/* ============ Design tokens ============ */
:root {
  --bg: #f6f7fb;
  --bg-elevated: #ffffff;
  --bg-subtle: #eef0f6;
  --border: #e2e5ee;
  --text: #12141c;
  --text-muted: #5b6072;
  --text-faint: #8a8fa3;
  --accent: #4f46e5;
  --accent-2: #7c3aed;
  --accent-contrast: #ffffff;
  --success: #12805c;
  --success-bg: #e3f6ee;
  --warn: #93650a;
  --warn-bg: #fdf3d9;
  --dev: #5b5f73;
  --dev-bg: #eceef4;
  --shadow: 0 1px 2px rgba(16,18,30,.04), 0 8px 24px -8px rgba(16,18,30,.08);
  --shadow-hover: 0 4px 12px rgba(16,18,30,.06), 0 20px 40px -16px rgba(16,18,30,.16);
  --radius: 14px;
  --font-ui: "Hind Siliguri", "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
}

:root[data-theme="dark"] {
  --bg: #0b0d14;
  --bg-elevated: #12151f;
  --bg-subtle: #171b28;
  --border: #232838;
  --text: #eef0f6;
  --text-muted: #a2a7bd;
  --text-faint: #6c7189;
  --accent: #818cf8;
  --accent-2: #a78bfa;
  --accent-contrast: #0b0d14;
  --success: #4ade9a;
  --success-bg: #103527;
  --warn: #f2c14e;
  --warn-bg: #3a2e0c;
  --dev: #a2a7bd;
  --dev-bg: #1d2233;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px -8px rgba(0,0,0,.5);
  --shadow-hover: 0 4px 16px rgba(0,0,0,.4), 0 24px 48px -16px rgba(0,0,0,.6);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b0d14;
    --bg-elevated: #12151f;
    --bg-subtle: #171b28;
    --border: #232838;
    --text: #eef0f6;
    --text-muted: #a2a7bd;
    --text-faint: #6c7189;
    --accent: #818cf8;
    --accent-2: #a78bfa;
    --accent-contrast: #0b0d14;
    --success: #4ade9a;
    --success-bg: #103527;
    --warn: #f2c14e;
    --warn-bg: #3a2e0c;
    --dev: #a2a7bd;
    --dev-bg: #1d2233;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px -8px rgba(0,0,0,.5);
    --shadow-hover: 0 4px 16px rgba(0,0,0,.4), 0 24px 48px -16px rgba(0,0,0,.6);
  }
}

/* ============ Reset ============ */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background .2s ease, color .2s ease;
}
img { max-width: 100%; }
[hidden] { display: none !important; }
a { color: inherit; text-decoration: none; }

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding-inline: 20px;
}

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

/* ============ Motion ============ */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(22px);
    transition: opacity .7s cubic-bezier(.22,.68,0,1), transform .7s cubic-bezier(.22,.68,0,1);
  }
  .reveal.reveal-visible {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes floatBlob {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -24px) scale(1.08); }
  66% { transform: translate(-24px, 18px) scale(0.96); }
}

@keyframes pulseRing {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 45%, transparent); }
  70% { box-shadow: 0 0 0 14px color-mix(in srgb, var(--accent) 0%, transparent); }
  100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 0%, transparent); }
}

/* ============ Header ============ */
.site-header {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 14px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}
.brand-mark { color: var(--accent); font-size: 1.1rem; }
.brand-accent { color: var(--accent); }
.main-nav {
  display: flex;
  gap: 24px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
}
.main-nav a {
  position: relative;
  padding-bottom: 2px;
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width .2s ease;
}
.main-nav a:hover { color: var(--text); }
.main-nav a:hover::after { width: 100%; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text-muted);
  cursor: pointer;
  transition: border-color .15s ease, color .15s ease;
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); transform: rotate(-8deg); }

.nav-toggle { display: none; }
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform .2s ease, opacity .2s ease;
}
.nav-toggle span::before { transform: translateY(-6px); }
.nav-toggle span::after { transform: translateY(4px); }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { transform: translateY(0) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after { transform: translateY(0) rotate(-45deg); }
.icon-sun, .icon-moon { display: none; }
:root[data-theme="dark"] .icon-sun { display: block; }
:root[data-theme="light"] .icon-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun { display: block; }
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .icon-moon { display: block; }
}

/* ============ Hero ============ */
.hero { position: relative; padding-block: 64px 40px; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; z-index: 0; overflow: hidden; pointer-events: none; }
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(64px);
  opacity: .35;
}
.blob-a {
  width: 380px; height: 380px;
  top: -140px; left: -80px;
  background: radial-gradient(circle, var(--accent), transparent 70%);
  animation: floatBlob 16s ease-in-out infinite;
}
.blob-b {
  width: 320px; height: 320px;
  top: -60px; right: -100px;
  background: radial-gradient(circle, var(--accent-2), transparent 70%);
  animation: floatBlob 20s ease-in-out infinite reverse;
}
:root[data-theme="dark"] .blob { opacity: .22; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .blob { opacity: .22; }
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(color-mix(in srgb, var(--border) 70%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--border) 70%, transparent) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(ellipse 70% 60% at 30% 0%, black 40%, transparent 85%);
}
@media (prefers-reduced-motion: reduce) {
  .blob { animation: none; }
}
.hero-inner { position: relative; z-index: 1; max-width: 760px; }
.eyebrow {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0 0 14px;
}
.hero h1 {
  font-size: clamp(1.9rem, 4vw, 2.85rem);
  line-height: 1.25;
  margin: 0 0 18px;
  letter-spacing: -0.02em;
}
.hero h1 .accent {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  color: var(--text-muted);
  font-size: 1.02rem;
  max-width: 60ch;
  margin: 0 0 32px;
}

.search-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 16px;
  box-shadow: var(--shadow);
  color: var(--text-faint);
  max-width: 640px;
}
.search-wrap:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}
#searchInput {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 0.95rem;
}
#searchInput::placeholder { color: var(--text-faint); }
.search-kbd {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 7px;
  font-size: 0.75rem;
  color: var(--text-faint);
  font-family: inherit;
}

.stats {
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--text-faint);
}

/* ============ Projects ============ */
.projects-section { padding-block: 24px 72px; }
.section-head { margin-bottom: 20px; }
.section-head h2 {
  font-size: 1.5rem;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}
.section-sub { color: var(--text-muted); margin: 0; font-size: 0.92rem; }
.section-head.center { text-align: center; }
.section-head.center .section-sub { max-width: 46ch; margin-inline: auto; }

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}
.chip {
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text-muted);
  padding: 7px 16px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all .15s ease;
}
.chip:hover { border-color: var(--accent); color: var(--text); }
.chip-active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 18px;
}

.project-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.project-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}
.card-icon {
  font-size: 1.6rem;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-subtle);
  border-radius: 12px;
}
.status-badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
}
.status-live { background: var(--success-bg); color: var(--success); }
.status-beta { background: var(--warn-bg); color: var(--warn); }
.status-development { background: var(--dev-bg); color: var(--dev); }

.card-title {
  font-size: 1.08rem;
  margin: 0 0 4px;
  letter-spacing: -0.01em;
}
.card-tagline {
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 500;
  margin: 0 0 10px;
}
.card-desc {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin: 0;
  flex: 1;
}
.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}
.card-category {
  font-size: 0.78rem;
  color: var(--text-faint);
  font-weight: 500;
}
.card-cta {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
}
.card-cta svg { transition: transform .15s ease; }
.project-card:hover .card-cta svg { transform: translateX(3px); }

.no-results {
  text-align: center;
  color: var(--text-faint);
  padding: 48px 0;
}

/* ============ About ============ */
.about-section {
  background: var(--bg-subtle);
  padding-block: 56px;
  border-block: 1px solid var(--border);
}
.about-inner { max-width: 700px; }
.about-section h2 {
  font-size: 1.4rem;
  margin: 0 0 14px;
}
.about-section p {
  color: var(--text-muted);
  margin: 0 0 18px;
}
.about-disambiguation {
  font-size: 0.86rem;
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
}
.about-disambiguation code {
  font-family: ui-monospace, "JetBrains Mono", monospace;
  background: var(--bg-subtle);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.92em;
}
.about-points {
  margin: 0;
  padding-left: 20px;
  color: var(--text-muted);
  font-size: 0.94rem;
  display: grid;
  gap: 8px;
}

/* ============ Contact ============ */
.contact-section { padding-block: 64px 72px; }

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 32px;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease, background .18s ease;
}
.contact-card:hover {
  transform: translateY(-4px) scale(1.015);
  box-shadow: var(--shadow-hover);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
}
.contact-icon {
  flex-shrink: 0;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 16%, transparent), color-mix(in srgb, var(--accent-2) 16%, transparent));
  color: var(--accent);
  transition: transform .25s ease;
}
.contact-card:hover .contact-icon { transform: rotate(-8deg) scale(1.08); }
.contact-meta { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.contact-label { font-size: 0.78rem; color: var(--text-faint); font-weight: 600; text-transform: uppercase; letter-spacing: .03em; }
.contact-value {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Floating WhatsApp quick-contact button */
.whatsapp-float {
  position: fixed;
  right: 20px;
  bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  z-index: 60;
  width: 54px;
  height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: #25d366;
  color: #fff;
  box-shadow: 0 6px 20px rgba(37, 211, 102, .4);
  animation: pulseRing 2.6s ease-out infinite;
  transition: transform .2s ease;
}
.whatsapp-float:hover { transform: scale(1.08); }

/* ============ Footer ============ */
.site-footer {
  padding-block: 36px 24px;
  padding-bottom: calc(24px + env(safe-area-inset-bottom, 0px));
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 20px;
}
.footer-brand { font-weight: 700; margin: 0; }
.footer-tagline { color: var(--text-faint); margin: 4px 0 0; font-size: 0.88rem; }
.footer-links { display: flex; align-items: center; gap: 18px; font-size: 0.88rem; color: var(--text-muted); }
.footer-links a { display: inline-flex; align-items: center; justify-content: center; transition: color .15s ease, transform .15s ease; }
.footer-links a:hover { color: var(--accent); transform: translateY(-2px); }
.footer-copy {
  text-align: center;
  color: var(--text-faint);
  font-size: 0.8rem;
  margin: 0;
}

/* ============ Highlights ============ */
.highlights-section { padding-block: 8px 8px; }
.highlight-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 32px;
}
.highlight-card {
  padding: 20px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.highlight-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
}
.highlight-icon {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 16%, transparent), color-mix(in srgb, var(--accent-2) 16%, transparent));
  color: var(--accent);
  margin-bottom: 14px;
  font-size: 1.25rem;
}
.highlight-card h3 { font-size: 1rem; margin: 0 0 6px; letter-spacing: -0.01em; }
.highlight-card p { color: var(--text-muted); font-size: 0.88rem; margin: 0; }

/* ============ Responsive ============ */
@media (max-width: 900px) {
  .container { padding-inline: 18px; }
  .contact-grid { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
}

@media (max-width: 720px) {
  .main-nav {
    position: absolute;
    inset: 100% 16px auto 16px;
    flex-direction: column;
    gap: 2px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 10px;
    box-shadow: var(--shadow-hover);
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    transition: opacity .18s ease, transform .18s ease;
  }
  .main-nav.nav-open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  .main-nav a {
    padding: 10px 12px;
    border-radius: 8px;
  }
  .main-nav a:hover { background: var(--bg-subtle); }
  .main-nav a::after { display: none; }
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--bg-elevated);
    color: var(--text);
    cursor: pointer;
  }
}

@media (min-width: 721px) {
  .nav-toggle { display: none; }
}

@media (max-width: 640px) {
  .hero { padding-block: 32px 24px; }
  .hero h1 { font-size: clamp(1.6rem, 7vw, 2.2rem); }
  .hero-sub { font-size: 0.95rem; }
  .search-wrap { padding: 10px 14px; }
  .project-grid { grid-template-columns: 1fr; }
  .highlight-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; align-items: flex-start; text-align: left; }
  .whatsapp-float { right: 14px; width: 50px; height: 50px; }
}

@media (max-width: 380px) {
  .brand-text { font-size: 1rem; }
  .card-icon { width: 40px; height: 40px; }
}