/* ============ 看见科学 · 交互科学工具集 ============ */
:root {
  --bg: #eef2f7;
  --panel: #ffffff;
  --panel2: #f5f8fb;
  --line: rgba(30, 80, 140, 0.14);
  --line2: rgba(30, 80, 140, 0.3);
  --text: #12202f;
  --muted: #5b6b7d;
  --dim: #97a4b3;
  --cyan: #0092c7;
  --amber: #c9800f;
  --green: #0f9e63;
  --red: #d1372c;
  --mag: #c43aa0;
  --font: "Chakra Petch", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
  --cut: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: var(--bg); color: var(--text); font-family: var(--font); -webkit-font-smoothing: antialiased; }
body {
  background:
    radial-gradient(1200px 600px at 50% -10%, rgba(40, 120, 200, 0.1), transparent 60%),
    linear-gradient(rgba(30, 80, 140, 0.05) 1px, transparent 1px) 0 0 / 100% 24px,
    linear-gradient(90deg, rgba(30, 80, 140, 0.05) 1px, transparent 1px) 0 0 / 24px 100%,
    var(--bg);
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }

/* ---------- header ---------- */
header { border-bottom: 1px solid var(--line); background: rgba(255, 255, 255, 0.75); -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); position: sticky; top: 0; z-index: 5; }
header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; height: 64px; }
.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand > div { min-width: 0; }
.brand svg { width: 36px; height: 36px; filter: drop-shadow(0 0 8px rgba(0, 146, 199, 0.3)); }
.brand b { display: block; font-size: 19px; letter-spacing: 0.2em; font-weight: 700; line-height: 1; }
.brand b i { font-style: normal; color: var(--cyan); text-shadow: 0 0 10px rgba(0, 146, 199, 0.3); }
.brand span { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-family: var(--mono); font-size: 9.5px; color: var(--muted); letter-spacing: 0.18em; margin-top: 5px; }
.header-tools { display: flex; align-items: center; gap: 18px; margin-left: auto; flex-shrink: 0; }
.stat { font-family: var(--mono); font-size: 11px; color: var(--muted); letter-spacing: 0.12em; display: flex; align-items: center; gap: 8px; }
.stat::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 8px var(--green); }

/* ---------- hero ---------- */
.hero { padding: 34px 0 36px; }
.eyebrow { font-family: var(--mono); font-size: 11px; letter-spacing: 0.3em; color: var(--cyan); }
.hero h1 { font-size: clamp(30px, 5vw, 48px); line-height: 1.15; margin: 14px 0; font-weight: 700; letter-spacing: 0.04em; }
.hero h1 em { font-style: normal; color: var(--cyan); text-shadow: 0 0 14px rgba(0, 146, 199, 0.25); }
.hero p { max-width: 620px; color: var(--muted); font-size: 15px; line-height: 1.75; margin: 0; }
.hero { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.social-shortcut { flex-shrink: 0; font-size: 13px; color: var(--cyan); padding: 8px 0; }
.social-shortcut:hover { text-decoration: underline; text-underline-offset: 4px; }

/* ---------- filters ---------- */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 22px; }
.chip { height: 32px; padding: 0 14px; border: 1px solid var(--line2); background: rgba(255, 255, 255, 0.7); color: var(--muted); font-size: 13px; letter-spacing: 0.08em; cursor: pointer; clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px); transition: 0.15s; }
.chip { --sc: var(--cyan); }
.chip i { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--sc); box-shadow: 0 0 6px var(--sc); margin-right: 7px; vertical-align: 1px; }
.chip:hover { color: var(--text); border-color: var(--sc); }
.chip[aria-pressed="true"] { color: #03101a; background: var(--sc); border-color: var(--sc); font-weight: 600; }
.chip[aria-pressed="true"] i { background: #03101a; box-shadow: none; }
.chip small { font-family: var(--mono); opacity: 0.7; margin-left: 6px; }

/* ---------- grid & cards ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(320px, 100%), 1fr)); gap: 20px; padding-bottom: 64px; }
.card { --cc: var(--cyan); position: relative; display: flex; flex-direction: column; background: linear-gradient(180deg, #fff, #f6f9fc); border: 1px solid var(--line2); clip-path: var(--cut); box-shadow: 0 1px 3px rgba(20, 50, 90, 0.06); transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s; }
a.card:hover { transform: translateY(-3px); border-color: var(--cc); box-shadow: 0 14px 36px -14px var(--cc); }
a.card:focus-visible { outline: 2px solid var(--cc); outline-offset: 2px; }
.card .pv { height: 170px; border-bottom: 1px solid var(--line); position: relative; overflow: hidden; background: radial-gradient(260px 140px at 50% 60%, color-mix(in srgb, var(--cc) 10%, transparent), transparent 70%), linear-gradient(rgba(30, 80, 140, 0.05) 1px, transparent 1px) 0 0 / 100% 16px, linear-gradient(90deg, rgba(30, 80, 140, 0.05) 1px, transparent 1px) 0 0 / 16px 100%, #fbfcfe; }
.card .pv svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.card .glyph { position: absolute; inset: 0; display: grid; place-items: center; font-size: 56px; font-weight: 700; letter-spacing: 0.2em; color: var(--cc); opacity: 0.22; text-shadow: 0 0 30px var(--cc); }
.card .tag { position: absolute; top: 12px; left: 14px; font-family: var(--mono); font-size: 10px; letter-spacing: 0.2em; color: var(--cc); border: 1px solid color-mix(in srgb, var(--cc) 50%, transparent); padding: 3px 7px; background: rgba(255, 255, 255, 0.8); }
.card .body { padding: 18px 20px 20px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.card h3 { margin: 0; font-size: 20px; letter-spacing: 0.06em; display: flex; align-items: baseline; gap: 10px; }
.card h3 span { font-family: var(--mono); font-size: 10.5px; color: var(--muted); letter-spacing: 0.14em; font-weight: 400; }
.card p { margin: 0; color: var(--muted); font-size: 13.5px; line-height: 1.7; }
.card ul { list-style: none; padding: 0; margin: 2px 0 0; display: flex; flex-wrap: wrap; gap: 6px; }
.card li { font-size: 11.5px; color: var(--text); background: rgba(30, 80, 140, 0.06); border: 1px solid var(--line); padding: 3px 8px; }
.card .go { margin-top: auto; padding-top: 8px; display: flex; align-items: center; justify-content: space-between; font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em; color: var(--dim); }
.card .go b { color: var(--cc); font-weight: 600; transition: letter-spacing 0.2s; }
a.card:hover .go b { letter-spacing: 0.28em; }
.card.soon { border-style: dashed; border-color: var(--line2); background: rgba(240, 244, 248, 0.7); --cc: var(--dim); }
.card.soon .pv { display: grid; place-items: center; color: var(--dim); font-family: var(--mono); font-size: 28px; }
.empty { grid-column: 1 / -1; color: var(--muted); text-align: center; padding: 40px 0; border: 1px dashed var(--line2); }
.tools-more { grid-column: 1 / -1; text-align: center; padding-top: 8px; }
.tools-more button { padding: 12px 32px; border: 1px solid var(--line2); background: var(--panel); color: var(--cyan); font-size: 14px; cursor: pointer; transition: border-color 0.2s, background 0.2s; }
.tools-more button:hover { border-color: var(--cyan); background: var(--panel2); }
.tools-more button:focus-visible { outline: 2px solid var(--cyan); outline-offset: 4px; }

/* ---------- social section ---------- */
.social-section { scroll-margin-top: 88px; display: grid; grid-template-columns: minmax(240px, 1fr) repeat(2, minmax(200px, 240px)); gap: 28px; align-items: center; margin-bottom: 48px; padding: 32px; background: var(--panel); border: 1px solid var(--line2); border-top: 3px solid var(--cyan); }
.social-intro h2 { margin: 12px 0; font-size: 26px; letter-spacing: 0.06em; }
.social-intro p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.75; }
.social-x { display: flex; align-items: center; gap: 14px; max-width: 260px; margin-top: 24px; padding: 14px 16px; border: 1px solid var(--line); background: var(--panel2); transition: border-color 0.2s; }
.social-x:hover { border-color: var(--cyan); }
.social-x-mark { font-size: 28px; line-height: 1; }
.social-x strong { display: block; font-size: 14px; }
.social-x small { display: block; margin-top: 4px; font-family: var(--mono); font-size: 12px; color: var(--muted); }
.social-arrow { margin-left: auto; color: var(--cyan); }
.social-qr { margin: 0; text-align: center; }
.social-qr a { display: inline-block; padding: 8px; background: #fff; border: 1px solid var(--line); }
.social-qr a:hover { border-color: var(--cyan); }
.social-qr img { display: block; width: 180px; height: 180px; object-fit: contain; }
.social-qr h3 { margin: 12px 0 6px; font-size: 15px; }
.social-qr p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.6; }
.social-shortcut:focus-visible, .social-section a:focus-visible { outline: 2px solid var(--cyan); outline-offset: 4px; }
.social-sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
@media (max-width: 900px) { .social-section { grid-template-columns: repeat(2, minmax(0, 1fr)); } .social-intro { grid-column: 1 / -1; } }
@media (max-width: 480px) { .hero { align-items: flex-start; flex-direction: column; gap: 12px; } .social-section { grid-template-columns: 1fr; padding: 24px; gap: 28px; } }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--line); color: var(--dim); font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em; }
footer .wrap { padding-top: 20px; padding-bottom: 28px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
@media (max-width: 640px) { .wrap { padding: 0 16px; } .hero { padding: 40px 0 28px; } .stat { display: none; } .grid { grid-template-columns: 1fr; } }

/* ---------- language switcher ---------- */
.language-switcher { position: relative; display: inline-flex; flex-shrink: 0; font-family: var(--font, sans-serif); }
.language-switcher > button { display: inline-flex; align-items: center; gap: 6px; height: 32px; padding: 0 9px 0 8px; border: 1px solid var(--line2, rgba(130, 160, 190, 0.4)); border-radius: 6px; background: var(--panel, #fff); color: var(--text, #12202f); font: inherit; font-size: 13px; line-height: 1; white-space: nowrap; cursor: pointer; }
.language-switcher > button:hover, .language-switcher.is-open > button { border-color: var(--cyan, #0092c7); }
.language-switcher > button:focus-visible { outline: 2px solid var(--cyan, #0092c7); outline-offset: 2px; }
.language-globe, .language-chevron, .language-menu svg { fill: none; stroke: currentColor; stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; }
.language-globe { width: 15px; height: 15px; flex: none; color: var(--cyan, #0092c7); }
.language-chevron { width: 12px; height: 12px; flex: none; color: var(--muted, #627286); transition: transform 0.15s ease; }
.language-switcher.is-open .language-chevron { transform: rotate(180deg); }
.language-menu { position: absolute; top: calc(100% + 6px); right: 0; z-index: 80; margin: 0; padding: 5px; list-style: none; border: 1px solid var(--line2, rgba(130, 160, 190, 0.4)); border-radius: 8px; background: var(--panel, #fff); color: var(--text, #12202f); box-shadow: 0 14px 36px rgba(8, 16, 28, 0.2); font-family: var(--font, sans-serif); animation: language-menu-in 0.14s ease; }
.language-menu li { margin: 0; }
.language-menu button { display: flex; align-items: center; justify-content: space-between; gap: 18px; width: 100%; padding: 8px 10px; border: 0; border-radius: 5px; background: transparent; color: inherit; font: inherit; font-size: 14px; line-height: 1.3; text-align: left; cursor: pointer; }
.language-menu button[data-active="true"] { background: color-mix(in srgb, var(--cyan, #0092c7) 16%, transparent); }
.language-menu button[aria-selected="true"] { font-weight: 600; }
.language-menu:focus { outline: none; }
.language-menu svg { width: 14px; height: 14px; flex: none; color: var(--cyan, #0092c7); opacity: 0; }
.language-menu button[aria-selected="true"] svg { opacity: 1; }
.language-menu button:focus { outline: none; }
@keyframes language-menu-in { from { opacity: 0; transform: translateY(-4px); } }

/* ---------- feedback ---------- */
.feedback-trigger { position: fixed; right: max(16px, env(safe-area-inset-right)); bottom: max(12px, env(safe-area-inset-bottom)); z-index: 10000; border: 1px solid #c5d4df; border-radius: 20px; padding: 8px 14px; background: #fff; color: #35566b; font: 13px/1.4 system-ui, sans-serif; cursor: pointer; box-shadow: 0 2px 10px rgba(16, 32, 48, 0.08); }
.feedback-trigger:hover { border-color: var(--cyan); color: var(--cyan); }
.feedback-backdrop { position: fixed; inset: 0; z-index: 10001; background: rgba(7, 21, 34, 0.53); display: grid; place-items: center; padding: 16px; }
.feedback-backdrop[hidden] { display: none; }
.feedback-dialog { box-sizing: border-box; width: min(480px, 100%); max-height: calc(100dvh - 32px); overflow: auto; padding: 24px; border: 1px solid #c5d4df; border-radius: 12px; background: #fff; color: #182c3b; font: 14px/1.6 system-ui, sans-serif; letter-spacing: normal; box-shadow: 0 20px 80px rgba(0, 0, 0, 0.2); }
.feedback-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 12px; }
.feedback-heading h2 { font: 600 21px/1.4 system-ui, sans-serif; margin: 0; color: #182c3b; }
.feedback-heading button { border: 0; background: transparent; color: #526675; font: 26px/1 system-ui; padding: 8px; cursor: pointer; }
.feedback-dialog label { display: block; margin: 14px 0; color: #182c3b; font: 500 14px/1.6 system-ui, sans-serif; }
.feedback-dialog input, .feedback-dialog textarea, .feedback-dialog select { box-sizing: border-box; display: block; width: 100%; height: auto; margin-top: 6px; padding: 10px; border: 1px solid #bdcbd5; border-radius: 6px; background: #fff; color: #182c3b; font: 400 14px/1.6 system-ui, sans-serif; letter-spacing: normal; }
.feedback-dialog textarea { resize: vertical; min-height: 120px; }
.feedback-dialog .feedback-hint { color: #5b6b7d; font-size: 12px; margin: 8px 0; }
.feedback-dialog .feedback-error { color: #b42318; }
.feedback-dialog .feedback-submit { width: 100%; border: 0; border-radius: 6px; padding: 11px; background: #007fae; color: #fff; font: 600 14px/1.5 system-ui, sans-serif; cursor: pointer; }
.feedback-dialog .feedback-submit:disabled { opacity: 0.6; cursor: wait; }
.feedback-dialog button:disabled { opacity: 0.6; cursor: wait; }
.feedback-success { text-align: center; padding: 12px 0; }
.feedback-success p { color: #0f9e63; font-weight: 600; }
.feedback-success .feedback-id { font-family: var(--mono); color: #5b6b7d; font-size: 13px; }
.feedback-success button { margin-top: 16px; padding: 10px 28px; border: 1px solid #bdcbd5; border-radius: 6px; background: #fff; color: #182c3b; font: 500 14px/1.5 system-ui; cursor: pointer; }
.feedback-trigger:focus-visible, .feedback-dialog :is(button, input, textarea, select):focus-visible { outline: 2px solid #0092c7; outline-offset: 3px; }

/* ---------- lab page ---------- */
.lab-back { display: inline-flex; align-items: center; gap: 8px; margin: 28px 0 20px; font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em; color: var(--muted); }
.lab-back:hover { color: var(--cyan); }
.lab-hero { background: var(--panel); border: 1px solid var(--line2); border-top: 3px solid var(--cc, var(--cyan)); margin-bottom: 48px; }
.lab-hero .pv { height: min(46vw, 420px); position: relative; overflow: hidden; border-bottom: 1px solid var(--line); background: radial-gradient(600px 300px at 50% 60%, color-mix(in srgb, var(--cc, var(--cyan)) 10%, transparent), transparent 70%), linear-gradient(rgba(30, 80, 140, 0.05) 1px, transparent 1px) 0 0 / 100% 24px, linear-gradient(90deg, rgba(30, 80, 140, 0.05) 1px, transparent 1px) 0 0 / 24px 100%, #fbfcfe; }
.lab-hero .pv svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.lab-hero .body { padding: 28px 32px 32px; }
.lab-hero h1 { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; margin: 0 0 6px; font-size: clamp(24px, 4vw, 34px); letter-spacing: 0.04em; }
.lab-hero h1 span { font-family: var(--mono); font-size: 12px; color: var(--muted); letter-spacing: 0.16em; font-weight: 400; }
.lab-hero .lab-status { display: inline-flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.2em; color: var(--green); margin-bottom: 14px; }
.lab-hero .lab-status::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 8px var(--green); }
.lab-hero p.desc { color: var(--muted); font-size: 15px; line-height: 1.8; max-width: 720px; margin: 0 0 18px; }
.lab-hero ul { list-style: none; padding: 0; margin: 0 0 22px; display: flex; flex-wrap: wrap; gap: 8px; }
.lab-hero li { font-size: 12.5px; color: var(--text); background: rgba(30, 80, 140, 0.06); border: 1px solid var(--line); padding: 4px 10px; }
.lab-note { display: flex; align-items: center; gap: 10px; padding: 12px 16px; border: 1px dashed var(--line2); background: var(--panel2); color: var(--muted); font-size: 13px; }
.lab-note::before { content: "◈"; color: var(--cyan); }
.lab-enter { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 18px; min-height: 60vh; color: var(--muted); font-family: var(--mono); font-size: 13px; letter-spacing: .2em; }
.lab-enter-spin { width: 34px; height: 34px; border: 2px solid var(--line2); border-top-color: var(--cyan); border-radius: 50%; animation: lab-spin .8s linear infinite; }
@keyframes lab-spin { to { transform: rotate(360deg); } }
.lab-cta { display: inline-flex; align-items: center; gap: 8px; margin-top: 20px; padding: 12px 26px; border: 1px solid var(--cyan); background: var(--cyan); color: #fff; font-size: 14px; letter-spacing: 0.08em; transition: filter 0.2s; }
.lab-cta:hover { filter: brightness(1.08); }
.lab-404 { text-align: center; padding: 80px 24px 120px; color: var(--muted); }
.lab-404 h1 { font-size: 28px; color: var(--text); margin: 0 0 12px; }
@media (max-width: 640px) { .lab-hero .body { padding: 20px 18px 24px; } }