/* ==========================================================================
   CatNet TUI — Custom GitHub Pages CSS Design System
   Brand Palette strictly mapped from internal/ui/styles.go
   No third-party font requests; using pure system font stack
   ========================================================================== */

:root {
  --bg:             #0b0c10;  /* fundo escuro */
  --accent:         #66fcf1;  /* ciano — título, destaque, seleção */
  --accent-dim:     #45a29e;  /* teal — cabeçalhos secundários, bordas */
  --text:           #c5c6c7;  /* texto padrão sobre fundo escuro */
  --danger:         #ff0055;  /* estado de erro/offline */
  --success:        #00ff88;  /* host ativo/sucesso */
  --surface:        #12161f;  /* card e container background */
  --surface-border: #1f2a38;  /* borda sutil */
  --surface-header: #18202c;  /* cabeçalho de cards/terminal */
  
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "Roboto Mono", "Fira Code", Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  
  --max-width: 1100px;
  --radius: 8px;
  --transition: all 0.2s ease-in-out;
}

/* Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.6;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.65rem; margin-top: 2rem; border-bottom: 1px solid var(--surface-border); padding-bottom: 0.5rem; }
h3 { font-size: 1.25rem; color: var(--accent-dim); margin-top: 1.5rem; }

p {
  margin-bottom: 1.25rem;
  color: var(--text);
}

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

a:hover {
  color: #a3fff9;
  text-decoration: underline;
}

hr {
  border: 0;
  border-top: 1px solid var(--surface-border);
  margin: 2.5rem 0;
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

/* Header */
.site-header {
  background-color: rgba(11, 12, 16, 0.95);
  border-bottom: 1px solid var(--surface-border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.brand-logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.brand-prompt {
  color: var(--accent-dim);
}

.site-nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav-link {
  color: var(--text);
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

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

/* Main Content Wrapper */
.main-content {
  flex: 1;
  padding: 2rem 0 4rem;
}

/* Hero Section */
.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
  margin-bottom: 3.5rem;
  padding-top: 1rem;
}

.hero-text {
  display: flex;
  flex-direction: column;
}

.hero-title {
  font-size: 2.5rem;
  color: var(--accent);
  margin-bottom: 0.75rem;
  letter-spacing: -0.5px;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.hero-badges img {
  height: 22px;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

.btn-primary:hover {
  background-color: #88fdf5;
  color: var(--bg);
  text-decoration: none;
  box-shadow: 0 0 15px rgba(102, 252, 241, 0.4);
}

.btn-secondary {
  background-color: var(--surface);
  color: var(--accent);
  border-color: var(--surface-border);
}

.btn-secondary:hover {
  background-color: var(--surface-header);
  border-color: var(--accent-dim);
  text-decoration: none;
}

/* Terminal Window Preview Component */
.terminal-window {
  background-color: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.6);
}

.terminal-header {
  background-color: var(--surface-header);
  padding: 0.6rem 1rem;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--surface-border);
}

.terminal-dots {
  display: flex;
  gap: 6px;
  margin-right: 1rem;
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-red { background-color: var(--danger); }
.dot-yellow { background-color: #ffbd2e; }
.dot-green { background-color: var(--success); }

.terminal-title {
  font-size: 0.825rem;
  color: var(--accent-dim);
  font-family: var(--font-mono);
  text-align: center;
  flex: 1;
}

.terminal-body {
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #000;
}

.terminal-body img {
  width: 100%;
  height: auto;
  display: block;
}

/* Feature Cards Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0 3rem;
}

.feature-card {
  background-color: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: var(--transition);
}

.feature-card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.feature-title {
  font-size: 1.1rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.feature-desc {
  font-size: 0.9rem;
  color: var(--text);
  margin-bottom: 0;
}

/* Section Titles */
.section-header {
  margin-bottom: 1.5rem;
}

/* "Why TUI?" Section (Q&A Cards) */
.why-tui-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0 3rem;
}

.qa-card {
  background-color: var(--surface);
  border: 1px solid var(--surface-border);
  border-left: 3px solid var(--accent-dim);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
}

code {
  font-family: var(--font-mono);
  background-color: var(--surface-header);
  color: var(--accent);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9em;
  border: 1px solid var(--surface-border);
}

.qa-question {
  font-size: 1.05rem;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 0.65rem;
  line-height: 1.45;
}

.qa-answer {
  font-size: 0.925rem;
  color: var(--text);
  line-height: 1.6;
  margin-bottom: 0;
}

/* Tabbed Installation Component */
.tab-container {
  background-color: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 1.5rem 0 3rem;
}

.tab-nav {
  display: flex;
  background-color: var(--surface-header);
  border-bottom: 1px solid var(--surface-border);
  overflow-x: auto;
}

.tab-button {
  background: none;
  border: none;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 0.75rem 1.25rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
}

.tab-button:hover {
  color: var(--accent);
  background-color: rgba(102, 252, 241, 0.05);
}

.tab-button.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  background-color: var(--surface);
  font-weight: 600;
}

.tab-panel {
  display: none;
  padding: 1.25rem;
  position: relative;
}

.tab-panel.active {
  display: block;
}

.code-block-wrapper {
  position: relative;
}

.code-block-wrapper pre {
  background-color: #08090c;
  border: 1px solid var(--surface-border);
  border-radius: 6px;
  padding: 1rem 3.5rem 1rem 1rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent);
}

.code-block-wrapper code {
  color: var(--accent);
}

.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background-color: var(--surface-header);
  border: 1px solid var(--surface-border);
  color: var(--text);
  border-radius: 4px;
  padding: 0.3rem 0.6rem;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.copy-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.copy-btn.copied {
  border-color: var(--success);
  color: var(--success);
  background-color: rgba(0, 255, 136, 0.1);
}

/* Tables (Keybindings & Ecosystem) */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background-color: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--surface-border);
}

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

th {
  background-color: var(--surface-header);
  color: var(--accent-dim);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

td {
  font-size: 0.9rem;
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background-color: rgba(102, 252, 241, 0.02);
}

kbd {
  background-color: var(--surface-header);
  border: 1px solid var(--surface-border);
  border-radius: 4px;
  padding: 0.15rem 0.4rem;
  font-size: 0.825rem;
  color: var(--accent);
  font-family: var(--font-mono);
  box-shadow: 0 2px 0 var(--surface-border);
}

/* Footer */
.site-footer {
  background-color: var(--surface);
  border-top: 1px solid var(--surface-border);
  padding: 2rem 0;
  margin-top: auto;
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-subtext {
  font-size: 0.85rem;
  color: #8a8b8c;
  margin-top: 0.25rem;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
  font-size: 0.9rem;
}

/* Responsive Media Queries */
@media (max-width: 868px) {
  .hero-section {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .footer-container {
    flex-direction: column;
    align-items: flex-start;
  }
}