/* Admin Panel Tabs Responsive (All Tabs) */
@media (max-width: 1100px) {
    .files-grid {
        grid-template-columns: 1fr 1fr;
    }
}
@media (max-width: 900px) {
    .admin-nav {
        flex-direction: column;
        gap: 8px;
        align-items: stretch;
    }
    .admin-nav button {
        width: 100%;
        text-align: left;
        border-radius: 6px 6px 0 0;
        font-size: 15px;
        padding: 12px 10px;
    }
    .tab {
        padding: 0;
    }
    .card {
        padding: 15px;
    }
    .files-grid {
        grid-template-columns: 1fr;
    }
    table {
        font-size: 13px;
    }
    th, td {
        padding: 10px 6px;
    }
    .form-row, .form-group {
        flex-direction: column !important;
        gap: 10px;
    }
    .card {
        margin-bottom: 12px;
    }
}

/* Desktop: two cards side by side */
.vip-management-grid, .packages-management-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    align-items: start;
}
@media (max-width: 900px) {
    .vip-management-grid, .packages-management-grid {
        display: flex !important;
        flex-direction: column !important;
        gap: 15px !important;
    }
    .vip-management-grid .card, .packages-management-grid .card {
        width: 100% !important;
        min-width: 0 !important;
        box-sizing: border-box;
    }
}
@media (max-width: 600px) {
    .container {
        padding: 5px;
    }
    main {
        padding: 8px 2px;
    }
    .admin-nav button {
        font-size: 14px;
        padding: 10px 6px;
    }
    .card {
        padding: 8px;
    }
    table, thead, tbody, th, td, tr {
        display: block;
        width: 100%;
    }
    thead {
        display: none;
    }
    tr {
        margin-bottom: 15px;
        border-bottom: 2px solid var(--border-color);
        background: var(--light-bg);
        border-radius: 8px;
        box-shadow: 0 2px 8px rgba(0,0,0,0.04);
        padding: 8px 0;
    }
    td {
        padding: 8px 6px;
        text-align: left;
        position: relative;
    }
    td:before {
        content: attr(data-label);
        font-weight: bold;
        color: var(--text-light);
        display: block;
        margin-bottom: 2px;
        font-size: 12px;
    }
    .files-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    .vip-management-grid, .packages-management-grid {
        gap: 8px !important;
    }
    .vip-management-grid .card, .packages-management-grid .card {
        padding: 8px !important;
    }
}
/* Profile Grid Responsive */
.profile-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}
@media (max-width: 900px) {
    .profile-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    main[style*="max-width:900px"] {
        padding: 10px 0 !important;
    }
}
/* Modern CSS Styling */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --secondary-color: #ec4899;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --dark-bg: #111827;
    --light-bg: #f9fafb;
    --border-color: #e5e7eb;
    --text-dark: #1f2937;
    --text-light: #6b7280;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text-dark);
    line-height: 1.6;
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header/Navigation */
header {
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 30px;
    border-radius: 10px;
    overflow: hidden;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    flex-wrap: wrap;
    gap: 20px;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 8px 15px;
    border-radius: 5px;
}

.nav-links a:hover {
    background: var(--light-bg);
    color: var(--primary-color);
}

.nav-links .btn-logout {
    background: var(--error-color);
    color: white;
}

.nav-links .btn-logout:hover {
    background: #dc2626;
}

.nav-links .btn-admin {
    background: var(--secondary-color);
    color: white;
}

.nav-links .btn-admin:hover {
    background: #be185d;
}

/* Main Content */
main {
    background: white;
    border-radius: 10px;
    padding: 40px 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

h1 {
    font-size: 32px;
    margin-bottom: 10px;
    color: var(--text-dark);
}

h2 {
    font-size: 24px;
    margin-top: 30px;
    margin-bottom: 20px;
    color: var(--text-dark);
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-color);
}

.welcome-msg {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 30px;
    padding: 15px;
    background: var(--light-bg);
    border-radius: 5px;
    border-left: 4px solid var(--primary-color);
}

/* Forms */
form {
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 500px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

label {
    font-weight: 500;
    color: var(--text-dark);
}

input[type="text"],
input[type="password"],
input[type="email"],
textarea {
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    transition: all 0.3s ease;
    font-family: inherit;
}

input[type="text"]:focus,
input[type="password"]:focus,
input[type="email"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Buttons */
button,
.btn {
    padding: 12px 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

button:hover,
.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

button:active,
.btn:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--text-light);
}

.btn-secondary:hover {
    background: var(--text-dark);
}

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

.btn-danger:hover {
    background: #dc2626;
}

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

.btn-success:hover {
    background: #059669;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 14px;
}

/* Messages */
.alert {
    padding: 15px 20px;
    border-radius: 6px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border-left: 4px solid var(--error-color);
}

.alert-success {
    background: #dcfce7;
    color: #166534;
    border-left: 4px solid var(--success-color);
}

.alert-warning {
    background: #fef3c7;
    color: #92400e;
    border-left: 4px solid var(--warning-color);
}

.alert-info {
    background: #dbeafe;
    color: #0c2d6b;
    border-left: 4px solid var(--primary-color);
}

/* Card Layout */
.card {
    background: var(--light-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 15px;
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.card-header {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-body {
    color: var(--text-light);
    font-size: 14px;
}

.card-footer {
    margin-top: 15px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

/* Files Grid */
.files-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.file-card {
    background: var(--light-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    transition: all 0.3s ease;
}

.file-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.file-name {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
    word-break: break-word;
}

.file-meta {
    font-size: 12px;
    color: var(--text-light);
    margin-bottom: 15px;
}

.file-actions {
    display: flex;
    gap: 8px;
}

.file-actions .btn {
    flex: 1;
    padding: 8px 12px;
    font-size: 14px;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
}

.empty-state-icon {
    font-size: 60px;
    margin-bottom: 20px;
}

.empty-state-text {
    color: var(--text-light);
    margin-bottom: 20px;
}

/* Footer */
footer {
    text-align: center;
    color: white;
    padding: 20px;
    font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    nav {
        padding: 15px 20px;
    }

    h1 {
        font-size: 24px;
    }

    h2 {
        font-size: 20px;
    }

    main {
        padding: 20px 15px;
    }

    .files-grid {
        grid-template-columns: 1fr;
    }

    form {
        max-width: 100%;
    }

    .nav-links {
        flex-direction: column;
        width: 100%;
    }

    .nav-links a {
        width: 100%;
        text-align: center;
    }
}

/* Animation */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

main {
    animation: slideIn 0.3s ease;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}

.text-muted {
    color: var(--text-light);
}

.divider {
    height: 1px;
    background: var(--border-color);
    margin: 20px 0;
}