/* ==================================================================
   Çağan Alp Er — Portfolyo
   ================================================================== */

/* Temel Sıfırlama */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-h); -webkit-text-size-adjust: 100%; }
body { overflow-x: hidden; overflow-x: clip; } /* Mobilde taşmaları önlemek için */
img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
ul { list-style: none; }
input, textarea { font: inherit; color: inherit; }

/* Renk Paleti ve Değişkenler (Mor & Siyah Modern Tema) */
:root {
  --bg-main: #0a0a0c;
  --bg-alt: #0f0e14;
  --card-bg: #15141b;
  --card-hover: #1b1924;
  --text-main: #f6f5fa;
  --text-soft: #c8c5d4;
  --text-muted: #9a97ad;

  /* Referans görseldeki canlı mor gradient renkleri */
  --accent-light: #9d4edd;
  --accent-dark: #6d28d9;
  --accent-bright: #b77ef0;
  --accent-pale: #e0c3fc;
  --accent-glow: rgba(157, 78, 221, 0.4);
  --accent-soft: rgba(157, 78, 221, 0.14);
  --accent-line: rgba(157, 78, 221, 0.3);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --border-hover: rgba(157, 78, 221, 0.45);

  --font-display: 'IBM Plex Serif', Georgia, serif;
  --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  --radius: 18px;
  --radius-sm: 12px;
  --nav-h: 88px;
  --container: 1140px;
  --gutter: 32px;
  --section-space: clamp(88px, 11vw, 140px);
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --transition: 0.3s var(--ease);
}

/* Genel Yapı */
body {
  font-family: var(--font-body);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
  z-index: 1;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
p { text-wrap: pretty; }

/* Işık Efektleri (Glow) */
.glow-text {
  text-shadow: 0 0 24px rgba(157, 78, 221, 0.14);
}

::selection { background: var(--accent-light); color: #fff; }
:focus-visible { outline: 2px solid var(--accent-bright); outline-offset: 3px; }

/* KAYDIRMA ÇUBUĞU */
html { scrollbar-color: #2c2738 var(--bg-main); }
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-main); }
::-webkit-scrollbar-thumb { background: #2c2738; border: 2px solid var(--bg-main); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: #3d3550; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); }

.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--accent-light); color: #fff;
  padding: 12px 20px; z-index: 999;
  border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* İsimdeki mor geçişli yazı */
.accent-text {
  color: var(--accent-light);
  font-style: italic;
  white-space: nowrap;
  padding-right: 0.08em;
  background: linear-gradient(100deg, var(--accent-pale) 0%, var(--accent-bright) 35%, var(--accent-light) 65%, var(--accent-dark) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: none;
}

/* Bölüm etiketi (hap şeklinde) */
.section-tag {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 0.72rem;
  letter-spacing: 0.16em; color: var(--text-soft); text-transform: uppercase;
  padding: 7px 16px 7px 12px; margin-bottom: 22px;
  border: 1px solid var(--border-color); border-radius: 999px;
  background: rgba(255, 255, 255, 0.025);
}
.section-tag::before {
  content: ''; width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent-light);
  box-shadow: 0 0 0 3px var(--accent-soft), 0 0 10px var(--accent-glow);
}

.cursor {
  display: inline-block; width: 7px; height: 1.1em;
  margin-left: -4px; background: var(--accent-light);
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* Atmosfer / Arka Plan (Donanım dostu) */
.bg-glow {
  position: fixed; inset: 0;
  z-index: -1; pointer-events: none;
  background:
    radial-gradient(ellipse 70% 45% at 50% -10%, rgba(157, 78, 221, 0.16), transparent 70%),
    radial-gradient(circle at 15% 30%, rgba(157, 78, 221, 0.06) 0%, transparent 40%),
    radial-gradient(circle at 85% 70%, rgba(109, 40, 217, 0.05) 0%, transparent 40%);
}

/* Yan Kaydırma Göstergesi (Desktop) */
.side-panel {
  position: fixed; left: 32px; top: 50%;
  transform: translateY(-50%); z-index: 90;
  display: flex; flex-direction: column; align-items: center; gap: 16px;
}
.side-label {
  font-family: var(--font-mono); font-size: 0.7rem;
  color: var(--text-muted); writing-mode: vertical-rl;
  transform: rotate(180deg); letter-spacing: 0.2em;
}
.side-track {
  width: 2px; height: 100px; background: var(--border-color);
  border-radius: 2px; position: relative; overflow: hidden;
}
.side-track-fill {
  position: absolute; inset: 0;
  background: linear-gradient(to bottom, var(--accent-light), var(--accent-dark));
  transform: scaleY(0); transform-origin: top;
  transition: transform 0.15s linear;
}
.side-dots { display: flex; flex-direction: column; gap: 2px; margin: 4px 0; }
.side-dot {
  position: relative; width: 20px; height: 20px;
  display: grid; place-items: center;
}
.side-dot::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
  transition: transform var(--transition), background-color var(--transition), box-shadow var(--transition);
}
.side-dot:hover::before { background: var(--text-muted); }
.side-dot.active::before {
  background: var(--accent-light);
  box-shadow: 0 0 10px var(--accent-glow); transform: scale(1.5);
}
/* Nokta üzerine gelince bölüm adı */
.side-dot::after {
  content: attr(aria-label);
  position: absolute; left: calc(100% + 10px); top: 50%;
  transform: translate(-4px, -50%);
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.08em; white-space: nowrap;
  color: var(--text-main); background: var(--card-bg);
  border: 1px solid var(--border-color); border-radius: 6px;
  padding: 3px 10px;
  opacity: 0; pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
}
.side-dot:hover::after, .side-dot:focus-visible::after { opacity: 1; transform: translate(0, -50%); }
.side-readout {
  font-family: var(--font-mono); font-size: 0.8rem;
  color: var(--text-main); margin-top: 4px;
}

/* Butonlar (Referans görsele uygun) */
.btn {
  position: relative; overflow: hidden; isolation: isolate;
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 52px;
  font-weight: 600; font-size: 0.85rem; letter-spacing: 0.08em;
  padding: 14px 28px; border-radius: var(--radius-sm);
  border: 1px solid transparent;
  text-transform: uppercase;
  transition: transform var(--transition), box-shadow var(--transition),
              border-color var(--transition), background-color var(--transition), color var(--transition);
}
.btn-icon { transition: transform var(--transition); }
.btn:hover .btn-icon { transform: translateX(3px); }

.btn-primary {
  background: linear-gradient(135deg, var(--accent-light), var(--accent-dark));
  color: #fff;
  box-shadow: 0 10px 28px -8px var(--accent-glow), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}
/* Hover sırasında ışık geçişi */
.btn-primary::after {
  content: ''; position: absolute; inset: 0; z-index: -1;
  background: linear-gradient(110deg, transparent 30%, rgba(255, 255, 255, 0.25) 50%, transparent 70%);
  transform: translateX(-100%);
  transition: transform 0.7s var(--ease-out);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 36px -10px rgba(157, 78, 221, 0.75), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}
.btn-primary:hover::after { transform: translateX(100%); }

.btn-outline {
  border-color: var(--border-strong); color: var(--text-main);
  background-color: rgba(255, 255, 255, 0.03);
}
.btn-outline:hover {
  border-color: var(--border-hover);
  background-color: rgba(157, 78, 221, 0.1);
  transform: translateY(-2px);
}
.btn:active { transform: translateY(0) scale(0.98); }
.btn-block { width: 100%; }

/* Scroll Animasyonları */
.js .reveal { opacity: 0; }
.js .reveal.visible { opacity: 1; animation: reveal-up 0.8s var(--ease-out) backwards; }

@keyframes reveal-up {
  from { opacity: 0; transform: translateY(28px); }
}

/* HERO GİRİŞ ANİMASYONU */
.hero-text > *, .hero-image { animation: reveal-up 0.9s var(--ease-out) backwards; }
.hero-text > :nth-child(2) { animation-delay: 0.08s; }
.hero-text > :nth-child(3) { animation-delay: 0.16s; }
.hero-text > :nth-child(4) { animation-delay: 0.24s; }
.hero-text > :nth-child(5) { animation-delay: 0.32s; }
.hero-text > :nth-child(6) { animation-delay: 0.4s; }
.hero-image { animation-delay: 0.2s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal, .js .reveal.visible, .hero-text > *, .hero-image { opacity: 1; animation: none; }
  .cursor { animation: none; }
  .floating-code { animation: none !important; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}

/* Navigasyon */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 500;
  padding: 14px 16px 0;
  pointer-events: none;
}
/* Yüzen kapsül menü */
.nav-container {
  position: relative; pointer-events: auto;
  width: 100%; max-width: calc(var(--container) - 32px); height: 60px; margin: 0 auto;
  padding: 0 8px 0 20px;
  display: flex; align-items: center; justify-content: space-between;
  background: rgba(16, 15, 21, 0.55);
  border: 1px solid var(--border-color); border-radius: 18px;
  backdrop-filter: blur(14px) saturate(150%); -webkit-backdrop-filter: blur(14px) saturate(150%);
  transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.navbar.scrolled .nav-container, .navbar.menu-open .nav-container {
  background: rgba(16, 15, 21, 0.86);
  border-color: var(--border-strong);
  box-shadow: 0 18px 40px -20px rgba(0, 0, 0, 0.85);
}
.nav-brand {
  font-family: var(--font-display); font-weight: 700; font-size: 1.4rem;
  letter-spacing: -0.01em; color: var(--text-main);
  transition: opacity var(--transition);
}
.nav-brand span { color: var(--accent-light); }
.nav-brand:hover { opacity: 0.85; }

.nav-menu { display: flex; gap: 4px; }
.nav-link {
  display: inline-flex; align-items: center;
  padding: 8px 14px; border-radius: 10px;
  font-size: 0.88rem; font-weight: 500; color: var(--text-muted);
  transition: color var(--transition), background-color var(--transition), box-shadow var(--transition);
}
.nav-link:hover { color: var(--text-main); background-color: rgba(255, 255, 255, 0.05); }
.nav-link.active {
  color: #fff;
  background-color: var(--accent-soft);
  box-shadow: inset 0 0 0 1px var(--accent-line);
}

.nav-toggle {
  display: none; flex-direction: column; justify-content: center; align-items: center; gap: 6px;
  width: 44px; height: 44px; border-radius: 12px;
  transition: background-color var(--transition);
}
.nav-toggle:hover { background-color: rgba(255, 255, 255, 0.05); }
.nav-toggle span {
  width: 22px; height: 2px; background: var(--text-main); border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* Hero Alanı & Fotoğraf */
.hero {
  position: relative; isolation: isolate;
  min-height: 100vh; min-height: 100svh;
  display: flex; align-items: center;
  padding: calc(var(--nav-h) + 48px) 0 96px;
}
/* Mühendislik ızgarası (hero arka planı) */
.hero::before {
  content: ''; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 64px 64px;
  background-position: center top;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 60% 40%, #000 20%, transparent 75%);
  mask-image: radial-gradient(ellipse 80% 70% at 60% 40%, #000 20%, transparent 75%);
}
.hero-content { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: clamp(40px, 6vw, 80px); align-items: center; }
.hero-text h1 {
  font-size: clamp(2.5rem, 1.4rem + 4.6vw, 5.2rem);
  line-height: 1.02; letter-spacing: -0.035em;
  margin-bottom: 22px; color: var(--text-main);
}
.hero-role { font-size: clamp(1.05rem, 1rem + 0.4vw, 1.3rem); color: var(--text-soft); font-weight: 500; margin-bottom: 18px; }
.hero-paragraph { max-width: 54ch; color: var(--text-muted); margin-bottom: 36px; font-size: 1.05rem; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }

/* Hero istatistikleri */
.hero-stats {
  display: flex; max-width: 520px;
  margin-top: 48px; padding-top: 28px;
  border-top: 1px solid var(--border-color);
}
.hero-stats li {
  flex: 1; display: flex; flex-direction: column; gap: 6px;
  padding: 0 20px; border-left: 1px solid var(--border-color);
}
.hero-stats li:first-child { padding-left: 0; border-left: 0; }
.hero-stats strong {
  font-family: var(--font-display); font-size: 2.2rem; font-weight: 500; line-height: 1;
  color: var(--text-main);
}
.hero-stats span {
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--text-muted); line-height: 1.4;
}

.hero-image { display: flex; justify-content: flex-end; }
.hero-image-wrapper { position: relative; width: 100%; max-width: 370px; }
/* Fotoğrafın arkasındaki nokta deseni */
.hero-image-wrapper::before {
  content: ''; position: absolute; left: -36px; bottom: -36px; width: 160px; height: 160px;
  background-image: radial-gradient(rgba(183, 126, 240, 0.55) 1.2px, transparent 1.7px);
  background-size: 14px 14px;
  -webkit-mask-image: linear-gradient(45deg, #000 30%, transparent 85%);
  mask-image: linear-gradient(45deg, #000 30%, transparent 85%);
  transition: transform 0.6s var(--ease-out);
}
.hero-image-wrapper:hover::before { transform: translate(-6px, 6px); }
/* Fotoğrafın arkasındaki mor ışık */
.hero-image-wrapper::after {
  content: ''; position: absolute; inset: -22%; z-index: -1; pointer-events: none;
  background: radial-gradient(closest-side, rgba(157, 78, 221, 0.3), rgba(109, 40, 217, 0.08) 55%, transparent);
}

/* Profil Fotoğrafı (Dikdörtgen ve Modern) */
.hero-image-frame {
  position: relative; z-index: 2; isolation: isolate;
  width: 100%; aspect-ratio: 3 / 4;
  border-radius: 26px; overflow: hidden;
  border: 1px solid transparent;
  background:
    linear-gradient(var(--card-bg), var(--card-bg)) padding-box,
    linear-gradient(155deg, rgba(224, 195, 252, 0.7), rgba(255, 255, 255, 0.06) 40%, rgba(255, 255, 255, 0.04) 60%, rgba(109, 40, 217, 0.7)) border-box;
  box-shadow: 0 40px 80px -30px rgba(0, 0, 0, 0.85), 0 0 60px -20px rgba(157, 78, 221, 0.35);
  transition: transform 0.6s var(--ease-out), box-shadow 0.6s var(--ease-out);
}
.hero-image-frame::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(to top, rgba(10, 10, 12, 0.4), transparent 45%);
}
.hero-image-wrapper:hover .hero-image-frame {
  transform: translateY(-6px);
  box-shadow: 0 50px 90px -30px rgba(0, 0, 0, 0.9), 0 0 80px -16px rgba(157, 78, 221, 0.5);
}
.hero-image-frame img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.8s var(--ease-out); }
.hero-image-wrapper:hover .hero-image-frame img { transform: scale(1.04); }
.hero-image-fallback {
  display: none; position: absolute; inset: 0;
  flex-direction: column; align-items: center; justify-content: center; gap: 14px;
  color: var(--text-muted); text-align: center; font-size: 0.85rem;
}
.hero-image-fallback svg { width: 40px; height: 40px; opacity: 0.5; }

/* Kod Satırları Efekti (Performans dostu animasyonlar) */
.floating-code {
  position: absolute; z-index: 3;
  font-family: var(--font-mono); font-size: 0.78rem;
  color: var(--accent-pale);
  background: rgba(20, 18, 27, 0.94);
  padding: 7px 14px; border-radius: 10px;
  border: 1px solid var(--accent-line);
  box-shadow: 0 10px 24px -10px rgba(0, 0, 0, 0.7);
  pointer-events: none;
}
.code-1 { top: 14%; left: -40px; animation: float 9s ease-in-out infinite; }
.code-2 { bottom: 22%; right: -24px; animation: float 10s ease-in-out infinite -3s; }
.code-3 { top: 60%; left: -54px; animation: float 8s ease-in-out infinite -5s; }
.code-4 { top: -16px; right: 28px; animation: float 11s ease-in-out infinite -2s; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* Bölümler */
.section { padding: var(--section-space) 0; position: relative; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }
/* Bölüm üst kenarındaki ince ışık çizgisi */
.section-alt::before {
  content: ''; position: absolute; top: -1px; left: 50%;
  width: min(640px, 80%); height: 1px; transform: translateX(-50%);
  background: linear-gradient(90deg, transparent, rgba(157, 78, 221, 0.6), transparent);
}
main > .section-alt:last-child { border-bottom: 0; }
.section-header { position: relative; isolation: isolate; margin-bottom: clamp(48px, 6vw, 72px); }
/* Başlığın arkasındaki büyük bölüm numarası */
.section-header::after {
  content: attr(data-num);
  position: absolute; right: 0; top: 50%; z-index: -1;
  transform: translateY(-50%);
  font-family: var(--font-display); font-weight: 700; line-height: 1;
  font-size: clamp(5rem, 13vw, 10rem);
  color: transparent; -webkit-text-stroke: 1px rgba(183, 126, 240, 0.18);
  pointer-events: none; user-select: none;
}
.section-title { font-size: clamp(2.1rem, 1.4rem + 2.8vw, 3.4rem); color: var(--text-main); }
.section-desc { color: var(--text-muted); margin-top: 20px; font-size: 1.1rem; max-width: 600px; }

/* Modern Kart Tasarımı (Ortak Class) */
.modern-card {
  position: relative;
  background-color: var(--card-bg);
  background-image: linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0) 60%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04), 0 10px 30px -18px rgba(0, 0, 0, 0.6);
  transition: transform 0.4s var(--ease-out), border-color var(--transition),
              background-color var(--transition), box-shadow 0.4s var(--ease-out);
}
/* Üst kenar ışık çizgisi */
.modern-card::before {
  content: ''; position: absolute; top: -1px; left: 14%; right: 14%; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-bright), transparent);
  opacity: 0; pointer-events: none;
  transition: opacity 0.4s var(--ease);
}
.modern-card:hover {
  background-color: var(--card-hover);
  border-color: var(--border-hover);
  transform: translateY(-6px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05), 0 28px 50px -24px rgba(0, 0, 0, 0.85), 0 0 44px -14px rgba(157, 78, 221, 0.3);
}
.modern-card:hover::before { opacity: 1; }

/* İkon kutusu (yetenek ve iletişim kartları) */
.skill-icon, .contact-icon {
  display: grid; place-items: center; flex-shrink: 0;
  width: 48px; height: 48px; border-radius: 14px;
  color: var(--accent-bright);
  background-color: rgba(157, 78, 221, 0.12);
  border: 1px solid var(--accent-line);
  transition: background-color var(--transition), color var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.skill-icon svg { width: 22px; height: 22px; }
.contact-icon svg { width: 20px; height: 20px; }

/* Zaman Çizelgesi */
.timeline { position: relative; }
.timeline::before {
  content: ''; position: absolute; left: 7px; top: 12px; bottom: 12px; width: 1px;
  background: linear-gradient(to bottom, var(--accent-light), var(--border-color) 30%, var(--border-color) 70%, transparent);
}
.timeline-item { position: relative; padding-left: 48px; margin-bottom: 24px; }
.timeline-item:last-child { margin-bottom: 0; }
.timeline-dot {
  position: absolute; left: 2px; top: 40px; width: 11px; height: 11px;
  border-radius: 50%; background: var(--bg-alt);
  border: 2px solid var(--accent-light);
  box-shadow: 0 0 0 4px var(--bg-alt), 0 0 12px var(--accent-glow);
  transition: background-color var(--transition);
}
.timeline-item:hover .timeline-dot { background: var(--accent-light); }
.timeline-content { display: block; padding: 32px 64px 32px 36px; }
/* Dış bağlantı oku */
.timeline-content::after {
  content: '↗'; position: absolute; top: 28px; right: 28px;
  color: var(--text-muted); opacity: 0.5;
  transition: opacity var(--transition), transform var(--transition), color var(--transition);
}
.timeline-content:hover::after { opacity: 1; color: var(--accent-bright); transform: translate(2px, -2px); }
.timeline-date {
  display: flex; align-items: center; flex-wrap: wrap; gap: 10px;
  font-family: var(--font-mono); font-size: 0.8rem; letter-spacing: 0.04em;
  color: var(--accent-bright); margin-bottom: 14px;
}
/* Durum etiketi (Devam Ediyor / Başlıyor) */
.timeline-status {
color: #34d399; background: rgba(16, 185, 129, 0.1); border-color: rgba(16, 185, 129, 0.3); }
.timeline-status.is-active::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: currentColor; box-shadow: 0 0 8px currentColor;
}
.timeline-status.is-active { color: #34d399; background: rgba(16, 185, 129, 0.1); border-color: rgba(16, 185, 129, 0.3); }
.timeline-status.is-active::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: currentColor; box-shadow: 0 0 8px currentColor;
}
.timeline-content h3 { font-size: clamp(1.3rem, 1.1rem + 0.7vw, 1.6rem); margin-bottom: 6px; }
.timeline-sub { color: var(--text-soft); font-size: 0.95rem; margin-bottom: 14px; }
.timeline-content p:last-child { color: var(--text-muted); }

/* Yetenekler */
.skills-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; counter-reset: skill; }
.skill-card {
  counter-increment: skill;
  display: flex; flex-direction: column;
  min-height: 200px; padding: 28px;
}
.skill-card .skill-icon { margin-bottom: auto; }
/* Kart numarası (01, 02...) */
.skill-card::after {
  content: counter(skill, decimal-leading-zero);
  position: absolute; top: 28px; right: 28px;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.1em;
  color: var(--text-muted);
  transition: color var(--transition);
}
.skill-card:hover::after { color: var(--accent-bright); }
.skill-card:hover .skill-icon {
  color: #fff; background-color: var(--accent-light); border-color: var(--accent-light);
  box-shadow: 0 10px 24px -8px var(--accent-glow);
}
.skill-card h3 { margin-top: 28px; font-family: var(--font-body); font-size: 1.15rem; font-weight: 600; letter-spacing: -0.01em; }
.skill-type {
  margin-top: 4px;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--text-muted);
}

/* Sertifikalar */
.certificates-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr)); gap: 20px; }
.cert-card { padding: 28px 32px 32px; display: flex; flex-direction: column; }
/* Köşedeki mor ışık */
.cert-card::after {
  content: ''; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  background: radial-gradient(circle at 100% 0%, rgba(157, 78, 221, 0.18), transparent 55%);
  opacity: 0.5; transition: opacity 0.4s var(--ease);
}
.cert-card:hover::after { opacity: 1; }
.cert-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 32px; }
.cert-badge {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.08em;
  color: var(--accent-bright); background: var(--accent-soft);
  padding: 5px 12px; border-radius: 999px; border: 1px solid var(--accent-line);
}
.cert-link {
  width: 42px; height: 42px; display: flex; align-items: center; justify-content: center;
  border-radius: 50%; border: 1px solid var(--border-strong); color: var(--text-muted);
  transition: background-color var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition);
}
/* Kartın tamamını tıklanabilir yap */
.cert-link::after { content: ''; position: absolute; inset: 0; border-radius: var(--radius); }
.cert-card:hover .cert-link { background: var(--accent-light); border-color: var(--accent-light); color: #fff; box-shadow: 0 0 16px var(--accent-glow); }
.cert-card h3 { font-size: 1.18rem; margin-bottom: 24px; line-height: 1.45; }
.cert-meta {
  margin-top: auto; padding-top: 16px; border-top: 1px solid var(--border-color);
  color: var(--text-muted); font-size: 0.875rem;
}

/* Projeler */
.project-showcase {
  display: grid; grid-template-columns: 1fr 1.25fr; gap: clamp(32px, 5vw, 64px); align-items: center;
  padding: clamp(24px, 4vw, 48px);
  border: 1px solid var(--border-color); border-radius: 28px;
  background:
    radial-gradient(ellipse at 100% 0%, rgba(157, 78, 221, 0.18), transparent 55%),
    radial-gradient(ellipse at 0% 100%, rgba(109, 40, 217, 0.1), transparent 50%),
    var(--card-bg);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}
.project-info h3 { font-size: clamp(2.1rem, 1.5rem + 2.2vw, 3rem); margin-bottom: 18px; }
.project-info p { color: var(--text-muted); margin-bottom: 28px; font-size: 1.05rem; }
.project-info .project-label {
  display: inline-block; margin-bottom: 16px;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--accent-bright);
}
.project-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 36px; }
.project-tags span {
  font-family: var(--font-mono); font-size: 0.74rem;
  padding: 5px 14px; border-radius: 999px;
  color: var(--text-soft); background: rgba(255, 255, 255, 0.04); border: 1px solid var(--border-strong);
}
.project-image-container { overflow: hidden; aspect-ratio: 16 / 10; display: flex; flex-direction: column; background-color: var(--bg-main); }
.project-image-container::before { top: 0; }
/* Tarayıcı penceresi çubuğu */
.browser-bar {
  display: flex; align-items: center; gap: 6px; flex-shrink: 0;
  height: 38px; padding: 0 53px 0 14px;
  background: rgba(255, 255, 255, 0.03); border-bottom: 1px solid var(--border-color);
}
.browser-bar span { width: 10px; height: 10px; border-radius: 50%; background: rgba(255, 255, 255, 0.14); }
.browser-bar span:nth-child(1) { background: rgba(244, 63, 94, 0.7); }
.browser-bar span:nth-child(2) { background: rgba(250, 204, 21, 0.7); }
.browser-bar span:nth-child(3) { background: rgba(16, 185, 129, 0.7); }
.browser-bar p {
  margin: 0 auto; padding: 2px 16px; border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-muted);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.project-image-container video {
  flex: 1; min-height: 0; width: 100%; object-fit: cover;
  transition: transform 0.8s var(--ease-out);
}
.project-image-container:hover video { transform: scale(1.02); }
.project-image-fallback {
  display: none; flex: 1; flex-direction: column; align-items: center; justify-content: center; gap: 14px;
  color: var(--text-muted); font-family: var(--font-mono); font-size: 0.85rem; text-align: center;
}
.project-image-fallback svg { width: 40px; height: 40px; opacity: 0.5; }

/* İletişim */
.contact-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: clamp(32px, 5vw, 56px); align-items: start; }
.contact-info { display: flex; flex-direction: column; gap: 14px; }
.contact-item {
  position: relative;
  display: grid; grid-template-columns: 48px minmax(0, 1fr); column-gap: 16px;
  padding: 18px 20px;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color); border-radius: var(--radius);
  transition: border-color var(--transition), background-color var(--transition), transform 0.4s var(--ease-out);
}
.contact-icon { grid-row: span 2; align-self: center; }
.contact-label {
  align-self: end;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.12em;
  color: var(--text-muted); text-transform: uppercase;
}
.contact-item a {
  align-self: start; justify-self: start;
  display: inline-flex; align-items: center; gap: 8px;
  font-size: clamp(1rem, 0.95rem + 0.3vw, 1.12rem); font-weight: 500;
  overflow-wrap: anywhere;
  transition: color var(--transition);
}
/* Kartın tamamını tıklanabilir yap */
.contact-item a::after { content: ''; position: absolute; inset: 0; border-radius: var(--radius); }
.contact-item a span { transition: transform var(--transition); }
.contact-item:hover { border-color: var(--border-hover); background-color: var(--card-hover); transform: translateY(-3px); }
.contact-item:hover a { color: var(--accent-bright); }
.contact-item:hover a span { transform: translate(3px, -3px); }
.contact-item:hover .contact-icon { color: #fff; background-color: var(--accent-light); border-color: var(--accent-light); }

.contact-form { padding: clamp(24px, 4vw, 40px); display: flex; flex-direction: column; gap: 22px; }
.contact-form:hover { transform: none; }
.contact-form:focus-within { border-color: var(--border-hover); }
.contact-form:focus-within::before { opacity: 1; }
.form-row { display: flex; flex-direction: column; gap: 8px; }
.form-row label { font-size: 0.85rem; font-weight: 500; color: var(--text-soft); }
.form-row input, .form-row textarea {
  width: 100%;
  background: rgba(0, 0, 0, 0.28); border: 1px solid var(--border-color);
  border-radius: var(--radius-sm); padding: 14px 16px; font-size: 1rem; line-height: 1.5;
  color: var(--text-main);
  transition: border-color var(--transition), box-shadow var(--transition), background-color var(--transition);
}
.form-row textarea { resize: vertical; min-height: 140px; }
.form-row input::placeholder, .form-row textarea::placeholder { color: #6b6780; }
.form-row input:hover, .form-row textarea:hover { border-color: var(--border-strong); }
.form-row input:focus, .form-row textarea:focus {
  outline: none;
  border-color: var(--accent-light);
  box-shadow: 0 0 0 3px var(--accent-soft);
  background: rgba(0, 0, 0, 0.42);
}
.form-row [aria-invalid="true"] { border-color: #f43f5e; }
.form-message { font-size: 0.9rem; min-height: 1.5em; text-align: center; }
.form-message.error { color: #f43f5e; }
.form-message.success { color: #10b981; }

/* Footer */
.footer { padding: 40px 0; border-top: 1px solid var(--border-color); }
.footer-content {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px 32px;
  color: var(--text-muted); font-size: 0.875rem;
}
.footer-note { font-family: var(--font-mono); font-size: 0.75rem; letter-spacing: 0.04em; }
.scroll-top {
  position: fixed; right: 24px; bottom: 24px; z-index: 400;
  width: 48px; height: 48px; border-radius: 14px;
  border: 1px solid var(--border-strong); background: rgba(22, 21, 28, 0.92);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted);
  box-shadow: 0 10px 24px -10px rgba(0, 0, 0, 0.7);
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition),
              border-color var(--transition), color var(--transition), box-shadow var(--transition);
}
.scroll-top.visible { opacity: 1; visibility: visible; transform: none; }
.scroll-top:hover { border-color: var(--accent-light); color: var(--accent-light); box-shadow: 0 0 18px -4px var(--accent-glow); transform: translateY(-3px); }

/* Responsive Düzenlemeler */
@media (min-width: 969px) {
  /* Eğitim bölümü: başlık solda, zaman çizelgesi sağda */
  .section-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.7fr); gap: 64px; align-items: start; }
  .section-split .section-header { position: sticky; top: calc(var(--nav-h) + 32px); margin-bottom: 0; }
}

@media (max-width: 1240px) {
  .side-panel { display: none; } /* Yan paneli mobilde ve küçük tabletlerde gizle */
}

@media (max-width: 968px) {
  .hero { min-height: auto; padding: calc(var(--nav-h) + 40px) 0 88px; }
  .hero::before {
    -webkit-mask-image: radial-gradient(ellipse 100% 60% at 50% 25%, #000 20%, transparent 75%);
    mask-image: radial-gradient(ellipse 100% 60% at 50% 25%, #000 20%, transparent 75%);
  }
  .hero-content { grid-template-columns: 1fr; text-align: center; gap: 56px; }
  .hero-image { justify-content: center; order: -1; }
  .hero-image-wrapper { max-width: 280px; }
  .hero-paragraph { margin-left: auto; margin-right: auto; }
  .hero-cta { justify-content: center; }
  .hero-stats { margin-left: auto; margin-right: auto; }
  .hero-stats li, .hero-stats li:first-child { align-items: center; padding: 0 12px; }
  .hero-stats li:first-child { border-left: 0; }

  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .project-showcase { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }

  .nav-toggle { display: flex; }
  .nav-menu {
    position: absolute; top: calc(100% + 8px); left: 0; right: 0;
    max-height: calc(100vh - var(--nav-h) - 16px); overflow-y: auto;
    flex-direction: column; gap: 2px; padding: 8px;
    background: rgba(16, 15, 21, 0.97);
    border: 1px solid var(--border-strong); border-radius: 18px;
    box-shadow: 0 24px 48px -20px rgba(0, 0, 0, 0.85);
    opacity: 0; visibility: hidden; transform: translateY(-8px);
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  }
  .nav-menu.open { opacity: 1; visibility: visible; transform: translateY(0); }
  .nav-link { display: flex; padding: 14px 16px; font-size: 1rem; border-radius: 12px; }

  .floating-code { display: none; } /* Mobilde ekranı daraltmamak için kodu gizle */
}

@media (max-width: 640px) {
  :root { --gutter: 20px; --nav-h: 80px; --radius: 16px; }
  .navbar { padding: 10px 12px 0; }
  .nav-container { height: 56px; padding: 0 6px 0 16px; border-radius: 16px; }

  .hero-image-wrapper { max-width: 230px; }
  .hero-image-wrapper::before { width: 110px; height: 110px; left: -22px; bottom: -22px; }
  .hero-stats { margin-top: 40px; padding-top: 24px; }
  .hero-stats strong { font-size: 1.7rem; }
  .hero-stats span { font-size: 0.62rem; }

  .section-header::after { font-size: 4.5rem; top: 0; transform: none; }

  .timeline-item { padding-left: 32px; }
  .timeline-dot { top: 32px; }
  .timeline-content { padding: 24px 48px 24px 24px; }
  .timeline-content::after { top: 20px; right: 20px; }

  .skills-grid { gap: 12px; }
  .skill-card { min-height: 170px; padding: 18px; }
  .skill-card::after { top: 18px; right: 18px; }
  .skill-icon { width: 42px; height: 42px; border-radius: 12px; }
  .skill-card h3 { margin-top: 20px; font-size: 1rem; }
  .skill-type { font-size: 0.64rem; }
  .cert-card { padding: 24px; }

  .project-showcase { padding: 16px 16px 24px; border-radius: 22px; }
  .project-info { padding: 0 4px; }
  .contact-item { padding: 16px; }

  .footer-content { flex-direction: column; justify-content: center; text-align: center; }
  .scroll-top { right: 16px; bottom: 16px; width: 44px; height: 44px; }
}

@media (max-width: 480px) {
  .hero-cta { flex-direction: column; }
  .hero-cta .btn { width: 100%; }
}