/* ===========================
   全知專案 — Global Styles
   =========================== */

:root {
  --bg:          #0f1117;
  --bg-surface:  #181c27;
  --bg-card:     #1e2333;
  --border:      #2a2f45;
  --accent:      #7c9ef8;
  --accent-dim:  #3a4a7a;
  --text:        #e8eaf0;
  --text-muted:  #8891aa;
  --text-dim:    #555e7a;
  --success:     #5cb85c;
  --radius:      12px;
  --radius-sm:   8px;
  --font:        'Segoe UI', system-ui, -apple-system, sans-serif;
  --transition:  0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

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

a:hover {
  text-decoration: underline;
}

/* ===========================
   Header
   =========================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: default;
}

.logo-icon {
  font-size: 20px;
  color: var(--accent);
}

.logo-text {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.site-nav {
  display: flex;
  gap: 4px;
}

.nav-link {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 14px;
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text);
  background: var(--bg-card);
  text-decoration: none;
}

/* ===========================
   Hero
   =========================== */

.hero {
  padding: 80px 24px 60px;
  text-align: center;
}

.hero-inner {
  max-width: 600px;
  margin: 0 auto;
}

.hero-title {
  font-size: 42px;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #fff 30%, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.8;
}

/* ===========================
   Domains Section
   =========================== */

.domains-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.section-header {
  margin-bottom: 32px;
}

.section-title {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 8px;
}

.section-desc {
  color: var(--text-muted);
  font-size: 14px;
}

.domains-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

/* Domain Card */
.domain-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
}

.domain-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-dim), transparent);
  opacity: 0;
  transition: var(--transition);
}

.domain-card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
  text-decoration: none;
}

.domain-card:hover::before {
  opacity: 0.15;
}

.domain-card-icon {
  font-size: 28px;
  line-height: 1;
}

.domain-card-name {
  font-size: 17px;
  font-weight: 600;
}

.domain-card-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  flex: 1;
}

.domain-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.domain-card-status {
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.domain-card-arrow {
  color: var(--accent);
  font-size: 16px;
  opacity: 0;
  transition: var(--transition);
}

.domain-card:hover .domain-card-arrow {
  opacity: 1;
  transform: translateX(4px);
}

/* Empty State */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--text-dim);
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.4;
}

.empty-state p {
  font-size: 15px;
}

/* Add Domain Button */
.add-domain-wrapper {
  display: flex;
  justify-content: center;
}

.add-domain-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: transparent;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
}

.add-domain-btn:hover {
  border-color: var(--accent-dim);
  color: var(--accent);
  background: var(--bg-card);
}

.add-icon {
  font-size: 18px;
  line-height: 1;
}

/* ===========================
   Philosophy Section
   =========================== */

.philosophy-section {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 80px 24px;
}

.philosophy-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.philosophy-title {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 40px;
  text-align: center;
}

.belief-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.belief-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}

.belief-icon {
  font-size: 24px;
  color: var(--accent);
  margin-bottom: 16px;
}

.belief-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
}

.belief-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ===========================
   Footer
   =========================== */

.site-footer {
  text-align: center;
  padding: 32px 24px;
  color: var(--text-dim);
  font-size: 13px;
}

/* ===========================
   Modal
   =========================== */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 440px;
  margin: 24px;
  transform: translateY(16px);
  transition: transform var(--transition);
}

.modal-overlay.open .modal {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border);
}

.modal-header h3 {
  font-size: 16px;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 16px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  transition: var(--transition);
}

.modal-close:hover {
  background: var(--bg-surface);
  color: var(--text);
}

.modal-body {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-body label {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 6px;
  display: block;
}

.modal-body input {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 14px;
  font-family: var(--font);
  transition: var(--transition);
  outline: none;
}

.modal-body input:focus {
  border-color: var(--accent-dim);
  box-shadow: 0 0 0 3px rgba(124, 158, 248, 0.1);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 16px 24px 20px;
  border-top: 1px solid var(--border);
}

.btn-cancel,
.btn-confirm {
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid var(--border);
}

.btn-cancel {
  background: transparent;
  color: var(--text-muted);
}

.btn-cancel:hover {
  background: var(--bg-surface);
  color: var(--text);
}

.btn-confirm {
  background: var(--accent);
  color: #0f1117;
  border-color: var(--accent);
  font-weight: 600;
}

.btn-confirm:hover {
  background: #9ab3fa;
  border-color: #9ab3fa;
}

/* ===========================
   Domain Page (domains/*.html)
   =========================== */

.domain-page-header {
  max-width: 1100px;
  margin: 0 auto;
  padding: 60px 24px 40px;
}

.domain-page-icon {
  font-size: 40px;
  margin-bottom: 16px;
  display: block;
}

.domain-page-title {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 10px;
}

.domain-page-desc {
  color: var(--text-muted);
  font-size: 16px;
}

.domain-content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px 80px;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
}

.domain-sidebar {
  position: sticky;
  top: 80px;
  height: fit-content;
}

.sidebar-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}

.sidebar-title {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.sidebar-link {
  display: block;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 14px;
  transition: var(--transition);
  margin-bottom: 2px;
}

.sidebar-link:hover,
.sidebar-link.active {
  background: var(--bg-surface);
  color: var(--text);
  text-decoration: none;
}

.domain-main-content {
  min-width: 0;
}

/* Map / Outline */
.map-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 24px;
}

.map-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.map-tree {
  list-style: none;
  padding: 0;
}

.map-tree li {
  padding: 6px 0;
  font-size: 14px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.map-tree li::before {
  content: '—';
  color: var(--text-dim);
  flex-shrink: 0;
}

.map-tree li a {
  color: var(--text-muted);
}

.map-tree li a:hover {
  color: var(--accent);
}

.map-tree li.filled {
  color: var(--text);
}

.map-tree li.filled::before {
  content: '◆';
  color: var(--accent);
  font-size: 8px;
}

.map-tree .subtree {
  padding-left: 20px;
  border-left: 1px solid var(--border);
  margin-left: 6px;
}

/* Responsive */
@media (max-width: 768px) {
  .hero-title { font-size: 30px; }

  .domain-content {
    grid-template-columns: 1fr;
  }

  .domain-sidebar {
    position: static;
  }

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