@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

:root {
    --bg-main: #0b1120;
    --bg-card: rgba(18, 26, 47, 0.85);
    --bg-card-hover: rgba(26, 38, 68, 0.95);
    --bg-card-solid: #131d35;
    --border-color: rgba(255, 255, 255, 0.08);
    --border-focus: #3b82f6;
    
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-gradient: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
    --accent-glow: rgba(37, 99, 235, 0.25);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.15);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.15);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.15);
    --info: #0ea5e9;
    --info-bg: rgba(14, 165, 233, 0.15);

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-main);
    background-image: 
        radial-gradient(at 0% 0%, rgba(37, 99, 235, 0.12) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(6, 182, 212, 0.08) 0px, transparent 50%);
    background-attachment: fixed;
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

a {
    color: #38bdf8;
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: #7dd3fc;
}

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

/* Sidebar */
.sidebar {
    width: 270px;
    background: rgba(15, 23, 42, 0.95);
    border-right: 1px solid var(--border-color);
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    height: 100vh;
    z-index: 100;
    transition: transform 0.3s ease;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 12px 24px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.brand-logo {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px var(--accent-glow);
    color: #fff;
    font-weight: 800;
    font-size: 18px;
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-size: 17px;
    font-weight: 800;
    letter-spacing: -0.01em;
    background: linear-gradient(135deg, #ffffff 40%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-subtitle {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #38bdf8;
    font-weight: 700;
}

.nav-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 1;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.nav-link svg {
    width: 20px;
    height: 20px;
    opacity: 0.8;
}

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

.nav-link.active {
    color: #ffffff;
    background: var(--primary);
    box-shadow: 0 4px 14px var(--accent-glow);
    font-weight: 600;
}

.nav-link.active svg {
    opacity: 1;
}

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

.user-badge {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.03);
}

.user-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: #334155;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: #e2e8f0;
}

.user-info {
    overflow: hidden;
}

.user-name {
    font-size: 13px;
    font-weight: 600;
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
}

.user-role {
    font-size: 11px;
    color: #38bdf8;
}

/* Main Content Area */
.main-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.top-bar {
    height: 70px;
    border-bottom: 1px solid var(--border-color);
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(16px);
    position: sticky;
    top: 0;
    z-index: 90;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 8px;
}

.top-bar-title {
    font-size: 20px;
    font-weight: 700;
}

.content-body {
    padding: 32px;
    flex: 1;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* Alert / Flash */
.flash-alert {
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    font-weight: 500;
    animation: fadeIn 0.3s ease;
}

.flash-alert.success { background: var(--success-bg); border: 1px solid var(--success); color: #34d399; }
.flash-alert.error { background: var(--danger-bg); border: 1px solid var(--danger); color: #f87171; }
.flash-alert.warning { background: var(--warning-bg); border: 1px solid var(--warning); color: #fbbf24; }

/* Metrics Grid */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.metric-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 22px;
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow-card);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.metric-card:hover {
    transform: translateY(-3px);
    border-color: rgba(255, 255, 255, 0.18);
    background: var(--bg-card-hover);
}

.metric-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-gradient);
    opacity: 0.8;
}

.metric-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.metric-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.metric-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: rgba(37, 99, 235, 0.15);
    color: #38bdf8;
    display: flex;
    align-items: center;
    justify-content: center;
}

.metric-value {
    font-size: 28px;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: #ffffff;
    line-height: 1.2;
}

.metric-sub {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 6px;
}

/* Cards & Containers */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    box-shadow: var(--shadow-card);
    backdrop-filter: blur(12px);
    margin-bottom: 30px;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.card-title {
    font-size: 18px;
    font-weight: 700;
}

.card-desc {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* Forms & Inputs */
.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 8px;
    color: #cbd5e1;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="url"],
select,
textarea {
    width: 100%;
    padding: 12px 16px;
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: #ffffff;
    font-family: inherit;
    font-size: 14px;
    transition: var(--transition);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.25);
    background: rgba(15, 23, 42, 0.95);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: var(--primary-gradient);
    color: #ffffff;
    box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-primary:hover {
    opacity: 0.95;
    transform: translateY(-1px);
    box-shadow: 0 6px 18px var(--accent-glow);
    color: #ffffff;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.14);
    color: #ffffff;
}

.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #059669; color: #fff; }

.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #dc2626; color: #fff; }

.btn-sm {
    padding: 8px 14px;
    font-size: 12px;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 13px;
}

thead {
    background: rgba(15, 23, 42, 0.9);
}

th {
    padding: 14px 16px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 11px;
    border-bottom: 1px solid var(--border-color);
}

td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    color: #e2e8f0;
}

tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 9999px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.badge-success { background: var(--success-bg); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.3); }
.badge-warning { background: var(--warning-bg); color: #fbbf24; border: 1px solid rgba(245, 158, 11, 0.3); }
.badge-danger { background: var(--danger-bg); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.3); }
.badge-info { background: var(--info-bg); color: #38bdf8; border: 1px solid rgba(14, 165, 233, 0.3); }

/* Link Generator Tool Box */
.link-generator-box {
    background: linear-gradient(145deg, rgba(30, 41, 59, 0.7), rgba(15, 23, 42, 0.9));
    border: 1px solid rgba(56, 189, 248, 0.25);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.link-output-group {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.link-output-input {
    background: #090e1a !important;
    font-family: monospace;
    color: #38bdf8 !important;
    font-weight: 600;
}

/* QR Code Section */
.qr-container {
    display: flex;
    align-items: center;
    gap: 24px;
    background: rgba(15, 23, 42, 0.6);
    border-radius: var(--radius-md);
    padding: 20px;
    border: 1px solid var(--border-color);
    margin-top: 20px;
}

.qr-preview {
    background: #ffffff;
    padding: 10px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Mobile Responsiveness */
@media (max-width: 900px) {
    .sidebar {
        position: fixed;
        left: -280px;
    }
    .sidebar.open {
        transform: translateX(280px);
    }
    .mobile-menu-btn {
        display: block;
    }
    .content-body {
        padding: 20px 16px;
    }
    .top-bar {
        padding: 0 16px;
    }
    .qr-container {
        flex-direction: column;
        text-align: center;
    }
    .link-output-group {
        flex-direction: column;
    }
}