/* =========================================================
   Tarık Akgün — Siber Güvenlik Portföyü
   Terminal / hacker temalı dark theme
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap');

:root {
  --bg: #06090a;
  --bg-alt: #0b1012;
  --bg-card: #0e1517;
  --bg-card-hover: #101a1c;
  --border: #1c2b2c;
  --border-bright: #234040;
  --text: #c7d1cd;
  --text-dim: #7c8c89;
  --text-bright: #eef5f2;
  --green: #00ff8c;
  --green-dim: #00b869;
  --cyan: #26e0ff;
  --amber: #ffcf5c;
  --red: #ff5c5c;
  --mono: 'JetBrains Mono', 'Fira Code', Consolas, 'Courier New', monospace;
  --radius: 6px;
  --max-w: 1080px;
  --header-h: 68px;
  --glow: 0 0 12px rgba(0, 255, 140, 0.25);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1.7;
  min-height: 100vh;
  position: relative;
}

/* subtle scanline / grid backdrop */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 255, 140, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 140, 0.035) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
}

#matrixCanvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  opacity: 0.06;
  pointer-events: none;
}

a { color: var(--green); text-decoration: none; }
a:hover { color: var(--cyan); }

h1, h2, h3, h4 { color: var(--text-bright); margin: 0 0 .5em; font-weight: 600; letter-spacing: -0.01em; }

::selection { background: rgba(0, 255, 140, 0.25); color: var(--text-bright); }

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ---------------- Header / Nav ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(6, 9, 10, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  font-weight: 600;
  font-size: 15px;
  color: var(--text-bright);
  white-space: nowrap;
}
.brand .prompt { color: var(--green); }
.brand .prompt-sep { color: var(--text-dim); }
.brand .cursor {
  display: inline-block;
  color: var(--green);
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.nav-links {
  display: flex;
  gap: 6px;
  flex: 1;
  justify-content: center;
}
.nav-links a {
  color: var(--text-dim);
  padding: 8px 14px;
  border-radius: var(--radius);
  font-size: 14px;
  transition: color .15s, background .15s;
  white-space: nowrap;
}
.nav-links a .path { color: var(--border-bright); }
.nav-links a:hover { color: var(--text-bright); background: rgba(255,255,255,0.03); }
.nav-links a.active { color: var(--green); background: rgba(0,255,140,0.07); }
.nav-links a.active .path { color: var(--green-dim); }

.nav-actions { display: flex; align-items: center; gap: 14px; }

.lang-toggle {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 12px;
  padding: 6px 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: border-color .15s;
}
.lang-toggle:hover { border-color: var(--border-bright); }
.lang-toggle .lang-opt { padding: 1px 3px; color: var(--text-dim); }
.lang-toggle .lang-opt.active { color: var(--green); font-weight: 700; }
.lang-toggle .lang-sep { color: var(--border-bright); }

.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 34px;
  height: 34px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
}
.nav-burger span { display: block; height: 2px; width: 16px; margin: 0 auto; background: var(--green); }

/* ---------------- Hero ---------------- */
.hero {
  padding: 72px 0 56px;
  position: relative;
}

.term-window {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.term-titlebar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}
.term-dot { width: 11px; height: 11px; border-radius: 50%; }
.term-dot.red { background: #ff5f56; }
.term-dot.yellow { background: #ffbd2e; }
.term-dot.green { background: #27c93f; }
.term-titlebar span.title {
  margin-left: 10px;
  color: var(--text-dim);
  font-size: 12px;
}
.term-body { padding: 32px 36px 36px; }

.hero-greeting { color: var(--text-dim); font-size: 14px; margin-bottom: 6px; }
.hero-greeting::before { content: "$ whoami"; display: block; color: var(--green-dim); margin-bottom: 10px; font-size: 13px; }
.hero-name {
  font-size: clamp(28px, 5vw, 44px);
  color: var(--text-bright);
  margin: 0 0 4px;
  text-shadow: var(--glow);
}
.hero-role {
  color: var(--green);
  font-size: clamp(15px, 2.4vw, 19px);
  margin-bottom: 18px;
  font-weight: 500;
}
.hero-tagline {
  color: var(--text);
  max-width: 640px;
  margin: 0 0 26px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------------- Buttons ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border-bright);
  background: transparent;
  color: var(--text-bright);
  transition: all .15s;
}
.btn:hover { border-color: var(--green); color: var(--green); box-shadow: var(--glow); }
.btn-primary {
  background: var(--green);
  border-color: var(--green);
  color: #04140c;
}
.btn-primary:hover { background: var(--cyan); border-color: var(--cyan); color: #04140c; }
.btn-ghost { border-color: var(--border); color: var(--text-dim); }
.btn-ghost:hover { color: var(--text-bright); border-color: var(--border-bright); }
.btn-sm { padding: 8px 14px; font-size: 12px; }

/* ---------------- Section scaffolding ---------------- */
.section { padding: 56px 0; border-top: 1px solid var(--border); position: relative; z-index: 1; }
.section:first-of-type { border-top: none; }
.section-heading {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 28px;
}
.section-heading .tag {
  color: var(--green-dim);
  font-size: 13px;
}
.section-heading h2 { font-size: 22px; margin: 0; }
.section-heading::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ---------------- About ---------------- */
.about-text p { margin: 0 0 16px; color: var(--text); }
.about-text p:last-child { margin-bottom: 0; }

/* ---------------- Skills ---------------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
}
.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
}
.skill-card h3 { font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--cyan); margin-bottom: 14px; }
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-size: 12.5px;
  padding: 5px 10px;
  border: 1px solid var(--border-bright);
  border-radius: 4px;
  color: var(--text);
  background: rgba(0,255,140,0.04);
}

/* ---------------- Timeline (experience) ---------------- */
.timeline { display: flex; flex-direction: column; gap: 22px; }
.timeline-item {
  position: relative;
  padding-left: 26px;
  border-left: 2px solid var(--border);
}
.timeline-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--green);
}
.timeline-item.ongoing::before { background: var(--green); box-shadow: 0 0 8px var(--green); }
.timeline-head { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 6px; }
.timeline-head h3 { font-size: 16px; margin: 0; color: var(--text-bright); }
.timeline-org { color: var(--green-dim); font-size: 13.5px; }
.timeline-date { color: var(--text-dim); font-size: 12.5px; margin-left: auto; white-space: nowrap; }
.badge-live {
  font-size: 10.5px;
  color: var(--green);
  border: 1px solid var(--green-dim);
  border-radius: 20px;
  padding: 2px 9px;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.timeline-desc { color: var(--text); margin: 0 0 10px; font-size: 14px; }
.timeline-list { margin: 0; padding-left: 18px; color: var(--text); font-size: 13.5px; }
.timeline-list li { margin-bottom: 4px; }

/* ---------------- Cards (certs / lists) ---------------- */
.simple-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(260px,1fr)); gap: 10px 18px; }
.simple-list li {
  color: var(--text);
  font-size: 13.5px;
  padding-left: 20px;
  position: relative;
}
.simple-list li::before {
  content: "›";
  position: absolute;
  left: 0;
  color: var(--green);
}

/* ---------------- Education / Contact grid ---------------- */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}
.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
}
.info-card h3 { font-size: 15px; color: var(--text-bright); margin-bottom: 6px; }
.info-card p { margin: 0; color: var(--text-dim); font-size: 13.5px; }
.info-card .accent { color: var(--green-dim); }

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}
.contact-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  transition: border-color .15s, transform .15s;
}
.contact-card:hover { border-color: var(--border-bright); transform: translateY(-2px); }
.contact-icon {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: rgba(0,255,140,0.08);
  color: var(--green);
  flex-shrink: 0;
}
.contact-meta .label { display: block; font-size: 11px; color: var(--text-dim); text-transform: uppercase; letter-spacing: .05em; }
.contact-meta .value { display: block; font-size: 13.5px; color: var(--text-bright); word-break: break-word; }

/* ---------------- Project / Article Cards ---------------- */
.page-hero { padding: 56px 0 12px; }
.page-hero .tag { color: var(--green-dim); font-size: 13px; }
.page-hero h1 { font-size: clamp(24px, 4vw, 32px); margin: 8px 0 10px; }
.page-hero p { color: var(--text-dim); max-width: 620px; margin: 0; }

.card-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }

.project-card, .article-card, .tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  transition: border-color .15s;
}
.project-card:hover, .tool-card:hover { border-color: var(--border-bright); }

.card-top-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-dim);
}
.card-top-bar .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green-dim); }

.card-body { padding: 26px 28px 28px; }
.card-body h2 { font-size: 19px; margin-bottom: 10px; }
.card-body .desc { color: var(--text); margin-bottom: 16px; }

.tech-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.tech-tags .tag { background: rgba(38,224,255,0.05); border-color: var(--border-bright); color: var(--cyan); }

.role-block {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 12px;
}
.role-block h4 { margin: 0 0 6px; font-size: 13px; color: var(--amber); }
.role-block p { margin: 0; font-size: 13.5px; color: var(--text); }

.feature-list { margin: 0 0 18px; padding-left: 18px; color: var(--text); font-size: 13.5px; }
.feature-list li { margin-bottom: 5px; }

blockquote.quote {
  border-left: 3px solid var(--green-dim);
  margin: 16px 0;
  padding: 10px 16px;
  color: var(--text-dim);
  font-style: italic;
  font-size: 13.5px;
  background: rgba(0,255,140,0.03);
}

.card-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 6px; }

/* Article specific */
.article-card .card-body { display: flex; flex-direction: column; }
.article-meta { display: flex; gap: 10px; align-items: center; margin-bottom: 10px; font-size: 12px; color: var(--text-dim); }
.article-meta .platform { color: var(--cyan); }

/* Tool specific */
.tool-modules { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px,1fr)); gap: 10px; margin-bottom: 20px; }
.module-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  color: var(--text);
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-alt);
}
.module-item .idx {
  color: var(--green);
  font-weight: 700;
  min-width: 18px;
}
.notice-box {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  border: 1px solid rgba(255,207,92,0.35);
  background: rgba(255,207,92,0.06);
  color: var(--amber);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 13px;
  margin-bottom: 20px;
}

/* ---------------- Code viewer ---------------- */
.code-window {
  background: #05070a;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin: 0 auto;
}
.code-scroll {
  max-height: 78vh;
  overflow: auto;
  padding: 18px 0;
}
.code-lines {
  margin: 0;
  padding: 0 20px 0 0;
  counter-reset: line;
  list-style: none;
}
.code-lines li {
  counter-increment: line;
  white-space: pre;
  font-size: 12.5px;
  color: #d4dedb;
  padding-left: 58px;
  position: relative;
  min-height: 19px;
  line-height: 19px;
}
.code-lines li::before {
  content: counter(line);
  position: absolute;
  left: 0;
  width: 44px;
  text-align: right;
  color: #3a4a48;
  padding-right: 10px;
  user-select: none;
}

/* ---------------- Footer ---------------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0 40px;
  position: relative;
  z-index: 1;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}
.footer-links { display: flex; gap: 18px; font-size: 13px; }
.footer-note { color: var(--text-dim); font-size: 12px; max-width: 520px; }
.footer-credit { color: var(--border-bright); font-size: 12px; }

/* ---------------- Responsive ---------------- */
@media (max-width: 820px) {
  .nav-links {
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 10px 20px 18px;
    display: none;
    gap: 2px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 6px; }
  .nav-burger { display: flex; }
  .term-body { padding: 24px 20px 28px; }
}

@media (max-width: 560px) {
  .container { padding: 0 16px; }
  .hero { padding: 40px 0 36px; }
  .section { padding: 40px 0; }
  .timeline-date { margin-left: 0; }
}