@import url('https://fonts.googleapis.com/css2?family=Fira+Code&display=swap');

:root {
    --primary-color-hsl: 220, 85%, 55%;
    --primary-color: hsl(var(--primary-color-hsl));
    --primary-hover: hsl(220, 85%, 50%);
    --primary-focus-shadow: hsla(var(--primary-color-hsl), 0.25);

    --bg-color: hsl(210, 40%, 98%);
    --surface-color: #fff;
    --text-color: hsl(214, 20%, 25%);
    --text-muted-color: hsl(214, 15%, 55%);
    --border-color: hsl(210, 30%, 88%);
    --shadow-color: hsla(220, 40%, 15%, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.main-content {
    max-width: 1000px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    color: var(--text-color);
    margin-top: 0;
    margin-bottom: 3rem;
    border-bottom: none;
    padding-bottom: 0;
}

h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 1rem;
    padding-bottom: 0;
    border-bottom: none;
}

label {
    display: block;
    margin-bottom: 0.75rem;
    font-weight: 500;
    color: var(--text-muted-color);
    font-size: 0.9rem;
}

textarea {
    width: 100%;
    min-height: 40vh;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--surface-color);
    color: var(--text-color);
    font-family: 'Fira Code', 'JetBrains Mono', monospace;
    font-size: 1rem;
    line-height: 1.5;
    margin-bottom: 1.5rem;
    resize: vertical;
    box-shadow: 0 1px 2px var(--shadow-color);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

textarea:focus,
textarea:focus-visible {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px var(--primary-focus-shadow), 0 1px 2px var(--shadow-color);
}

.button-group {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    align-items: center;
}

button {
    padding: 0.65rem 1.25rem;
    border: 1px solid transparent;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1.2;
    transition: all 0.2s ease-in-out;
    user-select: none;
}

button:focus-visible {
    outline: none;
    box-shadow: 0 0 0 4px var(--primary-focus-shadow);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.button-primary {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.button-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.button-secondary {
    background-color: var(--surface-color);
    color: var(--text-color);
    border-color: var(--border-color);
}

.button-secondary:hover:not(:disabled) {
    border-color: hsl(210, 30%, 80%);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px var(--shadow-color);
}

.info {
    font-size: 0.9rem;
    color: var(--text-muted-color);
    margin-top: 1.5rem;
    padding: 1.5rem 2rem;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
}

.info p:first-of-type {
    margin-top: 0;
}

.info strong {
    color: var(--text-color);
    font-weight: 600;
}

.info ul {
    margin: 1rem 0 0;
    padding-left: 1.25rem;
}

.info li {
    margin: 0.5rem 0;
    padding-left: 0.5rem;
}

.info li::marker {
    color: var(--primary-color);
    font-weight: bold;
}

.input-section {
    margin-bottom: 2rem;
    padding-bottom: 0;
    border-bottom: none;
}

.workspace-panel {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    height: fit-content;
    box-shadow: 0 2px 4px var(--shadow-color);
    margin-top: 3rem;
}

.workspace-panel h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0 0 1rem 0;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.section-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem;
    margin: 0.25rem 0;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    background-color: var(--surface-color);
    position: relative;
}

.section-item:hover {
    background-color: var(--bg-color);
    border-color: var(--border-color);
}

.section-item.active {
    background-color: var(--primary-color);
    color: white;
}

.section-title {
    flex: 1;
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-right: 0.5rem;
}

.section-actions {
    display: flex;
    gap: 0.25rem;
    opacity: 1;
    transition: opacity 0.2s ease;
}

.section-item:hover .section-actions {
    opacity: 1;
}

.section-item.active .section-actions {
    opacity: 1;
}

.action-btn {
    width: 24px;
    height: 24px;
    padding: 0;
    border: 1px solid var(--border-color);
    background: var(--surface-color);
    color: var(--text-color);
    cursor: pointer;
    border-radius: 3px;
    font-size: 0.75rem;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.action-btn:hover {
    background-color: var(--bg-color);
    border-color: var(--primary-color);
}

.section-item:not(.active) .action-btn {
    color: var(--text-muted-color);
    border-color: var(--border-color);
}

.section-item:not(.active) .action-btn:hover {
    background-color: var(--bg-color);
    color: var(--text-color);
    border-color: var(--primary-color);
}

.save-controls {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    align-items: stretch;
}

.save-title-input {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--surface-color);
    color: var(--text-color);
    font-size: 0.9rem;
}

.save-title-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px var(--primary-focus-shadow);
}

.save-btn {
    padding: 0.5rem 0.75rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background-color 0.2s ease;
}

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

.save-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.empty-state {
    text-align: center;
    color: var(--text-muted-color);
    font-size: 0.9rem;
    padding: 1rem;
    font-style: italic;
}

.history-item {
    display: flex;
    align-items: center;
    padding: 0.5rem;
    margin: 0.25rem 0;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    background-color: var(--surface-color);
}

.history-item:hover {
    background-color: var(--bg-color);
    border-color: var(--border-color);
}

.history-title {
    flex: 1;
    font-size: 0.85rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-right: 0.5rem;
}

.history-date {
    font-size: 0.75rem;
    color: var(--text-muted-color);
}

.history-actions {
    display: flex;
    gap: 0.25rem;
    margin-left: 0.5rem;
    opacity: 1;
    transition: opacity 0.2s ease;
}

.history-item:hover .history-actions {
    opacity: 1;
}

.import-section {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.import-button {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--bg-color);
    border: 2px dashed var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-muted-color);
    transition: all 0.2s ease;
}

.import-button:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background-color: var(--surface-color);
}

/* Library Action Buttons */
.library-actions {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.library-action-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
}

.library-action-btn .btn-icon {
    font-size: 1rem;
}

/* Breadcrumb Navigation */
.library-breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    padding: 0.5rem 0.75rem;
    margin-bottom: 0.75rem;
    background-color: var(--bg-color);
    border-radius: 6px;
    font-size: 0.85rem;
}

.breadcrumb-link {
    background: none;
    border: none;
    padding: 0.25rem 0.5rem;
    color: var(--primary-color);
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.85rem;
    transition: background-color 0.2s ease;
}

.breadcrumb-link:hover {
    background-color: var(--surface-color);
    text-decoration: underline;
}

.breadcrumb-separator {
    color: var(--text-muted-color);
    margin: 0 0.125rem;
}

.breadcrumb-current {
    color: var(--text-color);
    font-weight: 500;
    padding: 0.25rem 0.5rem;
}

/* Folder Items */
.folder-item {
    background-color: var(--bg-color);
}

.folder-item:hover {
    background-color: var(--surface-color);
}

.folder-icon {
    font-size: 1.1rem;
    margin-right: 0.5rem;
    flex-shrink: 0;
}

.folder-title {
    color: var(--text-color);
    font-weight: 500;
}

/* Color Indicator */
.color-indicator {
    width: 6px;
    height: 100%;
    min-height: 24px;
    border-radius: 3px 0 0 3px;
    margin-right: 0.5rem;
    flex-shrink: 0;
}

/* Color Picker */
.color-picker {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.color-picker-btn {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    color: var(--text-muted-color);
    padding: 0;
}

.color-picker-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 2px 4px var(--shadow-color);
}

.color-picker-btn.selected {
    border-color: var(--text-color);
    box-shadow: 0 0 0 2px var(--primary-focus-shadow);
}

/* Color button in actions */
.color-btn {
    font-size: 0.6rem;
}

/* Mobile responsive styles for library actions */
@media (max-width: 480px) {
    .library-actions {
        flex-wrap: wrap;
    }
    
    .library-action-btn {
        flex: 1 1 calc(50% - 0.25rem);
        min-width: 0;
        font-size: 0.75rem;
        padding: 0.4rem 0.5rem;
    }
    
    .library-action-btn .btn-icon {
        font-size: 0.85rem;
    }
}