:root {
    --bg-dark: #0f172a;
    --bg-surface: #1e293b;
    --primary: #22c55e;
    --primary-hover: #16a34a;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --danger: #ef4444;
    --border: #334155;
    --card-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body.dark-mode {
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}

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

.logo i {
    font-size: 2.5rem;
    color: var(--primary);
    filter: drop-shadow(0 0 8px rgba(34, 197, 94, 0.4));
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

.logo h1 span {
    color: var(--primary);
}

/* Utils */
.btn {
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    font-size: 0.9rem;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(34, 197, 94, 0.3);
}

.btn-danger {
    background-color: transparent;
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

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

.btn-block {
    width: 100%;
    justify-content: center;
}

.hidden {
    display: none !important;
}

/* Grid & Cards */
.instances-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.instance-card {
    background: var(--bg-surface);
    border-radius: 16px;
    padding: 1.5rem;
    border: 1px solid var(--border);
    transition: var(--transition);
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.instance-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.instance-info h3 {
    font-size: 1.1rem;
    margin-bottom: 0.2rem;
}

.status-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.status-badge.connected { background: rgba(34, 197, 94, 0.15); color: #4ade80; }
.status-badge.disconnected { background: rgba(239, 68, 68, 0.15); color: #f87171; }
.status-badge.qrcode { background: rgba(234, 179, 8, 0.15); color: #facc15; }
.status-badge.connecting { background: rgba(148, 163, 184, 0.15); color: #94a3b8; }

.card-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: auto;
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.8);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: var(--bg-surface);
    margin: 10% auto;
    padding: 2rem;
    border-radius: 20px;
    width: 90%;
    max-width: 450px;
    border: 1px solid var(--border);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { transform: translateY(-50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.close-modal {
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
}

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

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

input, textarea {
    width: 100%;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    padding: 0.8rem;
    border-radius: 10px;
    color: white;
    outline: none;
    transition: var(--transition);
}

input:focus, textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(34, 197, 94, 0.2);
}

/* QR Code Section */
#qr-container {
    text-align: center;
    margin: 1.5rem 0;
}

.qr-wrapper {
    position: relative;
    display: inline-block;
    background: white;
    padding: 1rem;
    border-radius: 12px;
}

#qr-image {
    max-width: 200px;
    display: block;
}

.qr-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255,255,255,0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-dark);
    font-size: 2rem;
}

.qr-instruction {
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.loading-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem;
    color: var(--text-muted);
}

.loading-state i {
    font-size: 2rem;
    margin-bottom: 1rem;
}