/* ===== VitePress-like tokens (minimal) ===== */
:root {
    color-scheme: light;
    --vp-c-white: #ffffff;
    --vp-c-black: #000000;

    --vp-c-bg: #ffffff;
    --vp-c-bg-alt: #f6f6f7;
    --vp-c-bg-elv: #ffffff;
    --vp-c-bg-soft: #f6f6f7;

    --vp-c-border: #c2c2c4;
    --vp-c-divider: #e2e2e3;

    --vp-c-text-1: #1b1b1f;
    --vp-c-text-2: #3c3f44;
    --vp-c-text-3: #6a6a71;

    /* Brand (matches your VitePress site) */
    --vp-c-brand-1: #2563eb;
    --vp-c-brand-2: #1d4ed8;
    --vp-c-brand-3: #1e40af;

    --vp-shadow-1: 0 1px 2px rgba(0, 0, 0, .04), 0 1px 2px rgba(0, 0, 0, .06);
    --vp-shadow-3: 0 12px 32px rgba(0, 0, 0, .1), 0 2px 6px rgba(0, 0, 0, .08);

    --vp-font-family-base: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    --vp-font-family-mono: ui-monospace, "Menlo", "Monaco", "Consolas", "Liberation Mono", "Courier New", monospace;

    --vp-nav-height: 64px;
}

html.dark {
    color-scheme: dark;
    --vp-c-bg: #1b1b1f;
    --vp-c-bg-alt: #161618;
    --vp-c-bg-elv: #202127;
    --vp-c-bg-soft: #202127;

    --vp-c-border: #3c3f44;
    --vp-c-divider: #2e2e32;

    --vp-c-text-1: #dfdfd6;
    --vp-c-text-2: #98989f;
    --vp-c-text-3: #6a6a71;
}

/* Back-compat vars used by existing components */
:root {
    --bg-color: var(--vp-c-bg);
    --bg-alt: var(--vp-c-bg-alt);
    --card-bg: var(--vp-c-bg-elv);
    --text-primary: var(--vp-c-text-1);
    --text-secondary: var(--vp-c-text-2);
    --accent-color: var(--vp-c-brand-1);
    --border-color: var(--vp-c-border);
    --divider-color: var(--vp-c-divider);
}

body {
    font-family: var(--vp-font-family-base);
    line-height: 1.6;
    max-width: 100%; /* Full width */
    margin: 0;
    padding: calc(var(--vp-nav-height) + 24px) clamp(16px, 4vw, 64px) 24px;
    background-color: var(--bg-color);
    color: var(--text-primary);
    box-sizing: border-box;
}

main {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
}

/* Wide-screen two-column grid for paper cards */
@media (min-width: 1100px) {
    #paper-list,
    .paper-list {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    /* Loading / empty state should span full width */
    #paper-list > .loading {
        grid-column: 1 / -1;
    }
}

.results-header {
    margin-top: 40px;
    border-bottom: 1px solid var(--divider-color);
    padding-bottom: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* ===== VPNav (minimal clone) ===== */
.VPNav {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 30;
    width: 100%;
    pointer-events: none;
}

.VPNavBar {
    position: relative;
    height: var(--vp-nav-height);
    background-color: var(--vp-c-bg);
    transition: background-color .25s;
    pointer-events: none;
}

.VPNavBar .wrapper {
    padding: 0 8px 0 24px;
}

@media (min-width: 768px) {
    .VPNavBar .wrapper {
        padding: 0 32px;
    }
}

.VPNavBar .container {
    display: flex;
    justify-content: space-between;
    margin: 0 auto;
    max-width: 1376px;
    height: var(--vp-nav-height);
    pointer-events: none;
}

.VPNavBar .container * {
    pointer-events: auto;
}

.VPNavBarTitle {
    display: flex;
    align-items: center;
    height: var(--vp-nav-height);
    flex-shrink: 0;
}

.title-link {
    display: flex;
    align-items: center;
    height: var(--vp-nav-height);
    font-size: 16px;
    font-weight: 600;
    color: var(--vp-c-text-1);
    text-decoration: none;
    transition: opacity .25s;
}

.title-link:hover {
    opacity: .8;
}

.content {
    flex-grow: 1;
}

.content-body {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 6px;
    height: var(--vp-nav-height);
}

.VPNavBarMenu {
    display: none;
}

@media (min-width: 768px) {
    .VPNavBarMenu {
        display: flex;
    }
}

.VPNavBarMenuLink {
    display: flex;
    align-items: center;
    padding: 0 12px;
    line-height: var(--vp-nav-height);
    font-size: 14px;
    font-weight: 500;
    color: var(--vp-c-text-1);
    text-decoration: none;
    transition: color .25s;
}

.VPNavBarMenuLink:hover,
.VPNavBarMenuLink.active {
    color: var(--vp-c-brand-1);
}

.PTNavControls {
    display: flex;
    align-items: center;
    padding: 0 6px;
}

.PTDateSelect {
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--vp-c-divider);
    font-size: 13px;
    background-color: var(--vp-c-bg-alt);
    color: var(--vp-c-text-1);
    cursor: pointer;
    min-width: 168px;
}

.PTDateSelect:focus {
    outline: none;
    border-color: var(--vp-c-brand-1);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--vp-c-brand-1) 18%, transparent);
}

.VPSwitch {
    position: relative;
    border-radius: 11px;
    display: block;
    width: 40px;
    height: 22px;
    flex-shrink: 0;
    border: 1px solid var(--vp-c-border);
    background-color: color-mix(in srgb, var(--vp-c-divider) 45%, transparent);
    transition: border-color .25s;
}

.VPSwitch:hover {
    border-color: var(--vp-c-brand-1);
}

.VPSwitch .check {
    position: absolute;
    top: 1px;
    left: 1px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background-color: var(--vp-c-bg);
    box-shadow: var(--vp-shadow-1);
    transition: transform .25s;
}

html.dark .VPSwitch .check {
    transform: translateX(18px);
}

.VPSwitch .icon {
    position: relative;
    display: block;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    overflow: hidden;
}

.VPSwitch .vpi-sun,
.VPSwitch .vpi-moon {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 12px;
    height: 12px;
    background-color: currentColor;
}

.VPSwitch .vpi-sun {
    -webkit-mask: radial-gradient(circle at center, transparent 35%, #000 36%) no-repeat;
    mask: radial-gradient(circle at center, transparent 35%, #000 36%) no-repeat;
    opacity: 1;
    color: var(--vp-c-text-2);
}

.VPSwitch .vpi-moon {
    -webkit-mask: radial-gradient(circle at 30% 30%, transparent 45%, #000 46%) no-repeat;
    mask: radial-gradient(circle at 30% 30%, transparent 45%, #000 46%) no-repeat;
    opacity: 0;
    color: var(--vp-c-text-2);
}

html.dark .VPSwitch .vpi-sun {
    opacity: 0;
}

html.dark .VPSwitch .vpi-moon {
    opacity: 1;
}

.VPSocialLink {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 36px;
    height: 36px;
    color: var(--vp-c-text-2);
    transition: color .25s;
}

.VPSocialLink:hover {
    color: var(--vp-c-text-1);
}

.VPNavBarHamburger {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 48px;
    height: var(--vp-nav-height);
    border: 0;
    padding: 0;
    background: transparent;
    color: var(--vp-c-text-1);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.VPNavBarHamburger:focus-visible {
    outline: 2px solid color-mix(in srgb, var(--vp-c-brand-1) 55%, transparent);
    outline-offset: 2px;
    border-radius: 10px;
}

@media (min-width: 768px) {
    .VPNavBarHamburger {
        display: none;
    }
}

.VPNavBarHamburger .container {
    position: relative;
    width: 16px;
    height: 14px;
    overflow: hidden;
}

.VPNavBarHamburger .top,
.VPNavBarHamburger .middle,
.VPNavBarHamburger .bottom {
    position: absolute;
    width: 16px;
    height: 2px;
    background-color: var(--vp-c-text-1);
    transition: top .25s, transform .25s, background-color .25s;
}

.VPNavBarHamburger .top {
    top: 0;
    left: 0;
}

.VPNavBarHamburger .middle {
    top: 6px;
    left: 0;
}

.VPNavBarHamburger .bottom {
    top: 12px;
    left: 0;
}

.VPNavBarHamburger.active .top {
    top: 6px;
    transform: rotate(225deg);
}

.VPNavBarHamburger.active .middle {
    transform: translateX(16px);
}

.VPNavBarHamburger.active .bottom {
    top: 6px;
    transform: rotate(135deg);
}

.divider {
    width: 100%;
    height: 1px;
}

.divider-line {
    width: 100%;
    height: 1px;
    background-color: var(--vp-c-divider);
}

.VPNavScreen {
    position: fixed;
    top: var(--vp-nav-height);
    right: 0;
    bottom: 0;
    left: 0;
    padding: 0 32px;
    width: 100%;
    background-color: var(--vp-c-bg);
    overflow-y: auto;
    pointer-events: auto;
}

@media (min-width: 768px) {
    .VPNavScreen {
        display: none;
    }
}

.VPNavScreen .container {
    margin: 0 auto;
    padding: 24px 0 96px;
    max-width: 288px;
}

.VPNavScreenMenuLink {
    display: block;
    border-bottom: 1px solid var(--vp-c-divider);
    padding: 12px 0 11px;
    line-height: 24px;
    font-size: 14px;
    font-weight: 500;
    color: var(--vp-c-text-1);
    text-decoration: none;
    transition: color .25s;
}

.VPNavScreenMenuLink:hover {
    color: var(--vp-c-brand-1);
}

.VPNavScreenItem {
    margin-top: 16px;
}

.VPNavScreenLabel {
    font-size: 12px;
    font-weight: 600;
    color: var(--vp-c-text-2);
    margin-bottom: 8px;
}

.VPNavScreenThemeButton {
    width: 100%;
    border: 1px solid var(--vp-c-divider);
    border-radius: 10px;
    padding: 10px 12px;
    background-color: var(--vp-c-bg-alt);
    color: var(--vp-c-text-1);
    font-weight: 600;
}

.VPNavScreenThemeButton:hover {
    border-color: var(--vp-c-brand-1);
}

.paper-list {
    margin-top: 16px;
}

.PTTopicsHeader {
    display: flex;
    justify-content: center;
    padding: 12px 0 8px;
}

/* Paper filter bar (index page) */
.PTFilterBar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.PTFilterInput {
    flex: 1;
    min-width: 200px;
    padding: 10px 16px;
    border-radius: 20px;
    border: 1px solid var(--vp-c-divider);
    font-size: .95rem;
    outline: none;
    background-color: var(--vp-c-bg);
    color: var(--vp-c-text-1);
    transition: border-color .2s;
}

.PTFilterInput:focus {
    border-color: var(--vp-c-brand-1);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--vp-c-brand-1) 18%, transparent);
}

.PTFilterStats {
    font-size: .85rem;
    color: var(--vp-c-text-3);
    white-space: nowrap;
}

/* Fav toggle button in filter bar */
.PTFavToggle {
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid var(--vp-c-divider);
    background: var(--vp-c-bg);
    color: var(--vp-c-text-2);
    font-size: .9rem;
    cursor: pointer;
    white-space: nowrap;
    transition: all .2s;
}

.PTFavToggle:hover {
    border-color: var(--vp-c-brand-1);
    color: var(--vp-c-brand-1);
}

.PTFavToggle.active {
    background: var(--vp-c-brand-1);
    color: #fff;
    border-color: var(--vp-c-brand-1);
}

/* Bookmark star on paper card */
.pt-fav-btn {
    background: none;
    border: none;
    font-size: 1.1rem;
    cursor: pointer;
    color: var(--vp-c-divider);
    margin-left: 8px;
    vertical-align: middle;
    transition: color .2s, transform .15s;
    padding: 0 2px;
    line-height: 1;
}

.pt-fav-btn:hover {
    color: #f59e0b;
    transform: scale(1.2);
}

.pt-fav-btn.active {
    color: #f59e0b;
}

/* Cards */
.paper-card {
    background: var(--card-bg);
    margin-bottom: 0; /* grid gap handles spacing */
    padding: 24px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: box-shadow 0.2s ease, transform 0.1s ease;
}

.paper-card:hover {
    box-shadow: var(--vp-shadow-3);
    transform: translateY(-1px);
}

.paper-title {
    margin: 0 0 10px 0;
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.4;
}

.paper-title a {
    text-decoration: none;
    color: var(--text-primary);
    transition: color 0.2s;
}

.paper-title a:hover {
    color: var(--accent-color);
}

.paper-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    border-bottom: 1px solid var(--divider-color);
    padding-bottom: 12px;
}

.meta-item {
    display: inline-flex;
    align-items: center;
}

.meta-sep {
    color: #d0d7de;
}

.pdf-link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    padding: 2px 6px;
    border: 1px solid color-mix(in srgb, var(--vp-c-brand-1) 25%, transparent);
    border-radius: 4px;
    font-size: 0.8rem;
    margin-left: 4px;
    transition: background-color 0.2s;
}

.pdf-link:hover {
    background-color: rgba(9, 105, 218, 0.05);
}

/* AI Summary Box */
.daily-summary {
    background-color: var(--bg-alt);
    border-left: 3px solid var(--accent-color);
    padding: 12px;
    border-radius: 0 6px 6px 0;
    margin-bottom: 12px;
    font-size: 0.95rem;
    color: var(--text-primary);
    white-space: pre-line; /* Preserve newlines */
    line-height: 1.6;
}

.summary-label {
    font-weight: 700;
    color: var(--accent-color);
    display: block;
    margin-bottom: 6px;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Abstract & Details */
details {
    margin-top: 6px;
}

summary {
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    user-select: none;
    display: block;
    padding: 4px 0;
    transition: color 0.2s;
}

summary:hover {
    color: var(--accent-color);
}

/* Custom marker animation */
summary::-webkit-details-marker {
    display: none;
}
summary::before {
    content: '▶';
    display: inline-block;
    margin-right: 8px;
    font-size: 0.7em;
    transition: transform 0.2s ease;
    color: #8c959f;
}
details[open] summary::before {
    transform: rotate(90deg);
}

/* Important fix: Remove max-height limit on abstract */
.paper-abstract {
    margin-top: 4px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    white-space: pre-line; /* Handle newlines from text */
    padding: 16px;
    background-color: var(--bg-alt);
    border-radius: 6px;
}

/* Loading & Footer */
.loading {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
    font-size: 1rem;
}

footer {
    text-align: center;
    margin-top: 60px;
    padding: 24px;
    color: var(--text-secondary);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
}

/* Tag Styles */
.paper-tags {
    margin-top: 12px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag-badge {
    display: inline-block;
    padding: 4px 8px;
    background-color: color-mix(in srgb, var(--vp-c-brand-1) 10%, var(--vp-c-bg));
    color: var(--vp-c-brand-1);
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
    border: 1px solid color-mix(in srgb, var(--vp-c-brand-1) 25%, transparent);
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
}

.tag-badge:hover {
    background-color: var(--vp-c-brand-1);
    color: var(--vp-c-white);
}

/* Tag Cloud Page */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 20px 0;
    justify-content: center;
}

.tag-pill {
    display: inline-block;
    padding: 8px 16px;
    background-color: var(--vp-c-bg-elv);
    border: 1px solid var(--vp-c-divider);
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--vp-c-text-1);
    cursor: pointer;
    transition: transform 0.1s, box-shadow 0.1s;
}

.tag-pill:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    border-color: var(--vp-c-brand-1);
    color: var(--vp-c-brand-1);
}

#search-input {
    width: min(560px, 60vw);
    padding: 10px 16px;
    border-radius: 20px;
    border: 1px solid var(--vp-c-divider);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
    background-color: var(--vp-c-bg);
    color: var(--vp-c-text-1);
}

#search-input:focus {
    border-color: var(--vp-c-brand-1);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--vp-c-brand-1) 18%, transparent);
}

/* Mobile Optimizations */
@media (max-width: 600px) {
    body {
        padding: calc(var(--vp-nav-height) + 16px) 16px 24px;
    }

    .PTDateSelect {
        min-width: 0;
        width: 100%;
        padding: 12px;
        font-size: 1rem;
    }

    #search-input {
        width: 100%;
    }

    .paper-card {
        padding: 16px;
        margin-bottom: 16px;
    }

    .paper-title {
        font-size: 1.15rem; /* Larger for readability */
    }
    
    .paper-meta {
        font-size: 0.8rem;
        gap: 8px;
    }

    .daily-summary {
        font-size: 0.95rem; /* Readable text */
        padding: 12px;
    }
    
    .summary-label {
         font-size: 0.7rem;
    }
    
    summary {
        padding: 12px 0; /* Easier to tap */
    }
}

/* ===== Invite-code Gate ===== */
body.pt-locked {
    overflow: hidden;
}

.pt-gate {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    padding: 24px;
}

.pt-gate[hidden] {
    display: none;
}

.pt-gate-card {
    width: min(480px, 100%);
    background: var(--vp-c-bg);
    border-radius: 16px;
    padding: 40px 32px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, .25);
    text-align: center;
    animation: pt-gate-in .4s ease;
}

@keyframes pt-gate-in {
    from { opacity: 0; transform: translateY(16px) scale(.97); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

.pt-gate-logo {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -.5px;
}

.pt-gate-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--vp-c-text-1);
    margin: 0 0 12px;
}

.pt-gate-desc {
    font-size: .92rem;
    color: var(--vp-c-text-2);
    line-height: 1.7;
    margin: 0 0 20px;
}

.pt-gate-notice {
    background: color-mix(in srgb, var(--vp-c-brand-1) 8%, var(--vp-c-bg-alt));
    border: 1px solid color-mix(in srgb, var(--vp-c-brand-1) 20%, transparent);
    border-radius: 10px;
    padding: 14px 16px;
    font-size: .88rem;
    color: var(--vp-c-text-2);
    line-height: 1.65;
    margin-bottom: 24px;
    text-align: left;
}

.pt-gate-notice-icon {
    margin-right: 6px;
}

.pt-gate-form {
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
}

.pt-gate-input {
    flex: 1;
    padding: 10px 14px;
    border-radius: 10px;
    border: 1px solid var(--vp-c-divider);
    font-size: .95rem;
    background: var(--vp-c-bg-alt);
    color: var(--vp-c-text-1);
    outline: none;
    transition: border-color .2s;
}

.pt-gate-input:focus {
    border-color: var(--vp-c-brand-1);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--vp-c-brand-1) 18%, transparent);
}

.pt-gate-btn {
    padding: 10px 24px;
    border: none;
    border-radius: 10px;
    background: var(--vp-c-brand-1);
    color: #fff;
    font-size: .95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background .2s;
    white-space: nowrap;
}

.pt-gate-btn:hover {
    background: var(--vp-c-brand-2);
}

.pt-gate-error {
    color: #ef4444;
    font-size: .85rem;
    margin: 0 0 12px;
}

.pt-gate-footer {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--vp-c-divider);
    font-size: .84rem;
    color: var(--vp-c-text-3);
}

.pt-gate-footer p {
    margin: 0 0 6px;
}

.pt-gate-email {
    color: var(--vp-c-brand-1);
    text-decoration: none;
    font-weight: 600;
}

.pt-gate-email:hover {
    text-decoration: underline;
}

/* ===== Category Tabs ===== */
.PTCategoryTabs {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 4px;
}
.PTCategoryTabs::-webkit-scrollbar { display: none; }

.PTCatTab {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    border-radius: 20px;
    border: 1px solid var(--vp-c-divider);
    background: var(--vp-c-bg);
    color: var(--vp-c-text-2);
    font-size: .9rem;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: all .2s;
}
.PTCatTab:hover {
    border-color: var(--vp-c-brand-1);
    color: var(--vp-c-brand-1);
}
.PTCatTab.active {
    background: var(--vp-c-brand-1);
    color: #fff;
    border-color: var(--vp-c-brand-1);
}
.PTCatCount {
    font-size: .75rem;
    font-weight: 600;
    background: rgba(255,255,255,.25);
    border-radius: 10px;
    padding: 1px 7px;
    min-width: 18px;
    text-align: center;
}
.PTCatTab:not(.active) .PTCatCount {
    background: var(--vp-c-bg-soft);
    color: var(--vp-c-text-3);
}

/* ===== Source Filter ===== */
.PTSourceFilter {
    padding: 8px 12px;
    border-radius: 20px;
    border: 1px solid var(--vp-c-divider);
    background: var(--vp-c-bg);
    color: var(--vp-c-text-1);
    font-size: .9rem;
    cursor: pointer;
    outline: none;
    transition: border-color .2s;
}
.PTSourceFilter:focus {
    border-color: var(--vp-c-brand-1);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--vp-c-brand-1) 18%, transparent);
}

/* ===== Paper Card Head (badges + fav) ===== */
.paper-card-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 8px;
}
.paper-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
}

/* Source badges */
.PTSourceBadge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: .72rem;
    font-weight: 600;
    letter-spacing: .3px;
}
.PTSrc-arxiv {
    background: color-mix(in srgb, #b31b1b 12%, var(--vp-c-bg-soft));
    color: #b31b1b;
    border: 1px solid color-mix(in srgb, #b31b1b 25%, transparent);
}
html.dark .PTSrc-arxiv {
    color: #f87171;
    background: color-mix(in srgb, #f87171 12%, var(--vp-c-bg-soft));
    border-color: color-mix(in srgb, #f87171 25%, transparent);
}
.PTSrc-huggingface {
    background: color-mix(in srgb, #ff9d00 12%, var(--vp-c-bg-soft));
    color: #b36b00;
    border: 1px solid color-mix(in srgb, #ff9d00 25%, transparent);
}
html.dark .PTSrc-huggingface {
    color: #fbbf24;
    background: color-mix(in srgb, #fbbf24 12%, var(--vp-c-bg-soft));
    border-color: color-mix(in srgb, #fbbf24 25%, transparent);
}
.PTSrc-conference {
    background: color-mix(in srgb, #7c3aed 12%, var(--vp-c-bg-soft));
    color: #7c3aed;
    border: 1px solid color-mix(in srgb, #7c3aed 25%, transparent);
}
html.dark .PTSrc-conference {
    color: #a78bfa;
    background: color-mix(in srgb, #a78bfa 12%, var(--vp-c-bg-soft));
    border-color: color-mix(in srgb, #a78bfa 25%, transparent);
}

/* Category badges */
.PTCatBadge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: .72rem;
    font-weight: 500;
}
.PTCatBadge-architecture {
    background: color-mix(in srgb, #0ea5e9 10%, var(--vp-c-bg-soft));
    color: #0284c7;
    border: 1px solid color-mix(in srgb, #0ea5e9 20%, transparent);
}
html.dark .PTCatBadge-architecture { color: #38bdf8; }
.PTCatBadge-compression {
    background: color-mix(in srgb, #10b981 10%, var(--vp-c-bg-soft));
    color: #059669;
    border: 1px solid color-mix(in srgb, #10b981 20%, transparent);
}
html.dark .PTCatBadge-compression { color: #34d399; }
.PTCatBadge-inference {
    background: color-mix(in srgb, #f59e0b 10%, var(--vp-c-bg-soft));
    color: #d97706;
    border: 1px solid color-mix(in srgb, #f59e0b 20%, transparent);
}
html.dark .PTCatBadge-inference { color: #fbbf24; }
.PTCatBadge-infra {
    background: color-mix(in srgb, #8b5cf6 10%, var(--vp-c-bg-soft));
    color: #7c3aed;
    border: 1px solid color-mix(in srgb, #8b5cf6 20%, transparent);
}
html.dark .PTCatBadge-infra { color: #a78bfa; }
.PTCatBadge-algorithm {
    background: color-mix(in srgb, #ec4899 10%, var(--vp-c-bg-soft));
    color: #db2777;
    border: 1px solid color-mix(in srgb, #ec4899 20%, transparent);
}
html.dark .PTCatBadge-algorithm { color: #f472b6; }

/* Venue badge */
.PTVenueBadge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: .72rem;
    font-weight: 600;
    background: color-mix(in srgb, var(--vp-c-brand-1) 10%, var(--vp-c-bg-soft));
    color: var(--vp-c-brand-1);
    border: 1px solid color-mix(in srgb, var(--vp-c-brand-1) 20%, transparent);
    text-transform: uppercase;
    letter-spacing: .5px;
}

/* HF Upvote */
.PTUpvote {
    font-size: .78rem;
    font-weight: 600;
    color: #ef4444;
    white-space: nowrap;
}

/* ===== Mobile: Category Tabs ===== */
@media (max-width: 600px) {
    .PTCategoryTabs {
        gap: 6px;
        margin-bottom: 14px;
    }
    .PTCatTab {
        padding: 6px 12px;
        font-size: .82rem;
    }
    .PTFilterBar {
        gap: 8px;
    }
    .PTSourceFilter {
        width: 100%;
    }
    .paper-badges {
        gap: 4px;
    }
}

/* ===== Tiered display: Section headers ===== */
.PTSectionHeader {
    grid-column: 1 / -1;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--vp-c-text-1);
    margin: 24px 0 12px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--vp-c-brand-1);
    display: flex;
    align-items: center;
    gap: 8px;
}
.PTSectionHeader:first-child {
    margin-top: 0;
}
.PTSectionHeader--compact {
    border-bottom-color: var(--vp-c-divider);
    margin-top: 32px;
}
.PTSectionCount {
    font-size: .75rem;
    font-weight: 600;
    background: var(--vp-c-bg-soft);
    color: var(--vp-c-text-3);
    border-radius: 10px;
    padding: 2px 8px;
}

/* ===== Compact list (arXiv papers) ===== */
.PTCompactList {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    gap: 0;
    border: 1px solid var(--vp-c-divider);
    border-radius: 8px;
    overflow: hidden;
}
.PTCompactRow {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 16px;
    background: var(--card-bg);
    border-bottom: 1px solid var(--vp-c-divider);
    transition: background .15s;
}
.PTCompactRow:last-child {
    border-bottom: none;
}
.PTCompactRow:hover {
    background: var(--vp-c-bg-soft);
}
.PTCompactRow-main {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
    flex: 1;
}
.PTCompactRow-title {
    font-size: .92rem;
    font-weight: 500;
    color: var(--vp-c-text-1);
    text-decoration: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color .2s;
}
.PTCompactRow-title:hover {
    color: var(--vp-c-brand-1);
}
.PTCompactRow-right {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
}
.pt-fav-btn--sm {
    font-size: .85rem;
    padding: 2px 4px;
    line-height: 1;
}

/* Mobile compact */
@media (max-width: 600px) {
    .PTCompactRow {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
        padding: 10px 12px;
    }
    .PTCompactRow-title {
        white-space: normal;
        font-size: .88rem;
    }
    .PTCompactRow-right {
        flex-wrap: wrap;
    }
}