:root {
    --background-color: #111111;
    --container-background: #1a1a1a;
    --text-color: #e2e8f0;
    --subtitle-color: #94a3b8;
    --disclaimer-color: #666666;
    --border-color: #555555;
    --input-background: #222222;
    --placeholder-color: #888888;
    --focus-border-color: #ffffff;
    --button-primary-bg: #ffffff;
    --button-primary-text: #111111;
    --button-secondary-bg: #333333;
    --button-secondary-text: white;
    --button-tertiary-bg: #666666;
    --button-tertiary-text: white;
    --copy-btn-bg: linear-gradient(135deg, #28a745, #20a040);
    --copy-btn-hover-bg: linear-gradient(135deg, #218838, #1e7e34);
    --copy-btn-copied-bg: #28a745;
    --link-color: #666666;
    --extra-methods-desc-color: #94a3b8;
    --error-color: #c53030;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--background-color);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-color);
    position: relative;
    overflow-x: hidden;
}

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

.notification {
    background-color: var(--button-secondary-bg);
    color: var(--button-secondary-text);
    padding: 15px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    opacity: 0;
    transform: translateX(100%);
    transition: all 0.5s cubic-bezier(0.68, -0.55, 0.27, 1.55);
}

.notification.show {
    opacity: 1;
    transform: translateX(0);
}

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

.container {
    max-width: none;
    width: 100%;
    margin: 0;
    background: none;
    border: none;
    border-radius: 0;
    padding: 40px 60px;
    box-shadow: none;
    backdrop-filter: none;
    position: relative;
}

.container::before {
    display: none;
}

h1 {
    text-align: center;
    color: var(--focus-border-color);
    margin-bottom: 10px;
    font-size: 3em;
    font-weight: 700;
}

.subtitle {
    text-align: center;
    color: var(--subtitle-color);
    margin-bottom: 40px;
    font-style: italic;
    font-size: 1.1em;
    opacity: 0.8;
}

.disclaimer {
    text-align: center;
    color: var(--disclaimer-color);
    margin-bottom: 30px;
    font-style: italic;
    font-size: 0.9em;
    opacity: 0.7;
    font-weight: 400;
    line-height: 1.3;
}

.input-section {
    margin-bottom: 15px;
}

.output-section {
    margin-bottom: 30px;
}

label {
    display: block;
    margin-bottom: 12px;
    font-weight: 600;
    color: #f1f5f9;
    font-size: 1.1em;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

textarea {
    width: 100%;
    min-height: 140px;
    padding: 20px;
    border: 2px solid var(--border-color);
    border-radius: 16px;
    font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
    font-size: 14px;
    resize: vertical;
    transition: all 0.3s ease;
    background: var(--input-background);
    color: var(--text-color);
}

textarea::placeholder {
    color: var(--placeholder-color);
    opacity: 0.7;
}

textarea:focus {
    outline: none;
    border-color: var(--focus-border-color);
    box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.1);
    background: var(--input-background);
}

.encryption-methods {
    margin: 25px 0;
}

.methods-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

.methods-label {
    font-size: 1.05em;
    color: #f1f5f9;
    font-weight: 600;
}

.methods-buttons {
    display: flex;
    gap: 8px;
}

.select-all-btn, .clear-all-btn {
    padding: 4px 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 11px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: auto;
    background: var(--button-secondary-bg);
    color: var(--text-color);
}

.select-all-btn:hover {
    background: #444444;
    border-color: #666666;
}

.clear-all-btn:hover {
    background: #555555;
    border-color: #777777;
}

.checkbox-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 15px 25px;
    margin-top: 10px;
}

.checkbox-item {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-weight: normal;
    font-size: 0.9em;
    margin-bottom: 0;
}

.checkbox-item input[type="checkbox"] {
    margin: 0 6px 0 0;
    cursor: pointer;
    accent-color: var(--focus-border-color);
}

.checkbox-item span {
    color: var(--text-color);
    user-select: none;
}

.extra-methods-toggle {
    margin-top: 15px;
}

.toggle-extra-methods-btn {
    color: var(--link-color);
    font-size: 0.85em;
    text-decoration: none;
    opacity: 0.6;
    transition: opacity 0.3s ease;
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    min-width: auto;
}

.toggle-extra-methods-btn:hover {
    opacity: 0.8;
    transform: none;
    box-shadow: none;
}

.extra-methods-section {
    margin-top: 15px;
    display: none;
}

.extra-methods-description {
    color: var(--extra-methods-desc-color);
    font-size: 0.85em;
    margin-bottom: 8px;
    font-style: italic;
}

.button-group {
    display: flex;
    gap: 20px;
    margin: 30px 0;
    justify-content: flex-start;
    flex-wrap: wrap;
}

button {
    padding: 16px 32px;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: inherit;
    position: relative;
    overflow: hidden;
    min-width: 160px;
}

button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

button:hover::before {
    left: 100%;
}

.encrypt-btn {
    background: var(--button-primary-bg);
    color: var(--button-primary-text);
    box-shadow: 0 8px 25px rgba(255, 255, 255, 0.2);
}

.decrypt-btn {
    background: var(--button-secondary-bg);
    color: var(--button-secondary-text);
    box-shadow: 0 8px 25px rgba(51, 51, 51, 0.3);
}

.clear-btn {
    background: var(--button-tertiary-bg);
    color: var(--button-tertiary-text);
    box-shadow: 0 8px 25px rgba(102, 102, 102, 0.3);
}

button:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.3);
}

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

.output-buttons {
    display: flex;
    gap: 15px;
    margin-top: 15px;
    align-items: center;
}

.toggle-steps-btn {
    background: #444444;
    color: white;
    border: none;
    padding: 10px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(68, 68, 68, 0.3);
    visibility: hidden;
    opacity: 0;
    min-width: auto;
}

.toggle-steps-btn:hover {
    background: #555555;
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(68, 68, 68, 0.4);
}

.toggle-steps-btn.show {
    visibility: visible;
    opacity: 1;
    animation: fadeIn 0.4s ease-out forwards;
}

.steps-content-collapsed {
    display: none;
}

.steps-content-expanded {
    display: block;
    text-align: left;
    background: var(--input-background);
    border-radius: 16px;
    padding: 25px;
    margin-top: 20px;
    border: 1px solid var(--border-color);
    animation: fadeInSteps 0.3s ease-out forwards;
}

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

.step {
    margin-bottom: 18px;
    padding: 16px;
    background: var(--button-secondary-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.step:hover {
    border-color: #777777;
    background: #444444;
}

.step-title {
    font-weight: 600;
    color: var(--focus-border-color);
    margin-bottom: 8px;
    font-size: 1.05em;
}

.step-content {
    font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
    font-size: 13px;
    color: #cccccc;
    word-break: break-all;
    background: var(--input-background);
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.step-content strong {
    color: var(--text-color);
}

.copy-btn {
    background: var(--copy-btn-bg);
    color: white;
    border: none;
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(40, 167, 69, 0.3);
    position: relative;
    overflow: hidden;
    width: auto;
    min-width: auto;
    visibility: hidden;
    opacity: 0;
}

.copy-btn.copied {
    background: var(--copy-btn-copied-bg);
}

.copy-btn.show {
    visibility: visible;
    opacity: 1;
    animation: fadeIn 0.4s ease-out forwards;
}

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

.copy-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

.copy-btn:hover::before {
    left: 100%;
}

.copy-btn:hover {
    background: var(--copy-btn-hover-bg);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(40, 167, 69, 0.4);
}

@keyframes glow {
    0%, 100% { 
        box-shadow: 0 0 10px rgba(255, 255, 255, 0.3), 
                   0 0 20px rgba(255, 255, 255, 0.2); 
    }
    50% { 
        box-shadow: 0 0 20px rgba(255, 255, 255, 0.6), 
                   0 0 40px rgba(255, 255, 255, 0.4); 
    }
}

.processing {
    animation: glow 1.5s ease-in-out infinite;
}

/* Scrollbar styling for dark theme */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--button-secondary-bg);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--disclaimer-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #777777;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 25px 20px;
    }
    
    h1 {
        font-size: 2.2em;
    }
    
    .button-group {
        flex-direction: column;
        align-items: center;
    }
    
    button {
        width: 100%;
        max-width: 280px;
    }
}