/* ------------------------------
   Global Theme & Resets
---------------------------------*/
:root {
  --bg: #0f1226;
  --surface: #161a39;
  --card: #1b2047;
  --text: #eef1ff;
  --muted: #b8bce0;
  --accent: #7c5cff;      /* primary accent */
  --accent-2: #34d399;    /* secondary accent (green) */
  --ring: rgba(124, 92, 255, 0.5);
  --shadow: 0 10px 30px rgba(0,0,0,0.25);
  --radius: 16px;
  --radius-sm: 12px;
  --maxw: 1100px;
  --gap: 1.25rem;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f7fb;
    --surface: #ffffff;
    --card: #ffffff;
    --text: #15172b;
    --muted: #4b4f70;
    --accent: #5b4bff;
    --accent-2: #0ea5e9;
    --ring: rgba(91, 75, 255, 0.35);
    --shadow: 0 10px 25px rgba(17, 24, 39, 0.08);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Inter, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 100% -10%, rgba(124,92,255,0.20), transparent 55%),
    radial-gradient(900px 500px at -10% 0%, rgba(14,165,233,0.20), transparent 50%),
    linear-gradient(180deg, var(--bg), var(--bg));
}

/* Smooth focus rings for accessibility */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  box-shadow: 0 0 0 6px var(--ring);
  border-radius: 8px;
}

/* Utility containers */
main, header > nav, section, footer {
  width: min(100% - 2rem, var(--maxw));
  margin-inline: auto;
}

/* ------------------------------
   Header / Hero
---------------------------------*/
header {
  padding: 3.5rem 1rem 2rem;
  background:
    radial-gradient(900px 500px at 20% -10%, rgba(124,92,255,0.25), transparent 60%),
    radial-gradient(800px 500px at 90% 0%, rgba(52,211,153,0.18), transparent 60%),
    linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0));
  text-align: center;
}

header h1 {
  font-size: clamp(2rem, 3.2vw + 1rem, 3.2rem);
  margin: 0 0 .25rem;
  letter-spacing: .3px;
}

header p {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: clamp(1rem, .5vw + .9rem, 1.15rem);
}

/* Top nav */
header nav {
  display: inline-flex;
  gap: .5rem;
  padding: .5rem;
  background: color-mix(in oklab, var(--surface) 85%, transparent);
  border: 1px solid color-mix(in oklab, var(--accent) 25%, transparent);
  border-radius: 999px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

header nav a {
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  padding: .6rem 1rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  transition: transform .15s ease, background .2s ease, color .2s ease;
}

header nav a:hover {
  transform: translateY(-1px);
  background: color-mix(in oklab, var(--accent) 18%, transparent);
}

header nav a:active { transform: translateY(0); }

/* Resume pill: auto-detected if linking to .pdf */
header nav a[href$=".pdf"] {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: white;
}

/* ------------------------------
   Sections
---------------------------------*/
main { padding: 1.5rem 1rem 3rem; }

section {
  margin: 3rem 0;
  padding: 1.25rem;
  background: color-mix(in oklab, var(--surface) 90%, transparent);
  border: 1px solid color-mix(in oklab, var(--text) 12%, transparent);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

section h2 {
  margin: 0 0 1.25rem;
  font-size: clamp(1.4rem, 1.1vw + 1rem, 2rem);
  letter-spacing: .2px;
  position: relative;
}

section h2::after {
  content: "";
  display: block;
  width: 64px;
  height: 3px;
  margin-top: .5rem;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

/* ------------------------------
   Projects Grid + Cards
---------------------------------*/
/* Make #projects a responsive grid; H2 spans full width */
#projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--gap);
}
#projects > h2 { grid-column: 1 / -1; }

.project-card {
  background: linear-gradient(180deg, color-mix(in oklab, var(--card) 96%, transparent), color-mix(in oklab, var(--surface) 90%, transparent));
  border: 1px solid color-mix(in oklab, var(--text) 10%, transparent);
  border-radius: var(--radius);
  padding: 1rem;
  display: grid;
  gap: .75rem;
  align-content: start;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow);
  transform: translateY(0);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
  animation: fadeUp .6s ease both;
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in oklab, var(--accent) 35%, transparent);
  box-shadow: 0 16px 40px rgba(0,0,0,0.25);
}

.project-card::before {
  content: "";
  position: absolute;
  inset: -40% -40% auto auto;
  width: 220px; height: 220px;
  background: radial-gradient(circle at center, color-mix(in oklab, var(--accent) 35%, transparent), transparent 60%);
  opacity: .25;
  transform: rotate(25deg);
  pointer-events: none;
}

.project-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid color-mix(in oklab, var(--text) 12%, transparent);
}

.project-card h3 {
  margin: .25rem 0 0;
  font-size: 1.1rem;
}

.project-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

/* “View Code” link looks like a button */
.project-card a[target="_blank"] {
  justify-self: start;
  text-decoration: none;
  font-weight: 700;
  padding: .6rem .9rem;
  border-radius: 12px;
  border: 1px solid color-mix(in oklab, var(--accent) 40%, transparent);
  background: color-mix(in oklab, var(--accent) 22%, transparent);
  color: var(--text);
  transition: transform .15s ease, background .2s ease, border-color .2s ease;
}

.project-card a[target="_blank"]:hover {
  transform: translateY(-1px);
  background: color-mix(in oklab, var(--accent) 32%, transparent);
  border-color: color-mix(in oklab, var(--accent) 65%, transparent);
}

/* ------------------------------
   Skills
---------------------------------*/
#skills ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  padding: 0;
  margin: .5rem 0 0;
}

#skills li {
  padding: .5rem .75rem;
  border-radius: 999px;
  border: 1px solid color-mix(in oklab, var(--text) 12%, transparent);
  background: color-mix(in oklab, var(--surface) 88%, transparent);
  font-weight: 600;
  font-size: .95rem;
  color: var(--text);
}

/* ------------------------------
   Footer / Contact
---------------------------------*/
footer {
  margin: 2rem auto 3rem;
  padding: 1.25rem 1rem;
  background: color-mix(in oklab, var(--surface) 90%, transparent);
  border: 1px solid color-mix(in oklab, var(--text) 12%, transparent);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
}

footer a {
  color: var(--accent-2);
  text-decoration: none;
  font-weight: 700;
}
footer a:hover { text-decoration: underline; }

footer p {
  margin: .25rem 0;
  color: var(--muted);
}

/* ------------------------------
   Animations
---------------------------------*/
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(10px);
    filter: saturate(.8);
  }
  to {
    opacity: 1;
    transform: translateY(0);
    filter: saturate(1);
  }
}

/* ------------------------------
   Responsive tweaks
---------------------------------*/
@media (max-width: 640px) {
  header { padding: 2.5rem 1rem 1.25rem; }
  header nav { gap: .25rem; }
  header nav a { padding: .5rem .8rem; font-size: .95rem; }
  .project-card img { height: 160px; }
}

@media (min-width: 1100px) {
  header { padding-top: 4rem; }
}

/* ------------------------------
   Optional helpers (use if needed)
---------------------------------*/
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  text-decoration: none; font-weight: 700;
  padding: .65rem 1rem; border-radius: 12px;
  border: 1px solid color-mix(in oklab, var(--accent) 40%, transparent);
  background: color-mix(in oklab, var(--accent) 18%, transparent);
  color: var(--text);
  transition: transform .15s ease, background .2s ease, border-color .2s ease;
}
.btn:hover {
  transform: translateY(-1px);
  background: color-mix(in oklab, var(--accent) 30%, transparent);
  border-color: color-mix(in oklab, var(--accent) 65%, transparent);
}

/* ------------------------------
   Certifications
---------------------------------*/
#certifications .certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--gap);
}

.cert-card {
  background: linear-gradient(180deg,
    color-mix(in oklab, var(--card) 96%, transparent),
    color-mix(in oklab, var(--surface) 90%, transparent)
  );
  border: 1px solid color-mix(in oklab, var(--text) 10%, transparent);
  border-radius: var(--radius);
  padding: 1rem;
  display: grid;
  gap: .75rem;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
  animation: fadeUp .6s ease both;
}

.cert-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in oklab, var(--accent) 35%, transparent);
  box-shadow: 0 16px 40px rgba(0,0,0,0.25);
}

.cert-card::before {
  content: "";
  position: absolute;
  inset: -40% -40% auto auto;
  width: 220px; height: 220px;
  background: radial-gradient(circle at center,
    color-mix(in oklab, var(--accent) 35%, transparent),
    transparent 60%);
  opacity: .22;
  transform: rotate(20deg);
  pointer-events: none;
}

.cert-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: .75rem;
  align-items: center;
}

.cert-icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  border: 1px solid color-mix(in oklab, var(--text) 12%, transparent);
  background: color-mix(in oklab, var(--surface) 88%, transparent);
  font-size: 1.25rem;
}

.cert-card h3 {
  margin: 0;
  font-size: 1.05rem;
}

.issuer {
  margin: .15rem 0 0;
  color: var(--muted);
  font-weight: 600;
  font-size: .95rem;
}

.cert-desc {
  margin: .25rem 0 0;
  color: var(--muted);
  line-height: 1.55;
}

.cert-meta {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .75rem 1rem;
  padding: 0;
  margin: 0;
  color: var(--text);
}

.cert-meta li {
  padding: .4rem .6rem;
  border-radius: 999px;
  border: 1px solid color-mix(in oklab, var(--text) 12%, transparent);
  background: color-mix(in oklab, var(--surface) 88%, transparent);
  font-weight: 600;
  font-size: .9rem;
}

.verify-btn {
  justify-self: start;
  text-decoration: none;
  font-weight: 700;
  padding: .6rem .9rem;
  border-radius: 12px;
  border: 1px solid color-mix(in oklab, var(--accent) 40%, transparent);
  background: color-mix(in oklab, var(--accent) 22%, transparent);
  color: var(--text);
  transition: transform .15s ease, background .2s ease, border-color .2s ease;
}

.verify-btn:hover {
  transform: translateY(-1px);
  background: color-mix(in oklab, var(--accent) 32%, transparent);
  border-color: color-mix(in oklab, var(--accent) 65%, transparent);
}

/* Small screens */
@media (max-width: 640px) {
  .cert-icon { width: 40px; height: 40px; font-size: 1.1rem; }
  .cert-card h3 { font-size: 1rem; }
}

/* Current section highlight in top nav */
header nav a.active {
  background: color-mix(in oklab, var(--accent) 28%, transparent);
  box-shadow: 0 0 0 3px var(--ring) inset;
}