/* ============================================
   Dusk Marketing Website — style.css
   ============================================ */

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

:root {
  /* Dusk (Dark) */
  --bg: #090A0F;
  --surface: #161824;
  --border: rgba(255, 255, 255, 0.05);
  --text-primary: #F2F2F7;
  --text-secondary: #8E95A8;
  --glass-bg: rgba(22, 24, 36, 0.6);
  --nav-bg: rgba(9, 10, 15, 0.8);
  --hero-glow: rgba(255, 107, 74, 0.08);
  --card-hover-border: rgba(255, 255, 255, 0.1);
  --badge-bg: rgba(255, 255, 255, 0.06);
  --badge-text: #8E95A8;
  --switch-bg: rgba(255, 255, 255, 0.08);
  --switch-knob: #F2F2F7;
  --switch-knob-shadow: rgba(0, 0, 0, 0.3);

  /* Shared */
  --accent: #FF6B4A;
  --accent-hover: #FF8266;
  --accent-glow: rgba(255, 107, 74, 0.3);
  --radius-card: 28px;
  --radius-button: 100px;
  --radius-poster: 16px;
  --max-width: 1120px;
  --transition: 0.3s ease;
}

[data-theme="light"] {
  --bg: #F5F7FA;
  --surface: #FFFFFF;
  --border: rgba(0, 0, 0, 0.05);
  --text-primary: #1C1C1E;
  --text-secondary: #636366;
  --glass-bg: rgba(255, 255, 255, 0.6);
  --nav-bg: rgba(245, 247, 250, 0.8);
  --hero-glow: rgba(255, 107, 74, 0.06);
  --card-hover-border: rgba(0, 0, 0, 0.1);
  --badge-bg: rgba(0, 0, 0, 0.04);
  --badge-text: #636366;
  --switch-bg: rgba(0, 0, 0, 0.08);
  --switch-knob: #FFFFFF;
  --switch-knob-shadow: rgba(0, 0, 0, 0.12);
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text',
               'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

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

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

/* --- Nav --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0 32px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--nav-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav-brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

/* --- Theme Switch (Single-label animated toggle) --- */
.theme-switch {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  padding: 6px 0;
}

.theme-switch-label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-secondary);
  position: relative;
  overflow: hidden;
  width: 38px;
  height: 18px;
}

.theme-switch-label-inner {
  display: flex;
  flex-direction: column;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] .theme-switch-label-inner {
  transform: translateY(-50%);
}

.theme-switch-label-text {
  height: 18px;
  line-height: 18px;
}

.theme-switch-track {
  position: relative;
  width: 52px;
  height: 28px;
  background: var(--switch-bg);
  border: 1px solid var(--border);
  border-radius: 100px;
  transition: background var(--transition), border-color var(--transition);
  flex-shrink: 0;
}

.theme-switch:hover .theme-switch-track {
  border-color: var(--card-hover-border);
}

.theme-switch-knob {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--switch-knob);
  box-shadow: 0 1px 4px var(--switch-knob-shadow);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1),
              background var(--transition),
              box-shadow var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

[data-theme="dark"] .theme-switch-knob {
  transform: translateX(24px);
}

.theme-switch-knob svg {
  width: 12px;
  height: 12px;
  position: absolute;
  transition: opacity 0.3s ease, transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.theme-switch-icon-sun {
  color: #FF9500;
}

.theme-switch-icon-moon {
  color: #636680;
}

/* Show/hide the correct icon */
[data-theme="light"] .theme-switch-icon-sun {
  opacity: 1;
  transform: rotate(0deg);
}
[data-theme="light"] .theme-switch-icon-moon {
  opacity: 0;
  transform: rotate(90deg);
}
[data-theme="dark"] .theme-switch-icon-sun {
  opacity: 0;
  transform: rotate(-90deg);
}
[data-theme="dark"] .theme-switch-icon-moon {
  opacity: 1;
  transform: rotate(0deg);
}

.theme-switch:focus-visible .theme-switch-track {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* --- Hero --- */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 64px;
  padding: 160px 24px 100px;
  max-width: var(--max-width);
  margin: 0 auto;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  left: 30%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--hero-glow) 0%, transparent 70%);
  pointer-events: none;
}

.hero-left {
  position: relative;
  z-index: 1;
  flex: 1;
  min-width: 0;
}

.hero-icon {
  width: 88px;
  height: 88px;
  border-radius: 20px;
  margin-bottom: 0;
  margin-left: -16px;
}

.hero h1 {
  font-size: clamp(40px, 5vw, 60px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 16px;
}

.hero h1 .accent {
  color: var(--accent);
}

.hero-tagline {
  font-size: clamp(18px, 2vw, 22px);
  color: var(--text-secondary);
  max-width: 400px;
  margin-bottom: 40px;
}

.hero-ctas {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-button);
  font-size: 16px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 8px 32px var(--accent-glow);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--badge-bg);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--card-hover-border);
  transform: translateY(-1px);
}

.btn svg {
  flex-shrink: 0;
}

.btn-disabled {
  opacity: 0.45;
  cursor: default;
  pointer-events: none;
}

.app-store-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.coming-soon-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
}

/* --- Hero Screenshot --- */
.hero-right {
  position: relative;
  z-index: 1;
  flex: 1;
  min-width: 0;
  max-width: 480px;
}

.hero-screenshot-placeholder {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 80px 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--text-secondary);
  transition: background var(--transition), border-color var(--transition);
  aspect-ratio: 9 / 16;
  max-height: 520px;
  justify-content: center;
}

.hero-screenshot-placeholder svg {
  opacity: 0.3;
}

.hero-screenshot-placeholder p {
  font-size: 15px;
}

/* --- Features --- */
.features {
  padding: 80px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.features-header {
  text-align: center;
  margin-bottom: 56px;
}

.features-header h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.features-header p {
  color: var(--text-secondary);
  font-size: 18px;
  max-width: 480px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 36px 28px;
  transition: all var(--transition);
}

.feature-card:hover {
  border-color: var(--card-hover-border);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: rgba(255, 107, 74, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 22px;
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
}

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

/* --- Tech Specs --- */
.specs {
  padding: 40px 24px 80px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.specs-row {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.spec-badge {
  background: var(--badge-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-button);
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 600;
  color: var(--badge-text);
  letter-spacing: -0.01em;
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, Menlo, monospace;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

/* --- Open Source --- */
.open-source {
  padding: 0 24px 80px;
  text-align: center;
  max-width: var(--max-width);
  margin: 0 auto;
}

.open-source-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 56px 40px;
  transition: border-color var(--transition), background var(--transition);
}

.open-source-card:hover {
  border-color: var(--card-hover-border);
}

.open-source h2 {
  font-size: clamp(24px, 3.5vw, 32px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.open-source p {
  color: var(--text-secondary);
  font-size: 17px;
  max-width: 520px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.open-source-ctas {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* --- Footer --- */
.footer {
  padding: 40px 24px;
  text-align: center;
  border-top: 1px solid var(--border);
  margin-top: 40px;
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-left {
  color: var(--text-secondary);
  font-size: 14px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 14px;
  transition: color var(--transition);
}

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

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* stagger children */
.features-grid .feature-card:nth-child(1) { transition-delay: 0.0s; }
.features-grid .feature-card:nth-child(2) { transition-delay: 0.08s; }
.features-grid .feature-card:nth-child(3) { transition-delay: 0.16s; }
.features-grid .feature-card:nth-child(4) { transition-delay: 0.24s; }
.features-grid .feature-card:nth-child(5) { transition-delay: 0.32s; }
.features-grid .feature-card:nth-child(6) { transition-delay: 0.40s; }

/* --- Responsive --- */
@media (max-width: 900px) {
  .hero {
    flex-direction: column;
    text-align: center;
    padding: 140px 24px 80px;
    gap: 48px;
  }

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

  .hero-tagline {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-ctas {
    justify-content: center;
  }

  .hero-right {
    max-width: 320px;
    width: 100%;
  }

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

@media (max-width: 640px) {
  .nav {
    padding: 0 16px;
  }

  .hero {
    padding: 120px 20px 60px;
  }

  .hero-icon {
    width: 44px;
    height: 44px;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .feature-card {
    padding: 28px 24px;
  }

  .hero-ctas {
    flex-direction: column;
    align-items: center;
    width: 100%;
  }

  .hero-ctas .btn {
    width: 100%;
    justify-content: center;
  }

  .app-store-wrapper {
    width: 100%;
  }

  .hero-right {
    max-width: 260px;
  }

  .hero-screenshot-placeholder {
    padding: 56px 24px;
    border-radius: 20px;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }

  .open-source-card {
    padding: 40px 24px;
  }

  .open-source-ctas {
    flex-direction: column;
    align-items: center;
  }

  .specs-row {
    gap: 8px;
  }

  .spec-badge {
    padding: 8px 16px;
    font-size: 12px;
  }

  .theme-switch-label {
    display: none;
  }
}