/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
    min-height: 100vh;
    padding: 20px;
}

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

/* Header Styles */
header {
    text-align: center;
    margin-bottom: 40px;
    padding-top: 20px;
}

header h1 {
    color: #2c3e50;
    font-size: 2.5rem;
    margin-bottom: 10px;
}

header p {
    color: #7f8c8d;
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
}

/* Card Styles */
.card {
    background-color: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    padding: 30px;
    margin-bottom: 30px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #2c3e50;
}

input, select, button {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid #e0e6ed;
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s ease;
}

input:focus, select:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

button {
    background-color: #3498db;
    color: white;
    border: none;
    cursor: pointer;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-top: 10px;
}

button:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.3);
}

button.delete-btn {
    background-color: #e74c3c;
    margin-top: 0;
}

button.delete-btn:hover {
    background-color: #c0392b;
    box-shadow: 0 5px 15px rgba(231, 76, 60, 0.3);
}

button.secondary-btn {
    background-color: #2c3e50;
}

button.secondary-btn:hover {
    background-color: #1a252f;
    box-shadow: 0 5px 15px rgba(44, 62, 80, 0.3);
}

button.success-btn {
    background-color: #27ae60;
}

button.success-btn:hover {
    background-color: #219653;
    box-shadow: 0 5px 15px rgba(39, 174, 96, 0.3);
}

/* File List Styles */
.file-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.file-item {
    background-color: white;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    border-left: 5px solid #3498db;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.file-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.file-item.apk {
    border-left-color: #9b59b6;
}

.file-item.zip {
    border-left-color: #e74c3c;
}

.file-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
}

.file-name {
    font-weight: 700;
    font-size: 1.2rem;
    color: #2c3e50;
    margin-bottom: 5px;
}

.file-type {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    background-color: #ecf0f1;
    color: #7f8c8d;
}

.file-actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

/* Login Screen */
.login-container {
    max-width: 400px;
    margin: 80px auto;
}

.login-card {
    text-align: center;
}

.login-card h2 {
    margin-bottom: 30px;
    color: #2c3e50;
}

.password-input {
    position: relative;
}

.password-toggle {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #7f8c8d;
    cursor: pointer;
    width: auto;
    padding: 0;
}

/* Admin Panel */
.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 15px;
}

.admin-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

/* Drag & Drop Area */
.drop-area {
    border: 3px dashed #bdc3c7;
    border-radius: 10px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 25px;
    background-color: #f8f9fa;
}

.drop-area:hover, .drop-area.dragover {
    border-color: #3498db;
    background-color: #e8f4fc;
}

.drop-area i {
    font-size: 3rem;
    color: #3498db;
    margin-bottom: 15px;
}

.drop-area p {
    color: #7f8c8d;
    font-size: 1.1rem;
}

.drop-area .browse-link {
    color: #3498db;
    text-decoration: underline;
    cursor: pointer;
}

/* Public Page Styles */
.filter-buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.filter-btn {
    width: auto;
    padding: 10px 20px;
}

.filter-btn.active {
    background-color: #3498db;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 50px 20px;
    color: #7f8c8d;
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 20px;
    color: #bdc3c7;
}

/* Notification */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 25px;
    border-radius: 8px;
    color: white;
    font-weight: 600;
    z-index: 1000;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transform: translateX(150%);
    transition: transform 0.5s ease;
}

.notification.show {
    transform: translateX(0);
}

.notification.success {
    background-color: #27ae60;
}

.notification.error {
    background-color: #e74c3c;
}

.notification.info {
    background-color: #3498db;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 50px;
    padding-top: 20px;
    border-top: 1px solid #e0e6ed;
    color: #7f8c8d;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .card {
        padding: 20px;
    }
    
    .file-list {
        grid-template-columns: 1fr;
    }
    
    .admin-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .admin-actions {
        width: 100%;
        justify-content: flex-start;
    }
    
    .filter-buttons {
        justify-content: flex-start;
    }
}

/* Icons */
.icon {
    display: inline-block;
    margin-right: 8px;
}

/* Link to Admin */
.admin-link {
    display: inline-block;
    margin-top: 30px;
    color: #3498db;
    text-decoration: none;
    font-weight: 600;
    padding: 10px 20px;
    border-radius: 8px;
    background-color: rgba(52, 152, 219, 0.1);
    transition: all 0.3s ease;
}

.admin-link:hover {
    background-color: rgba(52, 152, 219, 0.2);
    transform: translateY(-2px);
}