/* =========================================================
   Kapil Rana Portfolio — performance-first premium UI
   Animations: transform + opacity only; GPU-friendly
   ========================================================= */

:root,
[data-theme="dark"] {
  --bg: #050816;
  --bg-elevated: rgba(15, 23, 42, 0.55);
  --bg-glass: rgba(15, 23, 42, 0.45);
  --border: rgba(148, 163, 184, 0.14);
  --border-strong: rgba(96, 165, 250, 0.35);
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --accent: #60a5fa;
  --accent-2: #a78bfa;
  --accent-3: #34d399;
  --gradient: linear-gradient(135deg, #60a5fa 0%, #a78bfa 50%, #34d399 100%);
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.45);
  --nav-bg: rgba(5, 8, 22, 0.75);
  --nav-mobile-bg: rgba(5, 8, 22, 0.95);
  --primary-fg: #0b1224;
  --stat-bg: rgba(15, 23, 42, 0.4);
  --tech-bg: rgba(96, 165, 250, 0.1);
  --tech-border: rgba(96, 165, 250, 0.2);
  --employer-bg: rgba(167, 139, 250, 0.08);
  --employer-border: rgba(167, 139, 250, 0.2);
  --level-track: rgba(255, 255, 255, 0.06);
  --noise-opacity: 0.035;
  --particles-opacity: 0.55;
  --toast-bg: rgba(15, 23, 42, 0.95);
  --orb-core: radial-gradient(circle at 30% 30%, rgba(96, 165, 250, 0.35), rgba(15, 23, 42, 0.9) 60%, #050816);
  --orb-border: rgba(96, 165, 250, 0.4);
  --orb-glow: 0 0 60px rgba(96, 165, 250, 0.25), inset 0 0 40px rgba(167, 139, 250, 0.15);
  --cursor-glow: radial-gradient(circle, rgba(96, 165, 250, 0.12) 0%, transparent 70%);
  --radius: 16px;
  --radius-sm: 10px;
  --nav-h: 72px;
  /* System stack first so text paints before webfont */
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Inter", sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --max: 1120px;
  color-scheme: dark;
}

/* Light mode — high-contrast, readable on pale surfaces */
[data-theme="light"] {
  --bg: #eef2f7;
  --bg-elevated: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.92);
  --border: rgba(15, 23, 42, 0.14);
  --border-strong: rgba(29, 78, 216, 0.45);
  --text: #0b1220;
  --text-muted: #334155;
  --text-dim: #475569;
  --accent: #1d4ed8;
  --accent-2: #6d28d9;
  --accent-3: #047857;
  --gradient: linear-gradient(135deg, #1d4ed8 0%, #6d28d9 50%, #047857 100%);
  --shadow: 0 14px 36px rgba(15, 23, 42, 0.1);
  --nav-bg: rgba(238, 242, 247, 0.92);
  --nav-mobile-bg: rgba(255, 255, 255, 0.98);
  --primary-fg: #ffffff;
  --stat-bg: #ffffff;
  --tech-bg: rgba(29, 78, 216, 0.1);
  --tech-border: rgba(29, 78, 216, 0.28);
  --employer-bg: rgba(109, 40, 217, 0.08);
  --employer-border: rgba(109, 40, 217, 0.22);
  --level-track: rgba(15, 23, 42, 0.12);
  --noise-opacity: 0.015;
  --particles-opacity: 0.28;
  --toast-bg: #ffffff;
  /* Globe orb — saturated blues/teals that pop on light bg */
  --orb-core: radial-gradient(
    circle at 28% 28%,
    #93c5fd 0%,
    #3b82f6 32%,
    #1d4ed8 62%,
    #312e81 100%
  );
  --orb-border: rgba(30, 64, 175, 0.55);
  --orb-glow:
    0 0 48px rgba(37, 99, 235, 0.35),
    0 12px 32px rgba(15, 23, 42, 0.12),
    inset 0 0 28px rgba(255, 255, 255, 0.25);
  --cursor-glow: radial-gradient(circle, rgba(29, 78, 216, 0.12) 0%, transparent 70%);
  color-scheme: light;
}

/* Light-mode readability overrides */
[data-theme="light"] .glass {
  background: var(--bg-glass);
  border-color: var(--border);
  box-shadow: 0 8px 28px rgba(15, 23, 42, 0.06);
}

[data-theme="light"] .glass:hover {
  border-color: var(--border-strong);
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.1);
}

[data-theme="light"] .hero-tagline,
[data-theme="light"] .section-sub,
[data-theme="light"] .about-card p,
[data-theme="light"] .check-list li,
[data-theme="light"] .timeline-blurb,
[data-theme="light"] .timeline-body li,
[data-theme="light"] .impact-card p,
[data-theme="light"] .impact-col li,
[data-theme="light"] .company-impact-role,
[data-theme="light"] .skills-hint,
[data-theme="light"] .skills-detail-body p,
[data-theme="light"] .edu-school,
[data-theme="light"] .footer p,
[data-theme="light"] .location {
  color: var(--text-muted);
}

[data-theme="light"] .stat-label,
[data-theme="light"] .dates,
[data-theme="light"] .contact-label,
[data-theme="light"] .skill-level span {
  color: var(--text-dim);
}

[data-theme="light"] .pill {
  color: var(--text-muted);
  border-color: var(--border);
  background: #ffffff;
  font-weight: 600;
}

[data-theme="light"] .nav-links a {
  color: var(--text-muted);
}

[data-theme="light"] .nav-links a:hover,
[data-theme="light"] .nav-links a.active {
  color: var(--text);
  background: rgba(15, 23, 42, 0.05);
}

[data-theme="light"] .btn-ghost {
  color: var(--text-muted);
}

[data-theme="light"] .btn-ghost:hover {
  color: var(--text);
  background: rgba(15, 23, 42, 0.05);
}

[data-theme="light"] .btn-outline {
  color: var(--text);
  border-color: var(--border-strong);
  background: rgba(29, 78, 216, 0.06);
}

[data-theme="light"] .filter-btn,
[data-theme="light"] .skill-cat,
[data-theme="light"] .skill-chip {
  color: var(--text-muted);
  background: #ffffff;
  border-color: var(--border);
}

[data-theme="light"] .filter-btn:hover,
[data-theme="light"] .skill-cat:hover,
[data-theme="light"] .skill-chip:hover,
[data-theme="light"] .skill-chip.active {
  color: var(--text);
  border-color: var(--border-strong);
  background: rgba(29, 78, 216, 0.08);
}

[data-theme="light"] .stat {
  background: #ffffff;
  border-color: var(--border);
}

[data-theme="light"] .stat-value {
  color: var(--text);
}

[data-theme="light"] .timeline-header:hover {
  background: rgba(15, 23, 42, 0.02);
}

[data-theme="light"] .contact-value {
  color: var(--text);
}

[data-theme="light"] .employer-note {
  color: var(--text-muted);
}

[data-theme="light"] .employer-note strong {
  color: var(--accent-2);
}

[data-theme="light"] #particles-js {
  opacity: 0.22;
}

[data-theme="light"] .noise {
  opacity: 0.012;
}

[data-theme="light"] .scroll-hint {
  color: var(--text-dim);
}

html {
  background: var(--bg);
}

body {
  transition: background-color 0.35s ease, color 0.35s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .cursor-glow { display: none !important; }
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---- Accessibility: skip link + focus ---- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -100px;
  z-index: 1000;
  padding: 0.75rem 1.1rem;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
  outline: 2px solid #fff;
  outline-offset: 2px;
}

:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.btn:focus-visible,
.theme-toggle:focus-visible,
.nav-toggle:focus-visible,
.filter-btn:focus-visible,
.skill-cat:focus-visible,
.skill-chip:focus-visible,
.timeline-header:focus-visible,
.contact-card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* Below-fold sections: browser can skip layout/paint until near viewport */
#experience,
#skills,
#education,
#contact {
  content-visibility: auto;
  contain-intrinsic-size: auto 800px;
}

.effects-off #three-canvas,
.effects-off #particles-js,
.effects-off .cursor-glow,
.effects-off .noise {
  display: none !important;
}

/* Reduce paint cost while scrolling */
.nav,
.glass {
  /* prefer discrete over continuous where supported */
  content-visibility: visible;
}

/* Language switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.lang-switcher-label {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.lang-select {
  appearance: none;
  -webkit-appearance: none;
  font: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text);
  background: var(--stat-bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.4rem 1.75rem 0.4rem 0.75rem;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.55rem center;
  max-width: 9.5rem;
}

.lang-select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* RTL support */
html.rtl,
html[dir="rtl"] {
  direction: rtl;
}

html[dir="rtl"] .nav-links {
  flex-direction: row-reverse;
}

html[dir="rtl"] .nav-actions {
  flex-direction: row-reverse;
}

html[dir="rtl"] .hero-cta {
  flex-direction: row-reverse;
}

html[dir="rtl"] .hero-stats {
  direction: rtl;
}

html[dir="rtl"] .check-list li {
  padding-left: 0;
  padding-right: 1.35rem;
}

html[dir="rtl"] .check-list li::before {
  left: auto;
  right: 0;
}

html[dir="rtl"] .timeline {
  padding-left: 0;
  padding-right: 1.25rem;
}

html[dir="rtl"] .timeline::before {
  left: auto;
  right: 5px;
}

html[dir="rtl"] .timeline-dot {
  left: auto;
  right: -1.25rem;
  margin-left: 0;
  margin-right: -5px;
}

html[dir="rtl"] .timeline-body li {
  padding-left: 0;
  padding-right: 1rem;
}

html[dir="rtl"] .timeline-body li::before {
  left: auto;
  right: 0;
}

html[dir="rtl"] .section-num {
  letter-spacing: 0.08em;
}

html[dir="rtl"] .lang-select {
  background-position: left 0.55rem center;
  padding: 0.4rem 0.75rem 0.4rem 1.75rem;
}

/* Theme toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: color 0.2s, border-color 0.2s, background 0.2s, transform 0.2s;
  position: relative;
}

.theme-toggle:hover {
  color: var(--text);
  border-color: var(--border-strong);
  background: rgba(128, 128, 128, 0.08);
  transform: translateY(-1px);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  position: absolute;
  transition: opacity 0.25s ease, transform 0.25s var(--ease);
}

/* Dark theme shows sun (switch to light); light shows moon */
[data-theme="dark"] .theme-toggle .icon-sun,
:root:not([data-theme]) .theme-toggle .icon-sun {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}
[data-theme="dark"] .theme-toggle .icon-moon,
:root:not([data-theme]) .theme-toggle .icon-moon {
  opacity: 0;
  transform: scale(0.6) rotate(-40deg);
}

[data-theme="light"] .theme-toggle .icon-sun {
  opacity: 0;
  transform: scale(0.6) rotate(40deg);
}
[data-theme="light"] .theme-toggle .icon-moon {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

/* Ambient layers */
#three-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

#particles-js {
  position: fixed;
  inset: 0;
  z-index: 1;
  /* none keeps UI clickable; particles use detect_on: window */
  pointer-events: none;
  opacity: var(--particles-opacity);
  transition: opacity 0.35s ease;
}

[data-theme="light"] #particles-js {
  opacity: 0.55;
}

.noise {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  opacity: var(--noise-opacity);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

.cursor-glow {
  position: fixed;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: var(--cursor-glow);
  transform: translate3d(-50%, -50%, 0);
  pointer-events: none;
  z-index: 3;
  will-change: transform;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.cursor-glow.visible { opacity: 1; }

main, .nav, .footer {
  position: relative;
  z-index: 10;
}

/* Keep page content above ambient canvas/particles always */
main {
  isolation: isolate;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.stat-value,
.stat-suffix {
  display: inline;
  color: var(--text);
}

.stat-suffix {
  color: var(--accent);
  font-weight: 700;
}

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

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* Glass */
.glass {
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
  transition: border-color 0.35s var(--ease), transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.glass:hover {
  border-color: var(--border-strong);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.925rem;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s, border-color 0.25s;
  will-change: transform;
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--gradient);
  color: var(--primary-fg);
  box-shadow: 0 8px 28px rgba(96, 165, 250, 0.35);
}

.btn-primary:hover { box-shadow: 0 12px 36px rgba(167, 139, 250, 0.4); }

.btn-outline {
  border: 1px solid var(--border-strong);
  background: rgba(96, 165, 250, 0.08);
  color: var(--text);
}

.btn-outline:hover { background: rgba(96, 165, 250, 0.16); }

.btn-ghost {
  color: var(--text-muted);
  border: 1px solid transparent;
}

.btn-ghost:hover {
  color: var(--text);
  border-color: var(--border);
  background: rgba(255, 255, 255, 0.03);
}

.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
}

/* Nav */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.25rem;
  z-index: 100;
  transition: background 0.3s, border-color 0.3s, backdrop-filter 0.3s;
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--border);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 700;
}

.logo-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: var(--gradient);
  color: var(--primary-fg);
  font-size: 0.8rem;
  font-weight: 800;
}

.logo-text { font-size: 0.95rem; letter-spacing: -0.02em; }

.nav-links {
  display: flex;
  gap: 0.25rem;
}

.nav-links a {
  padding: 0.45rem 0.75rem;
  border-radius: 8px;
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color 0.2s, background 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  place-items: center;
  flex-direction: column;
  gap: 5px;
  border-radius: 10px;
  border: 1px solid var(--border);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s var(--ease), opacity 0.2s;
}

/* Hero */
.hero {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 2rem;
  width: min(100% - 2rem, var(--max));
  margin: 0 auto;
  padding: calc(var(--nav-h) + 2rem) 0 4rem;
  position: relative;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-3);
  margin-bottom: 1rem;
}

.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-3);
  box-shadow: 0 0 12px var(--accent-3);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(0.85); }
}

.hero h1 {
  font-size: clamp(2.75rem, 6vw, 4.25rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-role {
  font-size: 1.05rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 1rem;
}

.hero-tagline {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 36rem;
  margin-bottom: 1.75rem;
}

.hero-tagline strong { color: var(--text); font-weight: 600; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.75rem;
  max-width: 32rem;
}

.stat {
  padding: 0.85rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--stat-bg);
  text-align: center;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.stat-suffix {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  display: block;
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-top: 0.15rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.hero-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.pill {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.02);
  font-family: var(--mono);
}

/* Hero visual orb */
.hero-visual {
  display: grid;
  place-items: center;
  min-height: 320px;
}

.orb-frame {
  position: relative;
  width: min(320px, 70vw);
  height: min(320px, 70vw);
  display: grid;
  place-items: center;
}

.orb-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid rgba(96, 165, 250, 0.25);
  animation: spin 24s linear infinite;
  will-change: transform;
}

.orb-ring::before {
  content: "";
  position: absolute;
  top: 8%;
  left: 50%;
  width: 10px;
  height: 10px;
  margin-left: -5px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 16px var(--accent);
}

.orb-ring.delay {
  inset: 12%;
  border-color: rgba(167, 139, 250, 0.3);
  animation-direction: reverse;
  animation-duration: 18s;
}

.orb-ring.delay::before {
  background: var(--accent-2);
  box-shadow: 0 0 16px var(--accent-2);
  top: 70%;
}

.orb-core {
  width: 58%;
  height: 58%;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--orb-core);
  border: 1px solid var(--orb-border);
  box-shadow: var(--orb-glow);
  animation: float-y 6s ease-in-out infinite;
  will-change: transform;
}

.orb-letter {
  font-size: 3.5rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.orb-photo {
  width: 78%;
  height: 78%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  display: block;
  background: transparent;
  /* Soft ring without a solid photo background */
  box-shadow:
    0 0 0 3px rgba(255, 255, 255, 0.14),
    0 10px 28px rgba(0, 0, 0, 0.25);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes float-y {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.scroll-hint {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scroll-pulse 1.8s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.7); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); }
}

/* Sections */
.section {
  padding: 5.5rem 0;
}

.section-head {
  margin-bottom: 2.5rem;
}

.section-num {
  display: block;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
  letter-spacing: 0.08em;
}

.section-head h2 {
  font-size: clamp(1.85rem, 3.5vw, 2.5rem);
  letter-spacing: -0.03em;
  font-weight: 800;
  margin-bottom: 0.4rem;
}

.section-sub {
  color: var(--text-muted);
  max-width: 36rem;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.about-card {
  padding: 1.5rem;
}

.about-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.about-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.about-card strong { color: var(--text); }

.check-list li {
  position: relative;
  padding-left: 1.35rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 0.55rem;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent-3);
  font-weight: 700;
  font-size: 0.85rem;
}

/* Experience */
.exp-toolbar {
  margin-bottom: 1.5rem;
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.filter-btn,
.skill-cat {
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.2s;
}

.filter-btn:hover,
.skill-cat:hover {
  color: var(--text);
  border-color: var(--border-strong);
}

.filter-btn.active,
.skill-cat.active {
  color: var(--primary-fg);
  background: var(--gradient);
  border-color: transparent;
}

.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding-left: 1.25rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--accent-2), transparent);
  opacity: 0.4;
}

.timeline-item {
  position: relative;
  overflow: hidden;
  transition: opacity 0.35s, transform 0.35s var(--ease), max-height 0.4s;
}

.timeline-item.filtered-out {
  display: none;
}

.timeline-dot {
  position: absolute;
  left: -1.25rem;
  top: 1.55rem;
  width: 12px;
  height: 12px;
  margin-left: -5px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  box-shadow: 0 0 12px rgba(96, 165, 250, 0.5);
  z-index: 2;
}

.timeline-header {
  width: 100%;
  text-align: left;
  padding: 1.25rem 1.35rem;
  display: block;
}

.timeline-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  margin-bottom: 0.35rem;
}

.company {
  font-weight: 700;
  color: var(--text);
  font-size: 0.95rem;
}

.dates {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-family: var(--mono);
}

.badge {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
}

.badge-current {
  background: rgba(52, 211, 153, 0.15);
  color: var(--accent-3);
  border: 1px solid rgba(52, 211, 153, 0.35);
}

.timeline-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.timeline-title-row h3 {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.chevron {
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--text-muted);
  border-bottom: 2px solid var(--text-muted);
  transform: rotate(45deg);
  transition: transform 0.3s var(--ease);
  flex-shrink: 0;
  margin-top: -4px;
}

.timeline-item.open .chevron {
  transform: rotate(225deg);
  margin-top: 4px;
}

.timeline-blurb {
  margin-top: 0.4rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.timeline-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.4s var(--ease);
}

.timeline-item.open .timeline-body {
  grid-template-rows: 1fr;
}

.timeline-body-inner {
  overflow: hidden;
  min-height: 0;
}

.timeline-body ul,
.timeline-body .tech-row,
.timeline-body .employer-note {
  margin: 0 1.35rem;
}

.timeline-body ul {
  padding-bottom: 0.5rem;
}

.timeline-item.open .timeline-body ul {
  padding-bottom: 0.75rem;
}

.timeline-body li {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 0.5rem;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.timeline-body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.timeline-body li strong { color: var(--text); }

.tech-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding-bottom: 1rem;
}

.tech-row span {
  font-size: 0.72rem;
  font-family: var(--mono);
  padding: 0.25rem 0.55rem;
  border-radius: 6px;
  background: var(--tech-bg);
  color: var(--accent);
  border: 1px solid var(--tech-border);
}

.employer-note {
  margin-bottom: 1.25rem !important;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--employer-bg);
  border: 1px solid var(--employer-border);
  font-size: 0.88rem;
  color: var(--text-muted);
}

.employer-note strong {
  color: var(--accent-2);
  display: block;
  margin-bottom: 0.2rem;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Skills */
.skills-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.skills-cats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skills-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  padding: 1.5rem;
  min-height: 160px;
  align-content: flex-start;
}

.skill-chip {
  padding: 0.55rem 0.95rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: transform 0.25s var(--ease), border-color 0.25s, background 0.25s, color 0.25s, box-shadow 0.25s;
  will-change: transform;
}

.skill-chip:hover,
.skill-chip.active {
  transform: translateY(-3px) scale(1.04);
  color: var(--text);
  border-color: var(--border-strong);
  background: rgba(96, 165, 250, 0.12);
  box-shadow: 0 8px 24px rgba(96, 165, 250, 0.15);
}

.skill-chip.hidden { display: none; }

.skills-detail {
  padding: 1.5rem;
  min-height: 140px;
}

.skills-hint {
  color: var(--text-dim);
  font-size: 0.95rem;
}

.skills-detail-body h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}

.skills-detail-body p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.skill-level {
  margin-bottom: 0.75rem;
}

.skill-level span {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.level-bar {
  margin-top: 0.4rem;
  height: 6px;
  border-radius: 999px;
  background: var(--level-track);
  overflow: hidden;
}

.level-fill {
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: var(--gradient);
  transition: width 0.6s var(--ease);
}

.skill-used {
  font-size: 0.85rem !important;
  font-family: var(--mono);
  color: var(--accent) !important;
}

/* Impact — company-wise */
.impact-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.company-impact-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.company-impact {
  padding: 1.5rem 1.6rem 1.35rem;
}

.company-impact.filtered-out {
  display: none;
}

.company-impact-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem 1.5rem;
  margin-bottom: 1.15rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.company-impact-head h3 {
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  margin: 0.35rem 0 0.25rem;
}

.company-impact-role {
  font-size: 0.88rem;
  color: var(--text-dim);
  font-family: var(--mono);
}

.company-impact-metrics {
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.metric {
  min-width: 5.5rem;
  text-align: center;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--stat-bg);
}

.metric-value {
  display: block;
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.metric-label {
  display: block;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  margin-top: 0.15rem;
}

.impact-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.15rem 1.5rem;
  margin-bottom: 1rem;
}

.impact-col-title {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 0.65rem;
  font-weight: 700;
}

.impact-col-title.business {
  color: var(--accent-3);
}

.impact-col-title.tech {
  color: var(--accent);
}

.impact-col ul {
  list-style: none;
}

.impact-col li {
  position: relative;
  padding-left: 0.95rem;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.impact-col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.impact-col-title.business + ul li::before {
  background: var(--accent-3);
}

.impact-col li strong {
  color: var(--text);
}

.company-impact .tech-row {
  margin: 0;
  padding-top: 0.25rem;
}

/* legacy small cards (if reused) */
.impact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.15rem;
}

.impact-card {
  padding: 1.5rem;
}

.impact-icon {
  font-size: 1.75rem;
  margin-bottom: 0.85rem;
}

.impact-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.impact-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

@media (max-width: 800px) {
  .impact-columns {
    grid-template-columns: 1fr;
  }
}

/* Education */
.edu-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.5rem 1.75rem;
  flex-wrap: wrap;
}

.edu-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.3rem;
}

.edu-school { color: var(--text-muted); font-size: 0.95rem; }

.edu-year {
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--accent);
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  border: 1px solid rgba(96, 165, 250, 0.25);
  background: rgba(96, 165, 250, 0.08);
}

/* Contact */
.contact-section { padding-bottom: 4rem; }

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.contact-card {
  padding: 1.25rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: transform 0.3s var(--ease);
}

.contact-card:hover {
  transform: translateY(-4px);
}

.contact-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  font-weight: 600;
}

.contact-value {
  font-size: 1rem;
  font-weight: 600;
  word-break: break-all;
}

.location {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0 2rem;
  background: var(--bg-elevated);
}

[data-theme="light"] .logo-mark {
  color: #ffffff;
}

[data-theme="light"] #three-canvas {
  opacity: 0.9;
}

[data-theme="light"] .orb-ring {
  border-color: rgba(37, 99, 235, 0.4);
}

[data-theme="light"] .orb-ring::before {
  background: #2563eb;
  box-shadow: 0 0 14px #2563eb;
}

[data-theme="light"] .orb-ring.delay {
  border-color: rgba(13, 148, 136, 0.45);
}

[data-theme="light"] .orb-ring.delay::before {
  background: #0d9488;
  box-shadow: 0 0 14px #0d9488;
}

[data-theme="light"] .orb-letter {
  filter: drop-shadow(0 1px 2px rgba(15, 23, 42, 0.25));
}

[data-theme="light"] .pill {
  background: rgba(255, 255, 255, 0.65);
}

[data-theme="light"] .perf-lite .glass {
  background: rgba(255, 255, 255, 0.92);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer p {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* Reveal animations */
.reveal {
  opacity: 0;
  transform: translate3d(0, 28px, 0);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  transition-delay: var(--delay, 0ms);
  will-change: opacity, transform;
}

.reveal.in {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

/* Hero is always visible (avoid blank page if JS/IO is delayed) */
#hero .reveal {
  opacity: 1;
  transform: none;
}

/* If scripts fail entirely, still show content after a beat */
@supports (animation: fade) {
  @keyframes reveal-fallback {
    to { opacity: 1; transform: none; }
  }
  .reveal:not(.in) {
    animation: reveal-fallback 0.01ms linear 1.5s forwards;
  }
  #hero .reveal:not(.in) {
    animation: none;
  }
}

/* Toast */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translate3d(-50%, 120%, 0);
  background: var(--toast-bg);
  border: 1px solid var(--border-strong);
  color: var(--text);
  padding: 0.75rem 1.25rem;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 500;
  z-index: 200;
  transition: transform 0.4s var(--ease);
  pointer-events: none;
  box-shadow: var(--shadow);
}

.toast.show {
  transform: translate3d(-50%, 0, 0);
}

/* Responsive */
@media (max-width: 960px) {
  .hero {
    grid-template-columns: 1fr;
    padding-top: calc(var(--nav-h) + 1.5rem);
    min-height: auto;
  }

  .hero-visual {
    order: -1;
    min-height: 220px;
  }

  .orb-frame {
    width: min(220px, 55vw);
    height: min(220px, 55vw);
  }

  .orb-letter { font-size: 2.5rem; }

  .about-grid,
  .impact-grid {
    grid-template-columns: 1fr 1fr;
  }

  .nav-links {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    flex-direction: column;
    padding: 1rem;
    background: var(--nav-mobile-bg);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.35s var(--ease), opacity 0.35s;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-toggle { display: grid; }

  .scroll-hint { display: none; }
}

@media (max-width: 640px) {
  .hero-stats {
    grid-template-columns: 1fr 1fr;
  }

  .about-grid,
  .impact-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .logo-text { display: none; }

  .hero-cta .btn { width: 100%; justify-content: center; }
}

/* Low power: reduce blur cost on weak devices via class from JS */
.perf-lite .glass {
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  background: rgba(15, 23, 42, 0.85);
}

.perf-lite #particles-js { opacity: 0.3; }
.perf-lite .cursor-glow { display: none; }
.perf-lite .noise { display: none; }