/* ============================================
   CommuteMate Landing Page — Shared Styles
   Version: 1.0.0 | Updated: 2026-04-24
   ============================================ */

/* --- Design Tokens --- */
:root {
  /* Colors */
  --color-accent:         #FF6F00;
  --color-accent-light:   #FF8F00;
  --color-accent-dark:    #E65100;
  --color-accent-subtle:  rgba(255, 111, 0, 0.08);
  --color-accent-border:  rgba(255, 111, 0, 0.25);

  --color-bg:             #FAFAFA;
  --color-bg-card:        #FFFFFF;
  --color-bg-subtle:      #F5F5F5;
  --color-bg-nav:         rgba(250, 250, 250, 0.92);

  --color-text:           #1A1A1A;
  --color-text-secondary: #5A5A5A;
  --color-text-muted:     #9A9A9A;
  --color-text-inverse:   #FFFFFF;

  --color-border:         #E8E8E8;
  --color-border-strong:  #D0D0D0;

  --color-surface-hero:   #0F0F0F;
  --color-text-hero:      #F5F5F5;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans KR', 'Apple SD Gothic Neo', sans-serif;

  /* Spacing */
  --space-xs:   4px;
  --space-sm:   8px;
  --space-md:   16px;
  --space-lg:   24px;
  --space-xl:   40px;
  --space-2xl:  64px;
  --space-3xl:  96px;

  /* Layout */
  --container-max:  1100px;
  --container-wide: 1300px;
  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
  --shadow-lg:  0 12px 40px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.05);
  --shadow-accent: 0 4px 20px rgba(255, 111, 0, 0.25);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow:   400ms ease;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg:             #121212;
    --color-bg-card:        #1E1E1E;
    --color-bg-subtle:      #1A1A1A;
    --color-bg-nav:         rgba(18, 18, 18, 0.92);

    --color-text:           #F0F0F0;
    --color-text-secondary: #A8A8A8;
    --color-text-muted:     #666666;

    --color-border:         #2A2A2A;
    --color-border-strong:  #3A3A3A;

    --color-surface-hero:   #0A0A0A;
    --color-text-hero:      #F0F0F0;

    --shadow-sm:  0 1px 3px rgba(0,0,0,0.3);
    --shadow-md:  0 4px 16px rgba(0,0,0,0.3);
    --shadow-lg:  0 12px 40px rgba(0,0,0,0.4);
  }
}

/* --- 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-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

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

/* --- Layout Utilities --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-lg);
  padding-right: var(--space-lg);
}

.container--wide {
  max-width: var(--container-wide);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--color-bg-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
}

.nav__logo img,
.nav__logo svg {
  height: 32px;
  width: auto;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
}

.nav__links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 24px;
  border-radius: var(--radius-full);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  border: none;
  transition:
    background var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    color var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.97);
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: var(--shadow-accent);
}

.btn--primary:hover {
  background: var(--color-accent-light);
  color: #fff;
  box-shadow: 0 6px 28px rgba(255, 111, 0, 0.35);
  transform: translateY(-1px);
}

.btn--outline {
  background: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent-border);
}

.btn--outline:hover {
  background: var(--color-accent-subtle);
  color: var(--color-accent-dark);
  border-color: var(--color-accent);
}

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

.btn--ghost:hover {
  background: var(--color-bg-subtle);
  color: var(--color-text);
}

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

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

.section--sm {
  padding: var(--space-2xl) 0;
}

.section__eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.section__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.section__subtitle {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 560px;
}

/* --- Cards --- */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

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

.card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-accent-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
  font-size: 1.5rem;
}

.card__title {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.card__text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* --- Grid Layouts --- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

/* --- Footer --- */
.footer {
  background: var(--color-surface-hero);
  color: var(--color-text-hero);
  padding: var(--space-2xl) 0 var(--space-xl);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-2xl);
  align-items: start;
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: var(--space-xl);
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.footer__brand p {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.5);
  max-width: 320px;
  line-height: 1.6;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  text-align: right;
}

.footer__links a {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.55);
  transition: color var(--transition-fast);
}

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

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer__copy {
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.35);
}

/* --- Legal Document Styles (privacy.html / terms.html) --- */
.legal-page {
  padding-top: 80px; /* nav height compensation */
}

.legal-header {
  background: var(--color-surface-hero);
  color: var(--color-text-hero);
  padding: var(--space-2xl) 0;
}

.legal-header h1 {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-sm);
}

.legal-header .meta {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.5);
}

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

.legal-content {
  max-width: 760px;
  margin: 0 auto;
}

.legal-content h2 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  margin: var(--space-xl) 0 var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-accent-subtle);
}

.legal-content h2:first-child {
  margin-top: 0;
}

.legal-content h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin: var(--space-lg) 0 var(--space-sm);
}

.legal-content p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: var(--space-md);
}

.legal-content ul,
.legal-content ol {
  margin: var(--space-sm) 0 var(--space-md) var(--space-lg);
}

.legal-content li {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: var(--space-xs);
}

.legal-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-md) 0;
  font-size: 0.875rem;
}

.legal-content th {
  background: var(--color-bg-subtle);
  color: var(--color-text);
  font-weight: 600;
  padding: 10px 14px;
  text-align: left;
  border: 1px solid var(--color-border);
}

.legal-content td {
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  vertical-align: top;
}

.legal-content .highlight-box {
  background: var(--color-accent-subtle);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
}

.legal-content .highlight-box p {
  margin: 0;
  color: var(--color-text);
  font-weight: 500;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  :root {
    --space-3xl: 64px;
    --space-2xl: 48px;
  }

  .grid-3 {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .grid-2 {
    grid-template-columns: 1fr;
  }

  .nav__links {
    display: none;
  }

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

  .footer__links {
    text-align: left;
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-md);
  }

  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .container {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }

  .card {
    padding: var(--space-lg);
  }
}

/* --- Utility Classes --- */
.text-accent { color: var(--color-accent); }
.text-muted  { color: var(--color-text-muted); }
.text-center { text-align: center; }
.mt-sm  { margin-top: var(--space-sm); }
.mt-md  { margin-top: var(--space-md); }
.mt-lg  { margin-top: var(--space-lg); }
.mt-xl  { margin-top: var(--space-xl); }
.flex   { display: flex; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.items-center { align-items: center; }
.flex-wrap { flex-wrap: wrap; }