/* ========================================================================
HTTP STATUS CODE EXPLORER - CROSS-CULTURAL DESIGN SYSTEM
Target: RO / DACH / EN | Psychological: Trust + Clarity + Micro-reward
======================================================================== */

/* 1. VARIABLES & THEME =================================================== */
:root {
  /* Colors */
  --bg-page: #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-surface: #F1F5F9;
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --warm: #D97706;
  --success: #10B981;
  --error: #EF4444;
  --warning: #F59E0B;
  --info: #3B82F6;
  --border: #E2E8F0;
  --shadow-sm: 0 1px 3px rgba(15,23,42,0.08);
  --shadow-md: 0 4px 12px rgba(15,23,42,0.12);
  --focus-ring: 0 0 0 3px rgba(37,99,235,0.25);
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  /* Layout */
  --radius: 12px;
  --radius-sm: 8px;
  --max-width: 1200px;
  --header-height: 64px;
  /* Typography */
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Fira Code", "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.8125rem, 0.75rem + 0.3vw, 0.9375rem);
  --text-base: clamp(0.875rem, 0.8rem + 0.3vw, 1rem);
  --text-lg: clamp(1rem, 0.9rem + 0.4vw, 1.125rem);
  --text-xl: clamp(1.25rem, 1rem + 1vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.2rem + 1.2vw, 1.875rem);
  --text-3xl: clamp(1.875rem, 1.5rem + 1.5vw, 2.25rem);
  /* Motion */
  --ease: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --ease-slow: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  /* Status Category Colors */
  --cat-1xx: #6B7280;
  --cat-1xx-bg: #F3F4F6;
  --cat-2xx: #059669;
  --cat-2xx-bg: #D1FAE5;
  --cat-3xx: #D97706;
  --cat-3xx-bg: #FEF3C7;
  --cat-4xx: #DC2626;
  --cat-4xx-bg: #FEE2E2;
  --cat-5xx: #7C3AED;
  --cat-5xx-bg: #EDE9FE;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-page: #0B1120;
    --bg-card: #111827;
    --bg-surface: #1E293B;
    --text-primary: #F1F5F9;
    --text-secondary: #CBD5E1;
    --text-muted: #64748B;
    --border: #334155;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --cat-1xx-bg: #1F2937;
    --cat-2xx-bg: #064E3B;
    --cat-3xx-bg: #78350F;
    --cat-4xx-bg: #7F1D1D;
    --cat-5xx-bg: #4C1D95;
  }
}

html.theme-dark {
  --bg-page: #0B1120;
  --bg-card: #111827;
  --bg-surface: #1E293B;
  --text-primary: #F1F5F9;
  --text-secondary: #CBD5E1;
  --text-muted: #64748B;
  --border: #334155;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --cat-1xx-bg: #1F2937;
  --cat-2xx-bg: #064E3B;
  --cat-3xx-bg: #78350F;
  --cat-4xx-bg: #7F1D1D;
  --cat-5xx-bg: #4C1D95;
}

/* 2. BASE & RESET ======================================================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1, "liga" 1;
}
body {
  font-family: var(--font-sans);
  background: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding-bottom: 100px;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font: inherit; }
ul, ol { list-style: none; }

/* 3. LAYOUT & CONTAINERS ================================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding-inline: var(--space-lg);
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-height);
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-primary);
  font-size: var(--text-lg);
  line-height: 1.2;
  transition: opacity var(--ease);
}
.logo:hover { opacity: 0.9; }
.logo-img {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  display: block;
  border-radius: var(--radius-sm);
}
.logo strong {
  font-weight: 700;
  letter-spacing: -0.02em;
}
main { flex: 1; padding-block: var(--space-2xl); }

/* 4. TYPOGRAPHY & UTILITY ============================================= */
h1, h2, h3, h4 {
  text-wrap: balance;
  line-height: 1.2;
  font-weight: 600;
}
h1 { font-size: var(--text-3xl); margin-bottom: var(--space-md); }
h2 { font-size: var(--text-2xl); margin-bottom: var(--space-lg); }
h3 { font-size: var(--text-xl); }
.text-center { text-align: center; }
.text-muted  { color: var(--text-muted); }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* 5. COMPONENTS ========================================================= */
/* Language Switcher - Pill Design */
.lang-switch {
  display: inline-flex;
  background: var(--bg-surface);
  padding: 4px;
  border-radius: 999px;
  gap: 4px;
  align-items: center;
  width: auto;
}
.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  transition: all 0.2s ease;
  white-space: nowrap;
}
.lang-btn:hover { color: var(--text-primary); }
.lang-btn[aria-current="true"],
.lang-btn.active {
  background: var(--bg-card);
  color: var(--accent);
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
}
/* Theme Toggle */
.theme-toggle {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  display: grid; place-items: center;
  font-size: 1.1rem;
}
/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  border: 1px solid transparent;
  background: var(--accent);
  color: #fff;
  transition: var(--ease);
}
.btn:hover { background: var(--accent-hover); }
.btn--outline {
  background: transparent;
  border-color: var(--border);
  color: var(--text-primary);
}
.btn--outline:hover { background: var(--bg-surface); }
/* Forms */
.form-group { margin-bottom: var(--space-md); }
.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  margin-bottom: var(--space-xs);
}
.form-input, .form-textarea {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: var(--text-base);
  transition: var(--ease);
}
.form-input:focus, .form-textarea:focus {
  outline: none;
  box-shadow: var(--focus-ring);
  border-color: var(--accent);
}
.form-input.is-error, .form-textarea.is-error {
  border-color: var(--error);
  box-shadow: 0 0 0 3px rgba(239,68,68,0.2);
}
.form-help { font-size: var(--text-xs); color: var(--text-muted); margin-top: var(--space-xs); }

/* Tool Card */
.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--ease-slow);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  position: relative;
  contain: layout style;
}

/* 6. TOOL-SPECIFIC ====================================================== */

/* Search Section */
.search-section {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}
.search-section .form-input {
  flex: 1;
  min-width: 200px;
  font-family: var(--font-mono);
  font-size: var(--text-lg);
}
.search-section .btn {
  flex-shrink: 0;
}

/* Category Filter Tabs */
.category-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  justify-content: center;
}
.cat-tab {
  padding: var(--space-xs) var(--space-md);
  border: 1px solid var(--border);
  background: var(--bg-card);
  border-radius: 999px;
  font-size: var(--text-sm);
  color: var(--text-secondary);
  transition: var(--ease);
  cursor: pointer;
  font-weight: 500;
  font-family: var(--font-mono);
}
.cat-tab:hover,
.cat-tab.is-active {
  color: #fff;
  border-color: transparent;
}
.cat-tab[data-cat="all"]:hover,
.cat-tab[data-cat="all"].is-active {
  background: var(--accent);
  color: #fff;
}
.cat-tab[data-cat="1xx"]:hover,
.cat-tab[data-cat="1xx"].is-active { background: var(--cat-1xx); color: #fff; }
.cat-tab[data-cat="2xx"]:hover,
.cat-tab[data-cat="2xx"].is-active { background: var(--cat-2xx); color: #fff; }
.cat-tab[data-cat="3xx"]:hover,
.cat-tab[data-cat="3xx"].is-active { background: var(--cat-3xx); color: #fff; }
.cat-tab[data-cat="4xx"]:hover,
.cat-tab[data-cat="4xx"].is-active { background: var(--cat-4xx); color: #fff; }
.cat-tab[data-cat="5xx"]:hover,
.cat-tab[data-cat="5xx"].is-active { background: var(--cat-5xx); color: #fff; }

/* Status Code Grid */
.status-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}
.status-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-xs);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  cursor: pointer;
  transition: var(--ease);
  text-align: center;
  min-height: 72px;
}
.status-chip:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.status-chip .chip-code {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  line-height: 1.2;
}
.status-chip .chip-name {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  margin-top: 2px;
  line-height: 1.3;
}
.status-chip.cat-1xx { border-left: 3px solid var(--cat-1xx); }
.status-chip.cat-2xx { border-left: 3px solid var(--cat-2xx); }
.status-chip.cat-3xx { border-left: 3px solid var(--cat-3xx); }
.status-chip.cat-4xx { border-left: 3px solid var(--cat-4xx); }
.status-chip.cat-5xx { border-left: 3px solid var(--cat-5xx); }
.status-chip.cat-1xx .chip-code { color: var(--cat-1xx); }
.status-chip.cat-2xx .chip-code { color: var(--cat-2xx); }
.status-chip.cat-3xx .chip-code { color: var(--cat-3xx); }
.status-chip.cat-4xx .chip-code { color: var(--cat-4xx); }
.status-chip.cat-5xx .chip-code { color: var(--cat-5xx); }
.status-chip.is-selected {
  border-color: var(--accent);
  box-shadow: var(--focus-ring);
  background: var(--bg-surface);
}

/* Detail Panel */
.detail-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-xl);
  margin-top: var(--space-lg);
  display: none;
}
.detail-panel.is-visible { display: block; }

.detail-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}
.detail-code {
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: 800;
  line-height: 1;
}
.detail-code.cat-1xx { color: var(--cat-1xx); }
.detail-code.cat-2xx { color: var(--cat-2xx); }
.detail-code.cat-3xx { color: var(--cat-3xx); }
.detail-code.cat-4xx { color: var(--cat-4xx); }
.detail-code.cat-5xx { color: var(--cat-5xx); }
.detail-name {
  font-size: var(--text-xl);
  font-weight: 600;
}

/* Category Badge */
.cat-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-sm);
  border-radius: 999px;
  font-size: var(--text-xs);
  font-weight: 600;
  font-family: var(--font-mono);
}
.cat-badge.cat-1xx { background: var(--cat-1xx-bg); color: var(--cat-1xx); }
.cat-badge.cat-2xx { background: var(--cat-2xx-bg); color: var(--cat-2xx); }
.cat-badge.cat-3xx { background: var(--cat-3xx-bg); color: var(--cat-3xx); }
.cat-badge.cat-4xx { background: var(--cat-4xx-bg); color: var(--cat-4xx); }
.cat-badge.cat-5xx { background: var(--cat-5xx-bg); color: var(--cat-5xx); }

/* Detail Sections */
.detail-section {
  margin-bottom: var(--space-lg);
}
.detail-section:last-child { margin-bottom: 0; }
.detail-section-title {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}
.detail-section-body {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--text-secondary);
}
.detail-section-body ul {
  list-style: disc;
  padding-left: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}
.detail-section-body ul li {
  line-height: 1.6;
}

/* RFC Link */
.rfc-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--accent);
  font-weight: 500;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  text-decoration: none;
  border: 1px solid var(--border);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  transition: var(--ease);
}
.rfc-link:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* PHP Media Tip Box */
.tip-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--warm);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.7;
}
.tip-box code {
  font-family: var(--font-mono);
  background: var(--bg-surface);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

/* No Results */
.no-results {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--text-muted);
  font-size: var(--text-lg);
  display: none;
}
.no-results.is-visible { display: block; }

/* Quick Picks */
.quick-picks {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  justify-content: center;
}
.quick-pick {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  cursor: pointer;
  transition: var(--ease);
}
.quick-pick:hover {
  border-color: var(--accent);
  background: var(--bg-surface);
}

/* Copy button in detail */
.copy-btn-inline {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: var(--text-xs);
  cursor: pointer;
  transition: var(--ease);
}
.copy-btn-inline:hover {
  background: var(--bg-surface);
  color: var(--text-primary);
}
.copy-btn-inline.is-copied {
  background: var(--cat-2xx-bg);
  color: var(--cat-2xx);
  border-color: var(--cat-2xx);
}

/* Result count */
.result-count {
  text-align: center;
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

/* 7. STICKY DONATE ====================================================== */
.sticky-donate-wrapper {
  position: fixed;
  bottom: 48px;
  right: 24px;
  z-index: 90;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--ease), transform var(--ease);
  pointer-events: none;
}
.sticky-donate-wrapper.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.sticky-donate-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: #FFDD00;
  color: #111;
  font-weight: 600;
  font-size: var(--text-sm);
  border-radius: 999px;
  box-shadow: var(--shadow-md);
  border: none;
  text-decoration: none;
  transition: transform var(--ease), box-shadow var(--ease);
}
.sticky-donate-btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 16px rgba(255, 205, 0, 0.3);
}
.sticky-donate-btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}
.donate-icon { font-size: 1.2em; }

/* 8. MODAL =============================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}
.modal-overlay.is-active {
  opacity: 1;
  visibility: visible;
}
.modal-container {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  max-width: 90vw;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
}
.modal-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
  z-index: 1;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 0.2s ease;
}
.modal-close:hover {
  background: var(--bg-surface);
  color: var(--text-primary);
}
.modal-content {
  padding: var(--space-2xl);
  overflow-y: auto;
  max-height: 80vh;
}
.modal-loading {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--text-muted);
}

/* 9. ANIMATIONS ========================================================== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.detail-panel.is-visible {
  animation: fadeIn 0.25s ease-out;
}

/* 10. RESPONSIVE ========================================================= */
@media (max-width: 640px) {
  :root {
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
  }
  .search-section {
    flex-direction: column;
  }
  .search-section .form-input {
    min-width: 100%;
  }
  .status-grid {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  }
  .status-chip {
    min-height: 60px;
    padding: var(--space-xs);
  }
  .status-chip .chip-code {
    font-size: var(--text-lg);
  }
  .detail-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .detail-code {
    font-size: var(--text-2xl);
  }
  .lang-btn span { display: none; }
  .lang-btn { padding: 6px 8px; font-size: 1.2rem; }
  .sticky-donate-wrapper { bottom: 16px; right: 16px; }
  .sticky-donate-btn { padding: 8px 14px; font-size: var(--text-xs); border-radius: 999px; }
  .sticky-donate-btn .donate-text { display: inline-flex !important; }
  .category-tabs { gap: 4px; }
  .cat-tab { padding: var(--space-xs) var(--space-sm); font-size: var(--text-xs); }
}

/* 11. REDUCED MOTION ==================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .sticky-donate-wrapper, .sticky-donate-btn {
    transition: none !important;
    animation: none !important;
  }
}

/* 12. PRINT ============================================================== */
@media print {
  .site-header,
  .subsite-banner,
  .btn,
  .theme-toggle,
  .lang-switch,
  .sticky-donate-wrapper,
  .subsite-legal-footer,
  .category-tabs,
  .search-section,
  .quick-picks { display: none; }
  body { background: #fff; color: #000; padding-bottom: 0; }
  .tool-card { break-inside: avoid; box-shadow: none; border: 1px solid #000; }
  .detail-panel { display: block !important; border: 1px solid #000; }
  .status-grid { grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); }
}