:root {
  /* Color Palette */
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: #eef2ff;

  --bg-body: #f8fafc;
  --bg-card: #ffffff;

  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-on-primary: #ffffff;

  --border: #e2e8f0;
  --border-focus: #cbd5e1;

  --error: #ef4444;
  --error-bg: #fef2f2;
  --success: #10b981;

  /* Shadows & Radii */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius-sm: 0.375rem;
  --radius: 0.75rem;
  --radius-lg: 1rem;

  /* Transitions */
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.6;
  padding: 1.5rem 1rem;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

/* Header */
header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.app-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--primary);
  margin-bottom: 0.25rem;
}

.subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
}

/* Stats Bar */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-card);
  padding: 1.25rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.stat-icon {
  background: var(--primary-light);
  color: var(--primary);
  padding: 0.75rem;
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.stat-info {
  display: flex;
  flex-direction: column;
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.stat-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

/* Dashboard Grid */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: start;
}

@media (min-width: 850px) {
  .dashboard-grid {
    grid-template-columns: 350px 1fr;
  }
}

/* Cards */
.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

.card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.card-icon {
  color: var(--primary);
  width: 1.5rem;
  height: 1.5rem;
}

.card h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
}

/* Form Styles */
.form-group {
  margin-bottom: 1.25rem;
}

label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 0.75rem;
  color: var(--text-muted);
  width: 1.125rem;
  height: 1.125rem;
}

input[type="text"],
input[type="number"] {
  width: 100%;
  padding: 0.625rem 0.625rem 0.625rem 2.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  transition: var(--transition);
}

input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* Multiplier Grid */
.multiplier-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.875rem;
  transition: var(--transition);
}

.checkbox-label:hover {
  background: var(--bg-body);
  border-color: var(--border-focus);
}

.checkbox-label input {
  width: 1rem;
  height: 1rem;
  accent-color: var(--primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
}

.btn-block {
  width: 100%;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--text-on-primary);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 6px -1px rgb(99 102 241 / 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--border);
  color: var(--text-main);
}

.btn-outline:hover {
  background-color: var(--bg-body);
  border-color: var(--border-focus);
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.75rem;
}

/* Tables */
.table-container {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

th, td {
  text-align: left;
  padding: 0.75rem 0.5rem;
  border-bottom: 1px solid var(--border);
}

.text-right {
  text-align: right;
}

th {
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.modal-content {
  background: var(--bg-card);
  padding: 2rem;
  border-radius: var(--radius-lg);
  max-width: 400px;
  width: 100%;
  text-align: center;
  box-shadow: var(--shadow);
}

.modal-icon {
  font-size: 3rem;
  color: var(--primary);
  margin-bottom: 1.5rem;
}

.modal-title {
  margin-bottom: 0.5rem;
}

.modal-content p {
  margin-bottom: 1.5rem;
  color: var(--text-muted);
}

/* User Header */
.user-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding: 0.75rem 1rem;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.user-profile {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-main);
}

/* Error Message */
.error-msg {
  background: var(--error-bg);
  color: var(--error);
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  margin-top: 1rem;
  font-size: 0.875rem;
  border: 1px solid #fecaca;
}