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

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #edf5ff;
    --bg-hover: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent: #0f4ba5;
    --accent-hover: #1177bb;
    --accent-success: #4ec9b0;
    --accent-danger: #c75450;
    --accent-warning: #f39c12;
    --border: #e2e8f0;
    --input-bg: #3c3c3c;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-success));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

main {
    display: grid;
    gap: 2rem;
}

.key-viewer {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.viewer-container {
    display: grid;
    grid-template-columns: 450px 1fr;
    gap: 2rem;
}

@media (max-width: 1024px) {
    .viewer-container {
        grid-template-columns: 1fr;
    }
}

.input-section {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.key-textarea {
    width: 100%;
    min-height: 280px;
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--input-bg);
    color: var(--text-primary);
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.85rem;
    resize: vertical;
    outline: none;
}

.key-textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(0, 122, 204, 0.2);
}

.key-textarea::placeholder {
    color: var(--text-secondary);
}

.input-actions {
    display: flex;
    gap: 8px;
    margin-top: 8px;
    flex-wrap: wrap;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 6px;
    border: 1px solid var(--border);
}

.info-label {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.info-value {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.85rem;
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background-color: var(--bg-hover);
    border-color: var(--accent);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.output-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.key-display {
    background: var(--bg-secondary);
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 2rem;
    min-height: 400px;
    transition: border-color 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.key-display.has-key {
    border-style: solid;
    border-color: var(--accent);
    background: var(--bg-primary);
}

.text-placeholder {
    text-align: center;
    color: var(--text-secondary);
}

.placeholder-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.key-details {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.detail-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
}

.detail-section h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.detail-content {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    white-space: pre-wrap;
    word-break: break-all;
    color: var(--text-primary);
}

.format-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
}

.format-section h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.format-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    margin-bottom: 1rem;
}

.format-btn {
    padding: 12px;
    border: 1px solid var(--border);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.875rem;
}

.format-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.format-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

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

footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 12px 20px;
    border-radius: 8px;
    color: white;
    font-weight: 500;
    z-index: 10000;
    transform: translateY(-100px);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    max-width: 300px;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    header h1 {
        font-size: 1.75rem;
    }

    .viewer-container {
        grid-template-columns: 1fr;
    }

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

    .format-options {
        grid-template-columns: 1fr;
    }

    .export-actions,
    .input-actions {
        flex-direction: column;
    }
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border);
}