/* ============================================
   FURKAN GÜRER - KİŞİSEL PORTFOLYO
   Tasarım Sistemi ve Stil Dosyası
   ============================================ */

/* Google Fonts - Modern tipografi */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ---- CSS Değişkenleri (Design Tokens) ---- */
:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #141414;
  --bg-card: rgba(20, 20, 20, 0.6);
  --text-primary: #FFFFFF;
  --text-secondary: #E0E0E0;
  --text-muted: #888;
  --accent: #C8102E;
  --accent-dark: #9B0A1E;
  --accent-glow: rgba(200, 16, 46, 0.35);
  --accent-subtle: rgba(200, 16, 46, 0.12);
  --glass-bg: rgba(18, 18, 18, 0.6);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-border-hover: rgba(200, 16, 46, 0.45);
  --blur: 18px;
  --radius: 18px;
  --radius-sm: 12px;
  --transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  /* Eski değişken uyumluluğu */
  --red-dark: var(--accent-dark);
  --red-vivid: var(--accent);
  --red-glow: var(--accent-glow);
  --red-subtle: var(--accent-subtle);
}

/* ---- Reset ve Temel Stiller ---- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  /* Üstten siyah → alta doğru koyu gri geçiş */
  background: linear-gradient(180deg, #000000 0%, #111111 30%, #1a1a1a 60%, #222222 100%);
  background-attachment: fixed;
  min-height: 100vh;
  color: var(--text-primary);
  line-height: 1.85;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
}

ul { list-style: none; }

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

/* ---- Scroll Animasyonu - Elementlerin sayfaya yumuşak giriş yapması ---- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* ---- Navigasyon ---- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(10, 10, 10, 0.75);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border-bottom: 1px solid var(--glass-border);
  transition: var(--transition);
}

.navbar.scrolled {
  padding: 0.7rem 2rem;
  background: rgba(10, 10, 10, 0.92);
}

.nav-logo {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  transition: color var(--transition);
  letter-spacing: 0.3px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--red-vivid), var(--red-dark));
  transition: width var(--transition);
  border-radius: 2px;
}

.nav-links a:hover { color: var(--text-primary); }
.nav-links a:hover::after { width: 100%; }

/* Hamburger menü (mobil) */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  z-index: 1001;
}

.hamburger span {
  width: 26px;
  height: 2.5px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ---- Hero Section ---- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

#particle-canvas {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 950px;
  padding: 0 2rem;
}

/* Hero intro - fotoğraf ve metin yan yana */
.hero-intro {
  display: flex;
  align-items: center;
  gap: 3rem;
  margin-bottom: 2.5rem;
}

/* Hero profil fotoğrafı - yuvarlak, neon kırmızı glassmorphism çerçeve */
.hero-profile-img {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 3px solid rgba(200, 16, 46, 0.4);
  box-shadow:
    0 0 20px rgba(200, 16, 46, 0.25),
    0 0 60px rgba(200, 16, 46, 0.1),
    0 8px 32px rgba(0, 0, 0, 0.6),
    inset 0 0 30px rgba(0, 0, 0, 0.2);
  transition: all var(--transition);
  animation: hero-photo-pulse 4s ease-in-out infinite alternate;
}

.hero-profile-img:hover {
  border-color: rgba(200, 16, 46, 0.7);
  box-shadow:
    0 0 30px rgba(200, 16, 46, 0.4),
    0 0 80px rgba(200, 16, 46, 0.15),
    0 12px 48px rgba(0, 0, 0, 0.7),
    inset 0 0 30px rgba(0, 0, 0, 0.2);
  transform: scale(1.05);
}

@keyframes hero-photo-pulse {
  0%   { box-shadow: 0 0 20px rgba(200,16,46,0.25), 0 0 60px rgba(200,16,46,0.1), 0 8px 32px rgba(0,0,0,0.6); }
  100% { box-shadow: 0 0 25px rgba(200,16,46,0.35), 0 0 70px rgba(200,16,46,0.15), 0 8px 32px rgba(0,0,0,0.6); }
}

.hero-text {
  text-align: left;
}

.hero-content h1 {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 1.4rem;
  letter-spacing: -1px;
  background: linear-gradient(135deg, #fff 0%, var(--accent) 60%, var(--accent-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content p {
  font-size: clamp(1rem, 1.8vw, 1.18rem);
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 0 0;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---- Butonlar ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  border-radius: 50px;
  font-family: 'Inter', sans-serif;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 40px rgba(200, 16, 46, 0.55);
}

.btn-glass {
  background: var(--glass-bg);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn-glass:hover {
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(255, 255, 255, 0.06);
}

/* CV İndir - Outline stil buton (asil çerçeve) */
.btn-outline {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 4px 28px rgba(200, 16, 46, 0.25);
}

/* ---- Bölüm Genel Stili ---- */
.section {
  padding: 7rem 2.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 0.8rem;
  letter-spacing: -0.5px;
}

.section-header h2 span {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 550px;
  margin: 0 auto;
}

.section-divider {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-dark));
  margin: 1rem auto 0;
  border-radius: 3px;
}

/* ---- Hakkımda ---- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: start;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 1.02rem;
}

/* ---- Profil Fotoğrafı - Yuvarlak, premium glow ---- */
.about-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2.5rem;
}

.profile-img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 0 20px rgba(200, 16, 46, 0.15), 0 0 60px rgba(255, 255, 255, 0.04);
  transition: all var(--transition);
  flex-shrink: 0;
}

/* Hover - premium kırmızı-beyaz parlama */
.profile-img:hover {
  border-color: rgba(200, 16, 46, 0.4);
  box-shadow: 0 0 30px rgba(200, 16, 46, 0.3), 0 0 80px rgba(255, 255, 255, 0.06);
  transform: scale(1.03);
}

.about-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 2.5rem;
  box-shadow: var(--shadow);
  transition: all var(--transition);
}

.about-card:hover {
  border-color: rgba(255, 255, 255, 0.15);
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.5), 0 0 20px rgba(200, 16, 46, 0.08);
}

.about-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.about-card h3 .icon { color: var(--red-vivid); }

.info-item {
  display: flex;
  gap: 0.6rem;
  margin-bottom: 0.9rem;
  font-size: 0.95rem;
}

.info-item .label {
  color: var(--text-muted);
  min-width: 110px;
  font-weight: 500;
}

.info-item .value { color: var(--text-primary); }

.interests-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.5rem;
}

.interest-tag {
  padding: 0.45rem 1rem;
  background: var(--accent-subtle);
  border: 1px solid rgba(200, 16, 46, 0.2);
  border-radius: 50px;
  font-size: 0.82rem;
  color: #E0E0E0;
  font-weight: 500;
}

/* ---- Yetenekler ---- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 1.5rem;
}

.skill-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 1.8rem 1.2rem;
  text-align: center;
  cursor: default;
  transition: all var(--transition);
  box-shadow: var(--shadow);
}

/* Hover - premium glow efekti */
.skill-card:hover {
  transform: translateY(-8px);
  border-color: var(--accent);
  box-shadow: 0 12px 40px rgba(200, 16, 46, 0.18), 0 0 15px rgba(255, 255, 255, 0.03);
}

.skill-card .skill-icon {
  font-size: 2rem;
  margin-bottom: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
}

/* Hover durumunda ikon da kırmızıya döner */
.skill-card:hover .skill-icon {
  color: var(--red-vivid);
}

.skill-card .skill-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* ---- Projeler ---- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  transition: all var(--transition);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-dark));
  opacity: 0;
  transition: opacity var(--transition);
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--glass-border-hover);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5), 0 0 20px rgba(200, 16, 46, 0.1);
}

.project-card:hover::before { opacity: 1; }

.project-card .project-number {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--red-vivid);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
}

.project-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
}

.project-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  flex: 1;
  margin-bottom: 1.5rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.2rem;
}

.project-tags span {
  padding: 0.3rem 0.7rem;
  background: rgba(230, 0, 0, 0.08);
  border: 1px solid rgba(230, 0, 0, 0.15);
  border-radius: 50px;
  font-size: 0.75rem;
  color: #c66;
  font-weight: 500;
}

.project-link {
  align-self: flex-end;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--red-vivid);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: gap var(--transition);
}

.project-link:hover { gap: 0.8rem; }

/* ---- Sertifikalar (Dikey Liste) ---- */
.certificates-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 800px;
  margin: 0 auto;
}

.cert-card {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 2rem 2.2rem;
  transition: all var(--transition);
  box-shadow: var(--shadow);
}

.cert-card:hover {
  border-color: var(--glass-border-hover);
  transform: translateX(6px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5), 0 0 15px rgba(200, 16, 46, 0.1);
}

.cert-card .cert-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  min-width: 52px;
  background: var(--accent-subtle);
  border-radius: 14px;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.cert-card:hover .cert-icon {
  color: var(--red-vivid);
  background: rgba(200, 16, 46, 0.18);
}

.cert-card .cert-text {
  flex: 1;
}

.cert-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.4rem; }
.cert-card p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.6; }

/* ---- İletişim ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.contact-form {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 3rem;
  box-shadow: var(--shadow);
}

.form-group { margin-bottom: 1.5rem; }

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.9rem 1.2rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

/* Focus - ateş kırmızısı çerçeve */
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--red-vivid);
  box-shadow: 0 0 0 3px rgba(230, 0, 0, 0.15);
}

.form-group textarea { min-height: 140px; resize: vertical; }
.btn-submit { width: 100%; padding: 1rem; font-size: 1rem; }

/* İletişim bilgileri */
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.2rem 1.5rem;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.contact-item:hover { border-color: var(--glass-border-hover); }

.contact-item .c-icon {
  width: 44px; height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--red-subtle);
  border-radius: 12px;
  flex-shrink: 0;
}

.contact-item .c-icon svg { width: 20px; height: 20px; fill: var(--red-vivid); }

.contact-item .c-text h4 {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 0.2rem;
}

.contact-item .c-text p,
.contact-item .c-text a {
  font-size: 0.95rem;
  color: var(--text-primary);
  font-weight: 500;
}

.contact-item .c-text a:hover { color: var(--red-vivid); }

.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 0.5rem;
}

.social-link {
  width: 48px; height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  transition: all var(--transition);
}

.social-link svg {
  width: 22px; height: 22px;
  fill: var(--text-secondary);
  transition: fill var(--transition);
}

/* Hover - ikonlar kırmızıya döner */
.social-link:hover {
  border-color: var(--red-vivid);
  background: var(--red-subtle);
  transform: translateY(-3px);
}

.social-link:hover svg { fill: var(--red-vivid); }

/* ---- Footer ---- */
.footer {
  text-align: center;
  padding: 2.5rem 2rem;
  border-top: 1px solid var(--glass-border);
  font-size: 0.85rem;
}

.footer p {
  color: #999;
  letter-spacing: 0.3px;
}

/* ---- Ripple Efekti ---- */
.ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
  transform: scale(0);
  animation: ripple-anim 0.6s ease-out;
  pointer-events: none;
}

@keyframes ripple-anim {
  to { transform: scale(4); opacity: 0; }
}

/* ---- Responsive Tasarım ---- */
@media (max-width: 992px) {
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
  .profile-img { width: 160px; height: 160px; }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0; right: -100%;
    width: 75%; max-width: 320px; height: 100vh;
    background: rgba(10, 10, 10, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    gap: 2.5rem;
    transition: right 0.4s ease;
    border-left: 1px solid var(--glass-border);
  }

  .nav-links.open { right: 0; }
  .nav-links a { font-size: 1.1rem; }
  .hamburger { display: flex; }
  .section { padding: 4.5rem 1.2rem; }
  .hero-intro { flex-direction: column; gap: 1.5rem; text-align: center; }
  .hero-text { text-align: center; }
  .hero-profile-img { width: 140px; height: 140px; }
  .hero-content h1 { font-size: 2rem; }
  .skills-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 1rem; }
  .projects-grid { grid-template-columns: 1fr; }
  .profile-img { width: 140px; height: 140px; }
}

@media (max-width: 480px) {
  .hero-buttons { flex-direction: column; align-items: center; }
  .btn { width: 100%; justify-content: center; }
  .cert-card { padding: 1.5rem; }
}