:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text-main: #1e293b;
  --text-sub: #64748b;
  --border: #e2e8f0;
  --danger: #ef4444;
  --success: #10b981;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Inter', system-ui, sans-serif;
}

body {
  background-color: var(--bg);
  color: var(--text-main);
  line-height: 1.5;
}

.app-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  padding: 0 10px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.user-info {
  color: var(--text-sub);
  font-weight: 500;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
}

.tab-btn {
  background: transparent;
  border: none;
  padding: 8px 16px;
  font-size: 1rem;
  color: var(--text-sub);
  cursor: pointer;
  border-radius: 6px;
  font-weight: 500;
}

.tab-btn:hover {
  background: #e2e8f0;
  color: var(--text-main);
}

.tab-btn.active {
  background: #dbeafe;
  color: var(--primary);
}

main {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

/* Grid Layout */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 20px;
}

/* Cards */
.card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: transform 0.2s;
}

.card:hover {
  transform: translateY(-2px);
}

h2,
h3 {
  margin-bottom: 20px;
  font-weight: 600;
}

/* Forms */
.form-group {
  margin-bottom: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-sub);
  margin-bottom: 6px;
}

input[type="text"],
input[type="date"],
input[type="number"],
input[type="password"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  outline: none;
  font-size: 0.95rem;
  transition: border-color 0.2s;
  background: white;
}

select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  outline: none;
  font-size: 0.95rem;
  transition: border-color 0.2s;
  background: white;
}

input:focus,
select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

select {
  appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1em;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

/* Buttons */
.btn {
  padding: 10px 18px;
  border-radius: 8px;
  border: none;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.95rem;
}

.full-width {
  width: 100%;
}

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

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-secondary {
  background: #334155;
  color: white;
}

.btn-secondary:hover {
  background: #1e293b;
}

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

.btn-outline:hover {
  background: #f1f5f9;
  color: var(--text-main);
}

.btn-danger {
  background: #fee2e2;
  color: var(--danger);
  font-size: 0.85rem;
  padding: 6px 12px;
}

.btn-danger:hover {
  background: #fecaca;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Contract List Grid */
.grid-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.contract-card {
  border-left: 4px solid var(--success);
}

.contract-card.expiring {
  border-left-color: var(--danger);
  background: #fef2f2;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.card-body p {
  margin-bottom: 8px;
  color: var(--text-sub);
  font-size: 0.9rem;
}

.card-body strong {
  color: var(--text-main);
}

.card-actions {
  margin-top: 15px;
  padding-top: 15px;
  border-top: 1px solid var(--border);
  text-align: right;
}

.status-badge {
  font-size: 0.75rem;
  padding: 4px 8px;
  border-radius: 20px;
  background: #dcfce7;
  color: #166534;
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal {
  background: white;
  padding: 30px;
  border-radius: 16px;
  width: 90%;
  max-width: 400px;
  text-align: center;
}

.modal h2 {
  margin-bottom: 10px;
}

.modal p {
  color: var(--text-sub);
  margin-bottom: 20px;
}

.error-msg {
  color: var(--danger) !important;
  font-size: 0.875rem;
  margin-top: 10px;
}

/* Utilities */
.btn-group {
  display: flex;
  gap: 10px;
  margin-top: 10px;
}

@media (max-width: 600px) {
  .form-row {
    grid-template-columns: 1fr;
  }

  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}