/* ==============================================
   zahnarztpraxis.ch – Modern Dental Health Portal
   Swiss medical information design system
   Fonts: Libre Franklin (headings) + Open Sans (body)
   Palette: Medical blue + fresh mint accent
   ============================================== */

/* --- Design Tokens --- */
:root {
  --color-primary: #0077b6;
  --color-primary-dark: #005a8c;
  --color-primary-light: #00a8e8;
  --color-accent: #06d6a0;
  --color-accent-dark: #05b384;
  --color-bg: #f8fafb;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-muted: #6b7280;
  --color-border: #d1e3ed;
  --color-border-light: #e8f1f6;
  --color-banner: #edf5fa;
  --color-footer-bg: #0a2540;
  --color-footer-text: rgba(255, 255, 255, 0.75);
  --font-heading: 'Libre Franklin', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1160px;
  --content-width: 720px;
  --sidebar-width: 280px;
  --radius: 6px;
  --radius-lg: 10px;
  --shadow-sm: 0 1px 3px rgba(0, 42, 76, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 42, 76, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 42, 76, 0.1);
  --transition: 0.2s ease;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); }

/* --- Skip link --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--color-primary);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  z-index: 9999;
  font-size: 0.875rem;
}
.skip-link:focus { top: 1rem; }

/* --- Layout --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ======================
   HEADER
   ====================== */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--color-text);
}

.logo-icon {
  font-size: 1.75rem;
  line-height: 1;
}

.logo-text-group {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.logo-title strong {
  font-weight: 800;
  color: var(--color-primary);
}

.logo-tagline {
  font-size: 0.68rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 500;
}

/* --- Navigation --- */
.nav-list {
  list-style: none;
  display: flex;
  gap: 0.15rem;
  align-items: center;
}

.site-nav a {
  display: inline-block;
  padding: 0.45rem 0.8rem;
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}

.site-nav a:hover {
  color: var(--color-primary);
  background: var(--color-banner);
}

.site-nav a.active {
  color: var(--color-primary);
  background: var(--color-banner);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 8px 10px;
  flex-direction: column;
  gap: 4px;
}

.hamburger-line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: var(--transition);
}

/* ======================
   HERO (Homepage)
   ====================== */
.hero {
  position: relative;
  overflow: hidden;
  padding: 5rem 0 4.5rem;
  background: linear-gradient(145deg, #004e78 0%, var(--color-primary) 40%, var(--color-primary-light) 100%);
  color: #fff;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 80%, rgba(6, 214, 160, 0.15) 0%, transparent 70%),
    radial-gradient(ellipse 60% 50% at 85% 20%, rgba(0, 168, 232, 0.2) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  text-align: center;
  max-width: 740px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 0.3rem 1rem;
  border-radius: 50px;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-family: var(--font-heading);
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: 1.25rem;
}

.hero-lead {
  font-size: 1.1rem;
  line-height: 1.7;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius);
  text-decoration: none;
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--color-accent);
  color: #0a2540;
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  color: #0a2540;
  box-shadow: 0 4px 14px rgba(6, 214, 160, 0.3);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.4);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.7);
  color: #fff;
}

.btn-small {
  font-size: 0.8rem;
  padding: 0.45rem 1rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius);
}

.btn-small:hover {
  background: var(--color-primary-dark);
  color: #fff;
}

/* ======================
   HOME SECTIONS
   ====================== */
.home-sections {
  padding: 4rem 0 5rem;
}

.section-intro {
  text-align: center;
  max-width: 560px;
  margin: 0 auto 2.5rem;
}

.section-intro h2 {
  font-family: var(--font-heading);
  font-size: 1.9rem;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
  margin-bottom: 0.6rem;
}

.section-intro p {
  color: var(--color-text-muted);
  font-size: 1.02rem;
  line-height: 1.65;
}

/* --- Cards --- */
.card-grid {
  display: grid;
  gap: 1.25rem;
  margin-top: 1.5rem;
}

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

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  text-decoration: none;
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  display: flex;
  flex-direction: column;
}

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

.card-icon {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
  display: block;
}

.card h2, .card h3 {
  font-family: var(--font-heading);
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.card p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  flex: 1;
}

.card-link {
  display: inline-block;
  margin-top: 0.85rem;
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-primary);
  transition: color var(--transition);
}

.card:hover .card-link { color: var(--color-primary-dark); }

.card--feature {
  border-top: 3px solid var(--color-primary);
}

.card--feature:hover {
  border-top-color: var(--color-accent);
}

.card--list {
  border-left: 3px solid var(--color-border);
}

.card--list:hover {
  border-left-color: var(--color-primary);
}

/* --- Home content block --- */
.home-content {
  max-width: var(--content-width);
  margin: 3rem auto 0;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.75;
}

.home-content h2 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 2rem 0 0.75rem;
}

/* --- Trust bar --- */
.trust-bar {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  margin-top: 3.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--color-border);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.trust-icon { font-size: 1.15rem; }

/* ======================
   PAGE BANNER (List + Single)
   ====================== */
.page-banner {
  background: var(--color-banner);
  border-bottom: 1px solid var(--color-border);
  padding: 2rem 0 2.25rem;
}

.page-banner h1 {
  font-family: var(--font-heading);
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-top: 0.25rem;
}

.page-lead {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  margin-top: 0.6rem;
  max-width: 640px;
  line-height: 1.65;
}

/* --- Breadcrumb --- */
.breadcrumb { margin-bottom: 0.75rem; }

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem;
  font-size: 0.82rem;
}

.breadcrumb li { display: flex; align-items: center; }

.breadcrumb li:not(:last-child)::after {
  content: '/';
  margin: 0 0.4rem;
  color: var(--color-text-muted);
  opacity: 0.4;
}

.breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
}

.breadcrumb a:hover { text-decoration: underline; }

.breadcrumb li:last-child { color: var(--color-text-muted); }

/* ======================
   SINGLE PAGE – Two-column layout
   ====================== */
.page-single {
  padding: 2.5rem 0 4rem;
}

.content-layout {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: 3rem;
  align-items: start;
}

/* --- Main content column --- */
.content-main {
  min-width: 0;
}

/* --- Table of Contents --- */
.toc {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: 2rem;
  overflow: hidden;
}

.toc-header {
  background: var(--color-banner);
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

.toc-header h3 {
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
}

.toc-body {
  padding: 0.75rem 1.25rem;
}

.toc-body nav ul { list-style: none; }
.toc-body nav li { margin: 0.2rem 0; }
.toc-body nav a {
  color: var(--color-text-muted);
  font-size: 0.88rem;
  text-decoration: none;
  transition: color var(--transition);
}
.toc-body nav a:hover { color: var(--color-primary); }
.toc-body nav ul ul { padding-left: 1rem; }

/* --- Page content typography --- */
.page-content h2 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 2.5rem 0 0.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border-light);
  letter-spacing: -0.015em;
  line-height: 1.3;
}

.page-content h2:first-child {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

.page-content h3 {
  font-family: var(--font-heading);
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 2rem 0 0.5rem;
}

.page-content h4 {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  margin: 1.5rem 0 0.4rem;
}

.page-content p {
  margin-bottom: 1.1rem;
}

.page-content ul, .page-content ol {
  margin: 0.75rem 0 1.25rem 1.5rem;
}

.page-content li {
  margin-bottom: 0.3rem;
}

.page-content a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 2px;
  transition: text-decoration-color var(--transition);
}

.page-content a:hover {
  text-decoration-color: var(--color-primary);
}

.page-content blockquote {
  border-left: 3px solid var(--color-accent);
  margin: 1.5rem 0;
  padding: 1rem 1.5rem;
  background: var(--color-banner);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--color-text-muted);
  font-style: italic;
}

.page-content blockquote p:last-child { margin-bottom: 0; }

.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.page-content th, .page-content td {
  padding: 0.65rem 0.9rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.page-content th {
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.page-content tr:nth-child(even) { background: var(--color-banner); }
.page-content tr:hover { background: var(--color-border-light); }

.page-content img {
  border-radius: var(--radius);
  margin: 1.25rem 0;
  box-shadow: var(--shadow-sm);
}

.page-content strong { font-weight: 600; }

/* --- Tags --- */
.page-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.7rem;
  background: var(--color-banner);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
  border-radius: 50px;
  text-decoration: none;
  transition: background var(--transition), border-color var(--transition);
}

.tag:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* ======================
   SIDEBAR
   ====================== */
.content-sidebar {
  position: sticky;
  top: 84px;
}

.sidebar-section {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.sidebar-section h4 {
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border-light);
}

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

.sidebar-nav li {
  margin: 0.15rem 0;
}

.sidebar-nav a {
  display: block;
  padding: 0.35rem 0.6rem;
  font-size: 0.86rem;
  color: var(--color-text-muted);
  border-radius: var(--radius);
  text-decoration: none;
  transition: color var(--transition), background var(--transition);
}

.sidebar-nav a:hover {
  color: var(--color-primary);
  background: var(--color-banner);
}

.sidebar-nav .current a {
  color: var(--color-primary);
  background: var(--color-banner);
  font-weight: 600;
}

.sidebar-cta {
  background: var(--color-banner);
  text-align: center;
}

.sidebar-cta-icon {
  font-size: 2rem;
  margin-bottom: 0.25rem;
}

.sidebar-cta h4 {
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.95rem;
  border-bottom: none;
  padding-bottom: 0;
  color: var(--color-text);
}

.sidebar-cta p {
  font-size: 0.84rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  margin-bottom: 0.75rem;
}

/* ======================
   LIST PAGE
   ====================== */
.page-list {
  padding: 2.5rem 0 4rem;
}

.list-intro {
  max-width: var(--content-width);
  margin-bottom: 2rem;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.75;
}

.list-intro h2 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 1.5rem 0 0.5rem;
}

/* ======================
   FOOTER
   ====================== */
.site-footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: 3.5rem 0 1.5rem;
  margin-top: 4rem;
  font-size: 0.9rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 500;
  color: #fff;
  margin-bottom: 0.75rem;
}

.footer-logo strong {
  font-weight: 800;
}

.footer-logo-icon {
  margin-right: 0.3rem;
}

.footer-desc {
  font-size: 0.88rem;
  line-height: 1.65;
  max-width: 340px;
}

.footer-col h4 {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 0.85rem;
}

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

.footer-col li { margin: 0.3rem 0; }

.footer-col a {
  color: var(--color-footer-text);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color var(--transition);
}

.footer-col a:hover { color: #fff; }

.footer-bottom {
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.35);
}

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

/* Tablet */
@media (max-width: 1024px) {
  .card-grid--4 { grid-template-columns: repeat(2, 1fr); }
  .content-layout { grid-template-columns: 1fr; }

  .content-sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
  }

  .sidebar-cta { grid-column: 1 / -1; }
}

/* Mobile */
@media (max-width: 768px) {
  html { font-size: 15px; }

  .header-inner { height: 60px; }

  .logo-icon { font-size: 1.5rem; }
  .logo-title { font-size: 1.05rem; }
  .logo-tagline { font-size: 0.62rem; }

  .nav-toggle { display: flex; }

  .nav-list {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 0.75rem;
    box-shadow: var(--shadow-md);
  }

  .site-nav.open .nav-list { display: flex; }

  .site-nav a {
    padding: 0.7rem 1rem;
    width: 100%;
  }

  /* Hero */
  .hero { padding: 3.5rem 0 3rem; }
  .hero h1 { font-size: 1.85rem; }
  .hero-lead { font-size: 1rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .hero-badge { font-size: 0.7rem; margin-bottom: 1rem; }

  /* Cards */
  .card-grid--4,
  .card-grid--3 { grid-template-columns: 1fr; }

  /* Banner */
  .page-banner h1 { font-size: 1.6rem; }
  .page-banner { padding: 1.5rem 0 1.75rem; }

  /* Sidebar on mobile: single column */
  .content-sidebar { grid-template-columns: 1fr; }

  /* Footer */
  .footer-top {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

  /* Trust bar */
  .trust-bar {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .container { padding: 0 1rem; }
  .hero h1 { font-size: 1.6rem; }
  .section-intro h2 { font-size: 1.5rem; }
  .card { padding: 1.25rem; }
}