/* Tokenlar cove/notes/01-Tasarim-Sistemi.md ile birebir eşleşir. */
:root {
  --ice-blue: #E3F2FD;
  --pure-white: #FFFFFF;
  --deep-navy: #263238;

  --radius-card: 24px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;

  --text-title: rgba(38, 50, 56, 0.92);
  --text-body: rgba(38, 50, 56, 0.82);
  --text-caption: rgba(38, 50, 56, 0.56);

  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-weight: 300;
  color: var(--text-body);
  background: var(--ice-blue);
  -webkit-font-smoothing: antialiased;
  padding: 0 var(--space-md);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

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

/* Seviye 1 — Zemin (CoveBackdrop): gradient + bulanık renk lekeleri */
.backdrop {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background: linear-gradient(160deg, #EEF7FE 0%, var(--ice-blue) 45%, #D6EAF8 100%);
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.55;
}

.blob-1 { width: 420px; height: 420px; top: -120px; left: -100px; background: #B3D9F7; }
.blob-2 { width: 360px; height: 360px; top: 38%; right: -120px; background: #C9E4F6; }
.blob-3 { width: 300px; height: 300px; bottom: -80px; left: 20%; background: #A9CBE0; opacity: 0.35; }

/* Glass seviyeleri */
.glass {
  border-radius: var(--radius-card);
  border: 1px solid rgba(255, 255, 255, 0.6);
}

/* Seviye 2 — Kart */
.glass-card {
  background: rgba(255, 255, 255, 0.42);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

/* Seviye 3 — Floating / nav */
.glass-floating {
  background: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.10);
}

/* Tipografi */
.wordmark {
  font-weight: 200;
  font-size: 22px;
  letter-spacing: 0.32em;
  color: var(--deep-navy);
}

.wordmark-small { font-size: 16px; }

.display {
  margin: 0;
  font-weight: 200;
  font-size: clamp(38px, 7vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--deep-navy);
}

.eyebrow {
  margin: 0 0 var(--space-md);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-caption);
}

.lead {
  max-width: 560px;
  margin: var(--space-lg) auto 0;
  font-size: 18px;
  line-height: 1.6;
  color: var(--text-body);
}

.section-title {
  margin: 0 0 var(--space-lg);
  font-weight: 300;
  font-size: 28px;
  letter-spacing: 0.01em;
  color: var(--deep-navy);
}

.card-title,
.principle-title {
  display: block;
  margin: 0 0 var(--space-sm);
  font-weight: 400;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--text-title);
}

.body {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-body);
}

.caption {
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-caption);
}

/* Nav */
.nav {
  position: sticky;
  top: calc(var(--space-md) + env(safe-area-inset-top, 0px));
  z-index: 10;
  max-width: 1040px;
  margin: var(--space-md) auto 0;
  padding: var(--space-md) var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
  font-size: 14px;
  font-weight: 400;
  color: var(--text-body);
}

.nav-links a:hover { color: var(--deep-navy); }

/* Hero */
.hero {
  max-width: 1040px;
  margin: 0 auto;
  padding: clamp(64px, 12vw, 128px) 0 var(--space-xl);
  text-align: center;
}

.hero-actions {
  margin-top: var(--space-xl);
  display: flex;
  justify-content: center;
}

.pill {
  display: inline-block;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 500;
  color: var(--deep-navy);
}

.tagline {
  margin: var(--space-lg) 0 0;
  font-size: 14px;
  font-style: italic;
  color: var(--text-caption);
}

/* Bölümler */
.section {
  max-width: 1040px;
  margin: 0 auto;
  padding: var(--space-xl) 0;
}

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

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

.icon-badge {
  width: 40px;
  height: 40px;
  margin-bottom: var(--space-md);
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--ice-blue);
}

.icon-badge svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: var(--deep-navy);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

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

.principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-lg);
}

/* Footer */
.footer {
  max-width: 1040px;
  margin: 0 auto;
  padding: var(--space-xl) 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

@media (max-width: 480px) {
  .nav { padding: 12px var(--space-md); }
  .nav-links { gap: var(--space-md); }
  .lead { font-size: 16px; }
  .philosophy { padding: var(--space-lg) var(--space-md); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}