:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --surface-hover: #f4f4f5;
  --surface-sunken: #f4f4f5;
  --ink: #18181b;
  --ink-soft: #71717a;
  --ink-faint: #a1a1aa;
  --border: #ececee;
  --border-strong: #dcdce0;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-soft: #eef2ff;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --success: #16a34a;
  --success-soft: #f0fdf4;
  --warning: #b45309;
  --warning-soft: #fffbeb;

  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", Consolas, monospace;

  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(24, 24, 27, 0.04);
  --shadow-md: 0 8px 24px rgba(24, 24, 27, 0.07), 0 1px 2px rgba(24, 24, 27, 0.04);
  --shadow-lg: 0 24px 64px rgba(24, 24, 27, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

[hidden] {
  display: none !important;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.brand-mark::before {
  content: "";
  width: 20px;
  height: 20px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent), #818cf8);
  flex-shrink: 0;
}

button {
  font-family: var(--font-body);
  cursor: pointer;
}

input,
select {
  font-family: var(--font-body);
  font-size: 0.95rem;
}

.btn-primary,
.btn-secondary {
  border-radius: var(--radius-sm);
  padding: 0.55rem 1.05rem;
  font-size: 0.87rem;
  font-weight: 500;
  border: 1px solid transparent;
  transition: background-color 0.12s ease, border-color 0.12s ease, color 0.12s ease, transform 0.12s ease;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-hover);
}
.btn-primary:active {
  transform: translateY(1px);
}

.btn-secondary {
  background: transparent;
  color: var(--ink-soft);
  border-color: var(--border-strong);
}
.btn-secondary:hover {
  background: var(--surface-hover);
  color: var(--ink);
  border-color: var(--border-strong);
}

.error-text {
  color: var(--danger);
  background: var(--danger-soft);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.8rem;
  font-size: 0.85rem;
}

.muted {
  color: var(--ink-faint);
}


.auth-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  background:
    radial-gradient(560px circle at 15% 10%, var(--accent-soft), transparent 60%),
    var(--bg);
}

.auth-card {
  width: 100%;
  max-width: 380px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 2.5rem 2.25rem;
  text-align: center;
}

.auth-card .brand-mark {
  justify-content: center;
  font-size: 1.15rem;
}

.auth-tagline {
  color: var(--ink-soft);
  margin: 0.5rem 0 2rem;
  font-size: 0.9rem;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  text-align: left;
}

.auth-form label {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--ink-soft);
}

.auth-form input {
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--ink);
  transition: border-color 0.12s ease, box-shadow 0.12s ease;
}

.auth-form input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.auth-form .btn-primary {
  margin-top: 0.35rem;
  padding-top: 0.7rem;
  padding-bottom: 0.7rem;
}

.auth-switch {
  text-align: center;
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin: 0.35rem 0 0;
}

.auth-switch a {
  color: var(--accent);
  font-weight: 500;
  text-decoration: none;
}
.auth-switch a:hover {
  text-decoration: underline;
}

#auth-error {
  margin-top: 1rem;
}


.app-header,
.editor-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.75rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.app-header-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.user-label {
  font-size: 0.86rem;
  color: var(--ink-soft);
}

.dashboard {
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.dashboard-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.75rem;
}

.dashboard-toolbar h1 {
  font-weight: 600;
  font-size: 1.4rem;
  letter-spacing: -0.01em;
  margin: 0;
}

.empty-state {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 4rem 1rem;
  text-align: center;
  color: var(--ink-soft);
  background: var(--surface);
}

.empty-state svg {
  color: var(--ink-faint);
  margin-bottom: 0.75rem;
}

.empty-state p {
  margin: 0;
  font-size: 0.92rem;
}

.doc-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.9rem;
}

.doc-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.15rem 1.25rem;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
}

.doc-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.doc-card-main {
  min-width: 0;
  flex: 1;
}

.doc-title {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  margin: 0 0 0.5rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.doc-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  font-size: 0.78rem;
  color: var(--ink-soft);
}

.doc-updated {
  font-family: var(--font-mono);
  color: var(--ink-faint);
}

.doc-card-actions {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  flex-shrink: 0;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  width: 28px;
  height: 28px;
  padding: 0;
  color: var(--ink-faint);
  transition: background-color 0.12s ease, color 0.12s ease;
}
.icon-btn:hover {
  background: var(--surface-hover);
  color: var(--ink);
}
.icon-btn svg {
  width: 15px;
  height: 15px;
}
.icon-btn.icon-btn-danger:hover {
  background: var(--danger-soft);
  color: var(--danger);
}

.role-badge {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  font-weight: 600;
  padding: 0.18rem 0.45rem;
  border-radius: 5px;
  background: var(--accent-soft);
  color: var(--accent);
}
.role-owner {
  background: var(--accent-soft);
  color: var(--accent);
}
.role-editor {
  background: var(--success-soft);
  color: var(--success);
}
.role-commenter {
  background: var(--warning-soft);
  color: var(--warning);
}
.role-viewer {
  background: var(--surface-sunken);
  color: var(--ink-soft);
}


dialog {
  border: none;
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 420px;
}
dialog::backdrop {
  background: rgba(24, 24, 27, 0.4);
  backdrop-filter: blur(2px);
}

.share-dialog h3 {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 1.1rem;
}

.share-form {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.share-form input {
  flex: 1;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  min-width: 0;
}
.share-form input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.share-form select {
  padding: 0.55rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.share-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  max-height: 220px;
  overflow-y: auto;
}

.share-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.87rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}
.share-list li:last-child {
  border-bottom: none;
}

.share-list .icon-btn {
  width: auto;
  height: auto;
  padding: 0.25rem 0.6rem;
  font-size: 0.76rem;
  color: var(--ink-soft);
  border: 1px solid var(--border-strong);
}
.share-list .icon-btn:hover {
  background: var(--danger-soft);
  color: var(--danger);
  border-color: var(--danger-soft);
}


.editor-body {
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.back-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 1.05rem;
  margin-right: 0.6rem;
  flex-shrink: 0;
  transition: background-color 0.12s ease, color 0.12s ease;
}
.back-link:hover {
  background: var(--surface-hover);
  color: var(--ink);
}

.editor-topbar {
  gap: 0.8rem;
}

.doc-title-input {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  border: none;
  background: transparent;
  color: var(--ink);
  flex: 1;
  min-width: 0;
  padding: 0.35rem 0.5rem;
  border-radius: var(--radius-sm);
}
.doc-title-input:hover:not(:disabled) {
  background: var(--surface-hover);
}
.doc-title-input:focus {
  outline: none;
  background: var(--surface-hover);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.doc-title-input:disabled {
  color: var(--ink-soft);
}

.editor-topbar-right {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-shrink: 0;
}

.presence-bar {
  display: flex;
}

.presence-dot {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid var(--surface);
  margin-left: -8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.68rem;
  font-weight: 600;
  font-family: var(--font-mono);
}
.presence-dot:first-child {
  margin-left: 0;
}

#save-status {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}
#save-status::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}
.status-ok {
  color: var(--success);
}
.status-pending {
  color: var(--ink-faint);
}

.activity-panel {
  position: absolute;
  top: 58px;
  right: 1.5rem;
  width: 280px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 1.1rem 1.15rem;
  z-index: 20;
  max-height: 320px;
  overflow-y: auto;
}
.activity-panel h3 {
  margin: 0 0 0.7rem;
  font-size: 0.92rem;
  font-weight: 600;
}
.activity-panel ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  font-size: 0.82rem;
  color: var(--ink-soft);
}

.editor-main {
  flex: 1;
  overflow-y: auto;
  background: var(--bg);
}

.editor-main .ql-toolbar {
  border: none;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 10;
  font-family: var(--font-body);
}

.editor-main .ql-container {
  border: none;
  font-family: var(--font-body);
  font-size: 1rem;
}

#editor {
  max-width: 760px;
  margin: 2.5rem auto 6rem;
  background: var(--surface);
  min-height: 70vh;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

#editor .ql-toolbar {
  padding: 0.7rem 1.25rem;
}

.editor-main .ql-editor {
  padding: 3.5rem 4rem;
  line-height: 1.7;
}
.editor-main .ql-editor.ql-blank::before {
  left: 4rem;
  font-style: normal;
  color: var(--ink-faint);
}

.ql-cursor-flag {
  font-family: var(--font-mono) !important;
  font-size: 0.7rem !important;
  border-radius: 4px !important;
  padding: 2px 6px !important;
}