/* ============================================
   HAMED ABDOLLAHI - PERSONAL ACADEMIC WEBSITE
   Unified stylesheet — single source of truth
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Libre+Baskerville:ital,wght@0,400;0,700;1,400&family=Source+Sans+3:wght@300;400;500;600;700&display=swap');

/* ─── CSS VARIABLES ─────────────────────────── */
:root {
  --navy:       #1a2f4e;
  --navy-light: #24415e;
  --teal:       #0d9488;
  --teal-light: #14b8a6;
  --teal-pale:  #ccfbf1;
  --white:      #ffffff;
  --off-white:  #f8fafc;
  --gray-100:   #f1f5f9;
  --gray-200:   #e2e8f0;
  --gray-400:   #94a3b8;
  --gray-600:   #475569;
  --gray-800:   #1e293b;
  --text:       #1e293b;
  --text-muted: #64748b;
  --border:     #e2e8f0;

  --font-serif: 'Libre Baskerville', Georgia, serif;
  --font-sans:  'Source Sans 3', system-ui, sans-serif;

  --shadow-sm:  0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md:  0 4px 12px rgba(0,0,0,.08), 0 2px 6px rgba(0,0,0,.04);
  --shadow-lg:  0 10px 30px rgba(0,0,0,.10), 0 4px 12px rgba(0,0,0,.06);

  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;

  --transition: 0.2s ease;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a  { color: var(--teal); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--teal-light); }

/* ─── TYPOGRAPHY ────────────────────────────── */
h1, h2, h3, h4, h5 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.3;
  color: var(--navy);
}

h1 { font-size: clamp(2rem, 4vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.6rem); }
h4 { font-size: 1.2rem; }
h5 { font-size: 1rem; }

p { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

ul, ol { padding-left: 1.4rem; }
li { margin-bottom: .35rem; }

/* ─── NAVIGATION ────────────────────────────── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--navy);
  box-shadow: 0 2px 12px rgba(0,0,0,.18);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: .75rem;
  text-decoration: none;
}

.nav-brand img {
  height: 40px;
  width: 40px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--teal);
}

.nav-brand-name {
  font-family: var(--font-serif);
  color: var(--white);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.2;
}

.nav-brand-title {
  color: var(--teal-light);
  font-size: .72rem;
  font-family: var(--font-sans);
  font-weight: 500;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: .25rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-links a {
  color: rgba(255,255,255,.82);
  font-size: .88rem;
  font-weight: 500;
  padding: .45rem .75rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
  letter-spacing: .01em;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--white);
  background: rgba(13,148,136,.25);
}

.nav-links a.active {
  color: var(--teal-light);
}

/* hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: .5rem;
  color: var(--white);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  margin: 5px 0;
  transition: all var(--transition);
}

/* ─── HERO ──────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 60%, #1e4a5e 100%);
  color: var(--white);
  padding: 5rem 2rem 4rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 80% at 70% 50%, rgba(13,148,136,.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 3rem;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  background: rgba(13,148,136,.2);
  border: 1px solid rgba(13,148,136,.4);
  color: var(--teal-light);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: .3rem .9rem;
  border-radius: 100px;
  margin-bottom: 1.25rem;
}

.hero-name {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  color: var(--white);
  line-height: 1.15;
  margin-bottom: .5rem;
}

.hero-degrees {
  color: var(--teal-light);
  font-weight: 600;
  font-size: 1.05rem;
  margin-bottom: 1.2rem;
  font-family: var(--font-sans);
}

.hero-tagline {
  font-size: 1.1rem;
  color: rgba(255,255,255,.8);
  max-width: 560px;
  line-height: 1.65;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .65rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: .9rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
  font-family: var(--font-sans);
}

.btn-primary {
  background: var(--teal);
  color: var(--white);
}
.btn-primary:hover {
  background: var(--teal-light);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(13,148,136,.4);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 1.5px solid rgba(255,255,255,.5);
}
.btn-outline:hover {
  border-color: var(--teal-light);
  color: var(--teal-light);
}

.hero-photo {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid rgba(13,148,136,.5);
  box-shadow: 0 0 0 8px rgba(13,148,136,.1);
  flex-shrink: 0;
}

.hero-socials {
  display: flex;
  gap: .75rem;
  margin-top: 1.5rem;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,.08);
  color: rgba(255,255,255,.75);
  font-size: .95rem;
  transition: all var(--transition);
  border: 1px solid rgba(255,255,255,.12);
}
.social-link:hover {
  background: var(--teal);
  color: var(--white);
  border-color: var(--teal);
}

/* ─── SECTION WRAPPER ───────────────────────── */
.section {
  padding: 5rem 2rem;
}

.section-alt {
  background: var(--off-white);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-label {
  display: inline-block;
  color: var(--teal);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  margin-bottom: .6rem;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  color: var(--navy);
  margin-bottom: .8rem;
}

.section-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 640px;
  margin: 0 auto;
}

/* divider accent */
.divider {
  width: 48px;
  height: 3px;
  background: var(--teal);
  border-radius: 2px;
  margin: .75rem auto 0;
}

/* ─── CARDS ─────────────────────────────────── */
.card-grid {
  display: grid;
  gap: 1.5rem;
}

.card-grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.card-grid-3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card-grid-4 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--teal-pale);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--teal-pale);
  color: var(--teal);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--navy);
  margin-bottom: .5rem;
}

.card-text {
  color: var(--text-muted);
  font-size: .93rem;
  line-height: 1.65;
}

.card-list {
  list-style: none;
  padding: 0;
  margin-top: .75rem;
}

.card-list li {
  font-size: .88rem;
  color: var(--text-muted);
  padding: .25rem 0;
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  align-items: flex-start;
  gap: .5rem;
}

.card-list li:last-child { border-bottom: none; }

.card-list li::before {
  content: '›';
  color: var(--teal);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: .05rem;
}

/* ─── STANDARDS STRIP ───────────────────────── */
.standards-strip {
  background: var(--navy);
  padding: 2.5rem 2rem;
}

.standards-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.standards-title {
  text-align: center;
  color: rgba(255,255,255,.6);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.standards-grid {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  justify-content: center;
}

.standard-badge {
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius-sm);
  padding: .5rem 1rem;
  color: rgba(255,255,255,.8);
  font-size: .8rem;
  font-weight: 600;
  white-space: nowrap;
  transition: all var(--transition);
}

.standard-badge:hover {
  background: rgba(13,148,136,.2);
  border-color: rgba(13,148,136,.4);
  color: var(--teal-light);
}

/* ─── EXPERTISE SECTION ─────────────────────── */
.expertise-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  border-top: 3px solid transparent;
}

.expertise-card:hover {
  border-top-color: var(--teal);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.expertise-card h3 {
  font-size: 1.15rem;
  margin-bottom: .6rem;
}

.expertise-tag {
  display: inline-flex;
  background: var(--teal-pale);
  color: var(--teal);
  font-size: .75rem;
  font-weight: 600;
  padding: .2rem .65rem;
  border-radius: 100px;
  margin-bottom: .9rem;
  letter-spacing: .03em;
}

/* ─── PUBLICATION CARDS ─────────────────────── */
.pub-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-left: 4px solid var(--teal);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.75rem 2rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.pub-card:hover {
  box-shadow: var(--shadow-md);
  border-left-color: var(--navy);
}

.pub-venue {
  display: inline-flex;
  align-items: center;
  background: var(--teal-pale);
  color: var(--teal);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  padding: .25rem .75rem;
  border-radius: 100px;
  margin-bottom: .8rem;
}

.pub-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: var(--navy);
  line-height: 1.45;
  margin-bottom: .5rem;
}

.pub-authors {
  font-size: .88rem;
  color: var(--text-muted);
  margin-bottom: .9rem;
  line-height: 1.5;
}

.pub-authors strong {
  color: var(--navy);
  font-weight: 600;
}

.pub-abstract {
  font-size: .88rem;
  color: var(--gray-600);
  line-height: 1.65;
  margin-bottom: 1rem;
  padding: 1rem;
  background: var(--off-white);
  border-radius: var(--radius-sm);
  border-left: 2px solid var(--gray-200);
}

.pub-links {
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
}

.pub-link {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-size: .8rem;
  font-weight: 600;
  color: var(--teal);
  border: 1.5px solid var(--teal);
  padding: .3rem .85rem;
  border-radius: 100px;
  transition: all var(--transition);
}

.pub-link:hover {
  background: var(--teal);
  color: var(--white);
}

/* ─── INSTRUMENT / SERVICE CARDS ────────────── */
.instrument-card {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.instrument-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--teal-pale);
}

.instrument-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--teal-pale);
  color: var(--teal);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.instrument-name {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--navy);
  margin-bottom: .3rem;
}

.instrument-desc {
  font-size: .88rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin: 0;
}

/* ─── TEACHING CARDS ────────────────────────── */
.course-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin-bottom: 2rem;
}

.course-header {
  background: var(--navy);
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  flex-wrap: wrap;
}

.course-code {
  font-size: .8rem;
  font-weight: 700;
  color: var(--teal-light);
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: .3rem;
}

.course-title {
  color: var(--white);
  font-family: var(--font-serif);
  font-size: 1.15rem;
  margin: 0;
}

.course-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: .3rem;
}

.course-badge {
  background: rgba(13,148,136,.2);
  color: var(--teal-light);
  font-size: .75rem;
  font-weight: 600;
  padding: .25rem .75rem;
  border-radius: 100px;
  border: 1px solid rgba(13,148,136,.3);
  white-space: nowrap;
}

.course-body {
  padding: 2rem;
}

.course-info-row {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.course-info-item {
  display: flex;
  align-items: center;
  gap: .4rem;
  font-size: .85rem;
  color: var(--text-muted);
}

.course-info-item i {
  color: var(--teal);
}

.course-desc {
  color: var(--text-muted);
  font-size: .93rem;
  line-height: 1.7;
  margin-bottom: 1.25rem;
}

.topic-list {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: .4rem .75rem;
}

.topic-list li {
  font-size: .85rem;
  color: var(--gray-600);
  display: flex;
  align-items: center;
  gap: .5rem;
  margin: 0;
}

.topic-list li::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--teal);
  border-radius: 50%;
  flex-shrink: 0;
}

/* ─── ABOUT PAGE ────────────────────────────── */
.about-layout {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3.5rem;
  align-items: start;
}

.about-sidebar {
  position: sticky;
  top: 80px;
}

.about-photo {
  width: 100%;
  border-radius: var(--radius-lg);
  aspect-ratio: 3/4;
  object-fit: cover;
  box-shadow: var(--shadow-lg);
  margin-bottom: 1.5rem;
}

.about-contact-card {
  background: var(--off-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: .7rem;
  padding: .5rem 0;
  border-bottom: 1px solid var(--border);
  font-size: .88rem;
  color: var(--text-muted);
}

.contact-item:last-child { border-bottom: none; }

.contact-item i {
  color: var(--teal);
  width: 16px;
  text-align: center;
  flex-shrink: 0;
}

.contact-item a {
  color: var(--text-muted);
}

.contact-item a:hover { color: var(--teal); }

/* ─── SKILLS / TAGS ─────────────────────────── */
.tag-group {
  margin-bottom: 1.5rem;
}

.tag-group-label {
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--navy);
  margin-bottom: .6rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
}

.tag {
  background: var(--gray-100);
  color: var(--gray-600);
  font-size: .8rem;
  font-weight: 500;
  padding: .25rem .7rem;
  border-radius: 100px;
  border: 1px solid var(--gray-200);
}

.tag-teal {
  background: var(--teal-pale);
  color: var(--teal);
  border-color: rgba(13,148,136,.2);
}

/* ─── CONTACT FORM ──────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: .88rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: .45rem;
}

.form-control {
  width: 100%;
  padding: .65rem 1rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: .93rem;
  color: var(--text);
  background: var(--white);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-control:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(13,148,136,.12);
}

textarea.form-control {
  resize: vertical;
  min-height: 130px;
}

/* ─── FOOTER ────────────────────────────────── */
.site-footer {
  background: var(--gray-800);
  color: rgba(255,255,255,.65);
  padding: 2.5rem 2rem;
  text-align: center;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.footer-name {
  color: var(--white);
  font-family: var(--font-serif);
  font-size: 1.05rem;
  margin-bottom: .4rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.footer-links a {
  color: rgba(255,255,255,.55);
  font-size: .85rem;
  transition: color var(--transition);
}

.footer-links a:hover { color: var(--teal-light); }

.footer-copy {
  font-size: .8rem;
  color: rgba(255,255,255,.4);
}

/* ─── PAGE BANNER ───────────────────────────── */
.page-banner {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  padding: 3.5rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 80% at 50% 100%, rgba(13,148,136,.15) 0%, transparent 70%);
}

.page-banner-label {
  color: var(--teal-light);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  margin-bottom: .5rem;
  position: relative;
}

.page-banner-title {
  color: var(--white);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin-bottom: .6rem;
  position: relative;
}

.page-banner-sub {
  color: rgba(255,255,255,.65);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

/* ─── CALLOUT BOX ───────────────────────────── */
.callout {
  background: var(--teal-pale);
  border: 1px solid rgba(13,148,136,.2);
  border-left: 4px solid var(--teal);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}

.callout p { margin: 0; font-size: .93rem; color: var(--gray-800); }

/* ─── TIMELINE ──────────────────────────────── */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: .5rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--teal-pale);
}

.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.65rem;
  top: .35rem;
  width: 12px;
  height: 12px;
  background: var(--teal);
  border-radius: 50%;
  border: 2px solid var(--white);
  box-shadow: 0 0 0 2px var(--teal);
}

.timeline-date {
  font-size: .8rem;
  font-weight: 700;
  color: var(--teal);
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-bottom: .25rem;
}

.timeline-title {
  font-size: 1.05rem;
  font-family: var(--font-serif);
  color: var(--navy);
  margin-bottom: .4rem;
}

.timeline-desc {
  font-size: .9rem;
  color: var(--text-muted);
}

/* ─── STAT CHIPS ────────────────────────────── */
.stat-chips {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.stat-chip {
  background: var(--off-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .75rem 1.25rem;
  text-align: center;
  min-width: 90px;
}

.stat-chip-value {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1;
  display: block;
}

.stat-chip-label {
  font-size: .72rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  display: block;
  margin-top: .2rem;
}

/* ─── COMPUTATIONAL PAGE ────────────────────── */
.tool-grid {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.tool-chip {
  display: flex;
  align-items: center;
  gap: .4rem;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .4rem .85rem;
  font-size: .83rem;
  font-weight: 500;
  color: var(--gray-600);
  box-shadow: var(--shadow-sm);
}

.tool-chip img {
  width: 18px;
  height: 18px;
  object-fit: contain;
}

/* ─── RESPONSIVE ────────────────────────────── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open { display: flex; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: var(--navy); padding: 1rem; }
  .nav-toggle { display: block; }

  .hero-inner { grid-template-columns: 1fr; }
  .hero-photo { width: 130px; height: 130px; order: -1; }
  .hero { padding: 3rem 1.5rem 2.5rem; }

  .about-layout { grid-template-columns: 1fr; }
  .about-sidebar { position: static; }
  .about-photo { aspect-ratio: 4/3; }

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

  .section { padding: 3.5rem 1.25rem; }
  .course-header { flex-direction: column; }
  .course-meta { align-items: flex-start; }
}

@media (max-width: 480px) {
  .stat-chips { gap: .6rem; }
  .stat-chip { min-width: 75px; padding: .6rem 1rem; }
  .stat-chip-value { font-size: 1.25rem; }
}