/* ==========================================================================
   Xuemu Creative Skills Workshop - Warm Paper Archive Design System
   Color Palette:
   - Cream Paper (BG): #fff8f3
   - Paper Surface: #f5eee6 / #ffffff
   - Ink Black (Text): #1a1917
   - Secondary Text: #595550
   - Subtle Border: #e6ded4
   - Copper Orange (Function Accent): #c85a17
   - Copper Orange Hover: #a8480f
   - Deep Pine Green (Safety Accent): #1b4d3e
   - Code Surface: #242220 / Text: #ede8e3
   ========================================================================== */

:root {
  --bg-paper: #fff8f3;
  --surface-paper: #f5eee6;
  --surface-card: #ffffff;
  --ink-primary: #1a1917;
  --ink-secondary: #595550;
  --border-subtle: #e6ded4;
  --accent-copper: #c85a17;
  --accent-copper-hover: #a8480f;
  --accent-pine: #1b4d3e;
  --code-bg: #242220;
  --code-text: #ede8e3;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace;
}

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

html {
  font-family: var(--font-family);
  background-color: var(--bg-paper);
  color: var(--ink-primary);
  line-height: 1.75;
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  touch-action: manipulation;
}

/* Accessibility & Focus */
:focus-visible {
  outline: 3px solid var(--accent-copper);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 200;
  padding: 0.6rem 0.9rem;
  background: var(--ink-primary);
  color: var(--bg-paper);
  transform: translateY(-160%);
  transition: transform 160ms cubic-bezier(0.16, 1, 0.3, 1);
}

.skip-link:focus {
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}

/* Header & Nav */
.header {
  border-bottom: 2px solid var(--border-subtle);
  background-color: var(--bg-paper);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--ink-primary);
}

.brand-badge {
  background-color: var(--accent-copper);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
}

.nav-link {
  color: var(--ink-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.4rem 0.6rem;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  border-bottom: 2px solid transparent;
}

@media (hover: hover) {
  .nav-link:hover {
    color: var(--accent-copper);
    border-bottom-color: var(--accent-copper);
  }
}

/* Container */
.main-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  width: 100%;
}

/* Sections */
.section {
  margin-bottom: 4rem;
  scroll-margin-top: 7rem;
}

.section-header {
  margin-bottom: 2rem;
}

.section-header::before {
  content: "";
  display: block;
  width: 3rem;
  height: 3px;
  margin-bottom: 0.75rem;
  background: var(--accent-copper);
}

.section-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--ink-primary);
  margin-bottom: 0.25rem;
  text-wrap: balance;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--ink-secondary);
}

/* Hero Section (Asymmetric Editorial Layout) */
.hero {
  background-color: var(--surface-paper);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 2.5rem;
  margin-bottom: 3.5rem;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 2.5rem;
  align-items: start;
}

.hero-banner {
  background-color: var(--accent-pine);
  color: #ffffff;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  font-size: 0.875rem;
  font-weight: 700;
  display: inline-block;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 1rem;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--ink-secondary);
  margin-bottom: 1.75rem;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.6rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 6px;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  font-family: inherit;
  white-space: nowrap;
  transition: transform 140ms cubic-bezier(0.16, 1, 0.3, 1), background-color 140ms ease, border-color 140ms ease, color 140ms ease;
}

.btn:active,
.filter-btn:active,
.toggle-btn:active,
.copy-cmd-btn:active,
.eco-link:active {
  transform: scale(0.96);
}

.btn-primary {
  background-color: var(--accent-copper);
  color: #ffffff;
}

@media (hover: hover) {
  .btn-primary:hover {
    background-color: var(--accent-copper-hover);
  }
}

.btn-secondary {
  background-color: transparent;
  color: var(--ink-primary);
  border-color: var(--border-subtle);
}

@media (hover: hover) {
  .btn-secondary:hover {
    border-color: var(--accent-copper);
    color: var(--accent-copper);
  }
}

.hero-card {
  background-color: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 1.5rem;
}

.hero-card-title {
  font-size: 0.9rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-copper);
  margin-bottom: 0.75rem;
}

.code-snippet {
  background-color: var(--code-bg);
  color: var(--code-text);
  padding: 1rem;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
  overflow-x: auto;
  position: relative;
}

.code-snippet pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-all;
}

/* Filter Controls */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1.75rem;
}

.filter-btn {
  min-height: 40px;
  padding: 0.4rem 1rem;
  font-size: 0.9rem;
  font-weight: 600;
  background-color: var(--surface-paper);
  color: var(--ink-primary);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  cursor: pointer;
}

.filter-btn.active {
  background-color: var(--accent-copper);
  color: #ffffff;
  border-color: var(--accent-copper);
}

@media (hover: hover) {
  .filter-btn:not(.active):hover {
    border-color: var(--accent-copper);
    color: var(--accent-copper);
  }
}

/* Editorial Ledger Grid (Skills) */
.skills-ledger {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.ledger-item {
  background-color: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  overflow: hidden;
  transition: border-color 0.2s;
}

.ledger-item.expanded {
  border-color: var(--accent-copper);
}

.ledger-header {
  padding: 1.25rem 1.5rem;
  display: grid;
  grid-template-columns: 2fr 1fr 2fr 2fr 120px;
  gap: 1rem;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

@media (hover: hover) {
  .ledger-header:hover {
    background-color: var(--surface-paper);
  }
}

.ledger-name-group {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.ledger-name {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--ink-primary);
  font-family: var(--font-mono);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  overflow-wrap: anywhere;
}

@media (hover: hover) {
  .ledger-name:hover {
    color: var(--accent-copper);
  }
}

.ledger-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  width: fit-content;
}

.tag-auto { background-color: #fce8db; color: #a8480f; }
.tag-visual { background-color: #e2f0d9; color: #1b4d3e; }
.tag-biz { background-color: #fef0d5; color: #8a5700; }
.tag-text { background-color: #e8f1f5; color: #1b4b66; }

.ledger-role {
  font-size: 0.9rem;
  color: var(--ink-secondary);
}

.ledger-input, .ledger-output {
  font-size: 0.875rem;
  color: var(--ink-secondary);
}

.ledger-action {
  text-align: right;
}

.toggle-btn {
  background-color: var(--surface-paper);
  border: 1px solid var(--border-subtle);
  color: var(--ink-primary);
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Ledger Detail Panel */
.ledger-detail {
  display: none;
  padding: 1.5rem;
  background-color: var(--surface-paper);
  border-top: 1px solid var(--border-subtle);
}

.ledger-item.expanded .ledger-detail {
  display: block;
}

.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.25rem;
}

.detail-box {
  background-color: var(--surface-card);
  padding: 1rem;
  border-radius: 6px;
  border: 1px solid var(--border-subtle);
}

.detail-box-title {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--accent-copper);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.detail-box-content {
  font-size: 0.9rem;
  color: var(--ink-primary);
  line-height: 1.6;
}

.detail-file-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  margin: 0 0 1rem;
}

.detail-file-link {
  color: var(--accent-pine);
  font-size: 0.85rem;
  font-weight: 800;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  text-underline-offset: 0.2em;
}

@media (hover: hover) {
  .detail-file-link:hover {
    color: var(--accent-copper);
  }
}

.detail-command-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background-color: var(--code-bg);
  color: var(--code-text);
  padding: 0.75rem 1rem;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.copy-cmd-btn {
  background-color: var(--accent-copper);
  color: #ffffff;
  border: none;
  padding: 0.4rem 0.9rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  min-height: 40px;
  width: 90px; /* Fixed width to prevent layout shift */
  height: 40px; /* Fixed height to prevent layout shift */
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

@media (hover: hover) {
  .copy-cmd-btn:hover {
    background-color: var(--accent-copper-hover);
  }
}

/* Workflows Section */
.workflow-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.workflow-card {
  border-top: 1px solid var(--ink-primary);
  padding: 1.5rem 0 0;
  display: flex;
  flex-direction: column;
}

.workflow-badge {
  background-color: var(--surface-paper);
  color: var(--accent-copper);
  font-weight: 800;
  font-size: 0.8rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  width: fit-content;
  margin-bottom: 0.75rem;
}

.workflow-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.workflow-desc {
  font-size: 0.925rem;
  color: var(--ink-secondary);
  margin-bottom: 1.25rem;

}

.workflow-pipeline {
  background-color: var(--surface-paper);
  padding: 1rem;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.825rem;
  color: var(--ink-primary);
  margin-top: auto;
  border-top: 3px solid var(--accent-copper);
}

/* Standalone Ecosystems Section */
.eco-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.eco-card {
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 0 1.5rem;
}

.eco-title {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
}

.eco-desc {
  font-size: 0.875rem;
  color: var(--ink-secondary);
  margin-bottom: 1rem;
}

.eco-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.eco-link {
  font-size: 0.825rem;
  font-weight: 700;
  color: var(--accent-copper);
  text-decoration: none;
  padding: 0.3rem 0.6rem;
  background-color: var(--surface-paper);
  border-radius: 4px;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}

@media (hover: hover) {
  .eco-link:hover {
    background-color: var(--accent-copper);
    color: #ffffff;
  }
}

/* Security Table Section */
.security-table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  background-color: var(--surface-card);
}

.security-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.security-table th, .security-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
}

.security-table th {
  background-color: var(--surface-paper);
  font-weight: 800;
  color: var(--ink-primary);
}

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

.status-public {
  color: var(--accent-pine);
  font-weight: 700;
}

.status-private {
  color: var(--accent-copper);
  font-weight: 700;
}

.anatomy-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 2rem;
  background-color: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 2rem;
}

.anatomy-title {
  color: var(--accent-copper);
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.anatomy-copy {
  color: var(--ink-secondary);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.not-found-layout {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
}

.not-found-panel {
  max-width: 32rem;
  padding: 3rem 2rem;
  text-align: center;
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
}

.not-found-code {
  color: var(--accent-copper);
  font-size: 4rem;
  font-weight: 900;
  margin-bottom: 0.5rem;
}

.not-found-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.not-found-copy {
  color: var(--ink-secondary);
  margin-bottom: 2rem;
}

/* Footer */
.footer {
  background-color: var(--surface-paper);
  border-top: 2px solid var(--border-subtle);
  padding: 2.5rem 1.5rem;
  margin-top: auto;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-size: 0.9rem;
  color: var(--ink-secondary);
}

.footer-links {
  display: flex;
  gap: 1.25rem;
  list-style: none;
}

.footer-link {
  color: var(--ink-secondary);
  text-decoration: none;
  font-weight: 600;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}

@media (hover: hover) {
  .footer-link:hover {
    color: var(--accent-copper);
  }
}

/* Responsive Overrides (375px & 320px Reflow) */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
  }
  .ledger-header {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .ledger-action {
    text-align: left;
    margin-top: 0.5rem;
  }

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

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

@media (max-width: 480px) {
  .header-container {
    align-items: flex-start;
  }

  .brand {
    gap: 0.5rem;
  }

  .header nav {
    width: 100%;
    overflow-x: auto;
  }

  .nav-links {
    width: max-content;
    gap: 0.35rem;
  }

  .brand-title {
    font-size: 1rem;
    white-space: nowrap;
  }

  .brand-badge {
    font-size: 0.68rem;
    padding-inline: 0.45rem;
  }

  .main-container {
    padding: 1.25rem 1rem 3rem;
  }

  .hero {
    padding: 1.5rem 1.25rem;
  }

  .hero-title {
    font-size: 1.65rem;
  }

  .hero-actions,
  .filter-bar {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .btn,
  .filter-btn {
    min-width: 0;
    white-space: normal;
  }

  .workflow-grid,
  .eco-grid {
    grid-template-columns: 1fr;
  }

  .anatomy-grid {
    padding: 1.25rem;
  }

  .detail-command-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .copy-cmd-btn {
    width: 100%;
  }

  .security-table-wrapper {
    overflow: visible;
    border: 0;
    background: transparent;
  }

  .security-table,
  .security-table tbody,
  .security-table tr,
  .security-table td {
    display: block;
    width: 100%;
  }

  .security-table thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
  }

  .security-table tr {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-subtle);
  }

  .security-table td {
    display: grid;
    grid-template-columns: minmax(6.5rem, 38%) 1fr;
    gap: 0.75rem;
    padding: 0.45rem 0;
    border: 0;
  }

  .security-table td::before {
    content: attr(data-label);
    color: var(--ink-secondary);
    font-size: 0.75rem;
    font-weight: 700;
  }

  .footer-links {
    width: 100%;
    flex-wrap: wrap;
    gap: 0.25rem 1rem;
  }
}