/* ---------- Base ---------- */
:root {
  --bg: #0b0d10;
  --bg-soft: #0f1217;
  --text: #e6ecf1;
  --muted: #a7b3bf;
  --accent: #0ea5e9; /* sky-500 */
  --accent-2: #8b5cf6; /* violet-500 */
  --glass: rgba(255,255,255,0.06);
  --border: rgba(255,255,255,0.12);
  --ring: rgba(14,165,233,0.5);
  --shadow: 0 10px 30px rgba(0,0,0,0.25);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  color: var(--text);
  background: radial-gradient(1200px 600px at 10% -10%, rgba(14,165,233,0.08), transparent),
              radial-gradient(900px 500px at 110% 10%, rgba(139,92,246,0.12), transparent),
              var(--bg);
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

.container { width: min(1100px, 92vw); margin-inline: auto; }
h1, h2, h3 { font-family: "Space Grotesk", Inter, sans-serif; line-height: 1.1; margin: 0 0 .6rem; }
h1 { font-size: clamp(2.2rem, 4vw, 4rem); }
h2 { font-size: clamp(1.6rem, 2.8vw, 2.4rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.3rem); }
p { color: var(--text); opacity: .92; }
a { color: var(--text); text-decoration: none; }
a:hover { color: white; }

/* ---------- Global Effects ---------- */
.bg-orb {
  position: fixed; inset: auto auto;
  width: 50vmax; height: 50vmax; border-radius: 50%;
  filter: blur(80px);
  opacity: .12; pointer-events: none; z-index: -2;
}
.orb-1 { top: -20vmax; left: -10vmax; background: radial-gradient(circle at 30% 30%, #0ea5e9, transparent 60%); }
.orb-2 { bottom: -25vmax; right: -15vmax; background: radial-gradient(circle at 70% 70%, #8b5cf6, transparent 60%); }

.grid-noise {
  position: fixed; inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.06) 1px, transparent 1px);
  background-size: 18px 18px;
  opacity: .2; pointer-events: none; z-index: -3;
}

/* ---------- Header ---------- */
.site-header { position: sticky; top: 0; z-index: 50; backdrop-filter: saturate(140%) blur(10px);
  background: linear-gradient(180deg, rgba(11,13,16,0.8), rgba(11,13,16,0.4));
  border-bottom: 1px solid var(--border); }
.nav { display: flex; align-items: center; justify-content: space-between; padding: .9rem 0; }
.brand { display: flex; align-items: center; gap: .6rem; }
.logo { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  font-weight: 800; color: white; box-shadow: 0 6px 18px rgba(14,165,233,0.35); }
.brand-name { font-weight: 700; letter-spacing: .5px; }
nav { display: none; gap: 1.2rem; }
nav a { color: var(--muted); font-weight: 500; }
nav a:hover { color: white; }
#theme-toggle { border: 1px solid var(--border); background: var(--bg-soft); color: var(--text);
  padding: .5rem .7rem; border-radius: 12px; cursor: pointer; display: inline-flex; gap: .3rem; align-items: center; }
#theme-toggle .sun { display: none; }
#theme-toggle .moon { display: inline; }
@media (min-width: 900px) { nav { display: flex; }}

/* ---------- Hero ---------- */
.hero { display: grid; grid-template-columns: 1.1fr .9fr; gap: 3rem; align-items: center; padding: clamp(2rem, 4vw, 4rem) 0; }
.hero .headline .hi { opacity: .8; font-weight: 300; font-size: .9em; }
.hero .headline .name { display: block; font-size: clamp(2.4rem, 5vw, 4.6rem);
  background: linear-gradient(90deg, #fff, #e2f3ff); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .typed { display: block; min-height: 1.2em; color: var(--muted); font-weight: 600; margin-top: .2rem; }
.kicker { margin: 1rem 0 1.2rem; max-width: 55ch; }

.cta-row { display: flex; gap: .8rem; flex-wrap: wrap; }
.btn { --_bg: var(--bg-soft); border: 1px solid var(--border); background: var(--_bg); color: var(--text);
  padding: .9rem 1.2rem; border-radius: 14px; font-weight: 800; letter-spacing: .3px;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease; box-shadow: var(--shadow); }
.btn.big { padding: 1rem 1.3rem; font-size: 1rem; }
.btn:hover { transform: translateY(-2px); box-shadow: 0 18px 40px rgba(14,165,233,0.15); }
.btn.primary { --_bg: linear-gradient(135deg, rgba(14,165,233,.18), rgba(139,92,246,.18)); border-color: var(--ring); }
.btn.ghost { background: transparent; border-style: dashed; }
.btn.tiny { padding: .5rem .7rem; font-weight: 700; border-radius: 10px; }

.stats { display: grid; grid-template-columns: repeat(3,1fr); gap: 1rem; margin-top: 1.4rem; }
.stat { background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
  border: 1px solid var(--border); border-radius: 16px; padding: 1rem; text-align: center; }
.stat .num { font-size: 1.7rem; font-weight: 900; display: block; }
.stat .label { color: var(--muted); font-size: .92rem; }

.hero-art { display: grid; place-items: center; }
.card3d { perspective: 1000px; transform-style: preserve-3d; }
.pfp-glass { border-radius: 22px; overflow: hidden; border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
  box-shadow: 0 30px 80px rgba(0,0,0,0.35); transform: rotateY(0deg) rotateX(0deg); transition: transform .15s ease; }
.pfp-glass img { display: block; width: min(370px, 78vw); height: auto; }
.badge-row { display: flex; gap: .6rem; margin-top: .7rem; justify-content: center; }
.badge { padding: .35rem .6rem; font-weight: 800; font-size: .8rem; border-radius: 999px;
  background: linear-gradient(135deg, rgba(14,165,233,0.3), rgba(139,92,246,0.3)); border: 1px solid var(--border); }

/* ---------- Sections ---------- */
.section { padding: clamp(2.2rem,4vw,4rem) 0; }
.section-head { margin-bottom: 1.2rem; }
.section-head p { color: var(--muted); }
.section-actions, .certs-actions { margin-top: 1rem; display: flex; gap: .8rem; flex-wrap: wrap; }

.glass { background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03)); border: 1px solid var(--border);
  border-radius: 18px; padding: 1rem; }

.about-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.about-card h3 { margin-bottom: .4rem; }

/* ---------- Timeline (Academics) ---------- */
.timeline { position: relative; margin-left: .5rem; }
.timeline::before { content: ""; position: absolute; left: .75rem; top: 0; bottom: 0; width: 2px; background: var(--border); }
.tl-item { position: relative; padding-left: 2rem; margin: 1rem 0; }
.dot { position: absolute; left: .4rem; top: .8rem; width: .8rem; height: .8rem; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); box-shadow: 0 0 0 4px rgba(14,165,233,0.15); }
.tl-card h3 { margin-bottom: .2rem; }

/* ---------- Certifications ---------- */
.certs-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1rem; }
.cert { margin: 0; position: relative; isolation: isolate; border-radius: 16px; overflow: hidden; border: 1px solid var(--border); box-shadow: var(--shadow); cursor: zoom-in; }
.cert img { width: 100%; height: 200px; object-fit: cover; display: block; transition: transform .4s ease; }
.cert:hover img { transform: scale(1.06); }
.cert figcaption { position: absolute; inset: auto 0 0 0; padding: .6rem .8rem;
  background: linear-gradient(180deg, transparent, rgba(0,0,0,0.6)); font-weight: 800; letter-spacing: .3px; }

/* Lightbox */
dialog#lightbox { width: min(1000px, 96vw); background: var(--bg); border: 1px solid var(--border); padding: 0; border-radius: 16px; }
#lightbox img { width: 100%; height: auto; display: block; border-radius: 16px; }
#lightbox::backdrop { background: rgba(0,0,0,.6); backdrop-filter: blur(4px); }
#lightbox .close { position: absolute; top: .4rem; right: .6rem; font-size: 1.8rem; line-height: 1; background: transparent; border: none; color: white; cursor: pointer; }

/* ---------- Skills ---------- */
.tags { display: flex; flex-wrap: wrap; gap: .6rem; }
.tag { border: 1px solid var(--border); color: var(--text); background: linear-gradient(135deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02));
  padding: .6rem .9rem; border-radius: 999px; font-weight: 900; cursor: pointer; transition: transform .1s ease, box-shadow .2s ease, background .2s ease; }
.tag:hover { transform: translateY(-1px); box-shadow: 0 12px 28px rgba(139,92,246,0.18); }
.tag.active { outline: 2px solid var(--ring); background: linear-gradient(135deg, rgba(14,165,233,0.16), rgba(139,92,246,0.16)); }

/* ---------- Projects ---------- */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1rem; }
.project-card { display: grid; grid-template-rows: auto 1fr; overflow: hidden; border: 1px solid var(--border); border-radius: 18px;
  background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03)); box-shadow: var(--shadow);
  transform-style: preserve-3d; perspective: 1000px; transition: transform .2s ease, box-shadow .2s ease; }
.project-card:hover { transform: translateY(-2px); box-shadow: 0 24px 60px rgba(14,165,233,0.18); }
.project-media img { display: block; width: 100%; height: 160px; object-fit: cover; }
.project-body { padding: .95rem; }
.stack { display: flex; gap: .4rem; flex-wrap: wrap; margin: .6rem 0; }
.stack span { border: 1px solid var(--border); border-radius: 999px; padding: .28rem .55rem; font-size: .78rem; color: var(--muted); }
.actions { display: flex; gap: .5rem; flex-wrap: wrap; }

/* ---------- Impact ---------- */
.impact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.impact-card h3 { margin-bottom: .3rem; }

/* ---------- Elsewhere / Links ---------- */
.link-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; }
.link-card { display: flex; gap: .8rem; align-items: center; padding: 1rem; }
.link-emoji { font-size: 1.6rem; }

/* ---------- Contact (Thicker) ---------- */
form.contact { }
form.contact .row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
form.contact input, form.contact textarea {
  width: 100%; padding: 1rem 1.1rem; border-radius: 14px; border: 2px solid var(--border); background: var(--bg-soft); color: var(--text);
  font-size: 1rem; font-weight: 700;
}
form.contact input:focus, form.contact textarea:focus { outline: none; border-color: var(--ring); box-shadow: 0 0 0 4px rgba(14,165,233,0.15); }
form.contact .form-msg { margin-top: .8rem; color: var(--muted); font-weight: 700; }
.contact-thick { padding: 1.2rem 1.2rem 1.4rem; box-shadow: 0 30px 70px rgba(14,165,233,0.08); }

/* ---------- Footer ---------- */
.site-footer { padding: 2rem 0 3rem; color: var(--muted); text-align: center; }

/* ---------- Scroll Reveal ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- Modals ---------- */
.modal { width: min(1100px, 96vw); border: 1px solid var(--border); background: var(--bg); color: var(--text); border-radius: 16px; padding: 0; }
.modal.wide { width: min(1300px, 98vw); }
.modal::backdrop { background: rgba(0,0,0,.6); backdrop-filter: blur(4px); }
.modal-head { display: flex; justify-content: space-between; align-items: center; padding: .9rem 1rem; border-bottom: 1px solid var(--border); }
.modal-head h3 { margin: 0; }
.modal-head .close { background: transparent; border: none; color: var(--text); font-size: 1.6rem; cursor: pointer; }
.modal-controls { display: flex; flex-wrap: wrap; gap: .6rem; padding: .8rem 1rem; border-bottom: 1px solid var(--border); }
.modal-controls input[type="search"], .modal-controls input[type="text"], .modal-controls select {
  padding: .6rem .8rem; border-radius: 10px; border: 1px solid var(--border); background: var(--bg-soft); color: var(--text);
}
.list-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: .9rem; padding: 1rem; }
.list-card { border: 1px solid var(--border); border-radius: 14px; padding: .8rem; background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03)); }
.list-card h4 { margin: 0 0 .3rem; }
.list-meta { font-size: .85rem; color: var(--muted); display: flex; gap: .6rem; flex-wrap: wrap; }
.list-actions { margin-top: .6rem; display: flex; gap: .5rem; }

/* Masonry for many certs */
.masonry { column-count: 1; column-gap: 1rem; padding: 1rem; }
@media (min-width: 600px) { .masonry { column-count: 2; } }
@media (min-width: 1000px) { .masonry { column-count: 3; } }
.masonry figure { break-inside: avoid; margin: 0 0 1rem; border: 1px solid var(--border); border-radius: 12px; overflow: hidden; background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03)); }
.masonry img { width: 100%; height: auto; display: block; }
.masonry figcaption { padding: .5rem .6rem; font-weight: 700; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
  form.contact .row { grid-template-columns: 1fr; }
}

/* ---------- Light Theme (improved) ---------- */
body.light {
  --bg: #f5f7fb;
  --bg-soft: #ffffff;
  --text: #0b0d10;
  --muted: #475569;
  --border: rgba(2, 6, 23, 0.1);
  --ring: rgba(14,165,233,0.35);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(14,165,233,0.12), transparent),
    radial-gradient(900px 500px at 110% 10%, rgba(139,92,246,0.14), transparent),
    var(--bg);
}
body.light .grid-noise { opacity: .08; }
body.light nav a { color: #334155; }
body.light nav a:hover { color: #0b0d10; }
body.light .logo { box-shadow: 0 6px 18px rgba(14,165,233,0.45); }
body.light .btn.primary { --_bg: linear-gradient(135deg, rgba(14,165,233,.22), rgba(139,92,246,.2)); }
body.light .btn.ghost { border-color: rgba(2,6,23,0.14); }
body.light .project-card, body.light .list-card, body.light .glass { background: linear-gradient(180deg, rgba(0,0,0,0.02), rgba(0,0,0,0.0)); }
body.light #theme-toggle .sun { display: inline; }
body.light #theme-toggle .moon { display: none; }