:root {
    --bg-page: #f5f7fa;
    --fg-base: #1f2937;
    --fg-muted: #667085;
    --surface: #ffffff;
    --surface-soft: #f1f4f8;
    --border: rgba(31, 41, 55, 0.12);
    --shadow: 0 0 0 transparent;
    --accent-start: #1e3a8a;
    --accent-mid: #2563eb;
    --accent-end: #1d4ed8;
    --accent-soft: rgba(37, 99, 235, 0.12);
    --accent-strong: rgba(30, 58, 138, 0.2);
    --chip-bg: rgba(30, 58, 138, 0.1);
    --chip-fg: #1e2b45;
    --glow-start: transparent;
    --glow-mid: transparent;
    --glow-end: transparent;
    --glow-start-soft: transparent;
    --glow-mid-soft: transparent;
    --glow-end-soft: transparent;
    --shadow-color: transparent;
    --shadow-color-strong: transparent;
    --shadow-color-accent: transparent;
    --shadow-color-accent-strong: transparent;
    --surface-highlight: transparent;
    --surface-highlight-strong: transparent;
    --surface-hover-shadow: 0 0 0 transparent;
    --pointer-x: 50%;
    --pointer-y: 50%;
    --pointer-opacity: 0;
  }

  :root[data-theme="dark"] {
    --bg-page: #0f1318;
    --fg-base: #e5e7eb;
    --fg-muted: #9ca3af;
    --surface: #151a21;
    --surface-soft: #1b212a;
    --border: rgba(148, 163, 184, 0.12);
    --shadow: 0 0 0 transparent;
    --accent-start: #5b7cff;
    --accent-mid: #60a5fa;
    --accent-end: #3b82f6;
    --accent-soft: rgba(96, 165, 250, 0.18);
    --accent-strong: rgba(91, 124, 255, 0.24);
    --chip-bg: rgba(96, 165, 250, 0.16);
    --chip-fg: #e2e8f0;
    --glow-start: transparent;
    --glow-mid: transparent;
    --glow-end: transparent;
    --glow-start-soft: transparent;
    --glow-mid-soft: transparent;
    --glow-end-soft: transparent;
    --shadow-color: transparent;
    --shadow-color-strong: transparent;
    --shadow-color-accent: transparent;
    --shadow-color-accent-strong: transparent;
    --surface-highlight: transparent;
    --surface-highlight-strong: transparent;
    --surface-hover-shadow: 0 0 0 transparent;
    --pointer-opacity: 0;
  }

  html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
  }

  body {
    background: var(--bg-page);
    color: var(--fg-base);
    overscroll-behavior: none;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    position: relative;
    isolation: isolate;
  }

  :root[data-theme="dark"] html {
    background-color: var(--bg-page);
  }

  :root[data-theme="dark"] body {
    background-color: var(--bg-page);
    background-image: none;
  }

  body::before {
    content: "";
    position: fixed;
    inset: 0;
    display: none;
  }

  :root[data-theme="dark"] body::before {
    display: none;
  }

  body > header,
  body > main,
  body > footer {
    position: relative;
    z-index: 1;
  }

  a {
    color: inherit;
    text-decoration: none;
  }

  .eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.28em;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--chip-fg);
  }

  .muted {
    color: var(--fg-muted);
  }

  .surface {
    background: var(--surface);
    border: none;
    border-radius: 1.75rem;
    box-shadow: none;
    backdrop-filter: none;
  }

  .surface-soft {
    background: var(--surface-soft);
    border: none;
    border-radius: 1.75rem;
    box-shadow: none;
  }

  :root[data-theme="dark"] .surface {
    background: var(--surface);
    box-shadow: none;
  }

  :root[data-theme="dark"] .surface-soft {
    background: var(--surface-soft);
    box-shadow: none;
  }

  .surface .surface-soft,
  .surface-soft .surface-soft {
    background: var(--surface-soft);
    box-shadow: none;
  }

  :root[data-theme="dark"] .surface .surface-soft,
  :root[data-theme="dark"] .surface-soft .surface-soft {
    background: var(--surface-soft);
    box-shadow: none;
  }

  .chip {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.9rem;
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 600;
    background: var(--chip-bg);
    color: var(--chip-fg);
    border: none;
    box-shadow: none;
  }

  :root[data-theme="dark"] .chip {
    background: var(--chip-bg);
    color: var(--chip-fg);
    box-shadow: none;
  }

  .accent-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.75rem 1.25rem;
    border-radius: 999px;
    font-weight: 600;
    color: #ffffff;
    background: var(--accent-mid);
    box-shadow: none;
    transition: background-color 0.15s ease, color 0.15s ease;
  }

  .accent-btn:hover {
    background: var(--accent-start);
  }

  .outline-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.75rem 1.25rem;
    border-radius: 999px;
    font-weight: 600;
    color: var(--fg-base);
    border: 1px solid var(--border);
    background: transparent;
    box-shadow: none;
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  }

  .outline-btn:hover {
    color: var(--accent-mid);
    border-color: var(--accent-mid);
    background-color: var(--surface-soft);
  }

  :root[data-theme="dark"] .outline-btn {
    background: transparent;
    box-shadow: none;
    color: var(--fg-base);
  }

  .theme-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.6rem 1.2rem;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--fg-base);
    box-shadow: none;
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  }

  .theme-toggle:hover {
    color: var(--accent-mid);
    border-color: var(--accent-mid);
    background-color: var(--surface-soft);
  }

  .theme-toggle svg {
    width: 1rem;
    height: 1rem;
    fill: none;
    stroke: var(--accent-mid);
  }

  :root[data-theme="dark"] .theme-toggle {
    background: var(--surface);
    color: var(--fg-base);
    box-shadow: none;
  }

  .brand-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.5rem 1.15rem;
    border-radius: 999px;
    border: none;
    background: var(--surface-soft);
    color: var(--accent-start);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    transition: color 0.15s ease, background 0.15s ease;
  }

  :root[data-theme="dark"] .brand-pill {
    background: var(--surface-soft);
    color: var(--fg-base);
  }

  .brand-pill:hover {
    color: var(--accent-mid);
  }

  .nav-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.45rem 0.95rem;
    border-radius: 0.85rem;
    border: 1px solid transparent;
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  }

  .nav-link:hover {
    background-color: var(--surface-soft);
    color: var(--accent-mid);
    border-color: var(--border);
  }

  .nav-link-active {
    background-color: var(--surface-soft);
    color: var(--accent-mid);
    border-color: var(--accent-mid);
  }

  :root[data-theme="dark"] .nav-link-active {
    background-color: var(--surface-soft);
    color: var(--accent-mid);
    border-color: var(--accent-mid);
  }

  :root[data-theme="dark"] .nav-link:hover {
    background-color: var(--surface-soft);
    color: var(--accent-mid);
    border-color: var(--border);
  }

  .hub-panel {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    width: 100%;
    gap: 0;
  }

  .panel-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.25rem 1.75rem;
    border-bottom: none;
    background: var(--surface-soft);
    box-shadow: none;
    transition: background-color 0.3s ease;
  }

  .workspace-gradient {
    background: var(--surface-soft);
    transition: background 0.35s ease;
  }

  :root[data-theme="dark"] .workspace-gradient {
    background: var(--surface-soft);
  }

  .drawer-panel {
    background: var(--surface-soft);
    border-top: none;
    backdrop-filter: none;
    box-shadow: none;
    transition: background-color 0.3s ease;
  }

  :root[data-theme="dark"] .panel-bar {
    background: var(--surface-soft);
    box-shadow: none;
  }

  :root[data-theme="dark"] .drawer-panel {
    background: var(--surface-soft);
    box-shadow: none;
  }

  .nav-toggle {
    width: 2.75rem;
    height: 2.75rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 1rem;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--fg-base);
    box-shadow: none;
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  }

  .nav-toggle:hover {
    color: var(--accent-mid);
    border-color: var(--accent-mid);
    background-color: var(--surface-soft);
  }

  :root[data-theme="dark"] .nav-toggle {
    background: var(--surface);
    box-shadow: none;
    color: var(--fg-base);
  }

  .header-bar {
    background: var(--surface);
    border-bottom: none;
    backdrop-filter: none;
    box-shadow: none;
  }

  :root[data-theme="dark"] .header-bar {
    background: var(--surface);
    border-bottom: none;
    box-shadow: none;
    backdrop-filter: none;
  }

  .footer-bar {
    background: var(--surface);
    border-top: none;
    box-shadow: none;
  }

  :root[data-theme="dark"] .footer-bar {
    background: var(--surface);
    border-top: none;
    box-shadow: none;
    backdrop-filter: none;
  }

  :root[data-theme="dark"] .header-bar .nav-link,
  :root[data-theme="dark"] .footer-bar .nav-link {
    color: var(--fg-base);
  }

  :root[data-theme="dark"] .header-bar .nav-link:hover,
  :root[data-theme="dark"] .footer-bar .nav-link:hover {
    color: var(--accent-mid);
  }

  :root[data-theme="dark"] .footer-bar .muted {
    color: var(--fg-muted);
  }

  @keyframes fade-up {
    0% {
      opacity: 0;
      transform: translateY(14px);
    }
    100% {
      opacity: 1;
      transform: translateY(0);
    }
  }

  @keyframes float-soft {
    0%,
    100% {
      transform: translateY(0);
    }
    50% {
      transform: translateY(0);
    }
  }

  @keyframes glow {
    0%,
    100% {
      box-shadow: none;
    }
    50% {
      box-shadow: none;
    }
  }

  .animate-fade-up {
    animation: fade-up 0.35s ease-out both;
  }

  .animate-fade-up-delay {
    animation: fade-up 0.45s ease-out 0.1s both;
  }

  .animate-float-soft {
    animation: none;
  }

  .animate-glow {
    animation: none;
  }

  .glow-shell {
    position: relative;
  }

  .glow-shell::before {
    content: "";
    position: absolute;
    inset: -60px;
    display: none;
  }

  .glow-shell > .surface {
    position: relative;
    z-index: 1;
  }

  .markdown p {
    margin: 0;
  }

  .markdown p + p {
    margin-top: 0.5rem;
  }

  .markdown ul,
  .markdown ol {
    margin: 0;
    padding-left: 1.2rem;
  }

  .markdown ul {
    list-style: disc;
  }

  .markdown ol {
    list-style: decimal;
  }

  .markdown li + li {
    margin-top: 0.35rem;
  }