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

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --success: #10b981;
  --success-hover: #059669;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --warning: #f59e0b;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  color: var(--gray-900);
  line-height: 1.6;
}

/* Auth Pages */
.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.auth-card {
  background: white;
  border-radius: 16px;
  padding: 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
}

.auth-card h1 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 10px;
  color: var(--primary);
}

.auth-card h2 {
  text-align: center;
  font-size: 1.5rem;
  margin-bottom: 30px;
  color: var(--gray-700);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--gray-700);
}

.form-group input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--gray-200);
  border-radius: 8px;
  font-size: 16px;
  transition: border-color 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary);
}

.alert {
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 20px;
  font-size: 14px;
}

.alert-error {
  background: #fee;
  color: var(--danger);
  border: 1px solid var(--danger);
}

.alert-success {
  background: #efe;
  color: var(--success);
  border: 1px solid var(--success);
}

.auth-link {
  text-align: center;
  margin-top: 20px;
  color: var(--gray-600);
}

.auth-link a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

.auth-link a:hover {
  text-decoration: underline;
}

/* Buttons */
.btn {
  width: 100%;
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  display: inline-block;
  text-align: center;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.btn-secondary {
  background: var(--gray-600);
  color: white;
}

.btn-secondary:hover {
  background: var(--gray-700);
}

.btn-small {
  padding: 8px 16px;
  font-size: 14px;
  width: auto;
}

.btn-start {
  background: var(--success);
  color: white;
  font-size: 18px;
}

.btn-start:hover:not(:disabled) {
  background: var(--success-hover);
  transform: scale(1.05);
}

.btn-stop {
  background: var(--danger);
  color: white;
  font-size: 18px;
}

.btn-stop:hover {
  background: var(--danger-hover);
  transform: scale(1.05);
}

/* Main Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.header {
  background: white;
  border-radius: 16px;
  padding: 24px 32px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.header h1 {
  font-size: 2rem;
  color: var(--primary);
}

.header-info {
  display: flex;
  align-items: center;
  gap: 16px;
}

.username {
  font-weight: 500;
  color: var(--gray-700);
}

.main-content {
  display: grid;
  gap: 24px;
}

/* Control Section */
.control-section {
  background: white;
  border-radius: 16px;
  padding: 32px;
  box-shadow: var(--shadow);
}

.time-display {
  text-align: center;
  margin-bottom: 32px;
}

.time-display h2 {
  font-size: 1.25rem;
  color: var(--gray-700);
  margin-bottom: 16px;
}

.remaining-time {
  font-size: 3rem;
  font-weight: bold;
  color: var(--primary);
  margin-bottom: 8px;
}

.remaining-time.warning {
  color: var(--warning);
}

.remaining-time.danger {
  color: var(--danger);
}

.current-break {
  font-size: 1rem;
  color: var(--gray-600);
  min-height: 24px;
}

.control-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 16px;
}

.control-buttons .btn {
  max-width: 300px;
}

.message {
  text-align: center;
  padding: 12px;
  border-radius: 8px;
  font-weight: 500;
  min-height: 44px;
}

.message.success {
  background: #efe;
  color: var(--success);
}

.message.error {
  background: #fee;
  color: var(--danger);
}

.message.warning {
  background: #fef3e7;
  color: var(--warning);
}

/* Overview Section */
.overview-section {
  background: white;
  border-radius: 16px;
  padding: 32px;
  box-shadow: var(--shadow);
}

.overview-section h2 {
  margin-bottom: 20px;
  color: var(--gray-800);
}

.table-container {
  overflow-x: auto;
}

.breaks-table {
  width: 100%;
  border-collapse: collapse;
}

.breaks-table thead {
  background: var(--gray-50);
}

.breaks-table th {
  padding: 12px;
  text-align: left;
  font-weight: 600;
  color: var(--gray-700);
  border-bottom: 2px solid var(--gray-200);
}

.breaks-table td {
  padding: 12px;
  border-bottom: 1px solid var(--gray-200);
}

.breaks-table tbody tr:hover {
  background: var(--gray-50);
}

.breaks-table .loading,
.breaks-table .empty {
  text-align: center;
  color: var(--gray-600);
  padding: 24px;
}

/* Week Overview */
.week-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
}

.week-day {
  background: var(--gray-50);
  padding: 20px;
  border-radius: 12px;
  text-align: center;
  border: 2px solid var(--gray-200);
  transition: transform 0.2s;
}

.week-day:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
}

.week-day.today {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border-color: var(--primary);
}

.week-day-name {
  font-weight: 600;
  margin-bottom: 8px;
  font-size: 0.9rem;
}

.week-day-date {
  font-size: 0.85rem;
  opacity: 0.8;
  margin-bottom: 12px;
}

.week-day-minutes {
  font-size: 1.75rem;
  font-weight: bold;
}

.week-day-label {
  font-size: 0.75rem;
  opacity: 0.9;
  margin-top: 4px;
}

.loading {
  text-align: center;
  color: var(--gray-600);
  padding: 24px;
}

/* Responsive */
@media (max-width: 768px) {
  .header {
    padding: 20px;
  }

  .header h1 {
    font-size: 1.5rem;
  }

  .control-section,
  .overview-section {
    padding: 20px;
  }

  .remaining-time {
    font-size: 2rem;
  }

  .control-buttons {
    flex-direction: column;
  }

  .control-buttons .btn {
    max-width: 100%;
  }

  .week-container {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  }
}