:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --border-color: rgba(255, 255, 255, 0.1);
    --primary: #10b981;
    --primary-hover: #059669;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --sidebar-bg: rgba(15, 23, 42, 0.8);
    --error: #ef4444;
    --success: #10b981;
}

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

body {
    background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
}

/* Layout */
.app-container {
    display: flex;
    width: 100%;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    backdrop-filter: blur(12px);
    border-right: 1px solid var(--border-color);
    padding: 2rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 12px;
}

.logo {
    width: 32px;
    height: 32px;
    background: var(--primary);
    border-radius: 8px;
    box-shadow: 0 0 15px rgba(16, 185, 129, 0.4);
}

.brand h1 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #fff;
    letter-spacing: -0.02em;
}

nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nav-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    text-align: left;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: #fff;
}

.nav-btn.active {
    background: rgba(16, 185, 129, 0.15);
    color: var(--primary);
    border-left: 3px solid var(--primary);
    border-radius: 0 8px 8px 0;
}

.content {
    flex: 1;
    padding: 2rem 3rem;
    overflow-y: auto;
}

.tab-pane {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-pane.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

h2 {
    font-size: 1.8rem;
    font-weight: 600;
}

h3 {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 1rem;
    color: #e2e8f0;
}

/* Glassmorphism Cards */
.card {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.status-card {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 3rem;
    align-items: start;
}

.qr-placeholder {
    background: #fff;
    border-radius: 12px;
    padding: 1rem;
    min-height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #333;
    font-weight: 500;
    text-align: center;
}

#qr-container img {
    width: 100%;
    height: auto;
    border-radius: 8px;
}

.logs {
    margin-top: 1.5rem;
    background: #000;
    border-radius: 8px;
    padding: 1rem;
    height: 150px;
    overflow-y: auto;
    font-family: monospace;
    font-size: 0.85rem;
}

.log-entry { margin-bottom: 4px; }
.log-entry.system { color: #8b5cf6; }
.log-entry.info { color: #cbd5e1; }
.log-entry.success { color: var(--success); }

.badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.badge.error { background: rgba(239, 68, 68, 0.2); color: var(--error); border: 1px solid rgba(239, 68, 68, 0.3); }
.badge.success { background: rgba(16, 185, 129, 0.2); color: var(--success); border: 1px solid rgba(16, 185, 129, 0.3); }

/* Buttons & Inputs */
.primary-btn {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

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

.secondary-btn {
    background: rgba(255,255,255,0.1);
    color: #fff;
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.secondary-btn:hover { background: rgba(255,255,255,0.2); }

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

label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

input, textarea {
    width: 100%;
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    color: #fff;
    font-size: 1rem;
    transition: border 0.2s;
}

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

.mt-2 { margin-top: 1rem; }
.mt-4 { margin-top: 2rem; }
.text-center { text-align: center; }

/* Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

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

.data-table th {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.9rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    z-index: 100;
    align-items: center;
    justify-content: center;
}

.modal.active { display: flex; }

.modal-content {
    width: 400px;
    position: relative;
}

.close-modal {
    position: absolute;
    top: 1rem; right: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
}

.close-modal:hover { color: #fff; }