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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #64748b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --bg: #f1f5f9;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-light: #64748b;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 30px 0 20px;
}

header h1 {
    font-size: 2rem;
    color: var(--text);
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-light);
    font-size: 1rem;
}

.actions-bar {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 20px;
    justify-content: center;
}

.btn {
    padding: 10px 18px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

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

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

.btn-danger {
    background: var(--danger);
    color: white;
}
.btn-danger:hover { background: #dc2626; }

.btn-edit {
    background: var(--warning);
    color: white;
}
.btn-edit:hover { background: #d97706; }

.filters {
    display: flex;
    gap: 12px;
    margin-bottom: 25px;
    flex-wrap: wrap;
}

.filters input, .filters select {
    flex: 1;
    min-width: 200px;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    background: white;
    transition: border-color 0.2s;
}

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

.devices-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 18px;
}

.device-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary);
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
}

.device-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.device-card .card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
    gap: 10px;
}

.device-card h3 {
    font-size: 1.2rem;
    color: var(--text);
    word-break: break-word;
}

.device-card .type-badge {
    background: var(--primary);
    color: white;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
}

.device-card .meta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 12px;
    font-size: 0.85rem;
    color: var(--text-light);
}

.device-card .meta span {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.device-card .content {
    background: var(--bg);
    padding: 12px;
    border-radius: 8px;
    font-size: 0.9rem;
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 180px;
    overflow-y: auto;
    margin-bottom: 12px;
    flex-grow: 1;
}

.device-card .notes {
    font-size: 0.85rem;
    color: var(--text-light);
    font-style: italic;
    margin-bottom: 12px;
    padding: 8px;
    background: #fef3c7;
    border-radius: 6px;
}

.device-card .card-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}

.device-card .card-actions .btn {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
    background: white;
    border-radius: 12px;
    border: 2px dashed var(--border);
}

.empty-state p { margin-bottom: 8px; }

/* Modal */
.modal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
    overflow-y: auto;
}

.modal-content {
    background: white;
    border-radius: 12px;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

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

.modal-header h2 {
    font-size: 1.3rem;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text-light);
    line-height: 1;
}

.close-btn:hover { color: var(--text); }

form {
    padding: 24px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color 0.2s;
}

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

.form-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 20px;
}

footer {
    text-align: center;
    padding: 30px 20px;
    color: var(--text-light);
    font-size: 0.85rem;
}

@media (max-width: 600px) {
    header h1 { font-size: 1.5rem; }
    .devices-list { grid-template-columns: 1fr; }
    .actions-bar { flex-direction: column; }
    .btn { width: 100%; justify-content: center; }
}