/* ═══════════════════════════════════════════════════════════════════
   Atandra Bharati — ML Engineer Resume Site
   Author: Atandra Bharati
   ═══════════════════════════════════════════════════════════════════ */

/* ── Custom Properties ────────────────────────────────────────────── */
:root {
  --bg:          #f8f9fb;
  --bg-alt:      #eef1f6;
  --surface:     #ffffff;
  --border:      #e2e8f0;
  --text:        #0f172a;
  --text-muted:  #64748b;
  --text-light:  #94a3b8;

  --accent:      #2563eb;
  --accent-dark: #1d4ed8;
  --accent-glow: rgba(37, 99, 235, 0.15);

  --blue:   #2563eb;
  --orange: #ea580c;
  --purple: #7c3aed;
  --green:  #16a34a;
  --yellow: #ca8a04;
  --teal:   #0891b2;

  --tag-blue-bg:   #eff6ff;
  --tag-blue-txt:  #1e40af;
  --tag-orange-bg: #fff7ed;
  --tag-orange-txt:#9a3412;
  --tag-purple-bg: #f5f3ff;
  --tag-purple-txt:#5b21b6;
  --tag-green-bg:  #f0fdf4;
  --tag-green-txt: #166534;
  --tag-yellow-bg: #fefce8;
  --tag-yellow-txt:#854d0e;
  --tag-teal-bg:   #ecfeff;
  --tag-teal-txt:  #164e63;

  --radius-sm: 6px;
  --radius:    12px;
  --radius-lg: 20px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow:    0 4px 16px rgba(0,0,0,.08), 0 2px 6px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 40px rgba(0,0,0,.1),  0 4px 12px rgba(0,0,0,.06);

  --nav-h:   64px;
  --max-w:   1160px;
  --trans:   .25s cubic-bezier(.4,0,.2,1);
}

/* ── Reset ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ── Container ────────────────────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 60px);
}

/* ══════════════════════════ NAVBAR ══════════════════════════════════ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  transition: background var(--trans), box-shadow var(--trans);
}
.navbar.scrolled {
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}
.nav-inner {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 60px);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.nav-logo {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -.02em;
  color: var(--text);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-links li a {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--trans), background var(--trans);
}
.nav-links li a:hover { color: var(--text); background: var(--bg-alt); }

.nav-btn {
  display: flex !important;
  align-items: center;
  gap: 6px;
  padding: 7px 16px !important;
  background: var(--text) !important;
  color: #fff !important;
  border-radius: var(--radius-sm) !important;
  font-weight: 600 !important;
  transition: background var(--trans) !important;
}
.nav-btn:hover { background: #1e293b !important; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--trans);
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ══════════════════════════ HERO ════════════════════════════════════ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: var(--nav-h);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 60% 40%, rgba(37,99,235,.06) 0%, transparent 70%),
    radial-gradient(ellipse 60% 50% at 80% 80%, rgba(124,58,237,.04) 0%, transparent 60%),
    linear-gradient(180deg, #f0f4ff 0%, var(--bg) 100%);
  z-index: 0;
}
.hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: clamp(32px, 5vw, 80px);
  padding-block: 80px;
}

/* Avatar */
.hero-avatar {
  flex-shrink: 0;
  width: clamp(100px, 14vw, 160px);
  height: clamp(100px, 14vw, 160px);
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 0 6px rgba(37,99,235,.12), var(--shadow-lg);
}
.hero-avatar span {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 800;
  color: #fff;
  letter-spacing: -.04em;
}

/* Text */
.hero-greeting {
  font-size: .9rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.hero-name {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -.04em;
  line-height: 1.1;
  background: linear-gradient(135deg, var(--text) 0%, #334155 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 10px;
}
.hero-title {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 16px;
}
.hero-tagline {
  font-size: clamp(.9rem, 1.5vw, 1.05rem);
  color: var(--text-muted);
  max-width: 560px;
  margin-bottom: 20px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 28px;
}
.hero-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .85rem;
  color: var(--text-muted);
}
.hero-meta svg { flex-shrink: 0; opacity: .7; }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 24px;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--trans);
  border: none;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 10px rgba(37,99,235,.35);
}
.btn-primary:hover {
  background: var(--accent-dark);
  box-shadow: 0 4px 16px rgba(37,99,235,.45);
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-ghost:hover { background: var(--bg-alt); border-color: #cbd5e1; }

/* Scroll hint */
.hero-scroll {
  position: absolute;
  bottom: 32px; left: 50%;
  transform: translateX(-50%);
  z-index: 1;
}
.hero-scroll span {
  display: block;
  width: 20px; height: 32px;
  border: 2px solid var(--border);
  border-radius: 12px;
  position: relative;
}
.hero-scroll span::after {
  content: '';
  position: absolute;
  top: 5px; left: 50%;
  transform: translateX(-50%);
  width: 4px; height: 6px;
  border-radius: 2px;
  background: var(--text-muted);
  animation: scroll-hint 1.8s ease infinite;
}
@keyframes scroll-hint {
  0%   { opacity: 1; top: 5px; }
  100% { opacity: 0; top: 18px; }
}

/* ══════════════════════════ SECTIONS ════════════════════════════════ */
.section { padding-block: clamp(60px, 8vw, 100px); }
.section-alt { background: var(--bg-alt); }

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -.03em;
  margin-bottom: 8px;
  position: relative;
  display: inline-block;
}
.section-title::after {
  content: '';
  position: absolute;
  bottom: -6px; left: 0;
  width: 48px; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--purple));
  border-radius: 2px;
}
.section-sub {
  font-size: .95rem;
  color: var(--text-muted);
  margin-top: 18px;
  margin-bottom: 48px;
}

/* ══════════════════════════ ABOUT ═══════════════════════════════════ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-items: start;
  margin-top: 36px;
}
.about-text p {
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: .975rem;
  line-height: 1.8;
}
.about-text p:last-child { margin-bottom: 0; }

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  flex-shrink: 0;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .6s ease, transform .6s ease, box-shadow var(--trans);
}
.stat-card.revealed { opacity: 1; transform: none; }
.stat-card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.stat-num {
  display: block;
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  font-weight: 800;
  letter-spacing: -.03em;
  color: var(--accent);
}
.stat-label {
  display: block;
  font-size: .75rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-top: 2px;
}

/* ══════════════════════════ SKILLS ══════════════════════════════════ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 36px;
}
.skill-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .5s ease, transform .5s ease, box-shadow var(--trans);
}
.skill-group.revealed { opacity: 1; transform: none; }
.skill-group:hover { box-shadow: var(--shadow); }

.skill-group-title {
  font-size: .825rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.skill-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.dot-blue   { background: var(--blue); }
.dot-orange { background: var(--orange); }
.dot-purple { background: var(--purple); }
.dot-green  { background: var(--green); }
.dot-yellow { background: var(--yellow); }
.dot-teal   { background: var(--teal); }

.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 500;
  font-family: 'JetBrains Mono', monospace;
  transition: transform var(--trans);
}
.tag:hover { transform: translateY(-1px); }

.tag-blue   { background: var(--tag-blue-bg);   color: var(--tag-blue-txt); }
.tag-orange { background: var(--tag-orange-bg); color: var(--tag-orange-txt); }
.tag-purple { background: var(--tag-purple-bg); color: var(--tag-purple-txt); }
.tag-green  { background: var(--tag-green-bg);  color: var(--tag-green-txt); }
.tag-yellow { background: var(--tag-yellow-bg); color: var(--tag-yellow-txt); }
.tag-teal   { background: var(--tag-teal-bg);   color: var(--tag-teal-txt); }

/* ══════════════════════════ PROJECTS ════════════════════════════════ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 12px;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: var(--shadow-sm);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .6s ease, transform .6s ease, box-shadow var(--trans), border-color var(--trans);
}
.project-card.revealed { opacity: 1; transform: none; }
.project-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: #c7d7f5;
  transform: translateY(-4px);
}

.card-featured {
  grid-column: span 2;
  border-left: 3px solid var(--accent);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.card-icon { font-size: 1.5rem; line-height: 1; }
.card-badge {
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-glow);
  padding: 3px 10px;
  border-radius: 999px;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.3;
}
.card-title a { color: var(--text); transition: color var(--trans); }
.card-title a:hover { color: var(--accent); }

.card-desc {
  font-size: .9rem;
  color: var(--text-muted);
  line-height: 1.75;
}

.card-highlights {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.card-highlights li {
  font-size: .85rem;
  color: var(--text-muted);
  padding-left: 16px;
  position: relative;
  line-height: 1.6;
}
.card-highlights li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
  font-size: .8rem;
}

.card-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: .85rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: auto;
  transition: gap var(--trans), color var(--trans);
}
.card-link:hover { gap: 8px; color: var(--accent-dark); }

/* ══════════════════════════ EDUCATION ═══════════════════════════════ */
.edu-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  display: flex;
  gap: 28px;
  align-items: flex-start;
  box-shadow: var(--shadow-sm);
  border-left: 3px solid var(--accent);
  margin-top: 36px;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .6s ease, transform .6s ease;
}
.edu-card.revealed { opacity: 1; transform: none; }

.edu-icon { font-size: 2rem; flex-shrink: 0; margin-top: 2px; }
.edu-degree {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -.02em;
  margin-bottom: 6px;
}
.edu-school {
  font-size: .95rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 4px;
}
.edu-school a { color: var(--accent); }
.edu-school a:hover { text-decoration: underline; }
.edu-period {
  font-size: .85rem;
  color: var(--text-light);
  font-family: 'JetBrains Mono', monospace;
  margin-bottom: 14px;
}
.edu-note {
  font-size: .9rem;
  color: var(--text-muted);
  line-height: 1.8;
}

/* ══════════════════════════ FOOTER ══════════════════════════════════ */
.footer {
  background: var(--text);
  color: #e2e8f0;
  padding-block: 48px;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-align: center;
}
.footer-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
}
.footer-tagline {
  font-size: .85rem;
  color: #94a3b8;
}
.footer-links {
  display: flex;
  gap: 24px;
  margin: 12px 0;
}
.footer-links a {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: .9rem;
  color: #cbd5e1;
  font-weight: 500;
  transition: color var(--trans);
}
.footer-links a:hover { color: #fff; }
.footer-copy {
  font-size: .8rem;
  color: #64748b;
  margin-top: 6px;
}

/* ══════════════════════════ RESPONSIVE ══════════════════════════════ */
@media (max-width: 900px) {
  .hero-inner { flex-direction: column; text-align: center; padding-block: 60px 80px; }
  .hero-meta  { justify-content: center; }
  .hero-actions { justify-content: center; }
  .hero-tagline { margin-inline: auto; }
  .about-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: repeat(4, 1fr); }
  .projects-grid { grid-template-columns: 1fr; }
  .card-featured { grid-column: span 1; }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    background: rgba(255,255,255,.98);
    backdrop-filter: blur(12px);
    padding: 16px;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    border-top: 1px solid var(--border);
    box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .nav-links li a { padding: 10px 16px; }
  .hamburger { display: flex; }

  .about-stats { grid-template-columns: repeat(2, 1fr); }
  .skills-grid { grid-template-columns: 1fr; }
  .hero-avatar { width: 90px; height: 90px; }
  .edu-card { flex-direction: column; gap: 16px; }
}

@media (max-width: 400px) {
  .hero-actions { flex-direction: column; }
  .btn { justify-content: center; }
}