/* =============================================================
   Kısaca Elektronik - Genel Site Stili
   Tasarım dili: koyu tema, amber vurgu rengi (mockup ile uyumlu)
   ============================================================= */

:root {
  --bg: #12141A;
  --bg-alt: #0F1116;
  --card: #1A1D25;
  --border: #22252E;
  --border-soft: #2B2F3A;
  --text: #E7E9EE;
  --text-strong: #F8F9FB;
  --text-muted: #868B99;
  --text-dim: #B9BDC9;
  --accent: #F2A93B;
  --accent-hover: #F7C36B;
  --accent-dark: #13151A;
  --teal: #4FD1C5;
  --green: #7FD78C;
  --radius: 16px;
  --radius-sm: 10px;
  --max-width: 1312px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  margin: 0;
  color: var(--text-strong);
}

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

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ---------- Header ---------- */
.site-header {
  width: 100%;
  box-sizing: border-box;
  padding: 20px 64px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(18, 20, 26, 0.92);
  backdrop-filter: blur(8px);
  z-index: 10;
}

.logo { display: flex; align-items: center; gap: 12px; }
.logo-badge {
  width: 40px; height: 40px; border-radius: 10px;
  background: #1C1F26; border: 1px solid var(--border-soft);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.logo-text { font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 20px; color: var(--text-strong); }

.main-nav { display: flex; align-items: center; gap: 36px; flex-wrap: wrap; }
.nav-link { color: var(--text-dim); font-weight: 600; font-size: 15px; }
.nav-link:hover { color: var(--accent); }
.nav-link.active { color: var(--accent); border-bottom: 2px solid var(--accent); padding-bottom: 4px; }

.btn-youtube {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent); color: var(--accent-dark);
  font-weight: 700; font-size: 14px; padding: 10px 18px; border-radius: 999px;
  border: none; cursor: pointer;
}
.btn-youtube:hover { color: var(--accent-dark); background: var(--accent-hover); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-weight: 700; font-size: 15px; padding: 14px 28px; border-radius: var(--radius-sm);
  border: none; cursor: pointer; font-family: 'Inter', sans-serif;
}
.btn-primary { background: var(--accent); color: var(--accent-dark); }
.btn-primary:hover { background: var(--accent-hover); color: var(--accent-dark); }
.btn-secondary { background: transparent; color: var(--text); border: 1px solid var(--border-soft); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Cards ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.topic-card { display: flex; flex-direction: column; gap: 14px; }
.topic-card .topic-cat {
  display: inline-flex; align-self: flex-start; font-size: 12px; font-weight: 700;
  color: var(--accent); background: rgba(242,169,59,0.12); padding: 4px 10px; border-radius: 999px;
}
.topic-card h3 { font-size: 18px; }
.topic-card p { color: var(--text-muted); font-size: 14px; margin: 0; line-height: 1.5; }
.topic-card .topic-link { font-weight: 600; font-size: 14px; display: inline-flex; align-items: center; gap: 6px; }

.topics-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}
@media (max-width: 1100px) { .topics-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 640px) { .topics-grid { grid-template-columns: 1fr; } }

/* ---------- Forms ---------- */
.field { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.field label { font-size: 13px; font-weight: 600; color: var(--text-dim); }
.field input, .field textarea, .field select {
  background: var(--bg); border: 1px solid var(--border-soft); border-radius: var(--radius-sm);
  padding: 12px 14px; color: var(--text); font-size: 14px; font-family: 'Inter', sans-serif; outline: none;
  width: 100%;
}
.field input:focus, .field textarea:focus, .field select:focus { border-color: var(--accent); }

.alert { padding: 14px 18px; border-radius: var(--radius-sm); font-size: 14px; margin-bottom: 20px; }
.alert-success { background: rgba(127,215,140,0.12); color: var(--green); border: 1px solid rgba(127,215,140,0.3); }
.alert-error { background: rgba(230,90,90,0.12); color: #E65A5A; border: 1px solid rgba(230,90,90,0.3); }

/* ---------- Footer ---------- */
.site-footer {
  width: 100%; box-sizing: border-box; padding: 48px 64px; border-top: 1px solid var(--border);
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px;
  background: var(--bg-alt);
}

/* ---------- Sections ---------- */
.page-header { padding: 72px 64px 16px; text-align: center; }
.page-header h1 { font-size: 40px; font-weight: 700; margin-bottom: 8px; }
.page-header p { font-size: 16px; color: var(--text-muted); margin: 0; }
.section { padding: 48px 64px; }

@media (max-width: 768px) {
  .site-header, .page-header, .section, .site-footer { padding-left: 20px; padding-right: 20px; }
}