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

:root {
  --bg-0:    #0d1117;
  --bg-1:    #161b22;
  --bg-2:    #21262d;
  --bg-3:    #2d333b;
  --bg-4:    #30363d;
  --border:  #30363d;
  --text-1:  #e6edf3;
  --text-2:  #8b949e;
  --text-3:  #6e7681;
  --accent:  #58a6ff;
  --accent-d:#1f6feb;
  --success: #3fb950;
  --warn:    #d29922;
  --danger:  #f85149;
  --claude:  #d97706;

  --sidebar-w: 220px;
  --panel-w:   244px;
  --header-h:  44px;
  --tab-h:     36px;
}

html, body {
  height: 100%; overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
               'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  font-size: 13px;
  background: var(--bg-0);
  color: var(--text-1);
  line-height: 1.4;
}

/* ─── Header ───────────────────────────────────────────────────────────────── */
#header {
  height: var(--header-h);
  background: var(--bg-1);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center;
  padding: 0 14px; gap: 8px;
  flex-shrink: 0; z-index: 100;
}

.logo {
  font-size: 15px; font-weight: 700;
  letter-spacing: -0.3px; white-space: nowrap;
  margin-right: 6px;
}
.logo span { color: var(--claude); }

.header-actions { display: flex; gap: 6px; flex: 1; }

.header-btn {
  height: 26px; padding: 0 10px;
  border: 1px solid var(--border); border-radius: 5px;
  background: var(--bg-2); color: var(--text-1);
  font-size: 12px; cursor: pointer;
  display: flex; align-items: center; gap: 4px;
  white-space: nowrap;
  transition: background .15s, border-color .15s;
}
.header-btn:hover   { background: var(--bg-4); border-color: var(--accent); }
.header-btn.primary { border-color: var(--claude); color: var(--claude); }
.header-btn.primary:hover { background: rgba(217,119,6,.18); }

#conn-status {
  font-size: 11px; padding: 2px 10px;
  border-radius: 10px; white-space: nowrap; margin-left: auto;
  transition: background .3s, color .3s;
}
.status-connected    { background: rgba(63,185,80,.18);  color: var(--success); }
.status-disconnected { background: rgba(248,81,73,.18);  color: var(--danger);  }
.status-connecting   { background: rgba(210,153,34,.18); color: var(--warn);    }

/* ─── Main Layout ──────────────────────────────────────────────────────────── */
#main {
  display: flex;
  height: calc(100vh - var(--header-h));
  overflow: hidden;
}

/* ─── Sidebar ──────────────────────────────────────────────────────────────── */
#sidebar {
  width: var(--sidebar-w); flex-shrink: 0;
  background: var(--bg-1); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; overflow: hidden;
  user-select: none;
}

.sidebar-tabs {
  display: flex; flex-shrink: 0;
  border-bottom: 1px solid var(--border);
}
.sidebar-tab {
  flex: 1; height: 32px;
  background: transparent; border: none;
  color: var(--text-2); font-size: 12px; cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color .15s;
}
.sidebar-tab:hover         { color: var(--text-1); }
.sidebar-tab.active        { color: var(--text-1); border-bottom-color: var(--accent); }

.sidebar-panel             { display: none; flex-direction: column; flex: 1; overflow: hidden; }
.sidebar-panel.active      { display: flex; }

.panel-header {
  display: flex; align-items: center; gap: 4px;
  padding: 5px 10px;
  font-size: 10px; font-weight: 700;
  color: var(--text-2); text-transform: uppercase; letter-spacing: .8px;
  border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.panel-header span { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.panel-header button {
  width: 18px; height: 18px;
  background: transparent; border: none;
  color: var(--text-2); cursor: pointer;
  border-radius: 3px; font-size: 13px;
  display: flex; align-items: center; justify-content: center;
}
.panel-header button:hover { background: var(--bg-4); color: var(--text-1); }

/* File Tree */
#file-tree { overflow-y: auto; flex: 1; padding: 2px 0; }
#file-tree::-webkit-scrollbar        { width: 4px; }
#file-tree::-webkit-scrollbar-thumb  { background: var(--bg-4); border-radius: 2px; }

.tree-item {
  display: flex; align-items: center; gap: 5px;
  padding: 3px 12px; cursor: pointer;
  font-size: 12px; color: var(--text-2);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  transition: background .1s, color .1s;
}
.tree-item:hover     { background: var(--bg-3); color: var(--text-1); }
.tree-item.dir       { color: var(--text-1); font-weight: 500; }
.tree-item .icon     { flex-shrink: 0; width: 16px; text-align: center; }
.tree-item > span:last-child { overflow: hidden; text-overflow: ellipsis; }
.tree-info { padding: 10px 12px; color: var(--text-3); font-size: 12px; font-style: italic; }

/* SSH List */
#ssh-list { overflow-y: auto; flex: 1; }
.ssh-item {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  cursor: pointer; transition: background .1s;
}
.ssh-item:hover         { background: var(--bg-3); }
.ssh-item-name          { font-size: 12px; color: var(--text-1); font-weight: 600; }
.ssh-item-host          { font-size: 11px; color: var(--text-3); margin-top: 2px; }
.ssh-item-actions       { display: flex; gap: 4px; margin-top: 5px; }
.ssh-item-btn {
  font-size: 10px; padding: 2px 7px;
  border: 1px solid var(--border); border-radius: 3px;
  background: transparent; color: var(--text-2); cursor: pointer;
  transition: background .1s, color .1s;
}
.ssh-item-btn:hover        { background: var(--bg-4); color: var(--text-1); }
.ssh-item-btn.connect      { border-color: var(--success); color: var(--success); }
.ssh-item-btn.connect:hover{ background: rgba(63,185,80,.15); }
.ssh-item-btn.del          { border-color: var(--danger); color: var(--danger); }
.ssh-item-btn.del:hover    { background: rgba(248,81,73,.15); }
.ssh-empty {
  padding: 24px 14px; text-align: center;
  color: var(--text-3); font-size: 12px;
}
.ssh-empty p           { margin-bottom: 10px; }
.ssh-empty button {
  padding: 5px 12px;
  border: 1px solid var(--accent); border-radius: 4px;
  background: transparent; color: var(--accent);
  cursor: pointer; font-size: 11px;
}
.ssh-empty button:hover { background: rgba(88,166,255,.15); }

/* ─── Terminal Area ─────────────────────────────────────────────────────────── */
#terminal-area {
  flex: 1; display: flex; flex-direction: column;
  overflow: hidden; min-width: 0;
}

#tab-bar {
  height: var(--tab-h);
  background: var(--bg-1); border-bottom: 1px solid var(--border);
  display: flex; align-items: stretch;
  overflow-x: auto; overflow-y: hidden; flex-shrink: 0;
}
#tab-bar::-webkit-scrollbar        { height: 3px; }
#tab-bar::-webkit-scrollbar-thumb  { background: var(--bg-4); }
#tab-list { display: flex; align-items: stretch; flex: 1; }

.tab {
  display: flex; align-items: center; gap: 6px;
  padding: 0 12px; height: var(--tab-h);
  min-width: 90px; max-width: 160px;
  background: var(--bg-2); border-right: 1px solid var(--border);
  font-size: 12px; color: var(--text-2);
  cursor: pointer; user-select: none; white-space: nowrap;
  transition: color .15s; position: relative;
}
.tab:hover          { color: var(--text-1); }
.tab.active {
  background: var(--bg-0); color: var(--text-1);
  border-top: 2px solid var(--accent);
}
.tab.type-ssh.active    { border-top-color: var(--success); }
.tab.type-claude.active { border-top-color: var(--claude);  }

.tab-icon     { flex-shrink: 0; font-size: 11px; }
.tab-name     { flex: 1; overflow: hidden; text-overflow: ellipsis; }
.tab-close {
  width: 16px; height: 16px; border-radius: 3px;
  background: transparent; border: none;
  color: var(--text-3); cursor: pointer; font-size: 11px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; opacity: 0;
  transition: opacity .15s, background .1s, color .1s;
}
.tab:hover .tab-close   { opacity: 1; }
.tab-close:hover { background: rgba(248,81,73,.3); color: var(--danger); }

#btn-add-tab {
  width: 36px; height: var(--tab-h); flex-shrink: 0;
  background: transparent; border: none;
  border-left: 1px solid var(--border);
  color: var(--text-2); cursor: pointer; font-size: 18px;
  transition: color .15s, background .15s;
}
#btn-add-tab:hover { color: var(--text-1); background: var(--bg-3); }

#terminal-container {
  flex: 1; position: relative; overflow: hidden;
  background: var(--bg-0);
}
.terminal-wrapper {
  position: absolute; inset: 0;
  display: none; padding: 4px;
}
.terminal-wrapper.active { display: block; }

/* xterm overrides */
.xterm             { height: 100%; }
.xterm-viewport::-webkit-scrollbar       { width: 6px; }
.xterm-viewport::-webkit-scrollbar-thumb { background: var(--bg-4); border-radius: 3px; }

/* Empty State */
#empty-state {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 14px; color: var(--text-3);
}
.empty-icon    { font-size: 48px; }
#empty-state p { font-size: 14px; }
.empty-btns    { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
.empty-btns button {
  padding: 8px 18px;
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--bg-2); color: var(--text-2);
  cursor: pointer; font-size: 13px;
  transition: background .15s, border-color .15s, color .15s;
}
.empty-btns button:hover   { background: var(--bg-4); color: var(--text-1); border-color: var(--accent); }
.empty-btns button.primary { border-color: var(--claude); color: var(--claude); }
.empty-btns button.primary:hover { background: rgba(217,119,6,.18); }

/* ─── Claude Panel ─────────────────────────────────────────────────────────── */
#claude-panel {
  width: var(--panel-w); flex-shrink: 0;
  background: var(--bg-1); border-left: 1px solid var(--border);
  overflow-y: auto; display: flex; flex-direction: column;
}
#claude-panel::-webkit-scrollbar       { width: 4px; }
#claude-panel::-webkit-scrollbar-thumb { background: var(--bg-4); border-radius: 2px; }

.panel-title {
  padding: 10px 12px;
  font-size: 12px; font-weight: 700;
  color: var(--claude); letter-spacing: .5px;
  border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.claude-section {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
}
.section-title {
  font-size: 10px; font-weight: 700;
  color: var(--text-3); text-transform: uppercase;
  letter-spacing: .8px; margin-bottom: 6px;
}
.claude-btn {
  display: block; width: 100%;
  padding: 6px 8px; margin-bottom: 4px;
  border: 1px solid var(--border); border-radius: 4px;
  background: var(--bg-2); color: var(--text-2);
  font-size: 11px; cursor: pointer; text-align: left;
  transition: background .15s, color .15s, border-color .15s;
}
.claude-btn:last-child { margin-bottom: 0; }
.claude-btn:hover      { background: var(--bg-4); color: var(--text-1); border-color: var(--claude); }
.claude-btn.primary    {
  border-color: var(--claude); color: var(--claude);
  font-weight: 700; background: rgba(217,119,6,.08);
}
.claude-btn.primary:hover { background: rgba(217,119,6,.22); }

.custom-cmd { display: flex; flex-direction: column; gap: 6px; }
.custom-cmd textarea {
  width: 100%; min-height: 72px; resize: vertical;
  background: var(--bg-2); border: 1px solid var(--border);
  border-radius: 4px; color: var(--text-1);
  font-size: 12px; padding: 6px 8px; font-family: inherit;
  outline: none; transition: border-color .15s;
}
.custom-cmd textarea:focus       { border-color: var(--accent); }
.custom-cmd textarea::placeholder{ color: var(--text-3); }
.custom-cmd button {
  align-self: flex-end; padding: 5px 16px;
  border: 1px solid var(--accent); border-radius: 4px;
  background: rgba(88,166,255,.1); color: var(--accent);
  font-size: 12px; cursor: pointer; font-weight: 600;
  transition: background .15s;
}
.custom-cmd button:hover { background: rgba(88,166,255,.25); }

/* ─── Modal ─────────────────────────────────────────────────────────────────── */
.modal {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.65);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000; backdrop-filter: blur(2px);
}
.modal.hidden { display: none; }

.modal-content {
  background: var(--bg-1); border: 1px solid var(--border);
  border-radius: 8px; width: 460px;
  max-width: 92vw; max-height: 90vh; overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,.6);
}
.modal-header {
  display: flex; align-items: center;
  padding: 14px 16px; border-bottom: 1px solid var(--border);
}
.modal-header h3 { flex: 1; font-size: 14px; font-weight: 700; }
.modal-close {
  width: 26px; height: 26px;
  background: transparent; border: none;
  color: var(--text-2); cursor: pointer; border-radius: 4px;
  font-size: 13px; display: flex; align-items: center; justify-content: center;
}
.modal-close:hover { background: var(--bg-4); color: var(--text-1); }

.modal-body   { padding: 16px; display: flex; flex-direction: column; gap: 14px; }
.modal-footer {
  padding: 12px 16px; border-top: 1px solid var(--border);
  display: flex; justify-content: flex-end; gap: 8px;
}

.form-group         { display: flex; flex-direction: column; gap: 5px; }
.form-group label   { font-size: 12px; color: var(--text-2); font-weight: 500; }
.form-group input, .form-group textarea {
  background: var(--bg-2); border: 1px solid var(--border);
  border-radius: 5px; color: var(--text-1);
  padding: 8px 10px; font-size: 13px; outline: none;
  font-family: inherit; transition: border-color .15s;
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--accent); }
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--text-3); }

.form-row  { display: flex; gap: 10px; }
.flex-1    { flex: 1; }
.w-80      { width: 82px; flex-shrink: 0; }
.required  { color: var(--danger); }

.radio-group { display: flex; gap: 20px; }
.radio-group label {
  display: flex; align-items: center; gap: 5px;
  font-size: 12px; color: var(--text-2); cursor: pointer;
}
.radio-group input[type="radio"] { cursor: pointer; }

.checkbox-label {
  display: flex; align-items: center; gap: 6px;
  font-size: 12px; color: var(--text-2); cursor: pointer;
}
.checkbox-label input { cursor: pointer; }

.btn-cancel, .btn-connect {
  padding: 8px 18px; border-radius: 5px;
  font-size: 13px; cursor: pointer; font-weight: 600;
  transition: background .15s;
}
.btn-cancel {
  background: transparent; border: 1px solid var(--border);
  color: var(--text-2);
}
.btn-cancel:hover  { background: var(--bg-4); color: var(--text-1); }
.btn-connect {
  background: var(--accent-d); border: 1px solid var(--accent);
  color: #fff;
}
.btn-connect:hover { background: var(--accent); }

/* ─── Notifications ─────────────────────────────────────────────────────────── */
#notification {
  position: fixed; bottom: 20px; right: 20px;
  z-index: 2000; display: flex; flex-direction: column;
  gap: 8px; pointer-events: none;
}
.notif {
  padding: 10px 16px; border-radius: 6px;
  font-size: 13px; max-width: 320px;
  border: 1px solid; pointer-events: auto;
  animation: slideIn .2s ease-out;
}
.notif-info    { background: rgba(88,166,255,.15); border-color: var(--accent); color: var(--accent); }
.notif-success { background: rgba(63,185,80,.15);  border-color: var(--success); color: var(--success); }
.notif-error   { background: rgba(248,81,73,.15);  border-color: var(--danger); color: var(--danger); }
.notif-warning { background: rgba(210,153,34,.15); border-color: var(--warn); color: var(--warn); }

@keyframes slideIn {
  from { transform: translateX(110%); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}

/* ─── Utilities ─────────────────────────────────────────────────────────────── */
.hidden { display: none !important; }

* { scrollbar-width: thin; scrollbar-color: var(--bg-4) transparent; }