*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --black: #000000;
  --white: #ffffff;
  --blue:  #1e40af;
  --gray1: #f3f4f6;
  --gray2: #e5e7eb;
}
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--white);
  color: var(--black);
  line-height: 1.6;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 900px; margin: 0 auto; padding: 0 24px; }

.header {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 24px 0;
}
.brand { font-size: 1.75rem; font-weight: 800; }
.lang-select {
  display: flex; gap: 8px; background: var(--gray1);
  padding: 4px; border-radius: 8px;
}
.lang-btn {
  padding: 6px 14px; font-size: .85rem; font-weight: 600;
  border: none; border-radius: 6px; background: transparent;
  cursor: pointer; color: var(--black); transition: all .2s;
}
.lang-btn.active { background: var(--white); box-shadow: 0 1px 3px rgba(0,0,0,.1); }
.brand { display: flex; flex-direction: column; align-items: center; gap: 12px; }
.user-actions { display: flex; gap: 8px; align-items: center; }
.user-btn { padding: 6px 12px; font-size: .75rem; border-radius: 6px; display: flex; align-items: center; gap: 6px; }
.user-btn svg { width: 16px; height: 16px; fill: currentColor; }

.intro { padding: 48px 0 32px; text-align: center; }
.intro h1 { font-size: 2.5rem; font-weight: 800; line-height: 1.2; margin-bottom: 16px; }
.intro p { font-size: 1.1rem; color: #4b5563; max-width: 600px; margin: 0 auto; }

.main-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 40px; }
.main-full { grid-column: 1 / -1; }
.notebook { width: 100%; }
.news-col h2 { font-size: 1.75rem; font-weight: 800; border-bottom: 2px solid var(--black); padding-bottom: 12px; margin-bottom: 24px; }
.news-item { margin-bottom: 32px; padding-bottom: 24px; border-bottom: 1px solid var(--gray2); }
.news-date { font-size: .75rem; color: #9ca3af; text-transform: uppercase; letter-spacing: .05em; margin-bottom: 8px; }
.news-item h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 10px; line-height: 1.3; }
.news-item p { font-size: 1rem; color: #4b5563; line-height: 1.6; }
.news-tag {
  display: inline-block; font-size: .75rem; font-weight: 600;
  color: var(--blue); text-transform: uppercase; letter-spacing: .04em;
  border: 1px solid var(--blue); padding: 4px 10px; border-radius: 20px; margin-top: 10px;
}

.sidebar-col { position: sticky; top: 20px; height: fit-content; }
.login-panel { background: var(--gray1); padding: 32px; border-radius: 16px; border: 1px solid var(--gray2); }
.newsletter-panel { background: var(--gray1); padding: 32px; border-radius: 16px; border: 1px solid var(--gray2); }
.notebook { background: var(--white); border-radius: 16px; overflow: hidden; box-shadow: 0 4px 12px rgba(0,0,0,.1); grid-column: 1 / -1; width: 100%; }
.newsletter-panel h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 20px; padding-bottom: 10px; border-bottom: 1px solid var(--gray2); }
.notebook .tabs { display: flex; border-bottom: 2px solid var(--gray2); }
.notebook .tab { flex: 1; padding: 14px; text-align: center; font-weight: 600; cursor: pointer; border: none; background: #f9fafb; color: #6b7280; }
.notebook .tab.active { background: var(--white); color: var(--black); border-bottom: 3px solid var(--blue); }
.notebook .tab-content { padding: 24px; min-height: 200px; }
.notebook .hidden { display: none; }
.user-search { margin-bottom: 20px; }
.user-search input { width: 100%; padding: 10px; border: 1px solid var(--gray2); border-radius: 8px; font-size: 1rem; outline: none; }
.user-search input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(30,64,175,.1); }
.users-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.user-card { background: var(--white); border: 1px solid var(--gray2); border-radius: 12px; padding: 20px; display: flex; align-items: flex-start; gap: 16px; }
.user-avatar { width: 48px; height: 48px; border-radius: 50%; background: var(--blue); color: var(--white); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 1.2rem; flex-shrink: 0; overflow: hidden; }
.user-avatar-img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; }
.user-avatar-text { display: flex; align-items: center; justify-content: center; width: 100%; height: 100%; }
.user-info h4 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.user-company { font-size: .9rem; color: #6b7280; margin: 0; }
.user-email { font-size: .9rem; margin: 0; }
.user-email a { font-size: .9rem; color: #2563eb; text-decoration: none; }
.user-email a:hover { text-decoration: underline; }
.user-homepage { font-size: .9rem; margin: 0; }
.user-homepage a { font-size: .9rem; color: #2563eb; text-decoration: none; }
.user-homepage a:hover { text-decoration: underline; }
.user-location { font-size: .85rem; color: #6b7280; margin: 4px 0 0 0; }
.user-description { font-size: .85rem; color: #4b5563; margin: 8px 0 0 0; max-height: 40px; overflow: hidden; text-overflow: ellipsis; }
.wiki-accordion { margin: 24px 0; }
.wiki-topic { margin-bottom: 16px; }
.wiki-topic h4 { font-size: 1.1rem; font-weight: 600; padding: 12px 16px; background: var(--gray1); border-radius: 8px; cursor: pointer; transition: background .2s; }
.wiki-topic h4:hover { background: var(--gray2); }
.wiki-subtopics { padding-left: 24px; margin-top: 8px; }
.wiki-subtopics.hidden { display: none; }
.wiki-subtopic { margin-left: 24px; border-left: 2px solid var(--gray2); padding-left: 16px; }
.wiki-subtopic.hidden { display: none; }
.wiki-subtopic-title { font-weight: 600; padding: 8px 0; cursor: pointer; }
.wiki-subtopic-title:hover { color: var(--blue); }
.wiki-subtopic-content { padding: 12px 16px; background: var(--gray1); border-radius: 8px; margin-top: 8px; }
.user-actions { display: flex; gap: 12px; align-items: center; }
.user-btn { padding: 8px 16px; font-size: .85rem; }
.modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,.5); z-index: 999; display: flex; align-items: center; justify-content: center; }
.modal.hidden { display: none; }
.modal-content { background: var(--white); padding: 32px; border-radius: 16px; width: 90%; max-width: 800px; position: relative; box-shadow: 0 10px 30px rgba(0,0,0,.2); }
.user-detail-modal { max-width: 600px; }
.user-detail-header { display: flex; align-items: center; gap: 20px; margin-bottom: 24px; }
.user-detail-avatar { width: 80px; height: 80px; border-radius: 50%; background: var(--blue); color: var(--white); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.user-detail-avatar .user-avatar-text { font-size: 2rem; font-weight: 700; }
.user-detail-header h2 { font-size: 1.5rem; font-weight: 700; margin: 0 0 4px 0; }
.user-detail-header p { font-size: 1rem; color: #6b7280; margin: 0; }
.detail-row { display: flex; justify-content: space-between; align-items: flex-start; padding: 12px 0; border-bottom: 1px solid var(--gray2); }
.detail-row:last-child { border-bottom: none; }
.detail-label { font-weight: 600; font-size: .9rem; color: #4b5563; }
.detail-value { font-size: .9rem; color: #1f2937; text-align: right; max-width: 60%; word-break: break-word; }
.detail-value-user-desc { font-size: .9rem; color: #1f2937; text-align: left; max-width: 100%; word-break: break-word; line-height: 1.6; }
.modal-content h3 { margin-bottom: 24px; }
.close-btn { position: absolute; top: 16px; right: 20px; font-size: 24px; cursor: pointer; color: #6b7280; }
.username-display { padding: 12px 0; font-size: 1.1rem; font-weight: 700; color: var(--black); }
.profile-form .hidden { display: none; }
.form-group label { font-weight: 400; }
.login-panel h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 20px; padding-bottom: 10px; border-bottom: 1px solid var(--gray2); }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: .85rem; font-weight: 600; margin-bottom: 6px; }
.form-group input {
  width: 100%; padding: 12px; border: 1px solid var(--gray2); border-radius: 8px;
  font-size: 1rem; outline: none; transition: border-color .2s;
}
.form-group input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(30,64,175,.1); }
.btn-primary { width: 100%; padding: 12px; background: var(--black); color: var(--white); border: none; border-radius: 8px; font-size: 1rem; font-weight: 600; cursor: pointer; transition: background .2s; }
.btn-primary:hover { background: var(--blue); }
.btn-secondary { width: 100%; padding: 10px; background: var(--gray1); border: 1px solid var(--gray2); border-radius: 8px; font-size: .9rem; font-weight: 600; cursor: pointer; margin-top: 12px; }
.btn-secondary:hover { background: #e5e7eb; }
.hidden { display: none; }
.success-msg { padding: 12px; background: #d1fae5; border: 1px solid #34d399; border-radius: 8px; color: #065f46; margin-bottom: 16px; text-align: center; }

.footer { margin-top: 64px; padding-top: 32px; border-top: 2px solid var(--black); text-align: center; font-size: 1rem; white-space: nowrap; }
.footer a { font-weight: 600; text-decoration: none; }
.footer a:hover { text-decoration: underline; }

@media (max-width: 768px) {
  .main-grid { grid-template-columns: 1fr; }
  .sidebar-col { position: static; }
  .brand { font-size: 1.4rem; }
  .header { flex-direction: column; gap: 12px; }
}

.hide-de { display: none; }
.hide-en { display: none; }
[data-lang="de"] .hide-de { display: block; }
[data-lang="en"] .hide-en { display: block; }
[data-lang="de"] .hide-en { display: none; }
[data-lang="en"] .hide-de { display: none; }