/* ==========================================================================
   Building Energy Informatics — Design System
   ========================================================================== */

:root {
  --color-primary: #0f3d5c;
  --color-primary-dark: #0a2a40;
  --color-primary-light: #e8f0f5;
  --color-accent: #1f9d6c;
  --color-accent-dark: #167a53;
  --color-accent-light: #e6f5ef;
  --color-ink: #1c2530;
  --color-muted: #5b6b7a;
  --color-faint: #8a97a3;
  --color-bg: #ffffff;
  --color-bg-alt: #f5f8fa;
  --color-bg-dark: #0a2438;
  --color-border: #e3e8ec;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(15, 61, 92, 0.08);
  --shadow-md: 0 8px 24px rgba(15, 61, 92, 0.10);
  --shadow-lg: 0 20px 48px rgba(10, 42, 64, 0.16);
  --container: 1180px;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-head: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.65;
  font-size: 16.5px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-accent-dark); }
h1, h2, h3, h4 { font-family: var(--font-head); color: var(--color-primary-dark); line-height: 1.2; margin: 0 0 0.6em; font-weight: 700; letter-spacing: -0.01em; }
h1 { font-size: clamp(2rem, 1.6rem + 1.8vw, 3.15rem); }
h2 { font-size: clamp(1.55rem, 1.35rem + 1vw, 2.25rem); }
h3 { font-size: 1.28rem; }
h4 { font-size: 1.05rem; }
p { margin: 0 0 1.1em; }
ul, ol { padding-left: 1.3em; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: 76px 0; }
.section-tight { padding: 48px 0; }
.section-alt { background: var(--color-bg-alt); }
.section-dark { background: var(--color-bg-dark); color: #cfe0ea; }
.section-dark h2, .section-dark h3 { color: #fff; }
.section-dark p { color: #a9c0cf; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--color-accent-dark); margin-bottom: 14px;
}
.eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--color-accent); display: inline-block; }
.lede { font-size: 1.15rem; color: var(--color-muted); max-width: 62ch; }
.text-center { text-align: center; }
.center-col { max-width: 720px; margin: 0 auto; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: var(--radius-sm); font-weight: 600; font-size: 0.98rem;
  border: 1.5px solid transparent; cursor: pointer; transition: all .15s ease;
}
.btn-primary { background: var(--color-accent); color: #fff; }
.btn-primary:hover { background: var(--color-accent-dark); color: #fff; }
.btn-outline { background: transparent; border-color: rgba(255,255,255,0.55); color: inherit; }
.btn-outline:hover { background: rgba(255,255,255,0.12); color: inherit; }
.btn-outline-dark { background: transparent; border-color: var(--color-primary); color: var(--color-primary); }
.btn-outline-dark:hover { background: var(--color-primary); color: #fff; }
.btn-block { width: 100%; }
.btn-sm { padding: 9px 18px; font-size: 0.88rem; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.96);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 12px 24px; max-width: var(--container); margin: 0 auto; gap: 24px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--color-primary-dark); font-size: 1.02rem; }
.brand img { height: 46px; width: auto; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text small { font-weight: 500; color: var(--color-muted); font-size: 0.68rem; letter-spacing: 0.04em; text-transform: uppercase; }

.main-nav { display: flex; align-items: center; gap: 2px; min-width: 0; }
.main-nav > ul { list-style: none; display: flex; align-items: center; gap: 0; margin: 0; padding: 0; }
.main-nav a.nav-link {
  display: flex; align-items: center; gap: 4px; white-space: nowrap;
  padding: 9px 10px; border-radius: var(--radius-sm); color: var(--color-ink); font-weight: 600; font-size: 0.87rem;
}
.brand { flex-shrink: 0; }
.header-cta { flex-shrink: 0; }
.main-nav a.nav-link:hover, .main-nav a.nav-link.is-active { background: var(--color-primary-light); color: var(--color-primary-dark); }
.has-dropdown { position: relative; }
.dropdown {
  position: absolute; top: calc(100% + 8px); left: 0; background: #fff; border: 1px solid var(--color-border);
  border-radius: var(--radius-md); box-shadow: var(--shadow-lg); min-width: 320px; padding: 10px;
  opacity: 0; visibility: hidden; transform: translateY(8px); transition: all .16s ease;
  display: grid; gap: 2px;
}
.has-dropdown:hover .dropdown, .has-dropdown:focus-within .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown a { display: flex; flex-direction: column; padding: 10px 12px; border-radius: var(--radius-sm); color: var(--color-ink); }
.dropdown a:hover { background: var(--color-bg-alt); }
.dropdown a span.d-desc { font-weight: 400; font-size: 0.8rem; color: var(--color-muted); margin-top: 2px; }
.dropdown a strong { font-size: 0.92rem; color: var(--color-primary-dark); }
.dropdown .dropdown-footer { border-top: 1px solid var(--color-border); margin-top: 6px; padding-top: 8px; }

.header-cta { display: flex; align-items: center; gap: 10px; }
.header-cta .btn { padding: 10px 18px; font-size: 0.9rem; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--color-primary-dark); margin: 5px 0; transition: .2s; }

@media (max-width: 1260px) {
  .main-nav { position: fixed; inset: 66px 0 0 0; background: #fff; flex-direction: column; align-items: stretch;
    padding: 10px 20px 30px; overflow-y: auto; transform: translateX(100%); transition: transform .22s ease; }
  .main-nav.is-open { transform: translateX(0); }
  .main-nav > ul { flex-direction: column; align-items: stretch; gap: 0; }
  .main-nav a.nav-link { padding: 14px 6px; border-bottom: 1px solid var(--color-border); border-radius: 0; white-space: normal; font-size: 0.95rem; }
  .dropdown { position: static; box-shadow: none; border: none; opacity: 1; visibility: visible; transform: none; display: none; padding-left: 12px; }
  .has-dropdown.is-open .dropdown { display: grid; }
  .nav-toggle { display: block; }
  .header-cta .btn-outline-dark { display: none; }
}

/* Hero */
.hero {
  background: linear-gradient(160deg, var(--color-bg-dark) 0%, var(--color-primary) 78%, var(--color-accent-dark) 130%);
  color: #fff; padding: 84px 0 90px; position: relative; overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(circle at 82% 20%, rgba(31,157,108,0.35), transparent 45%),
                     radial-gradient(circle at 10% 90%, rgba(255,255,255,0.08), transparent 40%);
  pointer-events: none;
}
.hero .container { position: relative; }
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 48px; align-items: center; }
.hero h1 { color: #fff; }
.hero .lede { color: #cfe0ea; }
.hero .eyebrow { color: #8fe0bd; }
.hero .eyebrow::before { background: #8fe0bd; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 28px; }
.hero-stats { display: flex; gap: 28px; margin-top: 40px; flex-wrap: wrap; }
.hero-stats div strong { display: block; font-size: 1.7rem; color: #fff; }
.hero-stats div span { font-size: 0.82rem; color: #9fb8c7; }
.hero-panel {
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.16); border-radius: var(--radius-lg);
  padding: 28px; backdrop-filter: blur(6px);
}
.hero-panel ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.hero-panel li { display: flex; gap: 12px; align-items: flex-start; color: #dceaf1; font-size: 0.95rem; }
.hero-panel li .ico { flex: none; width: 26px; height: 26px; border-radius: 8px; background: rgba(143,224,189,0.18); display: flex; align-items: center; justify-content: center; color: #8fe0bd; }
.page-hero { padding: 56px 0 60px; }
.page-hero .breadcrumb { color: #a9c0cf; font-size: 0.85rem; margin-bottom: 16px; }
.page-hero .breadcrumb a { color: #cfe0ea; }

/* Cards / Grids */
.grid { display: grid; gap: 26px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 980px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; } .hero-grid { grid-template-columns: 1fr; } }

.card {
  background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-md);
  padding: 28px; transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: transparent; }
.card .ico-badge {
  width: 46px; height: 46px; border-radius: 12px; background: var(--color-accent-light); color: var(--color-accent-dark);
  display: flex; align-items: center; justify-content: center; margin-bottom: 16px;
}
.card h3 { margin-bottom: 8px; font-size: 1.12rem; }
.card p { color: var(--color-muted); font-size: 0.94rem; margin-bottom: 12px; }
.card .card-link { font-weight: 700; font-size: 0.88rem; display: inline-flex; align-items: center; gap: 6px; }

.service-card { display: flex; flex-direction: column; height: 100%; }

.stat-card { text-align: center; padding: 30px 16px; }
.stat-card strong { display: block; font-size: 2.1rem; color: var(--color-primary-dark); }
.stat-card span { color: var(--color-muted); font-size: 0.9rem; }

/* Feature rows */
.check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.check-list li { display: flex; gap: 12px; align-items: flex-start; }
.check-list li .tick { flex: none; width: 22px; height: 22px; border-radius: 50%; background: var(--color-accent-light); color: var(--color-accent-dark); display: flex; align-items: center; justify-content: center; font-size: 0.75rem; margin-top: 2px; }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
@media (max-width: 860px) { .split { grid-template-columns: 1fr; gap: 32px; } }

.process-steps { counter-reset: step; display: grid; gap: 0; grid-template-columns: repeat(5, 1fr); }
@media (max-width: 980px) { .process-steps { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .process-steps { grid-template-columns: 1fr; } }
.process-step { position: relative; padding: 22px 16px 16px; border-left: 2px solid var(--color-border); }
.process-step::before { counter-increment: step; content: counter(step, decimal-leading-zero); font-weight: 800; font-size: 1.5rem; color: var(--color-accent); display: block; margin-bottom: 8px; }
.process-step h4 { margin-bottom: 6px; font-size: 0.98rem; }
.process-step p { font-size: 0.87rem; color: var(--color-muted); margin: 0; }

.pill-row { display: flex; flex-wrap: wrap; gap: 10px; }
.pill { background: var(--color-bg-alt); border: 1px solid var(--color-border); border-radius: 999px; padding: 8px 16px; font-size: 0.85rem; font-weight: 600; color: var(--color-primary-dark); }

/* Regions band */
.region-tabs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
@media (max-width: 980px) { .region-tabs { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .region-tabs { grid-template-columns: 1fr; } }
.region-card { border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 26px; background: #fff; }
.region-card .flag { font-size: 1.7rem; margin-bottom: 10px; display: block; }
.region-card h3 { font-size: 1.02rem; margin-bottom: 8px; }
.region-card p { font-size: 0.88rem; color: var(--color-muted); margin-bottom: 0; }

/* Team */
.team-card { text-align: left; }
.team-card .avatar { position: relative; overflow: hidden; width: 100%; aspect-ratio: 4/3; border-radius: var(--radius-md); background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent-light)); margin-bottom: 16px; }
.team-card .avatar-fallback { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; color: var(--color-primary); font-size: 2.4rem; font-weight: 800; }
.team-card .avatar-photo { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.team-card h3 { margin-bottom: 2px; }
.team-card .role { color: var(--color-accent-dark); font-weight: 700; font-size: 0.86rem; margin-bottom: 12px; display: block; }
.team-card p { color: var(--color-muted); font-size: 0.92rem; }

/* CTA band */
.cta-band { background: linear-gradient(120deg, var(--color-primary-dark), var(--color-primary)); color: #fff; border-radius: var(--radius-lg); padding: 52px; display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.cta-band h2 { color: #fff; margin-bottom: 8px; }
.cta-band p { color: #cfe0ea; margin: 0; }

/* Forms */
.form-grid { display: grid; gap: 18px; grid-template-columns: 1fr 1fr; }
.form-grid .full { grid-column: 1 / -1; }
@media (max-width: 640px) { .form-grid { grid-template-columns: 1fr; } }
label { display: block; font-weight: 600; font-size: 0.88rem; margin-bottom: 6px; color: var(--color-primary-dark); }
input, select, textarea {
  width: 100%; padding: 12px 14px; border: 1.5px solid var(--color-border); border-radius: var(--radius-sm);
  font-family: inherit; font-size: 0.95rem; background: #fff; color: var(--color-ink);
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--color-accent); }
.field-note { font-size: 0.78rem; color: var(--color-faint); margin-top: 4px; }
.hp-field { position: absolute; left: -9999px; opacity: 0; height: 0; width: 0; }
.form-status { padding: 14px 18px; border-radius: var(--radius-sm); margin-bottom: 20px; font-size: 0.92rem; font-weight: 600; }
.form-status.ok { background: var(--color-accent-light); color: var(--color-accent-dark); }
.form-status.err { background: #fdecec; color: #b3261e; }

/* Contact info cards */
.contact-methods { display: grid; gap: 16px; }
.contact-method { display: flex; gap: 14px; align-items: flex-start; padding: 18px; border: 1px solid var(--color-border); border-radius: var(--radius-md); }
.contact-method .ico-badge { margin-bottom: 0; }
.contact-method h4 { margin-bottom: 4px; }
.reveal-link { font-weight: 700; }

/* Table */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
th, td { padding: 12px 14px; border-bottom: 1px solid var(--color-border); text-align: left; }
th { color: var(--color-primary-dark); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.04em; }

/* Footer */
.site-footer { background: var(--color-bg-dark); color: #a9c0cf; padding: 64px 0 26px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; }
@media (max-width: 860px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .footer-grid { grid-template-columns: 1fr; } }
.site-footer h4 { color: #fff; font-size: 0.92rem; margin-bottom: 16px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.site-footer a { color: #a9c0cf; font-size: 0.92rem; }
.site-footer a:hover { color: #fff; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-brand img { height: 34px; filter: brightness(0) invert(1); opacity: 0.95; }
.footer-brand strong { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); margin-top: 46px; padding-top: 22px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 0.82rem; color: #7f97a7; }
.footer-bottom a { color: #7f97a7; }

/* Utility */
.mt-0 { margin-top: 0; } .mb-0 { margin-bottom: 0; }
.badge { display: inline-block; background: var(--color-primary-light); color: var(--color-primary-dark); font-size: 0.75rem; font-weight: 700; padding: 4px 10px; border-radius: 999px; margin-bottom: 10px; }
.skip-link { position: absolute; left: -999px; top: 0; background: #fff; padding: 10px 16px; z-index: 999; }
.skip-link:focus { left: 10px; top: 10px; }
.breadcrumb-alt { font-size: 0.85rem; color: var(--color-muted); margin-bottom: 14px; }