/* ==========================================================================
   VNTENDER — HIGH-END DESIGN SYSTEM (PHƯƠNG ÁN 1: HOÀNG KIM THỔ & THẠCH ANH ĐEN)
   Phong thủy: Hợp Mệnh Thổ (Vàng Hoàng Thổ + Thạch Anh Titan Đen + Amber Ánh Kim)
   Typography: Be Vietnam Pro (Chuẩn 100% tiếng Việt, nạp font cục bộ không lỗi)
   ========================================================================== */

@import url('./fonts.css');
@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400;1,600;1,700&display=swap');

:root {
  /* Color Palette — Imperial Gold & Obsidian Tech */
  --bg-primary: #0A0D12;
  --bg-secondary: #0F141D;
  --bg-tertiary: #151C28;
  --bg-card: rgba(16, 22, 32, 0.78);
  --bg-card-hover: rgba(24, 32, 46, 0.9);
  --bg-glass: rgba(11, 15, 22, 0.82);

  /* Gold & Earth Accents */
  --gold-primary: #E5A93C;
  --gold-light: #FDE68A;
  --gold-dark: #B47818;
  --gold-muted: rgba(229, 169, 60, 0.15);
  --amber-glow: #F59E0B;
  
  /* Borders */
  --border-subtle: rgba(229, 169, 60, 0.16);
  --border-medium: rgba(229, 169, 60, 0.35);
  --border-bright: rgba(253, 230, 138, 0.6);

  /* Typography Colors */
  --text-heading: #F9FAFB;
  --text-body: #CBD5E1;
  --text-muted: #8492A6;
  --text-gold: #F5BE58;

  /* Gradients */
  --gradient-gold: linear-gradient(135deg, #FFF3BF 0%, #E5A93C 50%, #B47818 100%);
  --gradient-card: linear-gradient(145deg, rgba(22, 30, 44, 0.85) 0%, rgba(12, 16, 24, 0.92) 100%);
  --gradient-hero: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(229, 169, 60, 0.15), transparent 70%);
  
  /* Shadows */
  --shadow-gold: 0 10px 30px -10px rgba(229, 169, 60, 0.35);
  --shadow-gold-lg: 0 20px 45px -10px rgba(229, 169, 60, 0.45);
  --shadow-card: 0 20px 40px -15px rgba(0, 0, 0, 0.7);
  --shadow-glow: 0 0 25px rgba(229, 169, 60, 0.25);

  /* Layout */
  --container-max: 1240px;
  --font-main: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-display: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-body);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 10%, rgba(229, 169, 60, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 60%, rgba(245, 158, 11, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 50% 90%, rgba(180, 120, 24, 0.07) 0%, transparent 40%);
}

.skip {
  position: absolute;
  top: -999px;
  left: 20px;
  background: var(--gold-primary);
  color: #000;
  padding: 8px 16px;
  z-index: 9999;
  border-radius: var(--radius-sm);
  font-weight: 700;
}
.skip:focus { top: 20px; }

.wrap {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

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

/* ==========================================================================
   TOPBAR & HEADER
   ========================================================================== */

.topline {
  background: rgba(10, 13, 18, 0.95);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 8px 0;
  color: var(--text-gold);
  font-weight: 600;
}
.topline .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.topline-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.topline-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold-primary);
  box-shadow: 0 0 8px var(--gold-primary);
}

.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 78px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 14px;
}
.logo-mark-gold {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, #1C2331, #0E131C);
  border: 1px solid var(--border-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow);
  position: relative;
  overflow: hidden;
}
.logo-mark-gold::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(229, 169, 60, 0.3), transparent);
}
.logo-mark-gold svg {
  width: 26px;
  height: 26px;
  color: var(--gold-light);
  filter: drop-shadow(0 2px 4px rgba(229, 169, 60, 0.5));
}

.logo-text {
  display: flex;
  flex-direction: column;
}
.logo-text strong {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-heading);
}
.logo-text strong b {
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.logo-text small {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--gold-primary);
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav a, .nav-group > button {
  padding: 10px 16px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--text-body);
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}
.nav a:hover, .nav-group > button:hover, .nav a.active {
  color: var(--text-heading);
  background: rgba(229, 169, 60, 0.1);
}
.nav a.active {
  color: var(--gold-primary);
  font-weight: 600;
}

.nav-contact {
  background: linear-gradient(135deg, #E5A93C, #B47818) !important;
  color: #000 !important;
  font-weight: 700 !important;
  box-shadow: var(--shadow-gold);
  border: 1px solid var(--gold-light) !important;
  margin-left: 12px;
}
.nav-contact:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold-lg);
  color: #000 !important;
}

.nav-group {
  position: relative;
}
.dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  width: 280px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: 10px;
  display: none;
  flex-direction: column;
  gap: 4px;
  z-index: 100;
  backdrop-filter: blur(20px);
}
.nav-group:hover .dropdown {
  display: flex;
}
.dropdown a {
  padding: 10px 14px;
  font-size: 13.5px;
  border-radius: var(--radius-sm);
  justify-content: space-between;
}
.dropdown a:hover {
  background: rgba(229, 169, 60, 0.15);
  color: var(--gold-light);
}

.menu-button {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px;
  cursor: pointer;
  color: var(--text-heading);
}

/* ==========================================================================
   BUTTONS & BADGES
   ========================================================================== */

.btn-gold, .proof-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--gradient-gold);
  color: #0A0D12;
  font-weight: 700;
  font-size: 15px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-gold);
  border: 1px solid var(--gold-light);
  cursor: pointer;
  transition: var(--transition);
}
.btn-gold:hover, .proof-button:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-gold-lg);
  color: #000;
}

.btn-outline, .proof-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: rgba(22, 28, 40, 0.6);
  color: var(--text-heading);
  font-weight: 600;
  font-size: 15px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-medium);
  backdrop-filter: blur(10px);
  cursor: pointer;
  transition: var(--transition);
}
.btn-outline:hover, .proof-link:hover {
  background: rgba(229, 169, 60, 0.12);
  border-color: var(--gold-primary);
  color: var(--gold-light);
  transform: translateY(-2px);
}

.kicker, .proof-kicker, .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--gold-primary);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.kicker::before, .proof-kicker::before {
  content: '';
  width: 14px;
  height: 2px;
  background: var(--gold-primary);
}

/* ==========================================================================
   HERO SECTION — PA1 IMPERIAL GOLD & OBSIDIAN
   ========================================================================== */

.proof-hero {
  position: relative;
  padding: 80px 0 90px;
  background: var(--gradient-hero);
  border-bottom: 1px solid var(--border-subtle);
  overflow: hidden;
}

.proof-hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 50px;
  align-items: center;
}

.proof-hero-copy h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 4.6vw, 56px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--text-heading);
  margin-bottom: 24px;
}
.proof-hero-copy h1 em, .proof-hero-copy h1 b {
  font-style: normal;
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.proof-hero-copy p {
  font-size: 18px;
  line-height: 1.68;
  color: var(--text-body);
  margin-bottom: 36px;
  max-width: 580px;
}

.proof-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-stats-banner {
  display: flex;
  gap: 28px;
  padding-top: 28px;
  border-top: 1px solid var(--border-subtle);
}
.hero-stat-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 800;
  color: var(--gold-light);
  letter-spacing: -0.02em;
}
.hero-stat-item span {
  font-size: 12.5px;
  color: var(--text-muted);
}

.proof-hero-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-medium);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  background: #0E131C;
}
.proof-hero-visual img {
  width: 100%;
  height: 480px;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.proof-hero-visual:hover img {
  transform: scale(1.03);
}

.proof-image-badge {
  position: absolute;
  top: 18px;
  left: 18px;
  background: rgba(10, 13, 18, 0.85);
  backdrop-filter: blur(10px);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  font-size: 11px;
  font-weight: 700;
  color: var(--gold-light);
  letter-spacing: 0.05em;
}

.proof-float-card {
  position: absolute;
  bottom: 20px;
  left: 20px;
  right: 20px;
  background: rgba(15, 20, 29, 0.92);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow-card);
}
.proof-float-card .float-left span {
  font-size: 11px;
  font-weight: 700;
  color: var(--gold-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  display: block;
}
.proof-float-card .float-left strong {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-heading);
}
.proof-float-card .float-badge {
  background: rgba(229, 169, 60, 0.18);
  color: var(--gold-light);
  border: 1px solid var(--border-subtle);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 700;
}

/* ==========================================================================
   METRICS COUNTER STRIP
   ========================================================================== */

.metrics-strip {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  padding: 48px 0;
  position: relative;
}
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.metric-box {
  background: var(--gradient-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}
.metric-box:hover {
  border-color: var(--gold-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-gold);
}
.metric-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 20%;
  right: 20%;
  height: 2px;
  background: var(--gradient-gold);
}
.metric-value {
  font-family: var(--font-display);
  font-size: clamp(32px, 3vw, 42px);
  font-weight: 900;
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
  margin-bottom: 8px;
}
.metric-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 4px;
}
.metric-sub {
  font-size: 12px;
  color: var(--text-muted);
}

/* ==========================================================================
   4 CORE SERVICES (TRỤ CỘT DỊCH VỤ)
   ========================================================================== */

.section-services {
  padding: 100px 0;
  position: relative;
}
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 60px;
}
.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, 42px);
  font-weight: 800;
  color: var(--text-heading);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.section-header p {
  font-size: 16px;
  color: var(--text-body);
  line-height: 1.65;
}

.services-grid-4 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.service-card-premium {
  background: var(--gradient-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 38px 34px;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.service-card-premium:hover {
  border-color: var(--gold-primary);
  transform: translateY(-5px);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}
.service-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
}
.service-icon-box {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: rgba(229, 169, 60, 0.12);
  border: 1px solid var(--border-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gold-light);
}
.service-icon-box svg {
  width: 30px;
  height: 30px;
}
.service-number {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 900;
  color: rgba(229, 169, 60, 0.35);
}
.service-card-premium h3 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 12px;
}
.service-card-premium p {
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-body);
  margin-bottom: 24px;
}
.service-features-list {
  list-style: none;
  margin-bottom: 30px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.service-features-list li {
  font-size: 13.5px;
  color: var(--text-body);
  display: flex;
  align-items: center;
  gap: 10px;
}
.service-features-list li::before {
  content: '✓';
  color: var(--gold-primary);
  font-weight: 900;
  font-size: 14px;
}
.service-card-footer {
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.service-card-footer span {
  font-size: 13px;
  font-weight: 600;
  color: var(--gold-light);
}
.service-card-footer svg {
  width: 18px;
  height: 18px;
  transition: transform 0.3s;
}
.service-card-premium:hover .service-card-footer svg {
  transform: translateX(4px);
}

/* ==========================================================================
   PROJECTS SHOWCASE & FILTER SYSTEM
   ========================================================================== */

.section-projects {
  padding: 100px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.projects-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 45px;
  justify-content: center;
}
.filter-btn {
  background: var(--bg-tertiary);
  color: var(--text-body);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 10px 22px;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.filter-btn:hover {
  border-color: var(--gold-primary);
  color: var(--text-heading);
}
.filter-btn.active {
  background: var(--gradient-gold);
  color: #0A0D12;
  border-color: var(--gold-light);
  box-shadow: var(--shadow-gold);
  font-weight: 700;
}

.projects-grid, .proof-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.project-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.project-card:hover {
  border-color: var(--gold-primary);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

/* Cover Image của Dự án */
.project-card-cover {
  position: relative;
  width: 100%;
  height: 200px;
  overflow: hidden;
  background: #111622;
}
.project-card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  display: block;
}
.project-card:hover .project-card-cover img {
  transform: scale(1.06);
}
.project-card-cover::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 13, 18, 0.2) 0%, rgba(10, 13, 18, 0.85) 100%);
  pointer-events: none;
}
.project-category-overlay {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 2;
  background: rgba(10, 13, 18, 0.88);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 700;
  color: var(--gold-light);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.project-year-overlay {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 2;
  background: rgba(10, 13, 18, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  padding: 3px 8px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
}

/* Nội dung của Dự án */
.project-card-content {
  padding: 20px 22px 22px;
  display: flex;
  flex-direction: column;
  flex: 1;
  justify-content: space-between;
}

.project-budget-pill {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: rgba(229, 169, 60, 0.12);
  border: 1px solid var(--border-subtle);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
}
.project-budget-pill .pill-label {
  font-size: 12px;
  color: var(--text-muted);
}
.project-budget-pill strong {
  font-family: var(--font-display);
  font-size: 15px;
  color: var(--gold-light);
  font-weight: 800;
}

.project-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-heading);
  margin-bottom: 10px;
  min-height: 50px;
}

.project-client {
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.icon-client {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  color: var(--gold-primary);
}

.project-meta-box {
  background: rgba(10, 13, 18, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin-bottom: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.meta-item strong {
  font-size: 11.5px;
  color: var(--gold-primary);
  display: block;
  margin-bottom: 2px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.meta-item p {
  font-size: 12.5px;
  color: var(--text-body);
  line-height: 1.5;
}

.project-highlight-badge {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
}
.icon-check {
  width: 15px;
  height: 15px;
  color: #10B981;
  flex-shrink: 0;
}
.project-highlight-badge span {
  font-size: 12px;
  color: #D1FAE5;
  font-weight: 500;
  line-height: 1.4;
}

.project-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}
.project-num {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 800;
  color: rgba(229, 169, 60, 0.4);
}
.project-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 700;
  color: var(--gold-light);
}
.project-link:hover {
  color: #FFF;
}
.icon-arrow {
  width: 15px;
  height: 15px;
  transition: transform 0.2s;
}
.project-link:hover .icon-arrow {
  transform: translateX(4px);
}

/* ==========================================================================
   AI & BIM SECTION
   ========================================================================== */

.section-ai-bim {
  padding: 100px 0;
  position: relative;
  overflow: hidden;
}
.ai-bim-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.ai-bim-content h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, 42px);
  font-weight: 800;
  color: var(--text-heading);
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}
.ai-bim-content p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-body);
  margin-bottom: 30px;
}
.ai-feature-boxes {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-bottom: 36px;
}
.ai-feature-item {
  display: flex;
  gap: 16px;
  background: var(--gradient-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: var(--transition);
}
.ai-feature-item:hover {
  border-color: var(--gold-primary);
  transform: translateX(6px);
}
.ai-feature-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: rgba(229, 169, 60, 0.15);
  border: 1px solid var(--border-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gold-light);
  flex-shrink: 0;
}
.ai-feature-text h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 4px;
}
.ai-feature-text p {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0;
}

.ai-bim-visual {
  position: relative;
  background: var(--gradient-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-card), var(--shadow-glow);
}
.ai-bim-visual img {
  border-radius: var(--radius-md);
  width: 100%;
  height: auto;
}

/* ==========================================================================
   TIMELINE PROCESS 4 STEPS
   ========================================================================== */

.section-process {
  padding: 100px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
}
.process-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}
.process-grid-4::before {
  content: '';
  position: absolute;
  top: 40px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold-primary), transparent);
  z-index: 1;
}
.process-step-box {
  background: var(--gradient-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 30px 22px;
  position: relative;
  z-index: 2;
  transition: var(--transition);
  text-align: center;
}
.process-step-box:hover {
  border-color: var(--gold-primary);
  transform: translateY(-6px);
  box-shadow: var(--shadow-gold);
}
.step-bubble {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--gold-primary);
  box-shadow: var(--shadow-glow);
  color: var(--gold-light);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}
.process-step-box h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 10px;
}
.process-step-box p {
  font-size: 13.5px;
  color: var(--text-body);
  line-height: 1.55;
}

/* ==========================================================================
   TRUST BANNER & CLIENTS
   ========================================================================== */

.section-clients {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-subtle);
}
.clients-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  align-items: center;
}
.client-logo-box {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px 18px;
  text-align: center;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  transition: var(--transition);
}
.client-logo-box:hover {
  background: rgba(229, 169, 60, 0.08);
  border-color: var(--gold-primary);
  color: var(--gold-light);
  transform: translateY(-3px);
}

/* ==========================================================================
   CALL TO ACTION
   ========================================================================== */

.section-cta {
  padding: 100px 0;
  background: radial-gradient(circle at center, rgba(229, 169, 60, 0.12) 0%, transparent 70%);
  text-align: center;
  position: relative;
}
.cta-inner-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 70px 40px;
  box-shadow: var(--shadow-card), var(--shadow-glow);
  max-width: 900px;
  margin: 0 auto;
}
.cta-inner-card h2 {
  font-family: var(--font-display);
  font-size: clamp(30px, 4vw, 46px);
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 20px;
}
.cta-inner-card p {
  font-size: 17px;
  color: var(--text-body);
  max-width: 650px;
  margin: 0 auto 36px;
  line-height: 1.65;
}
.cta-buttons-wrap {
  display: flex;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.footer {
  background: #07090D;
  border-top: 1px solid var(--border-subtle);
  padding: 80px 0 30px;
  color: var(--text-muted);
  font-size: 14px;
}
.footer-top {
  display: grid;
  grid-template-columns: 2fr 1.2fr 1.2fr 1.6fr;
  gap: 40px;
  margin-bottom: 60px;
}
.footer-brand p {
  margin: 18px 0;
  line-height: 1.65;
  color: var(--text-body);
  max-width: 320px;
}
.footer-legal-badge {
  background: rgba(229, 169, 60, 0.08);
  border: 1px solid var(--border-subtle);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 12.5px;
  line-height: 1.6;
}
.footer-legal-badge strong {
  color: var(--gold-light);
}
.footer h3 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}
.footer ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.footer ul a {
  color: var(--text-body);
}
.footer ul a:hover {
  color: var(--gold-primary);
  padding-left: 4px;
}
.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
}

/* ==========================================================================
   INNER PAGES (ABOUT, SERVICES, CONTACT, 404)
   ========================================================================== */

.inner-hero {
  padding: 80px 0 60px;
  background: var(--gradient-hero);
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
}
.breadcrumbs {
  font-size: 13px;
  color: var(--gold-primary);
  margin-bottom: 16px;
  display: flex;
  gap: 8px;
}
.breadcrumbs a { color: var(--text-muted); }
.breadcrumbs a:hover { color: var(--gold-light); }
.inner-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 50px);
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 16px;
}
.inner-hero p {
  font-size: 18px;
  color: var(--text-body);
  max-width: 680px;
  line-height: 1.65;
}

/* Contact Form Grid */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 50px;
  padding: 80px 0;
}
.contact-info-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
}
.contact-form {
  background: var(--gradient-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 40px 34px;
  box-shadow: var(--shadow-card);
}
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}
.form-field.full {
  grid-column: span 2;
}
.form-field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 8px;
}
.form-field input, .form-field select, .form-field textarea {
  width: 100%;
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-size: 14.5px;
  color: var(--text-heading);
  font-family: var(--font-main);
  transition: var(--transition);
}
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  outline: none;
  border-color: var(--gold-primary);
  box-shadow: 0 0 0 3px rgba(229, 169, 60, 0.2);
}
.form-field textarea {
  min-height: 140px;
  resize: vertical;
}

/* Language Switcher */
.lang-switch {
  display: inline-flex;
  align-items: center;
  background: rgba(16, 22, 32, 0.85);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 3px 6px;
  gap: 4px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
}
.lang-switch .lang-item {
  padding: 3px 8px;
  border-radius: 4px;
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}
.lang-switch .lang-item:hover {
  color: var(--gold-light);
}
.lang-switch .lang-item.active {
  background: var(--gradient-gold);
  color: #0A0D12;
  font-weight: 800;
  box-shadow: 0 2px 6px rgba(229, 169, 60, 0.35);
}
.lang-switch .lang-sep {
  color: rgba(229, 169, 60, 0.3);
  font-size: 10px;
}

/* Key Sectors Showcase (Nhóm Lĩnh Vực Tiêu Biểu) */
.section-sectors {
  padding: 90px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
}
.sectors-grid-5 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}
.sector-card-premium {
  background: var(--gradient-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.sector-card-premium:hover {
  border-color: var(--gold-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-gold);
}
.sector-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.sector-icon-badge {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(229, 169, 60, 0.12);
  border: 1px solid var(--border-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gold-light);
}
.sector-icon-badge svg {
  width: 22px;
  height: 22px;
}
.sector-code {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 800;
  color: rgba(229, 169, 60, 0.45);
}
.sector-card-premium h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 10px;
  line-height: 1.4;
}
.sector-card-premium p {
  font-size: 13.5px;
  color: var(--text-body);
  line-height: 1.6;
  margin-bottom: 18px;
}
.sector-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.sector-tag {
  background: rgba(10, 13, 18, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 11.5px;
  color: var(--text-muted);
}

/* Trust Factors (Cam kết & Uy tín pháp lý) */
.section-trust {
  padding: 90px 0;
  position: relative;
}
.trust-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.trust-box {
  background: var(--gradient-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 30px 24px;
  transition: var(--transition);
  position: relative;
}
.trust-box:hover {
  border-color: var(--gold-primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-gold);
}
.trust-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(229, 169, 60, 0.12);
  border: 1px solid var(--border-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gold-light);
  margin-bottom: 20px;
}
.trust-icon svg {
  width: 24px;
  height: 24px;
}
.trust-box h4 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 10px;
}
.trust-box p {
  font-size: 13.5px;
  color: var(--text-body);
  line-height: 1.65;
}

/* Quick Lead Form on Homepage */
.section-quick-lead {
  padding: 80px 0;
  background: radial-gradient(circle at 50% 50%, rgba(229, 169, 60, 0.08) 0%, transparent 70%);
}
.quick-lead-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-card);
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */

@media (max-width: 1024px) {
  .proof-hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .proof-hero-visual img { height: 380px; }
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .projects-grid, .proof-grid { grid-template-columns: repeat(2, 1fr); }
  .sectors-grid-5 { grid-template-columns: repeat(2, 1fr); }
  .trust-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: repeat(2, 1fr); gap: 30px; }
  .ai-bim-grid { grid-template-columns: 1fr; }
  .process-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .process-grid-4::before { display: none; }
  .clients-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  .topline { display: none; }
  .nav { display: none; }
  .menu-button { display: block; }
  .services-grid-4 { grid-template-columns: 1fr; }
  .projects-grid, .proof-grid { grid-template-columns: 1fr; }
  .sectors-grid-5 { grid-template-columns: 1fr; }
  .trust-grid-4 { grid-template-columns: 1fr; }
  .metrics-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .quick-lead-card { padding: 24px; }
  .form-grid { grid-template-columns: 1fr; }
  .form-field.full { grid-column: span 1; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .clients-grid { grid-template-columns: repeat(2, 1fr); }
  .process-grid-4 { grid-template-columns: 1fr; }
}