:root {
  --bg: #eff5f7;
  --surface: #ffffff;
  --ink: #112434;
  --subtle: #516476;
  --line: #d2dde6;
  --brand: #126a73;
  --brand-strong: #0f5561;
  --highlight: #dff2f0;
}

html {
  scroll-behavior: smooth;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Segoe UI", "Arial", sans-serif;
  background:
    radial-gradient(circle at 10% 10%, #e2f2ef 0, transparent 28%),
    radial-gradient(circle at 88% 4%, #e7f0f8 0, transparent 30%),
    linear-gradient(180deg, #edf5f8 0%, #f9fcfe 100%);
}

.container {
  width: min(1080px, 92vw);
  margin: 0 auto;
}

.topbar {
  border-bottom: 1px solid var(--line);
  background: #ffffffdd;
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
}

.topbar .container {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.2px;
}

.nav a {
  color: var(--subtle);
  text-decoration: none;
  margin-left: 10px;
  padding: 8px 10px;
  border-radius: 8px;
}

.nav a:hover {
  color: var(--ink);
  background: #f2f8fb;
}

.nav a.active {
  color: #0f2a2f;
  background: var(--highlight);
  border: 1px solid #c5e7e3;
}

.hero {
  padding: 28px 0 10px;
}

.hero h1 {
  margin: 0 0 8px;
}

.hero p {
  color: var(--subtle);
  margin: 0;
}

.hero-meta {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  font-size: 12px;
  padding: 5px 8px;
  border-radius: 999px;
  border: 1px solid #cde1ef;
  background: #f2f8fc;
  color: #294354;
}

.card {
  margin: 16px 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
}

.panel h3 {
  margin-top: 0;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

input[type="file"] {
  width: 100%;
  margin: 6px 0 10px;
}

input[type="text"],
input[type="number"] {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px;
  margin: 6px 0 10px;
}

label {
  font-size: 14px;
  color: #244154;
}

select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px;
  margin: 6px 0 10px;
  background: #fff;
}

button {
  border: 0;
  background: var(--brand);
  color: #fff;
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
}

button:hover {
  background: var(--brand-strong);
}

button.secondary {
  background: #e6f2f1;
  color: #234;
  border: 1px solid #c3ddda;
}

button.secondary:hover {
  background: #d9eeeb;
}

.button-link,
.button-link:visited {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid #0f5561;
  background: linear-gradient(135deg, #13879a 0%, #126a73 55%, #0f5561 100%);
  color: #fff;
  padding: 10px 16px;
  border-radius: 10px;
  cursor: pointer;
  text-decoration: none !important;
  color: #ffffff !important;
  margin-top: 8px;
  font-weight: 600;
  letter-spacing: 0.2px;
  box-shadow: 0 6px 14px rgba(16, 85, 97, 0.24);
  transition: transform 0.15s ease, box-shadow 0.15s ease, filter 0.15s ease;
}

.button-link:hover,
.button-link:focus-visible {
  filter: brightness(1.02);
  transform: translateY(-1px);
  box-shadow: 0 9px 18px rgba(16, 85, 97, 0.3);
  text-decoration: none !important;
}

.button-link:active {
  transform: translateY(0);
  box-shadow: 0 4px 10px rgba(16, 85, 97, 0.2);
}

.hint {
  margin: 10px 0 0;
  color: var(--subtle);
  min-height: 20px;
}

.lead {
  color: var(--subtle);
  margin-top: 0;
}

.doc-list {
  margin: 0;
  padding-left: 20px;
}

.doc-list li {
  margin: 6px 0;
}

.sub-list {
  margin-top: 8px;
  padding-left: 22px;
}

.sub-list li {
  margin: 4px 0;
}

.doc-list a {
  color: var(--brand-strong);
  text-decoration: none;
}

.doc-list a:hover {
  text-decoration: underline;
}

.image-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.image-grid img {
  width: 100%;
  border-radius: 10px;
  border: none;
  background: #fff;
}

.content-image {
  width: 80%;
  max-width: 100%;
  height: auto;
  display: block;
  margin: 10px auto 0;
  border: none;
  border-radius: 10px;
}

.ranking-image {
  width: 100%;
}

.file-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.file-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
}

.file-list a {
  color: var(--brand-strong);
  text-decoration: none;
}

.file-list a:hover {
  text-decoration: underline;
}

.muted {
  color: var(--subtle);
  font-size: 13px;
}

.table-wrap {
  overflow: auto;
}

.tab-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 8px 0 14px;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #c3ddda;
  background: #e6f2f1;
  color: #234;
  padding: 8px 12px;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
}

.tab-btn:visited {
  color: #234;
  text-decoration: none;
}

.tab-btn:hover {
  background: #d9eeeb;
}

.tab-btn.active {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.table-note {
  margin: 12px 0 8px;
  color: var(--subtle);
  font-size: 14px;
}

.chart-caption {
  margin: 10px 0 0;
  color: var(--subtle);
  text-align: center;
  font-size: 14px;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 840px;
}

th,
td {
  padding: 10px 8px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  font-size: 14px;
}

th {
  color: var(--subtle);
  font-weight: 600;
}

.formula {
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f8fcff;
  font-family: "Consolas", "Courier New", monospace;
  font-size: 13px;
  margin: 10px 0;
  overflow: auto;
}

.footer {
  color: var(--subtle);
  padding: 24px 0 40px;
}

@media (max-width: 800px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .image-grid {
    grid-template-columns: 1fr;
  }
}