* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Avenir Next", "Segoe UI", Arial, sans-serif;
    background: linear-gradient(160deg, #f6f8f7 0%, #eef2f0 100%);
    color: #121414;
}

.papers-page {
    max-width: 980px;
    margin: 0 auto;
    padding: 2.5rem 1.25rem 3rem;
}

.papers-header {
    margin-bottom: 1.5rem;
}

.papers-header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

.papers-header-actions {
    display: flex;
    align-items: center;
    gap: 0.7rem;
}

.papers-back-link {
    color: #0b5a4f;
    text-decoration: none;
    font-size: 0.82rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.papers-back-link:hover {
    text-decoration: underline;
}

h1 {
    margin: 0;
    font-size: clamp(1.9rem, 4vw, 2.8rem);
    letter-spacing: 0.02em;
}

.papers-subtitle {
    margin: 0.6rem 0 0;
    color: #42504c;
    max-width: 620px;
}

.papers-workspace {
    background: #ffffff;
    border: 1px solid #dce5e1;
    box-shadow: 0 20px 45px rgba(36, 55, 50, 0.08);
    padding: 1.2rem;
}

.papers-controls {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.paper-input-row,
.paper-filter-row {
    display: flex;
    gap: 0.55rem;
}

.papers-controls input,
.papers-controls select,
.paper-notes-input {
    width: 100%;
    border: 1px solid #ced9d4;
    padding: 0.65rem 0.72rem;
    background: #ffffff;
    color: #121414;
    font-size: 0.88rem;
}

.papers-controls input:focus,
.papers-controls select:focus,
.paper-notes-input:focus,
.paper-notes-editor:focus {
    outline: none;
    border-color: #0b7f6e;
    box-shadow: 0 0 0 2px rgba(11, 127, 110, 0.15);
}

.papers-controls select {
    width: 130px;
    flex: none;
}

.paper-btn {
    border: 1px solid #ced9d4;
    background: #ffffff;
    color: #121414;
    cursor: pointer;
    padding: 0.65rem 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-size: 0.72rem;
    white-space: nowrap;
}

.paper-btn-primary {
    background: #0b7f6e;
    border-color: #0b7f6e;
    color: #ffffff;
}

.papers-theme-btn {
    border: 1px solid #ced9d4;
    background: #ffffff;
    color: #15211f;
    cursor: pointer;
    padding: 0.5rem 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-size: 0.66rem;
}

.paper-btn[disabled] {
    opacity: 0.65;
    cursor: wait;
}

.paper-add-status {
    margin: 0;
    min-height: 1rem;
    color: #5a6a66;
    font-size: 0.78rem;
}

.papers-summary {
    margin-top: 0.95rem;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.6rem;
}

.papers-summary-item {
    border: 1px solid #e2eae7;
    background: #f8fbfa;
    padding: 0.6rem 0.7rem;
}

.papers-summary-label {
    display: block;
    color: #5a6a66;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.07em;
}

.papers-summary-value {
    display: block;
    margin-top: 0.18rem;
    font-size: 1.35rem;
    font-weight: 600;
}

.papers-list {
    margin-top: 0.95rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.papers-empty {
    border: 1px dashed #ced9d4;
    color: #5a6a66;
    padding: 0.95rem;
}

.paper-card {
    border: 1px solid #dce5e1;
    background: #ffffff;
    padding: 0.85rem;
    display: flex;
    flex-direction: column;
    gap: 0.68rem;
}

.paper-card-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.6rem;
}

.paper-title-link {
    color: #172220;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
    word-break: break-word;
}

.paper-title-link:hover {
    text-decoration: underline;
}

.paper-status {
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #6a7a76;
}

.paper-meta {
    font-size: 0.75rem;
    color: #5a6a66;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.paper-doi-link {
    color: #0b5a4f;
    text-decoration: none;
}

.paper-doi-link:hover {
    text-decoration: underline;
}

.paper-notes-input {
    min-height: 90px;
    resize: vertical;
    line-height: 1.35;
}

.paper-notes-section {
    border: 1px solid #dce5e1;
    background: #fcfdfd;
}

.paper-notes-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
    padding: 0.45rem 0.55rem;
    border-bottom: 1px solid #e6ecea;
    background: #f8fbfa;
}

.paper-notes-title {
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #4b5d59;
}

.paper-notes-preview {
    padding: 0.65rem 0.7rem;
    font-size: 0.82rem;
    color: #4f605c;
}

.paper-notes-section.collapsed .paper-notes-toolbar,
.paper-notes-section.collapsed .paper-notes-editor,
.paper-notes-section.collapsed .paper-notes-meta {
    display: none;
}

.paper-notes-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    padding: 0.45rem;
    border-bottom: 1px solid #e6ecea;
    background: #f6faf8;
}

.paper-tool-btn,
.paper-tool-select {
    border: 1px solid #ced9d4;
    background: #ffffff;
    color: #1c2825;
    font-size: 0.72rem;
    letter-spacing: 0.02em;
    padding: 0.28rem 0.45rem;
}

.paper-tool-btn {
    cursor: pointer;
    min-width: 2rem;
}

.paper-tool-select {
    min-height: 1.9rem;
}

.paper-notes-editor {
    min-height: 130px;
    padding: 0.72rem;
    outline: none;
    line-height: 1.45;
    font-size: 0.9rem;
}

.paper-notes-editor:empty::before {
    content: attr(data-placeholder);
    color: #7f8c88;
}

.paper-notes-editor h2,
.paper-notes-editor h3,
.paper-notes-editor h4 {
    margin: 0.35rem 0;
}

.paper-notes-editor p {
    margin: 0.35rem 0;
}

.paper-notes-editor ul,
.paper-notes-editor ol {
    margin: 0.35rem 0;
    padding-left: 1.4rem;
}

.paper-notes-editor blockquote {
    margin: 0.4rem 0;
    border-left: 3px solid #89b8af;
    padding-left: 0.6rem;
    color: #3f514c;
}

.paper-notes-meta {
    border-top: 1px solid #e6ecea;
    background: #f9fbfa;
    padding: 0.35rem 0.55rem;
    font-size: 0.72rem;
    color: #5d6b67;
}

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

.paper-action-btn {
    border: 1px solid #ced9d4;
    background: #ffffff;
    color: #172220;
    cursor: pointer;
    padding: 0.35rem 0.62rem;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

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

.paper-action-btn.primary {
    background: #0b7f6e;
    border-color: #0b7f6e;
    color: #ffffff;
}

.paper-action-btn.danger {
    border-color: #c14545;
    color: #c14545;
}

@media (max-width: 760px) {
    .paper-input-row,
    .paper-filter-row {
        flex-direction: column;
    }

    .papers-controls select {
        width: 100%;
    }

    .papers-summary {
        grid-template-columns: 1fr;
    }

    .papers-header-top {
        flex-direction: column;
        align-items: flex-start;
    }

    .papers-header-actions {
        width: 100%;
        justify-content: space-between;
    }
}

body.dark-mode {
    background: linear-gradient(160deg, #141a19 0%, #101513 100%);
    color: #e6eeeb;
}

body.dark-mode .papers-back-link {
    color: #67c7b5;
}

body.dark-mode .papers-subtitle {
    color: #9eb2ac;
}

body.dark-mode .papers-workspace {
    background: #1a2220;
    border-color: #2a3632;
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.35);
}

body.dark-mode .papers-controls input,
body.dark-mode .papers-controls select,
body.dark-mode .paper-tool-select,
body.dark-mode .paper-tool-btn,
body.dark-mode .paper-btn,
body.dark-mode .papers-theme-btn,
body.dark-mode .paper-action-btn {
    background: #121917;
    border-color: #30403b;
    color: #dce7e3;
}

body.dark-mode .paper-btn-primary {
    background: #2d8f7f;
    border-color: #2d8f7f;
    color: #0c1311;
}

body.dark-mode .paper-add-status,
body.dark-mode .papers-summary-label,
body.dark-mode .paper-meta,
body.dark-mode .paper-status,
body.dark-mode .paper-notes-title,
body.dark-mode .paper-notes-preview,
body.dark-mode .paper-notes-meta {
    color: #9fb2ac;
}

body.dark-mode .papers-summary-item {
    background: #121917;
    border-color: #2c3935;
}

body.dark-mode .paper-card,
body.dark-mode .paper-notes-section {
    background: #1a2220;
    border-color: #2a3632;
}

body.dark-mode .paper-notes-header,
body.dark-mode .paper-notes-toolbar,
body.dark-mode .paper-notes-meta {
    background: #161e1c;
    border-color: #2d3a36;
}

body.dark-mode .paper-title-link,
body.dark-mode h1 {
    color: #ecf3f1;
}

body.dark-mode .paper-doi-link {
    color: #67c7b5;
}

body.dark-mode .paper-notes-editor:empty::before {
    color: #7f928c;
}

body.dark-mode .paper-notes-editor blockquote {
    color: #a6bbb5;
    border-left-color: #4a897e;
}