style.css

/* ============================================================
   Erdoğan Başer — Portfolio
   Pure CSS — liquid glass theme, dark palette.
   The only animated element on the page is the background
   solar system (canvas); all other elements are static.
   ============================================================ */

:root {
  --bg: #07080f;
  --glass: linear-gradient(150deg, rgba(255, 255, 255, 0.09), rgba(255, 255, 255, 0.025));
  --glass-strong: linear-gradient(150deg, rgba(255, 255, 255, 0.13), rgba(255, 255, 255, 0.04));
  --border: rgba(255, 255, 255, 0.12);
  --border-strong: rgba(255, 255, 255, 0.22);
  --highlight: rgba(255, 255, 255, 0.16);
  --text: #e8eaf6;
  --text-dim: #9aa0b8;
  --accent-1: #7c5cff;
  --accent-2: #00d4ff;
  --grad: linear-gradient(120deg, var(--accent-1), var(--accent-2));
  --radius: 22px;
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --nav-h: 76px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--accent-1); color: #fff; }

.container { width: min(1120px, 92%); margin-inline: auto; }

h1, h2, h3 { font-family: var(--font-display); line-height: 1.15; }

/* ---------- Background canvas ---------- */
#scene {
  position: fixed; inset: 0; z-index: -1;
  width: 100%; height: 100%;
  display: block; pointer-events: none;
}

/* ---------- Liquid glass base ---------- */
.glass {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(22px) saturate(160%);
  -webkit-backdrop-filter: blur(22px) saturate(160%);
  box-shadow:
    inset 0 1px 0 var(--highlight),
    inset 0 0 0 0.5px rgba(255, 255, 255, 0.05),
    0 12px 40px rgba(0, 0, 0, 0.35);
}
.glass:hover { border-color: var(--border-strong); background: var(--glass-strong); }

/* ---------- Navigation ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: linear-gradient(180deg, rgba(10, 12, 22, 0.75), rgba(10, 12, 22, 0.6));
  backdrop-filter: blur(22px) saturate(160%);
  -webkit-backdrop-filter: blur(22px) saturate(160%);
  border-bottom-color: var(--border);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
.nav-inner {
  width: min(1120px, 92%); margin-inline: auto;
  height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.logo { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--text); min-width: 0; }
.logo-mark {
  width: 38px; height: 38px; flex: 0 0 auto; display: grid; place-items: center;
  font-family: var(--font-display); font-weight: 700; font-size: 0.95rem;
  background: var(--grad); border-radius: 11px; color: #fff;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35), 0 4px 18px rgba(124, 92, 255, 0.4);
}
.logo-text {
  font-family: var(--font-display); font-weight: 600; font-size: 1.05rem;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a {
  color: var(--text-dim); text-decoration: none; font-size: 0.94rem; font-weight: 500;
}
.nav-links a:hover { color: var(--text); }

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

.lang-toggle {
  display: flex; padding: 3px; border-radius: 999px;
  background: var(--glass);
  border: 1px solid var(--border);
  backdrop-filter: blur(22px) saturate(160%);
  -webkit-backdrop-filter: blur(22px) saturate(160%);
  box-shadow: inset 0 1px 0 var(--highlight);
}
.lang-btn {
  border: 0; cursor: pointer; background: transparent;
  color: var(--text-dim);
  font-family: var(--font-display); font-weight: 600; font-size: 0.8rem;
  padding: 5px 13px; border-radius: 999px;
}
.lang-btn.active {
  color: #fff; background: var(--grad);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span {
  display: block; width: 24px; height: 2px; background: var(--text);
  margin: 5px 0; border-radius: 2px;
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100svh;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  padding: calc(var(--nav-h) + 40px) 0 80px;
}
.hero-kicker {
  color: var(--accent-2); font-family: var(--font-display);
  letter-spacing: 0.25em; text-transform: uppercase; font-size: 0.85rem;
  margin-bottom: 18px;
}
.hero-name {
  font-size: clamp(2.6rem, 8vw, 5.2rem);
  font-weight: 700; letter-spacing: -0.02em; margin-bottom: 16px;
}
.grad {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.hero-role {
  font-family: var(--font-display); font-size: clamp(1.05rem, 2.6vw, 1.4rem);
  color: var(--text-dim); margin-bottom: 20px;
  max-width: 640px; margin-inline: auto;
}
.hero-desc {
  max-width: 560px; margin: 0 auto 34px; color: var(--text-dim); font-size: 1.02rem;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 34px; }

.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 13px 28px; border-radius: 999px;
  font-family: var(--font-display); font-weight: 600; font-size: 0.96rem;
  text-decoration: none;
}
.btn-primary {
  background: var(--grad); color: #fff;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3), 0 6px 24px rgba(124, 92, 255, 0.35);
}
.btn-primary:hover { box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4), 0 8px 30px rgba(124, 92, 255, 0.5); }
.btn-ghost {
  color: var(--text);
  background: var(--glass);
  border: 1px solid var(--border);
  backdrop-filter: blur(22px) saturate(160%);
  -webkit-backdrop-filter: blur(22px) saturate(160%);
  box-shadow: inset 0 1px 0 var(--highlight);
}
.btn-ghost:hover { border-color: var(--border-strong); background: var(--glass-strong); }
.btn-lg { padding: 16px 32px; font-size: 1.02rem; }

.hero-meta {
  display: flex; align-items: center; justify-content: center; gap: 16px;
  color: var(--text-dim); font-size: 0.92rem; flex-wrap: wrap;
}
.meta-sep { width: 4px; height: 4px; border-radius: 50%; background: var(--text-dim); }
.meta-item { display: inline-flex; align-items: center; gap: 8px; }
.status-dot {
  width: 9px; height: 9px; border-radius: 50%; background: #3ddc84;
  box-shadow: 0 0 8px rgba(61, 220, 132, 0.6);
}

/* ---------- Sections ---------- */
.section { padding: 105px 0; }
.section-head { margin-bottom: 52px; }
.section-tag {
  display: inline-block; font-family: var(--font-display);
  color: var(--accent-2); letter-spacing: 0.2em; text-transform: uppercase;
  font-size: 0.78rem; margin-bottom: 14px;
}
.section-head h2 { font-size: clamp(1.7rem, 4.5vw, 2.5rem); font-weight: 700; letter-spacing: -0.01em; }

/* ---------- About ---------- */
.about-grid {
  display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: start;
}
.about-text p { color: var(--text-dim); margin-bottom: 18px; font-size: 1.02rem; }
.about-text strong { color: var(--text); font-weight: 600; }

.about-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.stat-card { padding: 26px 18px; text-align: center; }
.stat-num {
  display: block; font-family: var(--font-display); font-size: 2.3rem; font-weight: 700;
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat-label { color: var(--text-dim); font-size: 0.85rem; }

/* ---------- Experience / timeline ---------- */
.timeline { position: relative; max-width: 780px; margin-inline: auto; padding-left: 36px; }
.timeline::before {
  content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px;
  background: linear-gradient(to bottom, var(--accent-1), var(--accent-2), transparent);
  opacity: 0.45;
}
.tl-item { position: relative; margin-bottom: 26px; }
.tl-item:last-child { margin-bottom: 0; }
.tl-dot {
  position: absolute; left: -36px; top: 28px;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--bg); border: 3px solid var(--accent-1);
}
.tl-dot.current {
  border-color: var(--accent-2);
  box-shadow: 0 0 0 5px rgba(0, 212, 255, 0.14), 0 0 16px rgba(0, 212, 255, 0.45);
}
.tl-card { padding: 26px 30px; }
.tl-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.tl-card h3 { font-size: 1.16rem; font-weight: 600; }
.tl-badge {
  font-size: 0.7rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase;
  padding: 4px 12px; border-radius: 999px;
}
.tl-badge.live {
  color: #3ddc84; background: rgba(61, 220, 132, 0.1); border: 1px solid rgba(61, 220, 132, 0.35);
}
.tl-role { color: var(--accent-2); font-weight: 500; font-size: 0.95rem; margin-top: 4px; }
.tl-date { color: var(--text-dim); font-size: 0.84rem; margin: 4px 0 10px; }
.tl-desc { color: var(--text-dim); font-size: 0.94rem; }

/* ---------- Education ---------- */
.edu-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.edu-card { padding: 34px 30px; }
.edu-card h3 { font-size: 1.18rem; margin-bottom: 8px; }
.edu-degree { color: var(--accent-2); font-size: 0.95rem; font-weight: 500; }
.edu-date { color: var(--text-dim); font-size: 0.87rem; margin-top: 4px; }

/* ---------- Skills ---------- */
.skills-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.skill-panel { padding: 30px; }
.skill-panel h3 { font-size: 1.06rem; margin-bottom: 20px; }

.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  padding: 8px 16px; border-radius: 999px; font-size: 0.87rem; font-weight: 500;
  color: var(--text);
  background: rgba(124, 92, 255, 0.12);
  border: 1px solid rgba(124, 92, 255, 0.35);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.lang-list { display: flex; flex-direction: column; gap: 16px; }
.lang-head {
  display: flex; justify-content: space-between; font-size: 0.9rem; margin-bottom: 7px;
}
.lang-head span:last-child { color: var(--text-dim); font-size: 0.82rem; }
.bar {
  height: 7px; border-radius: 99px; background: rgba(255, 255, 255, 0.07); overflow: hidden;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.3);
}
.bar-fill {
  display: block; height: 100%; border-radius: 99px;
  background: var(--grad);
}

.cert-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.cert-list li {
  position: relative; padding-left: 24px; color: var(--text-dim); font-size: 0.95rem;
}
.cert-list li::before {
  content: ""; position: absolute; left: 0; top: 0.6em;
  width: 8px; height: 8px; border-radius: 2px;
  background: var(--grad);
}

.skill-panel.award {
  background: linear-gradient(140deg, rgba(124, 92, 255, 0.16), rgba(0, 212, 255, 0.07));
  border-color: rgba(124, 92, 255, 0.4);
}
.award-title { font-family: var(--font-display); font-weight: 600; font-size: 1.04rem; margin-bottom: 6px; }
.award-desc { color: var(--text-dim); font-size: 0.94rem; }

/* ---------- Contact ---------- */
.contact-card {
  text-align: center;
  padding: 72px 32px;
  border-radius: 30px;
  background: linear-gradient(160deg, rgba(124, 92, 255, 0.14), rgba(255, 255, 255, 0.03) 45%, rgba(0, 212, 255, 0.08));
  border: 1px solid rgba(124, 92, 255, 0.35);
}
.contact-card h2 { font-size: clamp(1.7rem, 4.5vw, 2.5rem); margin: 12px 0 14px; }
.contact-card p { color: var(--text-dim); max-width: 480px; margin: 0 auto 34px; }
.contact-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); padding: 28px 0; }
.footer-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}
.footer p { color: var(--text-dim); font-size: 0.87rem; }
.back-top {
  width: 42px; height: 42px; display: grid; place-items: center;
  border-radius: 12px; text-decoration: none; color: var(--text);
  background: var(--glass); border: 1px solid var(--border);
  box-shadow: inset 0 1px 0 var(--highlight);
}
.back-top:hover { border-color: var(--border-strong); }

/* ---------- Tools page ---------- */
.hero-sub { min-height: 64svh; padding-bottom: 48px; }

.tool-card { padding: 44px 40px; }
.tool-title { font-size: clamp(1.5rem, 4vw, 2.1rem); margin-bottom: 16px; }
.tool-badges { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 24px; }
.tool-card > p { color: var(--text-dim); margin-bottom: 14px; max-width: 72ch; font-size: 1.02rem; }
.tool-card > p:last-child { margin-bottom: 0; }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature-card { padding: 26px 24px; }
.feature-card h3 { font-size: 1rem; margin-bottom: 10px; }
.feature-card p { color: var(--text-dim); font-size: 0.92rem; }

.output-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; align-items: start; }
.output-card { padding: 26px 24px; }
.output-card h3 { font-size: 1rem; margin-bottom: 14px; }
.codeblock {
  overflow-x: auto;
  background: rgba(0, 0, 0, 0.38);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 20px;
  font-family: "Cascadia Code", "Consolas", "SFMono-Regular", Menlo, monospace;
  font-size: 0.82rem;
  line-height: 1.65;
  color: #c9d4f2;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.faq-card { padding: 26px 24px; }
.faq-card h3 { font-size: 1rem; margin-bottom: 10px; }
.faq-card p { color: var(--text-dim); font-size: 0.93rem; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .skills-grid { grid-template-columns: 1fr; }
  .edu-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .output-grid { grid-template-columns: 1fr; }
  .faq-grid { grid-template-columns: 1fr; }
}

@media (max-width: 800px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; align-items: center; gap: 6px;
    background: linear-gradient(180deg, rgba(10, 12, 22, 0.94), rgba(10, 12, 22, 0.88));
    backdrop-filter: blur(24px) saturate(160%);
    -webkit-backdrop-filter: blur(24px) saturate(160%);
    border-bottom: 1px solid var(--border);
    padding: 18px 0 26px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 10px 0; font-size: 1.05rem; }
}

@media (max-width: 640px) {
  .section { padding: 76px 0; }
  .tl-card { padding: 22px 20px; }
  .tool-card { padding: 32px 24px; }
  .feature-grid { grid-template-columns: 1fr; }
  .contact-card { padding: 54px 22px; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .hero-actions .btn { width: 100%; max-width: 320px; justify-content: center; }
  .contact-actions .btn { width: 100%; max-width: 340px; justify-content: center; }
  .logo-text { font-size: 0.98rem; }
}

@media (max-width: 400px) {
  .about-stats { grid-template-columns: 1fr; }
}