/* aipim.org — styles
 * follows brand guide second edition · april 2026
 * palette: grey ramp only · typography: satoshi · all text lowercase
 */

@import url('https://api.fontshare.com/v2/css?f[]=satoshi@300,400,500,700&display=swap');

:root {
  /* brand */
  --aipim-graphite: #1A1A1A;
  --aipim-cream:    #FAFAFA;
  /* grey ramp */
  --aipim-black: #000000;
  --aipim-ink:   #333333;
  --aipim-slate: #666666;
  --aipim-mute:  #888888;
  --aipim-line:  #D0D0D0;
  --aipim-fog:   #EBEBEB;
  --aipim-white: #FFFFFF;
  /* thaipim colour — appears only on the thaipim card */
  --thaipim-petroleum: #3C6C84;
  /* typography */
  --aipim-font: 'Satoshi', 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* reset */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; padding: 0; }
button { font: inherit; cursor: pointer; background: none; border: none; color: inherit; padding: 0; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; height: auto; }

/* base */
body {
  background: var(--aipim-cream);
  color: var(--aipim-graphite);
  font-family: var(--aipim-font);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* selection */
::selection { background: var(--aipim-graphite); color: var(--aipim-cream); }

/* utility — everything lowercase per brand guide */
.lowercase { text-transform: lowercase; }

/* layout container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 28px;
}
@media (min-width: 768px) {
  .container { padding: 0 48px; }
}

/* ============ header ============ */
.site-header {
  padding: 24px 0;
  border-bottom: 0.5px solid var(--aipim-fog);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.wordmark-link {
  display: flex;
  align-items: center;
}
.wordmark-link img { height: 34px; width: auto; }
@media (min-width: 768px) {
  .wordmark-link img { height: 38px; }
}

/* language toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--aipim-mute);
}
.lang-toggle a { color: var(--aipim-graphite); transition: color 120ms ease; }
.lang-toggle a:hover { color: var(--aipim-slate); }
.lang-toggle .current { color: var(--aipim-mute); pointer-events: none; }
.lang-toggle .sep { color: var(--aipim-line); }

/* ============ hero ============ */
.hero {
  padding: 72px 0 88px;
}
@media (min-width: 900px) {
  .hero { padding: 112px 0 120px; }
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 56px;
  align-items: center;
}
@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1.1fr 1fr;
    gap: 72px;
  }
}
.hero-headline {
  font-size: 32px;
  line-height: 1.12;
  font-weight: 500;
  letter-spacing: -0.018em;
  margin: 0 0 40px;
  max-width: 520px;
}
@media (min-width: 600px) { .hero-headline { font-size: 38px; } }
@media (min-width: 900px) { .hero-headline { font-size: 46px; margin-bottom: 48px; } }
@media (min-width: 1200px) { .hero-headline { font-size: 52px; } }

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.btn {
  display: inline-block;
  padding: 12px 20px;
  font-size: 13px;
  line-height: 1;
  border-radius: 2px;
  border: 0.5px solid var(--aipim-line);
  color: var(--aipim-ink);
  background: transparent;
  transition: border-color 160ms ease, color 160ms ease, background 160ms ease;
}
.btn:hover { border-color: var(--aipim-graphite); color: var(--aipim-graphite); }
.btn--primary {
  border-color: var(--aipim-graphite);
  color: var(--aipim-graphite);
}
.btn--primary:hover {
  background: var(--aipim-graphite);
  color: var(--aipim-cream);
}
.btn--dark {
  background: var(--aipim-graphite);
  color: var(--aipim-cream);
  border-color: var(--aipim-graphite);
}
.btn--dark:hover { background: #000; border-color: #000; }

/* ============ app cards (hero right) ============ */
.app-cards {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.app-card {
  padding: 28px 24px;
  border-radius: 4px;
  min-height: 180px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 180ms ease;
}
.app-card:hover { transform: translateY(-2px); }
.app-card__kicker {
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.app-card__name {
  font-size: 28px;
  font-weight: 400;
  margin-top: 16px;
  letter-spacing: -0.005em;
}
.app-card__sub {
  font-size: 13px;
  line-height: 1.55;
  margin-top: 28px;
}
.app-card--thaipim {
  background: var(--thaipim-petroleum);
  color: var(--aipim-cream);
}
.app-card--thaipim .app-card__kicker { color: var(--aipim-cream); opacity: 0.65; }
.app-card--thaipim .app-card__sub    { color: var(--aipim-cream); opacity: 0.88; }
.app-card--mapim {
  background: var(--aipim-fog);
  color: var(--aipim-graphite);
}
.app-card--mapim .app-card__kicker { color: var(--aipim-mute); }
.app-card--mapim .app-card__sub    { color: var(--aipim-slate); }

/* ============ principle section ============ */
.principle {
  padding: 104px 0 112px;
  text-align: center;
  border-top: 0.5px solid var(--aipim-fog);
}
.kicker {
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--aipim-mute);
  margin: 0 0 32px;
}
.principle__line {
  font-size: 28px;
  line-height: 1.25;
  font-weight: 400;
  letter-spacing: -0.015em;
  max-width: 560px;
  margin: 0 auto;
}
.principle__line .muted { color: var(--aipim-slate); }
@media (min-width: 768px)  { .principle__line { font-size: 34px; } }
@media (min-width: 1100px) { .principle__line { font-size: 40px; } }

/* ============ applications detail section ============ */
.applications {
  padding: 88px 0 96px;
  background: #F4F4F4;
  border-top: 0.5px solid var(--aipim-fog);
  border-bottom: 0.5px solid var(--aipim-fog);
}
.applications .kicker { text-align: center; }
.app-detail-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
@media (min-width: 768px) {
  .app-detail-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
.app-detail {
  padding: 32px 28px;
  background: var(--aipim-cream);
  border-radius: 4px;
}
.app-detail__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-bottom: 22px;
}
.app-detail__dot--thaipim { background: var(--thaipim-petroleum); }
.app-detail__dot--mapim   { background: var(--aipim-mute); }
.app-detail__name {
  font-size: 24px;
  font-weight: 400;
  margin: 0 0 6px;
  letter-spacing: -0.005em;
}
.app-detail__kicker {
  font-size: 11px;
  color: var(--aipim-mute);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 0 0 18px;
}
.app-detail__desc {
  font-size: 14px;
  color: var(--aipim-ink);
  line-height: 1.65;
  margin: 0;
}

/* ============ tiers section ============ */
.tiers {
  padding: 104px 0 88px;
  text-align: center;
}
.tiers__title {
  font-size: 24px;
  font-weight: 400;
  letter-spacing: -0.01em;
  max-width: 520px;
  margin: 0 auto 48px;
  line-height: 1.3;
}
@media (min-width: 768px) { .tiers__title { font-size: 28px; } }
.tiers-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  max-width: 960px;
  margin: 0 auto;
}
@media (min-width: 768px) {
  .tiers-grid { grid-template-columns: 1fr 1fr 1fr; gap: 20px; }
}
.tier-card {
  padding: 32px 28px;
  border: 0.5px solid var(--aipim-line);
  border-radius: 4px;
  text-align: left;
  background: var(--aipim-cream);
}
.tier-card__num {
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--aipim-mute);
  margin: 0 0 16px;
}
.tier-card__name {
  font-size: 18px;
  font-weight: 500;
  margin: 0 0 14px;
  letter-spacing: -0.005em;
}
.tier-card__desc {
  font-size: 13px;
  color: var(--aipim-slate);
  line-height: 1.65;
  margin: 0;
}

/* ============ support CTA section ============ */
.support {
  padding: 24px 0 112px;
  text-align: center;
}

/* ============ footer ============ */
.site-footer {
  padding: 28px 0;
  border-top: 0.5px solid var(--aipim-fog);
  font-size: 11px;
  color: var(--aipim-mute);
  letter-spacing: 0.05em;
}
.site-footer .container {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  text-align: center;
}
@media (min-width: 768px) {
  .site-footer .container {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
    gap: 24px;
  }
}
.footer__quote {
  font-style: italic;
  color: var(--aipim-slate);
  max-width: 520px;
}

/* accessibility */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* focus ring — accessibility */
a:focus-visible, button:focus-visible, .btn:focus-visible {
  outline: 1.5px solid var(--aipim-graphite);
  outline-offset: 3px;
}

/* reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  html { scroll-behavior: auto; }
}