/* =========================================================================
   Hussain Ali — Portfolio Stylesheet
   Design system: dark, ink-and-circuit-trace theme with a single teal accent.
   Fonts: Source Serif 4 (display), Inter (body), JetBrains Mono (labels/data)
   ========================================================================= */

/* ---------- Design tokens ---------- */
:root{
  --bg: #0E1116;
  --bg-alt: #151920;
  --bg-raised: #1B2028;
  --text: #E8EAED;
  --text-dim: #9BA3AF;
  --text-faint: #6B7280;
  --accent: #3FAE96;
  --accent-strong: #57C9AF;
  --accent-soft: rgba(63, 174, 150, 0.13);
  --border: rgba(232, 234, 237, 0.10);
  --border-strong: rgba(232, 234, 237, 0.18);
  --shadow: 0 12px 32px rgba(0,0,0,0.35);

  --font-display: 'Source Serif 4', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;

  --max-width: 1120px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

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

[data-theme="light"]{
  --bg: #FAFAF8;
  --bg-alt: #F1F1EC;
  --bg-raised: #FFFFFF;
  --text: #14181F;
  --text-dim: #565F6D;
  --text-faint: #838C99;
  --accent: #1E7C69;
  --accent-strong: #166154;
  --accent-soft: rgba(30, 124, 105, 0.10);
  --border: rgba(20, 24, 31, 0.10);
  --border-strong: rgba(20, 24, 31, 0.18);
  --shadow: 0 12px 28px rgba(20,24,31,0.10);
}

/* ---------- Reset ---------- */
*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *, *::before, *::after{
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body{
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s var(--ease), color 0.3s var(--ease);
  overflow-x: hidden;
}

h1, h2, h3, h4{
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  margin: 0;
  color: var(--text);
}

p{ margin: 0 0 1em; color: var(--text-dim); }
p:last-child{ margin-bottom: 0; }
a{ color: inherit; text-decoration: none; }
ul{ list-style: none; margin: 0; padding: 0; }
button{ font-family: inherit; cursor: pointer; }
input, textarea{ font-family: inherit; font-size: 1rem; }
svg{ display: block; }
img{ max-width: 100%; display: block; }

.sr-only{
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.skip-link{
  position: absolute;
  top: -60px; left: 12px;
  background: var(--accent);
  color: #06110E;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  z-index: 1000;
  transition: top 0.2s var(--ease);
}
.skip-link:focus{ top: 12px; }

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

.icon{ width: 20px; height: 20px; }

/* ---------- Layout helpers ---------- */
.section{ padding: 112px 24px; }
.section--alt{ background: var(--bg-alt); }
.section__inner{ max-width: var(--max-width); margin: 0 auto; }

.section__eyebrow{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 14px;
}

.section__title{
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  max-width: 640px;
  margin-bottom: 20px;
}

.section__lede{
  max-width: 620px;
  font-size: 1.02rem;
  margin-bottom: 40px;
}
.section__lede code{
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--accent-soft);
  color: var(--accent-strong);
  padding: 0.1em 0.4em;
  border-radius: 4px;
}

/* Reveal-on-scroll targets */
.reveal{
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.is-visible{ opacity: 1; transform: translateY(0); }

/* ---------- Buttons ---------- */
.btn{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.2s var(--ease), background-color 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
  white-space: nowrap;
}
.btn:hover{ transform: translateY(-2px); }
.btn--primary{ background: var(--accent); color: #071613; }
.btn--primary:hover{ background: var(--accent-strong); }
.btn--outline{ border-color: var(--border-strong); color: var(--text); }
.btn--outline:hover{ border-color: var(--accent); color: var(--accent); }
.btn--ghost{ color: var(--text-dim); }
.btn--ghost:hover{ color: var(--accent); }
.btn--block{ width: 100%; justify-content: center; }

/* ---------- Navbar ---------- */
.navbar{
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 500;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.3s var(--ease), border-color 0.3s var(--ease), backdrop-filter 0.3s var(--ease);
}
.navbar.is-scrolled{
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom-color: var(--border);
}
.navbar__inner{
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.navbar__brand{
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-weight: 600;
}
.brand-mark{
  width: 34px; height: 34px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  display: grid;
  place-items: center;
  font-size: 0.8rem;
  border: 1px solid var(--border-strong);
}
.brand-name{ color: var(--text); font-size: 0.95rem; }

.navbar__links{
  display: flex;
  gap: 34px;
}
.nav-link{
  position: relative;
  font-size: 0.92rem;
  color: var(--text-dim);
  padding: 6px 0;
  transition: color 0.2s var(--ease);
}
.nav-link::after{
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 1.5px;
  background: var(--accent);
  transition: width 0.25s var(--ease);
}
.nav-link:hover{ color: var(--text); }
.nav-link.is-active{ color: var(--accent); }
.nav-link.is-active::after{ width: 100%; }

.navbar__actions{ display: flex; align-items: center; gap: 10px; }

.theme-toggle{
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text-dim);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.theme-toggle:hover{ color: var(--accent); border-color: var(--accent); }
.icon-sun{ display: none; }
[data-theme="light"] .icon-moon{ display: none; }
[data-theme="light"] .icon-sun{ display: block; }

.hamburger{
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 38px; height: 38px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: transparent;
}
.hamburger span{
  width: 16px; height: 1.5px;
  margin: 0 auto;
  background: var(--text);
  transition: transform 0.25s var(--ease), opacity 0.25s var(--ease);
}
.hamburger.is-open span:nth-child(1){ transform: translateY(6.5px) rotate(45deg); }
.hamburger.is-open span:nth-child(2){ opacity: 0; }
.hamburger.is-open span:nth-child(3){ transform: translateY(-6.5px) rotate(-45deg); }

.mobile-nav{
  position: fixed;
  top: var(--nav-height); left: 0; right: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  z-index: 499;
  padding: 8px 24px 20px;
}
.mobile-nav ul{ display: flex; flex-direction: column; }
.mobile-nav .nav-link{
  display: block;
  padding: 13px 4px;
  font-size: 1rem;
  border-bottom: 1px solid var(--border);
}

/* ---------- Hero ---------- */
.hero{
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-height) + 32px) 24px 60px;
}
.hero__inner{
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}

.hero__avatar{
  position: relative;
  width: 84px; height: 84px;
  border-radius: 50%;
  margin-bottom: 22px;
  overflow: hidden;
  border: 1px solid var(--border-strong);
  background: var(--accent-soft);
}
.hero__avatar-fallback{
  position: absolute; inset: 0;
  display: grid; place-items: center;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
}
.hero__avatar img{
  position: relative;
  width: 100%; height: 100%;
  object-fit: cover;
}
.hero__avatar img.is-broken{ display: none; }

.eyebrow{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  border: 1px solid var(--border-strong);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 26px;
}
.eyebrow__dot{
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.hero__name{
  font-size: clamp(2.6rem, 6vw, 4.2rem);
  letter-spacing: -0.01em;
}
.hero__role{
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--accent);
  margin: 14px 0 22px;
}
.hero__summary{
  max-width: 540px;
  font-size: 1.06rem;
  color: var(--text-dim);
}
.hero__summary strong{ color: var(--text); }

.hero__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 32px 0 30px;
}

.hero__social{ display: flex; gap: 14px; }
.social-icon{
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  color: var(--text-dim);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.social-icon svg{ width: 17px; height: 17px; }
.social-icon:hover{ color: var(--accent); border-color: var(--accent); transform: translateY(-2px); }

.hero__diagram{ display: flex; justify-content: center; }
.trace-map{ width: 100%; max-width: 400px; height: auto; }
.trace-lines path{
  stroke: var(--border-strong);
}
.trace-nodes circle{
  fill: var(--bg);
  stroke: var(--accent);
  stroke-width: 1.6;
}
.trace-node--core{
  fill: var(--accent);
  stroke: var(--accent);
}
.trace-labels text{
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.04em;
  fill: var(--text-faint);
}
.trace-label--core{
  fill: var(--text);
  font-weight: 600;
  font-size: 12px;
}

.scroll-cue{
  position: absolute;
  bottom: 34px; left: 50%;
  transform: translateX(-50%);
  width: 22px; height: 34px;
  border: 1.5px solid var(--border-strong);
  border-radius: 12px;
  display: flex; justify-content: center; padding-top: 6px;
}
.scroll-cue span{
  width: 3px; height: 7px;
  border-radius: 2px;
  background: var(--accent);
  animation: scrollcue 1.8s var(--ease) infinite;
}
@keyframes scrollcue{
  0%{ transform: translateY(0); opacity: 1; }
  70%{ transform: translateY(9px); opacity: 0; }
  100%{ transform: translateY(0); opacity: 0; }
}

/* ---------- About ---------- */
.about__grid{
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 56px;
  margin-top: 8px;
}
.about__lead p{ font-size: 1.02rem; }

.about__facts{
  border-left: 1px solid var(--border-strong);
  padding-left: 28px;
  display: flex;
  flex-direction: column;
  gap: 22px;
  height: fit-content;
}
.about__fact-label{
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 4px;
}
.about__fact-value{ display: block; color: var(--text); font-size: 0.98rem; }

/* ---------- Timeline (Education) ---------- */
.timeline{
  position: relative;
  padding-left: 32px;
}
.timeline::before{
  content: "";
  position: absolute;
  left: 5px; top: 6px; bottom: 6px;
  width: 1px;
  background: var(--border-strong);
}
.timeline__item{ position: relative; margin-bottom: 28px; }
.timeline__item:last-child{ margin-bottom: 0; }
.timeline__marker{
  position: absolute;
  left: -32px; top: 22px;
  width: 11px; height: 11px;
  border-radius: 50%;
  background: var(--bg-alt);
  border: 2px solid var(--accent);
}
.timeline__card{
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 26px 28px;
}
.timeline__card-head{
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 6px;
}
.timeline__card-head h3{ font-size: 1.15rem; }
.timeline__date{
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-faint);
}
.timeline__org{ color: var(--text-dim); margin-bottom: 6px; }
.timeline__meta{ font-size: 0.92rem; color: var(--text-dim); margin: 0; }
.timeline__meta strong{ color: var(--accent); }

.timeline__card--placeholder{
  border-style: dashed;
  color: var(--text-faint);
  background: transparent;
  font-size: 0.9rem;
}
.timeline__card--placeholder p{ color: var(--text-faint); margin: 0; }

/* ---------- Experience ---------- */
.experience-card{
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
}
.experience-card__head{
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 26px;
  margin-bottom: 26px;
}
.experience-card__head h3{ font-size: 1.3rem; margin-bottom: 6px; }
.experience-card__org{ color: var(--text-dim); margin: 0; }
.experience-card__duration{
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  border: 1px solid var(--border-strong);
  padding: 6px 12px;
  border-radius: 999px;
  white-space: nowrap;
}

.experience-card__stat{
  display: flex;
  align-items: baseline;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}
.experience-card__stat-number{
  font-family: var(--font-display);
  font-size: 3.4rem;
  font-weight: 600;
  color: var(--accent);
  line-height: 1;
}
.experience-card__stat-plus{
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--accent);
}
.experience-card__stat-label{
  color: var(--text-dim);
  font-size: 0.98rem;
  margin-left: 6px;
}

.experience-card__list{
  display: grid;
  gap: 14px;
}
.experience-card__list li{
  position: relative;
  padding-left: 24px;
  color: var(--text-dim);
  font-size: 0.98rem;
}
.experience-card__list li::before{
  content: "";
  position: absolute;
  left: 0; top: 9px;
  width: 7px; height: 7px;
  background: var(--accent);
  border-radius: 1px;
  transform: rotate(45deg);
}

/* ---------- Skills ---------- */
.skills__controls{
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 34px;
}
.skills__filters{ display: flex; flex-wrap: wrap; gap: 10px; }
.chip{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text-dim);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.chip:hover{ color: var(--text); }
.chip.is-active{
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}

.skills__search{
  position: relative;
  display: flex;
  align-items: center;
  min-width: 220px;
}
.skills__search .icon{
  position: absolute; left: 12px;
  width: 16px; height: 16px;
  color: var(--text-faint);
}
.skills__search input{
  width: 100%;
  background: var(--bg-raised);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 10px 12px 10px 36px;
  color: var(--text);
}
.skills__search input::placeholder{ color: var(--text-faint); }

.skills__grid{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.skill-card{
  font-size: 0.92rem;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-raised);
  color: var(--text);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease), opacity 0.2s var(--ease);
}
.skill-card:hover{ border-color: var(--accent); transform: translateY(-2px); }
.skill-card.is-hidden{ display: none; }

.skills__empty{ margin-top: 20px; color: var(--text-faint); font-family: var(--font-mono); font-size: 0.9rem; }

/* ---------- Projects ---------- */
.projects__filters{
  display: flex; flex-wrap: wrap; gap: 10px;
  margin-bottom: 34px;
}
.projects__grid{
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 22px;
}
.project-card{
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.project-card:hover{ border-color: var(--border-strong); transform: translateY(-3px); }
.project-card.is-hidden{ display: none; }

.project-card__tag{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.project-card h3{ font-size: 1.15rem; margin-bottom: 10px; }
.project-card p{ font-size: 0.94rem; flex-grow: 1; }
.project-card__tech{
  display: flex; flex-wrap: wrap; gap: 8px;
  margin: 16px 0 20px;
}
.project-card__tech span{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 4px 9px;
  border-radius: 999px;
}
.project-card__link{
  align-self: flex-start;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: none;
  background: none;
  padding: 0;
}
.project-card__link svg{ width: 14px; height: 14px; transition: transform 0.2s var(--ease); }
.project-card__link:hover svg{ transform: translateX(3px); }

/* Modal */
.modal{ position: fixed; inset: 0; z-index: 900; display: flex; align-items: center; justify-content: center; padding: 24px; }
.modal[hidden]{ display: none; }
.modal__backdrop{
  position: absolute; inset: 0;
  background: rgba(6, 9, 13, 0.7);
  backdrop-filter: blur(3px);
}
[data-theme="light"] .modal__backdrop{ background: rgba(20,24,31,0.35); }
.modal__dialog{
  position: relative;
  background: var(--bg-raised);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  max-width: 560px;
  width: 100%;
  max-height: 84vh;
  overflow-y: auto;
  padding: 40px;
  box-shadow: var(--shadow);
  animation: modalIn 0.25s var(--ease);
}
@keyframes modalIn{
  from{ opacity: 0; transform: translateY(12px) scale(0.98); }
  to{ opacity: 1; transform: translateY(0) scale(1); }
}
.modal__close{
  position: absolute; top: 20px; right: 20px;
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text-dim);
}
.modal__close:hover{ color: var(--accent); border-color: var(--accent); }
.modal__body h3{ font-size: 1.3rem; margin-bottom: 6px; padding-right: 30px; }
.modal__body .project-card__tag{ margin-bottom: 14px; }
.modal__body h4{
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin: 22px 0 10px;
}
.modal__body ul{ display: grid; gap: 8px; }
.modal__body ul li{
  position: relative;
  padding-left: 18px;
  color: var(--text-dim);
  font-size: 0.94rem;
}
.modal__body ul li::before{
  content: "";
  position: absolute; left: 0; top: 8px;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent);
}
.modal__body .project-card__tech{ margin-top: 6px; }

/* ---------- Certifications ---------- */
.award-card{
  display: flex;
  gap: 20px;
  align-items: flex-start;
  background: var(--bg-raised);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin-bottom: 36px;
}
.award-card__icon{
  width: 30px; height: 30px;
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 2px;
}
.award-card__date{
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}
.award-card h3{ font-size: 1.05rem; margin-bottom: 8px; }
.award-card__org{ font-size: 0.92rem; margin: 0; }

.cert-grid{
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.cert-card{
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px 26px;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.cert-card:hover{ border-color: var(--accent); transform: translateY(-2px); }
.cert-card h3{ font-size: 0.98rem; margin-bottom: 8px; line-height: 1.35; }
.cert-card__org{ font-size: 0.86rem; margin: 0 0 4px; color: var(--text-dim); }
.cert-card__date{
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-faint);
  margin: 0;
}

/* ---------- Interests ---------- */
.interest-grid{
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 18px;
}
.interest-card{
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.interest-card:hover{ border-color: var(--accent); transform: translateY(-2px); }
.interest-card__index{
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  margin-bottom: 14px;
}
.interest-card h3{ font-size: 1rem; font-family: var(--font-body); font-weight: 600; }

/* ---------- Contact ---------- */
.contact__grid{
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 50px;
}
.contact__list{ display: flex; flex-direction: column; gap: 4px; }
.contact__row{
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 4px;
  border-bottom: 1px solid var(--border);
  transition: transform 0.2s var(--ease);
}
.contact__row:hover{ transform: translateX(4px); }
.contact__icon{
  width: 42px; height: 42px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  flex-shrink: 0;
}
.contact__icon svg{ width: 18px; height: 18px; }
.contact__label{
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-faint);
  margin-bottom: 3px;
}
.contact__value{ display: block; color: var(--text); font-weight: 500; }

.contact-form{
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.field{ display: flex; flex-direction: column; gap: 8px; }
.field label{
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
}
.field input, .field textarea{
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  color: var(--text);
  resize: vertical;
  transition: border-color 0.2s var(--ease);
}
.field input:focus, .field textarea:focus{ border-color: var(--accent); }
.contact-form__note{
  font-size: 0.85rem;
  color: var(--accent);
  min-height: 1.2em;
  margin: 0;
}

/* ---------- Footer ---------- */
.footer{ border-top: 1px solid var(--border); padding: 32px 24px; }
.footer__inner{
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.footer__inner p{ font-size: 0.88rem; color: var(--text-faint); margin: 0; }
.footer__social{ display: flex; gap: 12px; }

/* ---------- Back to top ---------- */
.back-to-top{
  position: fixed;
  right: 24px; bottom: 24px;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--accent);
  color: #06110E;
  border: none;
  display: grid; place-items: center;
  box-shadow: var(--shadow);
  z-index: 400;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
}
.back-to-top.is-visible{ opacity: 1; transform: translateY(0); }
.back-to-top svg{ width: 20px; height: 20px; }

/* =========================================================================
   Responsive
   ========================================================================= */
@media (max-width: 900px){
  .hero__inner{ grid-template-columns: 1fr; }
  .hero__diagram{ order: -1; max-width: 280px; margin: 0 auto; }
  .about__grid{ grid-template-columns: 1fr; }
  .about__facts{ border-left: none; border-top: 1px solid var(--border-strong); padding-left: 0; padding-top: 24px; }
  .contact__grid{ grid-template-columns: 1fr; }
}

@media (max-width: 760px){
  .navbar__links{ display: none; }
  .hamburger{ display: flex; }
  .section{ padding: 80px 20px; }
  .experience-card{ padding: 28px; }
  .experience-card__stat-number{ font-size: 2.6rem; }
  .award-card{ flex-direction: column; padding: 24px; }
}

@media (max-width: 480px){
  .hero__actions{ flex-direction: column; align-items: stretch; }
  .btn{ justify-content: center; }
  .modal__dialog{ padding: 28px; }
}