/* 
 * Swiss Design Theme
 * Solid Difference Support Site
 * Black + White + Grey / Helvetica / Minimal
 */

:root {
  /* Monochrome palette */
  --color-bg: #ffffff;
  --color-surface: #fafafa;
  --color-border: #e0e0e0;
  --color-border-dark: #cccccc;
  --color-text: #1a1a1a;
  --color-text-muted: #666666;
  --color-heading: #000000;
  --color-link: #000000;
  --color-link-hover: #444444;
  --color-accent: #000000;
  --color-code-bg: #f5f5f5;
  
  /* Typography - Swiss style */
  --font-body: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-heading: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono: 'SF Mono', 'Menlo', 'Monaco', monospace;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  
  /* Layout */
  --content-max-width: 800px;
  --header-height: 60px;
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
}

/* Base */
html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  margin: 0;
  padding: 0;
  min-height: 100vh;
}

/* ============================================
   Header
   ============================================ */
.site-header {
  height: var(--header-height);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.site-logo img {
  height: 50px;
  width: auto;
}

.site-logo:hover {
  opacity: 0.7;
}

/* Main Navigation */
.main-nav {
  display: flex;
  gap: var(--space-lg);
}

.main-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-xs) 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-heading);
  border-bottom-color: var(--color-accent);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  margin: 5px 0;
}

@media (max-width: 640px) {
  .nav-toggle {
    display: block;
  }
  
  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--space-md) var(--space-lg);
    gap: var(--space-md);
  }
  
  .main-nav.open {
    display: flex;
  }
}

/* ============================================
   Main Content
   ============================================ */
main {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 var(--space-md) 0;
  color: var(--color-heading);
}

h1 {
  font-size: 2.5rem;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-lg);
}

h2 {
  font-size: 1.5rem;
  margin-top: var(--space-xl);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

h3 {
  font-size: 1.125rem;
  margin-top: var(--space-lg);
}

p {
  margin: 0 0 var(--space-md) 0;
}

.lead {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

/* Links */
a {
  color: var(--color-link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color 0.15s;
}

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

/* Lists */
ul, ol {
  padding-left: var(--space-lg);
  margin: 0 0 var(--space-md) 0;
}

li {
  margin-bottom: var(--space-xs);
}

/* ============================================
   Section Cards (for landing page)
   ============================================ */
.section-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin: var(--space-xl) 0;
}

.section-card {
  border: 1px solid var(--color-border);
  padding: var(--space-md) var(--space-lg);
  text-decoration: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.section-card:hover {
  border-color: var(--color-border-dark);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.section-card h3 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 var(--space-sm) 0;
}

.section-card p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin: 0;
}

.section-card .icon {
  display: block;
  margin-bottom: var(--space-sm);
  color: #444;
}

.section-card .icon svg {
  width: 40px;
  height: 40px;
}

/* ============================================
   Download Cards
   ============================================ */
.download-list {
  list-style: none;
  padding: 0;
  margin: var(--space-lg) 0;
}

.download-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-sm);
  transition: border-color 0.2s;
}

.download-item:hover {
  border-color: var(--color-border-dark);
}

.download-info h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 var(--space-xs) 0;
}

.download-info .meta {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-heading);
  color: white;
  text-decoration: none;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: background 0.2s;
}

.download-btn:hover {
  background: var(--color-link-hover);
  color: white;
}

/* ============================================
   Firmware Flasher Section
   ============================================ */
.flasher-container {
  border: 1px solid var(--color-border);
  padding: var(--space-lg);
  margin: var(--space-lg) 0;
  background: var(--color-surface);
}

.flasher-container h3 {
  margin-top: 0;
}

/* ============================================
   FAQ / Docs
   ============================================ */
.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-question {
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question::after {
  content: '+';
  font-size: 1.25rem;
  font-weight: 400;
}

.faq-item.open .faq-question::after {
  content: '−';
}

.faq-answer {
  display: none;
  padding-top: var(--space-md);
  color: var(--color-text-muted);
}

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

/* Docs list */
.docs-list {
  list-style: none;
  padding: 0;
}

.docs-list li {
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.docs-list li:last-child {
  border-bottom: none;
}

.docs-list a {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.docs-list .doc-type {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--color-text-muted);
  min-width: 40px;
}

/* ============================================
   Code & Blockquotes
   ============================================ */
code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-code-bg);
  padding: 0.1em 0.4em;
  border-radius: 3px;
}

pre {
  background: #1a1a1a;
  color: #f0f0f0;
  padding: var(--space-md);
  overflow-x: auto;
  margin: var(--space-md) 0;
  font-size: 0.875rem;
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
}

blockquote {
  border-left: 3px solid var(--color-border-dark);
  padding-left: var(--space-md);
  margin: var(--space-lg) 0;
  color: var(--color-text-muted);
  font-style: italic;
}

/* ============================================
   Tables
   ============================================ */
table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-md) 0;
  font-size: 0.875rem;
}

th, td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

tr:hover {
  background: var(--color-surface);
}

/* ============================================
   Alerts / Notices
   ============================================ */
.alert {
  padding: var(--space-md);
  margin: var(--space-md) 0;
  border-left: 3px solid var(--color-border-dark);
  background: var(--color-surface);
}

.alert-warning {
  border-left-color: #000000;
  background: #f5f5f5;
}

.alert h4 {
  margin: 0 0 var(--space-xs) 0;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.alert p:last-child {
  margin: 0;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  text-align: center;
}

.footer-content {
  max-width: var(--content-max-width);
  margin: 0 auto;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

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

.footer-content a:hover {
  color: var(--color-text);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 2px solid var(--color-border-dark);
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.btn:hover {
  background: var(--color-surface);
  border-color: var(--color-heading);
  color: var(--color-text);
}

.btn-primary {
  background: var(--color-heading);
  border-color: var(--color-heading);
  color: white;
}

.btn-primary:hover {
  background: var(--color-link-hover);
  border-color: var(--color-link-hover);
  color: white;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 640px) {
  html {
    font-size: 15px;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  main {
    padding: var(--space-lg) var(--space-md);
  }
  
  .section-grid {
    grid-template-columns: 1fr;
  }
  
  .download-item {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }
}

/* ============================================
   Utility Classes
   ============================================ */
.text-muted {
  color: var(--color-text-muted);
}

.text-center {
  text-align: center;
}

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-lg { margin-top: var(--space-lg); }
.mb-lg { margin-bottom: var(--space-lg); }