:root {
  --bg: #FFFFFF;
  --ink: #1A1A1A;
  --muted: #666666;
  --line: #E6E6E6;
  --panel: #F7F7F7;
  --peach: #F8E6D8;
  --orange: #DF501E;
  --orange-dark: #C44518;
  --blue: #96C8DB;
  --green: #56B78A;
  --green-dark: #00923F;
  --yellow: #FFF500;
  --max: 1180px;
  --sans: "Source Sans 3", "Segoe UI", system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.5;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--orange); text-underline-offset: 0.12em; }
a:hover { color: var(--orange-dark); }
:focus-visible { outline: 3px solid var(--orange); outline-offset: 2px; }
.shell { width: min(100% - 1.25rem, var(--max)); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

.color-rail {
  height: 4px;
  background: linear-gradient(90deg, #96C8DB 0 16.6%, #56B78A 16.6% 33.2%, #FFF500 33.2% 49.8%, #F2AD7B 49.8% 66.4%, #DF501E 66.4% 83%, #C44518 83% 100%);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.1rem;
}
.brand img { height: 36px; width: auto; }
.nav-tools { display: flex; align-items: center; gap: 0.55rem; }
.nav {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 1rem;
}
.nav a {
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--orange); }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.55rem 0.95rem;
  border-radius: 8px;
  font: inherit;
  font-weight: 700;
  text-decoration: none !important;
  cursor: pointer;
  border: 0;
}
.btn-outline {
  border: 1.5px solid var(--orange);
  color: var(--orange) !important;
  background: #fff;
}
.btn-outline:hover { background: #FFF4EF; }
.btn-orange {
  background: var(--orange);
  color: #fff !important;
}
.btn-orange:hover { background: var(--orange-dark); }
.btn-wide { width: 100%; }
.icon-btn, .menu-btn {
  width: 2.4rem;
  height: 2.4rem;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
}
@media (min-width: 920px) {
  .nav { display: flex; }
  .menu-btn { display: none; }
}
.mobile-nav { border-top: 1px solid var(--line); padding: 0.75rem 0 1rem; background: #fff; }
.mobile-nav ul { list-style: none; margin: 0; padding: 0; }
.mobile-nav a {
  display: block;
  padding: 0.65rem 0;
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px solid var(--line);
}

/* Intro */
.intro {
  display: grid;
  gap: 1rem;
  padding: 1.6rem 0 1rem;
}
@media (min-width: 900px) {
  .intro {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: end;
    padding: 1.8rem 0 1.1rem;
  }
}
.intro h1 {
  margin: 0 0 0.4rem;
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.intro p { margin: 0; color: var(--muted); max-width: 32rem; }
.search-box {
  display: flex;
  gap: 0.45rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.35rem;
}
.search-box input {
  flex: 1;
  border: 0;
  padding: 0.65rem 0.75rem;
  font: inherit;
  min-width: 0;
}
.search-box input:focus { outline: none; }
.search-box .btn { white-space: nowrap; }

/* Topics */
.topic-rail {
  display: flex;
  gap: 0.35rem 0.85rem;
  overflow-x: auto;
  padding: 0.35rem 0 0.85rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 1.1rem;
  -webkit-overflow-scrolling: touch;
}
.topic-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.15rem 0.5rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
}
.topic-chip.is-active {
  border-bottom-color: var(--blue);
  font-weight: 800;
}
.topic-bar {
  width: 4px;
  height: 14px;
  border-radius: 2px;
  display: inline-block;
}

/* Layout */
.layout {
  display: grid;
  gap: 1.4rem;
  padding-bottom: 2rem;
}
@media (min-width: 960px) {
  .layout { grid-template-columns: 1fr 0.38fr; align-items: start; }
}
.feed-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.65rem;
}
.feed-head h2 { margin: 0; font-size: 1.25rem; }
.feed-meta {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.post-list { border-top: 1px solid var(--line); }
.post-row {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 0.85rem;
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--line);
}
.post-row.no-thumb { grid-template-columns: 1fr; }
.post-thumb {
  width: 88px;
  height: 66px;
  border-radius: 8px;
  object-fit: cover;
  background: var(--panel);
}
.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.55rem;
  margin-bottom: 0.25rem;
  font-size: 0.82rem;
  color: var(--muted);
}
.post-meta a { color: var(--muted); text-decoration: none; font-weight: 600; }
.post-meta a:hover { color: var(--orange); }
.topic-label {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-weight: 700;
  color: var(--ink);
}
.post-row h3 {
  margin: 0 0 0.3rem;
  font-size: 1.08rem;
  line-height: 1.3;
}
.post-row h3 a { color: var(--ink); text-decoration: none; }
.post-row h3 a:hover { color: var(--orange); }
.post-excerpt {
  margin: 0 0 0.45rem;
  color: var(--muted);
  font-size: 0.95rem;
}
.source-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-weight: 700;
  font-size: 0.92rem;
  text-decoration: none;
}
.demo-tag {
  display: inline-block;
  padding: 0.1rem 0.4rem;
  border-radius: 999px;
  background: #FFF4EF;
  color: var(--orange);
  font-size: 0.72rem;
  font-weight: 800;
}
.load-more { margin-top: 1rem; }

/* Sidebar */
.sidebar { display: grid; gap: 0.85rem; }
.panel {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.95rem 1rem;
  background: #fff;
}
.panel h3 {
  margin: 0 0 0.7rem;
  font-size: 1rem;
}
.side-list { list-style: none; margin: 0; padding: 0; }
.side-list li { border-top: 1px solid var(--line); }
.side-list li:first-child { border-top: 0; }
.side-list a {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.55rem 0;
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}
.side-list a:hover { color: var(--orange); }
.side-thumb {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: cover;
  background: var(--panel);
  flex-shrink: 0;
}
.panel-cta {
  background: var(--peach);
  border-color: #F0D5C0;
}
.panel-cta p { margin: 0 0 0.75rem; color: var(--ink); }

/* Topics grid */
.section { padding: 1.6rem 0 2rem; }
.section h2 { margin: 0 0 0.9rem; font-size: 1.35rem; }
.topic-cards {
  display: grid;
  gap: 0.75rem;
}
@media (min-width: 700px) {
  .topic-cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.topic-card {
  display: block;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  text-decoration: none;
  color: inherit;
  background: #fff;
  border-top-width: 4px;
}
.topic-card h3 { margin: 0.45rem 0 0.3rem; font-size: 1.05rem; }
.topic-card p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.topic-card .icon { color: var(--ink); }

.cta-band {
  background: var(--peach);
  padding: 2rem 0;
  position: relative;
  overflow: hidden;
}
.cta-band::before,
.cta-band::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 18px;
  background: repeating-linear-gradient(
    90deg,
    #96C8DB 0 4px,
    #56B78A 4px 8px,
    #FFF500 8px 12px,
    #F2AD7B 12px 16px,
    #DF501E 16px 20px
  );
}
.cta-band::before { left: 0; }
.cta-band::after { right: 0; }
.cta-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.cta-inner h2 { margin: 0 0 0.35rem; font-size: 1.45rem; }
.cta-inner p { margin: 0; color: var(--ink); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.6rem 0 2rem;
  background: #fff;
}
.footer-grid {
  display: grid;
  gap: 1rem;
}
@media (min-width: 800px) {
  .footer-grid { grid-template-columns: 1.2fr 1.4fr 1fr; align-items: start; }
}
.footer-brand p { color: var(--muted); margin: 0.45rem 0 0; }
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-nav a { color: var(--ink); text-decoration: none; font-weight: 600; font-size: 0.92rem; }
.footer-note { color: var(--muted); font-size: 0.85rem; margin: 0; }

/* Inner */
.page-hero { padding: 1.4rem 0 0.8rem; }
.page-hero h1 { margin: 0 0 0.35rem; font-size: clamp(1.6rem, 3vw, 2.1rem); }
.page-hero p { margin: 0; color: var(--muted); }
.page-main { padding: 0.5rem 0 2.4rem; }
.page-surface {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem 1.1rem;
  background: #fff;
}
.catalog-grid {
  display: grid;
  gap: 0.75rem;
}
@media (min-width: 700px) {
  .catalog-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
.blog-card {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.85rem;
  text-decoration: none;
  color: inherit;
}
.blog-card:hover { border-color: #ccc; }
.blog-card h3 { margin: 0 0 0.2rem; font-size: 1.05rem; }
.blog-card p { margin: 0; color: var(--muted); font-size: 0.9rem; }
.form-grid { display: grid; gap: 0.75rem; max-width: 36rem; }
.form-grid label { display: grid; gap: 0.3rem; font-weight: 700; }
.form-grid input,
.form-grid textarea,
.form-grid select {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.7rem 0.8rem;
  font: inherit;
}
.form-grid .check { display: flex; gap: 0.5rem; align-items: flex-start; font-weight: 500; }
.notice { padding: 0.7rem 0.85rem; border-radius: 8px; margin-bottom: 0.75rem; }
.notice-ok { background: #E8F6EC; color: #1F5B34; }
.notice-err { background: #FCE8E2; color: #7A2E1A; }
.notice-info { background: #EEF7FB; color: #1E4E63; }
.empty { color: var(--muted); padding: 1rem 0; }

@media (max-width: 699px) {
  .post-row { grid-template-columns: 72px 1fr; gap: 0.7rem; }
  .post-thumb { width: 72px; height: 54px; }
  .nav-tools .btn-outline { display: none; }
}