:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --primary-border: #bfdbfe;
  --accent: #f59e0b;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --bg-main: #ffffff;
  --bg-alt: #f8fafc;
  --bg-sidebar: #f8fafc;
  --border-color: #e2e8f0;
  --border-subtle: #f1f5f9;
  --card-bg: #ffffff;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.04);
  --radius: 10px;
  --radius-sm: 6px;
  --sidebar-width: 290px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 85px;
}

body {
  font-family: var(--font-sans);
  color: var(--text-main);
  background-color: var(--bg-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

/* Header & Nav */
.header {
  position: sticky;
  top: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
  height: 64px;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 28px;
  max-width: 1440px;
  margin: 0 auto;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.4px;
}

.logo-badge {
  background: linear-gradient(135deg, var(--primary), #3b82f6);
  color: #fff;
  padding: 4px 9px;
  border-radius: 7px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.docs-tag {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--bg-alt);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 3px 8px;
  border-radius: 6px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.main-site-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
  border: 1px solid transparent;
}

.main-site-link:hover {
  color: var(--primary);
  background-color: var(--bg-alt);
  border-color: var(--border-color);
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  background: var(--bg-alt);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2px;
  gap: 2px;
}

.lang-btn {
  border: none;
  background: transparent;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 700;
  border-radius: 16px;
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.2s ease;
}

.lang-btn.active {
  background: #ffffff;
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.mobile-docs-toggle {
  display: none;
  background: var(--bg-alt);
  border: 1px solid var(--border-color);
  padding: 7px 12px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  align-items: center;
  gap: 6px;
}

/* Docs Shell (2-Column Layout) */
.docs-shell {
  display: flex;
  max-width: 1440px;
  margin: 0 auto;
  min-height: calc(100vh - 64px);
}

/* Docs Sidebar */
.docs-sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  padding: 28px 16px;
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow-y: auto;
}

.sidebar-group {
  margin-bottom: 28px;
}

.sidebar-heading {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-light);
  margin-bottom: 10px;
  padding: 0 12px;
}

.sidebar-menu {
  list-style: none;
}

.sidebar-item {
  margin-bottom: 2px;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.15s ease;
  line-height: 1.4;
}

.sidebar-link:hover {
  color: var(--text-main);
  background-color: rgba(0, 0, 0, 0.04);
}

.sidebar-link.active {
  color: var(--primary);
  background-color: var(--primary-light);
  font-weight: 600;
}

.sidebar-link-icon {
  font-size: 15px;
  width: 18px;
  text-align: center;
  flex-shrink: 0;
}

.sidebar-footer {
  margin-top: 36px;
  padding: 16px 12px;
  border-top: 1px solid var(--border-color);
  font-size: 12px;
  color: var(--text-muted);
}

.sidebar-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #16a34a;
  font-weight: 600;
  font-size: 12px;
  margin-bottom: 4px;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #16a34a;
}

/* Docs Main Content */
.docs-main {
  flex: 1;
  min-width: 0;
  padding: 40px 56px 80px;
  background-color: #ffffff;
}

.docs-article {
  max-width: 860px;
  margin: 0 auto;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.breadcrumb-separator {
  color: var(--text-light);
}

.breadcrumb-current {
  color: var(--text-main);
  font-weight: 600;
}

/* Document Header */
.doc-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.doc-header h1 {
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -0.6px;
  color: var(--text-main);
  margin-bottom: 12px;
  line-height: 1.25;
}

.doc-lead {
  font-size: 17px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
}

.doc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  font-size: 13px;
  color: var(--text-muted);
}

.meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: var(--bg-alt);
  border: 1px solid var(--border-color);
  padding: 3px 10px;
  border-radius: 14px;
  font-weight: 500;
}

/* Document Typography */
.doc-content h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.3px;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.doc-content h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-main);
  margin: 24px 0 10px;
}

.doc-content p {
  color: #334155;
  font-size: 15px;
  line-height: 1.75;
  margin-bottom: 16px;
}

.doc-content ul,
.doc-content ol {
  color: #334155;
  font-size: 15px;
  line-height: 1.75;
  margin-bottom: 18px;
  padding-left: 24px;
}

.doc-content li {
  margin-bottom: 8px;
}

.doc-content strong {
  color: var(--text-main);
  font-weight: 600;
}

.doc-content code {
  font-family: var(--font-mono);
  font-size: 13px;
  background-color: var(--bg-alt);
  border: 1px solid var(--border-color);
  padding: 2px 6px;
  border-radius: 4px;
  color: #e11d48;
}

/* Callouts / Alerts */
.doc-alert {
  background-color: var(--primary-light);
  border-left: 4px solid var(--primary);
  border-radius: 4px 8px 8px 4px;
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 14px;
  color: #1e3a8a;
  line-height: 1.65;
}

.doc-alert strong {
  color: #1e3a8a;
}

.doc-alert-warning {
  background-color: #fffbeb;
  border-left-color: #f59e0b;
  color: #92400e;
}

.doc-alert-warning strong {
  color: #92400e;
}

.doc-alert-success {
  background-color: #f0fdf4;
  border-left-color: #16a34a;
  color: #166534;
}

.doc-alert-success strong {
  color: #166534;
}

/* Overview Hub Cards Grid */
.docs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin: 32px 0 40px;
}

.doc-card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  transition: all 0.2s ease;
  position: relative;
}

.doc-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.doc-card-icon {
  font-size: 26px;
  margin-bottom: 14px;
}

.doc-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.doc-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 16px;
  flex-grow: 1;
}

.doc-card-link {
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* Compliance Info Box */
.compliance-box {
  background-color: var(--bg-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin: 32px 0;
}

.compliance-box h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.compliance-list {
  list-style: none;
  padding-left: 0 !important;
}

.compliance-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: #334155;
  margin-bottom: 10px;
}

.compliance-list li:last-child {
  margin-bottom: 0;
}

.compliance-icon {
  color: #16a34a;
  font-weight: bold;
}

/* FAQ Accordion */
.faq-list {
  margin: 24px 0;
}

.faq-item {
  border-bottom: 1px solid var(--border-color);
  padding: 18px 0;
}

.faq-question {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-answer {
  margin-top: 10px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.65;
}

/* Contact Cards */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 24px 0;
}

.contact-box {
  padding: 24px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-alt);
}

.contact-box h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.contact-box p {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 12px;
}

/* Footer */
.docs-footer {
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
  margin-top: 60px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-light);
}

.docs-footer-links {
  display: flex;
  gap: 16px;
  list-style: none;
}

.docs-footer-links a {
  color: var(--text-muted);
}

.docs-footer-links a:hover {
  color: var(--primary);
}

/* Multi-language Display Toggle */
[data-lang="tr"] {
  display: none;
}

body.lang-tr [data-lang="de"] {
  display: none !important;
}

body.lang-tr [data-lang="tr"] {
  display: block !important;
}

body.lang-tr span[data-lang="tr"],
body.lang-tr strong[data-lang="tr"],
body.lang-tr a[data-lang="tr"],
body.lang-tr code[data-lang="tr"] {
  display: inline !important;
}

body.lang-de [data-lang="tr"] {
  display: none !important;
}

body.lang-de [data-lang="de"] {
  display: block !important;
}

body.lang-de span[data-lang="de"],
body.lang-de strong[data-lang="de"],
body.lang-de a[data-lang="de"],
body.lang-de code[data-lang="de"] {
  display: inline !important;
}

/* Responsive */
@media (max-width: 960px) {
  .mobile-docs-toggle {
    display: inline-flex;
  }

  .docs-sidebar {
    position: fixed;
    top: 64px;
    left: -100%;
    width: 280px;
    height: calc(100vh - 64px);
    background: #ffffff;
    z-index: 99;
    box-shadow: var(--shadow-lg);
    transition: left 0.25s ease;
  }

  .docs-sidebar.open {
    left: 0;
  }

  .docs-main {
    padding: 28px 20px 60px;
  }

  .docs-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .docs-footer {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}