/* ============================================
   Rıdvan Özata — Kişisel Site
   Tasarım dili: Sophisticated Dark (violet → fuchsia)
   ============================================ */

:root {
  color-scheme: dark;
  --bg: #0a0a0a;
  --surface: rgba(24, 24, 27, 0.5);          /* zinc-900/50 */
  --surface-solid: #18181b;
  --border: rgba(255, 255, 255, 0.05);
  --border-strong: rgba(255, 255, 255, 0.1);
  --text: #f4f4f5;                            /* zinc-100 */
  --text-muted: #a1a1aa;                      /* zinc-400 */
  --text-faint: #71717a;                      /* zinc-500 */
  --prose-text: #d4d4d8;
  --overlay-1: rgba(255, 255, 255, 0.05);
  --overlay-2: rgba(255, 255, 255, 0.1);
  --overlay-3: rgba(255, 255, 255, 0.07);
  --header-bg: rgba(10, 10, 10, 0.8);
  --mobile-nav-bg: rgba(10, 10, 10, 0.95);
  --scrollbar-thumb: #27272a;
  --scrollbar-thumb-hover: #3f3f46;
  --note-text: #fcd34d;
  --violet: #8b5cf6;
  --violet-strong: #7c3aed;
  --violet-soft: rgba(139, 92, 246, 0.4);
  --fuchsia: #d946ef;
  --fuchsia-strong: #c026d3;
  --blue: #60a5fa;
  --emerald: #10b981;
  --amber: #f59e0b;
  --gradient: linear-gradient(to right, var(--violet), var(--fuchsia));
  --font-sans: 'Inter', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;
  --radius: 16px;
  --radius-sm: 12px;
}

/* ---------- Light theme ---------- */
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #fafafa;
  --surface: rgba(255, 255, 255, 0.7);
  --surface-solid: #f4f4f5;
  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.14);
  --text: #18181b;                            /* zinc-900 */
  --text-muted: #52525b;                      /* zinc-600 */
  --text-faint: #71717a;                      /* zinc-500 */
  --prose-text: #3f3f46;
  --overlay-1: rgba(0, 0, 0, 0.04);
  --overlay-2: rgba(0, 0, 0, 0.08);
  --overlay-3: rgba(0, 0, 0, 0.06);
  --header-bg: rgba(250, 250, 250, 0.8);
  --mobile-nav-bg: rgba(250, 250, 250, 0.95);
  --scrollbar-thumb: #d4d4d8;
  --scrollbar-thumb-hover: #a1a1aa;
  --note-text: #92400e;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    color-scheme: light;
    --bg: #fafafa;
    --surface: rgba(255, 255, 255, 0.7);
    --surface-solid: #f4f4f5;
    --border: rgba(0, 0, 0, 0.08);
    --border-strong: rgba(0, 0, 0, 0.14);
    --text: #18181b;
    --text-muted: #52525b;
    --text-faint: #71717a;
    --prose-text: #3f3f46;
    --overlay-1: rgba(0, 0, 0, 0.04);
    --overlay-2: rgba(0, 0, 0, 0.08);
    --overlay-3: rgba(0, 0, 0, 0.06);
    --header-bg: rgba(250, 250, 250, 0.8);
    --mobile-nav-bg: rgba(250, 250, 250, 0.95);
    --scrollbar-thumb: #d4d4d8;
    --scrollbar-thumb-hover: #a1a1aa;
    --note-text: #92400e;
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.2s ease, color 0.2s ease;
}

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-thumb-hover); }
html { scrollbar-color: var(--scrollbar-thumb) var(--bg); }

a { color: inherit; }
img { max-width: 100%; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
@media (min-width: 768px) {
  .container { padding: 0 48px; }
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  width: 100%;
  border-bottom: 1px solid var(--border);
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
@media (min-width: 768px) {
  .header-inner { padding: 0 48px; }
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.brand-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  transition: transform 0.2s;
}
.brand:hover .brand-icon { transform: scale(1.05); }
.brand-icon img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.brand-icon .logo-for-dark-theme { display: none; }
[data-theme="dark"] .brand-icon .logo-for-light-theme { display: none; }
[data-theme="dark"] .brand-icon .logo-for-dark-theme { display: block; }
.brand-name {
  display: block;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}
.brand-tag {
  display: block;
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.main-nav {
  display: none;
  align-items: center;
  gap: 6px;
}
@media (min-width: 900px) {
  .main-nav { display: flex; }
}
.main-nav a {
  border-radius: 9999px;
  padding: 6px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: all 0.2s;
}
.main-nav a:hover { background: var(--overlay-1); color: var(--text); }
.main-nav a.active {
  background: var(--text);
  color: var(--bg);
  box-shadow: 0 4px 6px var(--overlay-1);
}

.header-cta {
  display: none;
  align-items: center;
  gap: 6px;
  border-radius: 9999px;
  background: var(--gradient);
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  text-decoration: none;
  box-shadow: 0 10px 15px -3px rgba(124, 58, 237, 0.15);
  transition: all 0.2s;
}
.header-cta:hover { opacity: 0.95; transform: scale(1.02); }
@media (min-width: 900px) {
  .header-cta { display: inline-flex; }
}

.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 18px;
}
.menu-toggle:hover { background: var(--overlay-1); color: var(--text); }
@media (min-width: 900px) {
  .menu-toggle { display: none; }
}

.mobile-nav {
  display: none;
  flex-direction: column;
  gap: 6px;
  border-top: 1px solid var(--border);
  background: var(--mobile-nav-bg);
  backdrop-filter: blur(16px);
  padding: 16px 24px;
}
.mobile-nav.open { display: flex; }
@media (min-width: 900px) {
  .mobile-nav.open { display: none; }
}
.mobile-nav a {
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
}
.mobile-nav a:hover { background: var(--overlay-1); color: var(--text); }
.mobile-nav a.active { background: var(--text); color: var(--bg); }

.theme-toggle {
  display: none;
  align-items: center;
  gap: 6px;
  border-radius: 9999px;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  padding: 7px 14px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  transition: all 0.2s;
}
.theme-toggle:hover { background: var(--overlay-1); color: var(--text); }
.theme-toggle .theme-toggle-icon { font-size: 15px; line-height: 1; }
@media (min-width: 900px) {
  .header-inner .theme-toggle { display: flex; }
}
.mobile-nav .theme-toggle {
  display: flex;
  width: 100%;
  justify-content: center;
  margin-top: 4px;
}
@media (min-width: 900px) {
  .mobile-nav .theme-toggle { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 80px 0 96px;
  text-align: center;
}
.hero::before,
.hero::after {
  content: '';
  position: absolute;
  width: 384px;
  height: 384px;
  border-radius: 50%;
  filter: blur(128px);
  pointer-events: none;
}
.hero::before { top: 25%; left: -48px; background: rgba(124, 58, 237, 0.1); }
.hero::after { bottom: 25%; right: -48px; background: rgba(192, 38, 211, 0.1); }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 9999px;
  background: var(--overlay-1);
  border: 1px solid var(--border-strong);
  padding: 6px 16px;
  font-size: 12px;
  font-weight: 600;
  color: var(--violet);
  margin-bottom: 24px;
}
.hero-badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--emerald);
  animation: pulse 2s infinite;
}
.hero-badge-cta {
  background: var(--gradient);
  border: none;
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  padding: 10px 22px;
  box-shadow: 0 10px 25px -5px rgba(139, 92, 246, 0.4);
  transition: all 0.2s;
}
.hero-badge-cta .dot { background: #fff; }
.hero-badge-cta:hover { opacity: 0.92; transform: scale(1.02); }
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  max-width: 900px;
  margin: 0 auto;
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
}
.gradient-text {
  background: linear-gradient(to right, #a78bfa, #e879f9, var(--fuchsia));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.lead {
  max-width: 640px;
  margin: 24px auto 0;
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-muted);
  line-height: 1.7;
}
.hero-actions {
  margin-top: 40px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 12px;
  padding: 14px 32px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}
.btn-primary {
  background: var(--violet-strong);
  color: #fff;
  box-shadow: 0 20px 25px -5px rgba(124, 58, 237, 0.25);
}
.btn-primary:hover { background: var(--violet); transform: scale(1.02); }
.btn-ghost {
  border: 1px solid var(--border-strong);
  background: var(--overlay-1);
  color: var(--prose-text);
  backdrop-filter: blur(4px);
}
.btn-ghost:hover { background: var(--overlay-2); color: var(--text); transform: scale(1.02); }

/* ---------- Sections ---------- */
.section { padding: 64px 0 96px; }
.section-head { margin-bottom: 48px; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.section-head h2 {
  margin-top: 8px;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}
.head-bar {
  margin-top: 10px;
  height: 4px;
  width: 48px;
  border-radius: 2px;
  background: var(--gradient);
}
.section-head p.sub {
  margin-top: 16px;
  max-width: 640px;
  color: var(--text-muted);
}

/* ---------- Cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
@media (min-width: 700px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .card-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
  .card-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 24px;
  text-decoration: none;
  transition: all 0.25s;
}
.card:hover {
  transform: translateY(-6px);
  border-color: var(--violet-soft);
  box-shadow: 0 20px 25px -5px rgba(46, 16, 101, 0.2);
}
.card.accent-fuchsia:hover { border-color: rgba(217, 70, 239, 0.4); }
.card.accent-blue:hover { border-color: rgba(96, 165, 250, 0.4); }
.card.accent-emerald:hover { border-color: rgba(16, 185, 129, 0.4); }

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  font-size: 18px;
  background: rgba(76, 29, 149, 0.4);
  border: 1px solid transparent;
  color: #a78bfa;
}
.accent-fuchsia .card-icon { background: rgba(112, 26, 117, 0.4); color: #e879f9; }
.accent-blue .card-icon { background: rgba(23, 37, 84, 0.4); color: var(--blue); }
.accent-emerald .card-icon { background: rgba(6, 78, 59, 0.4); color: #34d399; }

/* Aydınlık modda koyu-saydam rozet zemini soluklaşıp ikonu görünmez kıldığı için
   pastel ton + renkli kenarlığa geçilir */
:root[data-theme="light"] .card-icon { background: rgba(139, 92, 246, 0.12); border-color: rgba(139, 92, 246, 0.3); }
:root[data-theme="light"] .accent-fuchsia .card-icon { background: rgba(217, 70, 239, 0.12); border-color: rgba(217, 70, 239, 0.3); }
:root[data-theme="light"] .accent-blue .card-icon { background: rgba(96, 165, 250, 0.12); border-color: rgba(96, 165, 250, 0.3); }
:root[data-theme="light"] .accent-emerald .card-icon { background: rgba(16, 185, 129, 0.12); border-color: rgba(16, 185, 129, 0.3); }

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) .card-icon { background: rgba(139, 92, 246, 0.12); border-color: rgba(139, 92, 246, 0.3); }
  :root:not([data-theme]) .accent-fuchsia .card-icon { background: rgba(217, 70, 239, 0.12); border-color: rgba(217, 70, 239, 0.3); }
  :root:not([data-theme]) .accent-blue .card-icon { background: rgba(96, 165, 250, 0.12); border-color: rgba(96, 165, 250, 0.3); }
  :root:not([data-theme]) .accent-emerald .card-icon { background: rgba(16, 185, 129, 0.12); border-color: rgba(16, 185, 129, 0.3); }
}
.card-index {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-faint);
}
.card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  transition: color 0.2s;
}
.card:hover h3 { color: #a78bfa; }
.accent-fuchsia:hover h3 { color: #e879f9; }
.accent-blue:hover h3 { color: var(--blue); }
.accent-emerald:hover h3 { color: #34d399; }
.card p {
  margin-top: 8px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
}
.card-link {
  margin-top: 16px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-faint);
}
.card:hover .card-link { color: var(--text); }

/* Pills / tags */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  border-radius: 9999px;
  background: var(--overlay-1);
  border: 1px solid var(--border);
  padding: 3px 10px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
}
.pill.mono {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ---------- Article / prose ---------- */
.prose {
  max-width: 760px;
  margin: 0 auto;
}
.prose h2 {
  margin: 40px 0 16px;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}
.prose h3 {
  margin: 32px 0 12px;
  font-size: 1.15rem;
  font-weight: 700;
}
.prose p { margin: 0 0 18px; color: var(--prose-text); }
.prose ul, .prose ol { margin: 0 0 18px 22px; color: var(--prose-text); }
.prose li { margin-bottom: 8px; }
.prose a { color: #a78bfa; text-decoration: none; border-bottom: 1px solid rgba(167, 139, 250, 0.3); }
.prose a:hover { color: #c4b5fd; border-color: rgba(167, 139, 250, 0.6); }
.prose code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--overlay-3);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 7px;
  color: #e879f9;
}
.prose blockquote {
  margin: 24px 0;
  border-left: 3px solid var(--violet);
  padding: 12px 20px;
  background: var(--surface);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-muted);
  font-style: italic;
}
.prose strong { color: var(--text); }

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 16px 0 32px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-faint);
}

/* Info / warning notes */
.note {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(245, 158, 11, 0.25);
  background: rgba(245, 158, 11, 0.06);
  padding: 14px 18px;
  font-size: 13.5px;
  color: var(--note-text);
  line-height: 1.6;
}
.note .note-icon { flex-shrink: 0; font-size: 16px; }

/* ---------- Cert list ---------- */
.cert-list {
  display: grid;
  gap: 16px;
}
.cert-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 20px 24px;
  text-decoration: none;
  transition: all 0.2s;
}
.cert-item:hover {
  border-color: var(--violet-soft);
  transform: translateX(4px);
}
.cert-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(76, 29, 149, 0.4);
  border: 1px solid transparent;
  font-size: 20px;
}
/* Aydınlık modda koyu-saydam rozet zemini soluklaşıp ikonu görünmez kıldığı için
   pastel ton + renkli kenarlığa geçilir */
:root[data-theme="light"] .cert-badge { background: rgba(139, 92, 246, 0.12); border-color: rgba(139, 92, 246, 0.3); }
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) .cert-badge { background: rgba(139, 92, 246, 0.12); border-color: rgba(139, 92, 246, 0.3); }
}
.cert-item h3 { font-size: 15.5px; font-weight: 700; }
.cert-item .issuer {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #a78bfa;
  margin-top: 2px;
}
.cert-item p { font-size: 13.5px; color: var(--text-muted); margin-top: 6px; }
.cert-item .verify {
  margin-left: auto;
  flex-shrink: 0;
  align-self: center;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-faint);
}
.cert-item:hover .verify { color: var(--text); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 48px 0 40px;
  margin-top: 32px;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.footer-brand .brand-icon { width: 34px; height: 34px; }
.footer-brand .brand-name { font-size: 15px; }
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}
.footer-nav a {
  font-size: 13.5px;
  color: var(--text-muted);
  text-decoration: none;
}
.footer-nav a:hover { color: var(--text); }
.footer-copy {
  font-size: 12.5px;
  color: var(--text-faint);
}
.footer-copy a { color: var(--text-muted); text-decoration: none; }
.footer-copy a:hover { color: var(--text); }

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-faint);
  margin-bottom: 24px;
}
.breadcrumb a { color: var(--text-muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--text); }

.breadcrumb .sep { opacity: 0.5; }