/* ============================================================
   MD. ABBAS UDDIN — PORTFOLIO STYLESHEET
   Pure CSS3 · no frameworks · premium dark SaaS aesthetic
   ------------------------------------------------------------
   TABLE OF CONTENTS
   01. Custom properties (color, type, spacing)
   02. Reset & base
   03. Typography utilities
   04. Layout primitives (container, section)
   05. Buttons & links
   06. Header / navigation
   07. Cursor · mouse glow · progress · loader
   08. Hero
   09. About
   10. Experience / timeline
   11. Skills
   12. Featured projects
   13. Research & certifications
   14. Contact
   15. Footer
   16. Reveal / animation states
   17. Responsive breakpoints
   18. Reduced motion
============================================================ */

/* ----------------------------------------------------------
   01. CUSTOM PROPERTIES
---------------------------------------------------------- */
:root {
  /* Color system (per spec) */
  --bg:       #0B0F14;   /* background */
  --surface:  #111827;   /* surface / cards */
  --primary:  #4F46E5;   /* indigo */
  --accent:   #22C55E;   /* green */
  --text:     #F8FAFC;   /* text */
  --muted:    #94A3B8;   /* muted text */

  --border:        rgba(248, 250, 252, 0.10);
  --border-strong: rgba(248, 250, 252, 0.18);
  --surface-2:     #0F1623;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;

  /* Fluid spacing scale */
  --space-xs: clamp(0.5rem, 1vw, 0.75rem);
  --space-sm: clamp(0.75rem, 1.5vw, 1.25rem);
  --space-md: clamp(1.5rem, 3vw, 2.5rem);
  --space-lg: clamp(3rem, 6vw, 6rem);
  --space-xl: clamp(5rem, 11vw, 11rem);

  /* Layout */
  --container: 1280px;
  --gutter: clamp(1.25rem, 5vw, 4rem);
  --radius: 16px;
  --radius-sm: 10px;

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ----------------------------------------------------------
   02. RESET & BASE
---------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-weight: 400;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

/* ----------------------------------------------------------
   03. TYPOGRAPHY UTILITIES
---------------------------------------------------------- */
h1, h2, h3, h4 { font-weight: 800; line-height: 1.05; letter-spacing: -0.02em; }
.accent-text { color: var(--accent); }
em { font-style: normal; color: var(--text); font-weight: 600; }

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

.section { padding-block: var(--space-xl); position: relative; }

/* Subtle alternating surface tint for rhythm */
.experience, .work { background: linear-gradient(180deg, var(--bg), var(--surface-2)); }

/* Section header */
.section__head {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}
.section__index {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  color: var(--border);
  line-height: 1;
}
.section__tag {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.25em;
  color: var(--accent);
  font-weight: 600;
}
.section__title {
  font-size: clamp(2.2rem, 6vw, 4.6rem);
  max-width: 16ch;
  margin-bottom: var(--space-lg);
}

/* ----------------------------------------------------------
   05. BUTTONS & LINKS
---------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  padding: 0.95em 1.7em;
  border-radius: 100px;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: transform 0.4s var(--ease), background 0.4s var(--ease), color 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s var(--ease);
  will-change: transform;
}
.btn svg { transition: transform 0.4s var(--ease); }
.btn:hover svg { transform: translateX(4px); }
.btn--accent:hover svg { transform: translateY(3px); }

.btn--primary { background: var(--primary); color: #fff; }
.btn--primary:hover { transform: translateY(-3px); box-shadow: 0 16px 44px -14px var(--primary); }

.btn--accent { background: var(--accent); color: #062b14; }
.btn--accent:hover { transform: translateY(-3px); box-shadow: 0 16px 44px -14px var(--accent); }

.btn--ghost { border: 1px solid var(--border-strong); color: var(--text); }
.btn--ghost:hover { background: rgba(248,250,252,0.06); transform: translateY(-3px); }

/* Highlighted "Play the game" button — glowing, attention-grabbing */
.btn--game {
  position: relative;
  color: #05060a;
  font-weight: 700;
  background: linear-gradient(110deg, #38e8ff, #b66bff);
  background-size: 200% 100%;
  box-shadow: 0 0 0 1px rgba(56,232,255,0.4), 0 10px 34px -10px rgba(56,232,255,0.6);
  animation: gameGlow 3.2s var(--ease) infinite, gameSheen 5s linear infinite;
}
.btn--game:hover { transform: translateY(-3px); }
.btn--game .btn__ping {
  width: 0.55em; height: 0.55em; border-radius: 50%;
  background: #05060a; box-shadow: 0 0 0 0 rgba(5,6,10,0.5);
  animation: gamePing 1.6s ease-out infinite;
}
@keyframes gameGlow {
  0%, 100% { box-shadow: 0 0 0 1px rgba(56,232,255,0.4), 0 10px 34px -10px rgba(56,232,255,0.55); }
  50%      { box-shadow: 0 0 0 1px rgba(182,107,255,0.55), 0 14px 46px -8px rgba(182,107,255,0.75); }
}
@keyframes gameSheen { to { background-position: -200% 0; } }
@keyframes gamePing {
  0%   { box-shadow: 0 0 0 0 rgba(5,6,10,0.5); }
  70%  { box-shadow: 0 0 0 7px rgba(5,6,10,0); }
  100% { box-shadow: 0 0 0 0 rgba(5,6,10,0); }
}

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

/* ----------------------------------------------------------
   06. HEADER / NAVIGATION
---------------------------------------------------------- */
.header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  padding-block: 1.2rem;
  transition: background 0.5s var(--ease), padding 0.5s var(--ease), border-color 0.5s var(--ease);
  border-bottom: 1px solid transparent;
}
.header.is-scrolled {
  background: rgba(11, 15, 20, 0.72);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  padding-block: 0.8rem;
  border-bottom-color: var(--border);
}
.header__inner { display: flex; align-items: center; justify-content: space-between; }

.logo {
  display: flex; align-items: center; gap: 0.55em;
  font-weight: 800; font-size: 1.15rem; letter-spacing: -0.02em;
}
.logo__mark {
  display: grid; place-items: center;
  width: 2.1em; height: 2.1em;
  border-radius: 50%;
  background: var(--primary); color: #fff;
  font-size: 0.85em; font-weight: 800;
}

.nav__list { display: flex; align-items: center; gap: clamp(1.1rem, 2.2vw, 2.2rem); }
.nav__link {
  font-size: 0.92rem; font-weight: 500; color: var(--muted);
  position: relative; transition: color 0.3s var(--ease);
}
.nav__link::after {
  content: ''; position: absolute; left: 0; bottom: -4px;
  width: 100%; height: 2px; background: var(--accent);
  transform: scaleX(0); transform-origin: right;
  transition: transform 0.4s var(--ease);
}
.nav__link:hover, .nav__link.is-active { color: var(--text); }
.nav__link:hover::after, .nav__link.is-active::after { transform: scaleX(1); transform-origin: left; }
.nav__link--cta {
  border: 1px solid var(--border-strong); padding: 0.5em 1.2em;
  border-radius: 100px; color: var(--text);
}
.nav__link--cta::after { display: none; }
.nav__link--cta:hover { background: var(--primary); border-color: var(--primary); }

/* Hamburger */
.nav-toggle { display: none; width: 44px; height: 44px; position: relative; z-index: 110; }
.nav-toggle span {
  position: absolute; left: 11px; width: 22px; height: 2px;
  background: var(--text); border-radius: 2px;
  transition: transform 0.4s var(--ease), opacity 0.3s var(--ease);
}
.nav-toggle span:nth-child(1) { top: 18px; }
.nav-toggle span:nth-child(2) { top: 25px; }
.nav-toggle.is-open span:nth-child(1) { transform: translateY(3.5px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { transform: translateY(-3.5px) rotate(-45deg); }

/* ----------------------------------------------------------
   07. CURSOR · MOUSE GLOW · PROGRESS · LOADER
---------------------------------------------------------- */
.cursor {
  position: fixed; top: 0; left: 0;
  width: 38px; height: 38px;
  border: 1.5px solid var(--accent);
  border-radius: 50%;
  pointer-events: none; z-index: 9999;
  display: grid; place-items: center;
  transform: translate(-50%, -50%);
  transition: width 0.3s var(--ease), height 0.3s var(--ease), background 0.3s var(--ease), opacity 0.3s var(--ease), border-color 0.3s var(--ease);
  opacity: 0;
}
.cursor--dot { width: 6px; height: 6px; background: var(--accent); border: none; transition: opacity 0.3s var(--ease); }
body.cursor-ready .cursor { opacity: 1; }
.cursor.is-hover { width: 60px; height: 60px; background: rgba(79,70,229,0.18); border-color: var(--primary); }

/* Mouse-follow glow blob */
.mouse-glow {
  position: fixed; top: 0; left: 0; z-index: 1;
  width: 480px; height: 480px; border-radius: 50%;
  background: radial-gradient(circle, rgba(79,70,229,0.16), transparent 65%);
  pointer-events: none; transform: translate(-50%, -50%);
  opacity: 0; transition: opacity 0.6s ease;
  mix-blend-mode: screen;
}
body.cursor-ready .mouse-glow { opacity: 1; }

.progress-bar {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  z-index: 200; transition: width 0.1s linear;
}

.loader {
  position: fixed; inset: 0; z-index: 9000;
  background: var(--bg);
  display: grid; place-items: center;
  transition: transform 0.9s var(--ease);
}
.loader.is-done { transform: translateY(-100%); }
.loader__inner { text-align: center; }
.loader__count {
  display: block; font-weight: 900;
  font-size: clamp(4rem, 18vw, 11rem); line-height: 1;
  background: linear-gradient(120deg, var(--text), var(--primary));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.loader__label { font-size: 0.8rem; letter-spacing: 0.3em; text-transform: uppercase; color: var(--muted); }

/* ----------------------------------------------------------
   08. HERO
---------------------------------------------------------- */
.hero {
  min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  position: relative; overflow: hidden;
  padding-block: 8rem 4rem;
}
.hero__bg { position: absolute; inset: 0; z-index: 0; overflow: hidden; }
.hero__orb {
  position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.5;
  will-change: transform;
}
.hero__orb--1 { width: 46vw; height: 46vw; top: -12%; right: -8%; background: radial-gradient(circle, rgba(79,70,229,0.55), transparent 70%); }
.hero__orb--2 { width: 38vw; height: 38vw; bottom: -10%; left: -6%; background: radial-gradient(circle, rgba(34,197,94,0.35), transparent 70%); }
.hero__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 75%);
  opacity: 0.6;
}
.hero__inner { position: relative; z-index: 2; }

.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 0.6em;
  font-size: 0.85rem; letter-spacing: 0.04em;
  color: var(--muted); margin-bottom: var(--space-md);
  padding: 0.5em 1em; border: 1px solid var(--border); border-radius: 100px;
  background: rgba(255,255,255,0.02);
}
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 0 rgba(34,197,94,0.6); animation: pulse 2.4s infinite; }
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(34,197,94,0.5); }
  70% { box-shadow: 0 0 0 9px rgba(34,197,94,0); }
  100% { box-shadow: 0 0 0 0 rgba(34,197,94,0); }
}

.hero__title {
  font-size: clamp(2.6rem, 9vw, 7.5rem);
  font-weight: 900; letter-spacing: -0.03em;
  margin-bottom: var(--space-md);
}
.hero__title .line { display: block; overflow: hidden; }
.hero__title .line__inner { display: block; transform: translateY(110%); }
.hero__title .line--accent .line__inner {
  background: linear-gradient(110deg, var(--accent), var(--primary));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}

.hero__desc {
  max-width: 56ch; font-size: clamp(1rem, 1.6vw, 1.25rem);
  color: var(--muted); margin-bottom: var(--space-md);
}
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--space-sm); }

/* Scroll indicator */
.scroll-indicator {
  position: absolute; bottom: 5.5rem; right: var(--gutter); z-index: 2;
  display: flex; flex-direction: column; align-items: center; gap: 0.8rem;
  writing-mode: vertical-rl;
  font-size: 0.72rem; letter-spacing: 0.25em; text-transform: uppercase; color: var(--muted);
}
.scroll-indicator__line { width: 1px; height: 60px; background: var(--border); position: relative; overflow: hidden; }
.scroll-indicator__line span { position: absolute; top: 0; left: 0; width: 100%; height: 40%; background: var(--accent); animation: scrollLine 2s var(--ease) infinite; }
@keyframes scrollLine { 0% { transform: translateY(-100%); } 100% { transform: translateY(250%); } }

/* Marquee */
.marquee {
  position: absolute; bottom: 0; left: 0; width: 100%; z-index: 1;
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  padding-block: 1rem; overflow: hidden; background: rgba(0,0,0,0.25);
}
.marquee__track {
  display: flex; gap: 2rem; align-items: center; width: max-content;
  animation: marquee 30s linear infinite;
  font-weight: 600; font-size: clamp(0.9rem, 1.4vw, 1.15rem);
  color: var(--muted); white-space: nowrap;
}
.marquee__track span:nth-child(even) { color: var(--primary); }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ----------------------------------------------------------
   09. ABOUT
---------------------------------------------------------- */
.about__statement {
  font-size: clamp(1.8rem, 4.5vw, 3.4rem);
  font-weight: 800; line-height: 1.12; letter-spacing: -0.02em;
  max-width: 20ch; margin-bottom: var(--space-lg);
}
.about__grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: var(--space-lg); align-items: start; }
.about__text p { font-size: clamp(1.02rem, 1.6vw, 1.2rem); color: var(--muted); margin-bottom: var(--space-sm); max-width: 52ch; }
.about__text p strong { color: var(--text); font-weight: 600; }

.about__focus { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: var(--space-sm); }
.about__focus li {
  font-size: 0.85rem; font-weight: 500; padding: 0.5em 1.1em;
  border: 1px solid var(--border-strong); border-radius: 100px; color: var(--text);
}

.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-sm); }
.stat {
  padding: var(--space-md); border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); transition: transform 0.4s var(--ease), border-color 0.4s var(--ease);
}
.stat:hover { transform: translateY(-4px); border-color: var(--primary); }
.stat--wide { grid-column: 1 / -1; }
.stat__num {
  display: block; font-weight: 900; font-size: clamp(2.2rem, 5vw, 3.4rem); line-height: 1;
  background: linear-gradient(120deg, var(--text), var(--accent));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.stat__label { font-size: 0.85rem; color: var(--muted); margin-top: 0.5rem; display: block; }

/* ----------------------------------------------------------
   10. EXPERIENCE / TIMELINE
---------------------------------------------------------- */
.timeline { position: relative; padding-left: clamp(1.5rem, 4vw, 3rem); }
.timeline__line { position: absolute; left: 0; top: 0; bottom: 0; width: 2px; background: var(--border); }
.timeline__progress { position: absolute; top: 0; left: 0; width: 100%; height: 0%; background: linear-gradient(var(--primary), var(--accent)); transition: height 0.2s linear; }

.timeline__item { position: relative; padding-bottom: var(--space-lg); padding-left: var(--space-md); }
.timeline__item:last-child { padding-bottom: 0; }
.timeline__dot {
  position: absolute; left: calc(clamp(1.5rem, 4vw, 3rem) * -1 - 6px); top: 6px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--bg); border: 3px solid var(--primary);
}
.timeline__header { margin-bottom: var(--space-md); }
.timeline__year { font-size: 0.8rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); font-weight: 600; }
.timeline__role { font-size: clamp(1.5rem, 3.5vw, 2.4rem); margin: 0.4rem 0 0.2rem; }
.timeline__company { font-size: 1rem; color: var(--muted); }

.timeline__projects { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-sm); }
.exp-card {
  padding: var(--space-md); border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); transition: transform 0.4s var(--ease), border-color 0.4s var(--ease), background 0.4s var(--ease);
}
.exp-card:hover { transform: translateY(-4px); border-color: var(--accent); }
.exp-card__title { font-size: 1.3rem; margin-bottom: 0.3rem; }
.exp-card__sub { font-size: 0.95rem; color: var(--muted); margin-bottom: var(--space-sm); }
.exp-card__feat { font-size: 0.88rem; color: var(--muted); margin-top: var(--space-sm); }
.exp-card__feat span { color: var(--accent); font-weight: 600; }

/* Shared tag pills */
.tags { display: flex; flex-wrap: wrap; gap: 0.45rem; }
.tags li {
  font-size: 0.72rem; letter-spacing: 0.02em; padding: 0.4em 0.85em;
  border: 1px solid var(--border); border-radius: 100px; color: var(--muted);
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease);
}
.exp-card:hover .tags li, .project:hover .tags li { border-color: var(--border-strong); }

/* ----------------------------------------------------------
   11. SKILLS
---------------------------------------------------------- */
.skills__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-sm); }
.skill-cat {
  padding: var(--space-md); border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); transition: transform 0.4s var(--ease), border-color 0.4s var(--ease);
}
.skill-cat:hover { transform: translateY(-4px); border-color: var(--primary); }
.skill-cat--wide { grid-column: span 2; }
.skill-cat__title { font-size: 1.25rem; margin-bottom: var(--space-md); color: var(--text); }

.skill { display: grid; grid-template-columns: 1fr 1.4fr; align-items: center; gap: 1rem; margin-bottom: 0.9rem; }
.skill > span:first-child { font-size: 0.9rem; color: var(--muted); }
.skill__bar { height: 6px; border-radius: 6px; background: var(--border); overflow: hidden; }
.skill__bar i { display: block; height: 100%; width: 0; border-radius: 6px; background: linear-gradient(90deg, var(--primary), var(--accent)); transition: width 1.3s var(--ease); }

.chips { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.chips li {
  font-size: 0.85rem; padding: 0.55em 1.1em;
  border: 1px solid var(--border-strong); border-radius: 100px; color: var(--text);
  transition: background 0.3s var(--ease), color 0.3s var(--ease);
}
.chips li:hover { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ----------------------------------------------------------
   12. FEATURED PROJECTS
---------------------------------------------------------- */
.work__list { border-top: 1px solid var(--border); }
.project {
  display: grid; grid-template-columns: auto 1fr auto;
  gap: var(--space-md); align-items: center;
  padding-block: var(--space-md);
  border-bottom: 1px solid var(--border);
  position: relative; transition: padding 0.5s var(--ease);
}
.project::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(79,70,229,0.10), transparent);
  opacity: 0; transition: opacity 0.5s var(--ease);
}
.project:hover { padding-inline: var(--space-md); }
.project:hover::before { opacity: 1; }
.project > * { position: relative; z-index: 1; }

.project__index { font-size: 1rem; font-weight: 700; color: var(--muted); }
.project__title { font-size: clamp(1.6rem, 4vw, 3rem); margin-bottom: 0.5rem; transition: color 0.4s var(--ease); }
.project:hover .project__title { color: var(--accent); }
.project__desc { color: var(--muted); max-width: 60ch; margin-bottom: var(--space-sm); }
.project__arrow { font-size: 2rem; color: var(--text); transition: transform 0.4s var(--ease), color 0.4s var(--ease); }
.project:hover .project__arrow { transform: translate(6px, -6px); color: var(--accent); }

/* ----------------------------------------------------------
   13. RESEARCH & CERTIFICATIONS
---------------------------------------------------------- */
.research__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-md); margin-bottom: var(--space-xl); }
.paper {
  padding: var(--space-md); border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); position: relative; overflow: hidden;
  transition: transform 0.4s var(--ease), border-color 0.4s var(--ease);
}
.paper:hover { transform: translateY(-5px); border-color: var(--primary); }
.paper__num { font-size: 0.85rem; font-weight: 700; color: var(--accent); letter-spacing: 0.1em; }
.paper__title { font-size: clamp(1.2rem, 2.4vw, 1.7rem); font-weight: 700; line-height: 1.25; margin: 0.8rem 0 var(--space-md); }

.research__subhead { font-size: clamp(1.5rem, 3vw, 2.2rem); margin-bottom: var(--space-md); }
.certs { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-md); }
.cert {
  padding: var(--space-md); border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); transition: transform 0.4s var(--ease), border-color 0.4s var(--ease);
}
.cert:hover { transform: translateY(-4px); border-color: var(--accent); }
.cert__year { font-size: 0.8rem; font-weight: 600; color: var(--accent); letter-spacing: 0.1em; }
.cert__title { font-size: 1.3rem; font-weight: 700; margin: 0.5rem 0 0.3rem; }
.cert__org { font-size: 0.95rem; color: var(--muted); }

/* ----------------------------------------------------------
   14. CONTACT
---------------------------------------------------------- */
.contact__title { font-size: clamp(2rem, 6vw, 4.4rem); max-width: 16ch; margin-bottom: var(--space-lg); }
.contact__grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: var(--space-lg); align-items: start; }

.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-md); }
.field { margin-bottom: var(--space-md); position: relative; }
.field label { display: block; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted); margin-bottom: 0.6rem; }
.field input, .field textarea {
  width: 100%; padding: 0.9em 1em; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text); font-size: 1rem; transition: border-color 0.4s var(--ease), background 0.4s var(--ease);
  resize: vertical;
}
.field input::placeholder, .field textarea::placeholder { color: var(--muted); opacity: 0.6; }
.field input:focus, .field textarea:focus { outline: none; border-color: var(--primary); background: var(--surface-2); }
.field.has-error input, .field.has-error textarea { border-color: #ef4444; }
.field__error { display: block; font-size: 0.8rem; color: #f87171; margin-top: 0.5rem; min-height: 1em; }

.form__success { margin-top: var(--space-sm); color: var(--accent); font-weight: 600; }

.contact__lede { font-size: 1.15rem; color: var(--muted); margin-bottom: var(--space-md); max-width: 38ch; }
.contact__details { margin-bottom: var(--space-md); }
.contact__details li { display: flex; flex-direction: column; gap: 0.2rem; padding-block: 0.9rem; border-bottom: 1px solid var(--border); }
.contact__label { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--muted); }
.contact__details a { font-size: 1.05rem; font-weight: 500; transition: color 0.3s var(--ease); }
.contact__details a:hover { color: var(--accent); }

.socials { display: flex; flex-wrap: wrap; gap: var(--space-md); }
.socials a { color: var(--text); font-weight: 600; transition: color 0.3s var(--ease); }
.socials a:hover { color: var(--accent); }

/* ----------------------------------------------------------
   15. FOOTER
---------------------------------------------------------- */
.footer { padding-block: var(--space-lg); border-top: 1px solid var(--border); }
.footer__inner { display: grid; grid-template-columns: auto 1fr auto; gap: var(--space-md); align-items: center; }
.footer__logo { font-weight: 800; font-size: 1.4rem; }
.footer__note { color: var(--muted); text-align: center; font-size: 0.95rem; }
.footer__copy { color: var(--muted); font-size: 0.85rem; }
.footer__top { grid-column: 1 / -1; justify-self: end; color: var(--accent); font-size: 0.9rem; }

/* ----------------------------------------------------------
   16. REVEAL / ANIMATION STATES
---------------------------------------------------------- */
.reveal { opacity: 0; transform: translateY(40px); transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out); transition-delay: var(--reveal-delay, 0s); }
.reveal.is-visible { opacity: 1; transform: none; }

.line__inner { transition: transform 1s var(--ease-out); transition-delay: var(--stagger-delay, 0s); }
.hero.is-visible .line__inner { transform: translateY(0); }

.reveal-words .word { display: inline-block; overflow: hidden; vertical-align: top; }
.reveal-words .word span { display: inline-block; transform: translateY(110%); transition: transform 0.8s var(--ease-out); transition-delay: var(--word-delay, 0s); }
.reveal-words.is-visible .word span { transform: translateY(0); }

/* ----------------------------------------------------------
   17. RESPONSIVE BREAKPOINTS
---------------------------------------------------------- */

/* Ultrawide 1600px+ */
@media (min-width: 1600px) { :root { --container: 1440px; } }

/* < 1200px */
@media (max-width: 1200px) {
  .skills__grid { grid-template-columns: repeat(2, 1fr); }
  .skill-cat--wide { grid-column: 1 / -1; }
}

/* Tablet < 992px */
@media (max-width: 992px) {
  .about__grid { grid-template-columns: 1fr; }
  .research__grid { grid-template-columns: 1fr; }
  .contact__grid { grid-template-columns: 1fr; }
}

/* Mobile < 768px */
@media (max-width: 768px) {
  .cursor, .cursor--dot, .mouse-glow { display: none !important; }

  /* Mobile nav drawer */
  .nav {
    position: fixed; inset: 0; height: 100vh; height: 100dvh;
    background: rgba(11,15,20,0.97);
    -webkit-backdrop-filter: blur(20px); backdrop-filter: blur(20px);
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    padding: 5.5rem 1.5rem 3rem; overflow-y: auto;
    transform: translateY(-100%); transition: transform 0.6s var(--ease); z-index: 105;
  }
  .nav.is-open { transform: translateY(0); }
  .nav__list { flex-direction: column; align-items: center; gap: var(--space-md); margin: auto; }
  .nav__link { font-size: 1.5rem; }
  .nav-toggle { display: block; }

  .skills__grid { grid-template-columns: 1fr; }
  .timeline__projects { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
  .certs { grid-template-columns: 1fr; }
  .form__row { grid-template-columns: 1fr; gap: 0; }

  .project { grid-template-columns: auto 1fr; }
  .project__arrow { display: none; }

  .scroll-indicator { display: none; }

  .footer__inner { grid-template-columns: 1fr; text-align: center; justify-items: center; }
  .footer__top { justify-self: center; }

  .hero { padding-block: 7rem 5rem; }
}

/* Small mobile 320px+ */
@media (max-width: 400px) {
  :root { --gutter: 1.1rem; }
  .hero__actions { flex-direction: column; align-items: stretch; }
  .btn { justify-content: center; }
  .stats { grid-template-columns: 1fr; }
}

/* ----------------------------------------------------------
   18. REDUCED MOTION
---------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal, .line__inner, .reveal-words .word span { opacity: 1 !important; transform: none !important; }
  .marquee__track { animation: none; }
}