/* ===== VARIABLES ===== */
:root {
    --primary: #3498db;
    --primary-dark: #2980b9;
    --success: #2ecc71;
    --danger: #e74c3c;
    --warning: #f1c40f;
    --info: #17a2b8;
    --dark: #2c3e50;
    --light: #ecf0f1;
    --gray: #95a5a6;
    --white: #ffffff;
    --bg: #f5f6fa;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --radius: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg);
    color: var(--dark);
    line-height: 1.6;
}

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

a:hover {
    text-decoration: underline;
}

/* ===== NAVBAR ===== */
.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    height: 60px;
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-brand a {
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--dark);
}

.navbar-menu {
    display: flex;
    list-style: none;
    gap: 1rem;
}

.navbar-menu a {
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    color: var(--dark);
    transition: background 0.2s;
}

.navbar-menu a:hover,
.navbar-menu a.active {
    background: var(--light);
    text-decoration: none;
}

.navbar-user {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* ===== CONTAINER ===== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    min-height: calc(100vh - 120px);
}

/* ===== PAGE HEADER ===== */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-header h1 {
    font-size: 1.75rem;
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

/* ===== CARDS ===== */
.card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card h2, .card h3 {
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--light);
}

/* ===== STATS GRID ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    text-align: center;
}

.stat-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary);
}

.stat-label {
    color: var(--gray);
    font-size: 0.9rem;
}

.stats-grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
}

.stats-grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.9rem;
    background: var(--light);
    color: var(--dark);
    transition: all 0.2s;
    text-decoration: none;
}

.btn:hover {
    background: #dfe6e9;
    text-decoration: none;
}

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

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

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

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

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
}

.btn-block {
    width: 100%;
}

/* ===== FORMS ===== */
.form-card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2rem;
}

.form-section {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--light);
}

.form-section:last-of-type {
    border-bottom: none;
}

.form-section h3 {
    margin-bottom: 1rem;
    color: var(--primary);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group small {
    display: block;
    margin-top: 0.25rem;
    color: var(--gray);
    font-size: 0.8rem;
}

.form-control,
input[type="text"],
input[type="url"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="datetime-local"],
select,
textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: var(--radius);
    font-size: 1rem;
    transition: border-color 0.2s;
}

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

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.param-row {
    align-items: end;
}

.form-group.checkbox label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.form-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.form-actions .delete-form,
.delete-form {
    margin-left: auto;
    /* if it's outside form-actions, keep it right-aligned */
    margin-top: 1rem;
}

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

.filters-row {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.filters-row input,
.filters-row select {
    max-width: 250px;
}

/* ===== TABLES ===== */
.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--light);
}

.table th {
    background: var(--bg);
    font-weight: 600;
}

.table tr:hover {
    background: #f8f9fa;
}

.table tr.inactive {
    opacity: 0.6;
}

.table-compact th,
.table-compact td {
    padding: 0.5rem;
}

.actions {
    white-space: nowrap;
}

.actions form {
    display: inline;
}

/* ===== BADGES ===== */
.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-success {
    background: #d4edda;
    color: #155724;
}

.badge-danger {
    background: #f8d7da;
    color: #721c24;
}

.badge-warning {
    background: #fff3cd;
    color: #856404;
}

/* ===== ALERTS ===== */
.alert {
    padding: 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.alert-success {
    background: #d4edda;
    color: #155724;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
}

.alert-warning {
    background: #fff3cd;
    color: #856404;
}

.alert-info {
    background: #cce5ff;
    color: #004085;
}

.alert-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0.5;
}

/* ===== PAGINATION ===== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--light);
}

.pagination-info {
    color: var(--gray);
}

/* ===== CODE ===== */
code {
    background: var(--light);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
}

/* ===== CHARTS ===== */
.chart-container {
    height: 300px;
    position: relative;
}

.chart-container-small {
    height: 200px;
}

/* ===== DETAILS ===== */
.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.info-row {
    display: flex;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--light);
}

.info-row:last-child {
    border-bottom: none;
}

.info-label {
    flex: 0 0 150px;
    font-weight: 500;
    color: var(--gray);
}

.info-value {
    flex: 1;
}

.stats-row {
    display: flex;
    gap: 2rem;
    margin-bottom: 1rem;
}

.stat-mini {
    text-align: center;
}

.stat-mini .stat-value {
    font-size: 1.5rem;
}

/* ===== LOGIN PAGE ===== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--dark));
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 1rem;
}

.login-box {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    text-align: center;
}

.login-box h1 {
    margin-bottom: 0.5rem;
}

.login-subtitle {
    color: var(--gray);
    margin-bottom: 2rem;
}

.login-form .form-group {
    text-align: left;
}

/* ===== UTILITIES ===== */
.text-center {
    text-align: center;
}

.text-muted {
    color: var(--gray);
}

.truncate {
    max-width: 200px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.device-stats {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.device-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    background: var(--bg);
    border-radius: var(--radius);
}

.device-item strong {
    margin-left: auto;
}

.copy-btn {
    padding: 0.1rem 0.3rem !important;
}

/* ===== FOOTER ===== */
.footer {
    text-align: center;
    padding: 1rem;
    color: var(--gray);
    font-size: 0.9rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .navbar {
        flex-wrap: wrap;
        height: auto;
        padding: 1rem;
    }
    
    .navbar-menu {
        order: 3;
        width: 100%;
        margin-top: 1rem;
        justify-content: center;
    }
    
    .container {
        padding: 1rem;
    }
    
    .detail-grid,
    .stats-grid-2 {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}