/* ==========================================================================
   Vibe Coding Guide - Minimal & Simple Stylesheet
   Design Philosophy: Clean, Readable, Content-First (Notion & Linear Vibe)
   ========================================================================== */

:root {
  --bg: #ffffff;
  --bg-subtle: #f8fafc;
  --bg-card: #ffffff;
  --bg-hover: #f1f5f9;
  
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-subtle: #94a3b8;

  --border: #e2e8f0;
  --border-focus: #3b82f6;

  --primary: #2563eb;
  --primary-light: #eff6ff;
  --accent: #0f172a;

  --code-bg: #f1f5f9;
  --code-text: #0f172a;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --content-width: 760px;
}

[data-theme="dark"] {
  --bg: #0b0f17;
  --bg-subtle: #111827;
  --bg-card: #161f30;
  --bg-hover: #1e293b;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;

  --border: #243044;
  --border-focus: #60a5fa;

  --primary: #3b82f6;
  --primary-light: rgba(59, 130, 246, 0.15);
  --accent: #f8fafc;

  --code-bg: #1e293b;
  --code-text: #e2e8f0;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg);
  color: var(--text-main);
  font-family: 'Plus Jakarta Sans', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  transition: background-color 0.2s ease;
}

[data-theme="dark"] .site-header {
  background-color: rgba(11, 15, 23, 0.85);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--text-main);
}

.brand-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  background: var(--bg-hover);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-icon {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-icon:hover {
  background: var(--bg-hover);
  color: var(--text-main);
}

/* Hero Section */
.hero {
  padding: 4.5rem 0 3rem 0;
  border-bottom: 1px solid var(--border);
}

.hero-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.25;
  margin-bottom: 1.25rem;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* Quick Navigation / Table of Contents */
.toc-bar {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 1rem 0;
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--border);
  scrollbar-width: none;
}
.toc-bar::-webkit-scrollbar {
  display: none;
}

.toc-link {
  white-space: nowrap;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  transition: all 0.15s ease;
}

.toc-link:hover, .toc-link.active {
  background: var(--text-main);
  color: var(--bg);
  border-color: var(--text-main);
}

/* Content Sections */
.guide-section {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--border);
}

.guide-section:last-of-type {
  border-bottom: none;
}

.section-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.section-heading {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}

.paragraph {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

/* Simple Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin: 1.75rem 0;
}

.simple-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.simple-card:hover {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-sm);
}

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

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.card-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Callout Box */
.callout {
  background: var(--bg-subtle);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.callout strong {
  color: var(--text-main);
}

/* Checklist */
.checklist-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.check-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: opacity 0.2s ease;
}

.check-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.check-item:first-child {
  padding-top: 0;
}

.check-box {
  margin-top: 0.25rem;
  width: 18px;
  height: 18px;
  border-radius: 4px;
  accent-color: var(--primary);
  cursor: pointer;
}

.check-label {
  flex: 1;
  font-size: 0.95rem;
  color: var(--text-main);
}

.check-item.done .check-label {
  text-decoration: line-through;
  color: var(--text-subtle);
}

/* Code & Prompt Block with Copy Button */
.code-block-wrap {
  position: relative;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin: 1.25rem 0;
  overflow: hidden;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  background: rgba(0, 0, 0, 0.03);
  border-bottom: 1px solid var(--border);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

.btn-copy {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: all 0.2s ease;
}

.btn-copy:hover {
  background: var(--bg-hover);
  color: var(--text-main);
}

.code-content {
  padding: 1.25rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--code-text);
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

/* Interactive Prompt Generator Tool */
.prompt-tool-box {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin: 2rem 0;
}

.tool-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.tool-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.tool-form-group {
  margin-bottom: 1rem;
}

.tool-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--text-main);
}

.tool-input, .tool-select {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s ease;
}

.tool-input:focus, .tool-select:focus {
  border-color: var(--primary);
}

.btn-generate {
  width: 100%;
  padding: 0.85rem;
  background: var(--primary);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.95rem;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: opacity 0.2s ease;
  margin-top: 0.5rem;
}

.btn-generate:hover {
  opacity: 0.9;
}

/* Footer */
.site-footer {
  padding: 3rem 0;
  border-top: 1px solid var(--border);
  margin-top: 4rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-subtle);
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.footer-link {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
}

.footer-link:hover {
  color: var(--text-main);
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 2rem;
  }
}