/* DTYK herkese açık site — modern kurumsal tasarım */

:root {
  --navy: #0f2a4a;
  --navy-2: #16385f;
  --navy-3: #1e4a7c;
  --accent: #2f80c3;
  --accent-soft: #e3eef8;
  --gold: #c9a227;
  --gold-soft: #f7efd8;
  --bg: #f7f9fc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #1c2733;
  --text-soft: #5a6b7d;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(15, 42, 74, .08), 0 8px 30px rgba(15, 42, 74, .07);
  --shadow-lg: 0 4px 12px rgba(15, 42, 74, .12), 0 16px 48px rgba(15, 42, 74, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
h1, h2, h3 { color: var(--navy); line-height: 1.25; margin: 0 0 .6rem; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 1.25rem; }

/* ---------- üst bar ---------- */
.site-head {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.site-head.on-hero {
  background: rgba(15, 42, 74, .55);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, .12);
}
.head-inner { display: flex; align-items: center; gap: 1rem; min-height: 66px; position: relative; }

.logo { display: flex; align-items: center; gap: .65rem; }
.logo-mark {
  width: 42px; height: 42px; border-radius: 12px; flex: none;
  background: linear-gradient(135deg, var(--navy) 20%, var(--navy-3));
  color: var(--gold); font-weight: 800; font-size: 1.05rem; letter-spacing: .02em;
  display: inline-flex; align-items: center; justify-content: center;
  box-shadow: inset 0 0 0 1.5px rgba(201, 162, 39, .55);
}
.logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.logo-text strong { color: var(--navy); font-size: 1.05rem; letter-spacing: .04em; }
.logo-text small { color: var(--text-soft); font-size: .68rem; max-width: 260px; }
.on-hero .logo-text strong { color: #fff; }
.on-hero .logo-text small { color: rgba(255, 255, 255, .75); }

.site-nav { margin-left: auto; display: flex; align-items: center; gap: .35rem; }
.site-nav a {
  padding: .5rem .85rem; border-radius: 9px; color: var(--text); font-weight: 600; font-size: .93rem;
}
.site-nav a:hover { background: var(--accent-soft); }
.site-nav a.active { color: var(--navy-3); background: var(--accent-soft); }
.on-hero .site-nav a { color: rgba(255, 255, 255, .88); }
.on-hero .site-nav a:hover, .on-hero .site-nav a.active { background: rgba(255, 255, 255, .14); color: #fff; }

.btn-member, .site-nav a.btn-member {
  background: var(--gold); color: var(--navy) !important; font-weight: 700;
  box-shadow: var(--shadow);
}
.btn-member:hover { filter: brightness(1.06); background: var(--gold) !important; }

.nav-toggle-box { display: none; }
.nav-toggle { display: none; margin-left: auto; font-size: 1.3rem; cursor: pointer;
  color: var(--navy); border: 1px solid var(--border); border-radius: 9px; padding: .25rem .6rem; }
.on-hero .nav-toggle { color: #fff; border-color: rgba(255, 255, 255, .35); }

@media (max-width: 800px) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none; position: absolute; top: 66px; left: 0; right: 0;
    background: #fff; flex-direction: column; align-items: stretch;
    padding: .75rem 1.25rem 1.1rem; gap: .3rem;
    border-bottom: 1px solid var(--border); box-shadow: var(--shadow-lg);
  }
  .site-nav a { color: var(--text) !important; }
  .nav-toggle-box:checked ~ .site-nav { display: flex; }
  .logo-text small { display: none; }
}

/* ---------- hero ---------- */
.hero {
  margin-top: -66px; /* sticky header'ın altına uzan */
  padding-top: 66px;
  background:
    radial-gradient(1000px 500px at 85% -10%, rgba(47, 128, 195, .35), transparent 60%),
    radial-gradient(700px 400px at -10% 110%, rgba(201, 162, 39, .18), transparent 55%),
    linear-gradient(150deg, #0b2036 0%, var(--navy) 45%, var(--navy-3) 100%);
  color: #fff;
}
.hero-inner { padding: 5.5rem 1.25rem 6rem; max-width: 820px; margin: 0; }
.hero-kicker {
  display: inline-block; font-size: .78rem; font-weight: 700; letter-spacing: .14em;
  text-transform: uppercase; color: var(--gold);
  border: 1px solid rgba(201, 162, 39, .45); border-radius: 999px; padding: .3rem .85rem;
  margin: 0 0 1.2rem;
}
.hero h1 {
  color: #fff; font-size: clamp(1.9rem, 4.2vw, 3rem); font-weight: 800;
  letter-spacing: -.01em; margin-bottom: 1rem;
}
.hero h1 em { font-style: normal; color: var(--gold); }
.hero-sub { color: rgba(255, 255, 255, .82); font-size: 1.08rem; max-width: 640px; margin: 0 0 2rem; }
.hero-cta { display: flex; gap: .8rem; flex-wrap: wrap; }

.btn-gold, .btn-line, .btn-line-dark {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .7rem 1.4rem; border-radius: 11px; font-weight: 700; font-size: .95rem;
  transition: transform .15s, filter .15s;
}
.btn-gold { background: var(--gold); color: var(--navy); box-shadow: var(--shadow-lg); }
.btn-gold:hover { filter: brightness(1.07); transform: translateY(-1px); }
.btn-line { border: 1.5px solid rgba(255, 255, 255, .45); color: #fff; }
.btn-line:hover { background: rgba(255, 255, 255, .1); transform: translateY(-1px); }
.btn-line-dark { border: 1.5px solid var(--navy-3); color: var(--navy-3); }
.btn-line-dark:hover { background: var(--accent-soft); }

/* ---------- bölümler ---------- */
.section { padding: 4rem 0; }
.section-alt { background: #eef3f9; }
.section-title { font-size: clamp(1.4rem, 2.6vw, 1.9rem); font-weight: 800; letter-spacing: -.01em; }
.section-sub { color: var(--text-soft); margin: 0 0 2rem; max-width: 640px; }
.section-head-row { display: flex; align-items: flex-end; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }

/* odak kartları */
.focus-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem; }
.focus-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.5rem 1.4rem; box-shadow: var(--shadow); transition: transform .18s, box-shadow .18s;
  border-top: 3px solid transparent;
}
.focus-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-top-color: var(--gold); }
.focus-ico { font-size: 1.9rem; display: block; margin-bottom: .6rem; }
.focus-card h3 { font-size: 1.05rem; }
.focus-card p { margin: 0; color: var(--text-soft); font-size: .92rem; }

/* yazı kartları */
.post-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem; }
.post-card {
  display: flex; flex-direction: column; gap: .5rem;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.4rem; box-shadow: var(--shadow); color: var(--text);
  transition: transform .18s, box-shadow .18s;
}
.post-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.post-card h3 { font-size: 1.08rem; margin: 0; }
.post-card p { margin: 0; color: var(--text-soft); font-size: .9rem; flex: 1; }
.post-meta { display: flex; align-items: center; gap: .6rem; font-size: .8rem; color: var(--text-soft); flex-wrap: wrap; }
.post-meta.on-dark { color: rgba(255, 255, 255, .8); }
.post-date { white-space: nowrap; }
.post-more { color: var(--accent); font-weight: 700; font-size: .88rem; }

.chip {
  background: var(--accent-soft); color: var(--navy-3);
  padding: .18rem .65rem; border-radius: 999px; font-size: .74rem; font-weight: 700;
}
.chip-gold { background: var(--gold-soft); color: #7a5f0e; }

.filter-row { display: flex; gap: .5rem; flex-wrap: wrap; margin-bottom: 1.75rem; }
.chip-filter {
  border: 1.5px solid var(--border); border-radius: 999px; padding: .35rem .95rem;
  color: var(--text-soft); font-weight: 600; font-size: .86rem; background: #fff;
}
.chip-filter:hover { border-color: var(--accent); color: var(--navy-3); }
.chip-filter.active { background: var(--navy-2); border-color: var(--navy-2); color: #fff; }

/* üyeler */
.member-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: .9rem; }
.member-card {
  display: flex; align-items: center; gap: .8rem;
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: .85rem 1rem; box-shadow: var(--shadow);
}
.member-card strong { display: block; font-size: .95rem; color: var(--navy); }
.member-card small { color: var(--text-soft); font-size: .78rem; }
.avatar {
  width: 44px; height: 44px; border-radius: 50%; flex: none;
  background: linear-gradient(135deg, var(--navy-2), var(--navy-3));
  color: var(--gold); font-weight: 700; font-size: .92rem;
  display: inline-flex; align-items: center; justify-content: center;
}

/* TDUB bandı */
.tdub-band {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-3) 100%);
  color: #fff; padding: 3.5rem 0;
}
.tdub-band-inner { display: flex; align-items: center; gap: 2rem; justify-content: space-between; flex-wrap: wrap; }
.tdub-band h2 { color: #fff; font-size: 1.35rem; }
.tdub-band p { color: rgba(255, 255, 255, .8); max-width: 680px; margin: 0; font-size: .95rem; }

/* iç sayfa hero */
.page-hero {
  background: linear-gradient(150deg, #0b2036 0%, var(--navy) 55%, var(--navy-3) 100%);
  color: #fff; padding: 3.2rem 0 3.4rem;
}
.page-hero h1 { color: #fff; font-size: clamp(1.6rem, 3.4vw, 2.4rem); font-weight: 800; }
.page-hero p { color: rgba(255, 255, 255, .8); margin: 0; }
.article-title { max-width: 820px; }

/* yazı içeriği */
.prose-wrap { max-width: 780px; }
.prose { font-size: 1.03rem; }
.prose h2 { margin-top: 2.2rem; font-size: 1.35rem; padding-bottom: .35rem; border-bottom: 2px solid var(--gold-soft); }
.prose h3 { margin-top: 1.6rem; font-size: 1.1rem; }
.prose p { margin: 0 0 1.1rem; }
.prose ul, .prose ol { padding-left: 1.4rem; margin: 0 0 1.1rem; }
.prose li { margin-bottom: .4rem; }
.prose blockquote {
  margin: 1.4rem 0; padding: .8rem 1.2rem; border-left: 4px solid var(--gold);
  background: var(--gold-soft); border-radius: 0 10px 10px 0; color: #5c4a10;
}
.prose strong { color: var(--navy); }
.article-foot { margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid var(--border); }

.prose-wrap h2 { font-size: 1.35rem; margin-top: 2rem; }
.prose-wrap ul { padding-left: 1.3rem; }
.prose-wrap li { margin-bottom: .5rem; }

.muted-note { color: var(--text-soft); font-size: .88rem; margin-top: 1.5rem; }

/* ---------- alt bilgi ---------- */
.site-foot { background: #0b1c30; color: rgba(255, 255, 255, .75); margin-top: 0; }
.foot-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 1.5rem;
  padding-top: 2.4rem; padding-bottom: 1.6rem; flex-wrap: wrap;
}
.foot-brand { display: flex; align-items: center; gap: .8rem; font-size: .92rem; }
.foot-brand strong { color: #fff; }
.foot-brand small { color: rgba(255, 255, 255, .55); }
.foot-nav { display: flex; gap: 1.2rem; flex-wrap: wrap; }
.foot-nav a { color: rgba(255, 255, 255, .8); font-size: .9rem; }
.foot-nav a:hover { color: var(--gold); }
.foot-note {
  border-top: 1px solid rgba(255, 255, 255, .1);
  padding-top: 1.1rem; padding-bottom: 1.6rem; font-size: .78rem; color: rgba(255, 255, 255, .45);
}

/* ---------- duyarlılık ---------- */
@media (max-width: 960px) {
  .focus-grid, .post-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .focus-grid, .post-grid { grid-template-columns: 1fr; }
  .hero-inner { padding: 4rem 1.25rem 4.5rem; }
  .section { padding: 2.75rem 0; }
  .tdub-band-inner { flex-direction: column; align-items: flex-start; }
}