/* ============================================================================
   BREASTKEEPERIN — Liquid Glass UI Library
   Brand: Stillberatung / Stillhilfe für junge Mütter (20–35)
   Mood: vertrauenswürdig · warm/wohlig · soft-premium · einfühlsam
   Style: Liquid Glass (translucent, blurred, iridescent highlights)
   ----------------------------------------------------------------------------
   Structure:
     1. Fonts
     2. Design Tokens (:root)
     3. Base & ambient background
     4. Typography
     5. Glass surface primitive
     6. Buttons
     7. Card
     8. Form field
     9. Badge / Pill / Chip
    10. Floating navbar
    11. Utilities & reduced-motion
   ========================================================================== */

/* 1. FONTS ----------------------------------------------------------------- */
@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700&family=Nunito+Sans:wght@400;500;600;700;800&display=swap');

/* 2. DESIGN TOKENS --------------------------------------------------------- */
:root {
  /* --- Brand: warm Rosé scale (NOT candy pink) --- */
  --bk-rose-50:  #FCEFEF;
  --bk-rose-100: #F9DEDF;
  --bk-rose-200: #F2C4C7;
  --bk-rose-300: #E9A4AA;
  --bk-rose-400: #DD848D;
  --bk-rose-500: #D26B77;   /* brand */
  --bk-rose-600: #BC5366;   /* primary fill (AA with #fff) */
  --bk-rose-700: #9E3F54;
  --bk-rose-800: #7E3144;   /* primary fill end */
  --bk-rose-900: #5E2433;

  /* --- Warm accent: Honig (cozy warmth) --- */
  --bk-honey-200: #F8E3C6;
  --bk-honey-300: #F1D0A2;
  --bk-honey-400: #E8B981;
  --bk-honey-500: #DCA15E;

  /* --- Calm accent: Sage (gentle authority / trust) --- */
  --bk-sage-200: #D7E3D6;
  --bk-sage-300: #BCD0BC;
  --bk-sage-500: #93B198;
  --bk-sage-700: #456049;

  /* --- Iridescent: Lavendel (glass sheen only) --- */
  --bk-lav-300: #D9C9F2;
  --bk-lav-400: #C4ACE9;

  /* --- Warm neutrals --- */
  --bk-milk:  #FCF7F2;      /* page base, warm not sterile */
  --bk-cream: #F5EADF;
  --bk-sand:  #ECDBCD;
  --bk-ink:        #3A272D; /* text, warm dark plum-brown */
  --bk-ink-soft:   #6F565E; /* muted text (AA on milk) */
  --bk-ink-faint:  #927A80; /* captions */
  --bk-line:       #E9D7CE; /* hairline borders on solids */

  /* --- Semantic --- */
  --bk-success: #6E9E78;
  --bk-warning: #D69B4A;
  --bk-danger:  #C8556A;

  /* --- Liquid glass surfaces --- */
  --glass-tint:        rgba(255, 252, 250, 0.55);
  --glass-tint-strong: rgba(255, 252, 250, 0.78);
  --glass-tint-rose:   rgba(232, 173, 181, 0.22);
  --glass-border:      rgba(255, 255, 255, 0.55);
  --glass-border-soft: rgba(255, 255, 255, 0.35);
  --glass-highlight:   rgba(255, 255, 255, 0.85);
  --glass-blur: 18px;
  --glass-blur-lg: 30px;

  /* --- Radius (soft, rounded = friendly) --- */
  --bk-r-sm: 12px;
  --bk-r-md: 18px;
  --bk-r-lg: 26px;
  --bk-r-xl: 34px;
  --bk-r-pill: 999px;

  /* --- Shadows (soft, warm-tinted) --- */
  --bk-shadow-sm:  0 2px 8px rgba(94, 36, 51, 0.06);
  --bk-shadow-md:  0 10px 30px rgba(94, 36, 51, 0.10);
  --bk-shadow-lg:  0 24px 60px rgba(94, 36, 51, 0.14);
  --bk-glow-rose:  0 12px 32px rgba(188, 83, 102, 0.32);

  /* --- Spacing --- */
  --bk-sp-1: 4px;  --bk-sp-2: 8px;  --bk-sp-3: 12px; --bk-sp-4: 16px;
  --bk-sp-5: 24px; --bk-sp-6: 32px; --bk-sp-7: 48px; --bk-sp-8: 64px;

  /* --- Type --- */
  --bk-font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
  --bk-font-body: 'Nunito Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;

  /* --- Motion --- */
  --bk-ease: cubic-bezier(0.22, 1, 0.36, 1);   /* gentle ease-out */
  --bk-ease-fluid: cubic-bezier(0.4, 0, 0.2, 1);
  --bk-dur: 240ms;
  --bk-dur-lg: 480ms;
}

/* 3. BASE & AMBIENT BACKGROUND -------------------------------------------- */
.bk-scope, body.bk-scope {
  font-family: var(--bk-font-body);
  color: var(--bk-ink);
  background: var(--bk-milk);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Soft liquid blobs behind content -> the "wohlig" liquid-glass mood */
.bk-ambient {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  background:
    radial-gradient(40% 50% at 12% 18%, rgba(232, 173, 181, 0.55), transparent 70%),
    radial-gradient(38% 44% at 88% 12%, rgba(241, 208, 162, 0.50), transparent 72%),
    radial-gradient(46% 52% at 78% 88%, rgba(196, 172, 233, 0.42), transparent 72%),
    radial-gradient(50% 50% at 28% 86%, rgba(188, 208, 188, 0.40), transparent 74%),
    var(--bk-milk);
}
.bk-ambient::after { /* faint grain for premium depth */
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.5;
  background-image: radial-gradient(rgba(94,36,51,0.04) 1px, transparent 1px);
  background-size: 4px 4px;
}

/* 4. TYPOGRAPHY ----------------------------------------------------------- */
.bk-display {
  font-family: var(--bk-font-display);
  font-weight: 600;
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--bk-ink);
}
.bk-h1 { font-family: var(--bk-font-display); font-weight: 600; font-size: clamp(2rem, 4vw, 3rem); line-height: 1.1; letter-spacing: -0.015em; }
.bk-h2 { font-family: var(--bk-font-display); font-weight: 600; font-size: clamp(1.5rem, 3vw, 2.1rem); line-height: 1.15; letter-spacing: -0.01em; }
.bk-h3 { font-family: var(--bk-font-display); font-weight: 500; font-size: 1.35rem; line-height: 1.25; }
.bk-lead {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  line-height: 1.6;
  color: var(--bk-ink-soft);
  max-width: 60ch;
}
.bk-body { font-size: 1rem; line-height: 1.7; color: var(--bk-ink-soft); max-width: 68ch; }
.bk-caption { font-size: 0.8rem; line-height: 1.5; color: var(--bk-ink-faint); letter-spacing: 0.02em; }
.bk-eyebrow {
  font-size: 0.78rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.14em; color: var(--bk-rose-600);
}

/* 4b. SANS VARIANT --------------------------------------------------------- */
/* Add class "bk-sans" on the scope element to swap the soft serif (Fraunces)
   for a rounded, soft-premium sans (Quicksand). Load Quicksand on the page.  */
.bk-sans { --bk-font-display: 'Quicksand', 'Nunito Sans', system-ui, -apple-system, sans-serif; }
.bk-sans .bk-display { font-weight: 700; letter-spacing: -0.012em; }
.bk-sans .bk-h1,
.bk-sans .bk-h2 { font-weight: 700; letter-spacing: -0.006em; }
.bk-sans .bk-h3 { font-weight: 600; }
.bk-sans .bk-nav__brand,
.bk-sans .bk-card__title { font-weight: 700; }

/* 5. GLASS SURFACE PRIMITIVE ---------------------------------------------- */
/* Core liquid-glass look reused by card / nav / pill / secondary button */
.bk-glass {
  position: relative;
  background: linear-gradient(135deg, var(--glass-tint-strong), var(--glass-tint));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  border: 1px solid var(--glass-border);
  border-radius: var(--bk-r-lg);
  box-shadow:
    var(--bk-shadow-md),
    inset 0 1px 0 var(--glass-highlight),          /* top specular line */
    inset 0 -16px 32px rgba(255, 255, 255, 0.18);  /* soft inner glow */
  isolation: isolate;
}
/* iridescent top-edge highlight */
.bk-glass::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(255,255,255,0.9), rgba(217,201,242,0.25) 40%, transparent 70%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  z-index: 1;
}
.bk-glass--rose { background: linear-gradient(135deg, var(--glass-tint-strong), var(--glass-tint-rose)); }
.bk-glass--lg { border-radius: var(--bk-r-xl); --glass-blur: var(--glass-blur-lg); }

/* 6. BUTTONS -------------------------------------------------------------- */
.bk-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55em;
  font-family: var(--bk-font-body);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1;
  padding: 0.95em 1.6em;
  min-height: 48px;            /* touch target */
  border: 0;
  border-radius: var(--bk-r-pill);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  isolation: isolate;
  overflow: hidden;
  transition: transform var(--bk-dur) var(--bk-ease),
              box-shadow var(--bk-dur) var(--bk-ease),
              filter var(--bk-dur) var(--bk-ease);
}
.bk-btn:focus-visible {
  outline: 3px solid var(--bk-rose-300);
  outline-offset: 3px;
}
.bk-btn :is(svg) { width: 1.15em; height: 1.15em; flex: none; }

/* sheen sweep shared by glass buttons */
.bk-btn::after {
  content: "";
  position: absolute;
  top: 0; left: -120%;
  width: 70%; height: 100%;
  background: linear-gradient(100deg, transparent, rgba(255,255,255,0.45), transparent);
  transform: skewX(-18deg);
  transition: left var(--bk-dur-lg) var(--bk-ease-fluid);
  z-index: 2;
  pointer-events: none;
}
.bk-btn:hover::after { left: 130%; }

/* --- Primary: liquid glass over warm rosé gradient --- */
.bk-btn--primary {
  color: #fff;
  text-shadow: 0 1px 2px rgba(94, 36, 51, 0.45);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.28), rgba(255,255,255,0) 42%),  /* gloss */
    linear-gradient(135deg, var(--bk-rose-600), var(--bk-rose-800));
  border: 1px solid rgba(255, 255, 255, 0.30);
  box-shadow:
    var(--bk-glow-rose),
    inset 0 1px 0 rgba(255, 255, 255, 0.6),
    inset 0 -2px 6px rgba(94, 36, 51, 0.35);
}
.bk-btn--primary:hover {
  transform: translateY(-2px);
  filter: saturate(108%) brightness(1.03);
  box-shadow:
    0 18px 42px rgba(188, 83, 102, 0.42),
    inset 0 1px 0 rgba(255, 255, 255, 0.7),
    inset 0 -2px 6px rgba(94, 36, 51, 0.35);
}
.bk-btn--primary:active { transform: translateY(0) scale(0.985); }

/* --- Secondary: true liquid glass (translucent) --- */
.bk-btn--secondary {
  color: var(--bk-rose-700);
  background:
    radial-gradient(130% 100% at 50% 0%, rgba(217, 201, 242, 0.32), transparent 62%), /* lavender sheen */
    linear-gradient(135deg, rgba(255, 255, 255, 0.58), rgba(255, 252, 250, 0.15));
  -webkit-backdrop-filter: blur(26px) saturate(200%);
  backdrop-filter: blur(26px) saturate(200%);
  border: 1px solid rgba(255, 255, 255, 0.65);
  box-shadow:
    0 10px 26px rgba(94, 36, 51, 0.14),
    inset 0 1px 0 rgba(255, 255, 255, 0.95),
    inset 0 -12px 22px rgba(255, 255, 255, 0.30),
    inset 0 0 0 1px rgba(255, 255, 255, 0.18);
}
.bk-btn--secondary:hover {
  transform: translateY(-2px);
  color: var(--bk-rose-800);
  box-shadow:
    0 16px 38px rgba(94, 36, 51, 0.18),
    inset 0 1px 0 rgba(255, 255, 255, 1),
    inset 0 -12px 24px rgba(255, 255, 255, 0.34),
    inset 0 0 0 1px rgba(255, 255, 255, 0.24);
}
.bk-btn--secondary:active { transform: translateY(0) scale(0.985); }

/* --- Ghost: minimal, for tertiary actions --- */
.bk-btn--ghost {
  color: var(--bk-rose-700);
  background: transparent;
  border: 1px solid transparent;
}
.bk-btn--ghost::after { display: none; }
.bk-btn--ghost:hover { background: var(--bk-rose-50); color: var(--bk-rose-800); }

/* --- Sizes --- */
.bk-btn--sm { font-size: 0.875rem; padding: 0.7em 1.15em; min-height: 40px; }
.bk-btn--lg { font-size: 1.1rem; padding: 1.05em 2em; min-height: 56px; }
.bk-btn--block { display: flex; width: 100%; }

/* --- States --- */
.bk-btn:disabled, .bk-btn[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.5;
  filter: grayscale(0.2);
  transform: none !important;
  box-shadow: none;
}
.bk-btn:disabled::after { display: none; }

.bk-btn--loading { color: transparent !important; text-shadow: none; pointer-events: none; }
.bk-btn--loading::before {
  content: "";
  position: absolute;
  width: 1.2em; height: 1.2em;
  border: 2.5px solid rgba(255,255,255,0.45);
  border-top-color: #fff;
  border-radius: 50%;
  animation: bk-spin 0.7s linear infinite;
  z-index: 3;
}
.bk-btn--secondary.bk-btn--loading::before { border-color: rgba(158,63,84,0.35); border-top-color: var(--bk-rose-700); }
@keyframes bk-spin { to { transform: rotate(360deg); } }

/* 7. CARD ----------------------------------------------------------------- */
.bk-card {
  position: relative;
  padding: var(--bk-sp-6);
  background: linear-gradient(135deg, var(--glass-tint-strong), var(--glass-tint));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  border: 1px solid var(--glass-border);
  border-radius: var(--bk-r-lg);
  box-shadow: var(--bk-shadow-md), inset 0 1px 0 var(--glass-highlight);
  transition: transform var(--bk-dur) var(--bk-ease), box-shadow var(--bk-dur) var(--bk-ease);
}
.bk-card--hover:hover { transform: translateY(-4px); box-shadow: var(--bk-shadow-lg), inset 0 1px 0 var(--glass-highlight); }
.bk-card__title { font-family: var(--bk-font-display); font-weight: 600; font-size: 1.25rem; margin: 0 0 0.4em; color: var(--bk-ink); }
.bk-card__text { color: var(--bk-ink-soft); line-height: 1.65; margin: 0; }

/* 8. FORM FIELD ----------------------------------------------------------- */
.bk-field { display: flex; flex-direction: column; gap: 0.45em; }
.bk-field__label { font-weight: 700; font-size: 0.9rem; color: var(--bk-ink); }
.bk-input {
  font-family: var(--bk-font-body);
  font-size: 1rem;
  color: var(--bk-ink);
  padding: 0.85em 1.1em;
  min-height: 48px;
  background: rgba(255, 255, 255, 0.6);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--bk-line);
  border-radius: var(--bk-r-md);
  box-shadow: inset 0 2px 5px rgba(94, 36, 51, 0.05);
  transition: border-color var(--bk-dur) var(--bk-ease), box-shadow var(--bk-dur) var(--bk-ease);
  width: 100%;
}
.bk-input::placeholder { color: var(--bk-ink-faint); }
.bk-input:focus {
  outline: none;
  border-color: var(--bk-rose-400);
  box-shadow: 0 0 0 4px rgba(221, 132, 141, 0.22), inset 0 2px 5px rgba(94, 36, 51, 0.04);
}
.bk-field__hint { font-size: 0.8rem; color: var(--bk-ink-faint); }

/* 9. BADGE / PILL / CHIP -------------------------------------------------- */
.bk-badge {
  display: inline-flex; align-items: center; gap: 0.45em;
  font-size: 0.78rem; font-weight: 700; line-height: 1;
  padding: 0.55em 0.95em;
  border-radius: var(--bk-r-pill);
  color: var(--bk-rose-800);
  background-color: var(--bk-rose-100);
  background-image: linear-gradient(160deg, rgba(255, 255, 255, 0.55), rgba(255, 255, 255, 0) 58%);
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow:
    0 4px 10px rgba(94, 36, 51, 0.12),
    inset 0 1px 0 rgba(255, 255, 255, 0.85),
    inset 0 -2px 5px rgba(94, 36, 51, 0.08);
}
.bk-badge--honey { background-color: var(--bk-honey-200); color: #7c4f17; }
.bk-badge--sage  { background-color: var(--bk-sage-200); color: var(--bk-sage-700); }
.bk-badge--glass {
  color: var(--bk-ink);
  background-color: transparent;
  background-image: linear-gradient(135deg, var(--glass-tint-strong), var(--glass-tint));
  -webkit-backdrop-filter: blur(16px) saturate(190%);
  backdrop-filter: blur(16px) saturate(190%);
  border: 1px solid var(--glass-border);
  box-shadow:
    0 6px 14px rgba(94, 36, 51, 0.12),
    inset 0 1px 0 var(--glass-highlight),
    inset 0 -3px 8px rgba(255, 255, 255, 0.25);
}
.bk-badge__dot { width: 0.5em; height: 0.5em; border-radius: 50%; background: currentColor; box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.35); }

/* 10. FLOATING NAVBAR ----------------------------------------------------- */
.bk-nav {
  position: sticky;
  top: 12px;
  z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: var(--bk-sp-5);
  padding: 0.7em 0.7em 0.7em 1.4em;
  border-radius: var(--bk-r-pill);
  background: transparent;
  border: 1px solid transparent;
  box-shadow: none;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  transition: background var(--bk-dur-lg) var(--bk-ease),
              border-color var(--bk-dur-lg) var(--bk-ease),
              box-shadow var(--bk-dur-lg) var(--bk-ease),
              -webkit-backdrop-filter var(--bk-dur-lg) var(--bk-ease),
              backdrop-filter var(--bk-dur-lg) var(--bk-ease),
              transform var(--bk-dur-lg) var(--bk-ease);
}
/* embedded in hero -> floats out as a glass pill on scroll */
.bk-nav.is-floating {
  background: linear-gradient(135deg, var(--glass-tint-strong), var(--glass-tint));
  -webkit-backdrop-filter: blur(var(--glass-blur-lg)) saturate(180%);
  backdrop-filter: blur(var(--glass-blur-lg)) saturate(180%);
  border: 1px solid var(--glass-border);
  box-shadow: var(--bk-shadow-lg), inset 0 1px 0 var(--glass-highlight);
}
.bk-nav__brand { font-family: var(--bk-font-display); font-weight: 600; font-size: 1.2rem; color: var(--bk-ink); }
.bk-nav__links { display: flex; align-items: center; gap: var(--bk-sp-5); }
.bk-nav__link {
  font-weight: 600; font-size: 0.95rem; color: var(--bk-ink-soft); text-decoration: none;
  transition: color var(--bk-dur) var(--bk-ease);
}
.bk-nav__link:hover { color: var(--bk-rose-700); }
/* CTA hidden until scrolled past the hero, then slides in */
.bk-nav__cta {
  max-width: 0;
  padding-left: 0;
  padding-right: 0;
  opacity: 0;
  transform: scale(0.9);
  overflow: hidden;
  pointer-events: none;
  transition: max-width var(--bk-dur-lg) var(--bk-ease),
              padding var(--bk-dur-lg) var(--bk-ease),
              opacity var(--bk-dur) var(--bk-ease),
              transform var(--bk-dur) var(--bk-ease);
}
.bk-nav.show-cta .bk-nav__cta {
  max-width: 240px;
  padding-left: 1.15em;
  padding-right: 1.15em;
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

/* 11. UTILITIES & REDUCED MOTION ------------------------------------------ */
.bk-stack { display: flex; flex-direction: column; }
.bk-row { display: flex; align-items: center; flex-wrap: wrap; gap: var(--bk-sp-4); }
.bk-container { width: 100%; max-width: 1100px; margin-inline: auto; padding-inline: var(--bk-sp-5); }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .bk-btn::after { display: none; }
}