:root {
    --bg-color: #f4f6f9;
    --card-bg: #ffffff;
    --primary: #1b99bd;
    --primary-hover: #157a96;
    --text-main: #333333;
    --text-muted: #666666;
    --border: #e0e0e0;
    --danger: #e74c3c;
    --warning: #f39c12;
    --success: #2ecc71;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-family);
    margin: 0;
    padding: 0;
    line-height: 1.5;
}

/* Navbar */
.navbar {
    background-color: var(--card-bg);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid var(--primary);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
.navbar-brand {
    display: flex;
    align-items: center;
}
.navbar-brand img {
    height: 40px;
}
.navbar-user { color: var(--text-main); font-size: 0.9rem; }
.navbar-user a { color: var(--primary); text-decoration: none; margin-left: 10px; font-weight: 500; }
.navbar-user a:hover { color: var(--primary-hover); }

/* Login */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: calc(100vh - 80px);
}
.login-box {
    background: var(--card-bg);
    padding: 3rem 2.5rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    border-top: 4px solid var(--primary);
    width: 100%;
    max-width: 420px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    text-align: center;
}
.login-box img {
    height: 50px;
    margin-bottom: 2rem;
}
.login-box h2 { color: var(--text-main); }
.form-group { margin-bottom: 1.2rem; text-align: left; }
.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}
.form-group input {
    width: 100%;
    padding: 0.8rem;
    background: #ffffff;
    border: 1px solid var(--border);
    color: var(--text-main);
    border-radius: 4px;
    box-sizing: border-box;
}
.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(27, 153, 189, 0.2);
}
.btn {
    width: 100%;
    padding: 0.8rem;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    font-size: 1.05rem;
    transition: background-color 0.2s;
    margin-top: 1rem;
}
.btn:hover { background-color: var(--primary-hover); }
.error-msg {
    background: rgba(231, 76, 60, 0.1);
    color: var(--danger);
    padding: 0.8rem;
    border-radius: 4px;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(231, 76, 60, 0.3);
    font-size: 0.9rem;
}

/* Dashboard */
.container { padding: 2rem; max-width: 1200px; margin: 0 auto; }
.dash-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}
.dash-header h1 { margin: 0; font-size: 1.8rem; color: var(--text-main); }
.btn-small { width: auto; padding: 0.5rem 1.2rem; margin-top: 0; }

.vehicle-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}
.vehicle-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
    position: relative;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    display: flex;
    align-items: center;
}
.vehicle-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    border-color: var(--primary);
}
.vehicle-icon {
    width: 50px;
    height: 50px;
    background: rgba(27, 153, 189, 0.1);
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-right: 1.5rem;
}
.vehicle-icon svg {
    width: 30px;
    height: 30px;
    fill: var(--primary);
}
.vehicle-info h3 { margin: 0 0 0.2rem 0; color: var(--text-main); font-size: 1.2rem; }
.vehicle-info p { margin: 0; color: var(--text-muted); font-size: 0.85rem; line-height: 1.4; }
.status-badge {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 1.2rem;
}
.status-ok { color: var(--success); }
.engine-error {
    color: var(--danger);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 1; text-shadow: 0 0 0 rgba(231,76,60,0); }
    50% { transform: scale(1.3); opacity: 0.8; text-shadow: 0 0 10px rgba(231,76,60,0.5); }
    100% { transform: scale(1); opacity: 1; text-shadow: 0 0 0 rgba(231,76,60,0); }
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    backdrop-filter: blur(2px);
    overflow-y: auto; 
}
.modal-content {
    background-color: var(--card-bg);
    margin: 4% auto;
    padding: 2.5rem;
    border: 1px solid var(--border);
    border-top: 4px solid var(--primary);
    width: 95%;
    max-width: 900px;
    border-radius: 8px;
    position: relative;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}
.close {
    color: var(--text-muted);
    position: absolute;
    right: 1.5rem;
    top: 1.5rem;
    font-size: 32px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
}
.close:hover { color: var(--text-main); }

.modal-title {
    margin-top: 0;
    color: var(--text-main);
    font-size: 1.6rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 12px;
}
.modal-title svg {
    width: 28px;
    height: 28px;
    fill: var(--primary);
}

.live-data-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}
.data-card {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.data-card h3 { 
    margin: 0 0 10px 0; 
    color: var(--text-muted); 
    font-size: 0.85rem; 
    letter-spacing: 1px;
}
.data-value {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary);
}
.data-card.highlight {
    border-color: var(--primary);
    box-shadow: 0 0 10px rgba(27, 153, 189, 0.1);
}
.data-list {
    text-align: left;
    margin: 0;
    padding: 0;
    list-style: none;
}
.data-list li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    font-size: 0.95rem;
}
.data-list li:last-child { border-bottom: none; }
.data-list .label { color: var(--text-muted); }
.data-list .val { color: var(--text-main); font-weight: 500; }

/* DTC Section */
.dtc-section {
    background: #ffffff;
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border);
}
.dtc-section h3 {
    margin-top: 0;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 10px;
}
.badge {
    background: var(--danger);
    color: white;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: bold;
}
.dtc-item {
    background: #ffffff;
    border: 1px solid var(--danger);
    border-left: 4px solid var(--danger);
    padding: 1rem 1.5rem;
    border-radius: 4px;
    margin-bottom: 0.8rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.2s;
}
.dtc-item:hover { background: rgba(231, 76, 60, 0.05); }
.dtc-code { font-weight: bold; color: var(--danger); font-size: 1.1rem; }
.dtc-date { color: var(--text-muted); font-size: 0.85rem; }
.dtc-empty { color: var(--success); font-weight: 500; padding: 1rem 0; display:flex; align-items:center; gap: 8px; }

/* Modal over Modal (DTC Info) */
#dtcModal .modal-content { max-width: 500px; border-top: 4px solid var(--danger); }
.dtc-info-box { background: #f8f9fa; padding: 1.5rem; border-radius: 4px; margin-bottom: 1.5rem; border: 1px solid var(--border); }
.dtc-info-label { color: var(--danger); font-size: 0.85rem; text-transform: uppercase; font-weight: bold; margin-bottom: 5px; }
.dtc-info-text { color: var(--text-main); margin-bottom: 1.5rem; line-height: 1.6; }

@media (max-width: 768px) {
    .live-data-grid { grid-template-columns: 1fr; }
    .modal-content { margin: 5% auto; padding: 1.5rem; width: 92%; }
}

.navbar-brand { gap: 20px; }
.navbar-filter {
    background: #f4f6f9;
    border: 1px solid var(--border);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--text-main);
    outline: none;
    cursor: pointer;
    font-weight: 500;
}
.navbar-filter:focus { border-color: var(--primary); }
.vehicle-card.has-error {
    border: 2px solid var(--danger);
    background-color: rgba(231, 76, 60, 0.03);
    box-shadow: 0 0 10px rgba(231, 76, 60, 0.1);
}