12px;
}

.content-card p {
  color: var(--text-secondary);
  margin-bottom: 12px;
  line-height: 1.7;
}

.content-card ul {
  list-style: none;
  padding: 0;
}

.content-card ul li {
  padding: 6px 0 6px 24px;
  color: var(--text-secondary);
  position: relative;
}

.content-card ul li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 14px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
}

/* Side-by-side layout for download + about */
.side-by-side {
  display: grid !important;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: stretch;
  width: 100%;
  max-width: 1060px;
  padding: 40px 24px;
}

.side-by-side .content-card {
  margin: 0 !important;
  max-width: none !important;
}

/* ===== Version Info ===== */
.version-info {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  margin: 20px 0 28px;
}

.version-item {
  text-align: center;
}

.version-item .value {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary);
}

.version-item .label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ===== Download Button Large ===== */
.download-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin: 28px 0;
}

/* ===== Changelog ===== */
.changelog {
  margin: 24px 0;
}

.changelog li {
  padding: 8px 0 8px 24px;
  position: relative;
  color: var(--text-secondary);
  font-size: 14px;
}

.changelog li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 15px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--secondary);
}

/* ===== About Credits ===== */
.credits-list {
  margin: 12px 0;
}

.credits-list li {
  padding: 8px 0 8px 24px;
}

/* ===== Tech Tags ===== */
.tech-tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 12px 0;
}

.tech-tag {
  background: rgba(74, 144, 217, 0.1);
  color: var(--primary);
  padding: 6px 14px;
  border-radius: 50px;
  font-size: 13px;
  font-weight: 600;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-inner {
    flex-direction: column;
    gap: 10px;
    padding: 10px 16px;
  }

  .hero-logo {
    width: 68px;
    height: 68px;
  }

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

  .hero-subtitle {
    font-size: 15px;
  }

  .feature-block-inner {
    flex-direction: column;
    text-align: center;
    padding: 40px 24px;
    gap: 20px;
  }

  .feature-block-icon {
    width: 80px;
    height: 80px;
    border-radius: 20px;
  }

  .feature-block-text h2 {
    font-size: 22px;
  }

  .feature-block-text p {
    font-size: 14px;
    max-width: 100%;
  }

  .screenshots-row {
    flex-direction: column;
    gap: 20px;
  }

  .screenshot-card {
    width: 160px;
  }

  .version-info {
    gap: 20px;
  }

  .download-actions {
    flex-direction: column;
  }

  .side-by-side {
    grid-template-columns: 1fr;
  }

  .side-by-side-row {
    flex-direction: column !important;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 24px;
  }

  .hero-subtitle {
    font-size: 14px;
  }

  .feature-block-inner {
    padding: 32px 20px;
  }

  .feature-block-text h2 {
    font-size: 20px;
  }

  .screenshots-grid {
    flex-direction: column;
    align-items: center;
  }

  .screenshot-card {
    width: 180px;
  }

  .nav-links a {
    padding: 6px 14px;
    font-size: 13px;
  }
}