/* ═══════════════════════════════════════════════════════════════════════════
   VERUM — Design System 12: The Curated Diagnostic
   Source of truth: Stitch "Verum Clinical Atelier" (assets/5ee48a1d464e4559805a2b64849bb795)
   Warm Teal · No-Line rule · Tonal layering · Dual typography
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Tokens ─────────────────────────────────────────────────────────────── */
:root {
  /* Primary — Warm Teal */
  --v-primary:                #00585e;
  --v-primary-container:      #00727a;
  --v-on-primary:             #ffffff;
  --v-on-primary-container:   #9ff4fc;
  --v-primary-fixed:          #9cf0f9;
  --v-primary-fixed-dim:      #7fd4dc;
  --v-on-primary-fixed:       #002022;
  --v-on-primary-fixed-var:   #004f55;
  --v-inverse-primary:        #7fd4dc;

  /* Secondary — Silver Ash */
  --v-secondary:              #515f74;
  --v-secondary-container:    #d5e3fd;
  --v-on-secondary:           #ffffff;
  --v-on-secondary-container: #57657b;

  /* Tertiary */
  --v-tertiary:               #415062;
  --v-tertiary-container:     #59687b;
  --v-on-tertiary:            #ffffff;
  --v-on-tertiary-container:  #d8e7fe;

  /* Surface hierarchy — tonal layering, NEVER 1px borders for structure */
  --v-surface:                #f6fafe;   /* base — page background */
  --v-surface-low:            #f0f4f8;   /* surface_container_low */
  --v-surface-mid:            #eaeef2;   /* surface_container */
  --v-surface-high:           #e4e9ed;   /* surface_container_high */
  --v-surface-highest:        #dfe3e7;   /* surface_container_highest */
  --v-surface-white:          #ffffff;   /* surface_container_lowest — lifted cards */
  --v-surface-dim:            #d6dade;   /* pressed/dimmed state */

  /* Text */
  --v-on-surface:             #171c1f;
  --v-on-surface-variant:     #3e494a;
  --v-muted:                  #6e797a;   /* outline token */

  /* Structural — ghost border ONLY when accessibility requires it */
  --v-outline-variant:        #bec9ca;
  --v-outline:                rgba(190, 201, 202, 0.15);  /* outline_variant at 15% */
  --v-outline-focus:          #00585e;

  /* Error */
  --v-error:                  #ba1a1a;
  --v-error-container:        #ffdad6;

  /* Shadows — ambient only, never heavy */
  --v-shadow-card:  0 0 32px 0 rgba(23, 28, 31, 0.06);
  --v-shadow-modal: 0 0 48px 0 rgba(23, 28, 31, 0.06);
  --v-shadow-fab:   0 4px 16px rgba(0, 88, 94, 0.32);
  --v-shadow-nav-top:    0 8px 32px rgba(23, 28, 31, 0.06);
  --v-shadow-nav-bottom: 0 -8px 32px rgba(23, 28, 31, 0.06);

  /* Typography */
  --v-font-serif: 'Noto Serif', Georgia, serif;
  --v-font-sans:  'Manrope', 'Inter', system-ui, sans-serif;

  /* Spacing scale */
  --v-space-1:  0.25rem;
  --v-space-2:  0.5rem;
  --v-space-3:  0.75rem;
  --v-space-4:  1rem;
  --v-space-5:  1.25rem;
  --v-space-6:  1.5rem;
  --v-space-8:  2rem;
  --v-space-10: 2.5rem;
  --v-space-12: 3rem;
  --v-space-16: 4rem;

  /* Radius — ROUND_FOUR base */
  --v-radius-sm:   0.125rem;
  --v-radius:      0.25rem;   /* DEFAULT — buttons, cards */
  --v-radius-lg:   0.5rem;    /* large cards, modals */
  --v-radius-full: 9999px;    /* chips, pills */

  /* Transitions */
  --v-ease: 0.15s ease;
}

/* ── Reset ──────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  height: 100%;
}
body {
  font-family: var(--v-font-sans);
  background: var(--v-surface);
  color: var(--v-on-surface);
  line-height: 1.6;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
button { cursor: pointer; font-family: inherit; }

/* ── Typography ─────────────────────────────────────────────────────────── */

/* VERUM wordmark — Noto Serif, all-caps, 0.15em tracking per DS12 */
.v-wordmark {
  font-family: var(--v-font-serif);
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--v-primary);
  text-decoration: none;
}

/* Serif — brand moments, section headlines only */
.v-display {
  font-family: var(--v-font-serif);
  font-weight: 600;
  line-height: 1.15;
  color: var(--v-on-surface);
}
.v-display-lg { font-size: clamp(2rem,   6vw, 3.5rem); }
.v-display-md { font-size: clamp(1.5rem, 4vw, 2.5rem); }
.v-display-sm { font-size: clamp(1.25rem,3vw, 1.75rem); }

/* Sans — everything functional */
.v-title-lg { font-size: 1.25rem;   font-weight: 700; line-height: 1.3;  }
.v-title-md { font-size: 1.125rem;  font-weight: 600; line-height: 1.4;  }
.v-title-sm { font-size: 1rem;      font-weight: 600; line-height: 1.4;  }
.v-body-lg  { font-size: 1rem;      font-weight: 400; line-height: 1.65; }
.v-body-md  { font-size: 0.9375rem; font-weight: 400; line-height: 1.6;  }
.v-body-sm  { font-size: 0.875rem;  font-weight: 400; line-height: 1.55; }

/* Label — Manrope, uppercase, tracked: categories, metadata */
.v-label {
  font-family: var(--v-font-sans);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--v-primary);
}

/* ── Layout helpers ─────────────────────────────────────────────────────── */
.v-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--v-space-6);
}
.v-container-narrow {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 var(--v-space-6);
}
@media (max-width: 640px) {
  .v-container,
  .v-container-narrow { padding: 0 var(--v-space-4); }
}

/* ── Surface layers — tonal, no borders ────────────────────────────────── */
.v-surface         { background: var(--v-surface); }
.v-surface-low     { background: var(--v-surface-low); }
.v-surface-mid     { background: var(--v-surface-mid); }
.v-surface-white   { background: var(--v-surface-white); }

/* ── Cards — no borders, tonal lift via background ─────────────────────── */
.v-card {
  background: var(--v-surface-white);
  border-radius: var(--v-radius-lg);
  padding: var(--v-space-8);
  box-shadow: var(--v-shadow-card);
}
.v-card-sm {
  background: var(--v-surface-white);
  border-radius: var(--v-radius-lg);
  padding: var(--v-space-6);
  box-shadow: var(--v-shadow-card);
}

/* VERUM Intelligence card — dark teal editorial card */
.v-insight {
  background: var(--v-primary-container);
  border-radius: var(--v-radius-lg);
  padding: var(--v-space-6);
  color: var(--v-on-primary-container);
}
.v-insight-title {
  font-family: var(--v-font-serif);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--v-on-primary-container);
  margin-bottom: var(--v-space-2);
}
.v-insight .v-muted  { color: rgba(159, 244, 252, 0.65); }
.v-insight .v-label  { color: rgba(159, 244, 252, 0.70); }

/* ── Buttons ────────────────────────────────────────────────────────────── */
.v-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--v-space-2);
  border: none;
  border-radius: var(--v-radius);   /* DEFAULT = 0.25rem per ROUND_FOUR */
  font-family: var(--v-font-sans);
  font-weight: 600;
  text-decoration: none;
  transition: opacity var(--v-ease);
  white-space: nowrap;
}
.v-btn:hover    { opacity: 0.88; }
.v-btn:disabled { opacity: 0.4; cursor: default; }

/* Primary — gradient primary → primary_container at 135deg (Stitch CTA texture rule) */
.v-btn-primary {
  background: linear-gradient(135deg, var(--v-primary), var(--v-primary-container));
  color: var(--v-on-primary);
  padding: var(--v-space-3) var(--v-space-6);
  font-size: 0.9375rem;
}
.v-btn-primary-lg {
  padding: var(--v-space-4) var(--v-space-8);
  font-size: 1rem;
}

/* Secondary — surface-container-high bg, primary text */
.v-btn-secondary {
  background: var(--v-surface-high);
  color: var(--v-primary);
  padding: var(--v-space-3) var(--v-space-6);
  font-size: 0.9375rem;
}

/* Tertiary — text-only, 2px underline in primary_container on hover */
.v-btn-tertiary {
  background: none;
  color: var(--v-primary);
  padding: var(--v-space-2) var(--v-space-3);
  font-size: 0.875rem;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  transition: border-color var(--v-ease);
}
.v-btn-tertiary:hover { border-bottom-color: var(--v-primary-container); }

/* ── Input fields — editorial precision ────────────────────────────────── */
.v-input {
  width: 100%;
  background: var(--v-surface-low);
  border: none;
  border-bottom: 1px solid var(--v-outline);   /* ghost border at rest */
  border-radius: var(--v-radius-sm) var(--v-radius-sm) 0 0;
  padding: var(--v-space-3) var(--v-space-4);
  font-family: var(--v-font-sans);
  font-size: 1rem;
  color: var(--v-on-surface);
  outline: none;
  transition: border-color var(--v-ease);
}
.v-input:focus        { border-bottom: 2px solid var(--v-outline-focus); }
.v-input::placeholder { color: var(--v-muted); }

/* ── Chips — pill shape (ROUND_FULL), secondary_container ───────────────── */
.v-chip {
  display: inline-flex;
  align-items: center;
  padding: var(--v-space-1) var(--v-space-3);
  background: var(--v-secondary-container);
  color: var(--v-on-secondary-container);
  border-radius: var(--v-radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  border: none;
  white-space: nowrap;
  cursor: default;
}
.v-chip-primary {
  background: var(--v-primary);
  color: var(--v-on-primary);
}
.v-chip-teal {
  background: color-mix(in srgb, var(--v-primary) 12%, white);
  color: var(--v-primary);
}
.v-chip-interactive {
  cursor: pointer;
  transition: opacity var(--v-ease);
}
.v-chip-interactive:hover { opacity: 0.8; }

/* ── Glassmorphism — nav bars, floating panels (Stitch: 80% opacity, 20px blur) */
.v-glass {
  background: rgba(246, 250, 254, 0.80);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

/* ── Top navigation (desktop) ───────────────────────────────────────────── */
#v-topnav {
  position: sticky;
  top: 0;
  z-index: 200;
  box-shadow: var(--v-shadow-nav-top);
}
.v-topnav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3.5rem;
}
.v-topnav-links {
  display: flex;
  align-items: center;
  gap: var(--v-space-8);
}
.v-topnav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--v-muted);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 2px solid transparent;
  transition: color var(--v-ease), border-color var(--v-ease);
}
.v-topnav-links a:hover { color: var(--v-primary); }
.v-topnav-links a.active {
  color: var(--v-primary);
  border-bottom-color: var(--v-primary);
}

@media (max-width: 768px) {
  .v-topnav-links,
  .v-topnav-cta { display: none; }
}

/* ── Bottom tab bar (mobile) — rounded top per DS12 ────────────────────── */
#v-bottomnav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 200;
  display: none;
  border-radius: var(--v-radius-lg) var(--v-radius-lg) 0 0;
  box-shadow: var(--v-shadow-nav-bottom);
  padding-bottom: env(safe-area-inset-bottom);
  overflow: hidden;
}
@media (max-width: 768px) { #v-bottomnav { display: flex; } }

.v-bottomnav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--v-space-2) var(--v-space-1);
  color: var(--v-on-surface-variant);
  text-decoration: none;
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  transition: color var(--v-ease);
  border: none;
  background: none;
}
.v-bottomnav-item:hover,
.v-bottomnav-item.active { color: var(--v-primary); }

/* ── V button — floating AI assistant trigger ───────────────────────────── */
#v-fab {
  position: fixed;
  z-index: 300;
  bottom: calc(4.5rem + env(safe-area-inset-bottom));
  right: var(--v-space-6);
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--v-primary), var(--v-primary-container));
  color: var(--v-on-primary);
  border: none;
  font-family: var(--v-font-serif);
  font-weight: 700;
  font-size: 1.375rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--v-shadow-fab);
  transition: transform var(--v-ease), box-shadow var(--v-ease);
}
#v-fab:hover {
  transform: scale(1.06);
  box-shadow: 0 6px 24px rgba(0, 88, 94, 0.42);
}
@media (min-width: 769px) {
  #v-fab { bottom: var(--v-space-8); }
}

/* ── Page body padding — clears bottom nav on mobile ───────────────────── */
.v-page {
  padding-bottom: calc(5rem + env(safe-area-inset-bottom));
}
@media (min-width: 769px) { .v-page { padding-bottom: var(--v-space-16); } }

/* ── Utility ────────────────────────────────────────────────────────────── */
.v-teal        { color: var(--v-primary); }
.v-muted       { color: var(--v-muted); }
.v-serif       { font-family: var(--v-font-serif); }
.v-divider     { border: none; border-top: 1px solid var(--v-outline); margin: var(--v-space-6) 0; }
.v-stack       { display: flex; flex-direction: column; }
.v-row         { display: flex; align-items: center; }
.v-gap-2       { gap: var(--v-space-2); }
.v-gap-3       { gap: var(--v-space-3); }
.v-gap-4       { gap: var(--v-space-4); }
.v-gap-6       { gap: var(--v-space-6); }
.v-wrap        { flex-wrap: wrap; }
.sr-only       { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }