/* Matematiğin ABC'si — tanıtım sayfası. Renkler apps/web/app/globals.css ile aynı aileden. */
:root {
  color-scheme: light;
  --bg: #f6f7f3;
  --surface: #fff;
  --soft: #eef2e6;
  --text: #25372f;
  --muted: #5d6b62;
  --line: #e1e7de;
  --brand: #244d3e;
  --brand-hover: #2f5f4c;
  --accent: #c6dd91;
  --cream: #f7f8ef;
  --todo: #fff3b0;
  --todo-line: #e0b400;
  --radius: 18px;
  --serif: Georgia, "Times New Roman", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
h1, h2, h3 { line-height: 1.2; margin: 0; letter-spacing: -.02em; }
h2 { font-family: var(--serif); font-size: clamp(28px, 4vw, 40px); font-weight: 700; margin-bottom: 28px; }
h3 { font-size: 19px; margin-bottom: 8px; }
p { margin: 0; }
:focus-visible { outline: 3px solid #719b59; outline-offset: 3px; border-radius: 6px; }

.kap { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 20px; }

.skip-link { position: fixed; top: -80px; left: 16px; z-index: 100; padding: 12px 18px; background: var(--brand); color: #fff; border-radius: 8px; }
.skip-link:focus { top: 12px; }

/* Taslak işaretleri — yayından önce kaldırılır */
.taslak-serit { background: var(--todo); border-bottom: 2px solid var(--todo-line); text-align: center; font-size: 14px; font-weight: 600; padding: 6px 12px; }
.doldur { background: var(--todo); outline: 2px dashed var(--todo-line); outline-offset: 2px; border-radius: 4px; }

/* Üst şerit */
.ust { position: sticky; top: 0; z-index: 10; background: rgba(246, 247, 243, .92); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.ust-ic { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 68px; }
.marka { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.marka-isaret { display: flex; align-items: center; justify-content: center; width: 44px; height: 44px; border-radius: 12px; background: var(--brand); color: #fff; font-family: var(--serif); font-weight: 700; font-size: 15px; letter-spacing: -.5px; white-space: nowrap; }
.marka-isaret span { color: var(--accent); }
.marka-ad { font-size: 18px; white-space: nowrap; }
.marka-ad strong { color: var(--brand); }
.ust-nav { display: flex; align-items: center; gap: 26px; font-size: 15px; }
.ust-nav a:not(.dugme) { text-decoration: none; color: var(--muted); }
.ust-nav a:not(.dugme):hover { color: var(--brand); }

/* Düğmeler */
.dugme { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 48px; padding: 12px 22px; border-radius: 12px; border: 1px solid transparent; background: var(--brand); color: #fff; font-weight: 600; font-size: 16px; text-decoration: none; transition: background .18s, transform .18s; }
.dugme:hover { background: var(--brand-hover); transform: translateY(-1px); }
.dugme-ikincil { background: var(--surface); color: var(--text); border-color: var(--line); }
.dugme-ikincil:hover { background: var(--soft); }
.dugme-kucuk { min-height: 40px; padding: 8px 16px; font-size: 15px; }
.dugme-buyuk { min-height: 56px; padding: 14px 26px; font-size: 17px; }

/* Kahraman */
.kahraman { padding: 72px 0 80px; }
.kahraman-ic { display: grid; grid-template-columns: 1.25fr 1fr; gap: 56px; align-items: center; }
.ust-baslik { font-size: 13px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: #5e7a4a; margin-bottom: 14px; }
.kahraman h1 { font-family: var(--serif); font-size: clamp(36px, 5.6vw, 58px); font-weight: 700; margin-bottom: 22px; }
.kahraman h1 em { font-style: normal; color: var(--brand); background: linear-gradient(transparent 62%, var(--accent) 62%); padding: 0 4px; }
.giris { font-size: 19px; color: var(--muted); max-width: 560px; margin-bottom: 32px; }
.kahraman-dugmeler { display: flex; flex-wrap: wrap; gap: 12px; }

.kahraman-kart { background: var(--brand); color: var(--cream); border-radius: 28px; padding: 40px 36px; box-shadow: 0 20px 50px rgba(36, 77, 62, .18); }
.abc { display: flex; gap: 10px; margin-bottom: 12px; }
.abc-harf { display: grid; place-items: center; width: 76px; height: 86px; border-radius: 16px; background: rgba(255, 255, 255, .08); border: 1px solid rgba(255, 255, 255, .14); font-family: var(--serif); font-size: 52px; font-weight: 700; }
.abc-vurgu { background: var(--accent); color: var(--brand); border-color: var(--accent); }
.abc-alt { font-size: 15px; opacity: .85; margin-bottom: 26px; }
.abc-alt b { color: var(--accent); }
.abc-liste { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; font-size: 17px; }
.abc-liste li { display: block; }
.abc-liste span { font-family: var(--serif); font-weight: 700; font-size: 22px; color: var(--accent); }

/* Bölümler */
.bolum { padding: 80px 0; }
.bolum-yumusak { background: var(--soft); }
.bolum-koyu { background: var(--brand); color: var(--cream); }
.bolum-koyu .ust-baslik { color: var(--accent); }

.izgara { display: grid; gap: 18px; }
.izgara-siniflar { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.izgara-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.kart { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 24px; }
.kart p { color: var(--muted); font-size: 16px; }
.kart-koyu { background: rgba(255, 255, 255, .06); border-color: rgba(255, 255, 255, .14); }
.kart-koyu p { color: rgba(247, 248, 239, .82); }
.kart-no { display: block; font-family: var(--serif); font-size: 15px; color: var(--accent); margin-bottom: 14px; }

.secenekler { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; margin-top: 36px; }
.secenek { display: flex; gap: 14px; align-items: flex-start; padding: 18px; border-radius: 14px; background: var(--soft); }
.secenek svg { color: var(--brand); margin-top: 2px; }
.secenek strong { display: block; font-size: 16px; }
.secenek span { font-size: 15px; color: var(--muted); }

.adimlar { list-style: none; counter-reset: adim; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.adimlar li { counter-increment: adim; position: relative; padding: 64px 22px 24px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.adimlar li::before { content: counter(adim); position: absolute; top: 20px; left: 22px; display: grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; background: var(--brand); color: #fff; font-weight: 700; font-size: 15px; }
.adimlar strong { display: block; margin-bottom: 6px; }
.adimlar span { color: var(--muted); font-size: 15px; }

.hakkimda { display: grid; grid-template-columns: 300px 1fr; gap: 48px; align-items: center; }
.hakkimda h2 { margin-bottom: 18px; }
.hakkimda p { font-size: 18px; color: var(--muted); max-width: 640px; }
.hakkimda p + p { margin-top: 14px; }
.foto { aspect-ratio: 4 / 5; border-radius: 24px; display: grid; place-items: center; color: #8a7a20; font-weight: 600; }
.rozetler { list-style: none; padding: 0; margin: 22px 0 0; display: flex; flex-wrap: wrap; gap: 10px; }
.rozetler li { padding: 6px 14px; border-radius: 999px; font-size: 15px; background: var(--surface); border: 1px solid var(--line); color: var(--text); }

.iletisim { display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: center; background: var(--surface); border: 1px solid var(--line); border-radius: 28px; padding: 48px; }
.iletisim h2 { margin-bottom: 12px; }
.iletisim p { color: var(--muted); }
.iletisim-dugmeler { display: flex; flex-direction: column; gap: 12px; }

.alt { padding: 32px 0 40px; color: var(--muted); font-size: 14px; }
.alt-ic { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; }

/* Duyarlı düzen */
@media (max-width: 960px) {
  .kahraman-ic { grid-template-columns: 1fr; gap: 40px; }
  .izgara-siniflar { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .secenekler, .adimlar { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .izgara-3 { grid-template-columns: 1fr; }
  .iletisim { grid-template-columns: 1fr; padding: 36px 28px; }
}
@media (max-width: 720px) {
  .ust-nav a:not(.dugme) { display: none; }
  .hakkimda { grid-template-columns: 1fr; gap: 28px; }
  .izgara-siniflar { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .foto { max-width: 260px; }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .kahraman { padding: 44px 0 56px; }
  .bolum { padding: 56px 0; }
  .izgara-siniflar, .secenekler, .adimlar { grid-template-columns: 1fr; }
  .kahraman-dugmeler .dugme, .iletisim-dugmeler .dugme { width: 100%; }
  .kahraman-kart { padding: 30px 22px; }
  .abc-harf { width: 64px; height: 72px; font-size: 42px; }
  .marka-ad { font-size: 16px; }
  .dugme-buyuk { font-size: 15px; padding: 14px 16px; }
}

/* Metin sayfaları (gizlilik politikası) */
.metin { max-width: 760px; }
.metin h1 { font-family: var(--serif); font-size: clamp(32px, 5vw, 46px); margin-bottom: 24px; }
.metin h2 { font-size: clamp(22px, 3vw, 26px); margin: 40px 0 12px; }
.metin p, .metin ul { margin: 0 0 14px; }
.metin li { margin-bottom: 6px; }
.metin a:not(.dugme) { color: var(--brand); }
.metin code { font-size: .9em; background: var(--soft); padding: 1px 6px; border-radius: 6px; }
.alt a { color: var(--muted); }