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

:root {
  --bg:        #0d1117;
  --surface:   #161b22;
  --border:    #30363d;
  --text:      #c9d1d9;
  --text-dim:  #8b949e;
  --accent:    #58a6ff;
  --active-bg: #1f2937;
  --active-fg: #e6edf3;
  --code-bg:   #1e2432;
  --danger:    #f85149;
  --sidebar-w: 260px;
  --topbar-h:  48px;
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    'Helvetica Neue', Arial, sans-serif;
  background: var(--bg); color: var(--text); font-size: 15px; line-height: 1.6;
}

/* ── Login page ──────────────────────────────────────────────────────────── */
.login-page {
  display: flex; align-items: center; justify-content: center; min-height: 100vh;
}

.login-box {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; padding: 2.5rem 2rem; width: 320px;
  display: flex; flex-direction: column; gap: 1.2rem;
}

.login-logo { font-size: 1.5rem; font-weight: 700; color: var(--accent); text-align: center; }

.login-box label { display: block; font-size: 0.85rem; color: var(--text-dim); margin-bottom: 0.3rem; }

.login-box input[type="password"] {
  width: 100%; padding: 0.6rem 0.8rem;
  background: var(--bg); border: 1px solid var(--border); border-radius: 6px;
  color: var(--text); font-size: 1rem; outline: none; transition: border-color 0.15s;
}
.login-box input[type="password"]:focus { border-color: var(--accent); }

.login-box button[type="submit"] {
  width: 100%; padding: 0.65rem; margin-top: 0.4rem;
  background: var(--accent); color: #000; font-weight: 600; font-size: 1rem;
  border: none; border-radius: 6px; cursor: pointer; transition: opacity 0.15s;
}
.login-box button[type="submit"]:hover { opacity: 0.85; }

.error { color: var(--danger); font-size: 0.9rem; text-align: center; }

/* ── Viewer layout ───────────────────────────────────────────────────────── */
.viewer-page { display: flex; height: 100vh; overflow: hidden; }

/* Sidebar */
.sidebar {
  width: var(--sidebar-w); flex-shrink: 0;
  background: var(--surface); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; overflow: hidden;
  transition: transform 0.25s ease;
  z-index: 200;
}

.sidebar-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.75rem 1rem; border-bottom: 1px solid var(--border); flex-shrink: 0;
}

.logo { font-weight: 700; color: var(--accent); font-size: 1rem; }

.header-actions { display: flex; align-items: center; gap: 0.5rem; }

.logout-btn {
  background: none; border: 1px solid var(--border); color: var(--text-dim);
  border-radius: 5px; padding: 0.25rem 0.6rem; font-size: 0.8rem;
  cursor: pointer; transition: color 0.15s, border-color 0.15s;
}
.logout-btn:hover { color: var(--danger); border-color: var(--danger); }

/* Close button (mobile only) */
.close-btn {
  display: none; background: none; border: none; color: var(--text-dim);
  font-size: 1.1rem; cursor: pointer; padding: 0.2rem 0.4rem; line-height: 1;
}

/* Tabs */
.sidebar-tabs {
  display: flex; flex-shrink: 0; border-bottom: 1px solid var(--border);
}
.tab {
  flex: 1; padding: 0.55rem 0; text-align: center;
  font-size: 0.78rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--text-dim); text-decoration: none;
  border-bottom: 2px solid transparent; transition: color 0.15s, border-color 0.15s;
}
.tab:hover { color: var(--text); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }

.file-tree { overflow-y: auto; flex: 1; padding: 0.5rem 0; }

.dir-label {
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--text-dim); padding: 0.9rem 1rem 0.3rem;
}

.file-link {
  display: block; padding: 0.3rem 1rem;
  color: var(--text); text-decoration: none; font-size: 0.875rem;
  border-left: 3px solid transparent; transition: background 0.1s, color 0.1s;
  word-break: break-word;
}
.file-link:hover { background: var(--active-bg); color: var(--active-fg); }
.file-link.active { background: var(--active-bg); color: var(--accent); border-left-color: var(--accent); }

.sidebar-empty { padding: 1rem; color: var(--text-dim); font-size: 0.85rem; font-style: italic; }

/* Main wrap + topbar */
.main-wrap { flex: 1; display: flex; flex-direction: column; overflow: hidden; min-width: 0; }

.topbar {
  display: none; /* hidden on desktop */
  align-items: center; gap: 0.75rem;
  height: var(--topbar-h); padding: 0 1rem; flex-shrink: 0;
  background: var(--surface); border-bottom: 1px solid var(--border);
}

.menu-btn {
  background: none; border: none; color: var(--text); font-size: 1.3rem;
  cursor: pointer; padding: 0.2rem 0.3rem; line-height: 1;
}

.topbar-title { font-weight: 700; color: var(--accent); }

/* Content */
.content { flex: 1; overflow-y: auto; padding: 2rem 2.5rem; background: var(--bg); }

/* Artifact iframe fills the content area */
body[data-tab="artifacts"] .content { padding: 0; overflow: hidden; }
body[data-tab="artifacts"] .markdown-body { max-width: none; height: 100%; display: flex; flex-direction: column; }

.artifact-frame { flex: 1; width: 100%; border: none; display: block; }

.empty { color: var(--text-dim); font-style: italic; }

/* Mobile overlay */
.sidebar-overlay {
  display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5);
  z-index: 199; opacity: 0; transition: opacity 0.25s;
}
.sidebar-overlay.show { display: block; opacity: 1; }

/* ── Markdown body ───────────────────────────────────────────────────────── */
.markdown-body { max-width: 800px; }

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  color: var(--active-fg); margin: 1.5em 0 0.5em; line-height: 1.3; padding-bottom: 0.2em;
}
.markdown-body h1 { font-size: 1.9rem; border-bottom: 1px solid var(--border); }
.markdown-body h2 { font-size: 1.45rem; border-bottom: 1px solid var(--border); }
.markdown-body h3 { font-size: 1.15rem; }

.markdown-body p { margin: 0.8em 0; }
.markdown-body a { color: var(--accent); text-decoration: none; }
.markdown-body a:hover { text-decoration: underline; }
.markdown-body ul, .markdown-body ol { margin: 0.6em 0 0.6em 1.5em; }
.markdown-body li { margin: 0.25em 0; }

.markdown-body blockquote {
  border-left: 4px solid var(--border); padding: 0.2em 1em;
  color: var(--text-dim); margin: 1em 0;
}

.markdown-body code {
  background: var(--code-bg); border-radius: 4px; padding: 0.15em 0.4em;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 0.88em; color: #e06c75;
}

.markdown-body pre {
  background: var(--code-bg); border: 1px solid var(--border);
  border-radius: 6px; padding: 1em; overflow-x: auto; margin: 1em 0;
}
.markdown-body pre code { background: none; padding: 0; color: var(--text); font-size: 0.88em; }

.markdown-body table { border-collapse: collapse; width: 100%; margin: 1em 0; }
.markdown-body th, .markdown-body td {
  border: 1px solid var(--border); padding: 0.5em 0.8em; text-align: left;
}
.markdown-body th { background: var(--surface); color: var(--active-fg); }
.markdown-body tr:nth-child(even) { background: var(--surface); }
.markdown-body hr { border: none; border-top: 1px solid var(--border); margin: 1.5em 0; }
.markdown-body img { max-width: 100%; border-radius: 4px; }

/* ── Mobile ──────────────────────────────────────────────────────────────── */
@media (max-width: 700px) {
  .sidebar {
    position: fixed; top: 0; left: 0; bottom: 0;
    transform: translateX(-100%);
  }
  .sidebar.open { transform: translateX(0); }

  .close-btn { display: block; }

  .topbar { display: flex; }

  .content { padding: 1rem; }

  body[data-tab="artifacts"] .content { padding: 0; }

  .markdown-body h1 { font-size: 1.4rem; }
  .markdown-body h2 { font-size: 1.2rem; }
}

/* ── Scrollbar styling ───────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }