:root {
    --bg-color: #0f172a;
    --text-color: #f8fafc;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --secondary: #ec4899;
    --secondary-hover: #db2777;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --danger: #ef4444;
    --success: #22c55e;
}

body {
    background: linear-gradient(135deg, #020617 0%, #0f172a 100%);
    color: var(--text-color);
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.glass-nav {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
    background: linear-gradient(to right, #3b82f6, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo span {
    font-weight: 300;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--primary);
}

.main-container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
    flex: 1;
    width: 100%;
}

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

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), #60a5fa);
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-hover), #3b82f6);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary), #f472b6);
    color: white;
}

.btn-secondary:hover {
    background: linear-gradient(135deg, var(--secondary-hover), var(--secondary));
    box-shadow: 0 4px 15px rgba(236, 72, 153, 0.4);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-color);
    text-decoration: none;
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
}

.btn-block {
    display: block;
    width: 100%;
}

.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 70vh;
}

.login-card {
    width: 100%;
    max-width: 400px;
}

.subtitle {
    color: #94a3b8;
    margin-bottom: 2rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--glass-border);
    color: white;
    font-family: 'Inter', sans-serif;
    transition: all 0.3s ease;
    box-sizing: border-box;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }

.notifications {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.alert {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    background: var(--glass-bg);
    border-left: 4px solid;
    backdrop-filter: blur(8px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    animation: slideIn 0.3s ease forwards;
    transition: opacity 0.3s ease;
}

.alert-error { border-color: var(--danger); }
.alert-success { border-color: var(--success); }

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Tabs System */
.tab-container {
    padding: 0;
    overflow: hidden;
}

.tabs {
    display: flex;
    border-bottom: 1px solid var(--glass-border);
    background: rgba(0,0,0,0.2);
}

.tab-btn {
    background: transparent;
    border: none;
    outline: none;
    cursor: pointer;
    padding: 1rem 2rem;
    transition: 0.3s;
    font-size: 1rem;
    font-weight: 600;
    color: #94a3b8;
    flex: 1;
}

.tab-btn:hover {
    color: #f8fafc;
    background: rgba(255,255,255,0.05);
}

.tab-btn.active {
    color: var(--primary);
    border-bottom: 2px solid var(--primary);
    background: rgba(59, 130, 246, 0.05);
}

.tab-content {
    display: none;
    padding: 2rem;
    animation: fadeIn 0.4s ease;
}

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

/* File Upload Area */
.upload-area {
    margin-top: 1.5rem;
}

.file-drop-area {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 2rem;
    border: 2px dashed var(--glass-border);
    border-radius: 12px;
    background: rgba(15, 23, 42, 0.3);
    transition: all 0.3s ease;
}

.file-drop-area:hover {
    border-color: var(--primary);
    background: rgba(59, 130, 246, 0.05);
}

.fake-btn {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-weight: 500;
    margin-bottom: 1rem;
}

.file-msg {
    color: #94a3b8;
    font-size: 0.9rem;
}

.file-input {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
    cursor: pointer;
    opacity: 0;
}

/* Admin Grid */
.admin-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2rem;
}
@media (max-width: 768px) {
    .admin-grid {
        grid-template-columns: 1fr;
    }
}

.table-responsive {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

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

.data-table th {
    font-weight: 600;
    color: #cbd5e1;
}

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 99px;
    font-size: 0.8rem;
    font-weight: 600;
}

.badge-admin { background: rgba(236, 72, 153, 0.2); color: #f472b6; }
.badge-user { background: rgba(59, 130, 246, 0.2); color: #60a5fa; }

/* Loading Modal */
.loading-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.loading-content {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 3rem;
    border-radius: 16px;
    text-align: center;
    max-width: 400px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s ease-in-out infinite;
    margin: 0 auto 1.5rem;
}

.loading-content p {
    color: #94a3b8;
    font-size: 0.9rem;
    line-height: 1.5;
    margin-top: 0.5rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}