/* =========================================================================
   2040 Hub Dashboard - Shared styles
   Design language: dark, neon green/cyan accent, monospace for code/addresses,
   clean inter/system font for UI. Mobile-first, responsive.
   ========================================================================= */

/* Dark theme (default) */
:root,
:root[data-theme="dark"] {
  --bg-0: #07090c;
  --bg-1: #0d1116;
  --bg-2: #141a22;
  --bg-3: #1b232d;
  --border: #232b36;
  --border-strong: #2f3a48;
  --text: #e6edf3;
  --text-dim: #8b96a5;
  --text-muted: #5c6676;
  --accent: #00ff9d;          /* neon green */
  --accent-2: #00d4ff;         /* cyan */
  --accent-soft: rgba(0, 255, 157, 0.12);
  --accent-soft-2: rgba(0, 212, 255, 0.10);
  --danger: #ff5c7a;
  --warn: #ffc857;
  --shadow-glow: 0 0 40px rgba(0, 255, 157, 0.12);
  --accent-on: #002a1a;        /* text color on accent background */
  --ambient-1: rgba(0, 212, 255, 0.08);
  --ambient-2: rgba(0, 255, 157, 0.08);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display",
    "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
}

/* Light theme */
:root[data-theme="light"] {
  --bg-0: #f7f8fa;
  --bg-1: #ffffff;
  --bg-2: #f1f3f7;
  --bg-3: #e7eaf0;
  --border: #e1e5ec;
  --border-strong: #cfd5de;
  --text: #0f1720;
  --text-dim: #566272;
  --text-muted: #8b96a5;
  --accent: #00b97a;           /* darker green for contrast on white */
  --accent-2: #0096c7;          /* darker cyan */
  --accent-soft: rgba(0, 185, 122, 0.10);
  --accent-soft-2: rgba(0, 150, 199, 0.10);
  --danger: #d93951;
  --warn: #b8810b;
  --shadow-glow: 0 8px 32px rgba(0, 185, 122, 0.12);
  --accent-on: #ffffff;
  --ambient-1: rgba(0, 150, 199, 0.08);
  --ambient-2: rgba(0, 185, 122, 0.08);
}

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

html, body {
  height: 100%;
  background: var(--bg-0);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

code, pre, .mono { font-family: var(--font-mono); }

/* Ambient background gradient */
body::before {
  content: "";
  position: fixed; inset: 0;
  background:
    radial-gradient(1000px 600px at 85% -10%, var(--ambient-1), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, var(--ambient-2), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

/* =====================  Buttons  ===================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  transition: all .18s ease;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-on);
  box-shadow: 0 0 0 rgba(0,255,157,0);
}
.btn-primary:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.btn-block { width: 100%; }

/* =====================  Cards  ===================== */

.card {
  background: linear-gradient(180deg, var(--bg-1) 0%, var(--bg-2) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

/* =====================  Top nav  ===================== */

.topbar {
  position: sticky; top: 0;
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
  padding: 0 20px;
  background: color-mix(in srgb, var(--bg-0) 85%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 50;
}

.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; letter-spacing: 0.5px;
}
.brand .logo {
  width: 28px; height: 28px;
  min-width: 28px;
  border-radius: 8px;
  overflow: hidden;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-2);
  flex-shrink: 0;
}
.brand .logo img {
  width: 28px; height: 28px;
  object-fit: cover;
  display: block;
  border-radius: 8px;
}
.brand-text { font-size: 16px; }
.brand-text .dim { color: var(--text-dim); font-weight: 500; }

.topbar-right { display: flex; align-items: center; gap: 10px; }

.wallet-chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
}
.wallet-chip .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
}

/* Lang switch */
.lang-switch {
  display: inline-flex;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px;
}
.lang-switch .lang-btn {
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
  transition: all .15s ease;
}
.lang-switch .lang-btn.active {
  background: var(--accent);
  color: var(--accent-on);
}

/* Theme toggle */
.theme-toggle {
  width: 34px; height: 34px;
  min-width: 34px;
  border-radius: 50%;
  background: var(--bg-2);
  border: 1px solid var(--border);
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all .15s ease;
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1;
  padding: 0;
  flex-shrink: 0;
}
.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* =====================  Layout  ===================== */

.page {
  position: relative; z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 20px 60px;
}

.page-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.page-header h1 {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-header .subtitle {
  color: var(--text-dim);
  font-size: 13px;
  margin-top: 4px;
}

/* =====================  Sidebar layout (dashboard)  ===================== */

.layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 24px;
  position: relative; z-index: 1;
  max-width: 1280px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

.sidebar {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
  height: fit-content;
  position: sticky;
  top: 76px;
}

.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--text-dim);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all .15s ease;
  margin-bottom: 2px;
}
.nav-item:hover { background: var(--bg-2); color: var(--text); }
.nav-item.active {
  background: var(--accent-soft);
  color: var(--accent);
}
.nav-item .nav-icon { width: 20px; text-align: center; }

.main { min-width: 0; }

/* =====================  Docs list  ===================== */

.doc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
}

.doc-item {
  display: flex; align-items: center; gap: 12px;
  padding: 16px;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all .18s ease;
}
.doc-item:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}
.doc-item .icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--accent-soft);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.doc-item .name {
  flex: 1; min-width: 0;
  font-weight: 600;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.doc-item .arrow { color: var(--text-muted); }

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-dim);
}
.empty-state .icon { font-size: 40px; margin-bottom: 12px; }

/* =====================  Doc content (markdown)  ===================== */

.doc-view { display: none; }

.back-btn {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--accent);
  font-size: 14px; font-weight: 500;
  padding: 6px 0;
  margin-bottom: 12px;
}
.back-btn:hover { text-decoration: underline; }

#doc-title {
  font-size: 26px; font-weight: 700;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.markdown-body { font-size: 15px; }
.markdown-body h1, .markdown-body h2, .markdown-body h3 {
  font-weight: 700; margin: 24px 0 12px; letter-spacing: -0.01em;
}
.markdown-body h1 { font-size: 24px; padding-bottom: 6px; border-bottom: 1px solid var(--border); }
.markdown-body h2 { font-size: 20px; }
.markdown-body h3 { font-size: 17px; }
.markdown-body p { margin: 10px 0; color: var(--text); }
.markdown-body ul, .markdown-body ol { margin: 10px 0; padding-left: 24px; }
.markdown-body li { margin: 4px 0; }
.markdown-body code {
  background: var(--bg-2);
  padding: 2px 6px; border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--accent-2);
}
.markdown-body pre {
  background: var(--bg-2);
  border: 1px solid var(--border);
  padding: 14px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 14px 0;
}
.markdown-body pre code { background: none; padding: 0; color: var(--text); }
.markdown-body blockquote {
  border-left: 3px solid var(--accent);
  padding: 6px 14px;
  margin: 14px 0;
  color: var(--text-dim);
  background: var(--accent-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.markdown-body table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 14px; }
.markdown-body th, .markdown-body td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.markdown-body th { background: var(--bg-2); font-weight: 600; }
.markdown-body a { color: var(--accent-2); }
.markdown-body img { max-width: 100%; border-radius: var(--radius-sm); }
.markdown-body hr { border: none; border-top: 1px solid var(--border); margin: 24px 0; }

/* =====================  Spinner / states  ===================== */

.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--border-strong);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.center-col {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 12px;
  min-height: 200px;
  color: var(--text-dim);
}

.toast {
  position: fixed;
  left: 50%; bottom: 30px;
  transform: translateX(-50%);
  padding: 10px 16px;
  background: var(--bg-2);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  font-size: 13px;
  z-index: 1000;
  opacity: 0; pointer-events: none;
  transition: opacity .2s ease;
}
.toast.show { opacity: 1; }
.toast.error { border-color: var(--danger); color: var(--danger); }
.toast.success { border-color: var(--accent); color: var(--accent); }

/* =====================  Responsive  ===================== */

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 16px;
  }
  .sidebar {
    position: static;
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 10px;
  }
  .sidebar .nav-item { flex: 0 0 auto; margin-bottom: 0; }
  .page { padding: 16px; }
}

@media (max-width: 540px) {
  .topbar { padding: 0 12px; height: 56px; }
  .brand-text { font-size: 14px; }
  .wallet-chip { font-size: 11px; padding: 5px 10px; }
  .page-header h1 { font-size: 20px; }
  #doc-title { font-size: 22px; }
  .doc-grid { grid-template-columns: 1fr; }
}