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

:root {
  --bg: #0d1117;
  --surface: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --danger: #f85149;
  --success: #3fb950;
  --warning: #d29922;
  --radius: 6px;
  --header-h: 48px;
  --toolbar-h: 36px;
}

html, body { height: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
}

.hidden { display: none !important; }

/* --- Login --- */

#login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background: var(--bg);
  padding: 16px;
}

.login-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 40px;
  width: 360px;
  max-width: 100%;
  text-align: center;
}

.login-box h1 {
  margin-bottom: 24px;
  font-size: 1.4rem;
  color: var(--accent);
}

.login-box input {
  display: block;
  width: 100%;
  padding: 10px 12px;
  margin-bottom: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 16px; /* prevent iOS zoom */
}

.login-box input:focus {
  outline: none;
  border-color: var(--accent);
}

.login-box button {
  width: 100%;
  padding: 12px;
  background: var(--accent);
  color: #000;
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
}

.login-box button:hover { background: var(--accent-hover); }

.error {
  color: var(--danger);
  font-size: 13px;
  margin-top: 8px;
}

/* --- Header --- */

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  height: var(--header-h);
  gap: 8px;
  flex-shrink: 0;
}

header h1 {
  font-size: 1rem;
  color: var(--accent);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  cursor: pointer;
  font-size: 18px;
  padding: 2px 8px;
  flex-shrink: 0;
}

/* Hide menu button on desktop */
#btn-menu { display: none; }

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.header-actions span {
  font-size: 12px;
  color: var(--text-muted);
}

#btn-settings, #btn-logout {
  padding: 4px 12px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 12px;
}

#btn-settings:hover {
  border-color: var(--accent);
  color: var(--accent);
}

#btn-logout:hover {
  border-color: var(--danger);
  color: var(--danger);
}

/* --- Modal --- */

#modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 16px;
}

.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  width: 380px;
  max-width: 100%;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.modal-header h2 {
  font-size: 1rem;
  color: var(--text);
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 20px;
  cursor: pointer;
  padding: 0 4px;
}

.modal-close:hover { color: var(--danger); }

.modal label {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 4px;
  margin-top: 12px;
}

.modal label:first-of-type { margin-top: 0; }

.modal input {
  display: block;
  width: 100%;
  padding: 8px 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 16px;
}

.modal input:focus {
  outline: none;
  border-color: var(--accent);
}

.modal button[type="submit"] {
  width: 100%;
  padding: 10px;
  margin-top: 16px;
  background: var(--accent);
  color: #000;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.modal button[type="submit"]:hover { background: var(--accent-hover); }

.success {
  color: var(--success);
  font-size: 13px;
  margin-top: 8px;
}

/* --- Main layout --- */

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh; /* dynamic viewport height for mobile */
}

.main-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
  position: relative;
}

/* --- Sidebar overlay (mobile) --- */

#sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 49;
}

/* --- Sidebar --- */

#sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  z-index: 50;
}

.panel {
  padding: 12px;
  border-bottom: 1px solid var(--border);
}

.panel h2 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.scroll-list {
  max-height: 200px;
  overflow-y: auto;
}

/* --- Folder browser --- */

#folder-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  margin-bottom: 6px;
  font-size: 12px;
}

.breadcrumb-item {
  color: var(--accent);
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 3px;
}

.breadcrumb-item:hover { background: rgba(88, 166, 255, 0.1); }
.breadcrumb-sep { color: var(--text-muted); padding: 2px 0; }

.folder-entry {
  display: flex;
  align-items: center;
  padding: 6px 8px;
  cursor: pointer;
  border-radius: var(--radius);
  font-size: 13px;
  gap: 6px;
}

.folder-entry:hover { background: rgba(255, 255, 255, 0.05); }
.folder-entry.selected { background: rgba(88, 166, 255, 0.15); color: var(--accent); }

.folder-icon { font-size: 14px; opacity: 0.7; }

.selected-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 8px;
  background: rgba(88, 166, 255, 0.1);
  border: 1px solid rgba(88, 166, 255, 0.3);
  border-radius: var(--radius);
  font-size: 12px;
  color: var(--accent);
  margin-top: 8px;
}

.selected-info button {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
}

.selected-info button:hover { color: var(--danger); }

/* --- Agent picker --- */

.agent-entry {
  display: flex;
  align-items: center;
  padding: 8px;
  cursor: pointer;
  border-radius: var(--radius);
  font-size: 13px;
  gap: 8px;
}

.agent-entry:hover { background: rgba(255, 255, 255, 0.05); }
.agent-entry.selected { background: rgba(88, 166, 255, 0.15); }

.agent-radio {
  width: 14px;
  height: 14px;
  border: 2px solid var(--border);
  border-radius: 50%;
  flex-shrink: 0;
}

.agent-entry.selected .agent-radio {
  border-color: var(--accent);
  background: var(--accent);
  box-shadow: inset 0 0 0 3px var(--surface);
}

.agent-name { font-weight: 500; }
.agent-desc { font-size: 11px; color: var(--text-muted); margin-top: 1px; }

/* --- Launch button --- */

.launch-btn {
  margin: 12px;
  padding: 12px;
  background: var(--success);
  color: #000;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.launch-btn:hover:not(:disabled) { filter: brightness(1.15); }
.launch-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* --- Sessions --- */

.session-entry {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px;
  cursor: pointer;
  border-radius: var(--radius);
  font-size: 12px;
  gap: 6px;
}

.session-entry:hover { background: rgba(255, 255, 255, 0.05); }
.session-entry.active { background: rgba(88, 166, 255, 0.15); }

.session-info {
  overflow: hidden;
  flex: 1;
}

.session-agent {
  font-weight: 500;
  font-size: 13px;
}

.session-folder {
  color: var(--text-muted);
  font-size: 11px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.session-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.session-status.alive { background: var(--success); }
.session-status.dead { background: var(--text-muted); }

.session-kill {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 16px;
  padding: 4px 6px;
  border-radius: 3px;
}

.session-kill:hover { color: var(--danger); background: rgba(248, 81, 73, 0.1); }

/* --- Terminal area --- */

#terminal-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: #000;
}

#terminal-placeholder {
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
  margin: auto;
}

/* --- Terminal toolbar --- */

#terminal-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 8px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  height: var(--toolbar-h);
  flex-shrink: 0;
}

#toolbar-session-name {
  font-size: 12px;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.toolbar-btn {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 12px;
  padding: 3px 8px;
  white-space: nowrap;
}

.toolbar-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.toolbar-right {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

#zoom-level {
  font-size: 11px;
  color: var(--text-muted);
  min-width: 36px;
  text-align: center;
}

/* Hide back button on desktop */
#btn-back { display: none; }

/* --- Terminal wrapper (zoom/pan) --- */

#terminal-wrapper {
  flex: 1;
  overflow: auto;
  position: relative;
  -webkit-overflow-scrolling: touch;
}

#terminal-container {
  padding: 4px;
  transform-origin: top left;
  min-height: 100%;
}

#terminal-container .xterm {
  height: 100%;
}

/* --- Scrollbar styling --- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ============================================
   MOBILE / TABLET  (max-width: 768px)
   ============================================ */

@media (max-width: 768px) {
  /* Show hamburger */
  #btn-menu { display: block; }

  /* Hide session count text on mobile */
  #session-count { display: none; }

  header h1 { font-size: 0.85rem; }

  /* Sidebar becomes slide-out drawer */
  #sidebar {
    position: fixed;
    top: var(--header-h);
    left: 0;
    bottom: 0;
    width: 85vw;
    max-width: 320px;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    box-shadow: 4px 0 20px rgba(0,0,0,0.5);
  }

  #sidebar.open {
    transform: translateX(0);
  }

  .scroll-list { max-height: none; }

  /* Show back button on mobile */
  #btn-back { display: block; }

  /* Terminal fills full area */
  #terminal-area {
    position: absolute;
    inset: 0;
  }

  /* When terminal is focused, it takes over the whole screen below header */
  body.terminal-focused #terminal-area {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 40;
  }

  /* Larger touch targets */
  .folder-entry { padding: 10px 8px; font-size: 14px; }
  .agent-entry { padding: 10px 8px; font-size: 14px; }
  .session-entry { padding: 10px 8px; }
  .session-kill { font-size: 20px; padding: 6px 10px; }
  .launch-btn { padding: 14px; font-size: 16px; }
  .breadcrumb-item { padding: 4px 6px; }

  /* Modal fullscreen on mobile */
  .modal {
    width: 100%;
    max-width: 100%;
    border-radius: 8px;
  }
}