/* 
 * CSS - Minimalist Hardcore Dual Theme (Light/Dark)
 * Following rules: No Chinese characters. Extremely clean geometry. Borderless structure.
 */

:root {
  --font-primary: 'Outfit', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  /* DAWN MODE (Light) - The ultimate minimalist canvas */
  --bg-color: #FFFFFF;
  --text-primary: #18181A;
  --text-secondary: #71717A;
  --text-highlight: #000000;
  
  --glass-bg: #F8F8F9;
  --glass-border: rgba(0, 0, 0, 0.08); /* Zero glass, just solid fine borders */
  --glass-hover: rgba(0, 0, 0, 0.04);
  --terminal-bar-bg: #F0F0F2;
  --terminal-box-shadow: 0 12px 30px -10px rgba(0, 0, 0, 0.05);
  
  --brand-color: #c4956a;
}

html[data-theme='dark'] {
  /* MIDNIGHT MODE (Dark) - Kilo.ai inspired brutalist CLI */
  --bg-color: #0E0E0F;
  --text-primary: #EBEBEB;
  --text-secondary: #888888;
  --text-highlight: #FFFFFF;
  
  --glass-bg: #141415;
  --glass-border: rgba(255, 255, 255, 0.06);
  --glass-hover: rgba(255, 255, 255, 0.04);
  --terminal-bar-bg: #111112;
  --terminal-box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.6);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-primary);
  color: var(--text-primary);
  background-color: var(--bg-color);
  overflow-x: hidden;
  min-height: 100vh;
  transition: background-color 0.25s ease, color 0.25s ease;
  display: flex;
  flex-direction: column;
}

/* Navbar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 4rem;
  width: 100%;
  position: relative;
  z-index: 100;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  color: var(--text-highlight);
  transition: color 0.25s ease;
}

.logo svg {
  color: var(--brand-color);
}

/* Dynamic Logo Animation (Coffee Maker) */
.dynamic-brand-logo {
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.logo:hover .dynamic-brand-logo {
  /* Intentionally static on hover - no wobble */
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  position: relative;
}

.icon-switch {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.25s ease;
  padding: 4px;
}

.icon-switch:hover {
  color: var(--text-highlight);
}

/* Hero Section */

.lang-switch {
  background: transparent;
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  font-family: var(--font-primary);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 4px;
  transition: all 0.25s ease;
  cursor: pointer;
  min-width: 52px;
}

.lang-switch:hover {
  background: var(--glass-hover);
  color: var(--text-highlight);
}

.lang-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 6px;
  min-width: 140px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.15);
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
  z-index: 1000;
  pointer-events: none;
}

.lang-dropdown.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.lang-option {
  padding: 10px 16px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.lang-option:hover {
  background: var(--glass-hover);
  color: var(--text-highlight);
}

.lang-option.selected {
  color: var(--brand-color);
  background: hsla(24, 80%, 50%, 0.08);
}

/* Hero Section */
.hero-section {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex-grow: 1;
  text-align: center;
  padding: 0 2rem 4rem 2rem;
}

/* OPC University Link (top of hero) */
.opc-university-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  padding: 0.5rem 1.25rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-secondary);
  text-decoration: none;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  transition: all 0.3s ease;
}

.opc-university-link:hover {
  color: var(--brand-color);
  border-color: var(--brand-color);
  background: hsla(24, 80%, 50%, 0.08);
}

.opc-university-link svg {
  transition: transform 0.3s ease;
}

.opc-university-link:hover svg {
  transform: translateX(3px);
}

.hero-content {
  margin-bottom: 3.5rem;
}

.headline {
  font-size: clamp(2.5rem, 4vw, 3.5rem); /* Slimmer architecture */
  font-weight: 600; /* Removed over-heavy weight */
  line-height: 1.15;
  letter-spacing: -0.04em;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
  transition: color 0.25s ease;
}

.static-text {
  color: var(--text-highlight);
}

.dynamic-wrapper {
  color: var(--brand-color);
}

.cursor {
  display: inline-block;
  margin-left: 2px;
  width: 4px;
  animation: blink 1s step-start infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.subtitle {
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  color: var(--text-secondary);
  font-weight: 400;
  max-width: 500px;
  margin: 0 auto;
  line-height: 1.6;
  transition: color 0.25s ease;
}

/* Quick Start Container */
.quick-start-container {
  width: 100%;
  max-width: 680px; /* Slimmer, code-focused */
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Mac-like Window Mockup -> Minimalist Terminal */
.mac-window {
  width: 100%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px; /* Geometrically rigid */
  box-shadow: var(--terminal-box-shadow);
  overflow: hidden;
  transition: background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.window-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.2rem;
  background: var(--terminal-bar-bg);
  border-bottom: 1px solid var(--glass-border);
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.traffic-lights {
  display: flex;
  gap: 6px;
  width: 60px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  opacity: 0.5; /* Desaturate for serious look */
}
.red { background-color: #FF5F56; }
.yellow { background-color: #FFBD2E; }
.green { background-color: #27C93F; }

.platform-tabs {
  display: flex;
  background: var(--glass-hover);
  border-radius: 4px;
  padding: 4px;
  gap: 4px;
  transition: background-color 0.25s ease;
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-primary);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 4px;
  transition: all 0.2s ease;
  cursor: pointer;
}

.tab-btn.active {
  background: var(--bg-color); 
  color: var(--text-highlight);
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.header-spacer {
  width: 60px;
}

.window-body {
  padding: 1.5rem 2rem;
  text-align: left;
}

.instruction-hint {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  letter-spacing: 0px;
  transition: color 0.25s ease;
}

.code-block {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--glass-hover);
  padding: 1rem 1.25rem;
  border-radius: 6px;
  border: 1px solid var(--glass-border);
  position: relative;
  transition: all 0.25s ease;
}

.prompt-symbol {
  color: var(--brand-color);
  font-family: var(--font-mono);
  margin-right: 12px;
  font-weight: 600;
  user-select: none;
}

code {
  font-family: var(--font-mono);
  font-size: 0.95rem; /* Better scale for mono */
  color: var(--text-primary);
  flex-grow: 1;
  overflow-x: auto;
  white-space: nowrap;
  transition: color 0.25s ease;
}

code::-webkit-scrollbar {
  height: 4px;
}
code::-webkit-scrollbar-thumb {
  background: var(--glass-border);
  border-radius: 4px;
}

.copy-button {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 6px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  cursor: pointer;
  margin-left: 1rem;
}

.copy-button:hover {
  background: var(--glass-hover);
  color: var(--text-highlight);
}

.footnote {
  margin-top: 2rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  opacity: 0.6;
  font-weight: 400;
  transition: color 0.25s ease;
}

/* Responsive constraints */
@media (max-width: 768px) {
  .navbar {
    padding: 1.5rem 2rem;
  }
  .window-body {
    padding: 1.5rem;
  }
  code {
    font-size: 0.85rem;
  }
}