/* =============================================
   VIETTECH CORP - GLOBAL STYLESHEET
   Design System & Component Library
   ============================================= */

/* --- Google Fonts Import --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Playfair+Display:wght@700&display=swap');

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
  /* Colors */
  --primary: #0a2463;
  --primary-light: #1a3a7c;
  --primary-dark: #061840;
  --secondary: #e63946;
  --secondary-light: #ff4f5e;
  --accent: #1d84b5;
  --accent-light: #2aa0d8;
  --gold: #f4a261;
  --success: #2d6a4f;
  --warning: #f4a261;

  /* Neutrals */
  --white: #ffffff;
  --gray-50: #f8f9fa;
  --gray-100: #f1f3f5;
  --gray-200: #e9ecef;
  --gray-300: #dee2e6;
  --gray-400: #ced4da;
  --gray-500: #adb5bd;
  --gray-600: #6c757d;
  --gray-700: #495057;
  --gray-800: #343a40;
  --gray-900: #212529;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #0a2463 0%, #1d84b5 100%);
  --gradient-hero: linear-gradient(135deg, #061840 0%, #0a2463 40%, #1d84b5 100%);
  --gradient-card: linear-gradient(145deg, #ffffff 0%, #f8f9fa 100%);
  --gradient-accent: linear-gradient(135deg, #e63946 0%, #f4a261 100%);

  /* Typography */
  --font-main: 'Inter', sans-serif;
  --font-display: 'Playfair Display', serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.10), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.12), 0 4px 10px rgba(0,0,0,0.08);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15), 0 8px 20px rgba(0,0,0,0.10);
  --shadow-primary: 0 8px 24px rgba(10,36,99,0.25);
  --shadow-secondary: 0 8px 24px rgba(230,57,70,0.30);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Layout */
  --container-max: 1280px;
  --header-height: 80px;
  --sidebar-width: 280px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-main);
  font-size: var(--font-size-base);
  color: var(--gray-800);
  background-color: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: var(--font-main);
}

input, textarea, select {
  font-family: var(--font-main);
}

/* --- Preloader --- */
#preloader {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: var(--primary-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

#preloader.hidden {
  opacity: 0;
  visibility: hidden;
}

.preloader-inner {
  text-align: center;
}

.preloader-logo {
  font-size: 2rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 1.5rem;
  letter-spacing: 2px;
}

.preloader-logo span {
  color: var(--secondary);
}

.preloader-bar {
  width: 200px;
  height: 3px;
  background: rgba(255,255,255,0.15);
  border-radius: 99px;
  overflow: hidden;
  margin: 0 auto;
}

.preloader-bar-fill {
  height: 100%;
  background: var(--gradient-accent);
  border-radius: 99px;
  animation: preloaderFill 1.5s ease forwards;
}

@keyframes preloaderFill {
  0% { width: 0; }
  100% { width: 100%; }
}

/* --- Layout Utilities --- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-20) 0;
}

.section-sm {
  padding: var(--space-12) 0;
}

.section-lg {
  padding: var(--space-24) 0;
}

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-col { display: flex; flex-direction: column; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* --- Section Titles --- */
.section-title {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-title .subtitle {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--secondary);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: var(--space-3);
  position: relative;
  padding: 0 var(--space-4);
}

.section-title .subtitle::before,
.section-title .subtitle::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 30px;
  height: 2px;
  background: var(--secondary);
  transform: translateY(-50%);
}

.section-title .subtitle::before { right: 100%; }
.section-title .subtitle::after { left: 100%; }

.section-title h2 {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
  margin-bottom: var(--space-4);
}

.section-title p {
  font-size: var(--font-size-lg);
  color: var(--gray-600);
  max-width: 600px;
  margin: 0 auto;
}

.section-title .title-divider {
  width: 60px;
  height: 4px;
  background: var(--gradient-accent);
  border-radius: 2px;
  margin: var(--space-4) auto 0;
}

/* --- Header & Navigation --- */
.header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(10,36,99,0.08);
  z-index: 1000;
  transition: all var(--transition-base);
  box-shadow: 0 2px 20px rgba(0,0,0,0.06);
}

.header.scrolled {
  height: 64px;
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Top bar */
.topbar {
  background: var(--gradient-primary);
  padding: var(--space-2) 0;
  font-size: var(--font-size-xs);
  color: rgba(255,255,255,0.85);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topbar a { color: rgba(255,255,255,0.85); }
.topbar a:hover { color: var(--white); }

.topbar-left, .topbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.topbar-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.topbar-item i {
  color: var(--gold);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.logo-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--white);
  box-shadow: var(--shadow-primary);
  letter-spacing: -1px;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-name {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  letter-spacing: -0.5px;
}

.logo-name span {
  color: var(--secondary);
}

.logo-tagline {
  font-size: 0.65rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 500;
}

/* Main Nav */
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-3);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--gray-700);
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background: rgba(10,36,99,0.06);
}

.nav-link i {
  font-size: 0.65rem;
  transition: transform var(--transition-base);
}

.nav-item:hover > .nav-link i {
  transform: rotate(180deg);
}

/* Dropdown */
.dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--gray-100);
  min-width: 220px;
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 100;
}

.nav-item:hover .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.dropdown-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--gray-700);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.dropdown-link:hover {
  background: rgba(10,36,99,0.06);
  color: var(--primary);
  transform: translateX(4px);
}

.dropdown-link i {
  width: 18px;
  color: var(--accent);
  font-size: 0.85rem;
}

/* Header CTA */
.header-cta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.header-search-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-600);
  transition: all var(--transition-base);
  font-size: 0.9rem;
}

.header-search-btn:hover {
  background: var(--primary);
  color: var(--white);
}

/* Mobile menu */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--space-2);
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav overlay */
.mobile-nav {
  display: none;
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 999;
}

.mobile-nav-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.5);
}

.mobile-nav-panel {
  position: absolute;
  top: 0; right: 0;
  width: min(360px, 90vw);
  height: 100%;
  background: var(--white);
  padding: var(--space-6);
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--transition-slow);
}

.mobile-nav.open .mobile-nav-panel {
  transform: translateX(0);
}

.mobile-nav.open {
  display: block;
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 2px solid var(--gray-100);
}

.mobile-nav-close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--gray-600);
}

.mobile-nav-links a {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--gray-700);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-1);
  transition: all var(--transition-base);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.mobile-nav-links a:hover {
  background: rgba(10,36,99,0.06);
  color: var(--primary);
  padding-left: var(--space-6);
}

.mobile-nav-links a i {
  width: 20px;
  color: var(--accent);
}

/* --- Breadcrumb --- */
.breadcrumb-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  padding: var(--space-10) 0;
  position: relative;
  overflow: hidden;
}

.breadcrumb-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: rgba(255,255,255,0.04);
  border-radius: 50%;
}

.breadcrumb-section::after {
  content: '';
  position: absolute;
  bottom: -60%;
  left: -5%;
  width: 300px;
  height: 300px;
  background: rgba(255,255,255,0.03);
  border-radius: 50%;
}

.breadcrumb-content {
  position: relative;
  z-index: 1;
}

.breadcrumb-content h1 {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--white);
  margin-bottom: var(--space-3);
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.breadcrumb-nav a {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.75);
  transition: color var(--transition-base);
}

.breadcrumb-nav a:hover {
  color: var(--white);
}

.breadcrumb-nav span {
  color: rgba(255,255,255,0.4);
  font-size: 0.75rem;
}

.breadcrumb-nav .current {
  color: var(--gold);
  font-weight: 500;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition-bounce);
  cursor: pointer;
  border: 2px solid transparent;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.15);
  transform: translateX(-100%);
  transition: transform 0.4s ease;
}

.btn:hover::before {
  transform: translateX(0);
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--white);
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(10,36,99,0.35);
}

.btn-secondary {
  background: var(--gradient-accent);
  color: var(--white);
  box-shadow: var(--shadow-secondary);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(230,57,70,0.40);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: var(--white);
  transform: translateY(-2px);
}

.btn-outline-white {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.6);
}

.btn-outline-white:hover {
  background: var(--white);
  color: var(--primary);
  border-color: var(--white);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-base);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-xs);
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* --- Cards --- */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: all var(--transition-base);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.card-img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: var(--gray-100);
}

.card-body {
  padding: var(--space-5);
}

.card-tag {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(10,36,99,0.08);
  color: var(--accent);
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--space-3);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--space-3);
  line-height: 1.4;
}

.card-text {
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  line-height: 1.7;
}

.card-footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* --- Stats Counter --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

.stat-item {
  text-align: center;
  padding: var(--space-8);
}

.stat-number {
  font-size: var(--font-size-5xl);
  font-weight: 900;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: var(--space-2);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* --- Back to Top --- */
#backToTop {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  color: var(--white);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  box-shadow: var(--shadow-primary);
  cursor: pointer;
  border: none;
  z-index: 500;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
}

#backToTop.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#backToTop:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(10,36,99,0.4);
}

/* --- Footer --- */
.footer {
  background: var(--primary-dark);
  color: rgba(255,255,255,0.75);
  padding-top: var(--space-16);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--space-10);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand .logo-name {
  color: var(--white);
  font-size: 1.4rem;
}

.footer-tagline {
  font-size: var(--font-size-sm);
  line-height: 1.8;
  margin: var(--space-4) 0 var(--space-5);
  opacity: 0.8;
}

.footer-social {
  display: flex;
  gap: var(--space-3);
}

.social-link {
  width: 38px;
  height: 38px;
  background: rgba(255,255,255,0.08);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.7);
  font-size: 0.9rem;
  transition: all var(--transition-base);
}

.social-link:hover {
  background: var(--secondary);
  color: var(--white);
  transform: translateY(-3px);
}

.footer-col h4 {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--white);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--secondary);
  display: inline-block;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links a {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.65);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  transition: all var(--transition-base);
  padding: var(--space-1) 0;
}

.footer-links a:hover {
  color: var(--white);
  transform: translateX(4px);
}

.footer-links a i {
  font-size: 0.65rem;
  color: var(--secondary);
}

.footer-contact-item {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  font-size: var(--font-size-sm);
  align-items: flex-start;
}

.footer-contact-item i {
  color: var(--gold);
  margin-top: 3px;
  flex-shrink: 0;
  width: 16px;
}

.footer-bottom {
  padding: var(--space-5) 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--font-size-xs);
  color: rgba(255,255,255,0.4);
}

.footer-bottom a {
  color: rgba(255,255,255,0.6);
}
.footer-bottom a:hover { color: var(--white); }

/* --- Badges & Tags --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.3px;
}

.badge-primary { background: rgba(10,36,99,0.1); color: var(--primary); }
.badge-secondary { background: rgba(230,57,70,0.1); color: var(--secondary); }
.badge-accent { background: rgba(29,132,181,0.1); color: var(--accent); }
.badge-success { background: rgba(45,106,79,0.1); color: var(--success); }
.badge-gold { background: rgba(244,162,97,0.15); color: #c47f29; }

/* --- Forms --- */
.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: var(--space-2);
}

.form-label span.required {
  color: var(--secondary);
  margin-left: 3px;
}

.form-control {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--gray-800);
  background: var(--white);
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  outline: none;
}

.form-control:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(29,132,181,0.12);
}

.form-control:hover {
  border-color: var(--gray-400);
}

.form-control.error {
  border-color: var(--secondary);
  box-shadow: 0 0 0 3px rgba(230,57,70,0.10);
}

textarea.form-control {
  resize: vertical;
  min-height: 140px;
}

/* --- Accordion --- */
.accordion-item {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
  overflow: hidden;
  transition: all var(--transition-base);
}

.accordion-item:hover {
  border-color: var(--accent);
}

.accordion-header {
  padding: var(--space-4) var(--space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  background: var(--white);
  font-weight: 600;
  color: var(--gray-800);
  transition: all var(--transition-base);
  gap: var(--space-4);
}

.accordion-header:hover {
  background: rgba(10,36,99,0.04);
  color: var(--primary);
}

.accordion-item.open .accordion-header {
  background: var(--primary);
  color: var(--white);
}

.accordion-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(10,36,99,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition-base);
  font-size: 0.8rem;
}

.accordion-item.open .accordion-icon {
  background: rgba(255,255,255,0.2);
  transform: rotate(180deg);
}

.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 var(--space-5);
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  line-height: 1.8;
}

.accordion-item.open .accordion-body {
  max-height: 600px;
  padding: var(--space-5);
}

/* --- Pagination --- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-10);
}

.page-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--gray-600);
  background: var(--white);
  border: 1px solid var(--gray-200);
  cursor: pointer;
  transition: all var(--transition-base);
}

.page-btn:hover,
.page-btn.active {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
  box-shadow: var(--shadow-primary);
}

.page-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* --- Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--white);
  border-radius: var(--radius-xl);
  max-width: 900px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.9) translateY(20px);
  transition: all var(--transition-bounce);
  box-shadow: var(--shadow-xl);
}

.modal-overlay.open .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  background: var(--white);
  z-index: 1;
}

.modal-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--primary);
}

.modal-close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  transition: all var(--transition-base);
}

.modal-close:hover {
  background: var(--secondary);
  color: var(--white);
  transform: rotate(90deg);
}

.modal-body {
  padding: var(--space-6);
}

/* --- Filter Tabs --- */
.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
}

.filter-tab {
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  border: 1.5px solid var(--gray-300);
  background: var(--white);
  color: var(--gray-600);
}

.filter-tab:hover,
.filter-tab.active {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
  box-shadow: var(--shadow-primary);
  transform: translateY(-1px);
}

/* --- Animations on scroll --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Stagger children */
.stagger > * { --stagger-delay: 0.1s; }
.stagger > *:nth-child(1) { transition-delay: 0.1s; }
.stagger > *:nth-child(2) { transition-delay: 0.2s; }
.stagger > *:nth-child(3) { transition-delay: 0.3s; }
.stagger > *:nth-child(4) { transition-delay: 0.4s; }
.stagger > *:nth-child(5) { transition-delay: 0.5s; }
.stagger > *:nth-child(6) { transition-delay: 0.6s; }

/* --- Floating animation --- */
.float {
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* --- Pulse Ring --- */
.pulse-ring {
  position: relative;
}

.pulse-ring::after {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 2px solid var(--secondary);
  animation: pulseRing 2s ease-out infinite;
}

@keyframes pulseRing {
  0% { transform: scale(1); opacity: 0.8; }
  100% { transform: scale(1.4); opacity: 0; }
}

/* --- Shimmer Loading --- */
.shimmer {
  background: linear-gradient(90deg, var(--gray-100) 25%, var(--gray-200) 50%, var(--gray-100) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* --- Section Backgrounds --- */
.bg-gray { background: var(--gray-50); }
.bg-primary { background: var(--gradient-primary); }
.bg-dark { background: var(--primary-dark); }
.bg-pattern {
  background-color: var(--gray-50);
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%230a2463' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

/* --- Alert / Notification --- */
.alert {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  border-left: 4px solid;
  margin-bottom: var(--space-4);
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--font-size-sm);
}

.alert-info { background: rgba(29,132,181,0.08); border-color: var(--accent); color: #0c5a80; }
.alert-success { background: rgba(45,106,79,0.08); border-color: var(--success); color: var(--success); }
.alert-warning { background: rgba(244,162,97,0.12); border-color: var(--gold); color: #9a6420; }
.alert-error { background: rgba(230,57,70,0.08); border-color: var(--secondary); color: #b02330; }

/* --- Tooltip --- */
[data-tooltip] {
  position: relative;
}

[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--gray-900);
  color: var(--white);
  font-size: var(--font-size-xs);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

[data-tooltip]:hover::after {
  opacity: 1;
}

/* --- Dividers --- */
.divider {
  width: 100%;
  height: 1px;
  background: var(--gray-200);
  margin: var(--space-8) 0;
}

.divider-gradient {
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

/* --- Image Placeholder (SVG-based) --- */
.img-placeholder {
  background: linear-gradient(135deg, var(--gray-200) 0%, var(--gray-300) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-500);
  font-size: 2rem;
}

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

/* Tablet */
@media (max-width: 1024px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
  }

  .container { padding: 0 var(--space-5); }

  .nav { display: none; }
  .nav-toggle { display: flex; }

  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Mobile */
@media (max-width: 640px) {
  :root {
    --font-size-5xl: 2rem;
    --font-size-4xl: 1.75rem;
    --font-size-3xl: 1.5rem;
    --space-20: 3.5rem;
    --space-24: 4rem;
    --header-height: 64px;
  }

  .container { padding: 0 var(--space-4); }

  .section { padding: var(--space-12) 0; }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .section-title h2 {
    font-size: var(--font-size-3xl);
  }

  .topbar { display: none; }

  #backToTop {
    bottom: var(--space-5);
    right: var(--space-5);
    width: 42px;
    height: 42px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-3);
    text-align: center;
  }

  .btn-lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-sm);
  }
}

/* Scrollbar Styling */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--gray-100); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* Selection */
::selection {
  background: var(--accent);
  color: var(--white);
}