/* ==========================================================================
   Dhananjay Dogra — Portfolio
   Plain CSS, no frameworks. Light/dark via CSS variables.
   ========================================================================== */

:root {
  --bg: #f8f9fb;
  --bg-alt: #eef1f6;
  --surface: #ffffff;
  --text: #1a2233;
  --text-muted: #5a6577;
  --accent: #0f62fe;
  --accent-soft: #e3ecff;
  --accent-contrast: #ffffff;
  --border: #dde3ec;
  --shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 8px 24px rgba(16, 24, 40, .06);
  --radius: 12px;
  --maxw: 1080px;
}

[data-theme="dark"] {
  --bg: #0d1220;
  --bg-alt: #111828;
  --surface: #161f33;
  --text: #e8ecf4;
  --text-muted: #9aa6bb;
  --accent: #6ea8ff;
  --accent-soft: #1b2a4a;
  --accent-contrast: #0d1220;
  --border: #263149;
  --shadow: 0 1px 3px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .35);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background .25s ease, color .25s ease;
}

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 1.25rem; }

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

h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; }

img { max-width: 100%; }

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav { display: flex; align-items: center; justify-content: space-between; height: 60px; }

.brand { font-size: 1.35rem; font-weight: 800; color: var(--text); letter-spacing: -.5px; }
.brand:hover { text-decoration: none; }
.brand-dot { color: var(--accent); }

.nav-links { display: flex; align-items: center; gap: 1.35rem; list-style: none; }
.nav-links a { color: var(--text-muted); font-size: .92rem; font-weight: 500; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-links a.nav-cta {
  color: var(--accent); border: 1px solid var(--accent);
  padding: .3rem .85rem; border-radius: 999px;
}
.nav-links a.nav-cta:hover { background: var(--accent); color: var(--accent-contrast); }

.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  cursor: pointer;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: block; }
.icon-sun { display: none; }
.icon-moon { display: block; }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span {
  display: block; width: 22px; height: 2px; margin: 5px 0;
  background: var(--text); border-radius: 2px; transition: transform .2s ease, opacity .2s ease;
}

/* ---------- Hero ---------- */
.hero { padding: 5.5rem 1.25rem 4rem; text-align: left; }

.hero-kicker {
  display: inline-block; font-size: .85rem; font-weight: 600;
  color: var(--accent); background: var(--accent-soft);
  padding: .3rem .9rem; border-radius: 999px; margin-bottom: 1.25rem;
}

.hero h1 { font-size: clamp(2.4rem, 6vw, 3.6rem); letter-spacing: -1px; }

.hero-title { font-size: clamp(1.15rem, 3vw, 1.45rem); font-weight: 600; margin-top: .5rem; }
.hero-title .sep { color: var(--accent); }

.hero-sub { max-width: 640px; color: var(--text-muted); margin-top: 1rem; font-size: 1.05rem; }

.hero-actions { display: flex; gap: .8rem; margin-top: 1.75rem; flex-wrap: wrap; }

.hero-social { display: flex; gap: 1.25rem; list-style: none; margin-top: 1.75rem; }
.hero-social a { color: var(--text-muted); font-size: .92rem; font-weight: 500; }
.hero-social a:hover { color: var(--accent); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block; padding: .65rem 1.4rem; border-radius: 999px;
  font-weight: 600; font-size: .95rem; transition: all .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: var(--accent-contrast); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-outline { border: 1.5px solid var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { padding: .45rem 1rem; font-size: .88rem; margin-top: .75rem; }

/* ---------- Stats strip ---------- */
.stats { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1rem; padding: 2rem 1.25rem;
}
.stat { text-align: center; }
.stat-num { display: block; font-size: 2rem; font-weight: 800; color: var(--accent); }
.stat-label { font-size: .85rem; color: var(--text-muted); }

/* ---------- Sections ---------- */
.section { padding: 4.5rem 1.25rem; }
.section-alt { background: var(--bg-alt); }
.section-alt > .container { padding: 0; }

.section h2 {
  font-size: clamp(1.6rem, 4vw, 2.1rem); margin-bottom: 2rem; letter-spacing: -.5px;
}
.section-num {
  color: var(--accent); font-size: .95rem; font-weight: 700;
  vertical-align: middle; margin-right: .6rem;
}

.subheading { font-size: 1.1rem; margin: 2rem 0 1rem; color: var(--text); }
.subheading:first-of-type { margin-top: 0; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1.7fr 1fr; gap: 2.5rem; align-items: start; }
.about-text p + p { margin-top: 1rem; }
.about-text { color: var(--text-muted); }
.about-text strong { color: var(--text); }

.about-side { display: flex; flex-direction: column; gap: 1.25rem; }

.about-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem; box-shadow: var(--shadow);
}

.now-card { border: 1.5px solid var(--accent); }
.now-card li { line-height: 1.5; }
.now-dot {
  display: inline-block; width: 9px; height: 9px; border-radius: 50%;
  background: #2ebd6b; margin-left: .35rem; vertical-align: middle;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(46, 189, 107, .5); }
  50% { box-shadow: 0 0 0 6px rgba(46, 189, 107, 0); }
}
@media (prefers-reduced-motion: reduce) { .now-dot { animation: none; } }
.about-card h3 { font-size: 1rem; margin-bottom: .9rem; }
.about-card ul { list-style: none; }
.about-card li { font-size: .9rem; color: var(--text-muted); padding: .4rem 0; border-bottom: 1px solid var(--border); }
.about-card li:last-child { border-bottom: none; }
.about-card strong { color: var(--text); }

/* ---------- Timeline ---------- */
.timeline { display: flex; flex-direction: column; gap: 2rem; position: relative; }

.timeline-item {
  display: grid; grid-template-columns: 200px 1fr; gap: 1.5rem;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.75rem; box-shadow: var(--shadow);
}

.timeline-meta { display: flex; flex-direction: column; gap: .25rem; }
.timeline-date { font-weight: 700; font-size: .92rem; color: var(--accent); }
.timeline-loc { font-size: .85rem; color: var(--text-muted); }

.timeline-body h3 { font-size: 1.2rem; }
.timeline-org { color: var(--text-muted); font-size: .92rem; margin: .15rem 0 .8rem; }
.timeline-body ul { padding-left: 1.1rem; color: var(--text-muted); }
.timeline-body li { margin-bottom: .45rem; font-size: .95rem; }
.timeline-body strong { color: var(--text); }

.timeline-item-compact { opacity: .95; }

/* ---------- Cards (projects) ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.25rem; }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem; box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: .75rem;
  transition: transform .15s ease, border-color .15s ease;
}
.card:hover { transform: translateY(-3px); border-color: var(--accent); }
.card h4 { font-size: 1.05rem; }
.card p { font-size: .92rem; color: var(--text-muted); flex-grow: 1; }
.card-link { font-size: .9rem; font-weight: 600; }

/* ---------- Tags ---------- */
.tags { display: flex; flex-wrap: wrap; gap: .4rem; list-style: none; }
.tags li {
  font-size: .75rem; font-weight: 600; color: var(--accent);
  background: var(--accent-soft); padding: .2rem .6rem; border-radius: 999px;
}
.tags-lg li { font-size: .85rem; padding: .3rem .8rem; }

/* ---------- Skills ---------- */
.skills-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.skill-group {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem; box-shadow: var(--shadow);
}
.skill-group h3 { font-size: 1rem; margin-bottom: 1rem; }

/* ---------- Education ---------- */
.edu-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 2.5rem; }
.edu-item { margin-bottom: 1.5rem; }
.edu-item h4 { font-size: 1.02rem; }
.edu-meta { font-size: .88rem; color: var(--text-muted); margin: .2rem 0 .4rem; }
.edu-item p:last-child { font-size: .92rem; color: var(--text-muted); }

.cert-list { list-style: none; }
.cert-list li {
  padding: .55rem 0; border-bottom: 1px solid var(--border);
  font-size: .93rem; color: var(--text-muted);
}
.cert-list li strong { color: var(--text); }
.cert-list li:last-child { border-bottom: none; }

/* ---------- Awards ---------- */
.awards-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.25rem; }

.award {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem; box-shadow: var(--shadow);
  position: relative;
}
.award h3 { font-size: 1.02rem; margin-bottom: .2rem; }
.award-meta { font-size: .82rem; color: var(--text-muted); margin-bottom: .6rem; }
.award p:last-child { font-size: .9rem; color: var(--text-muted); }

.award.featured { border: 1.5px solid var(--accent); }
.award-badge {
  position: absolute; top: -11px; right: 16px;
  background: var(--accent); color: var(--accent-contrast);
  font-size: .72rem; font-weight: 700; padding: .15rem .7rem; border-radius: 999px;
}

/* ---------- Contact ---------- */
.contact { text-align: center; padding-bottom: 5.5rem; }
.contact-lead { max-width: 560px; margin: 0 auto 2rem; color: var(--text-muted); }
.contact-actions { display: flex; justify-content: center; gap: .8rem; flex-wrap: wrap; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border); padding: 1.5rem 0;
  text-align: center; font-size: .85rem; color: var(--text-muted);
}

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .5s ease, transform .5s ease; }
.reveal.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .about-grid, .edu-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .timeline-item { grid-template-columns: 1fr; gap: .5rem; }
  .timeline-meta { flex-direction: row; gap: .8rem; align-items: baseline; }
}

@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; top: 60px; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--border);
    padding: .5rem 1.25rem 1rem;
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: .65rem 0; font-size: 1rem; }
  .nav-links a.nav-cta { display: inline-block; margin-top: .4rem; }
  .nav-links li:last-child { margin-top: .6rem; }
  .hero { padding-top: 3.5rem; }
}