:root{
    --bg:#f5f7fb;
    --card:#ffffff;
    --accent:#1f4b99;
    --muted:#6b7280;
    --teal:#0b7285;
    --gold:#b7791f;
    --purple:#6d28d9;
    --slate:#334155;
}
body {
        background-color: var(--bg);
        font-family: 'Segoe UI', Roboto, Arial, sans-serif;
        color: #111827;
        margin: 0;
}

.title {
    font-weight: 600;
    color: var(--purple);
}

hr {
    border: 0;
    height: 1px;
    background: linear-gradient(to right, transparent, rgba(0,0,0,0.08), transparent);
    margin: 1rem 0;
}

input, textarea, select {
        border-radius: 8px;
        border: 1px solid #d1d5db;
        background-color: #fff;
        padding: 8px 10px;
        box-shadow: none;
}

button {
    border-radius: 8px;
    border: none;
    background-color: var(--accent);
    color: white;
    padding: 8px 12px;
    cursor: pointer;
}
button, .vote-button, .delete-comment-btn {
    transition: transform 120ms ease, box-shadow 120ms ease, background-color 120ms ease;
}

button:focus, .vote-button:focus, .delete-comment-btn:focus {
    outline: 3px solid rgba(31,75,153,0.15);
    outline-offset: 2px;
}

button:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(31,75,153,0.12);
}

button:active {
    transform: translateY(0);
}

/* vote button subtle hover */
.vote-button:hover { background-color: #f3f4f6; }

/* delete button distinct danger style */
.delete-comment-btn {
    background: transparent;
    color: #b91c1c;
    border: 1px solid rgba(185,28,28,0.12);
    padding: 6px 10px;
    border-radius: 8px;
}
.delete-comment-btn:hover {
    background: rgba(185,28,28,0.06);
    color: #991b1b;
    transform: translateY(-1px);
}
.delete-comment-btn:active { transform: translateY(0); }

select {
    border-radius: 5px;
    background-color: lightgrey;
}

input:focus {
    border: black;
}

table, th, td{
    border: 1px solid black;
    border-collapse: collapse;
    border-spacing: 0;
    padding: 5px;
    text-align: left;
}

tr:hover{
    background-color: rgba(0,0,0,0.03);
}

.card {
    background: var(--card);
    border-radius: 10px;
    box-shadow: 0 1px 3px rgba(16,24,40,0.06);
    padding: 14px;
    margin: 10px 0;
}

.paper-row { display:flex; gap:16px; align-items:flex-start; border-radius:8px; padding:12px; background:var(--card); box-shadow:0 1px 2px rgba(16,24,40,0.04); }
.paper-row + .paper-row { margin-top:10px; }
.paper-meta { color:var(--muted); font-size:0.95rem; }
.paper-body { flex:1; }
.paper-title { font-size:1.05rem; font-weight:600; color:var(--slate); margin-bottom:6px; }
.paper-authors { color:var(--muted); margin-bottom:6px; }
.paper-abstract { margin-top:8px; color:#374151; }
.paper-links a { color:var(--teal); word-break:break-all; }

/* grid of papers for submit page */
.papers-grid { display:grid; grid-template-columns: 1fr; gap:8px; align-items:start; }
/* Make each paper-wrap a vertical flex container that stretches to equal height */
.paper-wrap { display:flex; flex-direction:column; height:100%; align-items:stretch; }
/* The visible card area should grow to fill available space so action-bar sits at bottom */
.paper-wrap .paper-item { flex: 1 1 auto; display:flex; flex-direction:column; min-height: 300px; padding: 12px; }
/* Ensure content inside the card flows vertically and can push the actions down */
.paper-wrap .paper-item > * { /* keep children layout natural */ }
/* action-bar should stay visually attached to the bottom of the wrap */
.action-bar { margin-top:8px; display:flex; align-items:center; justify-content:flex-start; align-self:stretch; gap:8px; flex-wrap:wrap; }
.action-row { display:flex; gap:8px; align-items:center; justify-content:flex-start; }

/* keep buttons grouped to the left; allow other elements to be pushed right by adding a utility class in templates if needed */
.action-bar > button, .action-bar .btn, .action-bar input[type=submit], .action-bar .vote-button {
    margin-right: 8px;
}

/* Ensure inside the card any .votes or spanners push to bottom if needed */
.paper-item .votes { margin-top: auto; }

/* ensure vote action aligns visually */
.paper-item .votes { margin-top:auto; }

.card small {
    color: var(--muted);
}

.vote {
    padding: 6px 0;
}

.vote-button {
    background: #f9fafb; /* very light */
    color: #0f172a; /* dark text */
    border: 1px solid #e5e7eb;
    padding: 6px 10px;
    border-radius: 8px;
}
.vote-button:hover { background: #eef2ff; }
.vote-button:active { transform: translateY(0); }

.vote input {
    color: black;
}

.votes {
    font-weight: 600;
}

a { color: var(--accent); }

/* navbar tweak - give subtle color band */
.navbar {
    background: linear-gradient(90deg, rgba(31,75,153,0.05), rgba(109,40,217,0.03));
    border-bottom: 1px solid rgba(17,24,39,0.04);
}

/* card header / metadata chips */
.card .header {
    display:flex; align-items:center; gap:10px; margin-bottom:8px;
}
.chip {
    display:inline-block; padding:4px 8px; border-radius:999px; font-size:0.85rem;
    background: linear-gradient(180deg, rgba(15,23,42,0.03), rgba(15,23,42,0.01));
    color: var(--slate); border:1px solid rgba(15,23,42,0.06);
}
.chip.accent { background: rgba(31,75,153,0.08); color: var(--teal); border-color: rgba(11,114,133,0.12); }
.chip.gold { background: rgba(183,121,31,0.06); color: var(--gold); border-color: rgba(183,121,31,0.12); }
.chip.purple { background: rgba(109,40,217,0.06); color: var(--purple); border-color: rgba(109,40,217,0.12); }

/* responsive container tweaks */
.container { max-width: 1200px; margin: 0 auto; padding: 18px; }

/* history grouping styles */
.history-year { padding:16px; margin-bottom:14px; }
.history-year h3 { margin:0 0 8px 0; color:var(--slate); }
.history-months { display:flex; gap:12px; flex-wrap:wrap; }
.history-month { background: linear-gradient(180deg, rgba(243,244,246,0.6), rgba(255,255,255,0.6)); padding:10px; border-radius:8px; min-width:180px; }
.history-month h4 { margin:0 0 6px 0; font-size:0.95rem; }
.history-weeks { display:flex; gap:6px; flex-wrap:wrap; }

/* small filter input */
.list-filter { margin-bottom: 12px; display:flex; gap:8px; align-items:center; }
.list-filter input { flex:1; }

/* Papers panel - tall to fit multiple paper cards */
.papers-panel .panel-body {
    min-height: 560px;
    overflow: auto;
}

/* Uploads panel - shorter, just needs file upload form + file list */
.uploads-panel .panel-body {
    min-height: 250px;
    min-width: 100px;
    overflow: auto;
}

/* Make upload file input and upload list comfortable */
.uploads-panel .form-control-file { display:block; width:100%; }
.uploads-panel ul { margin: 0; padding-left: 0.75rem; }
.uploads-panel li { word-break: break-word; }

@media (max-width:600px){
    .container { padding: 12px; }
}

/* Widen the Papers column slightly on the submit page so it fits contents (~2cm wider) */
.submit-row .col-md-8 {
    flex: 0 0 76%;
    max-height: fit-content;
    max-width: 76%;

}
.submit-row .col-md-4 {
    flex: 0 0 24%;
    max-height: fit-content;
    max-width: 24%;
}

@media (max-width: 991px) {
    /* revert to stacked layout on small screens */
    .submit-row .col-md-8,
    .submit-row .col-md-4 {
        flex: 0 0 auto;
        max-width: 100%;
    }
}

/* Make the submit row and its columns stretch so panels can grow vertically */
.submit-row { display:flex; gap:16px; align-items:stretch; }
.submit-row .col-md-8, .submit-row .col-md-4 { display:flex; flex-direction:column; }
.submit-row .col-md-8 > .panel, .submit-row .col-md-4 > .panel { display:flex; flex-direction:column; flex:1 1 auto; }

/* Slightly increase paper card min-height so action bar doesn't overlap */
.paper-wrap .paper-item { min-height: 360px; }

/* Ensure long titles, links and abstracts wrap instead of overflowing */
.paper-item .paper-title,
.paper-item .paper-authors,
.paper-item .paper-abstract,
.paper-item .paper-links {
    overflow-wrap: anywhere;
    word-break: break-word;
}