/* ==========================================================================
   Isochron Landing Page Stylesheet
   Atelier Sonic Design System (Exact App Colors from AppTheme)
   ========================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", monospace;

  /* AppTheme Light Palette */
  --bg-primary: #f9f9ff;                    /* lightBg / lightSurface */
  --bg-secondary: #ffffff;                  /* pure card surface */
  --bg-tertiary: #f0f3ff;                   /* lightSurfaceContainerLow */
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: #ffffff;
  --bg-glass: rgba(249, 249, 255, 0.85);

  --text-primary: #111c2d;                  /* lightOnSurface */
  --text-secondary: #3d4947;                /* lightOnSurfaceVariant */
  --text-muted: #6d7a77;                    /* lightOutline */

  --border-light: #d8e3fb;                  /* lightSurfaceContainerHighest */
  --border-medium: #bcc9c6;                 /* lightOutlineVariant */
  --border-focus: #00685f;

  --accent-primary: #00685f;                /* Forest Mint (primary) */
  --accent-primary-hover: #005049;
  --accent-glow: rgba(0, 104, 95, 0.22);
  --accent-gradient: linear-gradient(135deg, #00685f 0%, #0d9488 100%);
  --accent-destructive: #ac3400;           /* Terracotta */
  --accent-warning: #825100;               /* Amber Gold */
  --accent-playhead: #825100;

  --card-shadow: 0 10px 25px -5px rgba(17, 28, 45, 0.05), 0 8px 10px -6px rgba(17, 28, 45, 0.03);
  --window-shadow: 0 25px 60px -15px rgba(17, 28, 45, 0.15), 0 0 0 1px #d8e3fb;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --container-max: 1160px;
}

[data-theme="dark"] {
  /* AppTheme Dark Palette */
  --bg-primary: #111c2d;                    /* darkBg */
  --bg-secondary: #1e293b;                  /* darkSurface */
  --bg-tertiary: #172235;                   /* darkSurfaceContainerLow */
  --bg-card: rgba(30, 41, 59, 0.85);
  --bg-card-hover: rgba(36, 50, 72, 0.95);
  --bg-glass: rgba(17, 28, 45, 0.85);

  --text-primary: #ecf1ff;                  /* darkOnSurface */
  --text-secondary: #bcc9c6;                /* darkOnSurfaceVariant */
  --text-muted: #6d7a77;                    /* darkOutline */

  --border-light: rgba(255, 255, 255, 0.09);
  --border-medium: rgba(255, 255, 255, 0.16);
  --border-focus: #6bd8cb;

  --accent-primary: #6bd8cb;                /* Mint / Teal light */
  --accent-primary-hover: #85e3d8;
  --accent-glow: rgba(107, 216, 203, 0.28);
  --accent-gradient: linear-gradient(135deg, #6bd8cb 0%, #2dd4bf 100%);
  --accent-destructive: #fd6b36;           /* Terracotta bright */
  --accent-warning: #e9c46a;               /* Gold */
  --accent-playhead: #ffa300;              /* Amber Gold */

  --card-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.45);
  --window-shadow: 0 30px 80px -20px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(255, 255, 255, 0.12);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-primary: #111c2d;
    --bg-secondary: #1e293b;
    --bg-tertiary: #172235;
    --bg-card: rgba(30, 41, 59, 0.85);
    --bg-card-hover: rgba(36, 50, 72, 0.95);
    --bg-glass: rgba(17, 28, 45, 0.85);

    --text-primary: #ecf1ff;
    --text-secondary: #bcc9c6;
    --text-muted: #6d7a77;

    --border-light: rgba(255, 255, 255, 0.09);
    --border-medium: rgba(255, 255, 255, 0.16);
    --border-focus: #6bd8cb;

    --accent-primary: #6bd8cb;
    --accent-primary-hover: #85e3d8;
    --accent-glow: rgba(107, 216, 203, 0.28);
    --accent-gradient: linear-gradient(135deg, #6bd8cb 0%, #2dd4bf 100%);
    --accent-destructive: #fd6b36;
    --accent-warning: #e9c46a;
    --accent-playhead: #ffa300;

    --card-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.45);
    --window-shadow: 0 30px 80px -20px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(255, 255, 255, 0.12);
  }
}

/* ==========================================================================
   Base & Reset
   ========================================================================== */

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  line-height: 1.6;
  background-image: 
    radial-gradient(ellipse 75% 45% at 50% -10%, rgba(0, 104, 95, 0.08), transparent 70%),
    radial-gradient(ellipse 60% 35% at 85% 15%, rgba(107, 216, 203, 0.05), transparent 60%);
  background-attachment: fixed;
  overflow-x: hidden;
}

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

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

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-glass);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-light);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.logo-picture,
.footer-logo-picture {
  display: inline-flex;
  align-items: center;
}

.logo-img {
  display: block;
  width: 36px;
  height: 36px;
  border-radius: 9px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}

.nav-actions {
  display: flex;
  align-items: center;
}

.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.icon-sun, .icon-moon {
  width: 18px;
  height: 18px;
}

[data-theme="dark"] .icon-sun {
  display: block;
}
[data-theme="dark"] .icon-moon {
  display: none;
}
[data-theme="light"] .icon-sun {
  display: none;
}
[data-theme="light"] .icon-moon {
  display: block;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun {
    display: block;
  }
  :root:not([data-theme="light"]) .icon-moon {
    display: none;
  }
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .icon-sun {
    display: none;
  }
  :root:not([data-theme="dark"]) .icon-moon {
    display: block;
  }
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero-section {
  padding: 80px 0 60px;
  text-align: center;
}

.eyebrow-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 24px;
  letter-spacing: -0.01em;
  transition: border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.eyebrow-pill:hover {
  border-color: var(--border-focus);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.eyebrow-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-primary);
  box-shadow: 0 0 8px var(--accent-primary);
}

.hero-title {
  font-size: 3.6rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.035em;
  margin-bottom: 24px;
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.hero-line-primary {
  color: var(--text-primary);
}

.hero-line-accent {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  line-height: 1.6;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 36px;
}

.hero-cta-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  margin-bottom: 56px;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  background: var(--accent-gradient);
  color: #ffffff;
  font-size: 1.05rem;
  font-weight: 600;
  box-shadow: 0 4px 20px var(--accent-glow);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

[data-theme="dark"] .btn-primary {
  color: #111c2d;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .btn-primary {
    color: #111c2d;
  }
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px var(--accent-glow);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  font-size: 1.05rem;
  font-weight: 600;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.btn-secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-focus);
  transform: translateY(-1px);
}

.hero-meta {
  font-size: 0.9rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
}

/* ==========================================================================
   App Screenshot Showcase
   ========================================================================== */

.screenshot-showcase {
  margin: 0 auto;
  max-width: 1040px;
  position: relative;
  /* Enhance the authentic macOS drop shadow across light/dark backgrounds */
  filter: drop-shadow(0 20px 45px rgba(17, 28, 45, 0.12));
  transition: filter var(--transition-normal);
}

[data-theme="dark"] .screenshot-showcase {
  filter: drop-shadow(0 25px 60px rgba(0, 0, 0, 0.65));
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .screenshot-showcase {
    filter: drop-shadow(0 25px 60px rgba(0, 0, 0, 0.65));
  }
}

.screenshot-img {
  width: 100%;
}

.screenshot-img img {
  width: 100%;
  height: auto;
  display: block;
  /* The screenshots already include the native macOS window frame & shadow */
}

/* Light / Dark Mode Toggle Display Rules */
.screenshot-dark {
  display: none;
}

.screenshot-light {
  display: block;
}

[data-theme="dark"] .screenshot-dark {
  display: block;
}

[data-theme="dark"] .screenshot-light {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .screenshot-dark {
    display: block;
  }
  :root:not([data-theme="light"]) .screenshot-light {
    display: none;
  }
}

/* ==========================================================================
   Section Styling (Features)
   ========================================================================== */

.section {
  padding: 90px 0;
}

.section-alt {
  background-color: var(--bg-tertiary);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Steps Grid (How It Works) */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 20px;
}

.step-card {
  position: relative;
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.step-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-medium);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--accent-gradient);
  color: #ffffff;
  font-weight: 800;
  font-size: 1.2rem;
  margin-bottom: 24px;
  box-shadow: 0 4px 12px var(--accent-glow);
}

[data-theme="dark"] .step-number {
  color: #111c2d;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .step-number {
    color: #111c2d;
  }
}

.step-heading {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.step-desc {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Features Grid (3 Cards) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.feature-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-4px);
}

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 24px;
}

.feature-title {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin-bottom: 12px;
}

.feature-text {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   Download Banner Section
   ========================================================================== */

.download-banner {
  background: linear-gradient(135deg, rgba(0, 104, 95, 0.07) 0%, rgba(107, 216, 203, 0.07) 100%);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--card-shadow);
}

.banner-title {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.banner-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto 32px;
}

.download-box {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.specs-badge-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.spec-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  padding: 50px 0 35px;
  border-top: 1px solid var(--border-light);
  background: var(--bg-primary);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-logo {
  display: block;
  width: 24px;
  height: 24px;
  border-radius: 6px;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.footer-link {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */

@media (max-width: 960px) {
  .hero-title {
    font-size: 2.7rem;
  }
  .steps-grid, .features-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 2.1rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }
  .btn-primary, .btn-secondary {
    width: 100%;
    justify-content: center;
  }
  .download-banner {
    padding: 40px 20px;
  }
}