/* ==========================================================================
   reloDict Landing Page — Styles
   Material 3 Color Palette (#006351)
   ========================================================================== */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Material 3 Light scheme */
  --md-primary: #006351;
  --md-on-primary: #ffffff;
  --md-primary-container: #007e68;
  --md-on-primary-container: #c9ffed;
  --md-secondary: #43655b;
  --md-on-secondary: #ffffff;
  --md-secondary-container: #c5ebdd;
  --md-tertiary: #5d4b90;
  --md-on-tertiary: #ffffff;
  --md-surface: #f6faf7;
  --md-on-surface: #181d1b;
  --md-on-surface-variant: #3e4945;
  --md-outline: #6e7a75;
  --md-outline-variant: #bdc9c4;
  --md-surface-container: #eaefeb;
  --md-surface-container-low: #f0f5f1;
  --md-inverse-surface: #2c312f;
  --md-inverse-primary: #77d8be;
  --md-error: #ba1a1a;

  /* Spacing (multiples of 8) */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  /* Typography */
  --font-body: 'Roboto', system-ui, -apple-system, sans-serif;
  --font-mono: 'Roboto Mono', ui-monospace, monospace;

  /* Borders */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 28px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.2, 0, 0, 1);
  --transition-normal: 300ms cubic-bezier(0.2, 0, 0, 1);

  /* Shadows (Material 3 Elevation) */
  --elevation-1: 0 1px 2px rgba(0, 0, 0, 0.3), 0 1px 3px 1px rgba(0, 0, 0, 0.15);
  --elevation-2: 0 1px 2px rgba(0, 0, 0, 0.3), 0 2px 6px 2px rgba(0, 0, 0, 0.15);
  --elevation-3: 0 4px 8px 3px rgba(0, 0, 0, 0.15), 0 1px 3px rgba(0, 0, 0, 0.3);
}

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

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--md-on-surface);
  background-color: var(--md-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--md-primary-container);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--md-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ---------- Header ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--md-surface);
  border-bottom: 1px solid var(--md-outline-variant);
  backdrop-filter: blur(8px);
  background-color: rgba(246, 250, 247, 0.9);
}

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

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--md-on-surface);
  font-weight: 500;
  font-size: 1.25rem;
}

.header__logo:hover {
  color: var(--md-on-surface);
}

.header__logo-img {
  border-radius: var(--radius-sm);
}

.header__logo-text {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: -0.5px;
}

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

.header__link {
  color: var(--md-on-surface-variant);
  font-size: 0.875rem;
  font-weight: 500;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-xl);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.header__link:hover {
  background-color: var(--md-surface-container);
  color: var(--md-on-surface);
}

/* Language Switch */
.lang-switch {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  border: 1px solid var(--md-outline-variant);
  background: transparent;
  color: var(--md-on-surface-variant);
  padding: 6px 12px;
  border-radius: var(--radius-xl);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
  min-height: 36px;
  min-width: 36px;
}

.lang-switch:hover {
  background-color: var(--md-surface-container);
  border-color: var(--md-outline);
}

.lang-switch__icon {
  flex-shrink: 0;
}

/* ---------- Hero ---------- */
.hero {
  padding: var(--space-4xl) 0 var(--space-3xl);
  background: linear-gradient(
    180deg,
    var(--md-surface) 0%,
    var(--md-surface-container-low) 100%
  );
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.hero__title {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--md-on-surface);
  letter-spacing: -0.5px;
  margin-bottom: var(--space-lg);
}

.hero__subtitle {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--md-on-surface-variant);
  margin-bottom: var(--space-xl);
  max-width: 520px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero__mockup {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero__app-icon {
  border-radius: var(--radius-lg);
  box-shadow: var(--elevation-3);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 12px 24px;
  border-radius: var(--radius-xl);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: background-color var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
  min-height: 48px;
  /* a11y: min tap target */
}

.btn:focus-visible {
  outline: 2px solid var(--md-primary);
  outline-offset: 2px;
}

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

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

.btn--primary:active {
  transform: translateY(0);
  box-shadow: none;
}

.btn--outline {
  background: transparent;
  color: var(--md-primary);
  border: 1px solid var(--md-outline);
}

.btn--outline:hover {
  background-color: var(--md-surface-container);
  border-color: var(--md-primary);
  color: var(--md-primary);
  transform: translateY(-1px);
}

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

.btn--large {
  padding: 16px 32px;
  font-size: 1rem;
}

.btn__icon {
  flex-shrink: 0;
}

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

.features__title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  text-align: center;
  color: var(--md-on-surface);
  margin-bottom: var(--space-3xl);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
}

/* Feature Card */
.feature-card {
  background: var(--md-surface-container-low);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

.feature-card:hover {
  box-shadow: var(--elevation-2);
  transform: translateY(-4px);
}

.feature-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background-color: var(--md-secondary-container);
  color: var(--md-secondary);
  margin-bottom: var(--space-md);
}

.feature-card__title {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--md-on-surface);
  margin-bottom: var(--space-sm);
}

.feature-card__text {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--md-on-surface-variant);
}

/* ---------- CTA Section ---------- */
.cta {
  padding: var(--space-4xl) 0;
  background: linear-gradient(
    135deg,
    var(--md-primary) 0%,
    var(--md-primary-container) 100%
  );
  color: var(--md-on-primary);
}

.cta__inner {
  text-align: center;
}

.cta__title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--md-on-primary);
}

.cta__subtitle {
  font-size: 1.125rem;
  margin-bottom: var(--space-xl);
  opacity: 0.9;
  color: var(--md-on-primary-container);
}

.cta__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
}

.cta .btn--primary {
  background: var(--md-on-primary);
  color: var(--md-primary);
}

.cta .btn--primary:hover {
  background: var(--md-on-primary-container);
  color: var(--md-primary);
  box-shadow: var(--elevation-2);
}

.cta .btn--outline {
  border-color: rgba(255, 255, 255, 0.5);
  color: var(--md-on-primary);
}

.cta .btn--outline:hover {
  background-color: rgba(255, 255, 255, 0.15);
  border-color: var(--md-on-primary);
  color: var(--md-on-primary);
}

/* ---------- Footer ---------- */
.footer {
  padding: var(--space-xl) 0;
  background-color: var(--md-inverse-surface);
  color: rgba(255, 255, 255, 0.7);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer__copy {
  font-size: 0.8125rem;
}

.footer__links {
  display: flex;
  gap: var(--space-md);
}

.footer__link {
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--md-inverse-primary);
}

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

/* Tablet (< 768px) */
@media (max-width: 768px) {
  .hero__inner {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    text-align: center;
  }

  .hero__subtitle {
    max-width: 100%;
  }

  .hero__actions {
    justify-content: center;
  }

  .hero__visual {
    order: -1;
  }

  .hero__app-icon {
    width: 180px;
    height: 180px;
  }

  .hero {
    padding: var(--space-3xl) 0 var(--space-2xl);
  }

  .features {
    padding: var(--space-3xl) 0;
  }

  .features__grid {
    grid-template-columns: 1fr;
  }

  .cta {
    padding: var(--space-3xl) 0;
  }

  .header__link {
    display: none;
  }
}

/* Mobile (< 480px) */
@media (max-width: 480px) {
  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    justify-content: center;
  }

  .cta__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .footer__inner {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }
}

/* Desktop large (> 1200px) */
@media (min-width: 1200px) {
  .container {
    padding: 0 var(--space-xl);
  }
}

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

  html {
    scroll-behavior: auto;
  }
}