styles.css

:root {
  --bg: #edf4fb;
  --bg-strong: #d8e7f9;
  --surface: rgba(255, 255, 255, 0.84);
  --surface-strong: #ffffff;
  --surface-alt: #f4f7fb;
  --border: rgba(31, 71, 132, 0.12);
  --border-strong: rgba(31, 71, 132, 0.18);
  --text: #16304d;
  --text-soft: #60738c;
  --text-faint: #8b9ab0;
  --primary: #1f5ed8;
  --primary-strong: #183d90;
  --primary-soft: #e8f0ff;
  --shadow: 0 18px 45px rgba(18, 52, 100, 0.12);
  --shadow-soft: 0 8px 24px rgba(18, 52, 100, 0.08);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 999px;
  --font-sans: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: var(--font-sans);
  background:
    radial-gradient(circle at top left, rgba(73, 128, 255, 0.18), transparent 32%),
    radial-gradient(circle at top right, rgba(34, 197, 94, 0.12), transparent 24%),
    linear-gradient(180deg, #f4f8fc 0%, var(--bg) 48%, #e6eef7 100%);
}

img {
  max-width: 100%;
  display: block;
}

button,
input,
summary {
  font: inherit;
}

button {
  cursor: pointer;
}

.page-shell {
  min-height: 100vh;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 48px 24px 58px;
  background:
    linear-gradient(135deg, #132b59 0%, #1d4fa7 52%, #2f78ff 100%);
  color: #ffffff;
  box-shadow: inset 0 -1px 0 rgba(255, 255, 255, 0.08);
}

.hero__inner,
.page-main,
.site-footer {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
}

.hero__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 18px;
  z-index: 1;
}

.hero__badge {
  display: grid;
  place-items: center;
  width: 62px;
  height: 62px;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(12px);
  font-size: 30px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.hero__eyebrow {
  margin: 0 0 8px;
  color: rgba(216, 231, 255, 0.8);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero__title {
  margin: 0;
  font-size: clamp(30px, 5vw, 40px);
  font-weight: 800;
  letter-spacing: 0.04em;
}

.hero__subtitle {
  margin: 10px 0 0;
  color: rgba(226, 237, 255, 0.9);
  font-size: 15px;
}

.hero__glow {
  position: absolute;
  border-radius: 999px;
  filter: blur(12px);
  opacity: 0.78;
}

.hero__glow--left {
  top: -48px;
  left: -80px;
  width: 220px;
  height: 220px;
  background: radial-gradient(circle, rgba(96, 165, 250, 0.52), transparent 65%);
}

.hero__glow--right {
  right: -70px;
  bottom: -60px;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(45, 212, 191, 0.24), transparent 68%);
}

.page-main {
  padding: 28px 0 48px;
}

.panel {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-soft);
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.section-kicker {
  margin: 0 0 6px;
  color: var(--primary);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-title {
  margin: 0;
  font-size: 22px;
  font-weight: 800;
}

.stats-layout {
  margin-bottom: 22px;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.stat-card {
  position: relative;
  overflow: hidden;
  padding: 22px 22px 18px;
  border-radius: var(--radius-lg);
  color: #ffffff;
  box-shadow: var(--shadow);
}

.stat-card::after {
  content: "";
  position: absolute;
  inset: auto -22px -36px auto;
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
}

.stat-card--blue {
  background: linear-gradient(135deg, #1b4bc5, #2b73f4);
}

.stat-card--red {
  background: linear-gradient(135deg, #bb2b2b, #e34b3d);
}

.stat-card--gold {
  background: linear-gradient(135deg, #c96a18, #f0a333);
}

.stat-card--green {
  background: linear-gradient(135deg, #0d8f63, #30b37d);
}

.stat-card--rose {
  background: linear-gradient(135deg, #c2416c, #eb5f8f);
}

.stat-card--violet {
  background: linear-gradient(135deg, #6d28d9, #8b5cf6);
}

.stat-card--indigo {
  background: linear-gradient(135deg, #3730a3, #4f46e5);
}

.stat-card--teal {
  background: linear-gradient(135deg, #0f766e, #14b8a6);
}

.stat-card--sky {
  background: linear-gradient(135deg, #0369a1, #0ea5e9);
}

.stat-card--slate {
  background: linear-gradient(135deg, #475569, #64748b);
}

.stat-card__value {
  display: block;
  font-size: clamp(34px, 4vw, 42px);
  font-weight: 800;
  line-height: 1;
}

.stat-card__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  opacity: 0.92;
}

.stat-card__note {
  display: block;
  margin-top: 4px;
  font-size: 11px;
  font-weight: 700;
  line-height: 1.35;
  opacity: 0.78;
}

.chart-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 14px;
}

.chart-card {
  padding: 20px;
}

.chart-card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.chart-card__head h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
}

.chart-card__head span {
  color: var(--text-faint);
  font-size: 12px;
}

.year-chart__table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
}

.year-chart__table tbody tr + tr {
  border-top: 1px solid rgba(31, 71, 132, 0.08);
}

.year-chart__table tbody th,
.year-chart__table tbody td {
  padding: 14px 10px;
  vertical-align: middle;
}

.year-chart__label {
  width: 72px;
  padding-left: 0;
  color: var(--text-faint);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-align: left;
  text-transform: uppercase;
}

.year-chart__year-cell {
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 700;
  text-align: center;
}

.year-chart__bar-track {
  width: 100%;
  height: 168px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  overflow: hidden;
  padding: 10px 8px;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(39, 99, 235, 0.08), rgba(39, 99, 235, 0.03));
  border: 1px solid rgba(39, 99, 235, 0.08);
}

.year-chart__bar-fill {
  width: 100%;
  height: var(--bar-height);
  min-height: 10%;
  border-radius: 12px 12px 8px 8px;
  background: linear-gradient(180deg, #2e74ff 0%, #1d4ed8 100%);
  box-shadow: 0 8px 16px rgba(29, 78, 216, 0.18);
}

.year-chart__count {
  color: var(--primary-strong);
  font-size: 13px;
  font-weight: 800;
  text-align: center;
}

.ccf-chart__wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 220px;
}

.ccf-chart__donut {
  position: relative;
  flex: 0 0 auto;
  width: 170px;
  height: 170px;
}

.ccf-chart__donut svg {
  width: 100%;
  height: 100%;
}

.ccf-chart__ring-bg {
  fill: none;
  stroke: rgba(31, 71, 132, 0.08);
  stroke-width: 16;
}

.ccf-chart__segment {
  fill: none;
  stroke-width: 16;
  transform: rotate(-90deg);
  transform-origin: 70px 70px;
}

.ccf-chart__center {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  text-align: center;
  pointer-events: none;
}

.ccf-chart__center strong {
  display: block;
  font-size: 30px;
  font-weight: 800;
}

.ccf-chart__center span {
  color: var(--text-faint);
  font-size: 12px;
}

.ccf-chart__legend {
  flex: 1;
  min-width: 0;
}

.legend-list {
  display: grid;
  gap: 12px;
}

.legend-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 16px;
  background: rgba(244, 247, 251, 0.95);
  border: 1px solid rgba(31, 71, 132, 0.08);
}

.legend-item__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.legend-item__name {
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 700;
}

.legend-item__value {
  color: var(--text);
  font-size: 13px;
  font-weight: 800;
}

.controls-panel {
  padding: 22px;
  margin-bottom: 16px;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  padding: 15px 18px;
  border: 1px solid rgba(31, 71, 132, 0.12);
  border-radius: 18px;
  background: #f8fbff;
  transition: border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.search-box:focus-within {
  border-color: rgba(29, 78, 216, 0.32);
  background: #ffffff;
  box-shadow: 0 0 0 5px rgba(29, 78, 216, 0.08);
}

.search-box__icon {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  color: var(--text-faint);
}

.search-box__icon svg {
  width: 18px;
  height: 18px;
}

.search-box input {
  flex: 1;
  min-width: 0;
  padding: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font-size: 15px;
}

.search-box input::placeholder {
  color: #98a8bc;
}

.filter-rows {
  display: grid;
  gap: 14px;
}

.filter-row {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.filter-row__label {
  flex: 0 0 82px;
  padding-top: 10px;
  color: var(--text-faint);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.filter-row__chips {
  display: flex;
  flex: 1;
  flex-wrap: wrap;
  gap: 9px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid rgba(31, 71, 132, 0.12);
  border-radius: var(--radius-sm);
  background: #ffffff;
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 700;
  transition:
    transform 160ms ease,
    border-color 160ms ease,
    box-shadow 160ms ease,
    background 160ms ease,
    color 160ms ease;
}

.chip:hover {
  transform: translateY(-1px);
  border-color: rgba(29, 78, 216, 0.24);
  box-shadow: 0 8px 16px rgba(20, 61, 126, 0.08);
}

.chip.is-active {
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 12px 22px rgba(20, 61, 126, 0.16);
}

.chip__count {
  opacity: 0.78;
}

.chip--blue.is-active {
  background: linear-gradient(135deg, #1d4ed8, #2563eb);
}

.chip--red.is-active {
  background: linear-gradient(135deg, #b91c1c, #dc2626);
}

.chip--orange.is-active {
  background: linear-gradient(135deg, #c96a18, #f08c26);
}

.chip--green.is-active {
  background: linear-gradient(135deg, #15803d, #16a34a);
}

.chip--slate.is-active {
  background: linear-gradient(135deg, #64748b, #7c8799);
}

.chip--purple.is-active {
  background: linear-gradient(135deg, #6d28d9, #7c3aed);
}

.chip--indigo.is-active {
  background: linear-gradient(135deg, #4338ca, #4f46e5);
}

.chip--sky.is-active {
  background: linear-gradient(135deg, #0284c7, #0ea5e9);
}

.chip--teal.is-active {
  background: linear-gradient(135deg, #0f766e, #14b8a6);
}

.chip--amber.is-active {
  background: linear-gradient(135deg, #d97706, #f59e0b);
}

.chip--rose.is-active {
  background: linear-gradient(135deg, #be185d, #ec4899);
}

.results-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
  padding: 0 4px;
}

.results-strip__meta {
  display: grid;
  gap: 4px;
}

.results-strip__count {
  margin: 0;
  color: var(--text-soft);
  font-size: 14px;
}

.results-strip__count strong {
  color: var(--text);
}

.results-strip__summary {
  margin: 0;
  color: var(--text-faint);
  font-size: 12px;
  text-align: right;
}

.sort-controls {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.sort-button {
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid rgba(31, 71, 132, 0.12);
  border-radius: var(--radius-sm);
  background: #ffffff;
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 700;
  transition:
    transform 160ms ease,
    border-color 160ms ease,
    box-shadow 160ms ease,
    background 160ms ease,
    color 160ms ease;
}

.sort-button:hover {
  transform: translateY(-1px);
  border-color: rgba(29, 78, 216, 0.24);
  box-shadow: 0 8px 16px rgba(20, 61, 126, 0.08);
}

.sort-button.is-active {
  color: #ffffff;
  border-color: transparent;
  background: linear-gradient(135deg, #1d4ed8, #2563eb);
  box-shadow: 0 12px 22px rgba(20, 61, 126, 0.16);
}

.ghost-button {
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid rgba(220, 38, 38, 0.16);
  border-radius: var(--radius-sm);
  background: rgba(254, 242, 242, 0.96);
  color: #c72d2d;
  font-size: 13px;
  font-weight: 700;
}

.ghost-button:hover {
  background: #fff5f5;
}

.papers-list {
  display: grid;
  gap: 14px;
}

.paper-card {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow-soft);
}

.paper-card__body {
  padding: 22px;
}

.paper-card__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.badge--ccf-a {
  background: #c52b2b;
  color: #ffffff;
}

.badge--ccf-b {
  background: #e88b25;
  color: #ffffff;
}

.badge--ccf-c {
  background: #159a53;
  color: #ffffff;
}

.badge--ccf-none {
  background: #94a3b8;
  color: #ffffff;
}

.badge--core-star {
  background: #6d28d9;
  color: #ffffff;
}

.badge--core-a {
  background: #4f46e5;
  color: #ffffff;
}

.badge--core-b {
  background: #0ea5e9;
  color: #ffffff;
}

.badge--core-c {
  background: #14b8a6;
  color: #ffffff;
}

.badge--thcpl-a {
  background: #be185d;
  color: #ffffff;
}

.badge--thcpl-b {
  background: #d97706;
  color: #ffffff;
}

.badge--ncs-main {
  background: #6d28d9;
  color: #ffffff;
}

.badge--ncs-sub {
  background: #4338ca;
  color: #ffffff;
}

.badge--sci-1 {
  background: #ccfbf1;
  color: #0f766e;
}

.badge--sci-2 {
  background: #e0f2fe;
  color: #0369a1;
}

.badge--sci-3 {
  background: #e2e8f0;
  color: #475569;
}

.badge--soft {
  background: #eef4ff;
  color: #315caa;
}

.badge--direction-blue {
  background: #e8f0ff;
  color: #2563eb;
}

.badge--direction-violet {
  background: #f1e8ff;
  color: #7c3aed;
}

.badge--direction-amber {
  background: #fff3df;
  color: #c96a18;
}

.badge--direction-cyan {
  background: #e4fbff;
  color: #0e7490;
}

.badge--direction-rose {
  background: #ffe8ef;
  color: #d94670;
}

.badge--direction-fuchsia {
  background: #fbe8ff;
  color: #c026d3;
}

.badge--direction-lime {
  background: #eefad7;
  color: #5f8f0a;
}

.badge--muted {
  background: #eef3f8;
  color: #65758c;
}

.badge--accepted {
  background: #ecfdf5;
  color: #0f8c57;
}

.paper-card__title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.45;
}

.paper-card__authors {
  margin: 0 0 10px;
  color: var(--text-soft);
  font-size: 14px;
  line-height: 1.7;
}

.paper-card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  color: var(--text-soft);
  font-size: 13px;
}

.paper-card__venue {
  color: var(--text);
  font-weight: 700;
}

.field-tag {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border: 1px solid rgba(31, 71, 132, 0.1);
  border-radius: var(--radius-sm);
  background: #f4f7fb;
  color: var(--text-soft);
  font-size: 12px;
  font-weight: 700;
}

.paper-card__meta-link {
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}

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

.paper-card__content {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(280px, 1.15fr);
  gap: 16px;
  margin-top: 18px;
  align-items: stretch;
}

.paper-card__panel {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  border: 1px solid rgba(31, 71, 132, 0.08);
  border-radius: 20px;
  background: linear-gradient(180deg, rgba(248, 251, 255, 0.98), rgba(243, 248, 253, 0.92));
}

.paper-card__panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 14px 16px 0;
  color: var(--text-faint);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.paper-abstract {
  margin: 0;
  padding: 14px 16px 16px;
  color: var(--text-soft);
  font-size: 14px;
  line-height: 1.8;
}

.paper-abstract.is-placeholder {
  color: var(--text-faint);
}

.paper-card__figure {
  margin: 0;
  overflow: hidden;
}

.paper-card__figure-media {
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: center;
  min-height: 240px;
  padding: 14px 16px 10px;
}

.paper-card__figure img {
  width: 100%;
  max-height: 340px;
  border-radius: 16px;
  background: #e9eef6;
  object-fit: contain;
  box-shadow: 0 12px 28px rgba(19, 54, 108, 0.1);
}

.paper-card__figure-placeholder {
  display: grid;
  gap: 8px;
  width: 100%;
  min-height: 220px;
  place-items: center;
  padding: 18px;
  border: 1px dashed rgba(31, 71, 132, 0.18);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.76);
  color: var(--text-faint);
  text-align: center;
}

.paper-card__figure-placeholder strong {
  color: var(--text-soft);
  font-size: 14px;
}

.empty-state {
  padding: 64px 24px;
  border: 1px dashed rgba(31, 71, 132, 0.18);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.62);
  color: var(--text-soft);
  text-align: center;
}

.empty-state h3 {
  margin: 0 0 10px;
  color: var(--text);
  font-size: 22px;
}

.empty-state p {
  margin: 0;
  line-height: 1.8;
}

.site-footer {
  padding: 24px 0 40px;
  color: var(--text-faint);
  font-size: 12px;
  text-align: center;
}

.site-footer__text {
  margin: 0;
}

.site-footer__button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  margin-top: 14px;
  padding: 0 16px;
  border: 1px solid rgba(31, 71, 132, 0.12);
  border-radius: var(--radius-sm);
  background: #ffffff;
  color: var(--primary);
  font-size: 13px;
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 8px 18px rgba(18, 52, 100, 0.08);
  transition:
    transform 160ms ease,
    border-color 160ms ease,
    box-shadow 160ms ease,
    background 160ms ease;
}

.site-footer__button:hover {
  transform: translateY(-1px);
  border-color: rgba(29, 78, 216, 0.24);
  background: #f8fbff;
  box-shadow: 0 12px 22px rgba(18, 52, 100, 0.12);
}

@media (max-width: 1200px) {
  .summary-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 980px) {
  .summary-grid,
  .chart-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .paper-card__content {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 720px) {
  .hero {
    padding: 38px 0 46px;
  }

  .hero__inner,
  .page-main,
  .site-footer {
    width: min(100vw - 24px, 1180px);
  }

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

  .controls-panel,
  .chart-card,
  .paper-card__body {
    padding: 18px;
  }

  .paper-card__panel-head {
    padding: 12px 14px 0;
  }

  .paper-abstract,
  .paper-card__figure-media {
    padding-left: 14px;
    padding-right: 14px;
  }

  .filter-row {
    flex-direction: column;
    gap: 10px;
  }

  .filter-row__label {
    flex-basis: auto;
    padding-top: 0;
  }

  .results-strip {
    flex-direction: column;
    align-items: flex-start;
  }

  .results-strip__summary {
    text-align: left;
  }

  .sort-controls {
    flex-wrap: wrap;
  }

  .year-chart__bar-cell {
    padding-left: 10px;
    padding-right: 10px;
  }
}