/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Variables ── */
:root {
  --bg: #0a0a0a;
  --surface: #141414;
  --surface-hover: #1a1a1a;
  --surface-2: #1e1e1e;
  --border: #262626;
  --border-subtle: #1e1e1e;
  --text: #e5e5e5;
  --text-muted: #a3a3a3;
  --text-dim: #737373;
  --accent: #3b82f6;
  --accent-dim: #1e3a5f;
  --green: #22c55e;
  --green-dim: #14532d;
  --purple: #a855f7;
  --purple-dim: #3b0764;
  --orange: #f97316;
  --orange-dim: #431407;
  --pink: #ec4899;
  --pink-dim: #500724;
  --cyan: #06b6d4;
  --cyan-dim: #083344;
  --yellow: #eab308;
  --yellow-dim: #422006;
  --red: #ef4444;
  --red-dim: #450a0a;
  --radius: 12px;
  --radius-sm: 8px;
}

/* ── Reset ── */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Nav ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10,10,10,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 2rem;
}
.nav-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; height: 60px;
}
.nav-brand {
  font-weight: 700; font-size: 1.1rem; color: var(--text);
  text-decoration: none; display: flex; align-items: center; gap: 0.5rem;
}
.nav-links { display: flex; gap: 0.25rem; }
.nav-links a {
  color: var(--text-muted); text-decoration: none; font-size: 0.875rem;
  font-weight: 500; padding: 0.4rem 0.75rem; border-radius: 6px; transition: all 0.15s;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); background: var(--surface); }
.nav-gh {
  color: var(--text-muted); text-decoration: none; font-size: 0.875rem;
  display: flex; align-items: center; gap: 0.4rem; transition: color 0.15s;
}
.nav-gh:hover { color: var(--text); }
.nav-gh svg { width: 20px; height: 20px; fill: currentColor; }

/* ── Shared ── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }
section { padding: 5rem 0; }
.section-header { text-align: center; margin-bottom: 3rem; }
.section-header h2 {
  font-size: 2rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 0.5rem;
}
.section-header p { color: var(--text-muted); font-size: 1.05rem; }
.divider { border: none; border-top: 1px solid var(--border-subtle); margin: 0; }
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.6rem 1.3rem; border-radius: var(--radius-sm);
  font-size: 0.875rem; font-weight: 600; text-decoration: none; transition: all 0.15s;
  border: 1px solid transparent;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #2563eb; }
.btn-ghost { color: var(--text-muted); border-color: var(--border); background: transparent; }
.btn-ghost:hover { color: var(--text); border-color: var(--text-dim); }

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border-subtle); padding: 2rem;
  text-align: center; color: var(--text-dim); font-size: 0.85rem;
}
footer a { color: var(--text-muted); text-decoration: none; }
footer a:hover { color: var(--text); }

/* ── Skills ── */
.tabs {
  display: flex; gap: 0.25rem; flex-wrap: wrap; justify-content: center; margin-bottom: 2rem;
}
.tab {
  padding: 0.4rem 0.9rem; border-radius: 100px; font-size: 0.8rem; font-weight: 500;
  cursor: pointer; border: 1px solid var(--border-subtle); background: var(--surface);
  color: var(--text-muted); transition: all 0.15s;
}
.tab:hover { color: var(--text); border-color: var(--border); }
.tab.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.search-wrap {
  max-width: 380px; margin: 0 auto 1.5rem; position: relative;
}
.search-wrap input {
  width: 100%; padding: 0.55rem 1rem 0.55rem 2.3rem; border-radius: 100px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  font-size: 0.85rem; font-family: 'Inter', sans-serif; outline: none; transition: border-color 0.15s;
}
.search-wrap input::placeholder { color: var(--text-dim); }
.search-wrap input:focus { border-color: var(--accent); }
.search-wrap svg {
  position: absolute; left: 0.8rem; top: 50%; transform: translateY(-50%);
  width: 15px; height: 15px; color: var(--text-dim);
}

.skills-grid, .skills-page-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 0.6rem;
}
.skill-card {
  background: var(--surface); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm); padding: 1rem 1.15rem; transition: all 0.15s;
  cursor: pointer;
}
.skill-card:hover { border-color: var(--border); background: var(--surface-hover); }
.skill-card.hidden { display: none; }
.skill-card-header { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.35rem; }
.skill-icon {
  width: 28px; height: 28px; border-radius: 6px;
  display: flex; align-items: center; justify-content: center; font-size: 0.85rem; flex-shrink: 0;
}
.skill-name {
  font-family: 'JetBrains Mono', monospace; font-size: 0.8rem; font-weight: 600;
}
.skill-desc { font-size: 0.8rem; color: var(--text-muted); line-height: 1.5; margin-bottom: 0.5rem; }
.skill-example {
  font-family: 'JetBrains Mono', monospace; font-size: 0.7rem; color: var(--text-dim);
  background: rgba(255,255,255,0.03); padding: 0.3rem 0.5rem; border-radius: 5px;
  border: 1px solid var(--border-subtle);
}
.skill-example::before { content: '→ '; color: var(--accent); }
.cat-comm .skill-icon { background: var(--accent-dim); color: var(--accent); }
.cat-proj .skill-icon { background: var(--green-dim); color: var(--green); }
.cat-code .skill-icon { background: var(--purple-dim); color: var(--purple); }
.cat-data .skill-icon { background: var(--orange-dim); color: var(--orange); }
.cat-infra .skill-icon { background: var(--cyan-dim); color: var(--cyan); }
.cat-test .skill-icon { background: var(--pink-dim); color: var(--pink); }
.cat-prod .skill-icon { background: var(--yellow-dim); color: var(--yellow); }
.cat-adv .skill-icon  { background: var(--red-dim); color: var(--red); }

/* ── Memory ── */
.mem-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
.mem-card {
  background: var(--surface); border: 1px solid var(--border-subtle);
  border-radius: var(--radius); padding: 1.5rem;
}
.mem-card h3 {
  font-size: 0.95rem; font-weight: 600; margin-bottom: 0.75rem;
  display: flex; align-items: center; gap: 0.5rem;
}
.mem-card-full { grid-column: 1 / -1; }
.mem-card pre {
  font-family: 'JetBrains Mono', monospace; font-size: 0.75rem; line-height: 1.6;
  color: var(--text-muted); background: var(--bg); padding: 1rem;
  border-radius: var(--radius-sm); border: 1px solid var(--border-subtle); overflow-x: auto;
}
.mem-card code {
  font-family: 'JetBrains Mono', monospace; font-size: 0.78rem;
  background: rgba(255,255,255,0.05); padding: 0.12rem 0.35rem; border-radius: 4px;
}
.mem-card ul { list-style: none; padding: 0; }
.mem-card li {
  padding: 0.35rem 0; font-size: 0.85rem; color: var(--text-muted);
  display: flex; align-items: baseline; gap: 0.5rem;
}
.mem-card li::before {
  content: ''; width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent); flex-shrink: 0; margin-top: 0.4rem;
}
.cmd-table { width: 100%; border-collapse: collapse; font-size: 0.82rem; }
.cmd-table th {
  text-align: left; padding: 0.5rem 0.6rem; color: var(--text-dim);
  font-weight: 500; font-size: 0.7rem; text-transform: uppercase;
  letter-spacing: 0.06em; border-bottom: 1px solid var(--border-subtle);
}
.cmd-table td { padding: 0.4rem 0.6rem; border-bottom: 1px solid var(--border-subtle); }
.cmd-table td:first-child {
  font-family: 'JetBrains Mono', monospace; font-size: 0.78rem;
  color: var(--green); white-space: nowrap;
}
.cmd-table td:last-child { color: var(--text-muted); }
.cmd-table tr:last-child td { border-bottom: none; }

.type-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.4rem; }
.type-badge {
  background: rgba(255,255,255,0.03); border: 1px solid var(--border-subtle);
  border-radius: 6px; padding: 0.5rem 0.6rem;
}
.type-badge strong {
  display: block; font-size: 0.75rem; font-family: 'JetBrains Mono', monospace;
  color: var(--text); margin-bottom: 0.15rem;
}
.type-badge span { font-size: 0.7rem; color: var(--text-dim); }

.steps-row {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.75rem;
}
.step {
  background: var(--bg); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm); padding: 1.15rem; position: relative;
}
.step-num {
  width: 24px; height: 24px; border-radius: 50%; background: var(--accent-dim);
  color: var(--accent); display: flex; align-items: center; justify-content: center;
  font-size: 0.7rem; font-weight: 700; margin-bottom: 0.6rem;
}
.step h4 { font-size: 0.85rem; font-weight: 600; margin-bottom: 0.3rem; }
.step p { font-size: 0.78rem; color: var(--text-muted); line-height: 1.5; }

/* ── Sub-page Content ── */
.page-content {
  max-width: 800px; margin: 0 auto; padding: 7rem 2rem 4rem;
}
.back-link {
  display: inline-flex; align-items: center; gap: 0.4rem;
  color: var(--text-muted); text-decoration: none; font-size: 0.875rem;
  font-weight: 500; margin-bottom: 2rem; transition: color 0.15s;
}
.back-link::before {
  content: '←';
  font-size: 0.8em;
  line-height: 1;
}
.back-link:hover { color: var(--text); }

.page-content h1 {
  font-size: 2.5rem; font-weight: 800; letter-spacing: -0.03em; margin-bottom: 0.5rem;
  background: linear-gradient(135deg, #fff 0%, #a3a3a3 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.page-content h2 {
  font-size: 1.5rem; font-weight: 700; margin-top: 3rem; margin-bottom: 1rem;
  padding-bottom: 0.5rem; border-bottom: 1px solid var(--border-subtle);
}
.page-content h3 {
  font-size: 1.15rem; font-weight: 600; margin-top: 2rem; margin-bottom: 0.75rem;
}
.page-content h4 {
  font-size: 1rem; font-weight: 600; margin-top: 1.5rem; margin-bottom: 0.5rem;
}
.page-content p {
  color: var(--text-muted); line-height: 1.8; margin-bottom: 1rem;
}
.page-content a {
  color: var(--accent); text-decoration: none;
}
.page-content a:hover { text-decoration: underline; }
.page-content strong {
  color: var(--text); font-weight: 600;
}
.page-content em {
  color: var(--text-muted); font-style: italic;
}
.page-content ul, .page-content ol {
  padding-left: 1.5rem; margin-bottom: 1rem; color: var(--text-muted);
}
.page-content li {
  margin-bottom: 0.4rem; line-height: 1.7;
}
.page-content blockquote {
  border-left: 3px solid var(--accent); padding: 0.75rem 1.25rem; margin: 1.5rem 0;
  background: var(--surface); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic; color: var(--text-muted);
}
.page-content pre {
  font-family: 'JetBrains Mono', monospace; font-size: 0.8rem; line-height: 1.6;
  color: var(--text-muted); background: var(--surface); padding: 1.25rem;
  border-radius: var(--radius-sm); border: 1px solid var(--border-subtle);
  overflow-x: auto; margin: 1.5rem 0;
}
.page-content code {
  font-family: 'JetBrains Mono', monospace; font-size: 0.82rem;
  background: rgba(255,255,255,0.06); padding: 0.15rem 0.4rem; border-radius: 4px;
}
.page-content pre code {
  background: none; padding: 0; font-size: inherit;
}
.page-content table {
  width: 100%; border-collapse: collapse; font-size: 0.85rem; margin: 1.5rem 0;
}
.page-content th {
  text-align: left; padding: 0.6rem 0.75rem; color: var(--text-dim);
  font-weight: 500; font-size: 0.75rem; text-transform: uppercase;
  letter-spacing: 0.05em; border-bottom: 2px solid var(--border);
}
.page-content td {
  padding: 0.5rem 0.75rem; border-bottom: 1px solid var(--border-subtle);
  color: var(--text-muted);
}
.page-content td:first-child {
  font-family: 'JetBrains Mono', monospace; font-size: 0.8rem; color: var(--green);
}
.page-content hr {
  border: none; border-top: 1px solid var(--border-subtle); margin: 2.5rem 0;
}
.page-content img {
  max-width: 100%; border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle); margin: 1.5rem 0;
}
.page-content figure {
  margin: 2rem 0;
}
.image-modal-trigger {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  margin: 0;
  border: 0;
  background: transparent;
  cursor: zoom-in;
  overflow: hidden;
  border-radius: var(--radius-sm);
}
.image-modal-trigger::after {
  content: 'Expand';
  position: absolute;
  right: 0.9rem;
  bottom: 0.9rem;
  padding: 0.35rem 0.6rem;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  background: rgba(10, 10, 10, 0.72);
  color: #f8fafc;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.03em;
  pointer-events: none;
  opacity: 0.9;
  transition: transform 0.18s ease, opacity 0.18s ease, background 0.18s ease;
}
.image-modal-trigger:hover::after {
  transform: translateY(-1px);
  opacity: 1;
  background: rgba(15, 23, 42, 0.86);
}
.image-modal-trigger:focus-visible {
  outline: 2px solid rgba(96, 165, 250, 0.9);
  outline-offset: 6px;
  border-radius: var(--radius-sm);
}
.page-content figure img {
  display: block;
  width: 100%;
  margin: 0;
}
body.image-modal-open {
  overflow: hidden;
}
.image-modal[hidden] {
  display: none;
}
.image-modal {
  position: fixed;
  inset: 0;
  z-index: 1200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
  background: rgba(3, 7, 18, 0.76);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}
.image-modal-content {
  position: relative;
  margin: 0;
  padding: 1rem 1rem 1.1rem;
  max-width: min(1440px, calc(100vw - 2.5rem));
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 20px;
  background: rgba(10, 10, 10, 0.78);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
}
.image-modal-close {
  position: absolute;
  top: 0.9rem;
  right: 0.9rem;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: rgba(10, 10, 10, 0.78);
  color: #f8fafc;
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
}
.image-modal-close:hover {
  background: rgba(20, 20, 20, 0.92);
}
.image-modal img {
  display: block;
  max-width: min(1400px, calc(100vw - 4rem));
  max-height: calc(100vh - 5rem);
  width: auto;
  height: auto;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: #0b0f17;
}
.image-modal figcaption {
  margin-top: 0.75rem;
  text-align: center;
  color: #cbd5e1;
}
.page-content figcaption {
  margin-top: 0.75rem;
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.6;
}
.terminal-callout {
  margin: 1.5rem 0 1.75rem;
  border: 1px solid #2f3a4d;
  border-radius: 14px;
  overflow: hidden;
  background: linear-gradient(180deg, #111827 0%, #0b1220 100%);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.28);
}
.terminal-callout-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(147, 197, 253, 0.12);
}
.terminal-dots {
  display: inline-flex;
  gap: 0.4rem;
}
.terminal-dots span {
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 999px;
  display: block;
}
.terminal-dots span:nth-child(1) { background: #fb7185; }
.terminal-dots span:nth-child(2) { background: #fbbf24; }
.terminal-dots span:nth-child(3) { background: #34d399; }
.terminal-callout-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #bfdbfe;
}
.terminal-callout pre {
  margin: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  padding: 1rem 1.1rem 1.15rem;
}
.terminal-callout code {
  background: transparent;
  padding: 0;
  color: #e5e7eb;
}
.terminal-callout .prompt-sign {
  color: #34d399;
  margin-right: 0.5rem;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .skills-grid, .skills-page-grid { grid-template-columns: 1fr; }
  .mem-grid { grid-template-columns: 1fr; }
  .type-grid { grid-template-columns: 1fr 1fr; }
  .steps-row { grid-template-columns: 1fr 1fr; }
  .image-modal {
    padding: 0.75rem;
  }
  .image-modal img {
    max-width: calc(100vw - 2rem);
    max-height: calc(100vh - 4rem);
  }
}