:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-border: #e2e8f0;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-danger: #dc2626;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.06);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.app-shell { display: flex; flex-direction: column; min-height: 100vh; }
.app-main { flex: 1; max-width: 1100px; width: 100%; margin: 0 auto; padding: 24px 20px 64px; }
.app-footer { text-align: center; padding: 24px; color: var(--color-text-muted); font-size: 14px; }

/* Navbar */
.navbar { background: var(--color-surface); border-bottom: 1px solid var(--color-border); }
.navbar-inner { max-width: 1100px; margin: 0 auto; padding: 14px 20px; display: flex; align-items: center; gap: 24px; }
.navbar-brand { font-weight: 700; font-size: 18px; color: var(--color-text); display: flex; align-items: center; gap: 8px; }
.navbar-brand:hover { text-decoration: none; }
.brand-mark { background: var(--color-primary); color: white; padding: 4px 8px; border-radius: 6px; font-size: 13px; }
.navbar-links { display: flex; gap: 18px; flex: 1; }
.navbar-links a { color: var(--color-text); font-weight: 500; }
.navbar-actions { display: flex; align-items: center; gap: 12px; }
.navbar-user { color: var(--color-text-muted); font-size: 14px; }

/* Buttons */
.btn { border: none; border-radius: 8px; padding: 9px 16px; font-size: 14px; font-weight: 600; cursor: pointer; display: inline-block; text-align: center; }
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--color-primary); color: white; }
.btn-primary:hover { background: var(--color-primary-dark); }
.btn-ghost { background: transparent; color: var(--color-text); border: 1px solid var(--color-border); }
.btn-danger { background: transparent; color: var(--color-danger); border: 1px solid var(--color-danger); }
.btn-block { width: 100%; }
.btn-lg { padding: 12px 24px; font-size: 16px; }
.btn-sm { padding: 6px 10px; font-size: 13px; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

/* Hero */
.hero { background: linear-gradient(135deg, #2563eb, #1e40af); border-radius: var(--radius); color: white; padding: 64px 32px; margin-bottom: 40px; text-align: center; }
.hero h1 { font-size: 36px; margin: 0 0 12px; }
.hero p { font-size: 18px; opacity: 0.9; margin: 0 0 24px; }

.section { margin-bottom: 48px; }
.section h2 { margin-bottom: 16px; }

.category-grid { display: flex; flex-wrap: wrap; gap: 10px; }
.category-chip { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: 999px; padding: 8px 16px; color: var(--color-text); font-size: 14px; display: flex; align-items: center; gap: 8px; }
.category-count { background: var(--color-bg); border-radius: 999px; padding: 2px 8px; font-size: 12px; color: var(--color-text-muted); }

.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.step { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 24px; }
.step-number { display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 32px; border-radius: 50%; background: var(--color-primary); color: white; font-weight: 700; margin-bottom: 12px; }

/* Search bar */
.search-bar { display: flex; gap: 10px; margin-bottom: 24px; flex-wrap: wrap; }
.search-input, .search-select, .form-control { border: 1px solid var(--color-border); border-radius: 8px; padding: 10px 12px; font-size: 14px; background: var(--color-surface); color: var(--color-text); }
.search-input { flex: 2; min-width: 200px; }
.search-select { flex: 1; min-width: 160px; }
.search-location { flex: 1; min-width: 140px; }

/* Task grid / cards */
.task-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.task-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 18px; display: block; color: var(--color-text); box-shadow: var(--shadow); }
.task-card:hover { text-decoration: none; border-color: var(--color-primary); }
.task-card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.task-category { font-size: 12px; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.04em; }
.task-title { margin: 4px 0 8px; font-size: 17px; }
.task-description { color: var(--color-text-muted); font-size: 14px; margin: 0 0 14px; }
.task-card-footer { display: flex; justify-content: space-between; font-size: 13px; color: var(--color-text-muted); flex-wrap: wrap; gap: 6px; }
.task-price { font-weight: 700; color: var(--color-text); }

.task-status, .app-status { font-size: 12px; padding: 3px 10px; border-radius: 999px; font-weight: 600; }
.status-open { background: #dcfce7; color: #166534; }
.status-created { background: #e0e7ff; color: #3730a3; }
.status-assigned { background: #fef3c7; color: #92400e; }
.status-completed { background: #dbeafe; color: #1e40af; }
.status-cancelled { background: #fee2e2; color: #991b1b; }
.status-pending { background: #fef3c7; color: #92400e; }
.status-accepted { background: #dcfce7; color: #166534; }
.status-rejected { background: #fee2e2; color: #991b1b; }
.status-withdrawn { background: #f1f5f9; color: #475569; }

/* Task details */
.task-details-main { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 28px; }
.task-details-description { white-space: pre-wrap; color: var(--color-text); line-height: 1.6; }
.task-meta { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; margin: 20px 0; }
.task-meta dt { font-size: 12px; color: var(--color-text-muted); text-transform: uppercase; }
.task-meta dd { margin: 4px 0 0; font-weight: 600; }
.task-owner-actions { display: flex; gap: 10px; margin: 16px 0 24px; }

.apply-box { background: var(--color-bg); border-radius: var(--radius); padding: 20px; margin-top: 20px; }
.apply-box textarea, .apply-box input { width: 100%; margin-bottom: 10px; }

.application-list { list-style: none; padding: 0; display: flex; flex-direction: column; gap: 12px; }
.application-item { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 16px; display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }

/* Forms */
.form-page { max-width: 640px; }
.form-group { margin-bottom: 16px; display: flex; flex-direction: column; gap: 6px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-control { width: 100%; }
label { font-size: 13px; font-weight: 600; color: var(--color-text-muted); }

/* Auth */
.auth-page { display: flex; justify-content: center; padding: 40px 0; }
.auth-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 32px; width: 100%; max-width: 400px; box-shadow: var(--shadow); }
.auth-switch { text-align: center; margin-top: 16px; font-size: 14px; color: var(--color-text-muted); }

/* Tabs */
.tabs { display: flex; gap: 8px; margin: 20px 0; border-bottom: 1px solid var(--color-border); }
.tab { background: none; border: none; padding: 10px 4px; margin-right: 16px; font-weight: 600; color: var(--color-text-muted); cursor: pointer; border-bottom: 2px solid transparent; }
.tab.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }

/* Misc */
.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.empty-state { text-align: center; padding: 60px 20px; color: var(--color-text-muted); }
.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 14px; }
.alert-error { background: #fee2e2; color: #991b1b; }
.pagination { display: flex; justify-content: center; align-items: center; gap: 16px; margin-top: 24px; }

.loading-state { display: flex; align-items: center; gap: 10px; color: var(--color-text-muted); padding: 32px 0; }
.spinner { width: 18px; height: 18px; border: 2px solid var(--color-border); border-top-color: var(--color-primary); border-radius: 50%; animation: spin 0.7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.modal-backdrop { position: fixed; inset: 0; background: rgba(15, 23, 42, 0.5); display: flex; align-items: center; justify-content: center; z-index: 50; }
.modal-panel { background: var(--color-surface); border-radius: var(--radius); width: 100%; max-width: 420px; padding: 20px; }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.modal-close { background: none; border: none; cursor: pointer; font-size: 16px; }

@media (max-width: 640px) {
  .form-row, .steps-grid { grid-template-columns: 1fr; }
  .navbar-links { display: none; }
}