/* =========================================================
   Sultan Al Farhan — Portfolio
   Design system: shared tokens + light/dark theme values
   ========================================================= */

:root {
  /* Type */
  --font-heading: "Iowan Old Style", "Palatino Linotype", "URW Palladio", Georgia, "Times New Roman", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  /* Spacing scale */
  --space-xs: .5rem;
  --space-sm: 1rem;
  --space-md: 1.75rem;
  --space-lg: 3rem;
  --space-xl: 5rem;

  /* Shape */
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 26px;

  /* Motion */
  --ease: cubic-bezier(.22,.8,.32,1);
  --duration: 220ms;

  /* Light theme (default) */
  --bg: #ffffff;
  --bg-soft: #f2f5f9;
  --surface: #ffffff;
  --surface-alt: #f6f8fb;
  --text: #101c30;
  --text-secondary: #526074;
  --border: #dfe4ec;
  --accent: #2452eb;
  --accent-strong: #17399e;
  --accent-soft: #e8edfd;
  --shadow-sm: 0 1px 2px rgba(16, 28, 48, .06), 0 1px 1px rgba(16, 28, 48, .04);
  --shadow-md: 0 12px 30px -12px rgba(16, 28, 48, .18);
  --shadow-lg: 0 30px 60px -20px rgba(16, 28, 48, .22);
  --overlay: rgba(16, 20, 30, .55);
  --header-bg: rgba(255, 255, 255, .78);
  color-scheme: light;
}

html[data-theme="dark"] {
  --bg: #0a0e1a;
  --bg-soft: #0d1220;
  --surface: #131a2c;
  --surface-alt: #182036;
  --text: #eef1f7;
  --text-secondary: #a3aec4;
  --border: #232d45;
  --accent: #5b93ff;
  --accent-strong: #8fd4ff;
  --accent-soft: #182644;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);
  --shadow-md: 0 18px 40px -16px rgba(0, 0, 0, .55);
  --shadow-lg: 0 34px 70px -20px rgba(0, 0, 0, .6);
  --overlay: rgba(3, 5, 12, .7);
  --header-bg: rgba(10, 14, 26, .72);
  color-scheme: dark;
}

/* =========================================================
   Reset & base
   ========================================================= */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  transition: background-color var(--duration) var(--ease), color var(--duration) var(--ease);
}
body.modal-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; background: none; border: 0; }
button, a { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, summary:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
  border-radius: 4px;
}
p { margin: 0 0 1.2rem; color: var(--text-secondary); }
h1, h2, h3 { margin: 0; font-family: var(--font-heading); font-weight: 500; line-height: 1.08; letter-spacing: -.01em; color: var(--text); }
h2 { font-size: clamp(2.1rem, 1.5rem + 2.6vw, 3.4rem); }
h3 { font-size: clamp(1.2rem, 1.05rem + .5vw, 1.5rem); line-height: 1.28; }
table { color: var(--text); }
.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; left: -999px; top: 0; background: var(--accent); color: #fff;
  padding: 12px 18px; z-index: 100; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }
.icon-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.wrap { width: min(1280px, calc(100% - 96px)); margin-inline: auto; }
.eyebrow {
  font-family: var(--font-body); font-size: .78rem; font-weight: 700; letter-spacing: .14em;
  text-transform: uppercase; color: var(--accent); margin: 0 0 20px; display: flex; align-items: center; gap: 8px;
}
.line { width: 22px; height: 2px; background: var(--accent); display: inline-block; }
.accent-dot { color: var(--accent); }
.small-label { display: inline-block; margin-top: 10px; font-size: .8rem; font-weight: 700; color: var(--accent); letter-spacing: .03em; }
.org { color: var(--accent); font-weight: 600; font-size: .92rem; margin-bottom: 6px; }

/* Buttons & text links */
.button {
  display: inline-flex; align-items: center; gap: 12px; padding: 15px 26px; border-radius: 100px;
  font-size: .95rem; font-weight: 600; transition: transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease), background-color var(--duration) var(--ease), color var(--duration) var(--ease);
}
.button.primary { background: var(--accent); color: #fff; box-shadow: var(--shadow-md); }
.button.primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.button.ghost { border: 1.5px solid var(--border); color: var(--text); }
.button.ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.text-link {
  display: inline-flex; align-items: center; gap: 8px; font-weight: 600; font-size: .95rem;
  color: var(--text); border-bottom: 1.5px solid var(--border); padding-bottom: 3px;
  transition: color var(--duration) var(--ease), border-color var(--duration) var(--ease), gap var(--duration) var(--ease);
}
.text-link:hover { color: var(--accent); border-color: var(--accent); gap: 11px; }

/* =========================================================
   Reveal-on-scroll (only activates once JS marks <html> ready)
   ========================================================= */
@media (prefers-reduced-motion: no-preference) {
  html.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
  html.js .reveal.in-view { opacity: 1; transform: none; }
}

/* =========================================================
   Header
   ========================================================= */
.header {
  position: sticky; top: 0; z-index: 30;
  background: var(--header-bg);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  transition: background-color var(--duration) var(--ease), border-color var(--duration) var(--ease);
}
@supports not (backdrop-filter: blur(1px)) { .header { background: var(--surface); } }
.header-inner { height: 88px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: baseline; gap: 14px; white-space: nowrap; }
.brand-mark { font-family: var(--font-heading); font-size: 1.6rem; font-weight: 600; letter-spacing: -.02em; }
.brand-caption { font-size: .68rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--text-secondary); }
#navigation { display: flex; align-items: center; gap: 26px; font-size: .92rem; font-weight: 500; }
#navigation a { padding: 6px 0; color: var(--text-secondary); position: relative; transition: color var(--duration) var(--ease); }
#navigation a:hover, #navigation a.active { color: var(--text); }
#navigation a.active::after { content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px; background: var(--accent); border-radius: 2px; }
.nav-contact { display: inline-flex; align-items: center; gap: 6px; color: var(--text) !important; border-bottom: 1.5px solid var(--border); padding-bottom: 6px !important; }
.nav-contact:hover { border-color: var(--accent); }
.header-actions { display: flex; align-items: center; gap: 8px; }
.theme-toggle, .menu-toggle {
  display: flex; align-items: center; justify-content: center; width: 42px; height: 42px;
  border-radius: 50%; border: 1px solid var(--border); color: var(--text);
  transition: border-color var(--duration) var(--ease), background-color var(--duration) var(--ease);
}
.theme-toggle:hover, .menu-toggle:hover { border-color: var(--accent); }
.theme-toggle .icon-moon { display: none; }
html[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: block; }
.menu-toggle { display: none; }
.menu-toggle .icon-close { display: none; }
.menu-toggle[aria-expanded="true"] .icon-menu { display: none; }
.menu-toggle[aria-expanded="true"] .icon-close { display: block; }

/* =========================================================
   Hero
   ========================================================= */
.hero { display: grid; grid-template-columns: 1.15fr 1fr; gap: 70px; align-items: center; padding-block: 76px 68px; }
.hero h1 { font-size: clamp(3.4rem, 2rem + 7vw, 6.4rem); margin: 6px 0 26px; }
.hero-intro { font-size: clamp(1.15rem, 1rem + .6vw, 1.5rem); color: var(--text); font-family: var(--font-heading); margin-bottom: 18px; }
.hero-intro em { color: var(--accent); font-style: normal; }
.hero-description { max-width: 460px; }
.actions { display: flex; flex-wrap: wrap; gap: 16px; margin: 30px 0 40px; }
.hero-foot { display: flex; gap: 26px; font-size: .74rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--text-secondary); }

.portrait { display: flex; flex-direction: column; gap: 18px; justify-self: end; width: 100%; max-width: 420px; }
.portrait-frame {
  position: relative; border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--border);
  box-shadow: var(--shadow-lg); aspect-ratio: 4 / 5.4; background: var(--surface-alt);
}
.portrait-frame img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 15%; }
.portrait-grid {
  position: absolute; inset: 14px; border: 1px solid rgba(255,255,255,.35); border-radius: calc(var(--radius-lg) - 12px);
  pointer-events: none; z-index: 2;
  background-image:
    linear-gradient(rgba(255,255,255,.18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.18) 1px, transparent 1px);
  background-size: 33.33% 33.33%;
  mix-blend-mode: overlay;
}
.portrait-tag {
  position: absolute; left: 18px; bottom: 18px; z-index: 3; display: flex; gap: 8px; align-items: center;
  background: rgba(10,14,26,.55); color: #fff; padding: 8px 14px; border-radius: 100px;
  font-size: .68rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
  -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
}
.portrait-tag span:first-child { color: var(--accent-strong); }
.portrait-caption { text-align: center; font-size: .95rem; color: var(--text-secondary); }
.portrait-caption strong { color: var(--text); font-weight: 600; }

.discipline-bar { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--bg-soft); transition: background-color var(--duration) var(--ease), border-color var(--duration) var(--ease); }
.discipline-bar .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px 26px; padding: 22px 0; }
.discipline-bar span { font-size: .78rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--text-secondary); }

/* =========================================================
   Sections (generic)
   ========================================================= */
.section { padding-block: var(--space-xl); }
.section-heading { display: flex; justify-content: space-between; align-items: flex-end; gap: 40px; margin-bottom: var(--space-lg); }
.section-heading > p { max-width: 320px; text-align: right; }

/* About */
.about { grid-template-columns: .8fr 1.2fr; display: grid; gap: 70px; }
.large-copy { font-size: clamp(1.15rem, 1rem + .5vw, 1.35rem); color: var(--text); font-family: var(--font-heading); }
.skills { list-style: none; display: flex; flex-wrap: wrap; gap: 10px; padding: 0; margin: 8px 0 28px; }
.skills li {
  font-size: .85rem; font-weight: 600; padding: 9px 16px; border-radius: 100px;
  background: var(--surface-alt); border: 1px solid var(--border); color: var(--text);
}

/* =========================================================
   Projects
   ========================================================= */
.project-grid { display: grid; grid-template-columns: 1.3fr 1fr; grid-auto-rows: min-content; gap: 28px; margin-bottom: var(--space-lg); }
.project-card {
  position: relative; display: flex; flex-direction: column; border-radius: var(--radius-md); overflow: hidden;
  border: 1px solid var(--border); background: var(--surface);
  box-shadow: var(--shadow-sm);
  transition: transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease), border-color var(--duration) var(--ease);
}
.project-card:hover, .project-card:focus-within { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: var(--accent); }
.project-card.featured { grid-row: span 2; }
.project-image { position: relative; display: block; width: 100%; aspect-ratio: 4 / 3; overflow: hidden; background: var(--surface-alt); }
.project-card.featured .project-image { aspect-ratio: 16 / 12; }
.project-image img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s var(--ease); }
.project-card:hover .project-image img, .project-card:focus-within .project-image img { transform: scale(1.06); }
.project-category {
  position: absolute; top: 16px; left: 16px; z-index: 2; background: rgba(10,14,26,.6); color: #fff;
  font-size: .66rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; padding: 7px 12px;
  border-radius: 100px; -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
}
.project-number { position: absolute; bottom: 14px; right: 16px; z-index: 2; color: #fff; font-family: var(--font-heading); font-size: 1.4rem; opacity: .85; }
.project-body { padding: 26px 28px 28px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.project-body h3 { font-size: clamp(1.3rem, 1.1rem + .6vw, 1.7rem); }
.project-card.featured .project-body h3 { font-size: clamp(1.6rem, 1.2rem + 1.2vw, 2.2rem); }
.project-body p { margin: 0; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 2px 0 6px; }
.tag-row span {
  font-size: .74rem; font-weight: 600; padding: 6px 12px; border-radius: 100px;
  background: var(--surface-alt); border: 1px solid var(--border); color: var(--text-secondary);
}
.project-explore { margin-top: auto; align-self: flex-start; }

.internship {
  display: grid; grid-template-columns: 200px 1fr; gap: 40px; align-items: start; padding: 34px 0 0;
  border-top: 1px solid var(--border);
}
.internship .eyebrow { margin: 6px 0 0; }
.internship h3 { margin-bottom: 12px; }
.internship p { margin: 0; }

/* =========================================================
   Research
   ========================================================= */
.research-list { display: flex; flex-direction: column; gap: 24px; margin-bottom: var(--space-lg); }
.research-feature {
  display: grid; grid-template-columns: 130px 1fr; gap: 40px; align-items: start;
  padding: 46px; border-radius: var(--radius-lg); background: var(--surface-alt); border: 1px solid var(--border);
}
.research-index { font-family: var(--font-heading); font-size: 2.6rem; color: var(--accent); line-height: 1; }
.research-index span { display: block; font-size: 1rem; color: var(--text-secondary); margin-top: 8px; }
.research-feature h3 { margin: 4px 0 16px; font-size: clamp(1.4rem, 1.1rem + 1vw, 1.9rem); }
.program-heading { margin-bottom: var(--space-md); }
.program-heading h3 { margin-top: 8px; }
.program-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px 34px; }
.program-grid article { padding-top: 22px; border-top: 1px solid var(--border); }
.program-grid h3 { margin: 8px 0 10px; }
.program-grid p { margin: 0; }

/* =========================================================
   Education
   ========================================================= */
.education-section { background: var(--bg-soft); transition: background-color var(--duration) var(--ease); }
.education-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: start; }
.subject-list { list-style: none; display: flex; flex-wrap: wrap; gap: 10px; padding: 0; margin: 20px 0 0; }
.subject-list li { font-size: .85rem; font-weight: 600; padding: 9px 16px; border-radius: 100px; background: var(--surface); border: 1px solid var(--border); }
.grade-panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 32px; box-shadow: var(--shadow-sm); }
.grade-panel h3 { margin-bottom: 18px; }
.grade-panel table { width: 100%; border-collapse: collapse; font-size: .95rem; }
.grade-panel th, .grade-panel td { text-align: left; padding: 12px 10px; border-bottom: 1px solid var(--border); }
.grade-panel th { font-size: .74rem; letter-spacing: .08em; text-transform: uppercase; color: var(--text-secondary); font-weight: 700; }
.grade-panel td:last-child, .grade-panel th:last-child { text-align: right; font-weight: 600; }
.grade-panel tbody tr:last-child td { border-bottom: 0; }

/* =========================================================
   Achievements
   ========================================================= */
.achievement-highlights { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: var(--space-lg); }
.achievement-highlights article {
  padding: 30px 26px; border-radius: var(--radius-md); background: var(--surface); border: 1px solid var(--border);
  box-shadow: var(--shadow-sm); transition: transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}
.achievement-highlights article:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.highlight-number { display: block; font-family: var(--font-heading); font-size: 2.6rem; color: var(--accent); letter-spacing: -.02em; margin-bottom: 6px; }
.achievement-highlights h3 { font-size: 1.1rem; margin-bottom: 6px; }
.achievement-highlights p { margin: 0; font-size: .92rem; }
.distinctions { padding: 26px 30px; border-radius: var(--radius-md); background: var(--surface-alt); border: 1px solid var(--border); margin-bottom: var(--space-lg); }
.distinctions p:last-child { margin-bottom: 0; }
.distinctions strong { color: var(--text); }

.certificate-heading { display: flex; justify-content: space-between; align-items: flex-end; gap: 20px; margin-bottom: 24px; flex-wrap: wrap; }
.certificate-heading p { margin: 0; max-width: 320px; }
.certificate-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.cert-card {
  display: flex; flex-direction: column; text-align: left; border-radius: var(--radius-md); overflow: hidden;
  border: 1px solid var(--border); background: var(--surface);
  transition: transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease), border-color var(--duration) var(--ease);
}
.cert-card:hover, .cert-card:focus-visible { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--accent); }
.cert-image {
  position: relative; display: flex; align-items: center; justify-content: center; height: 180px;
  background: var(--surface-alt); padding: 10px;
}
.cert-image img { width: 100%; height: 100%; object-fit: contain; }
.cert-card strong { padding: 14px 16px 2px; font-size: .95rem; font-weight: 600; }
.cert-card span.cert-subtitle { padding: 0 16px 16px; font-size: .82rem; color: var(--text-secondary); }

/* =========================================================
   Leadership
   ========================================================= */
.leadership-section { padding-block: var(--space-xl); }
.leadership-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 60px; margin: var(--space-lg) 0; align-items: start; }
.timeline { position: relative; display: flex; flex-direction: column; gap: 34px; padding-left: 28px; border-left: 1.5px solid var(--border); }
.timeline article { position: relative; }
.timeline-dot { position: absolute; left: -33.5px; top: 6px; width: 9px; height: 9px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.timeline-date { display: block; font-size: .74rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--text-secondary); margin-bottom: 8px; }
.timeline h3 { margin-bottom: 6px; }
.timeline p:last-child { margin: 0; }

.community { border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--border); background: var(--surface); box-shadow: var(--shadow-sm); }
.community img { width: 100%; aspect-ratio: 9 / 7; object-fit: cover; }
.community-caption { padding: 24px 26px 28px; }
.community-caption h3 { margin-bottom: 8px; }
.community-caption p { margin: 0; }

.service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; margin-bottom: var(--space-lg); }
.service-grid article { padding: 24px 22px; border-radius: var(--radius-md); background: var(--surface-alt); border: 1px solid var(--border); }
.service-grid h3 { font-size: 1.05rem; margin-bottom: 8px; }
.service-grid p { margin: 0; font-size: .9rem; }

.life-gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.life-gallery button {
  position: relative; display: block; border-radius: var(--radius-md); overflow: hidden; aspect-ratio: 4 / 5;
  border: 1px solid var(--border);
}
.life-gallery img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s var(--ease); }
.life-gallery button:hover img, .life-gallery button:focus-visible img { transform: scale(1.06); }
.life-gallery span {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 16px 16px 14px; text-align: left;
  display: flex; align-items: center; gap: 8px; color: #fff; font-size: .82rem; font-weight: 600;
  background: linear-gradient(to top, rgba(6,9,18,.85), rgba(6,9,18,0));
}

/* =========================================================
   Contact
   ========================================================= */
.contact { padding-block: calc(var(--space-xl) + 1rem); }
.contact-main { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.contact-main h2 { font-size: clamp(2.2rem, 1.6rem + 3.4vw, 4rem); }
.contact-arrow {
  flex-shrink: 0; width: 82px; height: 82px; border-radius: 50%; border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center; color: var(--text);
  transition: background-color var(--duration) var(--ease), color var(--duration) var(--ease), transform var(--duration) var(--ease);
}
.contact-arrow:hover { background: var(--accent); color: #fff; transform: rotate(45deg); }
.contact-links { display: flex; flex-wrap: wrap; gap: 30px; margin-top: 44px; padding-top: 34px; border-top: 1px solid var(--border); font-size: 1.05rem; font-weight: 600; }
.contact-links a { display: inline-flex; align-items: center; gap: 8px; }
.contact-links a:hover { color: var(--accent); }

.footer {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; align-items: center;
  padding-block: 30px; border-top: 1px solid var(--border); font-size: .85rem; color: var(--text-secondary);
}
.footer a { display: inline-flex; align-items: center; gap: 6px; color: var(--text-secondary); }
.footer a:hover { color: var(--accent); }

/* =========================================================
   Dialog / viewer
   ========================================================= */
dialog#viewer {
  width: min(920px, calc(100% - 40px)); max-height: calc(100% - 60px); margin: auto; padding: 0;
  border: 1px solid var(--border); border-radius: var(--radius-lg); background: var(--surface); color: var(--text);
  box-shadow: var(--shadow-lg);
}
dialog#viewer::backdrop { background: var(--overlay); }
.dialog-header {
  position: sticky; top: 0; z-index: 2; display: flex; justify-content: space-between; align-items: center;
  gap: 20px; padding: 22px 26px; background: var(--surface); border-bottom: 1px solid var(--border);
}
.dialog-header h2 { font-size: 1.3rem; }
.close-dialog {
  flex-shrink: 0; width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
}
.close-dialog:hover { border-color: var(--accent); color: var(--accent); }
#viewer-content { padding: 26px; }
.detail-intro p:last-of-type { margin-bottom: 20px; }
.detail-facts { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 20px; }
.detail-facts span { font-size: .8rem; font-weight: 600; padding: 7px 13px; border-radius: 100px; background: var(--surface-alt); border: 1px solid var(--border); }
.detail-gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px; margin-top: 10px; }
.detail-gallery button { border-radius: var(--radius-sm); overflow: hidden; aspect-ratio: 4 / 3; border: 1px solid var(--border); }
.detail-gallery img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s var(--ease); }
.detail-gallery button:hover img { transform: scale(1.08); }
.detail-videos { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; margin-top: 16px; }
.detail-videos video { width: 100%; border-radius: var(--radius-sm); background: #000; }

.image-view { display: flex; flex-direction: column; gap: 16px; }
.image-view-stage { position: relative; display: flex; align-items: center; justify-content: center; background: var(--surface-alt); border-radius: var(--radius-md); overflow: hidden; min-height: 260px; }
.image-view-stage img { max-height: 62vh; width: auto; object-fit: contain; }
.image-nav {
  position: absolute; top: 50%; transform: translateY(-50%); width: 44px; height: 44px; border-radius: 50%;
  background: rgba(10,14,26,.55); color: #fff; display: flex; align-items: center; justify-content: center;
}
.image-nav:hover { background: var(--accent); }
.image-nav.prev { left: 14px; }
.image-nav.next { right: 14px; }
.image-view-meta { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.image-counter { font-size: .8rem; color: var(--text-secondary); font-weight: 600; }

.document-frame { width: 100%; height: 70vh; border: 1px solid var(--border); border-radius: var(--radius-sm); margin: 16px 0; }
.viewer-note { font-size: .85rem; }

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 1180px) {
  .wrap { width: calc(100% - 64px); }
  .header-inner { height: 78px; }
  #navigation { gap: 18px; font-size: .86rem; }
  .brand-caption { display: none; }
  .hero { gap: 40px; }
  .project-grid { grid-template-columns: 1fr; }
  .project-card.featured { grid-row: auto; }
  .certificate-grid { grid-template-columns: repeat(3, 1fr); }
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .program-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 76px; }
  .wrap { width: calc(100% - 40px); }
  .header-inner { height: 70px; }
  #navigation {
    position: fixed; inset: 70px 0 auto 0; display: none; flex-direction: column; align-items: stretch;
    gap: 0; padding: 10px 20px 20px; background: var(--surface); border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md); max-height: calc(100vh - 70px); overflow-y: auto;
  }
  #navigation.open { display: flex; }
  #navigation a { padding: 14px 4px; border-bottom: 1px solid var(--border); }
  #navigation a:last-child { border-bottom: 0; }
  .nav-contact { border-bottom: 1px solid var(--border) !important; }
  .menu-toggle { display: flex; }

  .hero { grid-template-columns: 1fr; padding-block: 44px; gap: 40px; }
  .portrait { justify-self: center; order: -1; max-width: 420px; }
  .hero h1 { font-size: clamp(3.2rem, 2.2rem + 10vw, 5.4rem); }
  .discipline-bar .wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

  .about { grid-template-columns: 1fr; gap: 30px; }
  .section-heading { display: block; }
  .section-heading > p { text-align: left; max-width: none; margin-top: 18px; }

  .internship { grid-template-columns: 1fr; gap: 12px; }
  .research-feature { grid-template-columns: 1fr; gap: 18px; padding: 30px; }
  .research-index { display: none; }
  .program-grid { grid-template-columns: 1fr 1fr; }

  .education-grid { grid-template-columns: 1fr; gap: 36px; }

  .achievement-highlights { grid-template-columns: 1fr; }
  .certificate-grid { grid-template-columns: repeat(2, 1fr); }

  .leadership-grid { grid-template-columns: 1fr; gap: 34px; }
  .service-grid { grid-template-columns: 1fr 1fr; }
  .life-gallery { grid-template-columns: 1fr 1fr 1fr; }

  .contact-main { flex-direction: column; align-items: flex-start; gap: 20px; }
  .contact-arrow { transform: rotate(45deg); }
}

@media (max-width: 560px) {
  .actions { flex-direction: column; align-items: stretch; }
  .button { justify-content: center; }
  .service-grid { grid-template-columns: 1fr; }
  .certificate-grid { grid-template-columns: 1fr 1fr; }
  .life-gallery { grid-template-columns: 1fr 1fr; }
  .program-grid { grid-template-columns: 1fr; }
  .detail-gallery { grid-template-columns: repeat(2, 1fr); }
  .image-nav { width: 38px; height: 38px; }
}

@media (max-width: 400px) {
  .wrap { width: calc(100% - 28px); }
  .brand-caption { display: none; }
  .cert-image { height: 140px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}