/* ==========================================================================
   UT-VIETTEL V13 - OFFICIAL VIETTEL LIGHT FOOTER SYSTEM (2026)
   Matches viettel.vn/vx/ · Impeccable Standards
   ========================================================================== */

:root {
  /* 1. Viettel Official Red Ramps */
  --vt-red: #ee0033;
  --vt-red-hover: #d11313;
  --vt-red-soft: #fff1f3;
  --vt-red-glow: rgba(238, 0, 51, 0.16);
  --vt-red-border: rgba(238, 0, 51, 0.15);

  /* 2. Official viettel.vn Dark & Neutral Hierarchy */
  --vt-text-main: #151515;       /* Tiêu đề & nội dung chính */
  --vt-text-body: #282828;       /* Văn bản đoạn văn */
  --vt-text-muted: #737373;      /* Mô tả phụ, ngày tháng, nhãn phụ */
  --vt-text-light: #8c8c8c;      /* Văn bản mờ nhẹ */
  
  /* 3. Surface & Canvas Colors */
  --vt-bg-canvas: #f5f5f5;       /* Nền xám nhạt dịu mắt của viettel.vn */
  --vt-bg-card: #ffffff;         /* Nền thẻ trắng tinh */
  --vt-bg-glass: rgba(255, 255, 255, 0.95);
  
  /* 4. Borders & Lines */
  --vt-border: #e5e5e5;          /* Viền ngăn cách chuẩn */
  --vt-border-light: #f0f0f0;    /* Viền phụ siêu mỏng */
  --vt-green: #10b981;

  /* 5. Clean Light Footer */
  --vt-footer-bg: #ffffff;       /* Nền Footer trắng sáng sạch sẽ chuẩn viettel.vn */
  --vt-footer-border: #e5e5e5;
  --vt-footer-text: #595959;
  
  /* Dimensions & Radius */
  --vt-radius-card: 16px;
  --vt-radius-btn: 8px;
  --vt-radius-pill: 980px;
  --vt-shadow-clean: 0 2px 12px rgba(0, 0, 0, 0.04);
  --vt-shadow-hover: 0 10px 24px -2px rgba(238, 0, 51, 0.12);
  --font-base: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-base);
  background-color: var(--vt-bg-canvas);
  color: var(--vt-text-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; transition: all 0.2s ease; }
.wrap { width: min(1180px, calc(100% - 36px)); margin: auto; }

/* Topbar */
.vt-topbar {
  background: #ffffff;
  border-bottom: 1px solid var(--vt-border);
  font-size: 13px;
  color: var(--vt-text-muted);
  padding: 8px 0;
}
.vt-topbar .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.vt-topbar b { color: var(--vt-red); font-weight: 700; }

/* Header */
.vt-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--vt-bg-glass);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--vt-border);
  height: 70px;
  display: flex;
  align-items: center;
}
.vt-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}
.vt-brand-logo {
  display: inline-flex;
  align-items: center;
}
.vt-brand-logo img {
  height: 38px;
  width: auto;
  object-fit: contain;
  display: block;
}
.vt-menu {
  display: flex;
  gap: 28px;
  font-weight: 600;
  font-size: 14px;
}
.vt-menu a { color: var(--vt-text-main); }
.vt-menu a:hover { color: var(--vt-red); }
.vt-menu-toggle {
  display: none;
  background: none;
  border: 0;
  font-size: 22px;
  color: var(--vt-text-main);
  cursor: pointer;
}

/* Nút bấm Viettel Style */
.vt-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 22px;
  border-radius: var(--vt-radius-btn);
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s ease;
  user-select: none;
  font-family: var(--font-base);
}
.vt-btn:active { transform: scale(0.98); }
.vt-btn-red {
  background: var(--vt-red);
  color: #ffffff !important;
  box-shadow: 0 4px 12px var(--vt-red-glow);
}
.vt-btn-red:hover { background: var(--vt-red-hover); }
.vt-btn-outline {
  background: #ffffff;
  color: var(--vt-text-main);
  border-color: var(--vt-border);
}
.vt-btn-outline:hover { background: var(--vt-red-soft); border-color: var(--vt-red); color: var(--vt-red); }

/* ==========================================================================
   HERO BANNER & FAST CHECK CARD
   ========================================================================== */
.vt-portal-hero {
  padding: 45px 0 50px;
  background: #ffffff;
  border-bottom: 1px solid var(--vt-border);
}
.vt-hero-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}
.vt-hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--vt-red-soft);
  color: var(--vt-red);
  padding: 4px 12px;
  border-radius: var(--vt-radius-pill);
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 14px;
  border: 1px solid var(--vt-red-border);
}
.vt-portal-hero h1 {
  font-size: 38px;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.5px;
  margin-bottom: 14px;
  color: var(--vt-text-main);
}
.vt-portal-hero h1 span { color: var(--vt-red); }
.vt-portal-hero p {
  font-size: 16px;
  color: var(--vt-text-muted);
  margin-bottom: 24px;
  max-width: 500px;
}
.vt-hero-actions { display: flex; gap: 12px; }

/* Fast Check Card */
.vt-fast-check-card {
  background: #ffffff;
  border-radius: var(--vt-radius-card);
  padding: 28px 24px;
  box-shadow: var(--vt-shadow-clean);
  border: 1px solid var(--vt-border);
}
.vt-fast-check-card h3 { font-size: 19px; font-weight: 800; margin-bottom: 6px; color: var(--vt-text-main); }
.vt-fast-check-card p { font-size: 13px; color: var(--vt-text-muted); margin-bottom: 18px; }
.vt-form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 10px; }
.vt-input-wrap { position: relative; width: 100%; }
.vt-input {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--vt-border);
  border-radius: var(--vt-radius-btn);
  font-size: 13px;
  outline: none;
  background: #fafafa;
  font-family: inherit;
}
.vt-input:focus { border-color: var(--vt-red); background: #ffffff; box-shadow: 0 0 0 3px rgba(238, 0, 51, 0.1); }
.vt-gps-btn {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  background: #ffffff;
  border: 1px solid var(--vt-border);
  color: var(--vt-text-main);
  font-size: 11px;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 6px;
  cursor: pointer;
}
.vt-gps-btn:hover { background: var(--vt-red-soft); color: var(--vt-red); border-color: var(--vt-red); }
.vt-btn-submit { width: 100%; padding: 12px; font-size: 14px; margin-top: 6px; }

/* ==========================================================================
   CAM KẾT VÀNG VIETTEL
   ========================================================================== */
.vt-trust-bar {
  background: #f5f5f5;
  border-bottom: 1px solid var(--vt-border);
  padding: 20px 0;
}
.vt-trust-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.vt-trust-box {
  display: flex;
  align-items: center;
  gap: 14px;
}
.vt-trust-icon {
  width: 42px;
  height: 42px;
  background: #ffffff;
  color: var(--vt-red);
  font-size: 18px;
  border-radius: var(--vt-radius-btn);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid var(--vt-border);
}
.vt-trust-info strong {
  display: block;
  font-size: 14px;
  font-weight: 800;
  color: var(--vt-text-main);
}
.vt-trust-info span {
  font-size: 12px;
  color: var(--vt-text-muted);
}

/* ==========================================================================
   SMART ADVISOR
   ========================================================================== */
.vt-advisor-section {
  padding: 50px 0 70px;
  background: #ffffff;
}
.vt-advisor-card {
  background: #ffffff;
  border: 1px solid var(--vt-border);
  border-radius: var(--vt-radius-card);
  box-shadow: var(--vt-shadow-clean);
  padding: 36px 32px;
  max-width: 860px;
  margin: 0 auto;
}
.vt-advisor-header {
  text-align: center;
  margin-bottom: 30px;
}
.vt-advisor-header h2 {
  font-size: 28px;
  font-weight: 900;
  letter-spacing: -0.5px;
  margin-bottom: 6px;
  color: var(--vt-text-main);
}
.vt-advisor-header p {
  color: var(--vt-text-muted);
  font-size: 15px;
}
.vt-step-group {
  margin-bottom: 24px;
}
.vt-step-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--vt-text-main);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.vt-step-num {
  width: 20px;
  height: 20px;
  background: var(--vt-red-soft);
  color: var(--vt-red);
  font-size: 11px;
  font-weight: 800;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.vt-options-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.vt-opt-btn {
  background: #fafafa;
  border: 1px solid var(--vt-border);
  border-radius: var(--vt-radius-btn);
  padding: 14px 10px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.vt-opt-btn:hover { border-color: #d1d1d1; background: #ffffff; }
.vt-opt-btn.selected {
  background: var(--vt-red-soft);
  border-color: var(--vt-red);
  box-shadow: 0 2px 8px var(--vt-red-glow);
}
.vt-opt-icon { font-size: 20px; }
.vt-opt-title { font-size: 13px; font-weight: 700; color: var(--vt-text-main); }
.vt-opt-btn.selected .vt-opt-title { color: var(--vt-red); }
.vt-opt-sub { font-size: 11px; color: var(--vt-text-muted); }

/* Result Box (Viền đỏ mềm tinh tế trên nền sáng) */
.vt-result-box {
  margin-top: 30px;
  background: #ffffff;
  border: 2px solid var(--vt-red);
  border-radius: var(--vt-radius-card);
  padding: 26px 30px;
  color: var(--vt-text-main);
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 20px;
  align-items: center;
  box-shadow: 0 8px 24px -2px rgba(238, 0, 51, 0.12);
}
.vt-result-tag {
  background: var(--vt-red-soft);
  color: var(--vt-red);
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: var(--vt-radius-pill);
  display: inline-block;
}
.vt-promo-badge {
  display: inline-flex;
  align-items: center;
  background: rgba(16, 185, 129, 0.15);
  color: #059669;
  border: 1px solid rgba(5, 150, 105, 0.3);
  padding: 3px 8px;
  border-radius: var(--vt-radius-pill);
  font-size: 11px;
  font-weight: 700;
  margin-left: 8px;
}
.vt-result-name { font-size: 26px; font-weight: 900; margin: 6px 0; color: var(--vt-text-main); }
.vt-result-desc { font-size: 13px; color: var(--vt-text-muted); line-height: 1.5; }
.vt-result-price-wrap { text-align: right; border-left: 1px solid var(--vt-border); padding-left: 20px; }
.vt-result-price { font-size: 34px; font-weight: 900; color: var(--vt-red); line-height: 1; }
.vt-result-price span { font-size: 15px; color: var(--vt-red); margin-left: 2px; }
.vt-result-unit { font-size: 12px; color: var(--vt-text-muted); margin: 4px 0 14px; }

/* Bảng giá chi tiết & Khối nội dung */
.vt-plans-detail-section {
  padding: 50px 0;
  background: #f5f5f5;
  border-top: 1px solid var(--vt-border);
}
.vt-table-wrap {
  background: #ffffff;
  border-radius: var(--vt-radius-card);
  border: 1px solid var(--vt-border);
  overflow: hidden;
  box-shadow: var(--vt-shadow-clean);
  margin-bottom: 30px;
}
.vt-table-wrap table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}
.vt-table-wrap th {
  background: #fafafa;
  color: var(--vt-text-main);
  font-size: 13px;
  font-weight: 800;
  padding: 14px 18px;
  border-bottom: 1px solid var(--vt-border);
  text-transform: uppercase;
}
.vt-table-wrap td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--vt-border-light);
  font-size: 14px;
  color: var(--vt-text-body);
}
.vt-table-wrap tr:last-child td { border-bottom: 0; }
.vt-table-wrap tr:hover td { background: #fafafa; }
.vt-table-wrap td b { color: var(--vt-text-main); }
.vt-price-text { font-weight: 800; color: var(--vt-red); }

/* Combo & Camera */
.vt-services-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 30px;
}
.vt-service-banner {
  background: #ffffff;
  border: 1px solid var(--vt-border);
  border-radius: var(--vt-radius-card);
  padding: 24px;
  box-shadow: var(--vt-shadow-clean);
}
.vt-service-banner h3 { font-size: 18px; font-weight: 800; margin: 8px 0; color: var(--vt-text-main); }
.vt-service-banner p { color: var(--vt-text-muted); font-size: 13px; margin-bottom: 16px; }

/* Bài viết */
.vt-news-section {
  padding: 50px 0;
  background: #ffffff;
  border-top: 1px solid var(--vt-border);
}
.vt-news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.vt-news-card {
  background: #f5f5f5;
  border: 1px solid var(--vt-border);
  border-radius: var(--vt-radius-card);
  padding: 22px;
  transition: all 0.2s ease;
}
.vt-news-card:hover {
  background: #ffffff;
  border-color: var(--vt-red);
  box-shadow: var(--vt-shadow-hover);
}
.vt-news-date { font-size: 12px; color: var(--vt-red); font-weight: 700; margin-bottom: 8px; display: block; }
.vt-news-title { font-size: 15px; font-weight: 800; line-height: 1.4; margin-bottom: 8px; color: var(--vt-text-main); }
.vt-news-excerpt { font-size: 13px; color: var(--vt-text-muted); line-height: 1.5; }

/* ==========================================================================
   FOOTER NỀN SÁNG CHUẨN VIETTEL.VN/VX/ (#FFFFFF & #F5F5F5)
   ========================================================================== */
.vt-footer {
  background: var(--vt-footer-bg);
  color: var(--vt-footer-text);
  padding: 50px 0 25px;
  border-top: 1px solid var(--vt-footer-border);
}
.vt-footer-top {
  display: flex;
  align-items: center;
  gap: 30px;
  padding-bottom: 30px;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--vt-border);
}
.vt-footer-brand-logo img {
  height: 42px;
  width: auto;
  object-fit: contain;
  display: block;
}
.vt-footer-intro {
  font-size: 13px;
  line-height: 1.6;
  color: var(--vt-text-muted);
  max-width: 820px;
}
.vt-footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  margin-bottom: 35px;
}
.vt-footer-col {
  border-right: 1px solid var(--vt-border-light);
  padding-right: 20px;
}
.vt-footer-col:last-child {
  border-right: 0;
  padding-right: 0;
}
.vt-footer-title {
  color: var(--vt-text-main);
  font-size: 15px;
  font-weight: 800;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.vt-footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}
.vt-footer-links li {
  margin-bottom: 10px;
}
.vt-footer-links a {
  color: var(--vt-footer-text);
  font-size: 13px;
  line-height: 1.4;
}
.vt-footer-links a:hover {
  color: var(--vt-red);
}
.vt-promise-item {
  display: flex;
  gap: 8px;
  font-size: 13px;
  color: var(--vt-footer-text);
  margin-bottom: 12px;
  line-height: 1.4;
}
.vt-promise-item i {
  color: var(--vt-red);
  font-style: normal;
  font-weight: 800;
}
.vt-footer-contact-box {
  background: #f9f9f9;
  border: 1px solid var(--vt-border);
  border-radius: var(--vt-radius-btn);
  padding: 16px;
}
.vt-contact-label {
  display: block;
  font-size: 12px;
  color: var(--vt-text-muted);
  margin-bottom: 4px;
}
.vt-contact-phone {
  display: block;
  font-size: 20px;
  font-weight: 900;
  color: var(--vt-red);
  line-height: 1.2;
  margin-bottom: 4px;
}
.vt-contact-time {
  font-size: 11px;
  color: var(--vt-text-light);
}
.vt-disclaimer {
  border-top: 1px solid var(--vt-border);
  padding-top: 20px;
  font-size: 12px;
  color: var(--vt-text-muted);
  text-align: center;
  line-height: 1.6;
}

/* Mobile Sticky Bar */
.vt-mobile-bar { display: none; }

@media (max-width: 900px) {
  .vt-hero-layout { grid-template-columns: 1fr; gap: 30px; }
  .vt-trust-grid { grid-template-columns: 1fr; gap: 14px; }
  .vt-result-box { grid-template-columns: 1fr; gap: 16px; }
  .vt-result-price-wrap { text-align: left; border-left: 0; padding-left: 0; border-top: 1px solid var(--vt-border); padding-top: 14px; }
  .vt-services-row { grid-template-columns: 1fr; }
  .vt-news-grid { grid-template-columns: 1fr; }
  .vt-footer-top { flex-direction: column; align-items: flex-start; gap: 14px; }
  .vt-footer-grid { grid-template-columns: 1fr 1fr; }
  .vt-footer-col { border-right: 0; padding-right: 0; }
  .vt-menu { display: none; }
  .vt-desktop-cta { display: none; }
  .vt-menu-toggle { display: block; }
}

@media (max-width: 600px) {
  .vt-topbar { display: none; }
  .vt-header { height: 58px; }
  .vt-brand-logo img { height: 32px; }
  .vt-portal-hero { padding: 25px 0 30px; }
  .vt-portal-hero h1 { font-size: 25px; }
  .vt-advisor-section { padding: 30px 0 45px; }
  .vt-advisor-card { padding: 20px 14px; }
  .vt-options-grid { grid-template-columns: repeat(3, 1fr); gap: 6px; }
  .vt-opt-btn { padding: 10px 4px; }
  .vt-footer-grid { grid-template-columns: 1fr; gap: 20px; }

  .vt-mobile-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-top: 1px solid var(--vt-border);
    padding: 8px 12px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    box-shadow: 0 -4px 16px rgba(0,0,0,0.06);
  }
  .vt-mobile-bar a {
    padding: 10px;
    border-radius: var(--vt-radius-btn);
    font-size: 13px;
    font-weight: 700;
    text-align: center;
  }
  .vt-mobile-call { background: var(--vt-red-soft); color: var(--vt-red); }
  .vt-mobile-zalo { background: var(--vt-red); color: #ffffff; }

  body { padding-bottom: 60px; }
}

/* ==========================================================================
   ARTICLE / SINGLE POST LAYOUT & TYPOGRAPHY ENHANCEMENTS
   ========================================================================== */
.vt-article-wrapper {
  background: #ffffff;
}
.vt-crumb {
  padding: 16px 0 8px;
  font-size: 13px;
  color: var(--vt-text-muted);
}
.vt-crumb a { color: var(--vt-text-muted); }
.vt-crumb a:hover { color: var(--vt-red); }
.vt-crumb span { color: var(--vt-text-main); font-weight: 600; }

.vt-article-hero {
  padding: 15px 0 35px;
  border-bottom: 1px solid var(--vt-border);
  background: #ffffff;
}
.vt-article-hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 40px;
  align-items: center;
}
.vt-article-title {
  font-size: 32px;
  font-weight: 900;
  line-height: 1.3;
  color: var(--vt-text-main);
  margin: 10px 0 16px;
  letter-spacing: -0.5px;
}
.vt-article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--vt-text-muted);
}
.vt-author-avatar img {
  border-radius: 50%;
  display: block;
}
.vt-article-meta strong {
  display: block;
  color: var(--vt-text-main);
  font-size: 14px;
}
.vt-article-hero-brand {
  background: #f9f9f9;
  border: 1px solid var(--vt-border);
  border-radius: var(--vt-radius-card);
  padding: 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.vt-brand-caption {
  font-size: 12px;
  color: var(--vt-text-muted);
  font-weight: 700;
  margin-top: 8px;
}

/* Article Content Layout */
.vt-article-content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 45px;
  padding: 40px 0;
}
.vt-entry-content {
  font-size: 16px;
  line-height: 1.75;
  color: var(--vt-text-body);
}
.vt-entry-content h2 {
  font-size: 24px;
  font-weight: 900;
  color: var(--vt-text-main);
  margin: 35px 0 16px;
  line-height: 1.35;
}
.vt-entry-content h3 {
  font-size: 19px;
  font-weight: 800;
  color: var(--vt-text-main);
  margin: 28px 0 12px;
}
.vt-entry-content p {
  margin-bottom: 18px;
}
.vt-entry-content img {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  margin: 16px 0;
}
.vt-entry-content blockquote {
  background: var(--vt-red-soft);
  border: 1px solid var(--vt-red-border);
  border-radius: var(--vt-radius-card);
  padding: 20px 24px;
  margin: 24px 0;
  color: var(--vt-text-main);
  font-style: normal;
}
.vt-entry-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  border-radius: var(--vt-radius-btn);
  overflow: hidden;
  border: 1px solid var(--vt-border);
}
.vt-entry-content th {
  background: #f5f5f5;
  color: var(--vt-text-main);
  font-weight: 800;
  font-size: 13px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--vt-border);
  text-align: left;
}
.vt-entry-content td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--vt-border-light);
  font-size: 14px;
}
.vt-entry-content tr:last-child td { border-bottom: 0; }
.vt-entry-content tr:hover td { background: #fafafa; }

/* Author Box */
.vt-author-card {
  display: flex;
  align-items: center;
  gap: 18px;
  background: #f9f9f9;
  border: 1px solid var(--vt-border);
  border-radius: var(--vt-radius-card);
  padding: 24px;
  margin-top: 40px;
}
.vt-author-card img { border-radius: 50%; }
.vt-author-card strong { font-size: 16px; color: var(--vt-text-main); display: block; margin-bottom: 4px; }
.vt-author-card p { font-size: 13px; color: var(--vt-text-muted); margin: 0; }

/* Sticky Sidebar */
.vt-article-sidebar {
  position: sticky;
  top: 90px;
  align-self: start;
}
.vt-side-card {
  background: #ffffff;
  border: 1px solid var(--vt-border);
  border-radius: var(--vt-radius-card);
  padding: 24px;
  box-shadow: var(--vt-shadow-clean);
}
.vt-side-card h3 { font-size: 18px; font-weight: 800; margin-bottom: 8px; color: var(--vt-text-main); }
.vt-side-card p { font-size: 13px; color: var(--vt-text-muted); margin-bottom: 18px; }

@media (max-width: 900px) {
  .vt-article-hero-grid { grid-template-columns: 1fr; gap: 20px; }
  .vt-article-content-grid { grid-template-columns: 1fr; gap: 30px; }
  .vt-article-title { font-size: 24px; }
}