:root {
  --bg: #F1F3F6;
  --sidebar-bg: #FFFFFF;
  --surface: #FFFFFF;
  --surface-raised: #F5F7FA;
  --line: #E3E6EC;
  --text: #1B1F27;
  --text-muted: #6B7280;
  --signal: #2A5BD7;
  --signal-contrast: #FFFFFF;
  --signal-tint: #EAF0FD;
  --ok: #1F9D55;
  --danger: #D64545;
  --font-ui: 'IBM Plex Sans', system-ui, sans-serif;
  --font-code: 'IBM Plex Mono', monospace;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.06), 0 1px 2px rgba(16, 24, 40, 0.04);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
}

/* ---------- Shell layout ---------- */
.shell {
  grid-template-columns: 220px 1fr;
  min-height: 100vh;
}
.shell:not([hidden]) {
  display: grid;
}

.sidebar {
  background: var(--sidebar-bg);
  border-right: 1px solid var(--line);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 0 8px;
  margin-bottom: 32px;
}
.brand-mark {
  width: 13px;
  height: 13px;
  background: var(--signal);
  border-radius: 3px;
  transform: rotate(45deg);
  flex-shrink: 0;
}
.brand-name {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.nav { display: flex; flex-direction: column; gap: 2px; }
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-ui);
  font-size: 14px;
  padding: 9px 10px;
  border-radius: 6px;
  cursor: pointer;
  text-align: left;
  width: 100%;
}
.nav-item:hover { background: var(--surface-raised); color: var(--text); }
.nav-item.active { background: var(--signal-tint); color: var(--signal); }
.logout-btn { margin-top: auto; }
.logout-btn:hover { color: var(--danger); background: #FDF2F2; }

.main { padding: 32px 40px 80px; max-width: 980px; }

/* ---------- Topbar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  gap: 16px;
  flex-wrap: wrap;
}
.topbar h1 { font-size: 24px; margin: 0; font-weight: 700; }
.topbar-actions { display: flex; align-items: center; gap: 12px; }

.search {
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 12px;
  color: var(--text-muted);
}
.search:not([hidden]) {
  display: flex;
}
.search input {
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 14px;
  width: 180px;
}

.btn-primary {
  background: var(--signal);
  color: var(--signal-contrast);
  border: none;
  border-radius: 6px;
  padding: 10px 18px;
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
}
.btn-primary:hover { filter: brightness(0.92); }
.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 16px;
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
}
.btn-secondary:hover { border-color: var(--signal); color: var(--signal); }
.btn-ghost {
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-ui);
  font-size: 14px;
  cursor: pointer;
  padding: 10px 12px;
}
.btn-ghost:hover { color: var(--text); }
.btn-delete {
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--danger);
  border-radius: 6px;
  padding: 10px 16px;
  font-family: var(--font-ui);
  font-size: 14px;
  cursor: pointer;
}
.btn-delete:hover { border-color: var(--danger); background: #FDF2F2; }

/* ---------- Creator ---------- */
.creator {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 22px;
  margin-bottom: 28px;
  box-shadow: var(--shadow);
}
.creator form {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 14px;
}
.field-wide { grid-column: 1 / -1; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 12.5px; color: var(--text-muted); }
.field input {
  background: var(--surface-raised);
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--text);
  padding: 10px 12px;
  font-family: var(--font-code);
  font-size: 14px;
  outline: none;
}
.field input:focus { border-color: var(--signal); background: var(--surface); }
.creator-buttons {
  grid-column: 1 / -1;
  display: flex;
  gap: 10px;
  align-items: center;
}
.creator-note {
  margin: 14px 2px 0;
  font-size: 13px;
  color: var(--text-muted);
}
.domain-form {
  display: flex;
  gap: 14px;
  align-items: end;
  flex-wrap: wrap;
}
.domain-form .field-wide { flex: 1; min-width: 220px; }

/* ---------- List ---------- */
.empty-state {
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 44px 24px;
  text-align: center;
  color: var(--text-muted);
  background: var(--surface);
}
.empty-state p { margin: 0 0 4px; }
.empty-sub { font-size: 13px; }

.link-list {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.link-row {
  display: grid;
  grid-template-columns: 48px 1fr auto;
  gap: 16px;
  align-items: center;
  padding: 18px 20px;
  border-bottom: 1px solid var(--line);
}
.link-row:last-child { border-bottom: none; }

.row-icon {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--signal-tint);
  color: var(--signal);
  flex-shrink: 0;
}
.row-icon.qr-thumb {
  background: #fff;
  padding: 4px;
  border: 1px solid var(--line);
}
.row-icon.qr-thumb img { width: 100%; height: 100%; display: block; }

.row-info { min-width: 0; }
.row-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 3px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text);
}
.row-short {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-code);
  color: var(--signal);
  font-size: 13.5px;
  margin-bottom: 3px;
}
.row-short button {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
}
.row-short button:hover { color: var(--signal); }
.row-dest {
  font-size: 12.5px;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  display: flex;
  gap: 4px;
}
.row-meta {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-top: 8px;
  flex-wrap: wrap;
}
.tag-pill {
  font-size: 11px;
  padding: 2px 9px;
  border-radius: 20px;
  background: var(--surface-raised);
  color: var(--text-muted);
  border: 1px solid var(--line);
}
.tag-pill.domain-pill {
  background: var(--signal-tint);
  color: var(--signal);
  border-color: var(--signal);
  font-family: var(--font-code);
}
.row-date {
  font-size: 11.5px;
  color: var(--text-muted);
}
.row-clicks {
  font-size: 11.5px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}
.row-clicks strong { color: var(--text); }

.row-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}
.icon-btn {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  border-radius: 6px;
  color: var(--text-muted);
  cursor: pointer;
}
.icon-btn:hover { background: var(--signal-tint); color: var(--signal); }
.icon-btn.danger:hover { background: #FDF2F2; color: var(--danger); }

/* ---------- Modal ---------- */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(27, 31, 39, 0.45);
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 10;
}
.modal:not([hidden]) { display: flex; }

.modal-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 28px;
  width: 100%;
  max-width: 440px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 10px 30px rgba(16, 24, 40, 0.15);
}
.modal-close {
  position: absolute;
  top: 14px;
  right: 16px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 22px;
  cursor: pointer;
  line-height: 1;
}
.modal-close:hover { color: var(--text); }
.modal-qr-wrap {
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}
.modal-qr-wrap:not([hidden]) {
  display: flex;
}
.modal-qr-wrap img {
  width: 160px;
  height: 160px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px;
}
.modal-card h3 { margin: 0 0 4px; font-size: 17px; }
.modal-slug {
  font-family: var(--font-code);
  color: var(--signal);
  margin: 0 0 18px;
  font-size: 13.5px;
}
.modal-card label {
  font-size: 12.5px;
  color: var(--text-muted);
  display: block;
  margin-bottom: 6px;
  margin-top: 14px;
}
.modal-card label:first-of-type { margin-top: 0; }
.modal-card input {
  width: 100%;
  background: var(--surface-raised);
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--text);
  padding: 10px 12px;
  font-family: var(--font-code);
  font-size: 14px;
  outline: none;
}
.modal-card input:focus { border-color: var(--signal); background: var(--surface); }
.modal-stats {
  display: flex;
  gap: 20px;
  padding: 14px 0;
  margin-top: 18px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  color: var(--text-muted);
}
.modal-stats strong { color: var(--text); display: block; font-size: 18px; font-family: var(--font-code); }
.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 18px;
  flex-wrap: wrap;
}

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  border: 1px solid var(--text);
  color: #fff;
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 13.5px;
  z-index: 20;
  box-shadow: 0 10px 30px rgba(16, 24, 40, 0.2);
}

@media (max-width: 800px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--line);
    padding: 14px 16px;
  }
  .nav { flex-direction: row; }
  .main { padding: 20px; }
  .creator form { grid-template-columns: 1fr; }
  .link-row { grid-template-columns: 40px 1fr; }
  .row-actions { grid-column: 1 / -1; justify-content: flex-start; }
}

/* ---------- Auth screen ---------- */
.auth-screen {
  min-height: 100vh;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  padding: 20px;
}
.auth-screen:not([hidden]) {
  display: flex;
}
.auth-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 36px;
  width: 100%;
  max-width: 380px;
  box-shadow: var(--shadow);
}
.auth-brand {
  margin-bottom: 28px;
  justify-content: center;
}
.auth-brand .brand-name { font-size: 19px; }
.auth-card h2 {
  margin: 0 0 6px;
  font-size: 19px;
  text-align: center;
}
.auth-sub {
  margin: 0 0 24px;
  font-size: 13.5px;
  color: var(--text-muted);
  text-align: center;
}
#auth-form label {
  font-size: 12.5px;
  color: var(--text-muted);
  display: block;
  margin-bottom: 6px;
}
#auth-form input {
  width: 100%;
  background: var(--surface-raised);
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--text);
  padding: 11px 12px;
  font-family: var(--font-ui);
  font-size: 14px;
  outline: none;
  margin-bottom: 16px;
}
#auth-form input:focus { border-color: var(--signal); background: var(--surface); }
.auth-submit { width: 100%; padding: 12px; }
.auth-error {
  color: var(--danger);
  font-size: 13px;
  text-align: center;
  margin: 14px 0 0;
}