/* ==========================================================================
   Omer Dengiz — omerdengiz.com
   Design tokens, layout, components, animations
   ========================================================================== */

:root {
  --bg-0: #07091a;
  --bg-1: #0b1020;
  --bg-2: #10173a;
  --surface: rgba(255, 255, 255, 0.03);
  --surface-2: rgba(255, 255, 255, 0.05);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);

  --text: #e7ecff;
  --text-dim: #a4adcf;
  --text-muted: #6c7499;

  --accent-1: #4cc9f0;   /* cyan */
  --accent-2: #7b2cbf;   /* purple */
  --accent-3: #f72585;   /* pink */
  --accent-aws: #ff9900;

  --grad-1: linear-gradient(135deg, #4cc9f0 0%, #7b2cbf 100%);
  --grad-2: linear-gradient(135deg, #f72585 0%, #7b2cbf 100%);

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;

  --shadow-1: 0 6px 24px rgba(0, 0, 0, 0.35);
  --shadow-2: 0 20px 60px rgba(76, 201, 240, 0.15);

  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --max: 1200px;
  --nav-h: 68px;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg-0);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
h1, h2, h3, h4 { margin: 0; line-height: 1.2; letter-spacing: -0.01em; }
p { margin: 0 0 1em; }
a { color: inherit; text-decoration: none; transition: color .2s ease, opacity .2s ease; }
a:hover { color: var(--accent-1); }
img, svg { max-width: 100%; display: block; }
ul { margin: 0; padding: 0; list-style: none; }
em { font-style: normal; color: var(--accent-1); }

/* Canvas background */
#bg-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
  background:
    radial-gradient(1200px 600px at 20% 0%, rgba(123, 44, 191, 0.22), transparent 70%),
    radial-gradient(1000px 600px at 80% 20%, rgba(76, 201, 240, 0.18), transparent 70%),
    linear-gradient(180deg, var(--bg-1) 0%, var(--bg-0) 100%);
}

/* ==========================================================================
   Navigation
   ========================================================================== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(20px, 4vw, 48px);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(11, 16, 32, 0.65);
  border-bottom: 1px solid transparent;
  transition: border-color .3s ease, background .3s ease;
  z-index: 100;
}
.nav.scrolled {
  border-bottom-color: var(--border);
  background: rgba(7, 9, 26, 0.85);
}
.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  letter-spacing: 0.05em;
}
.logo-mark {
  display: inline-grid;
  place-items: center;
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--grad-1);
  color: #07091a;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
}
.logo-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent-3);
  box-shadow: 0 0 12px var(--accent-3);
  animation: pulse 2s ease-in-out infinite;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
  font-weight: 500;
}
.nav-links a {
  color: var(--text-dim);
  position: relative;
  padding: 6px 0;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--grad-1);
  transition: right .25s ease;
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { right: 0; }
.nav-cta {
  padding: 8px 14px !important;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  color: var(--text) !important;
}
.nav-cta::after { display: none; }
.nav-cta:hover { border-color: var(--accent-1); background: rgba(76, 201, 240, 0.08); }

.nav-toggle {
  display: none;
  background: transparent;
  border: 0;
  padding: 8px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text);
  margin: 5px 0;
  transition: transform .25s ease, opacity .25s ease;
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 40px) clamp(20px, 4vw, 48px) 80px;
}
.hero-inner { max-width: var(--max); margin: 0 auto; width: 100%; }

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-dim);
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  margin: 0 0 28px;
}
.pulse-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #2ecc71;
  box-shadow: 0 0 10px #2ecc71;
  animation: pulse 1.8s ease-in-out infinite;
}

.hero-title {
  font-size: clamp(3rem, 10vw, 7.5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  margin: 0 0 16px;
  background: linear-gradient(180deg, #ffffff 0%, #a4adcf 120%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-title .word {
  display: inline-block;
  margin-right: 0.25em;
  opacity: 0;
  transform: translateY(30px);
  animation: word-in 0.9s cubic-bezier(.2,.8,.2,1) forwards;
}
.hero-title .word:nth-child(2) { animation-delay: 0.15s; }

.hero-subtitle {
  font-size: clamp(1.2rem, 2.4vw, 1.75rem);
  font-weight: 600;
  color: var(--text);
  min-height: 2.2em;
  margin: 0 0 20px;
}
.rotator {
  position: relative;
  display: inline-block;
  vertical-align: top;
}
.rotator-item {
  display: block;
  background: var(--grad-1);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .5s ease, transform .5s ease;
  position: absolute;
  inset: 0;
}
.rotator-item.active {
  opacity: 1;
  transform: translateY(0);
  position: relative;
}

.hero-desc {
  max-width: 640px;
  font-size: 1.05rem;
  color: var(--text-dim);
  margin: 0 0 32px;
}

.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 28px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
}
.btn-primary {
  background: var(--grad-1);
  color: #07091a;
  box-shadow: 0 8px 24px rgba(76, 201, 240, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(76, 201, 240, 0.5); color: #07091a; }
.btn-ghost {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-ghost:hover { background: var(--surface-2); border-color: var(--accent-1); color: var(--text); }

.hero-badges { display: flex; flex-wrap: wrap; gap: 10px; }
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
}
.badge-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent-1); }
.badge-dot.aws { background: var(--accent-aws); box-shadow: 0 0 8px var(--accent-aws); }

.hero-scroll {
  position: absolute;
  left: 50%; bottom: 28px;
  transform: translateX(-50%);
  opacity: 0.7;
}
.mouse {
  display: block;
  width: 22px; height: 36px;
  border: 1.5px solid var(--text-dim);
  border-radius: 12px;
  position: relative;
}
.wheel {
  position: absolute;
  top: 6px; left: 50%;
  transform: translateX(-50%);
  width: 3px; height: 6px;
  background: var(--text-dim);
  border-radius: 2px;
  animation: wheel 1.8s ease-in-out infinite;
}

/* ==========================================================================
   Generic section / layout
   ========================================================================== */
.section {
  padding: clamp(80px, 10vw, 140px) clamp(20px, 4vw, 48px);
  position: relative;
}
.container { max-width: var(--max); margin: 0 auto; }

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 700;
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 32px;
}
.section-num {
  font-family: var(--font-mono);
  font-size: 0.75em;
  color: var(--accent-1);
  font-weight: 500;
}
.section-sub { color: var(--text-dim); margin: -16px 0 32px; }

.two-col {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: start;
}
.lead { font-size: 1.15rem; color: var(--text); }

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 32px;
}
.stat {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}
.stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 600;
  background: var(--grad-1);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
}
.stat-label { display: block; font-size: 0.9rem; color: var(--text-dim); margin-top: 8px; }

.about-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  overflow: hidden;
  box-shadow: var(--shadow-1);
}
.card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.2);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
}
.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot.red { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green { background: #28c840; }
.card-title { margin-left: auto; }
.code {
  margin: 0;
  padding: 22px 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.75;
  color: var(--text);
  overflow-x: auto;
}
.code .k { color: var(--accent-1); }
.code .c { color: var(--text-muted); font-style: italic; }

/* ==========================================================================
   Capstone
   ========================================================================== */
.section-capstone { background: radial-gradient(ellipse at center, rgba(123, 44, 191, 0.08), transparent 70%); }

.capstone-card {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  background:
    linear-gradient(135deg, rgba(76, 201, 240, 0.06), rgba(123, 44, 191, 0.06)),
    var(--bg-1);
  box-shadow: var(--shadow-2);
  position: relative;
  overflow: hidden;
}
.capstone-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  padding: 1px;
  background: linear-gradient(135deg, rgba(76,201,240,0.4), rgba(123,44,191,0.4), transparent 60%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  pointer-events: none;
}
.capstone-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--accent-1);
  margin: 0 0 12px;
}
.capstone-title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  margin: 0 0 16px;
}
.capstone-lede { color: var(--text-dim); margin-bottom: 24px; }
.capstone-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-bottom: 24px;
}
.capstone-grid h4 {
  font-size: 0.95rem;
  margin: 0 0 10px;
  color: var(--accent-1);
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.05em;
}
.tick-list li {
  padding: 4px 0 4px 22px;
  position: relative;
  color: var(--text-dim);
  font-size: 0.95rem;
}
.tick-list li::before {
  content: "▹";
  color: var(--accent-1);
  position: absolute;
  left: 0;
}
.capstone-cta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 24px;
  flex-wrap: wrap;
}
.capstone-meta { color: var(--text-muted); font-family: var(--font-mono); font-size: 12px; }

.capstone-diagram {
  display: grid;
  place-items: center;
}
.capstone-diagram svg { width: 100%; max-width: 320px; height: auto; }
.orbit { transform-origin: 160px 160px; animation: rotate 14s linear infinite; }
.orbit-2 { animation-duration: 22s; animation-direction: reverse; }
.orbit-3 { animation-duration: 10s; }

/* ==========================================================================
   Projects
   ========================================================================== */
.filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}
.chip {
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  transition: color .2s ease, border-color .2s ease, background .2s ease;
}
.chip:hover { color: var(--text); border-color: var(--border-strong); }
.chip.active { color: #07091a; background: var(--grad-1); border-color: transparent; }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 22px;
}
.project {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: transform .3s ease, border-color .3s ease, background .3s ease, box-shadow .3s ease;
  position: relative;
}
.project:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  background: var(--surface-2);
  box-shadow: var(--shadow-1);
}
.project.featured {
  border-color: rgba(76, 201, 240, 0.4);
  background:
    linear-gradient(135deg, rgba(76, 201, 240, 0.05), rgba(123, 44, 191, 0.05)),
    var(--surface);
}
.project.hidden { display: none; }

.project-top { display: flex; flex-direction: column; gap: 4px; }
.project-icon { font-size: 28px; line-height: 1; margin-bottom: 4px; }
.project h3 { font-size: 1.2rem; font-weight: 600; }
.project-sub { color: var(--text-muted); font-family: var(--font-mono); font-size: 12px; margin: 0; }
.project p { color: var(--text-dim); font-size: 0.95rem; margin: 0; flex: 1; }

.tech-badges { display: flex; flex-wrap: wrap; gap: 6px; }
.tech {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 10px;
  color: var(--accent-1);
  background: rgba(76, 201, 240, 0.08);
  border: 1px solid rgba(76, 201, 240, 0.2);
  border-radius: 6px;
}

.project-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  font-size: 12px;
}
.role { color: var(--text-muted); font-family: var(--font-mono); }
.link-arrow { color: var(--accent-1); font-weight: 500; }

/* ==========================================================================
   Skills grid
   ========================================================================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 22px;
}
.skill-group {
  padding: 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color .2s ease, transform .2s ease;
}
.skill-group:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.skill-group h4 {
  font-size: 0.95rem;
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  color: var(--accent-1);
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.05em;
}
.skill-group li {
  padding: 4px 0 4px 18px;
  position: relative;
  font-size: 0.92rem;
  color: var(--text-dim);
}
.skill-group li::before {
  content: "›";
  position: absolute;
  left: 0;
  color: var(--accent-1);
  font-weight: 700;
}

/* ==========================================================================
   Timeline (experience)
   ========================================================================== */
.timeline { position: relative; padding-left: 28px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 8px; top: 6px; bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--accent-1), var(--accent-2), transparent);
}
.tl-item { position: relative; margin-bottom: 48px; }
.tl-item:last-child { margin-bottom: 0; }
.tl-marker {
  position: absolute;
  left: -26px; top: 6px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--grad-1);
  box-shadow: 0 0 0 4px rgba(76, 201, 240, 0.2);
}
.tl-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.tl-head h3 { font-size: 1.15rem; }
.tl-date { font-family: var(--font-mono); font-size: 12px; color: var(--text-muted); }
.tl-org { color: var(--accent-1); font-family: var(--font-mono); font-size: 13px; margin: 6px 0 10px; }
.tl-body ul { margin-top: 8px; }
.tl-body li {
  padding: 4px 0 4px 20px;
  position: relative;
  color: var(--text-dim);
  font-size: 0.95rem;
}
.tl-body li::before { content: "▹"; position: absolute; left: 0; color: var(--accent-1); }

/* ==========================================================================
   Education
   ========================================================================== */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 22px;
}
.edu-card {
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: transform .2s ease, border-color .2s ease, background .2s ease;
}
.edu-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  background: var(--surface-2);
}
.edu-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}
.edu-top h3 { font-size: 1.15rem; font-weight: 600; }
.edu-org { color: var(--accent-1); font-family: var(--font-mono); font-size: 13px; margin: 4px 0 0; }
.edu-date { font-family: var(--font-mono); font-size: 12px; color: var(--text-muted); white-space: nowrap; }
.edu-badges { display: flex; flex-wrap: wrap; gap: 8px; }
.edu-desc { color: var(--text-dim); font-size: 0.95rem; margin: 0; }

/* ==========================================================================
   Contact
   ========================================================================== */
.section-contact { padding-bottom: 120px; }
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 24px;
}
.contact-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: transform .2s ease, border-color .2s ease, background .2s ease;
}
.contact-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-1);
  background: var(--surface-2);
  color: var(--text);
}
.c-label { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; color: var(--text-muted); text-transform: uppercase; }
.c-value { font-weight: 500; }
.contact-cta { background: linear-gradient(135deg, rgba(76, 201, 240, 0.08), rgba(123, 44, 191, 0.08)); border-color: rgba(76, 201, 240, 0.3); }

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  padding: 40px clamp(20px, 4vw, 48px);
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.88rem;
  text-align: center;
}

/* ==========================================================================
   Reveal on scroll
   ========================================================================== */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .8s ease, transform .8s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ==========================================================================
   Keyframes
   ========================================================================== */
@keyframes word-in {
  to { opacity: 1; transform: none; }
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}
@keyframes wheel {
  0% { opacity: 1; transform: translate(-50%, 0); }
  100% { opacity: 0; transform: translate(-50%, 12px); }
}
@keyframes rotate {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 860px) {
  .nav-links { display: none; }
  .nav-toggle { display: block; }
  .nav.open .nav-links {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    position: absolute;
    top: var(--nav-h); left: 0; right: 0;
    padding: 20px 28px 28px;
    background: rgba(7, 9, 26, 0.96);
    border-bottom: 1px solid var(--border);
  }
  .two-col { grid-template-columns: 1fr; gap: 40px; }
  .capstone-card { grid-template-columns: 1fr; padding: 28px; }
  .capstone-diagram { order: -1; }
  .capstone-grid { grid-template-columns: 1fr; gap: 18px; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .hero { min-height: calc(100vh - 20px); }
}
@media (max-width: 480px) {
  .about-stats { grid-template-columns: 1fr; }
  .tl-head { flex-direction: column; gap: 2px; }
  .btn { width: 100%; justify-content: center; }
  .hero-cta { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
  html { scroll-behavior: auto; }
}