/* ── Variables — Light Theme ────────────────────── */
:root {
  --bg: #ffffff;
  --bg2: #ffffff;
  --bg3: #f8fafc;
  --bg4: #f1f5f9;
  --border: rgba(0, 0, 0, 0.08);
  --border2: rgba(0, 0, 0, 0.14);
  --text: #0f172a;
  --text-mid: #475569;
  --text-dim: #94a3b8;
  --accent: #6366f1;
  --accent2: #4f46e5;
  --green: #059669;
  --cyan: #0891b2;
  --orange: #d97706;
  --red: #dc2626;
  --pink: #db2777;
  --radius: 10px;
  --radius-lg: 16px;
  --trans: 0.2s ease;
  --shadow: 0 2px 16px rgba(0, 0, 0, 0.07);
  --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
  --font-mono: "JetBrains Mono", monospace;
  --font-head: "Ubuntu", sans-serif; /* Başlıklar için Ubuntu */
  --font-body: "Ubuntu", sans-serif; /* Gövde metni için Ubuntu */
  --code-bg: #1e1e2e;
}
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}
a {
  color: inherit;
  text-decoration: none;
}
img {
  max-width: 100%;
  display: block;
}
ul {
  list-style: none;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.06);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-icon {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  background: var(--accent);
  padding: 5px 10px;
  border-radius: 8px;
}
.logo-text {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.5px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
}
.nav-links a {
  padding: 6px 14px;
  border-radius: 7px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-mid);
  transition:
    color var(--trans),
    background var(--trans);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  background: rgba(99, 102, 241, 0.07);
}
.nav-dropdown {
  position: relative;
}
.dropdown-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
}

div.dropdown-menu {
  padding-top: 0;
  margin-top: -9px;
}

.dropdown-toggle .arrow {
  font-size: 10px;
  transition: transform var(--trans);
}
.nav-dropdown:hover .arrow {
  transform: rotate(180deg);
}
.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  background: #fff;
  border: 1px solid var(--border2);
  border-radius: var(--radius-lg);
  padding: 8px;
  min-width: 220px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition:
    opacity var(--trans),
    transform var(--trans);
  box-shadow: var(--shadow-lg);
}
.nav-dropdown:hover .dropdown-menu {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.dropdown-menu a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-mid);

  .dropdown-menu a:hover {
    background: var(--bg2);
    color: var(--text);
  }
}
.dropdown-menu .dropdown-all {
  margin-top: 4px;
  border-top: 1px solid var(--border);
  padding-top: 8px;
  color: var(--accent);
  font-weight: 500;
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}
.nav-cta {
  background: var(--accent);
  color: #fff;
  padding: 8px 18px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  transition:
    background var(--trans),
    transform var(--trans),
    box-shadow var(--trans);
}
.nav-cta:hover {
  background: var(--accent2);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.35);
}
.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-burger span {
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--trans);
}

/* Hero */
.hero {
  padding: 80px 0 72px;
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: -100px;
  right: -100px;
  width: 600px;
  height: 600px;
  background: radial-gradient(
    circle,
    rgba(99, 102, 241, 0.07) 0%,
    transparent 70%
  );
  pointer-events: none;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  position: relative;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.2);
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
  font-family: var(--font-mono);
}
.hero h1 {
  font-family: var(--font-head);
  font-size: clamp(36px, 5vw, 60px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -1px;
  margin-bottom: 20px;
  color: var(--text);
}
.hero h1 .accent {
  color: var(--accent);
}
.hero h1 .green {
  color: var(--green);
}
.hero-desc {
  font-size: 16px;
  color: var(--text-mid);
  line-height: 1.75;
  max-width: 460px;
  margin-bottom: 32px;
}
.hero-btns {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 14px;
  transition:
    background var(--trans),
    transform var(--trans),
    box-shadow var(--trans);
}
.btn-primary:hover {
  background: var(--accent2);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.35);
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  color: var(--text);
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 14px;
  border: 1.5px solid var(--border2);
  transition:
    border-color var(--trans),
    color var(--trans);
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}
.stat-num {
  font-family: var(--font-head);
  font-size: 26px;
  font-weight: 800;
  color: var(--text);
}
.stat-label {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 2px;
}

/* Hero Code */
.hero-code {
  background: var(--code-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.code-topbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}
.code-dots {
  display: flex;
  gap: 6px;
}
.code-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.code-dots span:nth-child(1) {
  background: #ff5f57;
}
.code-dots span:nth-child(2) {
  background: #ffbd2e;
}
.code-dots span:nth-child(3) {
  background: #28ca41;
}
.code-filename {
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
  margin-left: 8px;
}
.code-body {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
  overflow-x: auto;
}
.c-tag {
  color: #f472b6;
}
.c-key {
  color: #c084fc;
}
.c-var {
  color: #67e8f9;
}
.c-str {
  color: #86efac;
}
.c-fn {
  color: #fbbf24;
}
.c-num {
  color: #fb923c;
}
.c-cmt {
  color: #6272a4;
  font-style: italic;
}
.c-op {
  color: #cdd6f4;
}

/* Section */
.section {
  padding: 72px 0;
}
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
  margin-bottom: 10px;
}
.section-label::before {
  content: "//";
  opacity: 0.4;
}
.section-title {
  font-family: var(--font-head);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 800;
  letter-spacing: -0.5px;
  line-height: 1.15;
  margin-bottom: 12px;
  color: var(--text);
}
.section-sub {
  font-size: 15px;
  color: var(--text-mid);
  max-width: 500px;
}

/* Kategori Kartları */
.kat-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
  margin-top: 36px;
}
.kat-card {
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 14px;
  cursor: pointer;
  transition:
    border-color var(--trans),
    transform var(--trans),
    box-shadow var(--trans);
  position: relative;
  overflow: hidden;
  text-align: center;
}
.kat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--kat-color, var(--accent));
  transform: scaleX(0);
  transition: transform 0.3s ease;
  transform-origin: left;
}
.kat-card:hover {
  border-color: var(--kat-color, var(--accent));
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.kat-card:hover::before {
  transform: scaleX(1);
}
.kat-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  margin: 0 auto 12px;
  color: #fff;
  background: var(--kat-color, var(--accent));
  letter-spacing: -0.5px;
}
.kat-ad {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}
.kat-count {
  font-size: 11px;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* Ders Kartları */
.ders-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 36px;
}
.ders-card {
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition:
    border-color var(--trans),
    transform var(--trans),
    box-shadow var(--trans);
  position: relative;
  overflow: hidden;
}
.ders-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--krenk, var(--accent));
  transform: scaleX(0);
  transition: transform 0.3s ease;
  transform-origin: left;
}
.ders-card:hover {
  border-color: var(--krenk, rgba(99, 102, 241, 0.3));
  transform: translateY(-2px);
  box-shadow: 0 4px 24px
    color-mix(in srgb, var(--krenk, #6366f1) 20%, transparent);
}
.ders-card:hover::before {
  transform: scaleX(1);
}
.ders-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.ders-cat-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 3px 10px;
  border-radius: 20px;
  background: rgba(99, 102, 241, 0.08);
  color: var(--accent);
  border: 1px solid rgba(99, 102, 241, 0.15);
}
.ders-seviye {
  font-size: 11px;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 4px;
}
.ders-baslik {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text);
}
.ders-baslik:hover {
  color: var(--krenk, var(--accent));
}
.ders-ozet {
  font-size: 13px;
  color: var(--text-mid);
  line-height: 1.6;
  flex: 1;
}
.ders-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-dim);
  font-family: var(--font-mono);
}
.ders-meta-icons {
  display: flex;
  align-items: center;
  gap: 12px;
}
.ders-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--krenk, var(--accent));
  font-size: 12px;
  font-weight: 600;
  transition: gap var(--trans);
}
.ders-link:hover {
  gap: 10px;
}

/* Tek Ders */
.ders-page {
  padding: 40px 0 80px;
}
.ders-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  align-items: start;
}
.ders-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-dim);
  font-family: var(--font-mono);
  margin-bottom: 20px;
}
.ders-breadcrumb a {
  color: var(--accent);
}
.ders-page-title {
  font-family: var(--font-head);
  font-size: clamp(22px, 4vw, 36px);
  font-weight: 800;
  letter-spacing: -0.5px;
  line-height: 1.2;
  margin-bottom: 16px;
  color: var(--text);
}
.ders-badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-family: var(--font-mono);
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid var(--border2);
  color: var(--text-mid);
  background: var(--bg2);
}
.badge.green {
  border-color: rgba(5, 150, 105, 0.25);
  color: var(--green);
  background: rgba(5, 150, 105, 0.06);
}
.badge.purple {
  border-color: rgba(99, 102, 241, 0.25);
  color: var(--accent);
  background: rgba(99, 102, 241, 0.06);
}
.badge.orange {
  border-color: rgba(217, 119, 6, 0.25);
  color: var(--orange);
  background: rgba(217, 119, 6, 0.06);
}
.video-wrap {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  margin-bottom: 32px;
  border: 1.5px solid var(--border);
  box-shadow: var(--shadow);
}
.video-wrap iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}
.ders-icerik {
  color: var(--text-mid);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 32px;
}
.ders-icerik h2,
.ders-icerik h3 {
  font-family: var(--font-head);
  color: var(--text);
  margin: 28px 0 12px;
}
.ders-icerik p {
  margin-bottom: 16px;
}
.ders-icerik ul {
  padding-left: 20px;
  margin-bottom: 16px;
}
.ders-icerik ul li {
  margin-bottom: 6px;
  list-style: disc;
}
.ders-icerik a {
  color: var(--accent);
}
.ders-icerik strong {
  color: var(--text);
}

/* Kod Blokları */
.kod-blok {
  background: var(--code-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 24px;
  box-shadow: var(--shadow-md);
}
.kod-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}
.kod-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}
.kod-dil {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(99, 102, 241, 0.25);
  color: #a5b4fc;
}
.kod-dil.sql {
  background: rgba(6, 182, 212, 0.25);
  color: #67e8f9;
}
.kod-dil.html {
  background: rgba(227, 76, 38, 0.25);
  color: #fca5a5;
}
.kod-dil.css {
  background: rgba(38, 77, 228, 0.25);
  color: #93c5fd;
}
.kod-dil.js {
  background: rgba(247, 223, 30, 0.2);
  color: #fde68a;
}
.kod-dil.scss {
  background: rgba(205, 103, 153, 0.25);
  color: #f9a8d4;
}
.kod-baslik {
  font-size: 13px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.5);
}
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  padding: 5px 12px;
  cursor: pointer;
  transition:
    color var(--trans),
    border-color var(--trans),
    background var(--trans);
}
.copy-btn:hover {
  color: #a5b4fc;
  border-color: rgba(99, 102, 241, 0.4);
  background: rgba(99, 102, 241, 0.12);
}
.copy-btn.copied {
  color: #6ee7b7;
  border-color: rgba(16, 185, 129, 0.4);
}
.copy-btn svg {
  width: 13px;
  height: 13px;
}
.kod-content {
  padding: 20px;
  overflow-x: auto;
}
.kod-content pre {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
  color: #cdd6f4;
  white-space: pre;
  tab-size: 4;
}
.kod-aciklama {
  padding: 12px 16px;
  background: rgba(99, 102, 241, 0.08);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.45);
  display: flex;
  gap: 8px;
  align-items: flex-start;
}
.kod-aciklama::before {
  content: "i";
  flex-shrink: 0;
  color: #a5b4fc;
  font-style: italic;
  font-family: serif;
}

/* Sidebar */
.sidebar-box {
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
}
.sidebar-box h3 {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}
.sidebar-ders-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.sidebar-ders-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 12px;
  color: var(--text-mid);
  transition:
    background var(--trans),
    color var(--trans);
}
.sidebar-ders-item:hover {
  background: var(--bg2);
  color: var(--text);
}
.sidebar-ders-item.active {
  background: rgba(99, 102, 241, 0.08);
  color: var(--accent);
}
.sidebar-ders-item .num {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-dim);
  width: 20px;
  flex-shrink: 0;
}
.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.sidebar-nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--bg2);
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-mid);
  border: 1px solid var(--border);
  transition:
    border-color var(--trans),
    color var(--trans);
}
.sidebar-nav a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Filter */
.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.filter-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  padding: 7px 16px;
  border-radius: 7px;
  background: var(--bg2);
  border: 1.5px solid var(--border);
  color: var(--text-mid);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--trans);
}
.filter-btn:hover,
.filter-btn.active {
  background: rgba(99, 102, 241, 0.08);
  border-color: rgba(99, 102, 241, 0.3);
  color: var(--accent);
}

/* Page Hero */
.page-hero {
  padding: 52px 0 40px;
  background: #fff;
  border-bottom: 1px solid var(--border);
  margin-bottom: 48px;
}
.page-hero h1 {
  font-family: var(--font-head);
  font-size: clamp(26px, 5vw, 44px);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 10px;
  color: var(--text);
}
.page-hero p {
  color: var(--text-mid);
  font-size: 15px;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-dim);
  font-family: var(--font-mono);
  margin-top: 16px;
}
.breadcrumb a {
  color: var(--accent);
}

/* Admin */
.admin-body {
  background: var(--bg2);
  min-height: 100vh;
}
.admin-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
}
.admin-sidebar {
  background: #fff;
  border-right: 1px solid var(--border);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.admin-sidebar .nav-logo {
  margin-bottom: 24px;
  padding: 0 8px;
}
.admin-nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-mid);
  transition:
    background var(--trans),
    color var(--trans);
}
.admin-nav-item:hover,
.admin-nav-item.active {
  background: rgba(99, 102, 241, 0.08);
  color: var(--accent);
}
.admin-nav-item .icon {
  font-size: 16px;
  width: 20px;
  text-align: center;
}
.admin-main {
  padding: 32px;
}
.admin-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
}
.admin-title {
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 800;
  color: var(--text);
}
.admin-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}
.admin-card h3 {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}
.stat-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow);
}
.stat-card .num {
  font-family: var(--font-head);
  font-size: 30px;
  font-weight: 800;
  color: var(--accent);
}
.stat-card .lbl {
  font-size: 12px;
  color: var(--text-mid);
  margin-top: 4px;
}
.form-group {
  margin-bottom: 18px;
}
.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-mid);
  margin-bottom: 6px;
  font-family: var(--font-mono);
}
.form-control {
  width: 100%;
  background: var(--bg2);
  border: 1.5px solid var(--border2);
  border-radius: var(--radius);
  padding: 10px 14px;
  font-size: 14px;
  color: var(--text);
  font-family: var(--font-body);
  transition: border-color var(--trans);
  outline: none;
}
.form-control:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}
.form-control.mono {
  font-family: var(--font-mono);
  font-size: 13px;
}
textarea.form-control {
  resize: vertical;
  min-height: 120px;
}
.btn-save {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  padding: 10px 22px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition:
    background var(--trans),
    box-shadow var(--trans);
}
.btn-save:hover {
  background: var(--accent2);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}
.btn-danger {
  background: rgba(220, 38, 38, 0.08);
  color: var(--red);
  border: 1px solid rgba(220, 38, 38, 0.2);
  padding: 6px 14px;
  border-radius: 7px;
  font-size: 12px;
  cursor: pointer;
  transition: background var(--trans);
}
.btn-danger:hover {
  background: rgba(220, 38, 38, 0.15);
}
.btn-edit {
  background: rgba(99, 102, 241, 0.08);
  color: var(--accent);
  border: 1px solid rgba(99, 102, 241, 0.2);
  padding: 6px 14px;
  border-radius: 7px;
  font-size: 12px;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--trans);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.btn-edit:hover {
  background: rgba(99, 102, 241, 0.15);
}
.admin-table {
  width: 100%;
  border-collapse: collapse;
}
.admin-table th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.admin-table td {
  padding: 12px;
  font-size: 13px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.admin-table tr:hover td {
  background: var(--bg2);
}
.alert {
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 13px;
  margin-bottom: 16px;
}
.alert-success {
  background: rgba(5, 150, 105, 0.08);
  border: 1px solid rgba(5, 150, 105, 0.25);
  color: var(--green);
}
.alert-error {
  background: rgba(220, 38, 38, 0.08);
  border: 1px solid rgba(220, 38, 38, 0.25);
  color: var(--red);
}
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg2);
}
.login-box {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  width: 100%;
  max-width: 380px;
  box-shadow: var(--shadow-lg);
}
.login-box h2 {
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 6px;
  color: var(--text);
}
.login-box p {
  font-size: 13px;
  color: var(--text-mid);
  margin-bottom: 24px;
}

/* Footer */
.footer {
  background: var(--text);
  border-top: 1px solid var(--border);
  padding: 56px 0 24px;
  margin-top: 80px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 36px;
}
.footer .logo-text {
  color: #fff;
}
.footer-brand p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.45);
  margin: 14px 0;
  line-height: 1.6;
}
.footer-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.footer-tags span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: rgba(255, 255, 255, 0.45);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 3px 10px;
  border-radius: 20px;
}
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: rgba(255, 255, 255, 0.3);
  margin-bottom: 14px;
}
.footer-col a {
  display: block;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.45);
  padding: 4px 0;
  transition: color var(--trans);
}
.footer-col a:hover {
  color: #fff;
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.28);
  font-family: var(--font-mono);
}

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.5s ease,
    transform 0.5s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 1100px) {
  .kat-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}
@media (max-width: 900px) {
  .kat-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .ders-layout {
    grid-template-columns: 1fr;
  }
  .ders-sidebar {
    display: none;
  }
}
@media (max-width: 768px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }
  .hero-code {
    display: none;
  }
  .hero {
    padding: 48px 0 40px;
  }
  .hero h1 {
    font-size: 36px;
    letter-spacing: -0.5px;
  }
  .hero-desc {
    font-size: 15px;
  }
  .hero-stats {
    gap: 20px;
    flex-wrap: wrap;
  }
  .hero-btns {
    flex-direction: column;
    gap: 10px;
  }
  .hero-btns a {
    width: 100%;
    justify-content: center;
    text-align: center;
  }
  .nav-links {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    z-index: 99;
  }
  .nav-links.open {
    display: flex;
  }
  .nav-burger {
    display: flex;
  }
  .nav-actions .nav-cta {
    font-size: 12px;
    padding: 6px 12px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .footer {
    padding: 40px 0 20px;
    margin-top: 48px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .admin-layout {
    grid-template-columns: 1fr;
  }
  .admin-sidebar {
    display: none;
  }
  .kat-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  .kat-card {
    padding: 16px 10px;
  }
  .kat-badge {
    width: 36px;
    height: 36px;
    font-size: 10px;
  }
  .kat-ad {
    font-size: 12px;
  }
  .ders-grid {
    grid-template-columns: 1fr;
  }
  .section {
    padding: 48px 0;
  }
  .page-hero {
    padding: 36px 0 28px;
    margin-bottom: 32px;
  }
  .page-hero h1 {
    font-size: 28px;
  }
  .section-title {
    font-size: 26px;
  }
  .container {
    padding: 0 16px;
  }
  .ders-page {
    padding: 24px 0 48px;
  }
  .ders-page-title {
    font-size: 22px;
  }
  .ders-badges {
    gap: 6px;
  }
  .badge {
    font-size: 10px;
    padding: 3px 8px;
  }
  .kod-content pre {
    font-size: 12px;
  }
  .kod-header {
    flex-wrap: wrap;
    gap: 8px;
  }
  .copy-btn {
    font-size: 10px;
    padding: 4px 8px;
  }
  .preview-btn {
    font-size: 10px;
    padding: 4px 8px;
  }
  .filter-bar {
    gap: 6px;
  }
  .filter-btn {
    font-size: 11px;
    padding: 5px 12px;
  }
  .btn-primary,
  .btn-outline {
    padding: 10px 18px;
    font-size: 13px;
  }
  .sidebar-box {
    padding: 14px;
  }
}

/* Samsung A25 ve küçük ekranlar (360px) */
@media (max-width: 400px) {
  .container {
    padding: 0 12px;
  }
  .hero h1 {
    font-size: 30px;
  }
  .hero-tag {
    font-size: 11px;
    padding: 4px 12px;
  }
  .hero-stats {
    gap: 16px;
  }
  .stat-num {
    font-size: 22px;
  }
  .kat-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }
  .kat-card {
    padding: 14px 8px;
  }
  .kat-badge {
    width: 32px;
    height: 32px;
    font-size: 9px;
    border-radius: 8px;
  }
  .kat-ad {
    font-size: 11px;
  }
  .kat-count {
    font-size: 10px;
  }
  .nav-inner {
    padding: 0 12px;
    gap: 8px;
  }
  .logo-text {
    font-size: 16px;
  }
  .logo-icon {
    font-size: 13px;
    padding: 4px 8px;
  }
  .ders-card {
    padding: 16px;
  }
  .ders-baslik {
    font-size: 14px;
  }
  .page-hero {
    padding: 28px 0 20px;
  }
  .page-hero h1 {
    font-size: 24px;
  }
  .section-title {
    font-size: 22px;
  }
  .footer-grid {
    gap: 20px;
  }
  .kod-blok {
    border-radius: 10px;
  }
  .kod-content {
    padding: 14px;
  }
  .kod-content pre {
    font-size: 11px;
  }
  /* İletişim formu */
  .form-control {
    font-size: 16px;
  } /* iOS zoom engelle */
  /* Hakkımda profil kartı */
  .ders-layout {
    gap: 24px;
  }
}

.preview-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: #86efac;
  background: rgba(134, 239, 172, 0.08);
  border: 1px solid rgba(134, 239, 172, 0.3);
  border-radius: 6px;
  padding: 5px 12px;
  cursor: pointer;
  transition:
    color var(--trans),
    background var(--trans);
}
.preview-btn:hover {
  background: rgba(134, 239, 172, 0.15);
}

/* Hakkımda ve İletişim mobil grid */
@media (max-width: 768px) {
  .hakkimda-grid,
  [style*="grid-template-columns:1fr 300px"],
  [style*="grid-template-columns:1fr 1fr"] {
    grid-template-columns: 1fr !important;
  }
  [style*="grid-template-columns:2fr 1fr"] {
    grid-template-columns: 1fr !important;
  }
  [style*="grid-template-columns:1fr 1fr;gap:64px"] {
    grid-template-columns: 1fr !important;
    gap: 32px !important;
  }
}

/* Mobil tek kolon */
@media (max-width: 768px) {
  .mobil-tek-kolon {
    grid-template-columns: 1fr !important;
    gap: 24px !important;
  }
}
@media (max-width: 768px) {
  .ders-header > p {
    /* İçerik mobilde nefes alsın */
    padding: 12px 16px !important;
    font-size: 14px !important;
    line-height: 1.5 !important;

    /* Uzun kelimelerin veya linklerin taşmasını engeller (Wrap mantığı) */
    word-wrap: break-word !important;
    overflow-wrap: break-word !important;
    white-space: normal !important; /* Metnin yanlamasına uzamasını engeller */

    /* Kenar boşluğunu biraz daraltalım */
    margin-bottom: 16px !important;

    /* Eğer gerekliyse genişliği tam yapalım */
    width: auto !important;
    display: block !important;
  }
}
@media (max-width: 768px) {
  .ders-icerik {
    /* Arka planı sıfırlayalım veya sayfa yapına uygun hale getirelim */
    background-color: transparent;

    /* Mobilde ekran dar olduğu için yan boşlukları optimize ediyoruz */
    padding-left: 15px !important;
    padding-right: 15px !important;
    padding-top: 10px !important;

    /* İçerikteki görsellerin veya tabloların dışarı taşmasını engeller */
    width: 100% !important;
    box-sizing: border-box !important;
    overflow-x: hidden; /* Yatay kaydırma çubuğunu öldürür */

    /* Metinlerin okunabilirliğini artırır */
    font-size: 16px !important;
    line-height: 1.6 !important;
  }

  /* Bonus: İçerik içindeki resimlerin taşmasını engellemek için */
  .ders-icerik img {
    max-width: 100% !important;
    height: auto !important;
  }
}
@media (max-width: 768px) {
  /* Kodun dış kapsayıcısı (div veya pre ise) */
  .kod-blok {
    display: block !important;
    width: 100% !important;
    max-width: 100vw !important; /* Ekran genişliğini asla geçme der */
    overflow-x: auto !important; /* Yatay kaydırmayı zorunlu kılar */
    background: #282c34 !important; /* Arka plan belirgin olsun */
    padding: 15px !important;
    box-sizing: border-box !important;
    position: relative !important;
  }

  /* Kodun kendisi (genelde içindeki <code> etiketi) */
  .kod-blok code {
    display: inline-block !important; /* Kaydırma için bu kritik */
    white-space: pre !important; /* Kod düzenini bozma */
    word-break: normal !important; /* Kelimeleri yarıda kesme */
    font-size: 13px !important;
    font-family: monospace !important;
  }
}