* { 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: flex; align-items: center; gap: .4rem; }

/* 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:nth-child(2), td:nth-child(3), th:nth-child(2), th:nth-child(3) { 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; }

/* Responsive */
@media (max-width: 900px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  header { padding: 1rem; }
  .cards { padding: 1rem; }
  .chart-container, .panel.full-width { margin: 0 1rem 1rem; }
  .grid-2, .grid-3 { padding: 0 1rem 1rem; }
}