:root {
    --primary-color: #e53935;
    --primary-dark: #c62828;
    --secondary-color: #1565c0;
    --success-color: #2e7d32;
    --warning-color: #f57c00;
    --danger-color: #d32f2f;
    --text-primary: #212121;
    --text-secondary: #757575;
    --background: #f5f5f5;
    --surface: #ffffff;
    --border: #e0e0e0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
}

.app-container {
    max-width: 600px;
    margin: 0 auto;
    background: var(--background);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

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

.logo img {
    width: 32px;
    height: 32px;
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 600;
}

.offline-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    background: rgba(255,255,255,0.2);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.status-dot.online {
    background: #4caf50;
    box-shadow: 0 0 4px #4caf50;
}

.status-dot.offline {
    background: #ff9800;
}

.main-content {
    flex: 1;
    padding: 1rem;
}

.card {
    background: var(--surface);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    margin-bottom: 1rem;
}

.card h2 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

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

.btn-primary,
.btn-secondary {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, opacity 0.2s;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    opacity: 0.9;
}

.btn-block {
    width: 100%;
    margin-top: 0.5rem;
}

.btn-text {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    font-size: 0.875rem;
    margin-top: 1rem;
}

.btn-text:hover {
    text-decoration: underline;
}

.divider {
    text-align: center;
    margin: 1.5rem 0;
    color: var(--text-secondary);
    position: relative;
}

.divider::before,
.divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 45%;
    height: 1px;
    background: var(--border);
}

.divider::before {
    left: 0;
}

.divider::after {
    right: 0;
}

.request-card {
    background: var(--surface);
    border-left: 4px solid var(--primary-color);
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 8px;
}

.urgency-emergency {
    border-left-color: var(--danger-color);
    background: #ffebee;
}

.urgency-urgent {
    border-left-color: var(--warning-color);
}

.donor-list {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.alert {
    padding: 0.75rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.alert-success {
    background: #e8f5e8;
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

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

.app-footer {
    text-align: center;
    padding: 1rem;
    color: var(--text-secondary);
    font-size: 0.75rem;
    border-top: 1px solid var(--border);
}

@media (max-width: 480px) {
    .card {
        padding: 1rem;
    }
    
    .btn-primary,
    .btn-secondary {
        padding: 0.6rem 1rem;
    }
}