:root {
  --black: #000000;
  --white: #ffffff;
  --gray-50: #fafafa;
  --gray-100: #f4f4f5;
  --gray-200: #e4e4e7;
  --gray-300: #d4d4d8;
  --gray-400: #a1a1aa;
  --gray-500: #71717a;
  --gray-600: #52525b;
  --gray-700: #3f3f46;
  --gray-800: #27272a;
  --gray-900: #18181b;
  --green: #0a7d3c;
  --red: #d4183d;
  --radius: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.08);
  --font: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  /* Semantic tokens — light mode (default) */
  --bg: var(--white);
  --fg: var(--black);
  --surface: var(--white);
  --surface-muted: var(--gray-50);
  --border: var(--gray-200);
  --border-strong: var(--gray-400);
  --text-primary: var(--black);
  --text-secondary: var(--gray-500);
  --text-tertiary: var(--gray-400);
  --dot-grid: var(--gray-200);
  --overlay: rgba(0,0,0,0.4);
  --chart-line: #000000;
  --chart-grid: #f0f0f0;
  --skeleton-a: var(--gray-100);
  --skeleton-b: var(--gray-200);
  --invert-fg: var(--white);
}

[data-theme="dark"] {
  --bg: #000000;
  --fg: #ffffff;
  --surface: #111113;
  --surface-muted: #18181b;
  --border: #2a2a2e;
  --border-strong: #4a4a50;
  --text-primary: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-tertiary: #71717a;
  --dot-grid: #232326;
  --overlay: rgba(0,0,0,0.6);
  --chart-line: #ffffff;
  --chart-grid: #232326;
  --skeleton-a: #1c1c1f;
  --skeleton-b: #26262a;
  --invert-fg: #000000;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
}

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

html { background: var(--bg); }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* ── Animations ────────────────────────────────────────────── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}
.fade-in-up { animation: fadeInUp 0.5s cubic-bezier(0.16, 1, 0.3, 1); }
.fade-in { animation: fadeIn 0.4s ease; }
.scale-in { animation: scaleIn 0.25s cubic-bezier(0.16, 1, 0.3, 1); }

/* ── Auth pages (login / setup) ───────────────────────────── */
.auth-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  background-image: radial-gradient(circle at 1px 1px, var(--dot-grid) 1px, transparent 0);
  background-size: 24px 24px;
  padding: 24px;
}
.auth-card {
  width: 100%;
  max-width: 380px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  box-shadow: var(--shadow-lg);
  color: var(--text-primary);
}
.auth-logo {
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 20px;
  overflow: hidden;
}
.brand-icon-lg { width: 100%; height: 100%; object-fit: cover; }
.auth-title { font-size: 22px; font-weight: 600; letter-spacing: -0.02em; margin-bottom: 4px; }
.auth-subtitle { font-size: 14px; color: var(--text-secondary); margin-bottom: 24px; }
.auth-form { display: flex; flex-direction: column; gap: 10px; }
.auth-form input {
  font-family: var(--font);
  font-size: 14px;
  padding: 11px 14px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  background: var(--surface);
  color: var(--text-primary);
}
[data-theme="dark"] .auth-form input { border-color: var(--border-strong); }
.auth-form input:focus {
  border-color: var(--fg);
  box-shadow: 0 0 0 3px rgba(127,127,127,0.15);
}
.auth-form button {
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  padding: 11px 14px;
  background: var(--fg);
  color: var(--invert-fg);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: opacity 0.15s ease, transform 0.1s ease;
  margin-top: 6px;
}
.auth-form button:hover { opacity: 0.85; }
.auth-form button:active { transform: scale(0.98); }
.auth-error {
  font-size: 13px;
  color: var(--red);
  background: #fef2f2;
  border: 1px solid #fecaca;
  padding: 10px 12px;
  border-radius: var(--radius);
  margin-bottom: 16px;
}
[data-theme="dark"] .auth-error { background: #2a1215; border-color: #4a1d22; }
.auth-error.locked { color: var(--text-secondary); background: var(--surface-muted); border-color: var(--border); }
.attempts-left { color: var(--text-secondary); font-size: 12px; }

/* ── App shell ─────────────────────────────────────────────── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 32px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  z-index: 50;
}
.topbar-brand { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 18px; letter-spacing: -0.01em; color: var(--text-primary); }
.topbar-brand svg { display: block; }
.brand-icon { width: 32px; height: 32px; border-radius: 6px; object-fit: cover; display: block; }
.topbar-user { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--text-secondary); }
.theme-toggle-btn {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
}
.theme-toggle-btn:hover { border-color: var(--border-strong); color: var(--text-primary); }
.theme-toggle-btn .icon-sun { display: none; }
.theme-toggle-btn .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle-btn .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle-btn .icon-moon { display: none; }
.logout-link {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.15s ease;
}
.logout-link:hover { color: var(--white); border-color: var(--red); background: var(--red); }

.container { max-width: 920px; margin: 0 auto; padding: 48px 24px 100px; }

.section { margin-bottom: 64px; }
.section-header { margin-bottom: 24px; }
.section-title { font-size: 20px; font-weight: 600; letter-spacing: -0.02em; margin-bottom: 4px; color: var(--text-primary); }
.section-subtitle { font-size: 14px; color: var(--text-secondary); }

/* ── Shorten form ──────────────────────────────────────────── */
.shorten-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  background: var(--surface);
}
.name-row {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  margin-bottom: 12px;
}
.name-row label {
  font-size: 13px;
  color: var(--text-secondary);
}
.name-row input[type="text"] {
  font-family: var(--font);
  font-size: 14px;
  padding: 10px 14px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  outline: none;
  width: 240px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  background: var(--surface);
  color: var(--text-primary);
}
[data-theme="dark"] .name-row input[type="text"] { border-color: var(--border-strong); }
.name-row input[type="text"]:focus {
  border-color: var(--fg);
  box-shadow: 0 0 0 3px rgba(127,127,127,0.15);
}
.shorten-row { display: flex; gap: 10px; margin-bottom: 12px; }
.shorten-row input[type="url"] {
  flex: 1;
  font-family: var(--font);
  font-size: 14px;
  padding: 13px 16px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  background: var(--surface);
  color: var(--text-primary);
}
[data-theme="dark"] .shorten-row input[type="url"] { border-color: var(--border-strong); }
.shorten-row input[type="url"]:focus {
  border-color: var(--fg);
  box-shadow: 0 0 0 3px rgba(127,127,127,0.15);
}
.shorten-row button {
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  padding: 13px 22px;
  background: var(--fg);
  color: var(--invert-fg);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  white-space: nowrap;
  transition: opacity 0.15s ease, transform 0.1s ease;
}
.shorten-row button:hover { opacity: 0.85; }
.shorten-row button:active { transform: scale(0.98); }
.shorten-row button:disabled { opacity: 0.5; cursor: not-allowed; }
.alias-row { display: flex; align-items: center; gap: 8px; }
.alias-row label { font-size: 13px; color: var(--text-secondary); white-space: nowrap; }
.alias-row .alias-prefix { font-size: 13px; color: var(--text-tertiary); }
.alias-row input[type="text"] {
  font-family: var(--font);
  font-size: 13px;
  padding: 8px 10px;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  outline: none;
  width: 160px;
  background: var(--surface);
  color: var(--text-primary);
}
[data-theme="dark"] .alias-row input[type="text"] { border-color: var(--border-strong); }
.alias-row input[type="text"]:focus { border-color: var(--fg); }

.result-toast {
  display: none;
  margin-top: 16px;
  padding: 14px 16px;
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  opacity: 1;
  transition: opacity 0.4s ease;
}
.result-toast.show { display: flex; }
.result-toast.fade-out { opacity: 0; }
.result-toast .short-link {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.copy-badge {
  font-size: 12px;
  color: var(--text-secondary);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 5px 10px;
  border-radius: 6px;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
}
.copy-badge:hover { border-color: var(--border-strong); color: var(--text-primary); }
.copy-badge.copied { color: var(--green); border-color: var(--green); }

/* ── Links list ────────────────────────────────────────────── */
.links-list { display: flex; flex-direction: column; gap: 10px; }
.link-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.15s ease;
  background: var(--surface);
}
.link-row:hover { border-color: var(--border-strong); }
.link-row.disabled { opacity: 0.5; }
.link-main { flex: 1; min-width: 0; }
.link-short {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  display: inline-block;
  color: var(--text-primary);
}
.link-original {
  font-size: 13px;
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-top: 2px;
}
.link-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--surface-muted);
  border: 1px solid var(--border);
  padding: 2px 8px;
  border-radius: 20px;
  margin-right: 8px;
  cursor: pointer;
  transition: all 0.15s ease;
  vertical-align: middle;
}
.link-tag:hover { border-color: var(--border-strong); }
.link-tag.no-tag {
  color: var(--text-tertiary);
  background: transparent;
  border-style: dashed;
}
.tag-edit-input {
  font-family: var(--font);
  font-size: 11px;
  padding: 2px 8px;
  border: 1px solid var(--fg);
  border-radius: 20px;
  outline: none;
  margin-right: 8px;
  width: 90px;
  vertical-align: middle;
  background: var(--surface);
  color: var(--text-primary);
}
.link-clicks {
  font-size: 13px;
  color: var(--text-secondary);
  white-space: nowrap;
  min-width: 70px;
  text-align: right;
}
.link-actions { display: flex; align-items: center; gap: 6px; }
.icon-btn {
  width: 30px; height: 30px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  cursor: pointer;
  transition: all 0.15s ease;
  color: var(--text-secondary);
}
.icon-btn:hover { border-color: var(--border-strong); color: var(--text-primary); }
.icon-btn.danger:hover { border-color: var(--red); background: var(--red); color: var(--white); }
.toggle-switch {
  width: 34px; height: 20px;
  border-radius: 20px;
  background: var(--border-strong);
  position: relative;
  cursor: pointer;
  transition: background 0.2s ease;
  border: none;
  flex-shrink: 0;
}
.toggle-switch.active { background: var(--fg); }
.toggle-switch::after {
  content: '';
  position: absolute;
  top: 2px; left: 2px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--surface);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
.toggle-switch.active::after { transform: translateX(14px); }

.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-tertiary);
  font-size: 14px;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}

/* ── Analytics ─────────────────────────────────────────────── */
.analytics-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.analytics-controls input[type="date"] {
  font-family: var(--font);
  font-size: 13px;
  padding: 8px 12px;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text-primary);
  outline: none;
  color-scheme: light;
}
[data-theme="dark"] .analytics-controls input[type="date"] { border-color: var(--border-strong); color-scheme: dark; }
.analytics-controls input[type="date"]:focus { border-color: var(--fg); }
.date-sep { color: var(--text-tertiary); font-size: 13px; }

/* ── Custom dropdown ───────────────────────────────────────── */
.custom-select {
  position: relative;
  display: inline-block;
  min-width: 180px;
}
.custom-select-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-family: var(--font);
  font-size: 13px;
  padding: 8px 12px;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text-primary);
  cursor: pointer;
  transition: border-color 0.15s ease;
}
[data-theme="dark"] .custom-select-trigger { border-color: var(--border-strong); }
.custom-select-trigger:hover { border-color: var(--border-strong); }
.custom-select.open .custom-select-trigger { border-color: var(--fg); }
.custom-select-trigger svg {
  color: var(--text-tertiary);
  flex-shrink: 0;
  transition: transform 0.15s ease;
}
.custom-select.open .custom-select-trigger svg { transform: rotate(180deg); }
.custom-select-label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.custom-select-menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 100%;
  max-height: 260px;
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 6px;
  z-index: 100;
}
.custom-select.open .custom-select-menu {
  display: block;
  animation: scaleIn 0.15s cubic-bezier(0.16, 1, 0.3, 1);
  transform-origin: top left;
}
.custom-select-option {
  font-size: 13px;
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background 0.1s ease;
  color: var(--text-primary);
}
.custom-select-option:hover { background: var(--surface-muted); }
.custom-select-option.selected { background: var(--fg); color: var(--invert-fg); }

/* ── Confirm modal ─────────────────────────────────────────── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--overlay);
  backdrop-filter: blur(2px);
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.modal-overlay.show {
  display: flex;
  animation: fadeIn 0.15s ease;
}
.modal-box {
  width: 100%;
  max-width: 340px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-lg);
  margin: 16px;
  animation: scaleIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}
.modal-title { font-size: 17px; font-weight: 600; letter-spacing: -0.01em; margin-bottom: 6px; color: var(--text-primary); }
.modal-subtext { font-size: 13px; color: var(--text-secondary); margin-bottom: 20px; line-height: 1.5; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; }
.modal-btn {
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  padding: 9px 16px;
  border-radius: 8px;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-primary);
  transition: all 0.15s ease;
}
.modal-btn:hover { border-color: var(--border-strong); }
.modal-btn.primary {
  background: var(--fg);
  color: var(--invert-fg);
  border-color: var(--fg);
}
.modal-btn.primary:hover { background: var(--red); border-color: var(--red); color: #fff; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}
.stat-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  background: var(--surface);
}
.stat-label { font-size: 12px; color: var(--text-secondary); margin-bottom: 6px; }
.stat-value { font-size: 26px; font-weight: 600; letter-spacing: -0.02em; color: var(--text-primary); }

.chart-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
  background: var(--surface);
}
.chart-card-title { font-size: 13px; font-weight: 500; color: var(--text-secondary); margin-bottom: 16px; }
.chart-wrap { width: 100%; height: 220px; }

.breakdown-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 640px) {
  .breakdown-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
}

.device-row, .referrer-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  padding: 8px 0;
}
.device-row .label, .referrer-row .label {
  width: 90px;
  color: var(--text-secondary);
  flex-shrink: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.bar-track {
  flex: 1;
  height: 6px;
  background: var(--surface-muted);
  border-radius: 4px;
  overflow: hidden;
}
[data-theme="dark"] .bar-track { background: var(--border); }
.bar-fill {
  height: 100%;
  background: var(--fg);
  border-radius: 4px;
  transition: width 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}
.bar-count { width: 34px; text-align: right; color: var(--text-secondary); flex-shrink: 0; }

.skeleton {
  background: linear-gradient(90deg, var(--skeleton-a) 25%, var(--skeleton-b) 50%, var(--skeleton-a) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.4s ease infinite;
  border-radius: 6px;
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

::selection { background: var(--black); color: var(--white); }