/* ============================================
   Trung tâm Chấn thương Chỉnh hình
   Phong cách: Johns Hopkins / Academic Medical
   Palette: Teal & White, học thuật, chuyên môn
   ============================================ */

:root {
  /* Brand colors - Johns Hopkins-inspired academic teal */
  --color-primary: #006666;          /* Deep teal */
  --color-primary-dark: #004d4d;     /* Darker teal for hover */
  --color-primary-light: #e6f0f0;    /* Pale teal background */
  --color-accent: #c5a572;           /* Muted gold for emphasis */

  /* Neutrals */
  --color-bg: #ffffff;
  --color-surface: #fafaf9;
  --color-surface-2: #f5f5f4;
  --color-border: #e7e5e4;
  --color-border-strong: #d6d3d1;

  /* Text */
  --color-text: #1c1917;             /* Near-black, warmer than pure black */
  --color-text-secondary: #44403c;
  --color-text-muted: #78716c;

  /* Typography */
  --font-serif: 'Source Serif 4', 'Source Serif Pro', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;

  /* Type scale */
  --text-xs: 0.75rem;     /* 12px */
  --text-sm: 0.875rem;    /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-lg: 1.125rem;    /* 18px */
  --text-xl: 1.5rem;      /* 24px */
  --text-2xl: 2rem;       /* 32px */
  --text-3xl: 2.75rem;    /* 44px */
  --text-hero: clamp(2.5rem, 5vw, 4rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 880px;
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08);
}

/* ============================================
   Reset & base
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  font-feature-settings: 'kern', 'liga', 'calt';
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
svg,
video {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
  text-underline-offset: 3px;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

h1 { font-size: var(--text-hero); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

p {
  margin-bottom: var(--space-4);
}

/* ============================================
   Top bar (utility navigation)
   ============================================ */
.topbar {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--text-xs);
  padding: var(--space-2) 0;
}

.topbar__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.topbar a {
  color: rgba(255, 255, 255, 0.9);
}

.topbar a:hover {
  color: #ffffff;
  text-decoration: none;
}

.topbar__contact {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.topbar__contact span::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 4px;
  background: var(--color-accent);
  border-radius: 50%;
  margin-right: var(--space-2);
  vertical-align: middle;
}

/* ============================================
   Header (primary navigation)
   ============================================ */
.header {
  background: #ffffff;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(8px);
  background: rgba(255, 255, 255, 0.96);
}

.header__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-6);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
}

.brand__logo {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__name {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.01em;
}

.brand__sub {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 2px;
}

.nav {
  display: flex;
  gap: var(--space-8);
  align-items: center;
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--space-2) 0;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

.nav__link:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  text-decoration: none;
}

.nav__link.is-active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.nav__cta {
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary);
  color: #ffffff;
  border-radius: var(--radius-sm);
  transition: background 0.2s;
}

.nav__cta:hover {
  background: var(--color-primary-dark);
  color: #ffffff;
  text-decoration: none;
}

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border-strong);
  padding: var(--space-2);
  cursor: pointer;
  border-radius: var(--radius-sm);
}

.menu-toggle svg {
  width: 24px;
  height: 24px;
  stroke: var(--color-text);
}

/* ============================================
   Hero
   ============================================ */
.hero {
  position: relative;
  padding: var(--space-24) 0 var(--space-20);
  background:
    linear-gradient(135deg, rgba(0, 102, 102, 0.92), rgba(0, 77, 77, 0.96)),
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><defs><pattern id='grid' width='10' height='10' patternUnits='userSpaceOnUse'><path d='M 10 0 L 0 0 0 10' fill='none' stroke='rgba(255,255,255,0.04)' stroke-width='0.5'/></pattern></defs><rect width='100' height='100' fill='url(%23grid)'/></svg>");
  color: #ffffff;
  overflow: hidden;
}

.hero__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.hero__eyebrow {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  padding: var(--space-2) var(--space-4);
  border: 1px solid rgba(197, 165, 114, 0.5);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-6);
}

.hero h1 {
  color: #ffffff;
  margin-bottom: var(--space-6);
  font-weight: 600;
}

.hero__lede {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.88);
  margin-bottom: var(--space-8);
  font-style: italic;
  max-width: 60ch;
}

.hero__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat__value {
  font-family: var(--font-serif);
  font-size: var(--text-3xl);
  font-weight: 600;
  color: var(--color-accent);
  line-height: 1;
}

.stat__label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.7);
  margin-top: var(--space-2);
}

/* Hero illustration */
.hero__visual {
  position: relative;
}

.hero__card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  backdrop-filter: blur(8px);
}

.hero__card h3 {
  color: var(--color-accent);
  font-size: var(--text-base);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-4);
  font-family: var(--font-sans);
  font-weight: 600;
}

.specialty-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.specialty-list li {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.92);
  padding-left: var(--space-4);
  position: relative;
}

.specialty-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 1px;
  background: var(--color-accent);
}

/* ============================================
   Section base
   ============================================ */
.section {
  padding: var(--space-24) 0;
}

.section--alt {
  background: var(--color-surface);
}

.section__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section__head {
  max-width: 720px;
  margin: 0 auto var(--space-16);
  text-align: center;
}

.section__eyebrow {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.section__title {
  margin-bottom: var(--space-4);
}

.section__lede {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Decorative rule */
.rule {
  width: 48px;
  height: 2px;
  background: var(--color-accent);
  margin: 0 auto var(--space-6);
}

/* ============================================
   About section
   ============================================ */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: start;
}

.about__intro h2 {
  margin-bottom: var(--space-6);
}

.about__intro p {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 55ch;
}

.principles {
  display: grid;
  gap: var(--space-6);
}

.principle {
  padding: var(--space-6);
  border-left: 3px solid var(--color-primary);
  background: var(--color-surface);
}

.principle h4 {
  font-size: var(--text-base);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
  font-family: var(--font-sans);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.principle p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.65;
}

/* ============================================
   Đội ngũ - Team
   ============================================ */
.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.team-card {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  transition: all 0.2s;
}

.team-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.team-card__avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary-light), #d0e0e0);
  margin: 0 auto var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  color: var(--color-primary);
  font-weight: 600;
}

.team-card__name {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  text-align: center;
  margin-bottom: var(--space-1);
}

.team-card__title {
  font-size: var(--text-sm);
  color: var(--color-primary);
  text-align: center;
  margin-bottom: var(--space-4);
  font-weight: 500;
}

.team-card__credentials {
  list-style: none;
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.team-card__credentials li {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  padding-left: var(--space-4);
  position: relative;
  line-height: 1.5;
}

.team-card__credentials li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

/* ============================================
   Services
   ============================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.service-card {
  background: #ffffff;
  border: 1px solid var(--color-border);
  padding: var(--space-8);
  border-radius: var(--radius-md);
  transition: all 0.2s;
  position: relative;
}

.service-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.service-card__num {
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  color: var(--color-accent);
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-3);
}

.service-card h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.service-card p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: var(--space-4);
}

.service-card__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

.service-card__list li {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  padding-left: var(--space-4);
  position: relative;
}

.service-card__list li::before {
  content: '+';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 600;
}

/* ============================================
   Process / Quy trình
   ============================================ */
.process {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-8);
}

.process-step {
  position: relative;
  padding: var(--space-6) var(--space-4);
  border-top: 2px solid var(--color-primary);
  background: #ffffff;
}

.process-step__num {
  font-family: var(--font-serif);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.process-step h4 {
  font-size: var(--text-base);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
  font-family: var(--font-sans);
  font-weight: 600;
}

.process-step p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ============================================
   Research / Nghiên cứu
   ============================================ */
.research__grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: var(--space-16);
  align-items: start;
}

.research__intro h2 {
  margin-bottom: var(--space-6);
}

.research__intro p {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.publications {
  list-style: none;
  display: flex;
  flex-direction: column;
}

.pub {
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--color-border);
}

.pub:first-child {
  padding-top: 0;
}

.pub:last-child {
  border-bottom: none;
}

.pub__meta {
  display: flex;
  gap: var(--space-4);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.pub__year {
  color: var(--color-primary);
  font-weight: 600;
}

.pub__title {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  color: var(--color-text);
  font-weight: 600;
  margin-bottom: var(--space-2);
  line-height: 1.4;
}

.pub__authors {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  font-style: italic;
  line-height: 1.5;
}

.pub__journal {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}

/* Research metrics */
.research-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-12);
  padding: var(--space-8) var(--space-6);
  background: var(--color-primary);
  color: #ffffff;
  border-radius: var(--radius-md);
}

.research-stats .stat__value {
  color: var(--color-accent);
}

.research-stats .stat__label {
  color: rgba(255, 255, 255, 0.85);
}

/* ============================================
   Training / Đào tạo
   ============================================ */
.training-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.training-card {
  background: #ffffff;
  border-top: 3px solid var(--color-primary);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

.training-card__type {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.training-card h4 {
  font-size: var(--text-base);
  margin-bottom: var(--space-3);
  line-height: 1.35;
}

.training-card__date {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.training-card p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ============================================
   Contact
   ============================================ */
.contact__grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: var(--space-16);
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.contact-item {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

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

.contact-item__icon {
  width: 40px;
  height: 40px;
  background: var(--color-primary-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-primary);
}

.contact-item__icon svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.5;
}

.contact-item__content h4 {
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: var(--space-1);
  font-family: var(--font-sans);
  font-weight: 600;
}

.contact-item__content p {
  font-size: var(--text-base);
  color: var(--color-text);
  margin: 0;
  line-height: 1.5;
}

.contact-item__content .meta {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* Form */
.form {
  background: var(--color-surface);
  padding: var(--space-8);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.form h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}

.form > p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.form-group {
  margin-bottom: var(--space-4);
}

.form-group label {
  display: block;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
  font-weight: 600;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--color-text);
  background: #ffffff;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 102, 102, 0.1);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.btn-submit {
  background: var(--color-primary);
  color: #ffffff;
  border: none;
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.2s;
  width: 100%;
}

.btn-submit:hover {
  background: var(--color-primary-dark);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.85);
  padding: var(--space-16) 0 var(--space-6);
}

.footer__grid {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--space-12);
}

.footer__brand h3 {
  color: #ffffff;
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
}

.footer__brand p {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.75);
}

.footer__col h4 {
  color: var(--color-accent);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-4);
  font-family: var(--font-sans);
  font-weight: 600;
}

.footer__col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer__col li {
  font-size: var(--text-sm);
  line-height: 1.5;
}

.footer__col a {
  color: rgba(255, 255, 255, 0.85);
}

.footer__col a:hover {
  color: #ffffff;
}

.footer__bottom {
  max-width: var(--container-max);
  margin: var(--space-12) auto 0;
  padding: var(--space-6) var(--space-6) 0;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.6);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .hero__inner,
  .about__grid,
  .research__grid,
  .contact__grid {
    grid-template-columns: 1fr;
    gap: var(--space-12);
  }

  .team-grid,
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

@media (max-width: 720px) {
  .nav,
  .topbar__contact {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .nav.is-open {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: #ffffff;
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    gap: var(--space-2);
    align-items: stretch;
  }

  .nav.is-open .nav__link {
    padding: var(--space-3);
    border-bottom: 1px solid var(--color-border);
    border-left: 2px solid transparent;
  }

  .nav.is-open .nav__link.is-active {
    border-bottom-color: var(--color-border);
    border-left-color: var(--color-primary);
    background: var(--color-primary-light);
  }

  .nav.is-open .nav__cta {
    margin-top: var(--space-2);
    text-align: center;
  }

  .section {
    padding: var(--space-16) 0;
  }

  .hero {
    padding: var(--space-16) 0;
  }

  .hero__stats,
  .research-stats {
    grid-template-columns: 1fr 1fr;
  }

  .team-grid,
  .services-grid,
  .training-grid,
  .process,
  .footer__grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .section__head {
    margin-bottom: var(--space-12);
  }
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}