:root {
    --bg: #f4f7ff;
    --surface: #ffffff;
    --text: #1f2a44;
    --muted: #6b7898;
    --primary: #5b7cfa;
    --primary-dark: #3f5fe0;
    --accent: #ff8fab;
    --accent-2: #7ee081;
    --accent-3: #ffd166;
    --danger: #ff5a5f;
    --warning: #ffc857;
    --border: #e3e9ff;
    --shadow: 0 10px 30px rgba(63, 95, 224, 0.12);
    --radius: 16px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Nunito', sans-serif;
    background: linear-gradient(135deg, #eef3ff 0%, #fff5fb 50%, #f0fff4 100%);
    color: var(--text);
    min-height: 100vh;
}

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

.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.brand {
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--text);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.nav-links a {
    font-weight: 700;
    color: var(--muted);
    text-decoration: none;
}

.nav-links a:hover { color: var(--primary-dark); }

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1.5rem;
}

.hero {
    text-align: center;
    padding: 3rem 1rem;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    margin: 0 0 0.5rem;
}

.hero p {
    color: var(--muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 1.5rem;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    box-shadow: var(--shadow);
}

.card h2, .card h3 { margin-top: 0; }

.card-link {
    display: block;
    color: inherit;
    text-decoration: none;
    transition: transform 0.15s ease;
}

.card-link:hover {
    transform: translateY(-2px);
    text-decoration: none;
}

.btn {
    display: inline-block;
    border: none;
    border-radius: 999px;
    padding: 0.75rem 1.25rem;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    text-decoration: none;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover { transform: translateY(-1px); text-decoration: none; }

.btn-primary {
    background: linear-gradient(135deg, var(--primary), #8b5cf6);
    color: white;
    box-shadow: 0 8px 20px rgba(91, 124, 250, 0.35);
}

.btn-secondary {
    background: white;
    color: var(--primary-dark);
    border: 2px solid var(--border);
}

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

.btn-small {
    padding: 0.45rem 0.9rem;
    font-size: 0.9rem;
}

.form-card {
    max-width: 480px;
    margin: 2rem auto;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-weight: 700;
    margin-bottom: 0.35rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: 12px;
    font-family: inherit;
    font-size: 1rem;
    background: #fbfcff;
}

.form-group textarea { min-height: 100px; resize: vertical; }

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

.checkbox-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.checkbox-row input { width: auto; }

.alert {
    padding: 0.85rem 1rem;
    border-radius: 12px;
    margin-bottom: 1rem;
    font-weight: 600;
}

.alert-success {
    background: #e8fff0;
    color: #1f7a3f;
    border: 1px solid #b8f0cb;
}

.alert-error {
    background: #fff0f0;
    color: #b42318;
    border: 1px solid #ffc9c9;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.task-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.task-item {
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: 14px;
    padding: 1rem 1.1rem;
    box-shadow: var(--shadow);
}

.task-item.past-due {
    border-color: #ffb3b5;
    background: #fff5f5;
}

.task-item.due-today {
    border-color: #ffe08a;
    background: #fffbea;
}

.task-item h3 {
    margin: 0 0 0.35rem;
    font-size: 1.1rem;
}

.task-meta {
    color: var(--muted);
    font-size: 0.92rem;
}

.task-actions {
    margin-top: 0.75rem;
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.badge {
    display: inline-block;
    padding: 0.2rem 0.55rem;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 700;
    background: #eef2ff;
    color: var(--primary-dark);
}

.badge-locked { background: #ffe8f0; color: #c2255c; }
.badge-done { background: #e8fff0; color: #1f7a3f; }

.attachments {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 0.75rem;
}

.attachments img {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: 10px;
    border: 2px solid var(--border);
}

.empty-state {
    text-align: center;
    padding: 2rem;
    color: var(--muted);
}

.inline-form { display: inline; }

@media (max-width: 640px) {
    .form-row { grid-template-columns: 1fr; }
    .page-header { flex-direction: column; align-items: flex-start; }
}