/* ============================================================
   CifraHQ Brand Kit — Page-Specific Styles
   World-class brand guidelines experience
   ============================================================ */

/* ── Component-Specific Custom Properties ─────────────────── */
:root {
  --bk-hero-height: 100vh;
  --bk-nav-height: 56px;
  --bk-card-radius: 16px;
  --bk-card-shadow: 0 4px 24px rgba(8, 61, 127, 0.10);
  --bk-card-shadow-hover: 0 20px 60px rgba(8, 61, 127, 0.20);
  --bk-transition: 220ms cubic-bezier(0.4, 0, 0.2, 1);
  --bk-transition-slow: 380ms cubic-bezier(0.4, 0, 0.2, 1);
  --bk-checker-size: 18px;
  --bk-checker-light: #f0f0f0;
  --bk-checker-dark: #c8c8c8;
  --bk-surface: #ffffff;
  --bk-surface-alt: #f8fafc;
  --bk-border: rgba(8, 61, 127, 0.10);
  --bk-text-primary: #1a1a2e;
  --bk-text-muted: #6b7280;
  --bk-section-gap: 120px;
  --bk-blue: #083D7F;
  --bk-orange: #E8963F;
  --bk-grey: #939598;
}

[data-theme="dark"] {
  --bk-surface: #1a1a2e;
  --bk-surface-alt: #16213e;
  --bk-border: rgba(74, 159, 229, 0.15);
  --bk-text-primary: #e8eaf0;
  --bk-text-muted: #9ca3af;
  --bk-card-shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
  --bk-card-shadow-hover: 0 20px 60px rgba(0, 0, 0, 0.55);
  --bk-checker-light: #2a2a3e;
  --bk-checker-dark: #1e1e30;
}

/* ── Body & Page Setup ───────────────────────────────────────── */
.bk-page {
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Inter', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  color: var(--bk-text-primary);
  background: var(--bk-surface-alt);
}

/* ── ① Hero Section ──────────────────────────────────── */
.bk-hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  background: linear-gradient(140deg, #011c3a 0%, #063369 50%, #083D7F 100%);
}

/* Precision grid overlay */
.bk-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
  z-index: 0;
}

/* Ambient glow */
.bk-hero::after {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 65vw;
  height: 140%;
  background: radial-gradient(ellipse at 65% 45%,
    rgba(232,150,63,0.12) 0%,
    rgba(74,159,229,0.09) 35%,
    transparent 65%);
  pointer-events: none;
  z-index: 0;
  animation: bk-glow-breathe 9s ease-in-out infinite alternate;
}

@keyframes bk-glow-breathe {
  from { opacity: 0.7; transform: scale(1); }
  to   { opacity: 1;   transform: scale(1.1); }
}

/* ── Inner two-column grid ───────────────────────────── */
.bk-hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 5fr 7fr;
  align-items: center;
  min-height: 100vh;
  max-width: 1440px;
  width: 100%;
  margin: 0 auto;
  padding: 7rem 3.5rem 5rem 5rem;
  gap: 4rem;
}

/* ── Left column ───────────────────────────────────── */
.bk-hero-left {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

/* Editorial eyebrow */
.bk-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 2rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
}

.bk-eyebrow-rule {
  display: block;
  width: 28px;
  height: 1px;
  background: var(--bk-orange);
  flex-shrink: 0;
}

.bk-eyebrow-dot {
  display: block;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: rgba(255,255,255,0.25);
  flex-shrink: 0;
}

.bk-eyebrow-year {
  color: var(--bk-orange);
}

/* Hero logo: official dark PNG — styled as a premium floating card */
.bk-hero-logo {
  max-width: 460px;
  width: 100%;
  height: auto;
  margin-bottom: 1.75rem;
  border-radius: 14px;
  box-shadow:
    0 12px 40px rgba(0,0,0,0.4),
    0 0 0 1px rgba(255,255,255,0.10),
    inset 0 1px 0 rgba(255,255,255,0.12);
}

/* Headline */
.bk-hero-title {
  font-size: clamp(1.8rem, 3vw, 2.9rem);
  font-weight: 300;
  color: rgba(255,255,255,0.82);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 1.5rem;
}

.bk-hero-title strong {
  display: block;
  font-size: clamp(2.4rem, 4.2vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  background: linear-gradient(95deg, #E8963F 0%, #ffba72 55%, #E8963F 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: bk-shine 5s linear infinite;
}

@keyframes bk-shine {
  to { background-position: 200% center; }
}

/* Subtitle */
.bk-hero-subtitle {
  font-size: clamp(0.9rem, 1.4vw, 1.05rem);
  color: rgba(255,255,255,0.58);
  max-width: 440px;
  margin: 0 0 2.5rem;
  line-height: 1.8;
}

/* Stats row */
.bk-hero-stats {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.bk-stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.bk-stat-num {
  font-size: 1.6rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
  letter-spacing: -0.02em;
}

.bk-stat-label {
  font-size: 0.68rem;
  color: rgba(255,255,255,0.45);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.bk-stat-sep {
  width: 1px;
  height: 2.25rem;
  background: rgba(255,255,255,0.14);
  flex-shrink: 0;
}

/* ── Right column: Product showcase ──────────────────── */
.bk-hero-right {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem 0;
}

/* Browser-framed app window with perspective tilt */
.bk-app-showcase {
  position: relative;
  width: 100%;
  max-width: 660px;
  border-radius: 12px;
  overflow: hidden;
  background: #1d2129;
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.07),
    -20px 20px 80px rgba(0,0,0,0.55),
    20px 0 60px rgba(8,61,127,0.25);
  transform: perspective(1400px) rotateY(-7deg) rotateX(2deg);
  transform-origin: center center;
  transition: transform 0.6s cubic-bezier(0.34,1.56,0.64,1);
  animation: bk-showcase-in 0.9s 0.15s ease both;
}

.bk-app-showcase:hover {
  transform: perspective(1400px) rotateY(-2deg) rotateX(0.5deg);
}

@keyframes bk-showcase-in {
  from {
    opacity: 0;
    transform: perspective(1400px) rotateY(-16deg) rotateX(4deg) translateY(24px);
  }
  to {
    opacity: 1;
    transform: perspective(1400px) rotateY(-7deg) rotateX(2deg) translateY(0);
  }
}

/* Browser chrome bar */
.bk-app-chrome {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.55rem 1rem;
  background: #282c35;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.bk-chrome-dots {
  display: flex;
  gap: 0.38rem;
  flex-shrink: 0;
}

.bk-chrome-dot {
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.bk-chrome-bar {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255,255,255,0.06);
  border-radius: 5px;
  padding: 0.22rem 0.7rem;
  font-size: 0.65rem;
  color: rgba(255,255,255,0.35);
  font-family: 'SF Mono','Fira Code','Consolas',monospace;
  max-width: 200px;
  letter-spacing: 0.01em;
}

.bk-chrome-bar .fa-lock {
  font-size: 0.55rem;
  opacity: 0.6;
}

/* Screenshot */
.bk-app-screen-wrap {
  display: block;
  line-height: 0;
  overflow: hidden;
  min-height: 380px;
  background: linear-gradient(160deg, #f0f4f8 0%, #e8edf5 100%);
  position: relative;
}

/* Grid-like placeholder lines while image loads */
.bk-app-screen-wrap::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(8,61,127,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(8,61,127,0.06) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

.bk-app-screen {
  display: block;
  width: 100%;
  height: auto;
  position: relative;
  z-index: 1;
}

/* ── Floating metric cards ─────────────────────────────── */
.bk-float-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(16px);
  border-radius: 12px;
  padding: 0.8rem 1.1rem;
  box-shadow: 0 8px 30px rgba(0,0,0,0.22), 0 0 0 1px rgba(255,255,255,0.15);
  z-index: 5;
  pointer-events: none;
}

.bk-float-card--revenue {
  bottom: 11%;
  left: -2.25rem;
  animation: bk-float-a 4.2s ease-in-out infinite;
}

.bk-float-card--cash {
  top: 17%;
  right: -1.5rem;
  animation: bk-float-b 5.1s ease-in-out infinite;
}

@keyframes bk-float-a {
  0%, 100% { transform: translateY(0) rotate(-1.5deg); }
  50%       { transform: translateY(-10px) rotate(-1.5deg); }
}

@keyframes bk-float-b {
  0%, 100% { transform: translateY(0) rotate(1.5deg); }
  50%       { transform: translateY(-9px) rotate(1.5deg); }
}

.bk-float-icon {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  color: #fff;
  flex-shrink: 0;
}

.bk-float-icon--green { background: linear-gradient(135deg,#10b981,#059669); }
.bk-float-icon--blue  { background: linear-gradient(135deg,#3b82f6,#2563eb); }

.bk-float-num {
  font-size: 1rem;
  font-weight: 700;
  color: #111;
  line-height: 1.2;
  white-space: nowrap;
}

.bk-float-lbl {
  font-size: 0.66rem;
  color: #6b7280;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

/* ── Scroll hint ───────────────────────────────────── */
.bk-hero-scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  color: rgba(255,255,255,0.35);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  animation: bk-bounce 2.5s ease-in-out infinite;
}

@keyframes bk-bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 1100px) {
  .bk-hero-inner {
    grid-template-columns: 1fr 1fr;
    padding: 7rem 2.5rem 5rem;
    gap: 3rem;
  }
}

@media (max-width: 900px) {
  .bk-hero-inner {
    grid-template-columns: 1fr;
    padding: 7rem 1.5rem 5rem;
    gap: 2.5rem;
  }
  .bk-hero-left { align-items: center; text-align: center; }
  .bk-hero-subtitle { margin-left: auto; margin-right: auto; }
  .bk-hero-stats { justify-content: center; }
  .bk-app-showcase {
    transform: perspective(1400px) rotateY(0) rotateX(2deg);
    max-width: 100%;
  }
  .bk-float-card--revenue { left: 0; }
  .bk-float-card--cash    { right: 0; }
}

@media (max-width: 576px) {
  .bk-hero-inner { padding: 6rem 1.25rem 4rem; }
  .bk-hero-logo  { max-width: 280px; }
  .bk-float-card { display: none; }
}

/* ── ② Sticky Section Nav ────────────────────────────────────── */
.bk-section-nav {
  position: sticky;
  top: 76px; /* below main navbar */
  z-index: 900;
  padding: 0.75rem 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--bk-border);
  transition: box-shadow var(--bk-transition);
}

[data-theme="dark"] .bk-section-nav {
  background: rgba(26, 26, 46, 0.95);
}

.bk-section-nav.is-stuck {
  box-shadow: 0 4px 24px rgba(8, 61, 127, 0.10);
}

.bk-nav-list {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  list-style: none;
  margin: 0;
  padding: 0 1rem;
  overflow-x: auto;
  scrollbar-width: none;
  justify-content: center;
  flex-wrap: wrap;
}

.bk-nav-list::-webkit-scrollbar { display: none; }

.bk-nav-pill {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 1.1rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--bk-text-muted);
  text-decoration: none;
  transition: all var(--bk-transition);
  white-space: nowrap;
  border: 1px solid transparent;
  cursor: pointer;
}

.bk-nav-pill:hover {
  color: var(--bk-blue);
  background: rgba(8, 61, 127, 0.06);
  border-color: rgba(8, 61, 127, 0.12);
}

.bk-nav-pill.active {
  background: var(--bk-blue);
  color: #fff;
  border-color: var(--bk-blue);
  box-shadow: 0 4px 14px rgba(8, 61, 127, 0.30);
}

[data-theme="dark"] .bk-nav-pill.active {
  background: #4A9FE5;
  border-color: #4A9FE5;
  box-shadow: 0 4px 14px rgba(74, 159, 229, 0.30);
}

[data-theme="dark"] .bk-nav-pill:hover {
  color: #4A9FE5;
  background: rgba(74, 159, 229, 0.08);
}

/* ── ③ Sections Layout ──────────────────────────────────────── */
.bk-section {
  padding: var(--bk-section-gap) 0;
  scroll-margin-top: calc(76px + var(--bk-nav-height) + 16px);
}

.bk-section:nth-child(even) {
  background: var(--bk-surface);
}

.bk-section-header {
  margin-bottom: 3.5rem;
}

.bk-section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--bk-orange);
  margin-bottom: 0.75rem;
}

.bk-section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--bk-text-primary);
  margin-bottom: 1rem;
}

.bk-section-desc {
  font-size: 1.1rem;
  color: var(--bk-text-muted);
  max-width: 680px;
  line-height: 1.75;
}

/* ── ④ Control Bar (Toggles) ─────────────────────────────────── */
.bk-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
  padding: 1rem 1.25rem;
  background: var(--bk-surface);
  border-radius: 14px;
  border: 1px solid var(--bk-border);
}

.bk-controls-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--bk-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-right: 0.25rem;
}

.bk-toggle-group {
  display: flex;
  background: var(--bk-surface-alt);
  border-radius: 10px;
  padding: 3px;
  gap: 2px;
  border: 1px solid var(--bk-border);
}

.bk-toggle-btn {
  padding: 0.38rem 1rem;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--bk-text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all var(--bk-transition);
}

.bk-toggle-btn.active {
  background: var(--bk-surface);
  color: var(--bk-blue);
  box-shadow: 0 1px 6px rgba(8, 61, 127, 0.12);
}

[data-theme="dark"] .bk-toggle-btn.active {
  color: #4A9FE5;
  background: #1a1a2e;
}

.bk-btn-download-all {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.25rem;
  border-radius: 10px;
  font-size: 0.875rem;
  font-weight: 600;
  color: #fff;
  background: var(--bk-blue);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--bk-transition);
}

.bk-btn-download-all:hover {
  background: #063D6E;
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(8, 61, 127, 0.28);
}

/* ── ⑤ Logo Cards Grid ─────────────────────────────────────── */
.bk-logo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.bk-logo-card {
  background: var(--bk-surface);
  border-radius: var(--bk-card-radius);
  border: 1px solid var(--bk-border);
  overflow: hidden;
  transition: all var(--bk-transition-slow);
  box-shadow: var(--bk-card-shadow);
}

.bk-logo-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--bk-card-shadow-hover);
  border-color: rgba(8, 61, 127, 0.2);
}

.bk-logo-preview {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  padding: 2.5rem;
  border-radius: var(--bk-card-radius) var(--bk-card-radius) 0 0;
  transition: background var(--bk-transition);
  position: relative;
}

/* Background variants */
.bk-logo-preview.bg-light  { background: #ffffff; }
.bk-logo-preview.bg-dark   { background: #083D7F; }
.bk-logo-preview.bg-transparent {
  background-image:
    linear-gradient(45deg, var(--bk-checker-dark) 25%, transparent 25%),
    linear-gradient(-45deg, var(--bk-checker-dark) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--bk-checker-dark) 75%),
    linear-gradient(-45deg, transparent 75%, var(--bk-checker-dark) 75%);
  background-size: var(--bk-checker-size) var(--bk-checker-size);
  background-position:
    0 0,
    0 calc(var(--bk-checker-size) / 2),
    calc(var(--bk-checker-size) / 2) calc(-1 * var(--bk-checker-size) / 2),
    calc(-1 * var(--bk-checker-size) / 2) 0;
  background-color: var(--bk-checker-light);
}

.bk-logo-preview img {
  max-width: 200px;
  max-height: 100px;
  object-fit: contain;
  transition: transform var(--bk-transition);
}

.bk-logo-card:hover .bk-logo-preview img {
  transform: scale(1.04);
}

.bk-logo-card-body {
  padding: 1.25rem 1.5rem;
  border-top: 1px solid var(--bk-border);
}

.bk-logo-card-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--bk-text-primary);
  margin-bottom: 0.25rem;
}

.bk-logo-card-meta {
  font-size: 0.8rem;
  color: var(--bk-text-muted);
  margin-bottom: 1rem;
}

/* Download dropdown */
.bk-download-wrap {
  position: relative;
}

.bk-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 1rem;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--bk-blue);
  background: rgba(8, 61, 127, 0.06);
  border: 1px solid rgba(8, 61, 127, 0.15);
  cursor: pointer;
  transition: all var(--bk-transition);
  width: 100%;
  justify-content: center;
}

.bk-download-btn:hover {
  background: var(--bk-blue);
  color: #fff;
  border-color: var(--bk-blue);
}

[data-theme="dark"] .bk-download-btn {
  color: #4A9FE5;
  background: rgba(74, 159, 229, 0.08);
  border-color: rgba(74, 159, 229, 0.2);
}

[data-theme="dark"] .bk-download-btn:hover {
  background: #4A9FE5;
  color: #fff;
}

.bk-dropdown-menu {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--bk-surface);
  border: 1px solid var(--bk-border);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
  overflow: hidden;
  opacity: 0;
  transform: translateY(6px);
  pointer-events: none;
  transition: all 180ms ease;
  z-index: 100;
}

.bk-dropdown-menu.open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}

.bk-dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.65rem 1rem;
  font-size: 0.83rem;
  color: var(--bk-text-primary);
  text-decoration: none;
  transition: background var(--bk-transition);
  border-bottom: 1px solid var(--bk-border);
}

.bk-dropdown-item:last-child { border-bottom: none; }

.bk-dropdown-item:hover {
  background: rgba(8, 61, 127, 0.05);
  color: var(--bk-blue);
}

[data-theme="dark"] .bk-dropdown-item:hover {
  background: rgba(74, 159, 229, 0.07);
  color: #4A9FE5;
}

.bk-dropdown-item i {
  width: 16px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--bk-text-muted);
}

.bk-dropdown-item-size {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--bk-text-muted);
  font-family: monospace;
}

/* ── ⑥ Color Section ─────────────────────────────────────────── */
.bk-color-family {
  margin-bottom: 3.5rem;
}

.bk-color-family-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--bk-text-primary);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.bk-color-family-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}

.bk-color-primary-row {
  display: flex;
  align-items: stretch;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.bk-color-primary-swatch {
  width: 180px;
  min-height: 140px;
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1rem 1.1rem;
  cursor: pointer;
  transition: all var(--bk-transition-slow);
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.bk-color-primary-swatch:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.22);
}

.bk-color-primary-swatch::after {
  content: attr(data-copy-label);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0,0,0,0.6);
  color: #fff;
  padding: 0.35rem 0.9rem;
  border-radius: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  opacity: 0;
  transition: opacity 180ms ease;
  pointer-events: none;
}

.bk-color-primary-swatch:hover::after {
  opacity: 1;
}

.bk-swatch-label {
  font-size: 0.82rem;
  font-weight: 700;
  opacity: 0.9;
}

.bk-swatch-value {
  font-size: 0.78rem;
  font-family: 'Courier New', Courier, monospace;
  opacity: 0.75;
  margin-top: 0.15rem;
}

.bk-color-scale {
  display: flex;
  gap: 4px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  flex: 1;
  min-width: 0;
}

.bk-scale-chip {
  flex: 1;
  min-height: 80px;
  cursor: pointer;
  position: relative;
  transition: all var(--bk-transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding-bottom: 0.4rem;
}

.bk-scale-chip:hover {
  transform: scaleY(1.06);
  z-index: 2;
}

.bk-scale-chip-label {
  font-size: 0.68rem;
  font-weight: 600;
  opacity: 0;
  transition: opacity 180ms ease;
  color: inherit;
  text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

.bk-scale-chip:hover .bk-scale-chip-label {
  opacity: 1;
}

.bk-scale-chip-hex {
  font-size: 0.6rem;
  font-family: monospace;
  opacity: 0;
  transition: opacity 180ms ease;
  margin-top: 1px;
}

.bk-scale-chip:hover .bk-scale-chip-hex {
  opacity: 0.8;
}

/* Format toggle display */
.bk-color-value-display {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

/* ── Gradient Showcase ────────────────────────────────────────── */
.bk-gradient-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}

.bk-gradient-card {
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--bk-card-shadow);
  border: 1px solid var(--bk-border);
  transition: all var(--bk-transition-slow);
}

.bk-gradient-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--bk-card-shadow-hover);
}

.bk-gradient-preview {
  height: 120px;
}

.bk-gradient-info {
  padding: 1rem 1.1rem;
  background: var(--bk-surface);
}

.bk-gradient-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--bk-text-primary);
  margin-bottom: 0.2rem;
}

.bk-gradient-code {
  font-size: 0.75rem;
  color: var(--bk-text-muted);
  font-family: monospace;
  cursor: pointer;
}

.bk-gradient-code:hover {
  color: var(--bk-blue);
}

/* ── ⑦ Typography Section ────────────────────────────────────── */
.bk-type-specimen {
  background: var(--bk-surface);
  border: 2px dashed var(--bk-border);
  border-radius: var(--bk-card-radius);
  padding: 2.5rem;
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--bk-text-primary);
  min-height: 120px;
  outline: none;
  transition: border-color var(--bk-transition);
  letter-spacing: -0.03em;
  margin-bottom: 2rem;
}

.bk-type-specimen:focus {
  border-color: var(--bk-blue);
  border-style: solid;
}

.bk-type-specimen:focus-visible {
  outline: none;
}

.bk-specimen-hint {
  display: block;
  text-align: right;
  font-size: 0.8rem;
  color: var(--bk-text-muted);
  margin-top: -1.5rem;
  margin-bottom: 2rem;
}

.bk-weight-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 3rem;
}

.bk-weight-card {
  background: var(--bk-surface);
  border: 1px solid var(--bk-border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: all var(--bk-transition);
}

.bk-weight-card:hover {
  border-color: rgba(8, 61, 127, 0.2);
  box-shadow: var(--bk-card-shadow);
  transform: translateY(-2px);
}

.bk-weight-sample {
  font-size: 2.2rem;
  line-height: 1;
  color: var(--bk-text-primary);
  margin-bottom: 0.75rem;
}

.bk-weight-label {
  font-size: 0.8rem;
  color: var(--bk-text-muted);
}

.bk-weight-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--bk-text-primary);
}

/* Type Scale */
.bk-scale-table {
  background: var(--bk-surface);
  border: 1px solid var(--bk-border);
  border-radius: var(--bk-card-radius);
  overflow: hidden;
}

.bk-scale-row {
  display: flex;
  align-items: center;
  padding: 1.1rem 1.5rem;
  border-bottom: 1px solid var(--bk-border);
  gap: 1.5rem;
  transition: background var(--bk-transition);
}

.bk-scale-row:last-child { border-bottom: none; }
.bk-scale-row:hover { background: var(--bk-surface-alt); }

.bk-scale-meta {
  width: 80px;
  flex-shrink: 0;
}

.bk-scale-name {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--bk-blue);
  font-family: monospace;
}

.bk-scale-size {
  font-size: 0.75rem;
  color: var(--bk-text-muted);
}

.bk-scale-example {
  color: var(--bk-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.bk-font-stack-box {
  background: var(--bk-surface-alt);
  border: 1px solid var(--bk-border);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.bk-font-stack-code {
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.82rem;
  color: var(--bk-text-primary);
  flex: 1;
  min-width: 0;
  overflow-x: auto;
}

/* ── ⑧ Icon Section ──────────────────────────────────────────── */
.bk-icon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1rem;
}

.bk-icon-card {
  background: var(--bk-surface);
  border: 1px solid var(--bk-border);
  border-radius: 12px;
  padding: 1.5rem 1rem;
  text-align: center;
  transition: all var(--bk-transition);
}

.bk-icon-card:hover {
  border-color: rgba(8, 61, 127, 0.22);
  transform: translateY(-3px);
  box-shadow: var(--bk-card-shadow);
}

.bk-icon-card i {
  color: var(--bk-blue);
  display: block;
  margin-bottom: 0.75rem;
}

[data-theme="dark"] .bk-icon-card i { color: #4A9FE5; }

.bk-icon-size-label {
  font-size: 0.75rem;
  color: var(--bk-text-muted);
  display: block;
  margin-bottom: 0.15rem;
}

.bk-icon-px-label {
  font-size: 0.78rem;
  font-weight: 600;
  font-family: monospace;
  color: var(--bk-text-primary);
}

/* ── ⑨ Spacing Section ──────────────────────────────────────── */
.bk-spacing-grid {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.bk-spacing-row {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  background: var(--bk-surface);
  border: 1px solid var(--bk-border);
  border-radius: 10px;
  padding: 0.85rem 1.25rem;
  transition: background var(--bk-transition);
}

.bk-spacing-row:hover { background: var(--bk-surface-alt); }

.bk-spacing-name {
  width: 60px;
  font-family: monospace;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--bk-blue);
  flex-shrink: 0;
}

[data-theme="dark"] .bk-spacing-name { color: #4A9FE5; }

.bk-spacing-bar-wrap {
  flex: 1;
  height: 20px;
  background: var(--bk-surface-alt);
  border-radius: 4px;
  overflow: hidden;
}

.bk-spacing-bar {
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--bk-blue), #4A9FE5);
  transition: width var(--bk-transition-slow);
}

.bk-spacing-val {
  width: 60px;
  text-align: right;
  font-family: monospace;
  font-size: 0.82rem;
  color: var(--bk-text-muted);
  flex-shrink: 0;
}

/* ── ⑩ Do's & Don'ts ──────────────────────────────────────────── */
.bk-dos-donts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 768px) {
  .bk-dos-donts-grid { grid-template-columns: 1fr; }
}

.bk-dos-card,
.bk-donts-card {
  border-radius: var(--bk-card-radius);
  overflow: hidden;
  border: 1px solid var(--bk-border);
}

.bk-dos-header,
.bk-donts-header {
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1rem;
  font-weight: 700;
}

.bk-dos-header {
  background: rgba(34, 197, 94, 0.10);
  color: #16a34a;
  border-bottom: 2px solid rgba(34, 197, 94, 0.25);
}

[data-theme="dark"] .bk-dos-header {
  background: rgba(34, 197, 94, 0.08);
  color: #4ade80;
}

.bk-donts-header {
  background: rgba(239, 68, 68, 0.08);
  color: #dc2626;
  border-bottom: 2px solid rgba(239, 68, 68, 0.22);
}

[data-theme="dark"] .bk-donts-header {
  background: rgba(239, 68, 68, 0.07);
  color: #f87171;
}

.bk-dos-body,
.bk-donts-body {
  padding: 1.5rem;
  background: var(--bk-surface);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.bk-rule-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--bk-text-primary);
}

.bk-rule-item i {
  flex-shrink: 0;
  margin-top: 0.15rem;
  font-size: 0.85rem;
}

.bk-dos-body .bk-rule-item i { color: #16a34a; }
.bk-donts-body .bk-rule-item i { color: #dc2626; }

[data-theme="dark"] .bk-dos-body .bk-rule-item i { color: #4ade80; }
[data-theme="dark"] .bk-donts-body .bk-rule-item i { color: #f87171; }

/* ── ⑪ Download CTA Section ──────────────────────────────────── */
.bk-download-cta {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #083D7F 0%, #063D6E 50%, #042D52 100%);
  border-radius: 28px;
  padding: 5rem 3rem;
  text-align: center;
  margin: 0 auto;
  max-width: 960px;
}

.bk-download-cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(74, 159, 229, 0.2) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 30%, rgba(232, 150, 63, 0.15) 0%, transparent 50%);
  pointer-events: none;
}

.bk-download-cta-inner {
  position: relative;
  z-index: 1;
}

.bk-download-cta-title {
  font-size: clamp(1.8rem, 4vw, 2.75rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.bk-download-cta-sub {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.72);
  max-width: 520px;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}

.bk-download-cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.bk-btn-primary-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.9rem 2rem;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  background: var(--bk-orange);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--bk-transition);
  box-shadow: 0 6px 24px rgba(232, 150, 63, 0.4);
}

.bk-btn-primary-cta:hover {
  background: #D88920;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 32px rgba(232, 150, 63, 0.55);
}

.bk-btn-outline-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.9rem 2rem;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.85);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.22);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--bk-transition);
  backdrop-filter: blur(8px);
}

.bk-btn-outline-cta:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  transform: translateY(-2px);
}

.bk-download-cta-note {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.5);
}

/* ── ⑫ Toast Notification ─────────────────────────────────────── */
.bk-toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.bk-toast {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1.25rem;
  background: var(--bk-blue);
  color: #fff;
  border-radius: 12px;
  font-size: 0.875rem;
  font-weight: 600;
  box-shadow: 0 8px 32px rgba(8, 61, 127, 0.35);
  animation: bk-toast-in 260ms cubic-bezier(0.4, 0, 0.2, 1) both;
  pointer-events: all;
  max-width: 300px;
}

.bk-toast.dismissing {
  animation: bk-toast-out 240ms cubic-bezier(0.4, 0, 0.2, 1) both;
}

.bk-toast i { font-size: 0.9rem; }

@keyframes bk-toast-in {
  from { opacity: 0; transform: translateX(24px) translateY(8px); }
  to   { opacity: 1; transform: translateX(0) translateY(0); }
}

@keyframes bk-toast-out {
  from { opacity: 1; transform: translateX(0); }
  to   { opacity: 0; transform: translateX(32px); }
}

/* ── General Utility ─────────────────────────────────────────── */
.bk-copy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--bk-border);
  background: var(--bk-surface);
  color: var(--bk-text-muted);
  cursor: pointer;
  transition: all var(--bk-transition);
  font-size: 0.8rem;
  flex-shrink: 0;
}

.bk-copy-btn:hover {
  background: var(--bk-blue);
  color: #fff;
  border-color: var(--bk-blue);
}

[data-theme="dark"] .bk-copy-btn:hover {
  background: #4A9FE5;
  border-color: #4A9FE5;
}

.bk-divider {
  height: 1px;
  background: var(--bk-border);
  margin: 2.5rem 0;
}

.bk-subsection-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--bk-text-primary);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.bk-subsection-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--bk-border);
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 992px) {
  --bk-section-gap: 80px;
}

@media (max-width: 768px) {
  .bk-hero-content { padding: 6rem 1rem 4rem; }
  .bk-hero-glass-card { flex-wrap: wrap; gap: 1rem; padding: 1rem 1.5rem; }
  .bk-logo-grid { grid-template-columns: 1fr; }
  .bk-color-primary-row { flex-direction: column; }
  .bk-color-primary-swatch { width: 100%; min-height: 100px; }
  .bk-color-scale { min-height: 60px; }
  .bk-controls { flex-direction: column; align-items: flex-start; }
  .bk-btn-download-all { margin-left: 0; }
  .bk-download-cta { padding: 3rem 1.5rem; border-radius: 20px; }
  .bk-nav-list { justify-content: flex-start; }
  .bk-weight-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .bk-weight-grid { grid-template-columns: 1fr; }
  .bk-icon-grid { grid-template-columns: repeat(3, 1fr); }
  .bk-toast-container { right: 1rem; bottom: 1rem; }
}