/* =====================================================
   ARCHE — Design System Stylesheet
   Evidence Integration Labs / ARCHEMENTOR
   ===================================================== */

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

*, *::before, *::after { box-sizing: border-box; }

:root {
  /* Brand */
  --navy:          #1B3A52;
  --navy-light:    #2A5476;
  --navy-dark:     #0F2337;
  --blue:          #1E40AF;
  --blue-mid:      #3B82F6;
  --blue-light:    #DBEAFE;
  --blue-50:       #EFF6FF;
  --teal:          #0891B2;
  --teal-dark:     #0E7490;
  --teal-light:    #CFFAFE;

  /* Legacy compat aliases */
  --blue-dark:     #1D3DA4;
  --blue-nav:      var(--navy-dark);
  --green:         #059669;
  --green-mid:     #28a745;
  --green-dk:      #047857;
  --green-bg:      #DCFCE7;
  --amber:         #D97706;
  --amber-bg:      #FEF9C3;
  --red:           #DC2626;
  --red-bg:        #FEE2E2;

  /* Neutrals */
  --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;

  /* Traffic Light */
  --tl-low:        #059669;
  --tl-low-bg:     #DCFCE7;
  --tl-low-bdr:    #86EFAC;
  --tl-some:       #D97706;
  --tl-some-bg:    #FEF9C3;
  --tl-some-bdr:   #FDE047;
  --tl-high:       #DC2626;
  --tl-high-bg:    #FEE2E2;
  --tl-high-bdr:   #FCA5A5;

  /* Semantic */
  --bg:            var(--slate-50);
  --text:          var(--slate-900);
  --muted:         var(--slate-500);
  --border:        var(--slate-200);
  --white:         #ffffff;
  --radius:        10px;
  --shadow-sm:     0 1px 3px rgba(0,0,0,0.08),0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:     0 4px 12px rgba(0,0,0,0.10),0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg:     0 10px 24px rgba(0,0,0,0.12),0 4px 8px rgba(0,0,0,0.06);
  --shadow:        var(--shadow-sm);
  --max-w:         860px;
  --max-w-lg:      1100px;

  /* Typography */
  --font-display:  'Libre Baskerville', Georgia, serif;
  --font-body:     'Lora', Georgia, serif;
  --font-ui:       'Inter', system-ui, sans-serif;
  --font-mono:     'JetBrains Mono', monospace;
}

body {
  font-family: var(--font-body);
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ── Header ─────────────────────────────────────────── */
header {
  background: var(--navy);
  color: #fff;
  padding: 0;
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 24px;
  max-width: var(--max-w-lg);
  margin: 0 auto;
}
.header-inner .logo {
  height: 100px;
  width: auto;
  flex-shrink: 0;
  filter: brightness(1) invert(0);
}
.header-inner h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

/* ── Nav ─────────────────────────────────────────────── */
nav {
  background: var(--navy-dark);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}
.nav-inner {
  max-width: var(--max-w-lg);
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  list-style: none;
  margin: 0; padding: 0;
}
.nav-links a {
  display: block;
  color: rgba(255,255,255,0.65);
  text-decoration: none;
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  padding: 12px 13px;
  transition: all 180ms ease;
  white-space: nowrap;
  letter-spacing: 0.01em;
}
.nav-links a:hover {
  color: #fff;
  background: rgba(255,255,255,0.1);
  border-radius: 5px;
}
.nav-links a.active {
  color: #fff;
  background: rgba(255,255,255,0.12);
  border-bottom: 2px solid var(--teal);
  border-radius: 5px 5px 0 0;
}
.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px 6px;
  flex-direction: column;
  gap: 5px;
}
.nav-hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all 0.25s;
}

/* ── Main content ─────────────────────────────────────── */
main {
  max-width: var(--max-w);
  margin: 32px auto;
  padding: 28px 24px;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
main.wide {
  max-width: var(--max-w-lg);
}

h2 {
  font-family: var(--font-display);
  color: var(--navy);
  margin-top: 1.4em;
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
h3 {
  font-family: var(--font-display);
  color: var(--navy);
  font-size: 1.1rem;
  font-weight: 700;
}
h4 {
  font-family: var(--font-ui);
  color: var(--navy);
  font-size: 1rem;
  font-weight: 600;
}
h2:first-child, h3:first-child { margin-top: 0; }

p { font-family: var(--font-body); line-height: 1.65; }

a { color: var(--blue); }
a:hover { color: var(--navy); }

/* ── CTA Button ── */
.btn-cta {
  display: inline-block;
  background: var(--teal);
  color: #fff;
  padding: 12px 24px;
  border-radius: 7px;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  margin-top: 20px;
  transition: all 180ms ease;
  box-shadow: 0 4px 12px rgba(8,145,178,0.35);
}
.btn-cta:hover { background: var(--teal-dark); color: #fff; transform: translateY(-1px); }

/* ── Section spacing ── */
.section-block { margin-bottom: 28px; }

/* ── Cards ── */
.card {
  border: 1px solid var(--slate-200);
  border-radius: var(--radius);
  margin-bottom: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.card-header {
  background: var(--slate-50);
  padding: 10px 16px;
  font-family: var(--font-ui);
  font-weight: 700;
  color: var(--navy);
  border-bottom: 1px solid var(--slate-200);
}
.card-body { padding: 14px 16px; }
.card-body ul { margin: 0; padding-left: 20px; }

/* ── Footer ─────────────────────────────────────────── */
footer {
  background: var(--navy-dark);
  color: rgba(255,255,255,0.65);
  text-align: center;
  padding: 24px 20px;
  margin-top: 0;
  font-family: var(--font-ui);
  font-size: 0.85rem;
}
footer a { color: rgba(255,255,255,0.5); text-decoration: none; }
footer a:hover { color: #fff; text-decoration: underline; }

/* ── Back to top ── */
#backToTop {
  display: none;
  position: fixed;
  bottom: 24px; right: 20px;
  background: var(--navy);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 42px; height: 42px;
  font-size: 18px;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
  z-index: 100;
  transition: background 180ms;
}
#backToTop:hover { background: var(--navy-light); }

/* ── Subscribe form ── */
.subscribe-box {
  background: var(--blue-50);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  margin-bottom: 28px;
  border: 1px solid var(--blue-light);
}
.subscribe-box input[type="email"] {
  padding: 10px 14px;
  border: 1px solid var(--slate-300);
  border-radius: 6px;
  font-size: 1rem;
  font-family: var(--font-ui);
  width: min(300px, 100%);
  margin: 8px 4px;
}
.subscribe-box button {
  padding: 10px 22px;
  background: var(--navy);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 700;
  font-family: var(--font-ui);
  cursor: pointer;
  margin: 8px 4px;
  transition: background 180ms;
}
.subscribe-box button:hover { background: var(--navy-light); }

/* ── Blog cards ── */
.blog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.blog-card {
  border: 1px solid var(--slate-200);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  box-shadow: var(--shadow-sm);
  display: flex; flex-direction: column;
  transition: all 200ms ease;
}
.blog-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.blog-card-header {
  background: var(--slate-50);
  padding: 14px 16px;
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--navy);
  border-bottom: 1px solid var(--slate-200);
}
.blog-card-body { padding: 14px 16px; flex: 1; display: flex; flex-direction: column; gap: 10px; }
.blog-card-body p { margin: 0; flex: 1; font-family: var(--font-body); font-size: 0.92rem; }
.blog-card-body a.read-more {
  display: inline-block;
  background: var(--navy);
  color: #fff;
  padding: 8px 16px;
  border-radius: 6px;
  font-family: var(--font-ui);
  font-weight: 700;
  text-decoration: none;
  font-size: 0.88rem;
  align-self: flex-start;
  transition: background 180ms;
}
.blog-card-body a.read-more:hover { background: var(--navy-light); }

/* ── Contact form ── */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-family: var(--font-ui); font-weight: 600; margin-bottom: 6px; color: var(--slate-700); }
.form-group input, .form-group textarea, .form-group select {
  width: 100%;
  padding: 10px 12px;
  border: 1.5px solid var(--slate-200);
  border-radius: 7px;
  font-size: 0.95rem;
  font-family: var(--font-ui);
  background: var(--slate-50);
  color: var(--slate-900);
  transition: border-color 180ms, box-shadow 180ms;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(30,64,175,0.12);
}
.form-group textarea { resize: vertical; }
.btn-submit {
  background: var(--navy);
  color: #fff;
  border: none;
  padding: 12px 28px;
  border-radius: 7px;
  font-size: 0.95rem;
  font-family: var(--font-ui);
  font-weight: 700;
  cursor: pointer;
  transition: background 180ms;
}
.btn-submit:hover { background: var(--navy-light); }

/* ── Appraisal tool ─────────────────────────────────── */
.step-section { display: none; }
.step-section.active { display: block; animation: fadeUp 0.3s ease; }
@keyframes fadeUp { from { opacity:0; transform:translateY(8px); } to { opacity:1; transform:none; } }

/* ── Responsive ── */
@media (max-width: 680px) {
  .nav-hamburger { display: flex; }
  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    border-top: 1px solid rgba(255,255,255,0.08);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 20px; border-bottom: 1px solid rgba(255,255,255,0.06); font-size: 0.95rem; }
  .nav-inner { flex-wrap: wrap; padding: 0 12px; }
  main { margin: 16px 10px; padding: 20px 16px; }
  .header-inner { padding: 12px 14px; }
  .header-inner .logo { height: 36px; }
  .header-inner h1 { font-size: 1rem; }
  .blog-grid { grid-template-columns: 1fr; }
  h2 { font-size: 1.15rem; }
}