/* ============================================================
   PORTFOLIO — STYLE SHEET  v2
   Professional · Minimal · Modern

   TABLE OF CONTENTS
   1.  CSS Custom Properties (Design Tokens)
   2.  Reset & Base
   3.  Background Canvas
   4.  Scroll Progress
   5.  Custom Cursor
   6.  Loader
   7.  Navbar
   8.  Mobile Menu
   9.  Utility Classes
   10. Sections (shared)
   11. Buttons
   12. Glass Card
   13. Reveal Animations
   14. HERO
   15. ABOUT
   16. EDUCATION · Timeline
   17. EXPERIENCE
   18. PROJECTS
   19. SKILLS (redesigned)
   20. CERTIFICATIONS
   21. PUBLICATIONS
   22. CONTACT
   23. FOOTER
   24. Back-to-top
   25. Modal
   26. Light Mode Overrides
   27. Responsive
   ============================================================ */

/* ── 1. Design Tokens ─────────────────────────────────────── */
:root {
  /* Colour palette — tweak these to retheme the entire site */
  --accent:       #5b52e8;   /* primary indigo-violet */
  --accent-2:     #06b6d4;   /* secondary cyan */
  --accent-warm:  #f59e0b;   /* amber for highlights */

  /* Dark mode backgrounds */
  --bg:           #05050f;
  --bg-2:         #0c0c1e;
  --bg-3:         #131326;

  /* Glass surfaces */
  --glass:        rgba(255,255,255,0.04);
  --glass-border: rgba(255,255,255,0.07);
  --glass-hover:  rgba(255,255,255,0.07);

  /* Typography */
  --text:         #e8e8f4;
  --text-sub:     #9090b8;
  --text-dim:     #56567a;

  /* Spacing rhythm (8 px base) */
  --space-1:  8px;
  --space-2:  16px;
  --space-3:  24px;
  --space-4:  32px;
  --space-5:  48px;
  --space-6:  64px;
  --space-7:  96px;
  --space-8:  128px;

  /* Shape */
  --radius:    14px;
  --radius-sm:  8px;
  --radius-xs:  5px;

  /* Motion */
  --ease:        cubic-bezier(0.4,0,0.2,1);
  --duration:    0.3s;
  --duration-lg: 0.6s;

  /* Fonts */
  --f-display: 'Space Grotesk', system-ui, sans-serif;
  --f-body:    'Inter', system-ui, sans-serif;
  --f-mono:    'JetBrains Mono', 'Fira Mono', monospace;

  /* Shadows */
  --shadow-card: 0 4px 32px rgba(0,0,0,0.3);
  --glow-accent: 0 0 32px rgba(91,82,232,0.22);
}

/* ── 2. Reset & Base ──────────────────────────────────────── */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; -webkit-text-size-adjust:100%; }

body {
  font-family: var(--f-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
  min-height: 100vh;
}

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

/* Selection colour */
::selection { background:rgba(91,82,232,.35); color:var(--text); }

/* ── 3. Background canvas ─────────────────────────────────── */
#bg-canvas {
  position:fixed; inset:0; width:100%; height:100%;
  z-index:0; pointer-events:none;
}

/* ── 4. Scroll progress bar ───────────────────────────────── */
#scroll-progress {
  position:fixed; top:0; left:0; height:2px; width:0%;
  background:linear-gradient(90deg,var(--accent),var(--accent-2));
  z-index:9999; transition:width .08s linear;
}

/* ── 5. Custom cursor ─────────────────────────────────────── */
#cursor-dot {
  position:fixed; width:5px; height:5px;
  background:var(--accent); border-radius:50%;
  pointer-events:none; z-index:10000;
  transform:translate(-50%,-50%);
  transition:background .2s;
}
#cursor-ring {
  position:fixed; width:32px; height:32px;
  border:1px solid rgba(91,82,232,.5); border-radius:50%;
  pointer-events:none; z-index:9999;
  transform:translate(-50%,-50%);
  transition:width .2s, height .2s, border-color .2s;
}
body.cursor-hover #cursor-ring { width:48px; height:48px; border-color:var(--accent-2); }

/* ── 6. Loader ────────────────────────────────────────────── */
#loader {
  position:fixed; inset:0; background:#010108;
  display:flex; align-items:center; justify-content:center;
  z-index:99999; transition:opacity .5s var(--ease), visibility .5s var(--ease);
}
#loader.hide { opacity:0; visibility:hidden; pointer-events:none; }
.loader-inner { text-align:center; }
.loader-logo {
  font-family:var(--f-display); font-size:52px; font-weight:700;
  letter-spacing:-1px; margin-bottom:12px;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
  animation:logoGlow 1.4s ease-in-out infinite alternate;
}
@keyframes logoGlow {
  from { filter:drop-shadow(0 0 16px rgba(91,82,232,.5)); }
  to   { filter:drop-shadow(0 0 36px rgba(6,182,212,.7)); }
}
.loader-name {
  font-family:var(--f-mono); font-size:11px; letter-spacing:5px;
  color:var(--text-sub); margin-bottom:28px; text-transform:uppercase;
}
.loader-bar-wrap {
  width:220px; height:2px; background:rgba(255,255,255,.07);
  border-radius:2px; margin:0 auto 14px; overflow:hidden;
}
.loader-bar {
  height:100%; width:0%;
  background:linear-gradient(90deg,var(--accent),var(--accent-2));
  animation:loadBar 1.8s var(--ease) forwards;
}
@keyframes loadBar { to { width:100%; } }
.loader-status { font-size:11px; color:var(--text-dim); font-family:var(--f-mono); letter-spacing:2px; }

/* ── 7. Navbar ────────────────────────────────────────────── */
.navbar {
  position:fixed; top:0; left:0; right:0; z-index:1000;
  transition:background var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}
.navbar.scrolled {
  background:rgba(5,5,15,.82);
  backdrop-filter:blur(18px); -webkit-backdrop-filter:blur(18px);
  box-shadow:0 1px 0 var(--glass-border);
}
.nav-inner {
  max-width:1160px; margin:0 auto; padding:0 var(--space-4);
  height:64px; display:flex; align-items:center;
  justify-content:space-between; gap:var(--space-3);
}
.nav-logo {
  font-family:var(--f-display); font-size:18px; font-weight:700;
  text-decoration:none; color:var(--text); letter-spacing:-.3px;
  flex-shrink:0;
}
.logo-bracket { color:var(--accent); }

.nav-links { display:flex; align-items:center; gap:2px; }
.nav-link {
  font-size:13.5px; font-weight:400; color:var(--text-sub);
  text-decoration:none; padding:6px 12px; border-radius:var(--radius-sm);
  transition:color var(--duration), background var(--duration);
}
.nav-link:hover { color:var(--text); background:var(--glass); }
.nav-link.active { color:var(--text); }

.nav-actions { display:flex; align-items:center; gap:var(--space-1); }
.btn-resume {
  padding:7px 18px; border-radius:var(--radius-sm);
  background:linear-gradient(135deg,var(--accent),#7c6ff0);
  color:#fff; text-decoration:none; font-size:13px; font-weight:500;
  font-family:var(--f-display); letter-spacing:.2px;
  transition:opacity var(--duration), transform var(--duration);
  box-shadow:0 2px 16px rgba(91,82,232,.3);
}
.btn-resume:hover { opacity:.88; transform:translateY(-1px); }

.theme-btn {
  width:34px; height:34px; border-radius:var(--radius-sm);
  border:1px solid var(--glass-border); background:transparent;
  color:var(--text-sub); display:flex; align-items:center; justify-content:center;
  transition:border-color var(--duration), color var(--duration);
}
.theme-btn:hover { border-color:var(--accent); color:var(--text); }
.moon-icon { display:none; }
body.light-mode .sun-icon  { display:none; }
body.light-mode .moon-icon { display:block; }

.hamburger {
  display:none; flex-direction:column; justify-content:center;
  align-items:center; gap:4.5px;
  width:34px; height:34px; border:1px solid var(--glass-border);
  border-radius:var(--radius-sm); background:transparent;
}
.hamburger span {
  display:block; width:18px; height:1.5px;
  background:var(--text); border-radius:2px;
  transition:transform var(--duration), opacity var(--duration);
}
.hamburger.open span:nth-child(1) { transform:rotate(45deg) translate(4.5px,4.5px); }
.hamburger.open span:nth-child(2) { opacity:0; }
.hamburger.open span:nth-child(3) { transform:rotate(-45deg) translate(4.5px,-4.5px); }

/* ── 8. Mobile menu ───────────────────────────────────────── */
.mobile-menu {
  position:fixed; top:64px; left:0; right:0;
  background:rgba(5,5,18,.96); backdrop-filter:blur(18px);
  padding:var(--space-3) var(--space-4) var(--space-4);
  display:flex; flex-direction:column; gap:2px; z-index:998;
  border-bottom:1px solid var(--glass-border);
  transform:translateY(-105%); transition:transform .38s var(--ease);
}
body.light-mode .mobile-menu { background:rgba(246,246,254,.97); }
.mobile-menu.open { transform:translateY(0); }
.mobile-link {
  padding:12px 4px; color:var(--text-sub); text-decoration:none;
  font-size:15px; font-weight:400;
  border-bottom:1px solid var(--glass-border);
  transition:color var(--duration);
}
.mobile-link:hover, .mobile-link:focus { color:var(--accent); }
.mobile-resume { color:var(--accent); font-weight:500; border-bottom:none; }

/* ── 9. Utilities ─────────────────────────────────────────── */
.container { max-width:1160px; margin:0 auto; padding:0 var(--space-4); position:relative; z-index:1; }

/* reusable chips / tags */
.chip {
  display:inline-block; padding:3px 12px; border-radius:100px;
  background:rgba(91,82,232,.08); border:1px solid rgba(91,82,232,.14);
  font-size:12px; color:var(--text-sub); font-family:var(--f-mono);
}
.tag {
  display:inline-block; padding:3px 10px; border-radius:100px;
  background:rgba(255,255,255,.04); border:1px solid var(--glass-border);
  font-size:11.5px; color:var(--text-sub); font-family:var(--f-mono);
}
.tag-row { display:flex; flex-wrap:wrap; gap:6px; }

.badge-active {
  display:inline-block; padding:2px 10px; border-radius:100px;
  background:rgba(16,185,129,.1); color:#10b981;
  border:1px solid rgba(16,185,129,.25);
  font-size:11px; font-family:var(--f-mono); font-weight:500;
}
.badge-dot {
  display:inline-block; width:7px; height:7px; border-radius:50%;
  background:#10b981; animation:blink 2.2s ease-in-out infinite;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:.25} }

/* accent coloured text */
.accent-text {
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
}
.name-text { color:var(--accent); -webkit-text-fill-color:var(--accent); }

/* ── 10. Sections (shared layout) ────────────────────────── */
.section { padding:var(--space-8) 0; position:relative; z-index:1; }
.section-alt { background:rgba(255,255,255,.015); }

.section-header { text-align:center; margin-bottom:var(--space-6); }
.section-tag {
  display:inline-block; margin-bottom:12px;
  font-family:var(--f-mono); font-size:11px; letter-spacing:4px;
  text-transform:uppercase; color:var(--accent);
}
.section-title {
  font-family:var(--f-display); font-size:clamp(28px,4vw,44px);
  font-weight:600; line-height:1.15; letter-spacing:-.7px;
}
.section-subtitle {
  margin-top:14px; font-size:16px; color:var(--text-sub);
  max-width:520px; margin-left:auto; margin-right:auto;
}

/* ── 11. Buttons ──────────────────────────────────────────── */
.btn-primary {
  display:inline-flex; align-items:center; gap:8px;
  padding:12px 26px; border-radius:var(--radius-sm);
  background:linear-gradient(135deg,var(--accent),#7c6ff0);
  color:#fff; text-decoration:none; font-size:14px; font-weight:500;
  font-family:var(--f-display); border:none;
  box-shadow:0 2px 20px rgba(91,82,232,.3);
  transition:transform var(--duration), box-shadow var(--duration), opacity var(--duration);
}
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 6px 28px rgba(91,82,232,.45); }

.btn-ghost {
  display:inline-flex; align-items:center; gap:8px;
  padding:11px 26px; border-radius:var(--radius-sm);
  background:transparent; color:var(--text); text-decoration:none;
  font-size:14px; font-weight:500; font-family:var(--f-display);
  border:1px solid var(--glass-border);
  transition:border-color var(--duration), background var(--duration), transform var(--duration);
}
.btn-ghost:hover { border-color:var(--accent); background:rgba(91,82,232,.06); transform:translateY(-2px); }

.full-w { width:100%; justify-content:center; }

/* ── 12. Glass Card ───────────────────────────────────────── */
.glass-card {
  background:var(--glass); border:1px solid var(--glass-border);
  border-radius:var(--radius); backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  transition:transform var(--duration) var(--ease),
             border-color var(--duration) var(--ease),
             box-shadow var(--duration) var(--ease);
}
.glass-card:hover {
  transform:translateY(-4px);
  border-color:rgba(91,82,232,.25);
  box-shadow:var(--glow-accent);
}

/* ── 13. Reveal animations ────────────────────────────────── */
.reveal-up, .reveal-left, .reveal-right {
  opacity:0;
  transition:opacity var(--duration-lg) var(--ease), transform var(--duration-lg) var(--ease);
  transition-delay: var(--delay, 0s);
}
.reveal-up    { transform:translateY(32px); }
.reveal-left  { transform:translateX(-32px); }
.reveal-right { transform:translateX(32px); }
.reveal-up.visible, .reveal-left.visible, .reveal-right.visible { opacity:1; transform:translate(0); }

/* ── 14. Hero ─────────────────────────────────────────────── */
.hero-section {
  min-height:100vh;
  display:flex; flex-direction:column; justify-content:center;
  padding:100px var(--space-4) var(--space-6);
  max-width:1160px; margin:0 auto;
  position:relative; z-index:1;
}
.hero-content { max-width:700px; }

.hero-badge {
  display:inline-flex; align-items:center; gap:8px; margin-bottom:var(--space-3);
  padding:6px 16px; border-radius:100px;
  background:rgba(16,185,129,.07); border:1px solid rgba(16,185,129,.2);
  font-size:12.5px; color:#10b981; font-family:var(--f-mono);
}
.hero-title {
  font-family:var(--f-display); font-size:clamp(38px,6vw,68px);
  font-weight:700; line-height:1.08; letter-spacing:-1.5px;
  margin-bottom:var(--space-2); color:var(--text);
}
/* Typing subtitle */
.hero-subtitle { margin-bottom:var(--space-2); min-height:2rem; }
.role-text {
  font-family:var(--f-mono); font-size:clamp(15px,2vw,20px);
  color:var(--accent-2); font-weight:400; letter-spacing:.5px;
}
.hero-desc {
  font-size:16.5px; color:var(--text-sub); max-width:560px;
  margin-bottom:var(--space-4); line-height:1.8;
}
.hero-desc em { color:var(--text); font-style:normal; }
.hero-actions { display:flex; gap:12px; flex-wrap:wrap; margin-bottom:var(--space-6); }

/* Stats strip */
.hero-stats { display:flex; align-items:center; flex-wrap:wrap; gap:0; }
.stat-item { text-align:center; padding:0 var(--space-4); }
.stat-item:first-child { padding-left:0; }
.stat-num {
  display:block; font-family:var(--f-display); font-size:clamp(26px,3.5vw,36px);
  font-weight:600; letter-spacing:-.5px; color:var(--text); line-height:1;
  margin-bottom:4px;
}
.stat-label { font-size:11px; color:var(--text-dim); text-transform:uppercase; letter-spacing:1.5px; font-family:var(--f-mono); }
.stat-divider { width:1px; height:36px; background:var(--glass-border); }

/* Scroll hint */
.scroll-hint {
  position:absolute; bottom:var(--space-4); left:var(--space-4);
  display:flex; flex-direction:column; align-items:center; gap:6px;
  font-size:10px; letter-spacing:3px; color:var(--text-dim);
  text-transform:uppercase; font-family:var(--f-mono);
  animation:hintBounce 3s ease-in-out infinite;
}
.scroll-mouse { width:20px; height:30px; border:1.5px solid var(--glass-border); border-radius:10px; display:flex; justify-content:center; padding-top:5px; }
.scroll-wheel { width:3px; height:6px; background:var(--accent); border-radius:2px; animation:wheelScroll 2s ease infinite; }
@keyframes wheelScroll { 0%,100%{transform:translateY(0);opacity:1} 55%{transform:translateY(6px);opacity:0} }
@keyframes hintBounce { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-6px)} }

/* ── 15. About ────────────────────────────────────────────── */
.about-grid {
  display:grid; grid-template-columns:320px 1fr;
  gap:var(--space-7); align-items:start;
}
/* Photo */
.about-photo-wrap { position:relative; width:260px; }
.about-photo {
  width:100%; aspect-ratio:4/5; object-fit:cover;
  border-radius:20px; border:1px solid var(--glass-border);
}
.photo-badge {
  position:absolute; bottom:-12px; right:-16px;
  background:linear-gradient(135deg,var(--accent),#7c6ff0);
  padding:12px 18px; border-radius:14px; text-align:center;
  box-shadow:0 4px 24px rgba(91,82,232,.4);
}
.badge-label { display:block; font-size:10px; color:rgba(255,255,255,.7); text-transform:uppercase; letter-spacing:1px; font-family:var(--f-mono); }
.badge-value { display:block; font-family:var(--f-display); font-size:22px; font-weight:700; color:#fff; line-height:1.1; }
/* Text */
.about-lead {
  font-size:17px; color:var(--text); line-height:1.8;
  margin-bottom:var(--space-2); font-weight:400;
}
.about-lead strong { font-weight:600; }
.about-body { font-size:15px; color:var(--text-sub); line-height:1.8; margin-bottom:var(--space-4); }
.about-highlights { display:flex; flex-direction:column; gap:var(--space-2); margin-bottom:var(--space-4); }
.highlight-row { display:flex; gap:var(--space-2); align-items:flex-start; }
.hl-icon { font-size:18px; flex-shrink:0; margin-top:2px; }
.highlight-row strong { display:block; font-size:14px; font-weight:600; color:var(--text); margin-bottom:1px; }
.highlight-row span { font-size:13px; color:var(--text-sub); }
.about-actions { display:flex; gap:12px; flex-wrap:wrap; }

/* ── 16. Education — Timeline ─────────────────────────────── */
.timeline {
  max-width:760px; margin:0 auto;
  display:flex; flex-direction:column; gap:0;
  padding-left:var(--space-4); position:relative;
}
.timeline::before {
  content:''; position:absolute; left:0; top:24px; bottom:24px; width:2px;
  background:linear-gradient(to bottom, var(--accent), var(--accent-2), transparent);
}
.tl-item { position:relative; padding-bottom:var(--space-5); }
.tl-item:last-child { padding-bottom:0; }
.tl-dot {
  position:absolute; left:calc(-1 * var(--space-4) - 5px); top:26px;
  width:12px; height:12px; border-radius:50%;
  background:var(--accent); border:2.5px solid var(--bg);
  box-shadow:0 0 0 3px rgba(91,82,232,.3);
}
.tl-card { padding:var(--space-3) var(--space-4); }
.tl-card-header {
  display:flex; justify-content:space-between; align-items:flex-start;
  gap:var(--space-2); gap:var(--space-2); margin-bottom:12px; flex-wrap:wrap;
}
.tl-degree { font-family:var(--f-display); font-size:17px; font-weight:600; margin-bottom:4px; }
.tl-institute { font-size:13.5px; color:var(--accent); font-weight:500; }
.tl-right { text-align:right; flex-shrink:0; }
.tl-period { display:block; font-size:12px; color:var(--text-sub); font-family:var(--f-mono); margin-bottom:6px; }
.tl-chips { display:flex; gap:8px; flex-wrap:wrap; margin-bottom:10px; }
.tl-desc { font-size:14px; color:var(--text-sub); line-height:1.75; }

/* ── 17. Experience ───────────────────────────────────────── */
.exp-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(320px,1fr)); gap:var(--space-3); }
.exp-card { padding:var(--space-4); }
.exp-top { display:flex; justify-content:space-between; align-items:flex-start; margin-bottom:var(--space-2); }
.exp-icon-box {
  width:44px; height:44px; border-radius:12px;
  background:rgba(91,82,232,.08); border:1px solid rgba(91,82,232,.14);
  display:flex; align-items:center; justify-content:center; font-size:20px;
}
.exp-meta { text-align:right; }
.exp-type { display:block; font-size:10.5px; font-family:var(--f-mono); letter-spacing:1.5px; color:var(--accent); text-transform:uppercase; margin-bottom:4px; }
.exp-period { font-size:12px; color:var(--text-dim); font-family:var(--f-mono); }
.exp-role { font-family:var(--f-display); font-size:18px; font-weight:600; margin-bottom:4px; }
.exp-company { font-size:13.5px; color:var(--accent-2); font-weight:500; margin-bottom:var(--space-2); }
.exp-bullets { padding-left:18px; display:flex; flex-direction:column; gap:6px; margin-bottom:var(--space-2); list-style:disc; }
.exp-bullets li { font-size:14px; color:var(--text-sub); line-height:1.7; }

/* ── 18. Projects ─────────────────────────────────────────── */
.filter-bar {
  display:flex; gap:8px; flex-wrap:wrap;
  justify-content:center; margin-bottom:var(--space-5);
}
.filter-btn {
  padding:8px 20px; border-radius:100px; border:1px solid var(--glass-border);
  background:transparent; color:var(--text-sub); font-size:13px; font-weight:500;
  font-family:var(--f-display); cursor:pointer;
  transition:border-color var(--duration), background var(--duration), color var(--duration);
}
.filter-btn:hover { border-color:rgba(91,82,232,.4); color:var(--text); }
.filter-btn.active { border-color:var(--accent); background:rgba(91,82,232,.1); color:var(--text); }
.projects-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:var(--space-3); }
.project-card { overflow:hidden; cursor:pointer; }
.project-card.hidden { display:none; }
.project-img-wrap { position:relative; height:192px; overflow:hidden; }
.project-img { width:100%; height:100%; object-fit:cover; transition:transform .5s var(--ease); }
.project-card:hover .project-img { transform:scale(1.05); }
.project-overlay {
  position:absolute; inset:0; background:rgba(5,5,20,.72);
  display:flex; align-items:center; justify-content:center;
  opacity:0; transition:opacity var(--duration); backdrop-filter:blur(3px);
}
.project-card:hover .project-overlay { opacity:1; }
.overlay-btn {
  padding:9px 22px; border-radius:var(--radius-sm);
  background:var(--accent); color:#fff; border:none; cursor:pointer;
  font-size:13px; font-weight:600; font-family:var(--f-display);
  transition:transform .2s;
}
.overlay-btn:hover { transform:scale(1.04); }
.project-body { padding:var(--space-3); }
.project-cat { font-size:10.5px; font-family:var(--f-mono); letter-spacing:2px; color:var(--accent); text-transform:uppercase; display:block; margin-bottom:8px; }
.project-title { font-family:var(--f-display); font-size:17px; font-weight:600; margin-bottom:6px; }
.project-desc { font-size:13.5px; color:var(--text-sub); line-height:1.7; margin-bottom:var(--space-2); }

/* ── 19. Skills (redesigned) ──────────────────────────────── */
.skills-grid {
  display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:var(--space-3);
  margin-bottom:var(--space-4);
}
.skill-group { padding:var(--space-3) var(--space-4); }
.skill-group-header { display:flex; align-items:center; gap:10px; margin-bottom:var(--space-2); }
.skill-icon { font-size:20px; }
.skill-group-title { font-family:var(--f-display); font-size:15px; font-weight:600; }
.skill-chips { display:flex; flex-wrap:wrap; gap:7px; margin-bottom:var(--space-2); }

/* Skill chip levels */
.skill-chip {
  display:inline-flex; align-items:center; gap:5px;
  padding:5px 13px; border-radius:100px;
  font-size:12.5px; font-family:var(--f-body); font-weight:500;
  border:1px solid; transition:transform .15s;
}
.skill-chip:hover { transform:translateY(-1px); }
/* dot indicator inside chip */
.skill-chip::before { content:''; width:6px; height:6px; border-radius:50%; flex-shrink:0; }

.skill-expert {
  background:rgba(91,82,232,.09);  border-color:rgba(91,82,232,.2);  color:var(--text);
}
.skill-expert::before   { background:var(--accent); }

.skill-proficient {
  background:rgba(6,182,212,.07);  border-color:rgba(6,182,212,.18); color:var(--text-sub);
}
.skill-proficient::before { background:var(--accent-2); }

.skill-familiar {
  background:rgba(255,255,255,.03); border-color:var(--glass-border); color:var(--text-dim);
}
.skill-familiar::before { background:var(--text-dim); }

/* Inline legend (inside first card) */
.skill-legend {
  display:flex; align-items:center; gap:8px; flex-wrap:wrap;
  font-size:11px; color:var(--text-dim); font-family:var(--f-mono);
  padding-top:var(--space-2); border-top:1px solid var(--glass-border);
}
.legend-dot { width:6px; height:6px; border-radius:50%; display:inline-block; }
.legend-dot.expert     { background:var(--accent); }
.legend-dot.proficient { background:var(--accent-2); }
.legend-dot.familiar   { background:var(--text-dim); }

/* Global legend below the grid */
.skills-legend-global {
  display:flex; align-items:center; gap:12px; justify-content:center; flex-wrap:wrap;
  font-size:12px; color:var(--text-sub); font-family:var(--f-mono);
  padding:var(--space-2) var(--space-3); border-radius:var(--radius-sm);
  background:var(--glass); border:1px solid var(--glass-border); width:fit-content; margin:0 auto;
}

/* ── 20. Certifications ───────────────────────────────────── */
.certs-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(260px,1fr)); gap:var(--space-3); }
.cert-card { overflow:hidden; cursor:pointer; }
.cert-img-wrap { position:relative; height:160px; background:#000; }
.cert-thumb { width:100%; height:100%; object-fit:contain; padding:10px; transition:transform .4s var(--ease); }
.cert-card:hover .cert-thumb { transform:scale(1.04); }
.cert-overlay {
  position:absolute; inset:0; background:rgba(91,82,232,.55);
  display:flex; align-items:center; justify-content:center;
  color:#fff; font-size:13px; font-weight:500; font-family:var(--f-display);
  opacity:0; cursor:pointer; transition:opacity var(--duration);
}
.cert-card:hover .cert-overlay { opacity:1; }
.cert-info { padding:16px 18px; }
.cert-issuer {
  display:inline-block; padding:3px 10px; border-radius:100px;
  font-size:10.5px; font-weight:600; font-family:var(--f-mono);
  letter-spacing:1px; text-transform:uppercase; margin-bottom:7px;
}
.cert-google     { background:rgba(66,133,244,.1);   color:#4285F4; }
.cert-ibm        { background:rgba(0,98,170,.1);     color:#0062AA; }
.cert-meta       { background:rgba(24,119,242,.1);   color:#1877F2; }
.cert-microsoft  { background:rgba(0,164,239,.1);    color:#00A4EF; }
.cert-coursera   { background:rgba(0,86,179,.1);     color:#0056B3; }
.cert-title { font-family:var(--f-display); font-size:15px; font-weight:600; }

/* ── 21. Publications ─────────────────────────────────────── */
.pub-list { display:flex; flex-direction:column; gap:var(--space-3); max-width:840px; margin:0 auto; }
.pub-card { display:flex; overflow:hidden; padding:0; }
.pub-accent { width:3px; background:linear-gradient(to bottom,var(--accent),#7c6ff0); flex-shrink:0; }
.pub-accent-cyan { background:linear-gradient(to bottom,var(--accent-2),#22d3ee); }
.pub-body { padding:var(--space-3) var(--space-4); flex:1; }
.pub-meta-row { display:flex; align-items:center; gap:8px; flex-wrap:wrap; margin-bottom:12px; }
.pub-badge {
  padding:2px 10px; border-radius:100px;
  font-size:10.5px; font-weight:600; font-family:var(--f-mono); text-transform:uppercase; letter-spacing:1px;
}
.pub-springer  { background:rgba(245,158,11,.1);  color:var(--accent-warm); }
.pub-published { background:rgba(16,185,129,.08); color:#10b981; }
.pub-presented { background:rgba(6,182,212,.08);  color:var(--accent-2); }
.pub-year { font-size:12px; color:var(--text-dim); font-family:var(--f-mono); margin-left:auto; }
.pub-title { font-family:var(--f-display); font-size:17px; font-weight:600; margin-bottom:6px; line-height:1.4; }
.pub-venue { font-size:13px; color:var(--accent); font-weight:500; margin-bottom:10px; }
.pub-abstract { font-size:14px; color:var(--text-sub); line-height:1.75; margin-bottom:10px; }
.pub-authors { font-size:12.5px; color:var(--text-dim); font-style:italic; }

/* ── 22. Contact ──────────────────────────────────────────── */
.contact-layout { display:grid; grid-template-columns:1fr 1fr; gap:var(--space-4); max-width:880px; margin:0 auto; }
.contact-links { display:flex; flex-direction:column; gap:var(--space-2); }
.contact-link {
  display:flex; align-items:center; gap:var(--space-2);
  padding:var(--space-2) var(--space-3); text-decoration:none; border-radius:var(--radius);
  transition:border-color var(--duration), background var(--duration), transform var(--duration);
}
.contact-link:hover { border-color:var(--accent); background:rgba(91,82,232,.05); transform:translateX(4px); }
.contact-link-icon {
  width:40px; height:40px; border-radius:10px; flex-shrink:0;
  display:flex; align-items:center; justify-content:center;
}
.email-icon    { background:rgba(91,82,232,.1);   color:var(--accent); }
.linkedin-icon { background:rgba(0,119,181,.1);   color:#0077B5; }
.github-icon   { background:rgba(255,255,255,.06); color:var(--text); }
.contact-link-info { flex:1; min-width:0; }
.cl-label { display:block; font-size:10.5px; color:var(--text-dim); text-transform:uppercase; letter-spacing:1px; font-family:var(--f-mono); margin-bottom:2px; }
.cl-value { display:block; font-size:13px; color:var(--text); font-weight:500; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.cl-arrow { color:var(--text-dim); flex-shrink:0; transition:transform var(--duration); }
.contact-link:hover .cl-arrow { transform:translateX(3px); color:var(--accent); }

.contact-cta { padding:var(--space-4); position:relative; overflow:hidden; }
.cta-inner { position:relative; z-index:1; }
.cta-status { display:inline-flex; align-items:center; gap:8px; font-size:11px; font-family:var(--f-mono); color:#10b981; letter-spacing:1px; margin-bottom:12px; }
.cta-heading { font-family:var(--f-display); font-size:20px; font-weight:600; margin-bottom:10px; }
.cta-body { font-size:14px; color:var(--text-sub); line-height:1.75; margin-bottom:var(--space-2); }
.cta-chips { display:flex; gap:8px; flex-wrap:wrap; margin-bottom:var(--space-3); }

/* ── 23. Footer ───────────────────────────────────────────── */
.site-footer {
  position:relative; z-index:1;
  border-top:1px solid var(--glass-border);
  padding:var(--space-5) 0 var(--space-4);
}
.footer-inner {
  display:grid; grid-template-columns:1fr auto 1fr;
  align-items:center; gap:var(--space-3);
}
.footer-logo { font-family:var(--f-display); font-size:20px; font-weight:700; display:block; margin-bottom:6px; }
.footer-brand p { font-size:12.5px; color:var(--text-dim); }
.footer-links { display:flex; gap:var(--space-3); justify-content:center; flex-wrap:wrap; }
.footer-links a { font-size:13px; color:var(--text-sub); text-decoration:none; transition:color var(--duration); }
.footer-links a:hover { color:var(--accent); }
.footer-copy { font-size:11.5px; color:var(--text-dim); text-align:right; font-family:var(--f-mono); }

/* ── 24. Back-to-top ──────────────────────────────────────── */
.back-top {
  position:fixed; bottom:var(--space-4); right:var(--space-4);
  width:40px; height:40px; border-radius:10px;
  background:rgba(91,82,232,.12); border:1px solid rgba(91,82,232,.25);
  color:var(--accent); display:flex; align-items:center; justify-content:center;
  opacity:0; transform:translateY(12px);
  transition:opacity var(--duration), transform var(--duration), background var(--duration);
  z-index:500;
}
.back-top.visible { opacity:1; transform:translateY(0); }
.back-top:hover { background:rgba(91,82,232,.25); }

/* ── 25. Modal ────────────────────────────────────────────── */
.modal-overlay {
  position:fixed; inset:0; background:rgba(0,0,8,.88);
  backdrop-filter:blur(10px); display:flex;
  align-items:center; justify-content:center;
  z-index:9998; opacity:0; pointer-events:none;
  transition:opacity var(--duration) var(--ease); padding:20px;
}
.modal-overlay.active { opacity:1; pointer-events:all; }
.modal-box {
  background:var(--bg-2); border:1px solid var(--glass-border);
  border-radius:18px; max-width:640px; width:100%; position:relative;
  transform:scale(.94) translateY(16px); transition:transform .32s var(--ease);
  max-height:90vh; overflow-y:auto;
}
.modal-overlay.active .modal-box { transform:scale(1) translateY(0); }
.modal-close {
  position:absolute; top:14px; right:14px;
  width:32px; height:32px; border-radius:8px;
  background:rgba(255,255,255,.06); border:1px solid var(--glass-border);
  color:var(--text-sub); cursor:pointer;
  display:flex; align-items:center; justify-content:center;
  transition:background var(--duration), color var(--duration); z-index:5;
}
.modal-close:hover { background:rgba(255,107,107,.15); color:#f87171; }
.modal-img { width:100%; max-height:360px; object-fit:contain; background:#000; display:block; }
.modal-info { padding:var(--space-3) var(--space-4) var(--space-4); }
.modal-title { font-family:var(--f-display); font-size:20px; font-weight:600; margin-bottom:8px; }
.modal-desc { font-size:14px; color:var(--text-sub); line-height:1.75; margin-bottom:var(--space-2); }
.modal-tag-row { display:flex; flex-wrap:wrap; gap:7px; }

/* ── 26. Light Mode ───────────────────────────────────────── */
body.light-mode {
  --bg:           #f6f6fd;
  --bg-2:         #ededfb;
  --bg-3:         #e4e4f8;
  --glass:        rgba(255,255,255,0.72);
  --glass-border: rgba(91,82,232,0.12);
  --glass-hover:  rgba(255,255,255,0.9);
  --text:         #12121e;
  --text-sub:     #4a4a72;
  --text-dim:     #8888aa;
}
body.light-mode { background:var(--bg); color:var(--text); }
body.light-mode .section-alt { background:rgba(91,82,232,.03); }
body.light-mode .navbar.scrolled { background:rgba(246,246,253,.88); box-shadow:0 1px 0 rgba(91,82,232,.1); }
body.light-mode .glass-card { background:rgba(255,255,255,.8); box-shadow:0 2px 20px rgba(91,82,232,.06); }
body.light-mode .glass-card:hover { background:rgba(255,255,255,.95); box-shadow:0 6px 32px rgba(91,82,232,.12); }
body.light-mode .cert-img-wrap { background:#f0f0f0; }
body.light-mode .mobile-menu { background:rgba(246,246,253,.97); }
body.light-mode .modal-box { background:#ededfb; }
body.light-mode #bg-canvas { opacity:.25; }
body.light-mode .skills-legend-global { background:rgba(255,255,255,.7); }
body.light-mode .skill-familiar { background:rgba(0,0,0,.03); border-color:rgba(0,0,0,.1); color:var(--text-dim); }
body.light-mode .about-photo { border-color:rgba(91,82,232,.15); }
body.light-mode .tl-dot { border-color:var(--bg); }

/* ── 27. Responsive ───────────────────────────────────────── */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns:240px 1fr; gap:var(--space-5); }
}
@media (max-width: 900px) {
  .nav-links { display:none; }
  .btn-resume { display:none; }
  .hamburger { display:flex; }
  .about-grid { grid-template-columns:1fr; }
  .about-photo-wrap { width:200px; margin:0 auto; }
  .about-photo-col { display:flex; justify-content:center; }
  .contact-layout { grid-template-columns:1fr; }
  .footer-inner { grid-template-columns:1fr; text-align:center; }
  .footer-copy { text-align:center; }
  .timeline { padding-left:var(--space-3); }
  .tl-dot { left:calc(-1 * var(--space-3) - 5px); }
}
@media (max-width: 700px) {
  .section { padding:var(--space-6) 0; }
  .container { padding:0 var(--space-3); }
  .hero-section { padding-top:90px; padding-left:var(--space-3); padding-right:var(--space-3); }
  .hero-title { letter-spacing:-1px; }
  .hero-stats { flex-wrap:wrap; }
  .stat-divider { display:none; }
  .stat-item { padding:6px var(--space-3); }
  .projects-grid { grid-template-columns:1fr; }
  .certs-grid { grid-template-columns:repeat(2,1fr); }
  .skills-grid { grid-template-columns:1fr; }
  .exp-grid { grid-template-columns:1fr; }
  .pub-list { gap:var(--space-2); }
  .scroll-hint { display:none; }
}
@media (max-width: 480px) {
  .hero-title { font-size:34px; }
  .section-title { font-size:26px; }
  .certs-grid { grid-template-columns:1fr; }
  .filter-bar { gap:6px; }
  .filter-btn { padding:7px 14px; font-size:12px; }
  .back-top { bottom:var(--space-2); right:var(--space-2); }
}