@import url('https://fonts.googleapis.com/css2?family=Playfair+Display+SC:wght@400;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Libre+Baskerville:wght@400;700&display=swap');

:root {
    /* Base colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --text-primary: #333333;
    --text-secondary: #666666;
    --accent-primary: #1e90ff;
    --accent-secondary: #87cefa;
    --border-color: #dddddd;
    --link-color: #1e90ff;
    --link-hover: #87cefa;
}

[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #bbbbbb;
    --accent-primary: #1e90ff;
    --accent-secondary: #87cefa;
    --border-color: #444444;
    --link-color: #1e90ff;
    --link-hover: #87cefa;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

html {
    font-family: "Libre Baskerville", serif;
    font-size: 16px;
    line-height: 1.5;
}

@media (min-width: 38em) {
    html {
        font-size: 20px;
    }
}

body {
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
    font-family: "Libre Baskerville", serif;
}

.container {
    max-width: 38rem;
    padding-left: 1rem;
    padding-right: 1rem;
    margin-left: auto;
    margin-right: auto;
}

@media (min-width: 38em) {
    .container {
        max-width: 32rem;
    }
}

@media (min-width: 56em) {
    .container {
        max-width: 38rem;
    }
}

a {
    color: var(--link-color);
    text-decoration: none;
}

a:hover, a:focus {
    color: var(--link-hover);
    text-decoration: underline;
}

.masthead {
    margin-bottom: 2rem;
    text-align: center;
    padding-top: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-primary);
}

.masthead-title {
    margin-top: 0;
    margin-bottom: 0;
    color: var(--accent-primary);
    line-height: 1.2;
    font-family: "Playfair Display SC", serif;
    font-size: 2rem;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.masthead-title a {
    color: var(--accent-primary);
}

.masthead-subtitle {
    font-family: "Playfair Display SC", serif;
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-top: 0.5rem;
    font-style: italic;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

@media (max-width: 48em) {
    .masthead {
        padding: 1rem 0;
    }
    
    .masthead-title {
        font-size: 1.8rem;
    }
    
    .masthead-subtitle {
        font-size: 0.9rem;
        padding: 0 1rem;
    }
}

.footer {
    text-align: center;
    padding: 0.8rem 0;
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
    margin-top: 2rem;
}

.footer .container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.footer a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.3s ease-in-out;
    font-weight: 500;
}

.footer a:hover {
    color: var(--accent-secondary);
    text-decoration: underline;
}

.footer p {
    margin: 0;
    line-height: 1.2;
}

.katex { font-size: 1.15em; }

.reference-list {
    max-width: 80vw;
    margin: 0 auto;
    padding: 20px;
}

.reference-item {
    margin-bottom: 0.5em;
    display: flex;
    align-items: flex-start;
    gap: 0.5em;
    flex-wrap: wrap;
    position: relative;
    padding-left: 1.5em;
}

.reference-item::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--text-primary);
}

.reference-more {
    justify-content: center;
    text-align: center;
    color: rgb(255, 100, 100);
    font-style: italic;
    background: none;
    box-shadow: none;
    padding: 1em 0 0.5em 0;
}
.reference-more::before {
    content: "";
    display: none;
}

.reference-text {
    margin-bottom: 0;
}

.reference-preview {
    font-size: 0.85em;
    font-style: italic;
    color: var(--text-secondary);
    margin-left: 1em;
    flex-basis: 100%;
    margin-top: 0.2em;
}

.reference-buttons {
    display: flex;
    gap: 0.5em;
    flex-wrap: wrap;
    margin-left: auto;
}

.reference-button {
    padding: 0;
    border: none;
    background: none;
    color: var(--link-color);
    cursor: pointer;
    font-size: 1em;
    transition: color 0.2s ease;
    text-decoration: none;
}

.reference-button:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

.reference-button.copied {
    color: var(--accent-secondary);
}

button {
    background-color: var(--bg-secondary);
    color: var(--link-color);
    border: none;
    padding: 6px 12px;
    margin: 0 4px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

button:hover {
    background-color: var(--accent-primary);
    color: var(--text-primary);
}

.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background-color: #333;;
    color: white;
    padding: 12px 24px;
    border-radius: 4px;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}
.toast.show {
    opacity: 1;
}

.keyword-panel {
    max-width: 80vw;
    margin: 0 auto 1.5rem;
    padding: 0.8rem;
    padding-bottom: 3rem;
    background-color: var(--bg-secondary);
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: relative;
}

.keyword-category {
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.keyword-category h3 {
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    min-width: 80px;
}

.keyword-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
    margin-bottom: 0.3rem;
    flex: 1;
}

.keyword-btn {
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.2s ease;
}

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

.keyword-btn.active {
    background-color: var(--accent-primary);
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

.clear-filter-btn {
    position: absolute;
    bottom: 0.5rem;
    right: 0.5rem;
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
    height: 36px;
    box-sizing: border-box;
}

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

/* Hide filtered sections */
.reference-section-hidden {
    display: none;
}

.search-container {
    position: absolute;
    bottom: 0.5rem;
    left: 0.5rem;
    right: 6rem;
    padding: 0;
    margin: 0;
}

.search-input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    font-size: 14px;
    height: 36px;
    box-sizing: border-box;
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.search-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 2px solid var(--accent-primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
    z-index: 100;
    font-size: 20px;
    padding: 0;
}

.theme-toggle:hover {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
}

.theme-toggle.dark {
    color: var(--text-primary);
}

.theme-toggle.dark:hover {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
}

.add-ref-btn {
    position: fixed;
    top: 20px;
    right: 70px;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 2px solid var(--accent-primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
    z-index: 100;
    font-size: 20px;
    padding: 0;
}

.add-ref-btn:hover {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
}

/* Modal styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    overflow-y: auto;
    padding: 20px;
}

.modal-content {
    background-color: var(--bg-primary);
    padding: 20px;
    width: 80%;
    max-width: 800px;
    border-radius: 5px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    font-size: 14px;
    margin: auto;
    max-height: 90vh;
    overflow-y: auto;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-primary);
}

.form-group textarea,
.form-group input {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

.form-group textarea {
    height: 200px;
    resize: vertical;
}

.button-group {
    margin-top: 20px;
    text-align: right;
}

.button-group button {
    margin-left: 10px;
}

.drop-zone {
    border: 2px dashed var(--border-color);
    padding: 20px;
    text-align: center;
    margin-bottom: 15px;
    border-radius: 4px;
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
}

.drop-zone.dragover {
    background-color: var(--accent-secondary);
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.reference-description {
    font-size: 0.9em;
    color: var(--text-secondary);
    margin-top: 0.5em;
    font-style: italic;
}

.button {
    background-color: var(--bg-secondary);
    color: var(--link-color);
    border: none;
    padding: 6px 12px;
    margin: 0 4px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.button:hover {
    background-color: var(--accent-primary);
    color: var(--text-primary);
}

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

.button.primary:hover {
    background-color: var(--accent-secondary);
    color: white;
}

.button.danger {
    background-color: #ff4444;
    color: white;
}

.button.danger:hover {
    background-color: #cc0000;
}

.key-validation {
    font-size: 0.75rem;
    font-weight: normal;
    display: inline;
}

.key-validation.valid {
    color: #28a745;
}

.key-validation.invalid {
    color: #dc3545;
}

.key-validation.conflict {
    color: #ff8c00;
}

/* Edit button styles */
button[onclick^="editReference"] {
    background-color: #ffe681;
    color: var(--text-primary);
    border: none;
    padding: 6px 12px;
    margin: 0 4px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

[data-theme="dark"] button[onclick^="editReference"] {
    background-color: var(--bg-secondary);
    color: #ffd700;
}

[data-theme="dark"] button[onclick^="editReference"]:hover {
    background-color: var(--bg-secondary);
    color: #ffed4a;
}