/* ========================================
   Strata Landing Page - Styles
   ======================================== */

/* CSS Variables */
:root {
  --color-bg: #0a0a0a;
  --color-surface: #111111;
  --color-surface-hover: #1a1a1a;
  --color-border: #222222;
  --color-text: #ffffff;
  --color-text-muted: #a0a0a0;
  --color-text-subtle: #888888;
  --color-accent: #00b4ff;
  --color-accent-hover: #00c8ff;
  --color-accent-glow: rgba(0, 180, 255, 0.3);
  --color-red: #ff4444;
  --color-blue: #0088ff;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;

  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  --max-width: 1400px;
  --nav-height: 72px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-accent);
  text-decoration: underline;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-hover);
}

/* Remove underlines from navigation, button, and footer links */
a.nav-link,
a.nav-logo,
a.btn,
.footer-links a {
  text-decoration: none;
}

/* Add underline on hover for links that don't have it by default */
.footer-links a:hover {
  text-decoration: underline;
}

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

/* Container */
.container {
  width: 100%;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

/* ========================================
   Navigation
   ======================================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
}

.nav-container {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

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

.nav-logo img {
  height: 32px;
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xl);
}

.nav-link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

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

.nav-cta {
  justify-self: end;
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-sm);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: var(--color-text);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--color-accent-glow);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-base);
}

.btn-icon {
  width: 18px;
  height: 18px;
}

.btn-download {
  width: 100%;
  margin-top: auto;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  min-height: 100vh;
  padding-top: calc(var(--nav-height) + var(--spacing-4xl));
  padding-bottom: var(--spacing-4xl);
  display: flex;
  align-items: center;
}

.hero-container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.hero-content {
  text-align: center;
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.02em;
}

.hero-title-accent {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  max-width: 700px;
  margin: 0 auto var(--spacing-xl);
}

.hero-cta {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  align-items: center;
  justify-content: center;
}

.hero-image {
  display: flex;
  justify-content: center;
}

.hero-image-wrapper {
  position: relative;
  max-width: 1100px;
  width: 100%;
}

.hero-screenshot {
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  border: 1px solid var(--color-border);
}

.hero-image-glow {
  position: absolute;
  inset: -20%;
  background: radial-gradient(ellipse at center, var(--color-accent-glow) 0%, transparent 70%);
  z-index: -1;
  opacity: 0.5;
}

/* ========================================
   Section Styles
   ======================================== */
.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--spacing-3xl);
}

/* ========================================
   Features Section
   ======================================== */
.features {
  padding: var(--spacing-4xl) 0;
  background: var(--color-surface);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: var(--spacing-2xl);
  max-width: 1200px;
  margin: 0 auto;
}

.feature-card {
  padding: var(--spacing-xl);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.feature-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.feature-icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--spacing-md);
  color: var(--color-accent);
}

.feature-icon svg {
  width: 100%;
  height: 100%;
}

.feature-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.feature-desc {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* ========================================
   Downloads Section
   ======================================== */
.downloads {
  padding: var(--spacing-4xl) 0;
}

.download-cards {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: var(--spacing-2xl);
  max-width: 900px;
  margin: 0 auto var(--spacing-3xl);
}

.download-card {
  display: flex;
  flex-direction: column;
  padding: var(--spacing-xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all var(--transition-base);
}

.download-card:hover {
  border-color: var(--color-text-muted);
  background: var(--color-surface-hover);
}

.download-card-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--spacing-md);
  color: var(--color-text);
}

.download-card-icon svg {
  width: 100%;
  height: 100%;
}

.download-card-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.download-card-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xs);
}

.download-card-req {
  font-size: var(--font-size-sm);
  color: var(--color-text-subtle);
  margin-bottom: var(--spacing-lg);
}

/* Requirements Note */
.requirements-note {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.requirements-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--color-accent);
}

/* ========================================
   Footer
   ======================================== */
.footer {
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.footer-brand img {
  height: 24px;
  opacity: 0.6;
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-links a {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.footer-bottom p {
  font-size: var(--font-size-sm);
  color: var(--color-text-subtle);
}

/* ========================================
   Responsive Breakpoints
   ======================================== */

/* Mobile styles (default, then override for larger) */
@media (max-width: 767px) {
  :root {
    --nav-height: 60px;
  }

  .nav-container {
    display: flex;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
  }

  .nav-logo img {
    height: 26px;
  }

  .nav-links {
    gap: var(--spacing-md);
  }

  .nav-link {
    font-size: 0.8125rem;
  }

  .nav-spacer {
    display: none;
  }

  .hero {
    padding-top: calc(var(--nav-height) + var(--spacing-2xl));
    padding-bottom: var(--spacing-2xl);
  }

  .hero-container {
    padding: 0 var(--spacing-md);
    gap: var(--spacing-2xl);
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-subtitle {
    font-size: var(--font-size-base);
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  .section-title {
    font-size: var(--font-size-2xl);
  }

  .section-subtitle {
    font-size: var(--font-size-base);
  }

  .features,
  .downloads {
    padding: var(--spacing-2xl) 0;
  }

  .footer {
    padding: var(--spacing-xl) 0 var(--spacing-md);
  }
}

/* Tablet and up */
@media (min-width: 768px) {
  .hero-title {
    font-size: var(--font-size-5xl);
  }

  .hero-cta {
    flex-direction: row;
    justify-content: center;
  }

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

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

  .footer-content {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* Desktop */
@media (min-width: 1024px) {
  .hero-image-wrapper {
    max-width: 1200px;
  }
}

/* Large Desktop */
@media (min-width: 1280px) {
  :root {
    --font-size-5xl: 4rem;
  }

  .container,
  .nav-container,
  .hero-container {
    padding: 0 var(--spacing-3xl);
  }
}

/* Extra Large Desktop */
@media (min-width: 1600px) {
  .container,
  .nav-container,
  .hero-container {
    padding: 0 var(--spacing-4xl);
  }
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-content {
  animation: fadeInUp 0.6s ease-out;
}

.hero-image {
  animation: fadeInUp 0.6s ease-out 0.2s backwards;
}

.feature-card {
  animation: fadeInUp 0.6s ease-out backwards;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }

.download-card {
  animation: fadeInUp 0.6s ease-out backwards;
}

.download-card:nth-child(1) { animation-delay: 0.1s; }
.download-card:nth-child(2) { animation-delay: 0.2s; }

/* ========================================
   Mobile Notice for Desktop-Only App
   ======================================== */
.btn.mobile-notice {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  cursor: default;
}

.btn.mobile-notice:hover {
  transform: none;
  box-shadow: none;
}

/* Footer Disclaimer */
.footer-disclaimer {
  font-size: 0.75rem;
  color: var(--color-text-subtle);
  margin-top: 0.5rem;
}

/* ========================================
   Download Agreement (Terms Checkbox)
   ======================================== */
.download-agreement {
  max-width: 900px;
  margin: 0 auto var(--spacing-2xl);
  text-align: center;
}

.agreement-label {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.agreement-label:hover {
  border-color: var(--color-accent);
  background: var(--color-surface-hover);
}

.agreement-label.highlight-pulse {
  animation: pulse-highlight 0.5s ease-in-out 3;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-glow);
}

@keyframes pulse-highlight {
  0%, 100% {
    box-shadow: 0 0 0 4px var(--color-accent-glow);
  }
  50% {
    box-shadow: 0 0 0 8px var(--color-accent-glow), 0 0 20px var(--color-accent);
  }
}

.agreement-label input[type="checkbox"] {
  display: none;
}

.agreement-checkmark {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  border: 2px solid var(--color-text-subtle);
  border-radius: 4px;
  position: relative;
  transition: all var(--transition-fast);
}

.agreement-label input[type="checkbox"]:checked + .agreement-checkmark {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.agreement-label input[type="checkbox"]:checked + .agreement-checkmark::after {
  content: '';
  position: absolute;
  left: 5px;
  top: 1px;
  width: 6px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.agreement-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.agreement-text a {
  color: var(--color-accent);
}

.agreement-text a:hover {
  color: var(--color-accent-hover);
}

/* Disabled download buttons */
.download-cards.downloads-disabled .btn-download {
  opacity: 0.4;
  cursor: not-allowed;
}

.download-cards.downloads-disabled .btn-download:hover {
  transform: none;
  box-shadow: none;
}

/* Mobile responsive */
@media (max-width: 767px) {
  .agreement-label {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .agreement-text {
    font-size: 0.8125rem;
    text-align: left;
  }
}

/* ========================================
   Legal Pages (Terms, Privacy)
   ======================================== */
.legal-page {
  padding: 6rem 0 4rem;
  min-height: calc(100vh - 200px);
}

.legal-page .container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.legal-page h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.legal-updated {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-bottom: 2rem;
}

.legal-page h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.legal-page h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.legal-page p {
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.legal-page ul {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.legal-page li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.legal-page strong {
  color: var(--color-text);
}

.legal-page a {
  color: var(--color-accent);
}

.legal-page a:hover {
  color: var(--color-accent-hover);
}