/* =========================================================
   FFP License Website — Shared Stylesheet
   ========================================================= */

/* ---------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   --------------------------------------------------------- */
:root {
  /* Brand colours */
  --primary:       #2c3e50;
  --accent:        #3498db;
  --accent-hover:  #2980b9;
  --success:       #27ae60;
  --warning:       #e67e22;

  /* Layout */
  --bg:            #f5f7fa;
  --card-bg:       #ffffff;
  --nav-bg:        #ffffff;
  --text:          #2d3436;
  --text-muted:    #636e72;
  --code-bg:       #f0f4f8;
  --border:        #dfe6e9;

  /* Shadows */
  --shadow-sm:     0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md:     0 4px 20px rgba(0, 0, 0, 0.08);

  /* Spacing & Shape */
  --radius:        10px;
  --radius-sm:     6px;
  --nav-height:    64px;
  --container-max: 900px;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo,
               "Courier New", monospace;

  /* Transitions */
  --transition: 0.2s ease;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --primary:       #93c9e8;
    --accent:        #5dade2;
    --accent-hover:  #85c1e9;
    --success:       #2ecc71;

    --bg:            #0d1117;
    --card-bg:       #161b22;
    --nav-bg:        #161b22;
    --text:          #c9d1d9;
    --text-muted:    #8b949e;
    --code-bg:       #1c2733;
    --border:        #30363d;

    --shadow-sm:     0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md:     0 4px 20px rgba(0, 0, 0, 0.5);
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text);
  background-color: var(--bg);
}

img, svg {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

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

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

/* ---------------------------------------------------------
   Navigation
   --------------------------------------------------------- */
.site-nav {
  background: var(--nav-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 200;
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--primary);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-brand:hover {
  color: var(--accent);
  text-decoration: none;
}

.nav-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  align-items: center;
}

.nav-links a {
  display: inline-block;
  color: var(--primary);
  text-decoration: none;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  transition: background-color var(--transition), color var(--transition);
}

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

/* Hamburger button (mobile only) */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--primary);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition);
  flex-shrink: 0;
}

.nav-toggle:hover {
  background-color: var(--border);
}

.nav-toggle svg {
  display: block;
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
}

/* Mobile nav layout */
@media (max-width: 680px) {
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--nav-bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 0.75rem 1rem;
    gap: 0.25rem;
    box-shadow: var(--shadow-md);
  }

  .nav-links.is-open {
    display: flex;
  }

  .nav-links a {
    width: 100%;
    padding: 0.65rem 1rem;
    font-size: 0.95rem;
  }
}

/* ---------------------------------------------------------
   Container / Layout
   --------------------------------------------------------- */
.container {
  max-width: var(--container-max);
  margin: 2.5rem auto;
  background: var(--card-bg);
  padding: 2.5rem 3rem;
  box-shadow: var(--shadow-md);
  border-radius: var(--radius);
}

.container-wide {
  max-width: 1100px;
}

@media (max-width: 768px) {
  .container {
    margin: 1rem;
    padding: 1.5rem 1.25rem;
    border-radius: var(--radius-sm);
  }
}

@media (max-width: 480px) {
  .container {
    margin: 0;
    border-radius: 0;
    padding: 1.25rem 1rem;
    box-shadow: none;
  }
}

/* ---------------------------------------------------------
   Typography
   --------------------------------------------------------- */
h1, h2, h3, h4 {
  color: var(--primary);
  line-height: 1.3;
  margin-top: 0;
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  margin-bottom: 0.5rem;
}

h2 {
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  margin-top: 2.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}

h3 {
  font-size: 1.1rem;
  margin-top: 1.5rem;
  color: var(--text);
}

h4 {
  font-size: 1rem;
  margin-top: 1.25rem;
  margin-bottom: 0.25rem;
}

p {
  margin-top: 0;
  margin-bottom: 1rem;
}

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

li {
  margin-bottom: 0.4rem;
}

/* ---------------------------------------------------------
   Page Header
   --------------------------------------------------------- */
.page-header {
  border-bottom: 2px solid var(--primary);
  padding-bottom: 1.25rem;
  margin-bottom: 2rem;
  text-align: center;
}

.page-header h1 {
  margin-bottom: 0.4rem;
}

.page-header .subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin: 0;
}

/* ---------------------------------------------------------
   Buttons
   --------------------------------------------------------- */
.btn {
  display: inline-block;
  padding: 0.55rem 1.25rem;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--transition), transform 0.1s;
}

.btn:active {
  transform: scale(0.98);
}

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

.btn-primary:hover {
  background-color: var(--accent-hover);
  color: #ffffff;
  text-decoration: none;
}

.btn-primary.copied {
  background-color: var(--success);
}

/* ---------------------------------------------------------
   Code & Monospace Blocks
   --------------------------------------------------------- */
code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background-color: var(--code-bg);
  border: 1px solid var(--border);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

.code-block {
  background-color: var(--primary);
  color: #ecf0f1;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
  margin: 0.75rem 0 1rem;
  line-height: 1.5;
}

.notice-box {
  background-color: var(--code-bg);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  padding: 1.25rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  white-space: pre-wrap;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  overflow-x: auto;
  line-height: 1.6;
}

/* ---------------------------------------------------------
   Copy / Details Dropdown (License page)
   --------------------------------------------------------- */
.copy-section {
  background-color: var(--code-bg);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  margin: 2rem 0;
  overflow: hidden;
}

.copy-section details {
  width: 100%;
}

.copy-section summary {
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--primary);
  background-color: var(--code-bg);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.copy-section summary::-webkit-details-marker {
  display: none;
}

.copy-section summary::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--accent);
  line-height: 1;
}

.copy-section details[open] summary::after {
  content: '−';
}

.copy-section details[open] summary {
  border-bottom: 1px solid var(--border);
}

.dropdown-content {
  padding: 1.25rem 1.5rem;
}

.license-raw-box {
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  padding: 1rem;
  height: 220px;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: 0.825rem;
  white-space: pre-wrap;
  margin-bottom: 1rem;
  border-radius: var(--radius-sm);
  line-height: 1.5;
}

/* ---------------------------------------------------------
   Section identifier
   --------------------------------------------------------- */
.section-id {
  font-weight: 700;
  color: var(--primary);
}

/* ---------------------------------------------------------
   Comparison Table
   --------------------------------------------------------- */
.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 1.25rem 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 560px;
  font-size: 0.9rem;
}

.comparison-table th,
.comparison-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border: 1px solid var(--border);
}

.comparison-table th {
  background-color: var(--primary);
  color: #ffffff;
  font-weight: 600;
  white-space: nowrap;
}

.comparison-table tr:nth-child(even) td {
  background-color: var(--code-bg);
}

.comparison-table tr:hover td {
  background-color: rgba(52, 152, 219, 0.08);
}

.comparison-table td:first-child {
  font-weight: 500;
}

/* ---------------------------------------------------------
   FAQ
   --------------------------------------------------------- */
.faq-item {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

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

.faq-question {
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 0.5rem;
  font-size: 1.05rem;
}

.faq-answer {
  color: var(--text-muted);
}

.faq-answer ul,
.faq-answer ol {
  margin-top: 0.5rem;
}

/* ---------------------------------------------------------
   Badge Gallery
   --------------------------------------------------------- */
.badge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.badge-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

.badge-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.badge-card h3 {
  margin: 0 0 0.75rem;
  font-size: 0.9rem;
  color: var(--primary);
}

.badge-preview {
  min-height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--code-bg);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  margin-bottom: 1rem;
}

.badge-section {
  background-color: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.badge-section h3 {
  margin-top: 0;
  color: var(--primary);
  font-size: 1rem;
}

.badge-section .badge-preview {
  background: var(--card-bg);
}

/* Copy button (badges page) */
.copy-button {
  display: inline-block;
  background-color: var(--accent);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.9rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition);
  margin-top: 0.5rem;
}

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

.copy-button.copied {
  background-color: var(--success);
}

/* ---------------------------------------------------------
   Footer
   --------------------------------------------------------- */
.site-footer {
  text-align: center;
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.site-footer a {
  color: var(--accent);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
  text-align: left;
}

.footer-grid h3 {
  font-size: 1rem;
  margin-top: 0;
  margin-bottom: 0.75rem;
  color: var(--primary);
}

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

.footer-grid li {
  margin-bottom: 0.4rem;
}

/* ---------------------------------------------------------
   Inline helpers (replacing ad-hoc inline styles)
   --------------------------------------------------------- */
.text-center  { text-align: center; }
.text-muted   { color: var(--text-muted); }
.font-bold    { font-weight: 700; }
.mt-large     { margin-top: 2.5rem; }
.divider {
  border: 0;
  border-top: 2px solid var(--border);
  margin: 3.5rem 0;
}

/* ---------------------------------------------------------
   Accessibility
   --------------------------------------------------------- */
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}