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

:root {
  --bg: #0d1117;
  --surface: #161b22;
  --border: #30363d;
  --text: #c9d1d9;
  --muted: #8b949e;
  --accent: #58a6ff;
  --green: #3fb950;
  --red: #ff7b72;
  --yellow: #d29922;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
  height: 100vh;
}

/* ── Login Page ── */

.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(88, 166, 255, 0.06) 0%, transparent 60%),
    var(--bg);
}

.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 48px 40px;
  text-align: center;
  max-width: 520px;
  width: 90%;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.ascii-logo {
  font-family: monospace;
  font-size: 0.55rem;
  line-height: 1.1;
  color: var(--accent);
  white-space: pre;
  margin-bottom: 8px;
  user-select: none;
}

@media (max-width: 540px) {
  .ascii-logo { font-size: 0.38rem; }
  .login-card { padding: 32px 20px; }
}

.subtitle {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 36px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.google-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: #fff;
  color: #3c4043;
  border: none;
  border-radius: 8px;
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: box-shadow 0.2s, transform 0.1s;
}

.google-btn:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  transform: translateY(-1px);
}

.google-btn:active { transform: translateY(0); }
.google-btn svg { flex-shrink: 0; }

.error {
  margin-top: 24px;
  padding: 12px 16px;
  background: rgba(255, 123, 114, 0.08);
  border: 1px solid rgba(255, 123, 114, 0.25);
  border-radius: 8px;
  color: var(--red);
  font-size: 0.85rem;
}

/* ── Terminal Page ── */

.terminal-page {
  display: flex;
  flex-direction: column;
}

.terminal-header {
  display: flex;
  align-items: center;
  padding: 0 12px;
  height: 36px;
  min-height: 36px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  user-select: none;
  gap: 8px;
}

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

.header-title {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.25em;
  color: var(--accent);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--muted);
  transition: background 0.3s, box-shadow 0.3s;
}

.status-dot.connected {
  background: var(--green);
  box-shadow: 0 0 6px rgba(63, 185, 80, 0.5);
}

.status-dot.connecting, .status-dot.partial {
  background: var(--yellow);
  animation: pulse 1.5s infinite;
}

.status-dot.disconnected {
  background: var(--red);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.status-text {
  font-size: 0.6rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.user-info {
  font-size: 0.7rem;
  color: var(--muted);
}

.logout-btn {
  color: var(--muted);
  text-decoration: none;
  font-size: 1rem;
  padding: 2px 4px;
  border-radius: 4px;
  transition: color 0.2s, background 0.2s;
}

.logout-btn:hover {
  color: var(--red);
  background: rgba(255, 123, 114, 0.1);
}

.layout-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 1px 6px;
  border-radius: 4px;
  transition: color 0.2s, border-color 0.2s;
}

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

/* ── Tab Bar ── */

.tab-bar {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.tab-bar::-webkit-scrollbar { display: none; }

.tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px 6px 0 0;
  color: var(--muted);
  font-size: 0.68rem;
  font-family: monospace;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
}

.tab:hover { background: rgba(255,255,255, 0.04); }

.tab.active {
  background: var(--bg);
  color: var(--accent);
  border-color: var(--border);
  border-bottom-color: var(--bg);
}

.tab-close {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 0 2px;
  border-radius: 3px;
  line-height: 1;
  opacity: 0;
  transition: opacity 0.15s, color 0.15s;
}

.tab:hover .tab-close { opacity: 1; }
.tab-close:hover { color: var(--red); background: rgba(255,123,114,0.1); }

.split-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 1px 7px;
  border-radius: 4px;
  line-height: 1;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

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

.split-btn.active {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(88, 166, 255, 0.1);
}

.tab-add {
  background: none;
  border: 1px dashed var(--border);
  color: var(--muted);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 1px 8px;
  border-radius: 4px;
  margin-left: 2px;
  flex-shrink: 0;
  transition: color 0.15s, border-color 0.15s;
}

.tab-add:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* ── Pane Grid ── */

.pane-grid {
  flex: 1;
  display: grid;
  gap: 2px;
  background: var(--border);
  overflow: hidden;
}

.layout-single { grid-template: 1fr / 1fr; }
.layout-split-h { grid-template: 1fr / 1fr 1fr; }
.layout-split-v { grid-template: 1fr 1fr / 1fr; }
.layout-grid { grid-template: 1fr 1fr / 1fr 1fr; }

.layout-3 {
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
}

.layout-3 .pane-container:nth-child(3) {
  grid-column: 1 / -1;
}

.pane-container {
  background: var(--bg);
  padding: 2px;
  overflow: hidden;
  position: relative;
  min-width: 0;
  min-height: 0;
}

.pane-container.active {
  box-shadow: inset 0 0 0 1px rgba(88, 166, 255, 0.35);
}

.pane-container .xterm {
  height: 100%;
}

.pane-container .xterm-viewport {
  overflow-y: auto !important;
}

/* Scrollbar */
.pane-container .xterm-viewport::-webkit-scrollbar { width: 6px; }
.pane-container .xterm-viewport::-webkit-scrollbar-track { background: transparent; }
.pane-container .xterm-viewport::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}
.pane-container .xterm-viewport::-webkit-scrollbar-thumb:hover {
  background: var(--muted);
}

/* ── Drop Overlay ── */

.drop-overlay {
  position: fixed;
  inset: 0;
  background: rgba(13, 17, 23, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.drop-overlay.hidden { display: none; }

.drop-overlay-content {
  border: 2px dashed var(--accent);
  border-radius: 16px;
  padding: 48px 64px;
  color: var(--accent);
  font-size: 1.1rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ── Toast ── */

.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  padding: 8px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.78rem;
  z-index: 1001;
  transition: opacity 0.3s;
  pointer-events: none;
}

.toast.hidden { opacity: 0; }
.toast.error { border-color: var(--red); color: var(--red); }