/* ============================================================
   HDS.SYS — Portfolio Stylesheet
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  --bg:        #0d0d0d;
  --bg2:       #111111;
  --bg3:       #181818;
  --bg4:       #1e1e1e;
  --border:    #2a2a2a;
  --border2:   #333333;
  --text:      #e8e8e8;
  --text2:     #999999;
  --text3:     #666666;
  --blue:      #4d8ef0;
  --blue-dim:  #2563c4;
  --green:     #4ade80;
  --yellow:     #eab308;
  --mono:      'JetBrains Mono', monospace;
  --sans:      'Inter', sans-serif;
  --nav-h:     56px;
}

/* LIGHT MODE */
html.light {
  --bg:        #f5f5f5;
  --bg2:       #ffffff;
  --bg3:       #f0f0f0;
  --bg4:       #e9e9e9;

  --border:    #d0d0d0;
  --border2:   #bdbdbd;

  --text:      #111111;
  --text2:     #444444;
  --text3:     #777777;

  --blue:      #2563eb;
  --blue-dim:  #1d4ed8;
  --green:     #16a34a;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.65;
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ── NAV ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: var(--bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  z-index: 1000;
}

.nav-logo {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.nav-logo span.blue { color: var(--blue); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 13px;
  color: var(--text2);
  transition: color .2s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--text); }

.nav-theme {
  background: none;
  border: none;
  color: var(--text2);
  cursor: pointer;
  font-size: 18px;
  padding: 4px;
  transition: color .2s;
}
.nav-theme:hover { color: var(--text); }

/* ── MAIN WRAPPER ── */
main {
  padding-top: var(--nav-h);
  min-height: 100vh;
}

/* ── SECTION LABEL ── */
.section-label {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--blue);
  letter-spacing: 0.08em;
  margin-bottom: 32px;
}

/* ── CARD BASE ── */
.card {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: border-color .2s, background .2s;
}
.card:hover { border-color: var(--border2); }

/* ── TAG PILLS ── */
.tag {
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid var(--border2);
  border-radius: 5px;
  font-size: 12px;
  color: var(--text2);
  background: var(--bg4);
}

/* ── BUTTON ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--blue);
  color: #fff;
  padding: 10px 20px;
  border-radius: 7px;
  font-size: 14px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: background .2s, transform .15s;
  text-decoration: none;
}
.btn-primary:hover { background: var(--blue-dim); transform: translateY(-1px); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--text);
  padding: 10px 20px;
  border-radius: 7px;
  font-size: 14px;
  font-weight: 500;
  border: 1px solid var(--border2);
  cursor: pointer;
  transition: border-color .2s, background .2s, transform .15s;
  text-decoration: none;
}
.btn-secondary:hover { border-color: var(--text3); background: var(--bg3); transform: translateY(-1px); }

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--border);
  padding: 20px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text3);
  font-size: 12px;
  font-family: var(--mono);
}

footer span.blue { color: var(--blue); }

/* ── MODAL ── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-overlay.open { display: flex; }

.modal-box {
  background: var(--bg3);
  border: 1px solid var(--border2);
  border-radius: 12px;
  max-width: 860px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  animation: modalIn .2s ease;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(.96) translateY(12px); }
  to   { opacity: 1; transform: scale(1)  translateY(0); }
}

.modal-close {
  position: absolute;
  top: 14px; right: 16px;
  background: none;
  border: none;
  color: var(--text2);
  font-size: 22px;
  cursor: pointer;
  line-height: 1;
  z-index: 10;
  transition: color .2s;
}
.modal-close:hover { color: var(--text); }

/* ── BULLET LIST ── */
.bullet-list { list-style: none; display: flex; flex-direction: column; gap: 6px; }
.bullet-list li {
  font-size: 13px;
  color: var(--text2);
  padding-left: 20px;
  position: relative;
}
.bullet-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--text3);
  font-size: 11px;
}

/* ── ANIMATIONS ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fadeUp .5s ease both; }
.fade-up-d1 { animation-delay: .1s; }
.fade-up-d2 { animation-delay: .2s; }
.fade-up-d3 { animation-delay: .3s; }
.fade-up-d4 { animation-delay: .4s; }
.fade-up-d5 { animation-delay: .5s; }
.fade-up-d6 { animation-delay: .6s; }
.fade-up-d7 { animation-delay: .7s; }
.fade-up-d8 { animation-delay: .8s; }
.fade-up-d9 { animation-delay: .9s; }
.fade-up-d10 { animation-delay: 10s; }

/* ── SCROLLBAR ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }