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

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  --bg: #FAF8F5;
  --bg-card: #FFFFFF;
  --bg-code: #2D2A24;
  --bg-code-header: #3A3630;
  --text: #3A3226;
  --text-secondary: #6B6358;
  --text-muted: #9B9183;
  --accent: #6B7F3B;
  --accent-light: #7E9544;
  --coral: #E8845C;
  --border: #E2D9CC;
  --border-light: #EDE7DE;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(58, 50, 38, 0.06);
  --shadow-md: 0 2px 8px rgba(58, 50, 38, 0.08);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

code {
  font-family: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;
  font-size: 0.85rem;
}

/* === Topbar === */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 248, 245, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
}

.topbar-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 12px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.topbar-logo {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

.topbar-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
}

.topbar-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.topbar-links a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: color 0.15s;
}

.topbar-links a:hover { color: var(--text); }

.topbar-gh {
  display: flex;
  align-items: center;
  color: var(--text-muted) !important;
}
.topbar-gh:hover { color: var(--text) !important; }

/* === Container === */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 32px;
}

/* === Hero === */
.hero {
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--border-light);
}

.hero-row {
  display: flex;
  align-items: center;
  gap: 24px;
}

.hero-sub {
  margin-top: 16px;
}

.hero-logo {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-lg);
  flex-shrink: 0;
  box-shadow: var(--shadow-md);
}

.hero h1 {
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.025em;
  max-width: 680px;
}

.hero h1 a { text-decoration: underline; text-underline-offset: 3px; }

.hero-sub {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.7;
}

.hero-actions { margin-top: 32px; }

.install-cmd {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-code);
  border-radius: var(--radius);
  padding: 12px 20px;
  box-shadow: var(--shadow-md);
}

.copy-btn {
  background: transparent;
  border: 1px solid rgba(232, 223, 208, 0.3);
  color: #E8DFD0;
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}
.copy-btn:hover {
  background: rgba(232, 223, 208, 0.1);
  border-color: rgba(232, 223, 208, 0.5);
}

.install-cmd code {
  color: #E8DFD0;
  font-size: 0.9rem;
}

.cmd-prompt { color: var(--coral); margin-right: 8px; }

.install-hint {
  margin-top: 10px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* === Sections === */
.section {
  padding: 56px 0;
  border-bottom: 1px solid var(--border-light);
}

h2.problem-text {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.5;
  letter-spacing: -0.015em;
  max-width: 680px;
}

.ralph-row {
  display: flex;
  align-items: center;
  gap: 24px;
}
.ralph-img {
  width: 80px;
  height: 80px;
  border-radius: 12px;
  flex-shrink: 0;
  object-fit: cover;
}
.ralph-row h3 { margin: 0 0 8px; }
.ralph-row p { margin: 0; color: var(--text-muted); font-size: 0.9rem; }
.ralph-row a { color: var(--coral); }

.section h2 {
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin-bottom: 8px;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

.section-link {
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.section-link a { text-decoration: underline; text-underline-offset: 2px; }

/* === Steps grid === */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.step-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.step-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.step-card code {
  background: var(--bg);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.8rem;
}

/* === Code blocks === */
.code-block {
  border: 1px solid #44403A;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.code-header {
  background: var(--bg-code-header);
  padding: 8px 16px;
  border-bottom: 1px solid #44403A;
}

.code-tab {
  font-size: 0.75rem;
  color: #A89F93;
  font-family: 'IBM Plex Mono', monospace;
}

.code-tab.active { color: #D4CABC; }

.code-block pre {
  background: var(--bg-code);
  margin: 0;
  padding: 20px 24px;
  overflow-x: auto;
  line-height: 1.75;
}

.code-block code {
  color: #E8DFD0;
  font-size: 0.825rem;
  background: none;
}

.c-prompt { color: var(--coral); }
.c-dim { color: #8B8278; }
.c-ok { color: #8CAA50; }
.c-run { color: #D4A843; }
.c-pend { color: #7B7368; }
.c-str { color: #C9A96E; }
.c-key { color: #8CAA50; }
.c-comment { color: #6B6358; }

/* === Workflow grid === */
.workflow-grid {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.wf-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.wf-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.wf-header h3 {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent);
}

.wf-badge {
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px 10px;
}

.wf-card > p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 14px;
}

.wf-pipeline {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
}

.wf-pipeline span {
  color: var(--text-secondary);
}

.wf-arrow {
  color: var(--text-muted);
  margin: 0 2px;
}

/* === Security === */
.security-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.security-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.security-item h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.security-item p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

@media (max-width: 768px) {
  .security-grid { grid-template-columns: 1fr; }
}

/* === Dashboard === */
.dashboard-frame {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background: var(--bg-card);
}

.dashboard-frame img {
  width: 100%;
  display: block;
}

/* === Commands === */
.cmd-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 24px;
}

.cmd-group h4 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.cmd-row {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 6px 0;
  border-bottom: 1px solid var(--border-light);
}

.cmd-row:last-child { border-bottom: none; }

.cmd-row code {
  color: var(--coral);
  white-space: nowrap;
  background: none;
  font-size: 0.8rem;
  flex-shrink: 0;
}

.cmd-row span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* === Architecture === */
.arch-block {
  margin-top: 24px;
}

.arch-block pre {
  background: var(--bg-code);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  overflow-x: auto;
  line-height: 1.6;
  box-shadow: var(--shadow-md);
}

.arch-block code {
  color: #E8DFD0;
  font-size: 0.8rem;
  background: none;
}

/* === Footer === */
.footer {
  padding: 32px 0;
}

.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  justify-content: space-between;
}

.footer p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer a { color: var(--text-secondary); }
.footer a:hover { color: var(--text); }

/* === Responsive === */
@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .topbar-inner { padding: 12px 20px; }
  .topbar-links a:not(.topbar-gh) { display: none; }

  .hero { padding: 48px 0 40px; }
  .hero-row { flex-direction: row; gap: 24px; align-items: flex-start; }
  .hero-logo { width: 100px; height: 100px; }
  .hero h1 { font-size: 1.5rem; }
  .hero-sub { font-size: 1rem; }

  .steps-grid { grid-template-columns: 1fr; }

  .section { padding: 40px 0; }

  .cmd-grid { grid-template-columns: 1fr; }
  .cmd-row { flex-direction: column; gap: 2px; }
  .cmd-row code { white-space: normal; }

  .wf-pipeline { font-size: 0.7rem; }

  .footer-inner {
    flex-direction: column;
    gap: 4px;
    padding: 0 20px;
  }
}

@media (max-width: 480px) {
  .hero-row { gap: 16px; }
  .hero-logo { width: 80px; height: 80px; }
  .hero h1 { font-size: 1.3rem; }
  .install-cmd { padding: 10px 14px; }
  .install-cmd code { font-size: 0.8rem; }
  .code-block pre { padding: 14px 16px; }
  .arch-block pre { padding: 16px 18px; }
}