/* Design System - CSS Custom Properties */
:root {
  /* Colors */
  --color-primary: #14b8a6;
  --color-primary-hover: #0d9488;
  --color-secondary: #0ea5e9;
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;

  /* Light Mode */
  --color-bg: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-border: #e2e8f0;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Typography */
  --font-family:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu,
    Cantarell, 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;
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md:
    0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg:
    0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl:
    0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;

  /* Layout */
  --header-height: 72px;
  --container-max: 1280px;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #151718;
    --color-bg-secondary: #1e2022;
    --color-text: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-border: #334155;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md:
      0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg:
      0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --shadow-xl:
      0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
  }
}

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

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

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

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

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

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: var(--line-height-tight);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-white:hover {
  background-color: #f8fafc;
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

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

.btn-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.btn-lg .btn-icon {
  width: 24px;
  height: 24px;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding-top: env(safe-area-inset-top, 0px);
  height: calc(var(--header-height) + env(safe-area-inset-top, 0px));
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
}

.logo-text {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-primary);
}

/* Hero Section */
.hero {
  padding-top: calc(var(--header-height) + env(safe-area-inset-top, 0px) + var(--space-3xl));
  padding-bottom: var(--space-3xl);
  background: linear-gradient(
    180deg,
    var(--color-bg-secondary) 0%,
    var(--color-bg) 100%
  );
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2xl);
  text-align: center;
}

.hero-text {
  max-width: 640px;
}

.hero h1 {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-lg);
  text-wrap: balance;
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-secondary) 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-secondary);
  margin-bottom: var(--space-xl);
  text-wrap: balance;
}

.hero-image {
  width: 100%;
  max-width: 360px;
}

.phone-mockup {
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-secondary) 100%
  );
  border-radius: var(--radius-lg);
  padding: 6px;
  box-shadow: var(--shadow-xl);
}

.phone-mockup img {
  border-radius: var(--radius-md);
}

/* Section Titles */
.section-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-sm);
  text-wrap: balance;
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  text-align: center;
  margin-bottom: var(--space-2xl);
  text-wrap: balance;
}

/* Features Section */
.features {
  padding: var(--space-3xl) 0;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.feature-card {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  transition: all var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.feature-icon-primary {
  background-color: rgba(20, 184, 166, 0.15);
  color: var(--color-primary);
}

.feature-icon-secondary {
  background-color: rgba(14, 165, 233, 0.15);
  color: var(--color-secondary);
}

.feature-icon-success {
  background-color: rgba(34, 197, 94, 0.15);
  color: var(--color-success);
}

.feature-icon-warning {
  background-color: rgba(245, 158, 11, 0.15);
  color: var(--color-warning);
}

.feature-icon-danger {
  background-color: rgba(239, 68, 68, 0.15);
  color: var(--color-danger);
}

.feature-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.feature-card p {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* Screenshots Section */
.screenshots {
  padding: var(--space-3xl) 0;
  background-color: var(--color-bg-secondary);
}

.screenshots-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  justify-items: center;
}

.screenshot {
  width: 100%;
  max-width: 240px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* How It Works Section */
.how-it-works {
  padding: var(--space-3xl) 0;
}

.steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.step {
  text-align: center;
}

.step-number {
  width: 56px;
  height: 56px;
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-secondary) 100%
  );
  color: white;
  font-size: var(--font-size-xl);
  font-weight: 700;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-md);
}

.step h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.step p {
  color: var(--color-text-secondary);
  max-width: 320px;
  margin: 0 auto;
}

/* CTA Section */
.cta {
  padding: var(--space-3xl) 0;
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-secondary) 100%
  );
}

.cta-content {
  text-align: center;
  color: white;
}

.cta h2 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-bottom: var(--space-md);
  text-wrap: balance;
}

.cta p {
  font-size: var(--font-size-lg);
  opacity: 0.9;
  margin-bottom: var(--space-xl);
  text-wrap: balance;
}

/* Footer */
.footer {
  padding: var(--space-2xl) 0;
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.footer-logo {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
}

.footer-name {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: #fff;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm) var(--space-xl);
}

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

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

.footer-copyright {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* Legal Pages */
.legal-page {
  padding-top: calc(var(--header-height) + env(safe-area-inset-top, 0px) + var(--space-3xl));
  padding-bottom: var(--space-3xl);
}

.legal-content {
  max-width: 768px;
}

.legal-content h1 {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  margin-bottom: var(--space-sm);
}

.legal-updated {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-2xl);
}

.legal-content h2 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.legal-content p {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-md);
}

.legal-content ul {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-md);
  padding-left: var(--space-xl);
}

.legal-content li {
  margin-bottom: var(--space-xs);
}

.legal-content a {
  color: var(--color-primary);
}

.legal-content a:hover {
  color: var(--color-primary-hover);
}

/* Waitlist Form */
.waitlist-subtitle {
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-xl);
}

.waitlist-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  max-width: 480px;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form-field label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
}

.form-field input {
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast);
}

.form-field input::placeholder {
  color: var(--color-text-secondary);
}

.form-field input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.15);
}

.waitlist-btn {
  align-self: flex-start;
}

/* Waitlist Section (home page) */
.waitlist-section {
  padding: var(--space-3xl) 0;
  background-color: var(--color-bg-secondary);
}

.waitlist-form-centered {
  margin: 0 auto;
}

.hidden {
  display: none;
}

/* Waitlist Thanks */
.waitlist-thanks p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-xl);
}

.waitlist-thanks .btn {
  display: inline-flex;
}

/* Responsive Breakpoints */

/* Small screens (640px+) */
@media (min-width: 640px) {
  .hero h1 {
    font-size: var(--font-size-4xl);
  }

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

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

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

  .step {
    flex: 1;
    max-width: 320px;
  }
}

/* Medium screens (1024px+) */
@media (min-width: 1024px) {
  .hero-content {
    flex-direction: row;
    text-align: left;
    gap: var(--space-3xl);
  }

  .hero-text {
    flex: 1;
  }

  .hero-image {
    flex-shrink: 0;
  }

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

  .section-title {
    font-size: var(--font-size-3xl);
  }

  .cta h2 {
    font-size: var(--font-size-3xl);
  }
}

/* Large screens (1280px+) */
@media (min-width: 1280px) {
  .container {
    padding: 0 var(--space-2xl);
  }

  .hero {
    padding-top: calc(
      var(--header-height) + env(safe-area-inset-top, 0px) + var(--space-3xl) + var(--space-xl)
    );
    padding-bottom: calc(var(--space-3xl) + var(--space-xl));
  }
}