/* ==========================================================================
   ALQEVON HEALTH LTD — CORPORATE & INSTITUTIONAL MASTER DESIGN SYSTEM
   Precision British Healthcare Asset Management & Clinical Engineering
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=Newsreader:ital,opsz,wght@0,6..72,400;0,6..72,500;0,6..72,600;1,6..72,400;1,6..72,500&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root {
  /* Institutional British Palette */
  --oxford-950: #040c18;
  --oxford-900: #08162b;
  --oxford-850: #0d203d;
  --oxford-800: #132a4e;

  --clinical-700: #09534c;
  --clinical-600: #0c776e;
  --clinical-500: #0f9287;
  --clinical-100: #d5f4f0;
  --clinical-50:  #f0faf9;

  --slate-900: #0f172a;
  --slate-800: #1e293b;
  --slate-700: #334155;
  --slate-600: #475569;
  --slate-500: #64748b;
  --slate-400: #94a3b8;
  --slate-300: #cbd5e1;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --slate-50:  #f8fafc;
  --white:     #ffffff;
  --bone:      #fbfbfc;

  /* Typography */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Newsreader', Georgia, serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Container */
  --max-w: 1220px;
  --radius-sm: 6px;
  --radius-md: 10px;

  --shadow-card: 0 4px 20px -2px rgba(8, 22, 43, 0.06), 0 2px 6px -1px rgba(8, 22, 43, 0.03);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bone);
  color: var(--slate-800);
  line-height: 1.6;
}

h1, h2, h3, h4 {
  color: var(--oxford-950);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.18;
}

h1 { font-size: clamp(2.1rem, 3.6vw, 3.2rem); font-weight: 800; }
h2 { font-size: clamp(1.6rem, 2.6vw, 2.3rem); font-weight: 700; }
h3 { font-size: 1.25rem; font-weight: 600; }

.serif-italic {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  color: var(--clinical-600);
}

p {
  color: var(--slate-600);
  font-size: 1rem;
}

.container {
  width: 100%;
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section {
  padding: 5rem 0;
}

.section-alt {
  background-color: var(--slate-50);
  border-top: 1px solid var(--slate-200);
  border-bottom: 1px solid var(--slate-200);
}

/* Badges */
.badge-institution {
  display: inline-block;
  padding: 0.35rem 0.8rem;
  background-color: var(--oxford-850);
  color: var(--clinical-100);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-sm);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1.2rem;
}

.badge-clinical {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  background-color: var(--clinical-50);
  color: var(--clinical-700);
  border: 1px solid rgba(12, 119, 110, 0.25);
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

/* ==========================================================================
   CLEAN NON-OVERLAPPING HEADER
   ========================================================================== */
.site-header {
  position: relative;
  background-color: var(--white);
  border-bottom: 1px solid var(--slate-200);
  padding: 1.1rem 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-crest {
  width: 36px;
  height: 36px;
  background: var(--oxford-900);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clinical-500);
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--oxford-950);
  white-space: nowrap;
}
.brand-title span {
  font-weight: 500;
  color: var(--clinical-600);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.8rem;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--slate-700);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s ease;
}
.nav-link:hover {
  color: var(--clinical-600);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex-shrink: 0;
}

.mobile-nav-toggle {
  display: none;
  background: var(--slate-100);
  border: 1px solid var(--slate-300);
  border-radius: var(--radius-sm);
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--oxford-900);
  color: var(--white);
}
.btn-primary:hover {
  background-color: var(--oxford-850);
}

.btn-clinical {
  background-color: var(--clinical-600);
  color: var(--white);
}
.btn-clinical:hover {
  background-color: var(--clinical-700);
}

.btn-secondary {
  background-color: var(--white);
  color: var(--slate-800);
  border-color: var(--slate-300);
}
.btn-secondary:hover {
  background-color: var(--slate-100);
}

.btn-sm {
  padding: 0.5rem 1.1rem;
  font-size: 0.84rem;
}

/* ==========================================================================
   HERO SECTION (DESKTOP + MOBILE)
   ========================================================================== */
.hero-corporate {
  padding: 4.5rem 0 5rem 0;
  border-bottom: 1px solid var(--slate-200);
  background: radial-gradient(circle at 90% 10%, rgba(12, 119, 110, 0.04) 0%, transparent 45%), var(--bone);
}

.hero-grid-corp {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: start;
}

.hero-statement {
  margin-bottom: 1.2rem;
}

.hero-text {
  font-size: 1.12rem;
  color: var(--slate-600);
  line-height: 1.65;
  margin-bottom: 2rem;
  max-width: 580px;
}

.hero-btn-group {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

/* 3-Metric Credentials Bar */
.hero-credentials-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--slate-200);
}

.cred-metric {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--oxford-950);
  line-height: 1.1;
}

.cred-desc {
  font-size: 0.82rem;
  color: var(--slate-500);
  line-height: 1.35;
  margin-top: 0.35rem;
}

/* Assurance Card */
.assurance-card {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  padding: 2.2rem;
  box-shadow: var(--shadow-card);
}

.assurance-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1rem;
  margin-bottom: 1.4rem;
  border-bottom: 1px solid var(--slate-200);
}

.assurance-title {
  color: var(--oxford-950);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.assurance-list {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.assurance-item {
  border-left: 3px solid var(--clinical-600);
  padding-left: 1rem;
}
.assurance-item.dark {
  border-left-color: var(--oxford-900);
}

.assurance-item strong {
  color: var(--oxford-950);
  display: block;
  font-size: 0.95rem;
  margin-bottom: 0.2rem;
}
.assurance-item span {
  color: var(--slate-500);
  font-size: 0.88rem;
  line-height: 1.45;
}

.assurance-footer {
  margin-top: 1.8rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--slate-100);
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--slate-500);
}

/* Protocol Grid */
.protocol-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.4rem;
  margin-top: 2.5rem;
}

.protocol-card {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-sm);
  padding: 1.6rem;
}

.protocol-step-num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--clinical-600);
  margin-bottom: 0.6rem;
  text-transform: uppercase;
}

.protocol-card h4 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.protocol-card p {
  font-size: 0.88rem;
  line-height: 1.5;
}

/* Spec Table */
.spec-table-container {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-sm);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-top: 2rem;
}

.spec-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.spec-table th {
  background-color: var(--oxford-900);
  color: var(--white);
  padding: 0.9rem 1.1rem;
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.spec-table td {
  padding: 1rem 1.1rem;
  border-bottom: 1px solid var(--slate-200);
  color: var(--slate-700);
  vertical-align: middle;
}

.spec-table tr:hover {
  background-color: var(--slate-50);
}

.spec-table .item-title {
  font-weight: 700;
  color: var(--oxford-950);
}

/* Footer */
.corp-footer {
  background-color: var(--oxford-950);
  color: var(--slate-300);
  padding: 4.5rem 0 2rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.corp-footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.corp-footer-col h5 {
  color: var(--white);
  font-size: 0.88rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 1.1rem;
}

.corp-footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}
.corp-footer-links a {
  color: var(--slate-400);
  font-size: 0.88rem;
  text-decoration: none;
}
.corp-footer-links a:hover {
  color: var(--clinical-100);
}

.corp-footer-bottom {
  padding-top: 1.8rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--slate-500);
  flex-wrap: wrap;
  gap: 1rem;
}

/* Modal */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(4, 12, 24, 0.85);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  padding: 1.2rem;
}
.modal-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  background: var(--white);
  border-radius: var(--radius-sm);
  max-width: 540px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  border: 1px solid var(--slate-300);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.modal-header {
  padding: 1.2rem 1.5rem;
  background-color: var(--slate-50);
  border-bottom: 1px solid var(--slate-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--oxford-950);
}
.modal-close-btn {
  background: none;
  border: none;
  font-size: 1.4rem;
  color: var(--slate-400);
  cursor: pointer;
}

.modal-body {
  padding: 1.5rem;
}

.form-group {
  margin-bottom: 1.1rem;
}
.form-group label {
  display: block;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--slate-800);
  margin-bottom: 0.3rem;
}
.form-control {
  width: 100%;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--slate-300);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  outline: none;
}
.form-control:focus {
  border-color: var(--oxford-900);
  box-shadow: 0 0 0 2px rgba(8, 22, 43, 0.1);
}

/* ==========================================================================
   RESPONSIVE (DESKTOP VS MOBILE)
   ========================================================================== */
@media (max-width: 992px) {
  .hero-grid-corp {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .protocol-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .corp-footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--white);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.2rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid var(--slate-200);
  }
  .nav-menu.mobile-open {
    display: flex;
  }

  .mobile-nav-toggle {
    display: flex;
  }

  .header-actions .btn {
    display: none;
  }

  .section {
    padding: 3.5rem 0;
  }

  .hero-corporate {
    padding: 2.8rem 0 3.5rem 0;
  }

  .hero-credentials-bar {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }

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

  .corp-footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .assurance-card {
    padding: 1.5rem;
  }
}