:root {
  --bg: #ffffff;
  --panel: #fff5f5;
  --border: #f0c4c4;
  --text: #1a1414;
  --muted: #8a6f6f;
  --accent: #d81f2a;
  --accent-text: #ffffff;
  --danger: #b0121f;
}

* { box-sizing: border-box; }

.hidden { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, Segoe UI, Roboto, Arial, sans-serif;
}

/* ---------- auth screen ---------- */

.auth-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.auth-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  width: 100%;
  max-width: 420px;
}

.auth-card h1 {
  margin: 0 0 6px;
}

.muted {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.auth-tabs {
  display: flex;
  gap: 8px;
  margin: 18px 0;
}

.auth-tab {
  flex: 1;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px;
  border-radius: 6px;
  cursor: pointer;
}

.auth-tab.active {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}

#loginPane label, #registerPane label,
.modal-card label {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin: 10px 0 4px;
}

input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 9px 10px;
  border-radius: 6px;
  font-size: 15px;
  letter-spacing: 1px;
}

.error {
  color: var(--danger);
  font-size: 13px;
  margin-top: 8px;
  min-height: 16px;
}

/* ---------- modal ---------- */

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 20px;
}

.modal-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  width: 100%;
  max-width: 420px;
}

.modal-card h2 {
  margin-top: 0;
}

.code-value {
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 22px;
  letter-spacing: 2px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  text-align: center;
  margin: 16px 0;
  word-break: break-all;
}

.modal-actions {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

/* ---------- buttons ---------- */

button {
  background: var(--accent);
  color: var(--accent-text);
  border: none;
  padding: 9px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  margin-top: 10px;
}

button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

button.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

/* ---------- app shell ---------- */

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  border-bottom: 3px solid var(--accent);
  background: var(--panel);
}

header h1 {
  font-size: 18px;
  margin: 0;
  color: var(--accent);
  letter-spacing: 0.5px;
}

.auth-card h1 {
  color: var(--accent);
}

.header-right {
  display: flex;
  gap: 8px;
}

.header-right button {
  margin-top: 0;
  font-size: 13px;
  padding: 7px 12px;
}

main {
  display: grid;
  grid-template-columns: 140px 260px 1fr;
  height: calc(100vh - 57px);
}

#tabs {
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 10px;
  gap: 6px;
}

#tabs button {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  text-align: left;
  margin-top: 0;
  font-weight: 400;
}

#tabs button.active {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
  font-weight: 600;
}

.browser {
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.filelist-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
}

.filelist-head button {
  font-size: 12px;
  padding: 5px 8px;
  margin-top: 0;
}

#fileList {
  list-style: none;
  margin: 0;
  padding: 6px;
  overflow-y: auto;
}

#fileList li {
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  word-break: break-all;
}

#fileList li:hover {
  background: var(--panel);
}

#fileList li.active {
  background: var(--accent);
  color: var(--accent-text);
}

.editor {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.editor-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}

.editor-actions {
  display: flex;
  gap: 8px;
}

.editor-actions button {
  margin-top: 0;
}

#content {
  flex: 1;
  background: var(--bg);
  color: var(--text);
  border: none;
  padding: 16px;
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 14px;
  line-height: 1.5;
  resize: none;
  outline: none;
}

.editor-footer {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 14px;
  border-top: 1px solid var(--border);
}

.editor-footer button {
  margin-top: 0;
  font-size: 12px;
  padding: 6px 10px;
  flex-shrink: 0;
}

#status {
  font-size: 12px;
  color: var(--muted);
  min-height: 18px;
}