/* IoT Platform - Style */
:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --success: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;
    --bg: #f5f7fa;
    --card-bg: #ffffff;
    --text: #1f2937;
    --text-light: #6b7280;
    --border: #e5e7eb;
    --radius: 8px;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

/* Navbar */
.navbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}
.nav-title { font-size: 18px; font-weight: 600; }
.nav-right { display: flex; align-items: center; gap: 8px; }
.nav-right span { margin-right: 8px; color: var(--text-light); font-size: 14px; }

/* Container */
.container { max-width: 960px; margin: 0 auto; padding: 20px; }
.container h2 { font-size: 18px; margin: 20px 0 12px; padding-bottom: 8px; border-bottom: 2px solid var(--primary); }
.container h2:first-child { margin-top: 0; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 8px 16px;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: opacity 0.2s;
    line-height: 1.4;
}
.btn:hover { opacity: 0.85; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-admin { background: #7c3aed; color: #fff; }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-block { display: block; width: 100%; }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 4px; font-weight: 500; font-size: 14px; }
.form-group input, .input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}
.form-group input:focus, .input:focus { border-color: var(--primary); }
.form-inline {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    margin-bottom: 12px;
}
.form-inline .input { width: auto; min-width: 100px; }
select.input { padding: 8px 12px; }

/* Messages */
.msg { margin-top: 8px; font-size: 13px; color: var(--danger); min-height: 20px; }
.empty-msg { color: var(--text-light); font-size: 14px; padding: 20px 0; text-align: center; }

/* Login Page */
.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}
.login-container {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 40px;
    width: 360px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}
.login-header { text-align: center; margin-bottom: 30px; }
.login-header h1 { font-size: 24px; margin-bottom: 8px; }
.login-header p { color: var(--text-light); font-size: 14px; }

/* Device Grid */
.device-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 12px;
}
.device-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--border);
}
.device-card.status-online { border-left-color: var(--success); }
.device-card.status-offline { border-left-color: var(--danger); opacity: 0.7; }
.device-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.device-name { font-weight: 600; font-size: 16px; }
.device-status { font-size: 12px; padding: 2px 8px; border-radius: 12px; }
.device-status.status-online { background: #dcfce7; color: var(--success); }
.device-status.status-offline { background: #fee2e2; color: var(--danger); }
.device-id, .device-type { font-size: 12px; color: var(--text-light); margin-top: 2px; }
.device-owner { font-size: 12px; color: var(--primary); margin-top: 4px; }
.device-actions { margin-top: 12px; display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }

/* Lock Badges */
.lock-badge { font-size: 12px; padding: 2px 8px; border-radius: 12px; }
.lock-self { background: #dbeafe; color: var(--primary); }
.lock-other { background: #fef3c7; color: var(--warning); }

/* Control Panel */
.control-header { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.control-group {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 16px;
    box-shadow: var(--shadow);
}
.control-group h3 { font-size: 15px; margin-bottom: 12px; color: var(--text-light); }
.control-row {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}
.control-row input { width: 80px; padding: 6px 8px; }
.control-row label { font-size: 13px; }

/* Sensor Display */
.sensor-display {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 8px;
    margin-bottom: 12px;
}
.sensor-item {
    background: var(--bg);
    padding: 8px 12px;
    border-radius: var(--radius);
    display: flex;
    justify-content: space-between;
    font-size: 13px;
}
.sensor-item strong { color: var(--primary); }

/* Log Box */
.log-section { margin-top: 20px; }
.log-box {
    background: #1e1e1e;
    color: #d4d4d4;
    border-radius: var(--radius);
    padding: 12px;
    font-family: "Consolas", "Monaco", monospace;
    font-size: 12px;
    max-height: 200px;
    overflow-y: auto;
}

/* Share List */
.share-list { margin-bottom: 20px; }
.share-item {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 12px 16px;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: var(--shadow);
}
.share-device { font-weight: 500; }
.share-arrow { color: var(--text-light); }
.share-user { color: var(--primary); flex: 1; }

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}
.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 16px;
    text-align: center;
    box-shadow: var(--shadow);
}
.stat-value { font-size: 24px; font-weight: 700; color: var(--primary); }
.stat-label { font-size: 12px; color: var(--text-light); margin-top: 4px; }

/* Data Table */
.table-wrap { overflow-x: auto; margin-bottom: 20px; }
.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}
.data-table th, .data-table td {
    padding: 10px 12px;
    text-align: left;
    font-size: 13px;
    border-bottom: 1px solid var(--border);
}
.data-table th { background: var(--bg); font-weight: 600; }

/* Modal */
.modal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 200;
}
.modal-content {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 30px;
    width: 340px;
    max-width: 90vw;
}
.modal-content h2 { margin-bottom: 20px; font-size: 18px; }

/* Responsive */
@media (max-width: 600px) {
    .container { padding: 12px; }
    .device-grid { grid-template-columns: 1fr; }
    .form-inline { flex-direction: column; }
    .form-inline .input { width: 100%; }
    .login-container { width: 90vw; padding: 24px; }
    .nav-right { flex-wrap: wrap; }
    .stats-grid { grid-template-columns: repeat(3, 1fr); }
    .data-table { font-size: 11px; }
    .data-table th, .data-table td { padding: 6px 8px; }
}