/**
 * Timesheet System - Main Stylesheet
 * Minimalist dark theme with modern design
 */

/* ===== CSS Variables ===== */
:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --bg-hover: #30363d;
  
  --text-primary: #c9d1d9;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  
  --border-color: #30363d;
  --border-radius: 8px;
  
  --accent-blue: #58a6ff;
  --accent-green: #3fb950;
  --accent-yellow: #d29922;
  --accent-red: #f85149;
  --accent-purple: #bc8cff;
  
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.6);
}

/* ===== Reset & Base ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 14px;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ===== Login Page ===== */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
  background: linear-gradient(135deg, #0d1117 0%, #161b22 100%);
}

.login-container {
  width: 100%;
  max-width: 420px;
}

.login-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.login-header {
  text-align: center;
  padding: 32px 24px 24px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
}

.login-header h1 {
  font-size: 28px;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.login-header p {
  color: var(--text-secondary);
  font-size: 14px;
}

.login-form {
  padding: 24px;
}

.login-footer {
  padding: 16px 24px;
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.login-footer details {
  margin-bottom: 12px;
}

.login-footer summary {
  cursor: pointer;
  color: var(--accent-blue);
  font-size: 13px;
  margin-bottom: 8px;
}

.login-footer .version {
  color: var(--text-muted);
  font-size: 12px;
}

.test-accounts {
  width: 100%;
  margin-top: 12px;
  font-size: 12px;
  text-align: left;
  border-collapse: collapse;
}

.test-accounts td {
  padding: 4px 8px;
  color: var(--text-secondary);
  font-family: 'Monaco', 'Courier New', monospace;
}

.test-accounts strong {
  color: var(--text-primary);
}

/* ===== App Layout ===== */
.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.app-header h1 {
  font-size: 20px;
  font-weight: 600;
}

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

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

.user-info {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
}

.user-name {
  font-weight: 600;
  font-size: 14px;
}

.user-role {
  font-size: 12px;
  color: var(--text-secondary);
}

/* ===== Navigation ===== */
.app-nav {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 0 24px;
  display: flex;
  gap: 4px;
  overflow-x: auto;
}

.nav-link {
  padding: 12px 16px;
  color: var(--text-secondary);
  font-weight: 500;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: all 0.2s;
}

.nav-link:hover {
  color: var(--text-primary);
  text-decoration: none;
  background: var(--bg-hover);
}

.nav-link.active {
  color: var(--accent-blue);
  border-bottom-color: var(--accent-blue);
}

/* ===== Main Content ===== */
.app-main {
  flex: 1;
  padding: 24px;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

.page-header {
  margin-bottom: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.page-header h2 {
  font-size: 24px;
  font-weight: 600;
}

.section {
  margin-bottom: 32px;
}

.section h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
}

/* ===== Forms ===== */
.form-group {
  margin-bottom: 20px;
}

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

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="number"],
.form-group input[type="date"],
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  transition: all 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.1);
}

.form-group input[type="checkbox"] {
  margin-right: 8px;
}

.form-group small {
  display: block;
  margin-top: 4px;
  color: var(--text-muted);
  font-size: 12px;
}

/* ===== Buttons ===== */
.btn {
  padding: 10px 20px;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

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

.btn-primary {
  background: var(--accent-blue);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: #4a95e8;
  box-shadow: 0 4px 12px rgba(88, 166, 255, 0.3);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-hover);
}

.btn-danger {
  background: var(--accent-red);
  color: #fff;
}

.btn-danger:hover:not(:disabled) {
  background: #e03e36;
}

.btn-block {
  width: 100%;
  justify-content: center;
}

.btn-small {
  padding: 6px 12px;
  font-size: 13px;
}

.btn-xs {
  padding: 4px 8px;
  font-size: 12px;
}

.action-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ===== Stats Grid ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 20px;
  display: flex;
  gap: 16px;
  align-items: center;
  transition: all 0.2s;
}

.stat-card:hover {
  border-color: var(--accent-blue);
  transform: translateY(-2px);
}

.stat-card.stat-highlight {
  border-color: var(--accent-blue);
  background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(88, 166, 255, 0.1) 100%);
}

.stat-card.stat-warning {
  border-color: var(--accent-red);
}

.stat-icon {
  font-size: 32px;
  opacity: 0.8;
}

.stat-content {
  flex: 1;
}

.stat-label {
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.stat-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
}

/* ===== Activity List ===== */
.activity-list {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.activity-item {
  display: grid;
  grid-template-columns: 100px 1fr 60px 100px;
  gap: 16px;
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
  align-items: center;
  transition: background 0.2s;
}

.activity-item:last-child {
  border-bottom: none;
}

.activity-item:hover {
  background: var(--bg-tertiary);
}

.activity-date {
  font-size: 13px;
  color: var(--text-secondary);
}

.activity-details {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.activity-project {
  font-weight: 500;
  color: var(--text-primary);
}

.activity-client {
  font-size: 12px;
}

.activity-hours {
  font-weight: 600;
  color: var(--accent-blue);
  text-align: right;
}

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

/* ===== Table ===== */
.table-responsive {
  overflow-x: auto;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
}

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

.table thead {
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
}

.table th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 13px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

.table tbody tr:hover {
  background: var(--bg-tertiary);
}

/* ===== Badges ===== */
.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-gray {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.badge-blue {
  background: rgba(88, 166, 255, 0.2);
  color: var(--accent-blue);
}

.badge-green {
  background: rgba(63, 185, 80, 0.2);
  color: var(--accent-green);
}

.badge-red {
  background: rgba(248, 81, 73, 0.2);
  color: var(--accent-red);
}

.badge-yellow {
  background: rgba(210, 153, 34, 0.2);
  color: var(--accent-yellow);
}

/* ===== Modal ===== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
  overflow-y: auto;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  max-width: 600px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  font-size: 20px;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 24px;
  cursor: pointer;
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: all 0.2s;
}

.modal-close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.modal-body {
  padding: 24px;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

/* ===== Filters ===== */
.filters {
  margin-bottom: 24px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.filters select {
  padding: 8px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 14px;
  cursor: pointer;
}

/* ===== Messages ===== */
.error-message,
.warning-message,
.success-message {
  padding: 12px 16px;
  border-radius: 6px;
  margin-bottom: 16px;
  font-size: 14px;
}

.error-message {
  background: rgba(248, 81, 73, 0.2);
  border: 1px solid var(--accent-red);
  color: var(--accent-red);
}

.warning-message {
  background: rgba(210, 153, 34, 0.2);
  border: 1px solid var(--accent-yellow);
  color: var(--accent-yellow);
}

.success-message {
  background: rgba(63, 185, 80, 0.2);
  border: 1px solid var(--accent-green);
  color: var(--accent-green);
}

/* ===== States ===== */
.loading {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-secondary);
  font-size: 16px;
}

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
  font-size: 16px;
}

/* ===== Utilities ===== */
.text-muted {
  color: var(--text-muted);
}

.text-sm {
  font-size: 12px;
}

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

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .app-header {
    flex-direction: column;
    gap: 12px;
  }

  .app-main {
    padding: 16px;
  }

  .page-header {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .activity-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .activity-status,
  .activity-hours {
    text-align: left;
  }

  .table th,
  .table td {
    padding: 8px 12px;
    font-size: 13px;
  }
}

/* ===== Animations ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-content {
  animation: fadeIn 0.2s ease-out;
}