/* Anjan Kunduru -- portfolio. Dark, security-professional. No framework. */

:root {
  --bg:        #0b0f14;
  --bg-2:      #11171f;
  --panel:     #131a23;
  --panel-2:   #172130;
  --border:    #23303d;
  --text:      #d8e0e8;
  --muted:     #8a99a8;
  --dim:       #5f6f7e;
  --accent:    #4be39a;   /* signal green */
  --accent-2:  #52b6ff;   /* cool blue */
  --danger:    #ff6b6b;
  --lock:      #f2c14e;   /* amber for locked/active */
  --radius:    12px;
  --maxw:      1080px;
  --mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* subtle grid backdrop */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(82,182,255,0.06), transparent 60%),
    radial-gradient(900px 500px at 0% 10%, rgba(75,227,154,0.05), transparent 55%),
    linear-gradient(var(--bg), var(--bg));
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* focus visibility for accessibility */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--accent); color: #05231a; padding: 10px 16px; border-radius: 0 0 8px 0;
  font-weight: 700; z-index: 100;
}
.skip-link:focus { left: 0; }

/* ---------- Nav ---------- */
header.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(11,15,20,0.72);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { font-family: var(--mono); font-weight: 700; letter-spacing: .02em; color: var(--text); }
.brand .accent { color: var(--accent); }
.nav-links { display: flex; gap: 22px; }
.nav-links a { color: var(--muted); font-size: .93rem; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-toggle { display: none; background: none; border: 0; color: var(--text); font-size: 1.5rem; cursor: pointer; }

@media (max-width: 720px) {
  .nav-links {
    position: absolute; top: 60px; right: 0; left: 0;
    flex-direction: column; gap: 0;
    background: var(--bg-2); border-bottom: 1px solid var(--border);
    max-height: 0; overflow: hidden; transition: max-height .25s ease;
  }
  .nav-links.open { max-height: 340px; }
  .nav-links a { padding: 14px 20px; border-top: 1px solid var(--border); }
  .nav-toggle { display: block; }
}

/* ---------- Sections ---------- */
section { padding: 76px 0; border-bottom: 1px solid rgba(35,48,61,0.5); }
section:last-of-type { border-bottom: 0; }

.kicker {
  font-family: var(--mono); font-size: .8rem; letter-spacing: .18em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 10px;
}
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; }
h2.section-title { font-size: clamp(1.5rem, 3.4vw, 2.1rem); }
.section-lead { color: var(--muted); max-width: 60ch; margin: 0 0 34px; }

/* ---------- Hero ---------- */
.hero { padding: 96px 0 84px; border-bottom: 1px solid var(--border); }
.hero .kicker { color: var(--accent-2); }
.hero h1 { font-size: clamp(2.1rem, 6vw, 3.6rem); letter-spacing: -0.02em; }
.hero h1 .grad {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .tagline { font-size: clamp(1.05rem, 2.4vw, 1.3rem); color: var(--text); max-width: 62ch; margin: 6px 0 8px; }
.hero .subline { color: var(--muted); max-width: 60ch; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }

.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 12px 20px; border-radius: 10px; font-weight: 600; font-size: .95rem;
  border: 1px solid var(--border); cursor: pointer; transition: transform .12s ease, border-color .12s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: linear-gradient(90deg, var(--accent), #3fd0a0); color: #05231a; border-color: transparent; }
.btn-ghost { background: var(--panel); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent-2); }

.hero-meta { display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: 30px; color: var(--dim); font-family: var(--mono); font-size: .82rem; }
.hero-meta span::before { content: "▹ "; color: var(--accent); }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1.6fr 1fr; gap: 40px; }
@media (max-width: 800px) { .about-grid { grid-template-columns: 1fr; } }
.about p { color: var(--text); }
.facts { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.facts h3 { font-size: .95rem; color: var(--muted); font-family: var(--mono); text-transform: uppercase; letter-spacing: .1em; }
.facts ul { list-style: none; margin: 0; padding: 0; }
.facts li { display: flex; justify-content: space-between; gap: 12px; padding: 9px 0; border-top: 1px solid var(--border); font-size: .92rem; }
.facts li:first-child { border-top: 0; }
.facts li .k { color: var(--dim); }
.facts li .v { color: var(--text); text-align: right; }

/* ---------- Skills ---------- */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.skill-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.skill-card h3 { font-size: 1rem; display: flex; align-items: center; gap: 10px; }
.skill-card h3 .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 10px var(--accent); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.chip { font-family: var(--mono); font-size: .78rem; color: var(--muted); background: var(--panel-2); border: 1px solid var(--border); border-radius: 6px; padding: 4px 9px; }

/* ---------- Certs ---------- */
.cert-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; }
.cert { background: var(--panel); border: 1px solid var(--border); border-left: 3px solid var(--accent-2); border-radius: 10px; padding: 16px 18px; }
.cert .name { font-weight: 600; }
.cert .meta { color: var(--dim); font-size: .82rem; font-family: var(--mono); margin-top: 4px; }

/* ---------- Projects ---------- */
.project-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 18px; }
.project { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; display: flex; flex-direction: column; }
.project h3 { font-size: 1.12rem; }
.project .stack { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0 12px; }
.project .impact { margin-top: auto; padding-top: 14px; border-top: 1px solid var(--border); color: var(--accent); font-family: var(--mono); font-size: .85rem; }

.subgroup { font-family: var(--mono); font-size: .95rem; color: var(--text); margin: 34px 0 4px; letter-spacing: .01em; }
.subgroup:first-of-type { margin-top: 18px; }
.subgroup-lead { color: var(--muted); margin: 0 0 16px; max-width: 60ch; }
.project .repo-row { margin-top: auto; padding-top: 14px; border-top: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.project .repo-link { font-family: var(--mono); font-size: .85rem; color: var(--accent); }
.project .repo-link:hover { text-decoration: underline; }
.project .lang-tag { font-family: var(--mono); font-size: .72rem; color: var(--muted); border: 1px solid var(--border); border-radius: 6px; padding: 3px 8px; white-space: nowrap; }

/* ---------- Timeline ---------- */
.timeline { position: relative; margin-left: 8px; padding-left: 28px; border-left: 2px solid var(--border); }
.tl-item { position: relative; padding: 6px 0 26px; }
.tl-item::before { content: ""; position: absolute; left: -37px; top: 10px; width: 14px; height: 14px; border-radius: 50%; background: var(--bg); border: 3px solid var(--accent); }
.tl-item .when { font-family: var(--mono); font-size: .8rem; color: var(--dim); }
.tl-item h3 { margin: 4px 0 2px; font-size: 1.08rem; }
.tl-item .org { color: var(--accent-2); font-size: .95rem; }
.tl-item ul { color: var(--muted); margin: 10px 0 0; padding-left: 18px; }
.tl-item ul li { margin-bottom: 6px; }

/* ---------- HTB writeups ---------- */
.htb-head { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 16px; }
.htb-legend { display: flex; gap: 18px; font-size: .82rem; color: var(--muted); font-family: var(--mono); }
.htb-legend .swatch { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 6px; vertical-align: middle; }
.sw-open { background: var(--accent); }
.sw-lock { background: var(--lock); }

.policy-note {
  margin: 18px 0 26px; padding: 14px 18px; border-radius: 10px;
  background: rgba(242,193,78,0.07); border: 1px solid rgba(242,193,78,0.28);
  color: #e9d9ac; font-size: .9rem;
}
.policy-note strong { color: var(--lock); }

.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.wu-card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; position: relative; display: flex; flex-direction: column; gap: 10px;
  transition: border-color .15s ease, transform .12s ease;
}
.wu-card:hover { transform: translateY(-2px); }
.wu-card.locked { border-color: rgba(242,193,78,0.35); }
.wu-card.open { border-color: rgba(75,227,154,0.35); }
.wu-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.wu-name { font-weight: 700; font-size: 1.05rem; }
.wu-badge { font-family: var(--mono); font-size: .68rem; letter-spacing: .06em; text-transform: uppercase; padding: 3px 8px; border-radius: 20px; white-space: nowrap; }
.wu-badge.lock { background: rgba(242,193,78,0.14); color: var(--lock); border: 1px solid rgba(242,193,78,0.4); }
.wu-badge.open { background: rgba(75,227,154,0.14); color: var(--accent); border: 1px solid rgba(75,227,154,0.4); }
.wu-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.wu-tag { font-family: var(--mono); font-size: .74rem; color: var(--muted); background: var(--panel-2); border: 1px solid var(--border); border-radius: 6px; padding: 2px 8px; }
.wu-tag.os-linux { color: #ffd479; }
.wu-tag.os-windows { color: #7fb7ff; }
.wu-tag.diff-easy { color: #6ee7a8; }
.wu-tag.diff-medium { color: #f2c14e; }
.wu-tag.diff-hard, .wu-tag.diff-insane { color: #ff8f8f; }
.wu-note { color: var(--dim); font-size: .84rem; margin-top: auto; }
.wu-link { font-family: var(--mono); font-size: .82rem; }
.wu-solved { font-family: var(--mono); font-size: .75rem; color: var(--accent); }
.wu-solved::before { content: "✓ "; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-top: 10px; }
.contact-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.contact-card .label { font-family: var(--mono); font-size: .74rem; text-transform: uppercase; letter-spacing: .1em; color: var(--dim); }
.contact-card .val { margin-top: 6px; word-break: break-word; }

/* ---------- Footer ---------- */
footer.site { padding: 40px 0; color: var(--dim); font-size: .84rem; text-align: center; }
footer.site .mono { font-family: var(--mono); }

/* noscript / empty states */
.empty { color: var(--dim); font-family: var(--mono); font-size: .9rem; padding: 20px; border: 1px dashed var(--border); border-radius: 10px; }