:root {
   
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-card: #ffffff;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --border-color: #000000;
    --shadow: rgba(0, 0, 0, 0.1);
    --accent: #4a90e2;
    --accent-hover: #357abd;
    --danger: #e74c3c;
    --danger-hover: #c0392b;
    --success: #27ae60;
    --warning: #f39c12;
    --highlight: #fff3cd;
}

[data-theme="dark"] {
   
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-card: #2d2d2d;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --border-color: #ffffff;
    --shadow: rgba(0, 0, 0, 0.3);
    --accent: #5ba3f5;
    --accent-hover: #4a90e2;
    --danger: #e74c3c;
    --danger-hover: #c0392b;
    --success: #2ecc71;
    --warning: #f39c12;
    --highlight: #4a3d1f;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-primary);
     min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    width: 50%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

header h1 {
    font-size: 2rem;
    color: var(--accent);
}

header h1 i {
    margin-right: 0.5rem;
}

.header-controls {
    display: flex;
    gap: 1rem;
}

.theme-toggle,
.download-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.theme-toggle:hover,
.download-btn:hover {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.search-container {
    position: relative;
    margin-bottom: 1.5rem;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

#searchInput {
    width: 100%;
    padding: 1rem 3rem 1rem 3rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

#searchInput:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.clear-search {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.clear-search:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.sort-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sort-controls label {
    color: var(--text-secondary);
    font-weight: 500;
}

.sort-controls select {
    padding: 0.5rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.sort-controls select:focus {
    outline: none;
    border-color: var(--accent);
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

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

.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.note-card {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    position: relative;
    display: flex;
    flex-direction: column;
    box-shadow: 0 2px 8px var(--shadow);
}

.note-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow);
    border-color: var(--accent);
}

.note-card.pinned {
    border-color: var(--warning);
    border-width: 3px;
}

.note-card.pinned::before {
    content: "📌";
    position: absolute;
    top: -10px;
    right: 10px;
    font-size: 1.5rem;
    background: var(--bg-card);
    padding: 0 0.5rem;
}

.note-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.note-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    word-break: break-word;
}

.note-actions {
    display: flex;
    gap: 0.5rem;
}

.note-action-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

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

.note-action-btn.pin-btn:hover {
    color: var(--warning);
}

.note-action-btn.edit-btn:hover {
    color: var(--accent);
}

.note-action-btn.delete-btn:hover {
    color: var(--danger);
}

.note-content {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
    word-break: break-word;
    flex-grow: 1;
}

.note-content h1,
.note-content h2,
.note-content h3 {
    color: var(--text-primary);
    margin-top: 1rem;
    margin-bottom: 0.5rem;
}

.note-content h1 { font-size: 1.5rem; }
.note-content h2 { font-size: 1.3rem; }
.note-content h3 { font-size: 1.1rem; }

.note-content strong {
    font-weight: 600;
    color: var(--text-primary);
}

.note-content em {
    font-style: italic;
}

.note-content code {
    background: var(--bg-secondary);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.note-content pre {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1rem 0;
}

.note-content pre code {
    background: none;
    padding: 0;
}

.highlight {
    background-color: var(--highlight);
    padding: 0.1rem 0.2rem;
    border-radius: 3px;
    font-weight: 600;
}

.note-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.note-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    background: var(--accent);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.tag.mood-tag {
    background: var(--success);
}

.note-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-left: auto;
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state p {
    font-size: 1.1rem;
}


.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    border-radius: 16px;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

.modal-header h2 {
    color: var(--text-primary);
}

.close-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.close-btn:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.markdown-hint {
    display: block;
    margin-top: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.ai-generated {
    margin-top: 1.5rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 2px solid var(--accent);
}

.ai-section label {
    display: block;
    margin-bottom: 0.75rem;
    color: var(--accent);
    font-weight: 600;
}

.ai-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.summary {
    margin-top: 1rem;
}

.summary strong {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.summary p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    padding: 1.5rem;
    border-top: 2px solid var(--border-color);
}

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

    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

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

    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    .sort-controls {
        width: 100%;
    }

    .sort-controls select {
        flex: 1;
    }

    .modal-content {
        width: 95%;
        margin: 1rem;
    }
}