/* ===== CSS Variables & Design Tokens ===== */
:root {
  --primary: #1a3c6e;
  --primary-light: #2a5ba8;
  --primary-dark: #0f2847;
  --accent: #e8a838;
  --accent-light: #f0c060;
  --accent-dark: #c88a20;
  --bg: #f4f6fb;
  --bg-dark: #0d1b2a;
  --surface: #ffffff;
  --surface-glass: rgba(255, 255, 255, 0.75);
  --text: #1a1a2e;
  --text-secondary: #5a6a80;
  --text-light: #f0f0f5;
  --border: #e0e4ec;
  --shadow-sm: 0 2px 8px rgba(26, 60, 110, 0.08);
  --shadow-md: 0 8px 30px rgba(26, 60, 110, 0.12);
  --shadow-lg: 0 16px 50px rgba(26, 60, 110, 0.18);
  --shadow-accent: 0 8px 30px rgba(232, 168, 56, 0.25);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --max-width: 1200px;
}

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

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  color: var(--accent);
}

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

ul, ol {
  padding-left: 1.5em;
}

/* ===== Typography ===== */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--primary-dark);
}

h1 { font-size: clamp(1.8rem, 4vw, 3rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: clamp(1.15rem, 2.5vw, 1.5rem); }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.1rem;
  font-weight: 900;
  box-shadow: 0 4px 12px rgba(26, 60, 110, 0.3);
}

/* Navigation */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  padding: 0;
}

.nav-menu a {
  display: block;
  padding: 8px 18px;
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
  border-radius: var(--radius-xs);
  transition: all var(--transition);
  position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--primary);
  background: rgba(26, 60, 110, 0.06);
}

.nav-menu a.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 18px;
  right: 18px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  background: var(--bg);
  border-radius: 50px;
  padding: 3px;
  gap: 2px;
  border: 1px solid var(--border);
}

.lang-btn {
  border: none;
  background: transparent;
  padding: 6px 12px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  border-radius: 50px;
  transition: all var(--transition);
  color: var(--text-secondary);
  font-family: var(--font);
  letter-spacing: 0.03em;
}

.lang-btn.active {
  background: var(--primary);
  color: white;
  box-shadow: 0 2px 8px rgba(26, 60, 110, 0.3);
}

.lang-btn:hover:not(.active) {
  color: var(--primary);
  background: rgba(26, 60, 110, 0.06);
}

/* Burger Menu */
.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  border: none;
  background: none;
  z-index: 1010;
}

.burger span {
  display: block;
  width: 24px;
  height: 2.5px;
  background: var(--primary);
  border-radius: 3px;
  transition: all var(--transition);
  transform-origin: center;
}

.burger.open span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.burger.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.burger.open span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* ===== Hero Section ===== */
.hero {
  position: relative;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 40%, var(--primary-light) 100%);
  color: white;
  padding: 100px 24px 90px;
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(232, 168, 56, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 8s ease-in-out infinite;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(42, 91, 168, 0.2) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -20px) scale(1.05); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  padding: 6px 20px;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 24px;
  letter-spacing: 0.04em;
  color: var(--accent-light);
}

.hero h1 {
  color: white;
  margin-bottom: 20px;
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.hero p {
  font-size: clamp(1rem, 2vw, 1.25rem);
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.8;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 36px;
  background: var(--accent);
  color: var(--primary-dark);
  font-weight: 700;
  font-size: 1rem;
  border-radius: 50px;
  transition: all var(--transition);
  box-shadow: var(--shadow-accent);
  text-decoration: none;
}

.hero-cta:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(232, 168, 56, 0.35);
  color: var(--primary-dark);
}

/* ===== Advantages Section ===== */
.advantages {
  padding: 80px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-title {
  text-align: center;
  margin-bottom: 16px;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 50px;
  font-size: 1.05rem;
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.advantage-card {
  text-align: center;
  padding: 32px 20px;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.advantage-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.advantage-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 18px;
  background: linear-gradient(135deg, rgba(26, 60, 110, 0.08), rgba(42, 91, 168, 0.12));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: var(--primary);
}

.advantage-card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.advantage-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== Cards Section ===== */
.cards-section {
  padding: 40px 24px 90px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.card {
  position: relative;
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
}

.card:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.card-visual {
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  position: relative;
  overflow: hidden;
}

.card-visual::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.08;
}

.card:nth-child(1) .card-visual {
  background: linear-gradient(135deg, #1a3c6e, #2a5ba8);
  color: white;
}

.card:nth-child(2) .card-visual {
  background: linear-gradient(135deg, #0f5132, #198754);
  color: white;
}

.card:nth-child(3) .card-visual {
  background: linear-gradient(135deg, #6f2dbd, #9b59b6);
  color: white;
}

.card:nth-child(4) .card-visual {
  background: linear-gradient(135deg, #c85a20, #e8a838);
  color: white;
}

.card:nth-child(5) .card-visual {
  background: linear-gradient(135deg, #0d7377, #14a3a8);
  color: white;
}

.card:nth-child(6) .card-visual {
  background: linear-gradient(135deg, #d32f2f, #ef5350);
  color: white;
}

.card:nth-child(7) .card-visual {
  background: linear-gradient(135deg, #00695c, #26a69a);
  color: white;
}

/* Base table styles for articles */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin-bottom: 24px;
}
.article-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}
.article-content th, .article-content td {
  padding: 12px 16px;
  border: 1px solid var(--border);
  text-align: left;
}
.article-content th {
  background-color: rgba(26, 60, 110, 0.05);
  color: var(--primary-dark);
  font-weight: 600;
}
.article-content td {
  color: var(--text);
}
.article-content tr.table-total td {
  background-color: rgba(232, 168, 56, 0.1);
  color: var(--primary-dark);
}
.text-muted {
  font-size: 0.9rem !important;
  color: var(--text-secondary) !important;
}

.card-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-body h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
  color: var(--primary-dark);
}

.card-body p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
}

.card-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  color: var(--primary-light);
  font-weight: 600;
  font-size: 0.9rem;
  transition: all var(--transition);
}

.card:hover .card-arrow {
  gap: 10px;
  color: var(--accent-dark);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--primary-dark);
  color: var(--text-light);
  padding: 60px 24px 30px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer-col h4 {
  color: var(--accent-light);
  margin-bottom: 16px;
  font-size: 1rem;
  font-weight: 600;
}

.footer-col p,
.footer-col li {
  font-size: 0.9rem;
  opacity: 0.8;
  line-height: 1.8;
}

.footer-col ul {
  list-style: none;
  padding: 0;
}

.footer-col ul a {
  color: var(--text-light);
  opacity: 0.8;
  transition: all var(--transition);
}

.footer-col ul a:hover {
  opacity: 1;
  color: var(--accent-light);
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  font-size: 0.85rem;
  opacity: 0.6;
}

/* ===== Article Pages ===== */
.breadcrumbs {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 24px 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumbs a {
  color: var(--primary-light);
  font-weight: 500;
}

.breadcrumbs span {
  color: var(--text-secondary);
}

.article-hero {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: white;
  padding: 60px 24px 50px;
  text-align: center;
}

.article-hero h1 {
  color: white;
  max-width: 700px;
  margin: 0 auto;
}

.article-hero .hero-badge {
  margin-bottom: 16px;
}

.article-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 50px 24px 80px;
}

.article-content h2 {
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border);
}

.article-content h3 {
  margin-top: 28px;
  margin-bottom: 12px;
}

.article-content p {
  margin-bottom: 16px;
  color: var(--text);
  font-size: 1.02rem;
}

.article-content ul,
.article-content ol {
  margin-bottom: 16px;
}

.article-content li {
  margin-bottom: 8px;
  font-size: 1rem;
}

.article-content .info-box {
  background: linear-gradient(135deg, rgba(26, 60, 110, 0.05), rgba(42, 91, 168, 0.08));
  border-left: 4px solid var(--primary);
  padding: 20px 24px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
}

.article-content .info-box p {
  margin-bottom: 0;
  font-weight: 500;
  color: var(--primary-dark);
}

/* Related Articles */
.related-articles {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.related-articles h2 {
  margin-bottom: 24px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.related-card {
  display: block;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  text-decoration: none;
}

.related-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.related-card h4 {
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: 6px;
}

.related-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ===== Mobile Overlay ===== */
.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 999;
  opacity: 0;
  transition: opacity var(--transition);
}

.mobile-overlay.show {
  opacity: 1;
}

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */

/* Tablet */
@media (max-width: 1024px) {
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

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

/* Mobile */
@media (max-width: 768px) {
  .burger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--surface);
    flex-direction: column;
    padding: 90px 24px 40px;
    gap: 4px;
    z-index: 1005;
    box-shadow: var(--shadow-lg);
    transition: right var(--transition);
    align-items: stretch;
  }

  .nav-menu.open {
    right: 0;
  }

  .nav-menu a {
    padding: 14px 18px;
    font-size: 1.05rem;
    border-radius: var(--radius-xs);
  }

  .mobile-overlay.show {
    display: block;
    opacity: 1;
  }

  .hero {
    padding: 70px 20px 60px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

@media (max-width: 480px) {
  .header-inner {
    height: 60px;
    padding: 0 16px;
  }

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

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

  .hero {
    padding: 50px 16px 45px;
  }

  .advantages {
    padding: 50px 16px;
  }

  .cards-section {
    padding: 20px 16px 60px;
  }

  .article-content {
    padding: 30px 16px 60px;
  }

  .lang-btn {
    padding: 5px 12px;
    font-size: 0.8rem;
  }
}