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

:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #f6821f;
  --primary-dark: #e06f0f;
  --success: #059669;
  --danger: #dc2626;
  --warning: #d97706;
  --border: #e5e7eb;
  --shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
  --radius: 12px;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(180deg, #fff7ed 0%, var(--bg) 35%);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.header {
  text-align: center;
  margin-bottom: 24px;
}

.header h1 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin-bottom: 8px;
}

.subtitle {
  color: var(--muted);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 20px;
}

.card h2 {
  font-size: 1.25rem;
  margin-bottom: 16px;
}

.form-group {
  margin-bottom: 14px;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
}

.required {
  color: var(--danger);
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  font: inherit;
  background: #fff;
}

input:focus,
textarea:focus {
  outline: 2px solid rgba(246, 130, 31, 0.35);
  border-color: var(--primary);
}

.form-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  transform: none;
}

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

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

.btn-secondary {
  background: #eef2f7;
  color: var(--text);
}

.btn-success {
  background: #ecfdf5;
  color: var(--success);
  border: 1px solid #a7f3d0;
}

.btn-warning {
  background: #fffbeb;
  color: var(--warning);
  border: 1px solid #fde68a;
}

.btn-danger {
  background: #fef2f2;
  color: var(--danger);
  border: 1px solid #fecaca;
}

.tasks-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.filters {
  display: flex;
  gap: 8px;
}

.filter-btn {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  border-radius: 999px;
  padding: 6px 14px;
  cursor: pointer;
  font: inherit;
}

.filter-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.loading,
.empty-state {
  text-align: center;
  color: var(--muted);
  padding: 24px 12px;
}

.task-list {
  list-style: none;
}

.task-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 12px;
  background: #fff;
}

.task-item.completed {
  background: #f9fafb;
}

.task-item.completed .task-title {
  text-decoration: line-through;
  color: var(--muted);
}

.task-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
}

.task-title {
  font-size: 1.05rem;
  font-weight: 700;
}

.task-description {
  margin-top: 8px;
  color: var(--muted);
  white-space: pre-wrap;
}

.task-meta {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--muted);
}

.status-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}

.status-badge.pending {
  background: #fffbeb;
  color: var(--warning);
}

.status-badge.completed {
  background: #ecfdf5;
  color: var(--success);
}

.task-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.message {
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 16px;
  font-weight: 600;
}

.message.success {
  background: #ecfdf5;
  color: var(--success);
  border: 1px solid #a7f3d0;
}

.message.error {
  background: #fef2f2;
  color: var(--danger);
  border: 1px solid #fecaca;
}

.hidden {
  display: none !important;
}

.footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 640px) {
  .tasks-header {
    flex-direction: column;
    align-items: stretch;
  }

  .filters {
    justify-content: center;
  }
}