/* ==========================================================================
   Bíblia + Harpa - Landing Page Styles
   Mobile-first, accessible, performant
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Colors - Semantic tokens */
  --color-primary: #040254;
  --color-primary-light: #1a1a6e;
  --color-accent: #0056D2;
  --color-background: #ffffff;
  --color-surface: #f8fafc;
  --color-text: #1a1a2e;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-xs: 0.75rem;
  --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 weights */
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Line heights */
  --line-height-tight: 1.25;
  --line-height-base: 1.6;
  --line-height-relaxed: 1.75;

  /* Spacing (8px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Border radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

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

  /* Touch targets - minimum 44px */
  --touch-target-min: 2.75rem;
}

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

html {
  font-size: 16px;
  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-base);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  text-decoration: underline;
}

ul, ol {
  list-style: none;
}

/* --------------------------------------------------------------------------
   Accessibility
   -------------------------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: white;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  z-index: 1000;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-4);
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: 75rem;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.header {
  padding: var(--space-4) 0;
  background-color: var(--color-background);
  border-bottom: 1px solid var(--color-border);
}

.header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.header__logo {
  width: 3rem;
  height: 3rem;
  object-fit: contain;
  border-radius: var(--radius-md);
}

.header__name {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  letter-spacing: -0.01em;
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
  padding: var(--space-12) 0 var(--space-16);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: white;
  text-align: center;
}

.hero__title {
  font-size: clamp(var(--font-size-2xl), 5vw, var(--font-size-4xl));
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.hero__subtitle {
  font-size: clamp(var(--font-size-base), 2.5vw, var(--font-size-lg));
  opacity: 0.9;
  max-width: 37.5rem;
  margin: 0 auto var(--space-8);
  line-height: var(--line-height-relaxed);
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-8);
  font-family: var(--font-family);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  min-height: var(--touch-target-min);
}

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

.btn--primary:hover {
  background-color: var(--color-surface);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn--primary:active {
  transform: translateY(0);
}

.btn__icon {
  width: 1.5rem;
  height: 1.5rem;
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Offline Banner
   -------------------------------------------------------------------------- */
.offline-banner {
  padding: var(--space-6) 0;
  background-color: var(--color-primary);
  color: white;
}

.offline-banner__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-4) var(--space-8);
}

.offline-banner__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.offline-banner__icon {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Features Section
   -------------------------------------------------------------------------- */
.features {
  padding: var(--space-16) 0;
  background-color: var(--color-surface);
}

.section-title {
  font-size: clamp(var(--font-size-xl), 4vw, var(--font-size-3xl));
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  text-align: center;
  margin-bottom: var(--space-12);
  letter-spacing: -0.01em;
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15.625rem, 1fr));
  gap: var(--space-6);
}

.feature-card {
  background-color: var(--color-background);
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.feature-card__icon {
  width: 3rem;
  height: 3rem;
  margin-bottom: var(--space-4);
  color: var(--color-accent);
}

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

.feature-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.feature-card__description {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: var(--line-height-relaxed);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  padding: var(--space-8) 0;
  background-color: var(--color-background);
  border-top: 1px solid var(--color-border);
}

.footer__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  text-align: center;
}

.footer__contact {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
}

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

.footer__icon {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
}

.footer__copyright {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Responsive - Mobile First
   -------------------------------------------------------------------------- */

/* Mobile (< 640px) */
@media (max-width: 639px) {
  .hero {
    padding: var(--space-10) 0 var(--space-12);
  }

  .offline-banner__list {
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
  }

  .features {
    padding: var(--space-12) 0;
  }

  .features__grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
}

/* Tablet (640px - 1024px) */
@media (min-width: 640px) and (max-width: 1024px) {
  .features__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Desktop (> 768px) */
@media (min-width: 768px) {
  .footer__content {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* --------------------------------------------------------------------------
   Reduced Motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* --------------------------------------------------------------------------
   Terms Page
   -------------------------------------------------------------------------- */
.terms {
  padding: var(--space-12) 0;
}

.terms__content {
  max-width: 43.75rem;
  margin: 0 auto;
}

.terms h1 {
  font-size: clamp(var(--font-size-2xl), 4vw, var(--font-size-3xl));
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
  letter-spacing: -0.01em;
}

.terms__date {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}

.terms h2 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}

.terms p {
  font-size: var(--font-size-base);
  color: var(--color-text);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-4);
}

.terms ul {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.terms li {
  font-size: var(--font-size-base);
  color: var(--color-text);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-2);
  list-style: disc;
}

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

.terms a:hover {
  text-decoration: underline;
}