:root {
    --bg-main: #f0f2f5;
    --sidebar-bg: #ffffff;
    --border-color: #eaeaea;
    --primary-color: #25D366;
    --primary-dark: #128C7E;
    --text-dark: #333333;
    --text-muted: #888888;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-dark);
}

.hidden {
    display: none !important;
}

/* Modal de Autenticação */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.4);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.modal-content {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.modal-content .logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
    color: var(--primary-dark);
}

.logo-icon {
    width: 32px; height: 32px;
    background: var(--primary-color);
    border-radius: 50%;
}
.logo-icon.small {
    width: 24px; height: 24px;
}

.modal-content p {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 20px;
    line-height: 1.5;
}

.modal-content input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    margin-bottom: 10px;
    outline: none;
    transition: border 0.2s;
}
.modal-content input:focus {
    border-color: var(--primary-color);
}

.modal-content button {
    width: 100%;
    padding: 12px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.2s;
}
.modal-content button:hover {
    background: var(--primary-dark);
}

.error-msg {
    color: #e74c3c !important;
    font-size: 13px !important;
    margin-bottom: 15px !important;
}

/* App Container */
.app-container {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--primary-dark);
    font-weight: 700;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-nav {
    flex: 1;
    padding: 24px 16px;
}

.nav-section-title {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.nav-item {
    display: block;
    padding: 12px 16px;
    color: var(--text-dark);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    border-radius: 8px;
    margin-bottom: 4px;
    transition: background 0.2s;
}

.nav-item:hover {
    background: var(--bg-main);
}

.nav-item.active {
    background: #e8f9f0;
    color: var(--primary-dark);
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-color);
}

.logout-btn {
    width: 100%;
    background: transparent;
    border: 1px solid var(--border-color);
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-muted);
    font-weight: 500;
    transition: all 0.2s;
}
.logout-btn:hover {
    background: #f8f8f8;
    color: var(--text-dark);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.topbar {
    background: white;
    padding: 16px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.topbar h1 {
    font-size: 18px;
    font-weight: 600;
}

.status-indicator {
    background: #e6fced;
    color: var(--primary-dark);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.content-wrapper {
    padding: 32px;
    max-width: 1100px;
    margin: 0 auto;
    width: 100%;
}

/* Instances List */
.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.instances-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.instance-card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow);
    cursor: pointer;
    border: 1px solid var(--border-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

.instance-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.instance-card .name {
    font-weight: 600;
    font-size: 16px;
    margin-bottom: 8px;
    color: var(--primary-dark);
}

.instance-card .status {
    font-size: 13px;
    color: var(--text-muted);
    display: inline-block;
    padding: 4px 8px;
    background: #f0f0f0;
    border-radius: 4px;
}
.instance-card .status.CONNECTED { background: #e6fced; color: #128c7e; }
.instance-card .status.QR_READY { background: #fff3cd; color: #856404; }

/* Form Nova */
.criar-instancia-form {
    background: white;
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 24px;
    display: flex;
    gap: 12px;
    border: 1px dashed var(--primary-color);
}
.criar-instancia-form input {
    flex: 1;
    padding: 10px 16px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    outline: none;
}
.btn-primary, .btn-success { background: var(--primary-color); color: white; border: none; padding: 10px 20px; border-radius: 6px; cursor: pointer; font-weight: 600; }
.btn-secondary, .btn-back { background: transparent; color: var(--text-muted); border: 1px solid var(--border-color); padding: 10px 20px; border-radius: 6px; cursor: pointer; }

/* Detail Panel */
.detail-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
}

.detail-grid {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 24px;
}

.detail-card {
    background: white;
    border-radius: 12px;
    padding: 32px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.info-card h3 {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 24px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.field-group {
    margin-bottom: 24px;
}

.field-group label {
    display: block;
    font-size: 13px;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-weight: 500;
}

.copy-box {
    display: flex;
}

.copy-box input {
    flex: 1;
    background: #f8f9fa;
    border: 1px solid var(--border-color);
    padding: 12px;
    border-radius: 6px;
    color: #555;
    font-family: monospace;
    font-size: 13px;
    outline: none;
}

.plain-input {
    width: 100%;
    background: #f8f9fa;
    border: 1px solid var(--border-color);
    padding: 12px;
    border-radius: 6px;
}

.qr-card {
    text-align: center;
}
.qr-card h3 { font-size: 18px; margin-bottom: 8px; }
.qr-subtitle { font-size: 14px; color: var(--text-muted); margin-bottom: 24px; }

.qr-container {
    background: white;
    padding: 16px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    min-height: 250px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.qr-container img {
    max-width: 100%;
    border-radius: 8px;
}

.st-connected {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 20px;
}

.loader-circular {
    width: 40px; height: 40px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* Responsividade Básica */
@media (max-width: 900px) {
    .detail-grid {
        grid-template-columns: 1fr;
    }
}