/**
 * Broker.com.vn - Core Stylesheet: Light Fintech Premium
 * Pure CSS - No frameworks, Ultra-fast, Mobile-first, WCAG AA Compliant
 */

:root {
  /* Brand Palette */
  --bk-navy-950: #050C1A;
  --bk-navy-900: #0A192F;
  --bk-navy-800: #0F172A;
  --bk-navy-700: #1E293B;
  --bk-navy-600: #334155;

  /* CTA & Accent (Mint Teal) */
  --bk-teal-500: #14B8A6;
  --bk-teal-600: #0D9488;
  --bk-teal-700: #0F766E;
  --bk-teal-50:  #F0FDFA;
  --bk-teal-100: #CCFBF1;

  /* Slate Neutrals */
  --bk-white:     #FFFFFF;
  --bk-slate-50:  #F8FAFC;
  --bk-slate-100: #F1F5F9;
  --bk-slate-200: #E2E8F0;
  --bk-slate-300: #CBD5E1;
  --bk-slate-400: #94A3B8;
  --bk-slate-500: #64748B;
  --bk-slate-600: #475569;

  /* Financial Data Trends */
  --bk-green-500: #16A34A;
  --bk-green-50:  #ECFDF5;
  --bk-red-500:   #DC2626;
  --bk-red-50:    #FEF2F2;
  --bk-amber-500: #D97706;
  --bk-amber-50:  #FFFBEB;

  /* Typography (System stack for 0ms font delay & 0 CLS) */
  --bk-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  
  /* Radii & Shadows */
  --bk-radius-sm: 4px;
  --bk-radius-md: 8px;
  --bk-radius-lg: 12px;
  --bk-radius-xl: 16px;

  --bk-shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --bk-shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.07), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --bk-shadow-lg: 0 12px 24px -4px rgba(15, 23, 42, 0.12), 0 4px 6px -2px rgba(15, 23, 42, 0.04);
  --bk-shadow-focus: 0 0 0 3px rgba(13, 148, 136, 0.25);

  --bk-container: 1200px;
}

/* Base resets */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--bk-font-family);
  background-color: var(--bk-slate-50);
  color: var(--bk-navy-800);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--bk-teal-600);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover {
  color: var(--bk-teal-700);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.bk-container {
  width: 100%;
  max-width: var(--bk-container);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* TOP ANNOUNCEMENT BAR */
.bk-top-bar {
  background-color: var(--bk-navy-950);
  color: var(--bk-slate-300);
  font-size: 13px;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.bk-top-bar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}
.bk-top-links {
  display: flex;
  align-items: center;
  gap: 18px;
}
.bk-top-links a {
  color: var(--bk-slate-300);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
}
.bk-top-links a:hover {
  color: var(--bk-white);
}
.bk-top-hotline {
  color: var(--bk-teal-500) !important;
  font-weight: 700;
}

/* HEADER DESKTOP (< 70px) */
.bk-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bk-white);
  border-bottom: 1px solid var(--bk-slate-200);
  height: 68px;
  display: flex;
  align-items: center;
  box-shadow: 0 1px 4px rgba(0,0,0,0.03);
  backdrop-filter: blur(8px);
}
.bk-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}
.bk-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}
.bk-brand-logo {
  font-size: 24px;
  font-weight: 900;
  color: var(--bk-navy-950);
  letter-spacing: -0.03em;
}
.bk-brand-logo span {
  color: var(--bk-teal-600);
}
.bk-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}
.bk-nav-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--bk-navy-700);
  text-decoration: none;
  padding: 6px 0;
  position: relative;
  transition: color 0.15s;
}
.bk-nav-link:hover, .bk-nav-link.active {
  color: var(--bk-teal-600);
}
.bk-nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--bk-teal-600);
  border-radius: 2px;
}
.bk-header-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}
.bk-mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--bk-navy-900);
}

/* BUTTONS */
.bk-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.3;
  padding: 11px 22px;
  border-radius: var(--bk-radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none !important;
  transition: all 0.2s ease-in-out;
  min-height: 44px;
  box-sizing: border-box;
}
.bk-btn:focus-visible {
  outline: none;
  box-shadow: var(--bk-shadow-focus);
}
.bk-btn-primary {
  background-color: var(--bk-teal-600);
  color: var(--bk-white) !important;
}
.bk-btn-primary:hover {
  background-color: var(--bk-teal-700);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(13, 148, 136, 0.25);
}
.bk-btn-secondary {
  background-color: var(--bk-white);
  color: var(--bk-navy-900) !important;
  border-color: var(--bk-slate-300);
  box-shadow: var(--bk-shadow-sm);
}
.bk-btn-secondary:hover {
  background-color: var(--bk-slate-50);
  border-color: var(--bk-slate-400);
}
.bk-btn-zalo {
  background-color: #0068FF;
  color: #FFF !important;
}
.bk-btn-zalo:hover {
  background-color: #0056D2;
}
.bk-btn-outline {
  background-color: transparent;
  color: var(--bk-white) !important;
  border-color: rgba(255, 255, 255, 0.4);
}
.bk-btn-outline:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: var(--bk-white);
}
.bk-btn-sm {
  padding: 7px 14px;
  font-size: 13px;
  min-height: 36px;
}
.bk-btn-lg {
  padding: 14px 28px;
  font-size: 16px;
  min-height: 50px;
}

/* BADGES */
.bk-badge {
  display: inline-flex;
  align-items: center;
  font-size: 12px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--bk-radius-sm);
  line-height: 1.2;
}
.bk-badge-beginner {
  background-color: #ECFDF5;
  color: #065F46;
  border: 1px solid #A7F3D0;
}
.bk-badge-fee {
  background-color: #FEF3C7;
  color: #92400E;
  border: 1px solid #FDE68A;
}
.bk-badge-app {
  background-color: #EEF2FF;
  color: #3730A3;
  border: 1px solid #C7D2FE;
}
.bk-badge-support {
  background-color: #EFF6FF;
  color: #1E40AF;
  border: 1px solid #BFDBFE;
}
.bk-badge-mock {
  background-color: #F1F5F9;
  color: #64748B;
  border: 1px dashed #CBD5E1;
  font-size: 11px;
}

/* SECTIONS */
.bk-section {
  padding: 64px 0;
  position: relative;
}
.bk-section-alt {
  background-color: var(--bk-white);
  border-top: 1px solid var(--bk-slate-200);
  border-bottom: 1px solid var(--bk-slate-200);
}
.bk-section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px auto;
}
.bk-section-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--bk-teal-700);
  background-color: var(--bk-teal-50);
  border: 1px solid var(--bk-teal-100);
  padding: 4px 12px;
  border-radius: 9999px;
  margin-bottom: 12px;
}
.bk-section-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--bk-navy-950);
  margin: 0 0 12px 0;
  letter-spacing: -0.02em;
}
.bk-section-desc {
  font-size: 16px;
  color: var(--bk-slate-600);
  margin: 0;
}

/* HERO SECTION */
.bk-hero {
  padding: 56px 0 64px 0;
  background: linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
}
.bk-hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}
.bk-hero-tagline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  color: var(--bk-teal-700);
  background-color: var(--bk-teal-50);
  border: 1px solid var(--bk-teal-100);
  padding: 6px 14px;
  border-radius: 9999px;
  margin-bottom: 20px;
}
.bk-hero-h1 {
  font-size: 42px;
  font-weight: 900;
  color: var(--bk-navy-950);
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin: 0 0 20px 0;
}
.bk-hero-desc {
  font-size: 18px;
  color: var(--bk-slate-600);
  line-height: 1.6;
  margin: 0 0 32px 0;
}
.bk-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
}
.bk-hero-trust-points {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 13px;
  color: var(--bk-slate-500);
}
.bk-hero-trust-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* HERO WIDGET CARD */
.bk-hero-card {
  background: var(--bk-white);
  border: 1px solid var(--bk-slate-200);
  border-radius: var(--bk-radius-lg);
  padding: 24px;
  box-shadow: var(--bk-shadow-md);
}
.bk-hero-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--bk-slate-200);
  padding-bottom: 14px;
  margin-bottom: 16px;
}
.bk-hero-card-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--bk-navy-900);
}
.bk-hero-card-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px;
  border-radius: var(--bk-radius-md);
  border: 1px solid var(--bk-slate-200);
  margin-bottom: 10px;
  background-color: var(--bk-slate-50);
  transition: all 0.2s;
}
.bk-hero-card-item:hover {
  border-color: var(--bk-teal-500);
  background-color: var(--bk-white);
}
.bk-broker-mini {
  display: flex;
  align-items: center;
  gap: 12px;
}
.bk-broker-mini-logo {
  width: 40px;
  height: 40px;
  border-radius: var(--bk-radius-sm);
  background: var(--bk-navy-900);
  color: var(--bk-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 12px;
}
.bk-broker-mini-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--bk-navy-900);
}
.bk-broker-mini-badge {
  font-size: 11px;
  color: var(--bk-slate-500);
}
.bk-broker-mini-stat {
  text-align: right;
}
.bk-broker-mini-fee {
  font-size: 15px;
  font-weight: 800;
  color: var(--bk-teal-600);
}
.bk-broker-mini-sub {
  font-size: 11px;
  color: var(--bk-slate-500);
}

/* TRUST BAR */
.bk-trust-bar {
  background-color: var(--bk-white);
  border-bottom: 1px solid var(--bk-slate-200);
  padding: 24px 0;
}
.bk-trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.bk-trust-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.bk-trust-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--bk-teal-50);
  color: var(--bk-teal-600);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: 700;
  font-size: 18px;
}
.bk-trust-text-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--bk-navy-900);
  margin-bottom: 3px;
}
.bk-trust-text-desc {
  font-size: 13px;
  color: var(--bk-slate-500);
  line-height: 1.4;
}

/* INTERACTIVE CALCULATOR SECTION */
.bk-calc-wrapper {
  background-color: var(--bk-white);
  border: 1px solid var(--bk-slate-200);
  border-radius: var(--bk-radius-xl);
  box-shadow: var(--bk-shadow-md);
  padding: 36px;
  max-width: 960px;
  margin: 0 auto;
}
.bk-calc-tabs {
  display: flex;
  gap: 10px;
  border-bottom: 1px solid var(--bk-slate-200);
  padding-bottom: 16px;
  margin-bottom: 28px;
}
.bk-calc-tab-btn {
  background: none;
  border: none;
  padding: 8px 18px;
  font-size: 15px;
  font-weight: 700;
  color: var(--bk-slate-500);
  cursor: pointer;
  border-radius: var(--bk-radius-md);
  transition: all 0.2s;
}
.bk-calc-tab-btn.active {
  background-color: var(--bk-navy-900);
  color: var(--bk-white);
}
.bk-calc-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 36px;
  align-items: center;
}
.bk-calc-slider-group {
  margin-bottom: 24px;
}
.bk-calc-slider-label {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  font-weight: 700;
  color: var(--bk-navy-900);
  margin-bottom: 10px;
}
.bk-calc-slider-value {
  color: var(--bk-teal-600);
  font-size: 18px;
}
.bk-slider {
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: var(--bk-slate-200);
  outline: none;
  -webkit-appearance: none;
  cursor: pointer;
}
.bk-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bk-teal-600);
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(13, 148, 136, 0.4);
  border: 2px solid var(--bk-white);
}
.bk-calc-result-box {
  background: linear-gradient(135deg, var(--bk-navy-950) 0%, var(--bk-navy-900) 100%);
  border-radius: var(--bk-radius-lg);
  padding: 32px 24px;
  color: var(--bk-white);
  text-align: center;
}
.bk-calc-result-label {
  font-size: 13px;
  color: var(--bk-slate-300);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}
.bk-calc-result-number {
  font-size: 34px;
  font-weight: 900;
  color: var(--bk-teal-500);
  margin-bottom: 16px;
}
.bk-calc-result-detail {
  font-size: 13px;
  color: var(--bk-slate-300);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 16px;
  line-height: 1.6;
}

/* WIZARD CARD */
.bk-wizard-wrapper {
  max-width: 800px;
  margin: 0 auto;
  background-color: var(--bk-white);
  border: 1px solid var(--bk-slate-200);
  border-radius: var(--bk-radius-xl);
  box-shadow: var(--bk-shadow-md);
  padding: 40px;
}
.bk-wizard-progress-bar {
  height: 6px;
  background-color: var(--bk-slate-100);
  border-radius: 3px;
  margin-bottom: 24px;
  overflow: hidden;
}
.bk-wizard-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--bk-teal-600), var(--bk-teal-500));
  transition: width 0.3s ease;
}
.bk-wizard-step-info {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  font-weight: 600;
  color: var(--bk-slate-500);
  margin-bottom: 8px;
}
.bk-wizard-question {
  font-size: 22px;
  font-weight: 700;
  color: var(--bk-navy-950);
  margin: 0 0 24px 0;
}
.bk-wizard-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 32px;
}
.bk-quiz-btn {
  background-color: var(--bk-slate-50);
  border: 1.5px solid var(--bk-slate-200);
  border-radius: var(--bk-radius-md);
  padding: 16px 20px;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}
.bk-quiz-btn:hover {
  border-color: var(--bk-teal-500);
  background-color: var(--bk-teal-50);
}
.bk-quiz-btn.active {
  border-color: var(--bk-teal-600);
  background-color: var(--bk-teal-50);
  box-shadow: 0 0 0 2px rgba(13, 148, 136, 0.2);
}
.bk-quiz-btn-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--bk-navy-900);
  margin-bottom: 4px;
  display: block;
}
.bk-quiz-btn-sub {
  font-size: 13px;
  color: var(--bk-slate-500);
  display: block;
}

/* WIZARD RESULT & LEAD FORM */
.bk-wizard-results {
  display: none;
}
.bk-result-card {
  border: 1px solid var(--bk-slate-200);
  border-radius: var(--bk-radius-md);
  padding: 20px;
  margin-bottom: 20px;
  background-color: var(--bk-slate-50);
}
.bk-lead-form-box {
  background-color: var(--bk-teal-50);
  border: 1px solid var(--bk-teal-100);
  border-radius: var(--bk-radius-lg);
  padding: 24px;
  margin-top: 24px;
}
.bk-form-group {
  margin-bottom: 16px;
}
.bk-form-label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--bk-navy-800);
  margin-bottom: 6px;
}
.bk-input {
  width: 100%;
  padding: 11px 14px;
  font-size: 14px;
  border: 1px solid var(--bk-slate-300);
  border-radius: var(--bk-radius-md);
  background-color: var(--bk-white);
  font-family: inherit;
}
.bk-input:focus {
  outline: none;
  border-color: var(--bk-teal-600);
  box-shadow: var(--bk-shadow-focus);
}
.bk-checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 13px;
  color: var(--bk-slate-600);
  cursor: pointer;
}

/* COMPARISON TABLE */
.bk-table-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 20px;
}
.bk-filter-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.bk-filter-tab {
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 700;
  border-radius: 9999px;
  border: 1px solid var(--bk-slate-200);
  background-color: var(--bk-white);
  color: var(--bk-navy-700);
  cursor: pointer;
  transition: all 0.15s;
}
.bk-filter-tab.active, .bk-filter-tab:hover {
  background-color: var(--bk-navy-900);
  color: var(--bk-white);
  border-color: var(--bk-navy-900);
}
.bk-table-container {
  background-color: var(--bk-white);
  border: 1px solid var(--bk-slate-200);
  border-radius: var(--bk-radius-lg);
  overflow-x: auto;
  box-shadow: var(--bk-shadow-md);
}
.bk-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
}
.bk-table th {
  background-color: var(--bk-slate-100);
  padding: 16px 20px;
  font-weight: 700;
  font-size: 13px;
  color: var(--bk-navy-900);
  border-bottom: 1px solid var(--bk-slate-200);
  white-space: nowrap;
}
.bk-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--bk-slate-200);
  vertical-align: middle;
}
.bk-table tr:hover td {
  background-color: #FAFCFE;
}
.bk-table-fee {
  font-weight: 800;
  color: var(--bk-teal-700);
  font-size: 15px;
}
.bk-table-margin {
  font-weight: 700;
  color: var(--bk-navy-900);
}
.bk-table-date {
  font-size: 12px;
  color: var(--bk-slate-400);
}

/* CURATED CARDS (6 Nhóm) */
.bk-curated-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.bk-curated-card {
  background-color: var(--bk-white);
  border: 1px solid var(--bk-slate-200);
  border-radius: var(--bk-radius-lg);
  padding: 28px;
  transition: all 0.2s;
  box-shadow: var(--bk-shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.bk-curated-card:hover {
  transform: translateY(-3px);
  border-color: var(--bk-teal-500);
  box-shadow: var(--bk-shadow-lg);
}
.bk-curated-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--bk-radius-md);
  background-color: var(--bk-slate-100);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin-bottom: 18px;
}
.bk-curated-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--bk-navy-950);
  margin-bottom: 8px;
}
.bk-curated-desc {
  font-size: 14px;
  color: var(--bk-slate-600);
  margin-bottom: 20px;
  line-height: 1.5;
}

/* 3 STEPS */
.bk-steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.bk-step-item {
  background-color: var(--bk-white);
  border: 1px solid var(--bk-slate-200);
  border-radius: var(--bk-radius-lg);
  padding: 32px 24px;
  text-align: center;
}
.bk-step-number {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--bk-teal-600);
  color: var(--bk-white);
  font-size: 18px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px auto;
  box-shadow: 0 4px 10px rgba(13, 148, 136, 0.3);
}
.bk-step-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--bk-navy-900);
  margin-bottom: 8px;
}
.bk-step-desc {
  font-size: 14px;
  color: var(--bk-slate-600);
  line-height: 1.5;
}

/* ARTICLES GRID */
.bk-articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.bk-article-card {
  background: var(--bk-white);
  border: 1px solid var(--bk-slate-200);
  border-radius: var(--bk-radius-lg);
  overflow: hidden;
  box-shadow: var(--bk-shadow-sm);
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
}
.bk-article-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--bk-shadow-md);
  border-color: var(--bk-teal-500);
}
.bk-article-thumb {
  height: 160px;
  background: linear-gradient(135deg, var(--bk-navy-900) 0%, var(--bk-navy-800) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bk-white);
  font-weight: 800;
  font-size: 15px;
  padding: 20px;
  text-align: center;
}
.bk-article-content {
  padding: 22px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.bk-article-title {
  font-size: 16px;
  font-weight: 800;
  color: var(--bk-navy-900);
  line-height: 1.4;
  margin-bottom: 10px;
}
.bk-article-meta {
  font-size: 12px;
  color: var(--bk-slate-400);
}

/* FAQ ACCORDION (NATIVE HTML5) */
.bk-faq-list {
  max-width: 800px;
  margin: 0 auto;
}
.bk-faq-item {
  background-color: var(--bk-white);
  border: 1px solid var(--bk-slate-200);
  border-radius: var(--bk-radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color 0.2s;
}
.bk-faq-item[open] {
  border-color: var(--bk-teal-600);
}
.bk-faq-title {
  padding: 18px 24px;
  font-size: 16px;
  font-weight: 700;
  color: var(--bk-navy-900);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.bk-faq-title::-webkit-details-marker { display: none; }
.bk-faq-title::after {
  content: '+';
  font-size: 20px;
  color: var(--bk-slate-400);
  font-weight: 400;
}
.bk-faq-item[open] .bk-faq-title::after {
  content: '−';
  color: var(--bk-teal-600);
}
.bk-faq-content {
  padding: 0 24px 20px 24px;
  font-size: 14px;
  color: var(--bk-slate-600);
  line-height: 1.6;
}

/* FINAL CTA */
.bk-final-cta {
  background: linear-gradient(135deg, var(--bk-navy-950) 0%, var(--bk-navy-900) 100%);
  border-radius: var(--bk-radius-xl);
  padding: 64px 40px;
  text-align: center;
  color: var(--bk-white);
}
.bk-final-cta-title {
  font-size: 34px;
  font-weight: 900;
  color: var(--bk-white);
  margin-bottom: 16px;
}
.bk-final-cta-desc {
  font-size: 17px;
  color: var(--bk-slate-300);
  max-width: 600px;
  margin: 0 auto 32px auto;
}
.bk-final-cta-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* FLOATING ACTION WIDGET (HOTLINE + ZALO + NHÓM) */
.bk-floating-actions {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.bk-float-btn {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
  color: #FFF;
  font-size: 22px;
}
.bk-float-btn:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}
.bk-float-phone {
  background: linear-gradient(135deg, #16A34A, #15803D);
}
.bk-float-zalo {
  background: linear-gradient(135deg, #0068FF, #0052CC);
  font-weight: 900;
  font-size: 13px;
}
.bk-float-group {
  background: linear-gradient(135deg, #0D9488, #0F766E);
  font-size: 20px;
}

/* FOOTER */
.bk-footer {
  background-color: var(--bk-navy-950);
  color: var(--bk-slate-400);
  padding: 60px 0 32px 0;
  font-size: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.bk-footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 48px;
}
.bk-footer-col h4 {
  color: var(--bk-white);
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 18px;
}
.bk-footer-col ul {
  list-style: none;
}
.bk-footer-col li {
  margin-bottom: 10px;
}
.bk-footer-col a {
  color: var(--bk-slate-400);
  text-decoration: none;
}
.bk-footer-col a:hover {
  color: var(--bk-teal-500);
}
.bk-footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  font-size: 12px;
  color: var(--bk-slate-500);
  line-height: 1.7;
}

/* MOBILE STICKY BOTTOM BAR */
.bk-bottom-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 998;
  background-color: var(--bk-white);
  border-top: 1px solid var(--bk-slate-200);
  padding: 8px 12px;
  box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.08);
}
.bk-bottom-bar-inner {
  display: grid;
  grid-template-columns: 1fr 1fr 1.3fr;
  gap: 8px;
}
.bk-bottom-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  color: var(--bk-navy-700);
  text-decoration: none;
  padding: 6px 4px;
  border-radius: var(--bk-radius-sm);
  background-color: var(--bk-slate-100);
}
.bk-bottom-btn.active {
  background-color: var(--bk-teal-600);
  color: var(--bk-white);
}

/* TOAST NOTIFICATION */
.bk-toast {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 10001;
  background: var(--bk-navy-950);
  color: var(--bk-white);
  padding: 14px 20px;
  border-radius: var(--bk-radius-md);
  box-shadow: var(--bk-shadow-lg);
  font-size: 14px;
  display: none;
  border-left: 4px solid var(--bk-teal-500);
}

/* RESPONSIVE */
@media (max-width: 992px) {
  .bk-hero-grid, .bk-calc-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .bk-trust-grid, .bk-curated-grid, .bk-articles-grid, .bk-footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .bk-steps-grid {
    grid-template-columns: 1fr;
  }
  .bk-nav {
    display: none;
  }
  .bk-mobile-menu-btn {
    display: block;
  }
}

@media (max-width: 768px) {
  .bk-section { padding: 44px 0; }
  .bk-section-title { font-size: 26px; }
  .bk-hero-h1 { font-size: 30px; }
  .bk-hero-desc { font-size: 15px; }
  .bk-hero-actions { flex-direction: column; }
  .bk-hero-actions .bk-btn { width: 100%; }
  .bk-wizard-wrapper { padding: 20px; }
  .bk-wizard-options { grid-template-columns: 1fr; }
  .bk-trust-grid, .bk-curated-grid, .bk-articles-grid, .bk-footer-grid { grid-template-columns: 1fr; }
  .bk-bottom-bar { display: block; }
  body { padding-bottom: 64px; }
  .bk-floating-actions { bottom: 74px; right: 16px; }
}