/* Kazan Venture Fair - Official Theme Stylesheet */
:root {
  --color-primary: #0F2B48;
  --color-primary-dark: #081B30;
  --color-primary-light: #16436E;
  --color-accent: #009FE3;
  --color-accent-hover: #0087C2;
  --color-cta: #F59E0B;
  --color-cta-hover: #D97706;
  --color-dark: #1E293B;
  --color-muted: #64748B;
  --color-light: #F8FAFC;
  --color-card-border: #E2E8F0;
  --color-white: #FFFFFF;
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --container-max: 1240px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(15, 43, 72, 0.08);
  --shadow-lg: 0 10px 25px rgba(15, 43, 72, 0.12);
  --transition: all 0.25s ease-in-out;
}

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

html {
  font-family: var(--font-base);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-dark);
  background-color: var(--color-white);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

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

a:hover, a:focus {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-primary);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 0.75rem;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; margin-top: 1.5rem; }
h3 { font-size: 1.35rem; margin-top: 1.25rem; }
h4 { font-size: 1.15rem; }

p {
  margin-bottom: 1.2rem;
  color: #334155;
}

ul, ol {
  margin-bottom: 1.2rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.4rem;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Header & Navigation */
.site-header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-card-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 0;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.site-logo img {
  width: 320px;
  height: 48px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 1.1rem;
  align-items: center;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.35rem 0.2rem;
  border-bottom: 2px solid transparent;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  text-decoration: none;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.lang-switch {
  display: flex;
  align-items: center;
  background: var(--color-light);
  border-radius: 20px;
  padding: 0.2rem 0.5rem;
  font-size: 0.85rem;
  font-weight: 700;
  border: 1px solid var(--color-card-border);
}

.lang-switch a {
  color: var(--color-muted);
  padding: 0.15rem 0.4rem;
  border-radius: 12px;
}

.lang-switch a.active {
  color: var(--color-white);
  background: var(--color-primary);
  text-decoration: none;
}

.nav-burger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  width: 44px;
  height: 44px;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
}

.nav-burger span {
  display: block;
  width: 24px;
  height: 2.5px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.95rem;
  text-align: center;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none !important;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white) !important;
}

.btn-primary:hover {
  background: var(--color-primary-light);
}

.btn-accent {
  background: var(--color-accent);
  color: var(--color-white) !important;
}

.btn-accent:hover {
  background: var(--color-accent-hover);
}

.btn-cta {
  background: var(--color-cta);
  color: var(--color-primary-dark) !important;
  box-shadow: 0 4px 10px rgba(245, 158, 11, 0.3);
}

.btn-cta:hover {
  background: var(--color-cta-hover);
  color: var(--color-white) !important;
}

.btn-outline {
  border: 1.5px solid var(--color-primary);
  color: var(--color-primary) !important;
  background: transparent;
}

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

/* Breadcrumbs */
.breadcrumb-wrapper {
  background: var(--color-light);
  border-bottom: 1px solid var(--color-card-border);
  padding: 0.75rem 0;
  font-size: 0.88rem;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  gap: 0.5rem;
  align-items: center;
  margin: 0;
  padding: 0;
}

.breadcrumb-list li + li::before {
  content: "/";
  color: var(--color-muted);
  margin-right: 0.5rem;
}

.breadcrumb-list a {
  color: var(--color-muted);
}

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

.breadcrumb-list .current {
  color: var(--color-primary);
  font-weight: 600;
}

/* Hero Section */
.hero {
  position: relative;
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: var(--color-white);
  padding: 3.5rem 0;
  overflow: hidden;
}

.hero-content {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2.5rem;
  align-items: center;
}

.hero-text h1 {
  color: var(--color-white);
  font-size: 2.75rem;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.hero-tag {
  display: inline-block;
  background: rgba(0, 159, 227, 0.2);
  color: #38BDF8;
  border: 1px solid rgba(0, 159, 227, 0.4);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 1rem;
}

.hero-desc {
  font-size: 1.15rem;
  color: #E2E8F0;
  margin-bottom: 1.75rem;
  max-width: 600px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 2rem;
  background: rgba(255, 255, 255, 0.08);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.meta-item {
  display: flex;
  flex-direction: column;
}

.meta-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #94A3B8;
}

.meta-value {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-white);
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 2px solid rgba(255, 255, 255, 0.15);
}

/* Sections */
.section {
  padding: 3.5rem 0;
}

.section-bg-light {
  background: var(--color-light);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 2.5rem;
}

.section-subtitle {
  color: var(--color-accent);
  text-transform: uppercase;
  font-weight: 700;
  font-size: 0.88rem;
  letter-spacing: 1.5px;
  margin-bottom: 0.4rem;
}

/* Stats Counter Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.stat-card {
  background: var(--color-white);
  padding: 2rem 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-card-border);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: var(--transition);
}

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

.stat-number {
  font-size: 2.75rem;
  font-weight: 900;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-number span {
  color: var(--color-accent);
}

.stat-label {
  font-size: 0.95rem;
  color: var(--color-muted);
  font-weight: 600;
}

/* Card Grids */
.cards-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

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

.cards-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

/* Feature & Track Cards */
.feature-card {
  background: var(--color-white);
  padding: 1.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-card-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(0, 159, 227, 0.12);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

/* Speaker Cards */
.speaker-card {
  background: var(--color-white);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

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

.speaker-avatar-wrap {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-weight: 800;
  font-size: 1.5rem;
  margin-bottom: 1rem;
  border: 3px solid var(--color-white);
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

.speaker-name {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 0.35rem;
}

.speaker-role {
  font-size: 0.88rem;
  color: var(--color-muted);
  line-height: 1.4;
}

/* News Cards */
.news-card {
  background: var(--color-white);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

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

.news-date {
  font-size: 0.82rem;
  color: var(--color-accent);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.news-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.news-snippet {
  font-size: 0.92rem;
  color: #475569;
  flex-grow: 1;
  margin-bottom: 1rem;
}

/* Partners Grid */
.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.partner-card {
  background: var(--color-white);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.partner-card img {
  width: 200px;
  height: 60px;
  object-fit: contain;
}

.partner-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

/* Tables & Program */
.program-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin: 1.5rem 0;
}

.program-table th {
  background: var(--color-primary);
  color: var(--color-white);
  text-align: left;
  padding: 1rem 1.25rem;
  font-weight: 700;
  font-size: 0.95rem;
}

.program-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-card-border);
  vertical-align: top;
  font-size: 0.95rem;
}

.program-table tr:last-child td {
  border-bottom: none;
}

.program-table tr:hover td {
  background: #F1F5F9;
}

.time-col {
  width: 140px;
  font-weight: 700;
  color: var(--color-accent);
}

/* Forms */
.form-card {
  background: var(--color-white);
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-card-border);
  box-shadow: var(--shadow-md);
  max-width: 760px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: var(--color-primary);
  font-size: 0.92rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.95rem;
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(0, 159, 227, 0.15);
}

/* FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

.faq-item {
  background: var(--color-white);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 1.25rem 1.5rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}

.faq-question:hover {
  background: var(--color-light);
}

.faq-answer {
  padding: 0 1.5rem 1.25rem;
  display: none;
  color: #475569;
}

.faq-item.active .faq-answer {
  display: block;
}

/* Footer */
.site-footer {
  background: var(--color-primary-dark);
  color: #94A3B8;
  margin-top: auto;
  padding: 3.5rem 0 1.5rem;
  border-top: 4px solid var(--color-accent);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer-col h4 {
  color: var(--color-white);
  font-size: 1.05rem;
  margin-bottom: 1rem;
  letter-spacing: 0.5px;
}

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

.footer-col li {
  margin-bottom: 0.5rem;
}

.footer-col a {
  color: #94A3B8;
}

.footer-col a:hover {
  color: var(--color-white);
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Media Queries (Breakpoints) */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-text h1 {
    font-size: 2.25rem;
  }
  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-meta {
    justify-content: center;
  }
  .hero-buttons {
    justify-content: center;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .cards-grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .cards-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-burger {
    display: flex;
  }
  .main-nav {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: var(--color-white);
    flex-direction: column;
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    border-bottom: 2px solid var(--color-accent);
    transform: translateY(-150%);
    transition: transform 0.3s ease;
    z-index: 999;
  }
  .main-nav.open {
    transform: translateY(0);
  }
  .nav-links {
    flex-direction: column;
    width: 100%;
    gap: 0.75rem;
  }
  .nav-links a {
    display: block;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--color-card-border);
  }
  .nav-actions {
    width: 100%;
    justify-content: space-between;
    margin-top: 1rem;
  }
  .site-logo img {
    width: 240px;
    height: 38px;
  }
  .cards-grid-3,
  .cards-grid-2,
  .cards-grid-4 {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero-text h1 {
    font-size: 1.85rem;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}