:root {
    --primary: #2c3e50;
    --secondary: #3498db;
    --success: #27ae60;
    --danger: #e74c3c;
    --warning: #f39c12;
    --light: #ecf0f1;
    --dark: #2c3e50;
    --gray: #95a5a6;
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --text-color: #333333;
    --border-color: #ddd;
    --shadow: rgba(0, 0, 0, 0.1);
}

.dark-mode {
    --primary: #3498db;
    --secondary: #2980b9;
    --success: #2ecc71;
    --danger: #e74c3c;
    --warning: #f39c12;
    --light: #34495e;
    --dark: #ecf0f1;
    --gray: #7f8c8d;
    --bg-color: #1a1a2e;
    --card-bg: #16213e;
    --text-color: #e6e6e6;
    --border-color: #2c3e50;
    --shadow: rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    transition: background-color 0.3s, color 0.3s;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
}

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

/* Running Text */
.running-text-container {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: white;
    padding: 12px 0;
    margin-bottom: 25px;
    border-radius: 8px;
    overflow: hidden;
    position: relative;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.running-text-content {
    display: flex;
    animation: runningText 30s linear infinite;
    white-space: nowrap;
}

@keyframes runningText {
    0% { transform: translateX(100%); }
    100% { transform: translateX(-100%); }
}

.running-text-item {
    padding: 0 40px;
    font-weight: 600;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.running-text-item i {
    font-size: 1.2rem;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

h1 {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 5px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    width: 60px;
    height: 60px;
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.tagline {
    font-size: 1.1rem;
    color: var(--gray);
    max-width: 600px;
}

.theme-toggle {
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 50px;
    padding: 10px 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    color: var(--text-color);
    box-shadow: 0 3px 10px var(--shadow);
}

.theme-toggle:hover {
    transform: translateY(-2px);
}

.theme-toggle i {
    font-size: 1.2rem;
}

/* Cloud Status */
.cloud-status {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 15px;
    background-color: var(--card-bg);
    border-radius: 20px;
    font-size: 0.9rem;
    margin-top: 10px;
    border: 1px solid var(--border-color);
}

.cloud-status.connected {
    color: var(--success);
}

.cloud-status.disconnected {
    color: var(--danger);
}

.info-box {
    background-color: var(--card-bg);
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 30px;
    box-shadow: 0 8px 20px var(--shadow);
    border-left: 5px solid var(--secondary);
}

.info-box h3 {
    color: var(--secondary);
    margin-bottom: 15px;
    font-size: 1.4rem;
}

.info-box p {
    margin-bottom: 10px;
}

.tabs-container {
    background-color: var(--card-bg);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 8px 20px var(--shadow);
    margin-bottom: 30px;
}

.tabs {
    display: flex;
    background-color: var(--light);
    padding: 5px;
}

.tab {
    flex: 1;
    padding: 18px 20px;
    text-align: center;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    border-radius: 10px;
    margin: 0 5px;
    color: var(--dark);
    border: none;
    background-color: transparent;
}

.tab:hover {
    background-color: rgba(52, 152, 219, 0.1);
}

.tab.active {
    background-color: var(--card-bg);
    color: var(--secondary);
    box-shadow: 0 4px 10px var(--shadow);
}

.content-area {
    padding: 30px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

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

.form-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

@media (max-width: 992px) {
    .form-container {
        grid-template-columns: 1fr;
    }
}

.input-group {
    margin-bottom: 25px;
}

.input-group.full-width {
    grid-column: 1 / -1;
}

label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--text-color);
    font-size: 1rem;
}

/* Key Strength Indicator */
.key-strength-container {
    margin-top: 10px;
}

.key-strength-indicator {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-top: 8px;
}

.strength-bar {
    flex: 1;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.strength-level {
    height: 100%;
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 4px;
}

.strength-level.weak { background-color: var(--danger); width: 33%; }
.strength-level.medium { background-color: var(--warning); width: 66%; }
.strength-level.strong { background-color: var(--success); width: 100%; }

.strength-text {
    font-size: 0.9rem;
    font-weight: 600;
    min-width: 80px;
}

select, input[type="password"], input[type="text"] {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background-color: var(--card-bg);
    color: var(--text-color);
}

select:focus, input[type="password"]:focus, input[type="text"]:focus {
    border-color: var(--secondary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

textarea {
    width: 100%;
    height: 180px;
    padding: 18px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    resize: vertical;
    transition: all 0.3s ease;
    background-color: var(--card-bg);
    color: var(--text-color);
}

textarea:focus {
    border-color: var(--secondary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

.file-input-container {
    border: 2px dashed var(--border-color);
    border-radius: 10px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: var(--light);
}

.file-input-container:hover {
    border-color: var(--secondary);
    background-color: rgba(52, 152, 219, 0.05);
}

.file-input-container i {
    font-size: 3rem;
    color: var(--secondary);
    margin-bottom: 20px;
}

.file-input-container p {
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.file-name {
    font-size: 0.95rem;
    color: var(--gray);
    margin-top: 15px;
    padding: 10px;
    background-color: var(--card-bg);
    border-radius: 8px;
    word-break: break-all;
}

input[type="file"] {
    display: none;
}

/* Key Generator */
.key-generator {
    background-color: var(--light);
    border-radius: 10px;
    padding: 20px;
    margin-top: 15px;
    border: 1px solid var(--border-color);
}

.key-generator label {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

#key-length {
    flex: 1;
}

#generated-key {
    background-color: var(--card-bg);
    padding: 15px;
    border-radius: 8px;
    margin-top: 15px;
    word-break: break-all;
    font-family: monospace;
    border: 1px dashed var(--border-color);
}

/* Batch Mode */
.batch-mode {
    border: 2px dashed var(--border-color);
    border-radius: 10px;
    padding: 20px;
    margin-top: 15px;
    text-align: center;
}

.file-list {
    margin-top: 15px;
    max-height: 200px;
    overflow-y: auto;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    background-color: var(--light);
    margin-bottom: 5px;
    border-radius: 8px;
}

.button-group {
    display: flex;
    gap: 15px;
    margin-top: 25px;
}

button {
    padding: 16px 30px;
    border: none;
    border-radius: 10px;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex: 1;
}

button:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px var(--shadow);
}

button:active {
    transform: translateY(-1px);
}

.encrypt-btn {
    background-color: var(--secondary);
    color: white;
}

.encrypt-btn:hover {
    background-color: var(--primary);
}

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

.decrypt-btn:hover {
    background-color: #219653;
}

.clear-btn {
    background-color: var(--gray);
    color: white;
}

.clear-btn:hover {
    background-color: #7f8c8d;
}

.detection-info {
    background-color: rgba(52, 152, 219, 0.1);
    border-radius: 10px;
    padding: 15px;
    margin-top: 10px;
    border-left: 4px solid var(--secondary);
}

.detection-info i {
    color: var(--secondary);
    margin-right: 10px;
}

/* Progress Container */
.progress-container {
    margin-top: 20px;
    display: none;
}

.progress-container.active {
    display: block;
}

.progress-bar {
    height: 10px;
    background-color: var(--border-color);
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--secondary), var(--primary));
    border-radius: 5px;
    transition: width 0.3s ease;
}

.progress-text {
    text-align: center;
    font-size: 0.9rem;
    color: var(--gray);
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background-color: var(--card-bg);
    color: var(--text-color);
    padding: 15px 20px;
    border-radius: 10px;
    box-shadow: 0 5px 15px var(--shadow);
    display: flex;
    align-items: center;
    gap: 15px;
    min-width: 300px;
    animation: slideInRight 0.3s ease;
    border-left: 4px solid var(--secondary);
}

.toast.success {
    border-left-color: var(--success);
}

.toast.error {
    border-left-color: var(--danger);
}

.toast.warning {
    border-left-color: var(--warning);
}

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

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

/* Confirmation Dialog */
.confirmation-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

.confirmation-overlay.active {
    opacity: 1;
    visibility: visible;
}

.confirmation-dialog {
    background-color: var(--card-bg);
    border-radius: 15px;
    padding: 30px;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.confirmation-dialog p {
    margin-bottom: 25px;
    font-size: 1.1rem;
    text-align: center;
}

.dialog-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
}

.btn-cancel, .btn-confirm {
    padding: 12px 25px;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-cancel {
    background-color: var(--gray);
    color: white;
}

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

.btn-cancel:hover, .btn-confirm:hover {
    transform: translateY(-2px);
}

/* Help/Guide Overlay */
.guide-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

.guide-overlay.active {
    opacity: 1;
    visibility: visible;
}

.guide-content {
    background-color: var(--card-bg);
    border-radius: 15px;
    padding: 30px;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
}

.guide-step {
    margin-bottom: 30px;
}

.guide-step:last-child {
    margin-bottom: 0;
}

.guide-step h5 {
    color: var(--secondary);
    margin-bottom: 10px;
    font-size: 1.2rem;
}

/* Modal/Popup Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background-color: var(--card-bg);
    border-radius: 20px;
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    transform: translateY(30px);
    transition: transform 0.4s;
}

.modal-overlay.active .modal {
    transform: translateY(0);
}

.modal-header {
    padding: 25px 30px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    color: var(--primary);
    font-size: 1.8rem;
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.8rem;
    color: var(--gray);
    cursor: pointer;
    padding: 5px;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-modal:hover {
    background-color: rgba(231, 76, 60, 0.1);
    color: var(--danger);
}

.modal-content {
    padding: 30px;
}

.result-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.summary-item {
    background-color: var(--light);
    border-radius: 10px;
    padding: 20px;
    text-align: center;
}

.summary-item i {
    font-size: 2rem;
    color: var(--secondary);
    margin-bottom: 10px;
}

.summary-label {
    font-size: 0.9rem;
    color: var(--gray);
    margin-bottom: 5px;
}

.summary-value {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-color);
}

.encrypted-preview {
    background-color: var(--light);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 30px;
}

.encrypted-preview h3 {
    margin-bottom: 15px;
    color: var(--secondary);
}

.preview-text {
    max-height: 200px;
    overflow-y: auto;
    padding: 15px;
    background-color: var(--card-bg);
    border-radius: 8px;
    font-family: monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    word-break: break-all;
}

.modal-actions {
    display: flex;
    gap: 15px;
    justify-content: flex-end;
}

.modal-btn {
    padding: 12px 25px;
    border-radius: 8px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 0 0 auto;
}

.copy-btn {
    background-color: var(--primary);
    color: white;
}

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

.close-btn {
    background-color: var(--gray);
    color: white;
}

.save-cloud-btn {
    background-color: var(--secondary);
    color: white;
}

/* Cloud Storage Tab */
.cloud-storage-tab {
    background-color: var(--card-bg);
    border-radius: 15px;
    padding: 30px;
    margin-top: 30px;
}

.cloud-actions {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
}

.storage-items {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    max-height: 400px;
    overflow-y: auto;
    padding: 20px;
    background-color: var(--light);
    border-radius: 10px;
}

.storage-item {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.storage-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.storage-item-name {
    font-weight: 600;
    color: var(--text-color);
}

.storage-item-meta {
    font-size: 0.85rem;
    color: var(--gray);
    margin-top: 10px;
}

/* Credits */
.credits {
    text-align: center;
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

.credit-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.credit-link {
    color: var(--secondary);
    text-decoration: none;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    border-radius: 10px;
    background-color: var(--light);
    transition: all 0.3s ease;
}

.credit-link:hover {
    background-color: var(--secondary);
    color: white;
    transform: translateY(-3px);
}

footer {
    text-align: center;
    padding: 30px;
    color: var(--gray);
    font-size: 0.95rem;
    margin-top: 30px;
    border-top: 1px solid var(--border-color);
}

.footer-info {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
}

.method-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
    justify-content: center;
}

.badge {
    background-color: var(--light);
    color: var(--text-color);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    width: 80px;
    height: 80px;
    border: 5px solid var(--border-color);
    border-top-color: var(--secondary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-text {
    margin-top: 20px;
    color: white;
    font-size: 1.2rem;
    font-weight: 600;
    text-align: center;
}

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

@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
    }
    
    .tabs {
        flex-direction: column;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .form-container {
        grid-template-columns: 1fr;
    }
    
    .modal-actions {
        flex-direction: column;
    }
    
    .result-summary {
        grid-template-columns: 1fr;
    }
    
    .credit-links {
        flex-direction: column;
        align-items: center;
    }
    
    .running-text-item {
        padding: 0 20px;
        font-size: 0.9rem;
    }
}