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

:root {
  --bg: #f5f7fa;
  --bg-card: #fff;
  --text: #1a1a2e;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --border-light: #f3f4f6;
  --shadow: rgba(0,0,0,.05);
  --input-bg: #fff;
  --input-border: #d1d5db;
  --hover-bg: #f9fafb;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --chart-grid: #f3f4f6;
}

[data-theme="dark"] {
  --bg: #0f1117;
  --bg-card: #1a1d2e;
  --text: #e5e7eb;
  --text-muted: #9ca3af;
  --border: #2d3348;
  --border-light: #232740;
  --shadow: rgba(0,0,0,.3);
  --input-bg: #232740;
  --input-border: #3b4160;
  --hover-bg: #232740;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --chart-grid: #2d3348;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  transition: background .2s, color .2s;
}

/* Login */
#login-overlay {
  position: fixed; inset: 0;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000;
}
.login-box {
  background: var(--bg-card); padding: 2.5rem; border-radius: 12px;
  box-shadow: 0 4px 24px var(--shadow);
  text-align: center; width: 340px;
}
.login-box h2 { margin-bottom: 1.5rem; font-size: 1.4rem; }
.login-box input {
  width: 100%; padding: .7rem 1rem; border: 1px solid var(--input-border);
  border-radius: 8px; font-size: .95rem; margin-bottom: 1rem;
  background: var(--input-bg); color: var(--text);
}
.login-box button, .btn {
  padding: .7rem 1.2rem; background: var(--accent); color: #fff;
  border: none; border-radius: 8px; font-size: .9rem; cursor: pointer;
}
.login-box button { width: 100%; font-size: 1rem; }
.login-box button:hover, .btn:hover { background: var(--accent-hover); }
.login-error { color: #ef4444; font-size: .85rem; margin-bottom: .75rem; display: none; }

/* Header */
header {
  background: var(--bg-card); padding: 1rem 2rem;
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--border); flex-wrap: wrap; gap: .75rem;
}
.header-left { display: flex; align-items: center; gap: 1rem; }
.header-left h1 { font-size: 1.3rem; }
.header-right { display: flex; align-items: center; gap: .75rem; flex-wrap: wrap; }
.header-actions { display: flex; align-items: center; gap: .5rem; }

select, input[type="date"], input[type="text"], input[type="email"], input[type="password"] {
  padding: .4rem .6rem; border: 1px solid var(--input-border);
  border-radius: 6px; font-size: .85rem;
  background: var(--input-bg); color: var(--text);
}

.date-buttons { display: flex; gap: .25rem; }
.range-btn {
  padding: .4rem .75rem; border: 1px solid var(--input-border); background: var(--bg-card);
  border-radius: 6px; cursor: pointer; font-size: .82rem; color: var(--text);
}
.range-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.date-custom {
  display: none; align-items: center; gap: .4rem;
  background: var(--bg-card); border: 1px solid var(--accent);
  border-radius: 8px; padding: .3rem .6rem;
}
.date-custom.visible { display: flex; }

/* Theme toggle */
.theme-toggle {
  background: none; border: 1px solid var(--input-border); border-radius: 6px;
  padding: .35rem .5rem; cursor: pointer; font-size: 1rem; line-height: 1;
  color: var(--text);
}
.theme-toggle:hover { background: var(--hover-bg); }

/* Icon buttons */
.icon-btn {
  background: none; border: 1px solid var(--input-border); border-radius: 6px;
  padding: .35rem .6rem; cursor: pointer; font-size: .82rem;
  color: var(--text); display: flex; align-items: center; gap: .3rem;
}
.icon-btn:hover { background: var(--hover-bg); }

/* Cards */
.cards {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem; padding: 1.5rem 2rem;
}
.card {
  background: var(--bg-card); padding: 1.25rem 1.5rem; border-radius: 10px;
  box-shadow: 0 1px 4px var(--shadow);
}
.card-label { font-size: .78rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: .04em; }
.card-value { font-size: 1.8rem; font-weight: 700; margin-top: .25rem; }

/* Chart */
.chart-container {
  background: var(--bg-card); margin: 0 2rem 1.5rem; padding: 1.5rem;
  border-radius: 10px; box-shadow: 0 1px 4px var(--shadow);
}

/* Grids */
.grid-2 {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 1rem; padding: 0 2rem 1.5rem;
}
.grid-3 {
  display: grid; grid-template-columns: 1fr 1fr 1fr;
  gap: 1rem; padding: 0 2rem 1.5rem;
}
.panel {
  background: var(--bg-card); padding: 1.25rem 1.5rem; border-radius: 10px;
  box-shadow: 0 1px 4px var(--shadow);
}
.panel.full-width { margin: 0 2rem 1.5rem; }
.panel h3 { font-size: .95rem; margin-bottom: .75rem; color: var(--text); }

/* Tables */
table { width: 100%; border-collapse: collapse; font-size: .85rem; }
th { text-align: left; padding: .5rem .4rem; color: var(--text-muted); font-weight: 600; border-bottom: 1px solid var(--border); }
td { padding: .5rem .4rem; border-bottom: 1px solid var(--border-light); }
td:last-child, td:nth-last-child(2), th:last-child, th:nth-last-child(2) { text-align: right; }
tbody tr:hover { background: var(--hover-bg); }

/* Modal / Settings overlay */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.5);
  display: flex; align-items: center; justify-content: center;
  z-index: 2000;
}
.modal {
  background: var(--bg-card); border-radius: 12px;
  padding: 2rem; width: 600px; max-width: 95vw; max-height: 85vh;
  overflow-y: auto; box-shadow: 0 8px 40px rgba(0,0,0,.2);
}
.modal h2 { margin-bottom: 1.5rem; font-size: 1.2rem; }
.modal-tabs { display: flex; gap: .5rem; margin-bottom: 1.5rem; border-bottom: 1px solid var(--border); padding-bottom: .5rem; }
.modal-tab {
  padding: .4rem .8rem; border: none; background: none; cursor: pointer;
  font-size: .85rem; color: var(--text-muted); border-radius: 6px;
}
.modal-tab.active { background: var(--accent); color: #fff; }
.modal-section { display: none; }
.modal-section.active { display: block; }

.form-row { margin-bottom: 1rem; }
.form-row label { display: block; font-size: .82rem; color: var(--text-muted); margin-bottom: .3rem; }
.form-row input, .form-row select {
  width: 100%; padding: .5rem .7rem; border: 1px solid var(--input-border);
  border-radius: 6px; font-size: .85rem; background: var(--input-bg); color: var(--text);
}
.form-actions { display: flex; gap: .5rem; margin-top: 1rem; }

.btn-sm {
  padding: .3rem .7rem; font-size: .78rem; border: none; border-radius: 5px;
  cursor: pointer; background: var(--accent); color: #fff;
}
.btn-sm:hover { background: var(--accent-hover); }
.btn-danger { background: #ef4444; }
.btn-danger:hover { background: #dc2626; }
.btn-outline {
  background: none; border: 1px solid var(--input-border); color: var(--text);
}
.btn-outline:hover { background: var(--hover-bg); }

.settings-list { list-style: none; }
.settings-list li {
  display: flex; align-items: center; justify-content: space-between;
  padding: .6rem 0; border-bottom: 1px solid var(--border-light);
}
.settings-list li:last-child { border-bottom: none; }
.settings-list .item-info { display: flex; flex-direction: column; }
.settings-list .item-label { font-size: .9rem; }
.settings-list .item-sub { font-size: .78rem; color: var(--text-muted); }

.user-badge {
  display: inline-block; padding: .1rem .5rem; border-radius: 4px;
  font-size: .72rem; font-weight: 600; text-transform: uppercase;
}
.user-badge.admin { background: #fef3c7; color: #92400e; }
.user-badge.viewer { background: #dbeafe; color: #1e40af; }
[data-theme="dark"] .user-badge.admin { background: #78350f; color: #fde68a; }
[data-theme="dark"] .user-badge.viewer { background: #1e3a5f; color: #93c5fd; }

/* Site picker dropdown */
.site-picker { position: relative; }
.site-picker-btn {
  display: flex; align-items: center; gap: 6px;
  padding: .4rem .8rem; border: 1px solid var(--input-border); border-radius: 6px;
  background: var(--input-bg); color: var(--text); font-size: .85rem; cursor: pointer;
  min-width: 160px;
}
.site-picker-btn::after { content: '\25BE'; margin-left: auto; font-size: .7rem; opacity: .6; }
.site-picker-btn img { width: 16px; height: 16px; flex-shrink: 0; }
.site-picker-dropdown {
  display: none; position: absolute; top: 100%; left: 0; margin-top: 4px;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px;
  box-shadow: 0 8px 24px var(--shadow); z-index: 100; min-width: 220px; max-height: 360px;
  overflow-y: auto;
}
.site-picker-dropdown.open { display: block; }
.site-picker-item {
  display: flex; align-items: center; gap: 8px;
  padding: .5rem .8rem; cursor: pointer; font-size: .85rem; color: var(--text);
  border: none; background: none; width: 100%; text-align: left;
}
.site-picker-item:hover { background: var(--hover-bg); }
.site-picker-item.active { background: var(--accent); color: #fff; }
.site-picker-item img { width: 16px; height: 16px; flex-shrink: 0; }

/* Mini bar for referrers */
.mini-bar {
  display: inline-block;
  height: 4px;
  background: var(--accent);
  border-radius: 2px;
  opacity: 0.4;
  vertical-align: middle;
  margin-left: 6px;
  min-width: 2px;
}

/* Skeleton loader */
@keyframes skeleton-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.skeleton {
  display: inline-block;
  background: var(--border);
  border-radius: 4px;
  animation: skeleton-pulse 1.4s ease-in-out infinite;
  min-width: 3rem;
  height: 1em;
  vertical-align: middle;
}
.card-value .skeleton { height: 1.8rem; width: 4rem; }
td .skeleton { display: block; height: 0.75rem; border-radius: 3px; }

/* Table horizontal scroll wrapper */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }

/* Responsive */
@media (max-width: 900px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  header { padding: .75rem 1rem; flex-direction: column; align-items: flex-start; gap: .5rem; }
  .header-left { width: 100%; }
  .header-right { width: 100%; flex-direction: column; align-items: flex-start; gap: .5rem; }
  .date-buttons { flex-wrap: wrap; }
  .header-actions { flex-wrap: wrap; }
  .cards { padding: 1rem; grid-template-columns: repeat(2, 1fr); }
  .chart-container, .panel.full-width { margin: 0 1rem 1rem; }
  .grid-2, .grid-3 { padding: 0 1rem 1rem; }
  /* Touch targets */
  .range-btn, .icon-btn, .theme-toggle, select, input[type="date"] {
    min-height: 44px; padding-top: .5rem; padding-bottom: .5rem;
  }
  .site-picker-btn { min-height: 44px; }
  .site-picker-item { min-height: 44px; }
  /* Site picker: full-width and fixed max-height so it doesn't go off-screen */
  .site-picker { width: 100%; }
  .site-picker-btn { width: 100%; }
  .site-picker-dropdown { width: 100%; left: 0; right: 0; max-height: 260px; }
}

@media (max-width: 480px) {
  .cards { grid-template-columns: 1fr; padding: .75rem; }
  .header-left h1 { font-size: 1.1rem; }
  .date-custom.visible { flex-wrap: wrap; gap: .3rem; }
  .date-custom input[type="date"] { flex: 1 1 120px; }
  .date-buttons { gap: .2rem; }
  .range-btn { padding: .5rem .5rem; font-size: .78rem; }
  .chart-container { padding: 1rem .75rem; }
  .panel { padding: 1rem .75rem; }
}

/* Period-over-period comparison */
.card-compare {
  font-size: .78rem;
  color: var(--text-muted);
  margin-top: .25rem;
  min-height: 1em;
}
.card-compare .trend-up   { color: #10b981; font-weight: 600; }
.card-compare .trend-down { color: #ef4444; font-weight: 600; }
.card-compare .trend-neutral { color: var(--text-muted); font-weight: 600; }
#compare-toggle-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}


/* Heartbeat badge */
#heartbeat-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: .78rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 99px;
  border: 1px solid;
  white-space: nowrap;
  transition: opacity 0.2s;
}
#heartbeat-badge.live {
  color: #059669;
  background: #d1fae5;
  border-color: #6ee7b7;
}
#heartbeat-badge.offline {
  color: #dc2626;
  background: #fee2e2;
  border-color: #fca5a5;
}
#heartbeat-badge.checking {
  color: var(--text-muted);
  background: var(--panel-bg, #fff);
  border-color: var(--border, #e5e7eb);
}
#heartbeat-badge .hb-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  flex-shrink: 0;
}
#heartbeat-badge.live .hb-dot {
  animation: hb-pulse 1.8s ease-in-out infinite;
}
@keyframes hb-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: .4; transform: scale(0.8); }
}