:root {
    --primary-color: #4285f4;
    --secondary-color: #34a853;
    --accent-color: #ea4335;
    --dark-color: #003366;
    --light-color: #f8f9fa;
    --text-color: #333;
    --text-light: #666;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f7fa;
    color: var(--text-color);
    line-height: 1.6;
}

nav {
    background-color: var(--dark-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.nav-links {
    display: flex;
    flex: 1;
    justify-content: flex-end;
}

.nav-links #loginLink,
.nav-links #logoutLink {
    margin-left: auto;
}

nav a {
    display: flex;
    align-items: center;
    color: white;
    text-align: center;
    padding: 18px 20px;
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
}

nav a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

nav a.active {
    background-color: var(--primary-color);
    font-weight: 500;
}

nav a.active:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 3px;
    background-color: white;
}

nav a i {
    margin-right: 8px;
    font-size: 0.9em;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 10px;
}

.header {
    text-align: center;
    padding: 40px 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    margin-bottom: 30px;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 700px;
    margin: 0 auto;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.upload-container {
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    padding: 30px;
    margin-bottom: 40px;
}

.upload-area {
    border: 2px dashed #ccc;
    border-radius: 10px;
    padding: 40px;
    text-align: center;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.upload-area:hover, .upload-area.dragover {
    border-color: var(--primary-color);
    background-color: rgba(66, 133, 244, 0.05);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.upload-area h3 {
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.upload-area p {
    margin: 10px 0;
    color: var(--text-light);
}

.btn {
    background-color: var(--primary-color);
    color: white;
    padding: 12px 25px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s ease;
    margin: 5px;
}

.btn:hover {
    background-color: #3367d6;
    transform: translateY(-2px);
}

.btn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    transform: none;
}

.google-btn {
    background-color: white;
    color: var(--text-color);
    border: 1px solid #ddd;
    padding: 12px 25px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin: 20px auto;
}

.google-btn:hover {
    background-color: #f8f9fa;
    transform: translateY(-2px);
}

.file-list {
    margin: 20px 0;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    border-bottom: 1px solid #eee;
}


.file-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.file-icon {
    color: var(--primary-color);
}

.file-name {
    font-weight: 500;
}

.file-size {
    color: var(--text-light);
    font-size: 0.9rem;
}

.remove-btn {
    color: var(--accent-color);
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
}

.success-message {
    color: var(--secondary-color);
    background-color: rgba(52, 168, 83, 0.1);
    padding: 15px;
    border-radius: 5px;
    margin: 15px 0;
    display: none;
}

.error-message {
    color: var(--accent-color);
    background-color: rgba(234, 67, 53, 0.1);
    padding: 15px;
    border-radius: 5px;
    margin: 15px 0;
    display: none;
}

.instructions {
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    padding: 25px;
    margin-bottom: 40px;
}

.instructions h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.instructions ul {
    padding-left: 20px;
}

.instructions li {
    margin-bottom: 8px;
}

/* Folder Prompt Styles */
.folder-prompt {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.folder-prompt .prompt-content {
    background-color: white;
    padding: 25px;
    border-radius: 8px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.folder-prompt h3 {
    margin-bottom: 20px;
    color: var(--text-color);
    font-size: 1.2rem;
}

.input-container {
    margin-bottom: 20px;
}

.folder-input {
    width: 100%;
    padding: 10px 0;
    border: none;
    border-bottom: 1px solid #ddd;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.folder-input:focus {
    outline: none;
    border-bottom-color: var(--primary-color);
}

.invalid-input {
    border-bottom-color: #d32f2f !important;
}

.error-prompt {
    display: none;
    align-items: center;
    color: #d32f2f;
    font-size: 0.85rem;
    margin-top: 8px;
    padding: 5px 0;
}

.error-prompt i {
    margin-right: 8px;
    font-size: 0.9rem;
}

.prompt-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.btn-cancel {
    background-color: #f5f5f5;
    color: var(--text-color);
}

.btn-cancel:hover {
    background-color: #e0e0e0;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
}

.modal-content {
    position: relative;
    background-color: white;
    margin: 10% auto;
    padding: 20px;
    width: 90%;
    max-width: 500px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

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

.close {
    color: #aaa;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: black;
}

.btn-create {
    background-color: var(--primary-color);
    font-size: 0.9rem;
    padding: 8px 15px;
}

.btn-create:hover {
    background-color: #3367d6;
}

.new-folder-input {
    display: none;
    margin: 10px 0;
    padding: 10px;
    border-radius: 5px;
    border: 2px solid var(--primary-color);
    width: 100%;
}

.folder-list {
    max-height: 300px;
    overflow-y: auto;
    margin: 15px 0;
}

.folder-item {
    display: flex;
    align-items: center;
    padding: 10px;
    cursor: pointer;
    border-radius: 5px;
    transition: background-color 0.2s;
}

.folder-item:hover {
    background-color: #f0f0f0;
}

.folder-item.selected {
    background-color: #e3f2fd;
}

.folder-item i {
    color: var(--primary-color);
    margin-right: 10px;
}

.folder-nav {
    color: var(--primary-color);
    padding: 5px;
    transition: transform 0.2s;
    cursor: pointer;
}

.folder-nav:hover {
    transform: translateX(3px);
    color: var(--dark-color);
}

.folder-name {
    flex-grow: 1;
    margin-right: 10px;
}

.modal-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 15px;
}

.btn-cancel {
    background-color: #f0f0f0;
    color: var(--text-color);
}

.btn-cancel:hover {
    opacity: 0.9;
}

/* Upload Prompt Styles */
.upload-prompt {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    min-width: 300px;
    max-width: 400px;
    padding: 0;
    animation: slideIn 0.3s ease;
}

.upload-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 15px;
    border-bottom: 1px solid #eee;
    background: var(--primary-color);
    color: white;
    border-radius: 8px 8px 0 0;
}

.upload-title {
    font-weight: 500;
    font-size: 1rem;
}

.upload-buttons {
    display: flex;
    gap: 10px;
}

.upload-button {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.upload-button:hover {
    background: rgba(255, 255, 255, 0.2);
}

.upload-content {
    padding: 15px;
    max-height: 300px;
    overflow-y: auto;
}

.upload-file-progress {
    display: flex;
    align-items: center;
    margin: 5px 0;
    padding: 5px;
    border-radius: 4px;
    background: #f5f5f5;
}

.upload-file-progress i {
    margin-right: 8px;
    color: var(--primary-color);
}

.upload-file-name {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.upload-file-percent {
    margin-left: 8px;
    min-width: 45px;
    text-align: right;
}

.upload-prompt.minimized {
    min-width: 200px;
    height: auto;
}

.upload-prompt.minimized .upload-content {
    display: none;
}

.upload-prompt.minimized .upload-header {
    border-radius: 8px;
    border-bottom: none;
}

.upload-prompt.minimized .minimize-btn i {
    transform: rotate(-180deg);
}

@media (max-width: 768px) {
    .upload-prompt {
        bottom: 10px;
        right: 10px;
        left: 10px;
        min-width: unset;
        max-width: unset;
        width: auto;
    }
}

/* Responsive Styles */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    
    .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        justify-content: flex-start;
    }

    .nav-links #loginLink,
    .nav-links #logoutLink {
        margin-left: 0;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    nav a {
        padding: 12px;
        justify-content: center;
    }
    
    .nav-container {
        flex-direction: column;
        padding: 0px;
    }

    .header h1 {
        font-size: 2rem;
    }

    .upload-area {
        padding: 20px;
    }

    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }

    .file-item {
        align-items: flex-start;
        gap: 10px;
    }

    .remove-btn {
        align-self: flex-end;
    }

    /* Folder navigation adjustments */
    .folder-nav {
        padding: 3px;
    }

    /* Modal adjustments for mobile */
    .modal-content {
        margin: 20% auto;
        width: 95%;
        padding: 15px;
    }
    
    .folder-prompt .prompt-content {
        width: 95%;
        padding: 15px;
    }
    
    .modal-buttons {
        flex-direction: column;
    }
    
    .modal-buttons button {
        width: 100%;
        margin: 5px 0;
    }
    
    .folder-prompt .prompt-buttons {
        flex-direction: column;
    }
    
    .folder-prompt .prompt-buttons button {
        width: 100%;
        margin: 5px 0;
    }
    
    .modal-header h2 {
        font-size: 1.3rem;
    }
    
    .folder-list {
        max-height: 200px;
    }
    
    .folder-item {
        padding: 8px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 30px 15px;
    }
    
    .header h1 {
        font-size: 1.8rem;
    }
    
    .header p {
        font-size: 1rem;
    }
    
    .upload-container {
        padding: 15px;
    }

    /* Further mobile adjustments */
    .modal-content {
        margin: 30% auto;
    }
    
    .modal-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .close {
        margin-top: 10px;
        align-self: flex-end;
    }
    
    .folder-prompt h3 {
        font-size: 1.2rem;
    }
    
    .folder-prompt .folder-input {
        padding: 8px;
        font-size: 0.9rem;
    }
    
    .btn {
        width: 100%;
        margin: 5px 0;
    }
}