/* =========================================================
   Avinaya Acharya — Portfolio
   Design tokens, layout, components, animations
   ========================================================= */

:root {
  /* Palette */
  --bg: #050816;
  --surface: #111827;
  --surface-2: #161f33;
  --primary: #7c3aed;
  --secondary: #06b6d4;
  --accent: #22c55e;
  --text: #ffffff;
  --muted: #9ca3af;

  /* Derived */
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --glass: rgba(255, 255, 255, 0.04);
  --glass-2: rgba(255, 255, 255, 0.06);
  --glow-primary: rgba(124, 58, 237, 0.45);
  --glow-secondary: rgba(6, 182, 212, 0.35);

  /* Type */
  --font-display: "Sora", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;

  /* Layout */
  --max: 1200px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --radius: 18px;
  --radius-sm: 12px;

  --nav-h: 72px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
ul { list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; color: inherit; background: none; border: none; }

h1, h2, h3 { font-family: var(--font-display); line-height: 1.1; font-weight: 700; }

::selection { background: var(--primary); color: #fff; }

/* ---------- Accessibility helpers ---------- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 1000;
  background: var(--primary);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; }

:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- Layout ---------- */
.container { width: 100%; max-width: var(--max); margin-inline: auto; padding-inline: var(--gutter); }

.section { padding: clamp(4.5rem, 9vw, 8rem) 0; position: relative; }

.section-head { max-width: 760px; margin-bottom: clamp(2.25rem, 5vw, 3.5rem); }
.section-kicker {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--secondary);
  margin-bottom: 0.9rem;
}
.section-title { font-size: clamp(1.9rem, 5vw, 3rem); letter-spacing: -0.02em; }
.section-sub { color: var(--muted); margin-top: 0.9rem; font-size: 1.05rem; }

/* ---------- Background layers ---------- */
.bg-mesh {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(50% 45% at 15% 12%, rgba(124, 58, 237, 0.22), transparent 70%),
    radial-gradient(45% 45% at 85% 18%, rgba(6, 182, 212, 0.18), transparent 70%),
    radial-gradient(55% 50% at 50% 100%, rgba(34, 197, 94, 0.10), transparent 70%);
  filter: blur(10px);
}

.bg-particles {
  position: fixed;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.6;
}

/* ---------- Cursor glow ---------- */
.cursor-glow {
  position: fixed;
  top: 0; left: 0;
  width: 480px; height: 480px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--glow-primary), transparent 60%);
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 0;
  opacity: 0;
  transition: opacity 0.4s var(--ease);
  mix-blend-mode: screen;
  will-change: transform;
}

/* ---------- Scroll progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  z-index: 200;
  background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
  box-shadow: 0 0 12px var(--glow-secondary);
}

/* ---------- Glass card ---------- */
.glass-card {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 20px 50px -30px rgba(0, 0, 0, 0.9);
  position: relative;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  border-radius: 999px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease),
              background 0.25s var(--ease), border-color 0.25s var(--ease);
  will-change: transform;
}
.btn-sm { padding: 0.55rem 1.1rem; font-size: 0.85rem; }

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  box-shadow: 0 12px 30px -12px var(--glow-primary);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 18px 40px -12px var(--glow-primary); }

.btn-ghost {
  background: var(--glass-2);
  border-color: var(--border-strong);
  color: var(--text);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover { transform: translateY(-3px); border-color: var(--secondary); box-shadow: 0 12px 28px -16px var(--glow-secondary); }

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  display: flex;
  align-items: center;
  transition: transform 0.4s var(--ease), background 0.4s var(--ease),
              border-color 0.4s var(--ease), backdrop-filter 0.4s var(--ease);
  border-bottom: 1px solid transparent;
}
.navbar.scrolled {
  background: rgba(5, 8, 22, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--border);
}
.navbar.hide { transform: translateY(-110%); }

.nav-inner {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-logo { display: inline-flex; align-items: center; gap: 0.6rem; font-family: var(--font-display); font-weight: 700; }
.nav-logo-mark {
  display: grid; place-items: center;
  width: 36px; height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  font-size: 0.85rem; letter-spacing: 0.02em;
  box-shadow: 0 8px 20px -10px var(--glow-primary);
}
.nav-logo-text { font-size: 1.05rem; }
.nav-logo-text .dot { color: var(--secondary); }

.nav-links { display: flex; gap: 0.35rem; }
.nav-link {
  position: relative;
  padding: 0.5rem 0.85rem;
  font-size: 0.92rem;
  color: var(--muted);
  border-radius: 999px;
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}
.nav-link:hover { color: var(--text); }
.nav-link.active { color: var(--text); background: var(--glass-2); }

.nav-actions { display: flex; align-items: center; gap: 0.75rem; }

.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav-toggle span {
  width: 24px; height: 2px; background: var(--text); border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-h);
  overflow: hidden;
}
.hero-glow {
  position: absolute;
  width: 60vw; height: 60vw;
  max-width: 800px; max-height: 800px;
  top: 8%; left: 50%;
  transform: translateX(-50%);
  background: radial-gradient(circle, rgba(124, 58, 237, 0.28), transparent 65%);
  filter: blur(40px);
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 2; text-align: center; }

.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--accent);
  padding: 0.45rem 1rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--glass);
  margin-bottom: 1.6rem;
}
.hero-eyebrow::first-letter { letter-spacing: 0; }

.hero-title {
  font-size: clamp(2.6rem, 9vw, 6rem);
  letter-spacing: -0.03em;
  font-weight: 800;
  background: linear-gradient(135deg, #fff 30%, #c4b5fd 60%, var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.6rem;
}
.hero-role {
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 3vw, 1.6rem);
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 1.4rem;
}
.hero-headline {
  max-width: 680px;
  margin: 0 auto 2.4rem;
  color: var(--muted);
  font-size: clamp(1rem, 2.2vw, 1.2rem);
}
.hero-headline strong { color: var(--text); font-weight: 600; }

.hero-cta { display: flex; flex-wrap: wrap; gap: 0.9rem; justify-content: center; margin-bottom: 3.2rem; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  max-width: 720px;
  margin: 0 auto;
}
.hero-stats li {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.1rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--glass);
  backdrop-filter: blur(10px);
}
.hero-stats .counter {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-stats small { color: var(--muted); font-size: 0.78rem; margin-top: 0.25rem; text-align: center; }

.scroll-hint {
  position: absolute;
  bottom: 1.75rem; left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}
.mouse {
  display: block;
  width: 26px; height: 42px;
  border: 2px solid var(--border-strong);
  border-radius: 14px;
  position: relative;
}
.wheel {
  position: absolute;
  top: 8px; left: 50%;
  width: 4px; height: 8px;
  margin-left: -2px;
  background: var(--secondary);
  border-radius: 4px;
  animation: wheel 1.8s var(--ease) infinite;
}
@keyframes wheel { 0% { opacity: 0; transform: translateY(0); } 40% { opacity: 1; } 100% { opacity: 0; transform: translateY(14px); } }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 1.5rem; align-items: start; }
.about-main { padding: clamp(1.5rem, 3vw, 2.5rem); }
.about-main p + p { margin-top: 1.1rem; }
.about-main strong { color: var(--text); }
.about-highlights { display: grid; gap: 1.2rem; }
.about-highlights li { padding: 1.3rem 1.4rem; }
.about-highlights h3 { font-size: 1.05rem; margin-bottom: 0.4rem; }
.about-highlights p { color: var(--muted); font-size: 0.95rem; }

/* ---------- Skills ---------- */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.3rem; }
.skill-card { padding: 1.6rem; transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease); }
.skill-card:hover { transform: translateY(-6px); border-color: var(--border-strong); box-shadow: 0 24px 50px -30px var(--glow-primary); }
.skill-cat { font-size: 1.1rem; margin-bottom: 1.1rem; color: var(--text); }
.skill-cat::before { content: ""; display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 0.6rem; background: linear-gradient(135deg, var(--primary), var(--secondary)); }

.chips { display: flex; flex-wrap: wrap; gap: 0.55rem; }
.chips li {
  font-size: 0.85rem;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  background: var(--glass-2);
  border: 1px solid var(--border);
  color: #d6dbe7;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}
.chips li:hover { transform: translateY(-2px); border-color: var(--secondary); color: #fff; }
.chips.small li { font-size: 0.78rem; padding: 0.3rem 0.7rem; }

/* ---------- Timeline ---------- */
.timeline { position: relative; max-width: 980px; margin-inline: auto; }
.timeline::before {
  content: "";
  position: absolute;
  top: 0; bottom: 0;
  left: 18px;
  width: 2px;
  background: linear-gradient(var(--primary), var(--secondary), transparent);
}
.tl-item { position: relative; padding-left: 56px; margin-bottom: 1.8rem; }
.tl-dot {
  position: absolute;
  left: 9px; top: 8px;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--primary);
  box-shadow: 0 0 0 4px rgba(124, 58, 237, 0.15), 0 0 18px var(--glow-primary);
}
.tl-card { padding: 1.6rem 1.7rem; transition: transform 0.3s var(--ease), border-color 0.3s var(--ease); }
.tl-card:hover { transform: translateX(6px); border-color: var(--border-strong); }
.tl-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.5rem 0.9rem; }
.tl-head h3 { font-size: 1.25rem; }
.tl-company { color: var(--secondary); font-weight: 600; font-family: var(--font-display); }
.tl-meta { display: block; color: var(--muted); font-size: 0.85rem; margin: 0.35rem 0 1rem; }
.tl-points { display: grid; gap: 0.55rem; margin-bottom: 1.1rem; }
.tl-points li { position: relative; padding-left: 1.3rem; color: #cdd3e0; font-size: 0.96rem; }
.tl-points li::before { content: "▹"; position: absolute; left: 0; color: var(--accent); }
.tl-points strong { color: #fff; }

/* ---------- Projects ---------- */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 1.5rem; }
.project-card {
  padding: 1.8rem;
  overflow: hidden;
  transform-style: preserve-3d;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.project-card:hover { border-color: var(--border-strong); box-shadow: 0 30px 60px -35px var(--glow-primary); }
.project-glow {
  position: absolute;
  width: 280px; height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--glow-secondary), transparent 60%);
  top: var(--my, -40%); left: var(--mx, 50%);
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity 0.4s var(--ease);
  pointer-events: none;
}
.project-card:hover .project-glow { opacity: 0.7; }
.project-title { font-size: 1.35rem; margin-bottom: 0.7rem; }
.project-desc { color: var(--muted); margin-bottom: 1.1rem; }
.project-features { display: grid; gap: 0.5rem; margin-bottom: 1.1rem; }
.project-features li { position: relative; padding-left: 1.3rem; font-size: 0.92rem; color: #cdd3e0; }
.project-features li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }
.project-impact {
  font-size: 0.9rem;
  color: var(--accent);
  background: rgba(34, 197, 94, 0.08);
  border: 1px solid rgba(34, 197, 94, 0.18);
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1.1rem;
}

/* ---------- Education ---------- */
.edu-wrap { max-width: 720px; }
.edu-card { display: flex; gap: 1.5rem; align-items: center; padding: 1.6rem 1.8rem; flex-wrap: wrap; }
.edu-card:hover { border-color: var(--border-strong); }
.edu-year {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--secondary);
  white-space: nowrap;
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--glass);
}
.edu-body h3 { font-size: 1.2rem; margin-bottom: 0.3rem; }
.edu-school { color: #cdd3e0; }
.edu-loc { color: var(--muted); font-size: 0.9rem; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.2rem; margin-bottom: 2.5rem; }
.contact-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.3rem;
  padding: 1.5rem;
  text-align: left;
  width: 100%;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.contact-card:hover { transform: translateY(-6px); border-color: var(--secondary); box-shadow: 0 24px 50px -30px var(--glow-secondary); }
.contact-icon {
  display: grid; place-items: center;
  width: 42px; height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  font-size: 1.05rem; font-weight: 700;
  margin-bottom: 0.6rem;
}
.contact-label { font-family: var(--font-display); font-weight: 600; font-size: 0.95rem; }
.contact-value { color: #cdd3e0; font-size: 0.92rem; word-break: break-word; }
.copy-hint { color: var(--muted); font-size: 0.78rem; margin-top: 0.25rem; }
.contact-cta { display: flex; flex-wrap: wrap; gap: 0.9rem; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); padding: 2rem 0; margin-top: 2rem; }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.5rem; color: var(--muted); font-size: 0.88rem; }

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  bottom: 1.5rem; left: 50%;
  transform: translate(-50%, 150%);
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  color: #fff;
  padding: 0.8rem 1.4rem;
  border-radius: 999px;
  font-size: 0.9rem;
  z-index: 300;
  box-shadow: 0 16px 40px -20px rgba(0, 0, 0, 0.8);
  transition: transform 0.4s var(--ease), opacity 0.4s var(--ease);
  opacity: 0;
}
.toast.show { transform: translate(-50%, 0); opacity: 1; }

/* ---------- Reveal animations (CSS fallback) ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 920px) {
  .about-grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .nav-links {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    flex-direction: column;
    gap: 0.4rem;
    padding: 1.25rem var(--gutter) 1.75rem;
    background: rgba(5, 8, 22, 0.92);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--border);
    transform: translateY(-150%);
    transition: transform 0.4s var(--ease);
  }
  .nav-links.open { transform: translateY(0); }
  .nav-link { display: block; padding: 0.8rem 1rem; font-size: 1rem; }
  .nav-toggle { display: flex; }
  .nav-actions .btn-ghost { display: none; }

  .hero-stats { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 420px) {
  .hero-cta .btn { width: 100%; }
  .edu-card { flex-direction: column; align-items: flex-start; }
}

@media (min-width: 1700px) {
  :root { --max: 1360px; }
  body { font-size: 1.05rem; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
  .bg-particles, .cursor-glow, .wheel { display: none; }
}