:root {
  --bg: #f8fafc;
  --card: #ffffff;
  --ink: #0f172a;
  --mut: #475569;
  --line: #e2e8f0;
  --red: #b91c1c;
  --redbg: #fef2f2;
  --blue: #1d4ed8;
  --greenbg: #dcfce7;
  --greenline: #bbf7d0;
  --header-bg: #ffffff;
  --header-ink: #0f172a;
  --header-line: #e2e8f0;
  --header-shadow: 0 1px 4px rgba(15, 23, 42, 0.06);
  --pill-bg: #f1f5f9;
  --pill-line: #e2e8f0;
  --cta-bg: #0f172a;
  --cta-ink: #ffffff;
  --nav-ink: #e2e8f0;
  --input-bg: #ffffff;
  --btn-bg: #ffffff;
  --btn-ink: #0f172a;
  --chip-bg: #ffffff;
  --tag-bg: #eff6ff;
  --tag-line: #dbeafe;
  --chat-bg: #f1f5f9;
  --bubble-bg: #ffffff;
  --warn-line: #fecaca;
  --focus: #2563eb;
  color-scheme: light;
}
[data-theme="dark"] {
  --bg: #0b1220;
  --card: #111a2e;
  --ink: #e2e8f0;
  --mut: #94a3b8;
  --line: #243047;
  --red: #f87171;
  --redbg: #2a1418;
  --blue: #93c5fd;
  --greenbg: #123524;
  --greenline: #1e4d33;
  --header-bg: #111a2e;
  --header-ink: #e2e8f0;
  --header-line: #243047;
  --header-shadow: 0 1px 4px rgba(0, 0, 0, 0.35);
  --pill-bg: #1a2438;
  --pill-line: #243047;
  --cta-bg: #e2e8f0;
  --cta-ink: #0f172a;
  --nav-ink: #cbd5e1;
  --input-bg: #1a2438;
  --btn-bg: #243047;
  --btn-ink: #e2e8f0;
  --chip-bg: #1a2438;
  --tag-bg: #16233d;
  --tag-line: #243047;
  --chat-bg: #162032;
  --bubble-bg: #1a2438;
  --warn-line: #7f1d1d;
  --focus: #93c5fd;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  font-size: 17px;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}
header { background: var(--header-bg); color: var(--header-ink); position: sticky; top: 0; z-index: 10; border-bottom: 1px solid var(--header-line); box-shadow: var(--header-shadow); }
.header-wrap { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; padding-top: 10px; padding-bottom: 10px; }
.header-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; width: 100%; }
header a.logo { color: var(--header-ink); font-weight: 700; font-size: 18px; display: inline-flex; align-items: center; gap: 8px; }
header a.logo:hover { text-decoration: none; }
.logo-icon { font-size: 20px; line-height: 1; }
header nav { display: flex; gap: 14px; flex-wrap: wrap; }
header nav a { color: var(--nav-ink); font-size: 15px; }
.search-form { display: flex; align-items: center; gap: 0; flex: 1 1 260px; background: var(--pill-bg); border: 1px solid var(--pill-line); border-radius: 999px; padding: 4px 4px 4px 14px; }
.search-form input[type="search"] {
  flex: 1;
  min-width: 0;
  padding: 8px 4px;
  border: 0;
  border-radius: 0;
  font-size: 16px;
  background: transparent;
  color: var(--ink);
}
.search-form button {
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  font-size: 16px;
  line-height: 1;
  background: var(--cta-bg);
  color: var(--cta-ink);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.theme-toggle {
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--header-line);
  border-radius: 50%;
  font-size: 17px;
  line-height: 1;
  background: transparent;
  color: var(--header-ink);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
@media (min-width: 768px) {
  .header-wrap { flex-wrap: nowrap; }
  .header-top { width: auto; flex: 0 0 auto; }
  .search-form { flex: 1 1 auto; min-width: 0; }
}
.wrap { max-width: 900px; margin: 0 auto; padding: 16px; }
.hero { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 22px; }
.hero h1 { margin: 0 0 8px; font-size: 28px; line-height: 1.3; }
.hero-banner { display: block; width: 100%; height: auto; border-radius: 12px; margin-bottom: 16px; }
[data-theme="dark"] .hero-banner { filter: none; }
.hero p { color: var(--mut); margin: 10px 0; }
.hero .search-form { margin: 14px 0; }
.hero-link { font-size: 16px; }
.warn { background: var(--redbg); border: 1px solid var(--warn-line); border-radius: 12px; padding: 14px 16px; margin: 16px 0; }
.warn strong { color: var(--red); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px; margin: 14px 0; }
.grid { display: grid; grid-template-columns: 1fr; gap: 12px; }
@media (min-width: 640px) {
  .grid { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 30px; }
}
.chip { display: inline-block; border: 1px solid var(--line); background: var(--chip-bg); border-radius: 999px; padding: 4px 10px; margin: 3px; font-size: 14px; }
.tag { display: inline-block; background: var(--tag-bg); border: 1px solid var(--tag-line); border-radius: 999px; padding: 3px 9px; margin: 3px; font-size: 13px; }
input[type="search"], select { width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 12px; font-size: 16px; background: var(--input-bg); color: var(--ink); }
.search-form input[type="search"] { width: auto; }
.result { border-top: 1px solid var(--line); padding: 12px 0; }
.result:first-child { border-top: 0; }
.result h3 { margin: 0; font-size: 17px; }
.result p { margin: 4px 0; color: var(--mut); font-size: 15px; }
.meta { color: var(--mut); font-size: 14px; }
h2 { font-size: 22px; margin: 22px 0 8px; line-height: 1.4; }
h3 { font-size: 18px; line-height: 1.4; }
.chat { background: var(--chat-bg); border: 1px solid var(--line); border-radius: 14px; padding: 14px; display: flex; flex-direction: column; gap: 10px; }
.msg { max-width: 88%; display: flex; flex-direction: column; }
.msg.left { align-self: flex-start; }
.msg.right { align-self: flex-end; text-align: right; }
.who { font-size: 12px; color: var(--mut); margin: 0 4px 2px; }
.bubble { display: inline-block; padding: 9px 12px; border-radius: 14px; background: var(--bubble-bg); border: 1px solid var(--line); text-align: left; color: var(--ink); }
.msg.right .bubble { background: var(--greenbg); border-color: var(--greenline); }
.note { color: var(--mut); font-size: 14px; }
footer { color: var(--mut); font-size: 14px; text-align: center; padding: 24px 16px; line-height: 1.6; }
.breadcrumb { font-size: 14px; color: var(--mut); }
ul { padding-left: 20px; }
li { margin: 5px 0; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0; }
.action-btn { padding: 8px 12px; border: 1px solid var(--line); border-radius: 999px; background: var(--chip-bg); color: var(--ink); cursor: pointer; font-size: 14px; }
.action-btn[aria-pressed="true"] { background: var(--tag-bg); border-color: var(--tag-line); font-weight: 700; }
.like-count { color: var(--mut); font-size: 14px; margin-left: 4px; }
.status-icon { font-size: 13px; margin-left: 6px; padding: 2px 7px; border-radius: 999px; border: 1px solid var(--line); background: var(--chip-bg); color: var(--mut); white-space: nowrap; }
.status-new { color: var(--red); border-color: var(--warn-line); background: var(--redbg); }
.chat-title { font-size: 17px; margin: 18px 0 8px; }
.chat + .chat-title { margin-top: 20px; }
.btn { display: inline-block; padding: 12px 18px; border-radius: 12px; background: var(--cta-bg); color: var(--cta-ink); font-weight: 700; }
.hero-chips { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 14px 0 0; }
.hero-chips .chip { margin: 0; }
.hero-chips a:hover { text-decoration: none; }
.btn:hover { text-decoration: none; }
.submit-link { margin-top: 20px; }
html[data-font-step="-1"] body { font-size: 15px; }
html[data-font-step="1"] body { font-size: 19px; }
html[data-font-step="2"] body { font-size: 21px; }