/* ═══════════════════════════════════════════
   FATIH ÇELİK — PORTFOLIO STYLESHEET
   Dark / Professional · Cormorant + Barlow
═══════════════════════════════════════════ */

/* ─── CSS Variables ─── */
:root {
  --bg-primary:    #0f1115;
  --bg-secondary:  #151820;
  --bg-card:       #1a1e27;
  --bg-card-hover: #1f2430;
  --border:        #252b38;
  --border-light:  #2e3545;

  --text-primary:  #e8eaf0;
  --text-secondary:#9aa0b4;
  --text-muted:    #5a6278;
  --text-label:    #6b7491;

  --accent:        #7b9ccc;
  --accent-dim:    #4a6a9a;
  --accent-glow:   rgba(123, 156, 204, 0.12);
  --gold:          #c9a96e;
  --gold-dim:      rgba(201, 169, 110, 0.15);

  --font-display:  'Cormorant Garamond', Georgia, serif;
  --font-body:     'Barlow', system-ui, sans-serif;
  --font-condensed:'Barlow Condensed', system-ui, sans-serif;

  --nav-h:         64px;
  --radius:        6px;
  --radius-lg:     10px;
  --transition:    0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─── Reset ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ─── Language toggle ─── */
body.lang-en .tr { display: none !important; }
body.lang-tr .en { display: none !important; }

/* ─── Scrollbar ─── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; }

/* ─── Container ─── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ═══════════════════════ NAVIGATION ═══════════════════════ */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  background: rgba(15, 17, 21, 0);
  border-bottom: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition), backdrop-filter var(--transition);
}
#navbar.scrolled {
  background: rgba(15, 17, 21, 0.92);
  border-bottom-color: var(--border);
  backdrop-filter: blur(12px);
}
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-brand {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-right: auto;
  transition: opacity var(--transition);
}
.nav-brand:hover { opacity: 0.75; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.nav-links a {
  font-family: var(--font-condensed);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-secondary);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover { color: var(--text-primary); background: var(--bg-card); }

.lang-toggle {
  font-family: var(--font-condensed);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid var(--accent-dim);
  border-radius: var(--radius);
  padding: 0.3rem 0.7rem;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.lang-toggle:hover { background: var(--accent); color: var(--bg-primary); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ═══════════════════════ HERO ═══════════════════════ */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 60% at 60% 40%, rgba(123,156,204,0.06) 0%, transparent 65%),
    radial-gradient(ellipse 40% 50% at 20% 80%, rgba(201,169,110,0.04) 0%, transparent 60%);
  pointer-events: none;
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(37,43,56,0.35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37,43,56,0.35) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 100%);
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
  padding-top: var(--nav-h);
}
.hero-label {
  font-family: var(--font-condensed);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  opacity: 0;
  animation: fadeUp 0.8s 0.2s forwards;
}
.hero-name {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 9vw, 8rem);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  opacity: 0;
  animation: fadeUp 0.8s 0.35s forwards;
}
.hero-name span {
  font-style: italic;
  color: var(--text-secondary);
}
.hero-tagline {
  font-size: 1.1rem;
  font-weight: 300;
  color: var(--text-secondary);
  max-width: 580px;
  margin-bottom: 2.5rem;
  opacity: 0;
  animation: fadeUp 0.8s 0.5s forwards;
}
.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
  opacity: 0;
  animation: fadeUp 0.8s 0.65s forwards;
}
.btn {
  font-family: var(--font-condensed);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  transition: all var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent);
}
.btn-primary:hover { background: #9ab8e0; border-color: #9ab8e0; }
.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-light);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.hero-meta {
  font-family: var(--font-condensed);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  opacity: 0;
  animation: fadeUp 0.8s 0.8s forwards;
}
.hero-meta a:hover { color: var(--accent); }
.hero-meta .sep { opacity: 0.4; }
.hero-scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
}
.hero-scroll span {
  display: block;
  width: 1px;
  height: 50px;
  background: linear-gradient(to bottom, var(--border-light), transparent);
  animation: scrollLine 2s 1.5s ease-in-out infinite;
  opacity: 0;
}
@keyframes scrollLine {
  0%   { opacity: 0; transform: scaleY(0); transform-origin: top; }
  50%  { opacity: 1; }
  100% { opacity: 0; transform: scaleY(1); transform-origin: top; }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ═══════════════════════ SECTIONS ═══════════════════════ */
.section { padding: 7rem 0; }
.section-alt { background: var(--bg-secondary); }
.section-header { margin-bottom: 4rem; }
.section-label {
  display: block;
  font-family: var(--font-condensed);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  line-height: 1.1;
  color: var(--text-primary);
}

/* ═══════════════════════ ABOUT ═══════════════════════ */
.about-content {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 4rem;
  align-items: start;
}
.about-text p {
  color: var(--text-secondary);
  font-size: 0.97rem;
  margin-bottom: 1.25rem;
  line-height: 1.8;
}
.about-text p:last-child { margin-bottom: 0; }
.about-stats {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  position: sticky;
  top: calc(var(--nav-h) + 2rem);
}
.stat-item {
  text-align: center;
  padding: 1.75rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition);
}
.stat-item:hover { border-color: var(--accent-dim); }
.stat-number {
  display: block;
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 300;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.5rem;
}
.stat-label {
  font-family: var(--font-condensed);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ═══════════════════════ TIMELINE ═══════════════════════ */
.timeline {
  position: relative;
  padding-left: 2rem;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent-dim), var(--border), transparent);
}
.timeline-item {
  position: relative;
  margin-bottom: 3rem;
  padding-left: 2rem;
}
.timeline-item:last-child { margin-bottom: 0; }
.timeline-marker {
  position: absolute;
  left: -2rem;
  top: 8px;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-primary);
  box-shadow: 0 0 0 1px var(--accent-dim);
  transform: translateX(-3px);
}
.section-alt .timeline-marker { border-color: var(--bg-secondary); }
.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem 2rem;
  transition: border-color var(--transition), transform var(--transition);
}
.timeline-content:hover {
  border-color: var(--border-light);
  transform: translateX(3px);
}
.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}
.timeline-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}
.timeline-org {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 0.15rem;
}
.timeline-location {
  font-family: var(--font-condensed);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  text-transform: uppercase;
}
.timeline-date {
  font-family: var(--font-condensed);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--gold);
  background: var(--gold-dim);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius);
  white-space: nowrap;
  flex-shrink: 0;
}
.timeline-details {
  padding-left: 1rem;
}
.timeline-details li {
  position: relative;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.75;
  padding-left: 0.75rem;
  margin-bottom: 0.5rem;
}
.timeline-details li:last-child { margin-bottom: 0; }
.timeline-details li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--accent-dim);
}
.timeline-details-prose p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 0.75rem;
}
.timeline-details-prose p:last-child { margin-bottom: 0; }
.timeline-details-prose strong { color: var(--text-primary); font-weight: 500; }

/* ═══════════════════════ SUBSECTION / PROJECTS ═══════════════════════ */
.subsection { margin-top: 5rem; }
.subsection-title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}
.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: border-color var(--transition), transform var(--transition);
}
.project-card:hover { border-color: var(--accent-dim); transform: translateY(-2px); }
.project-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
.project-header h4 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.3;
}
.project-date {
  font-family: var(--font-condensed);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}
.project-card p {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 1.25rem;
}
.project-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tag {
  font-family: var(--font-condensed);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(123,156,204,0.2);
  padding: 0.2rem 0.55rem;
  border-radius: 3px;
}

/* ═══════════════════════ CERTIFICATIONS ═══════════════════════ */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  margin-bottom: 3.5rem;
}
.cert-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  transition: border-color var(--transition), transform var(--transition);
}
.cert-card:hover { border-color: var(--accent-dim); transform: translateY(-2px); }
.cert-icon {
  flex-shrink: 0;
  width: 36px; height: 36px;
  color: var(--accent);
  opacity: 0.75;
}
.cert-icon svg { width: 100%; height: 100%; }
.cert-title {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: 0.25rem;
}
.cert-issuer {
  font-family: var(--font-condensed);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

/* Achievements bar */
.achievements-bar {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4rem;
  flex-wrap: wrap;
}
.achievement-item {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.achievement-score {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 300;
  color: var(--gold);
  line-height: 1;
}
.achievement-score span {
  font-size: 1.3rem;
  color: var(--text-muted);
}
.achievement-label {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}
.achievement-year {
  font-family: var(--font-condensed);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--text-muted);
}
.achievement-divider {
  width: 1px;
  height: 60px;
  background: var(--border-light);
  flex-shrink: 0;
}

/* ═══════════════════════ SKILLS ═══════════════════════ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}
.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: border-color var(--transition);
}
.skill-category:hover { border-color: var(--border-light); }
.skill-cat-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}
.skill-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.skill-tag {
  font-family: var(--font-condensed);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  padding: 0.3rem 0.65rem;
  border-radius: 4px;
  transition: all var(--transition);
}
.skill-tag:hover { border-color: var(--accent-dim); color: var(--accent); }

/* Language bars */
.language-items { display: flex; flex-direction: column; gap: 1.25rem; }
.language-item {}
.lang-info-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.5rem;
}
.lang-name {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-primary);
}
.lang-level {
  font-family: var(--font-condensed);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}
.lang-bar {
  height: 2px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}
.lang-fill {
  height: 100%;
  background: linear-gradient(to right, var(--accent-dim), var(--accent));
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.lang-fill.animate { transform: scaleX(1); }

/* ═══════════════════════ CONTACT ═══════════════════════ */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  align-items: start;
}
.contact-text p {
  font-size: 0.97rem;
  color: var(--text-secondary);
  line-height: 1.8;
}
.contact-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}
.contact-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  transition: border-color var(--transition), transform var(--transition);
  cursor: pointer;
}
a.contact-card:hover { border-color: var(--accent-dim); transform: translateY(-2px); }
.contact-card.no-link { cursor: default; }
.contact-card svg {
  width: 20px; height: 20px;
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--accent);
  opacity: 0.8;
}
.contact-label {
  display: block;
  font-family: var(--font-condensed);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}
.contact-value {
  display: block;
  font-size: 0.85rem;
  color: var(--text-primary);
  word-break: break-all;
}

/* ═══════════════════════ FOOTER ═══════════════════════ */
footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  padding: 3rem 0;
  text-align: center;
}
.footer-name {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}
.footer-sub {
  font-family: var(--font-condensed);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.footer-copy {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ═══════════════════════ REVEAL ANIMATION ═══════════════════════ */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ═══════════════════════ RESPONSIVE ═══════════════════════ */
@media (max-width: 900px) {
  .about-content { grid-template-columns: 1fr; }
  .about-stats {
    flex-direction: row;
    position: static;
  }
  .stat-item { flex: 1; }
  .contact-layout { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 768px) {
  :root { --nav-h: 58px; }
  .section { padding: 5rem 0; }
  .container { padding: 0 1.25rem; }

  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    background: rgba(15, 17, 21, 0.97);
    backdrop-filter: blur(16px);
    flex-direction: column;
    padding: 1.5rem;
    gap: 0.25rem;
    border-bottom: 1px solid var(--border);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 0.75rem 1rem; width: 100%; font-size: 0.85rem; }
  .nav-toggle { display: flex; }

  .hero-name { font-size: clamp(2.8rem, 14vw, 5rem); }
  .hero-actions { flex-direction: column; width: fit-content; }

  .timeline { padding-left: 1.25rem; }
  .timeline-item { padding-left: 1.25rem; }
  .timeline-content { padding: 1.25rem 1.25rem; }
  .timeline-header { flex-direction: column; gap: 0.5rem; }
  .timeline-date { align-self: flex-start; }

  .achievements-bar { gap: 2rem; padding: 1.75rem 1.5rem; }
  .achievement-divider { display: none; }
  .achievements-bar { flex-direction: column; gap: 2rem; }

  .about-stats { flex-direction: column; }
}

@media (max-width: 480px) {
  .cert-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
}