/* tripwright site: plain CSS, no build step, no external fonts */

:root {
  --bg: #f8f7f3;
  --fg: #1c1e22;
  --muted: #5b616b;
  --panel: #ffffff;
  --panel2: #efede6;
  --line: #d6d2c7;
  --accent: #0e6b66;
  --accent-ink: #ffffff;
  --accent-soft: #dcefec;
  --warn: #9a4d07;
  --warn-soft: #fbecd9;
  --bad: #b3261e;
  --bad-soft: #fbe3e0;
  --ok: #2b6e2f;
  --ok-soft: #e1f0df;
  --chat-user: #0e6b66;
  --chat-user-ink: #ffffff;
  --shadow: 0 1px 2px rgba(0,0,0,.05), 0 4px 16px rgba(0,0,0,.05);
  --radius: 12px;
  --maxw: 1080px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131519;
    --fg: #e7e5e0;
    --muted: #a2a8b2;
    --panel: #1b1e23;
    --panel2: #23272e;
    --line: #363b44;
    --accent: #5fc6bd;
    --accent-ink: #0d1f1d;
    --accent-soft: #17332f;
    --warn: #f2a65e;
    --warn-soft: #3a2a19;
    --bad: #ff8f85;
    --bad-soft: #3d1e1c;
    --ok: #8fcf8f;
    --ok-soft: #1d3320;
    --chat-user: #2b7f79;
    --chat-user-ink: #ffffff;
    --shadow: 0 1px 2px rgba(0,0,0,.4);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
}
code, kbd, .mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .92em; }
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
h1, h2, h3, h4 { line-height: 1.3; margin: 0 0 .5em; }
h1 { font-size: clamp(1.9rem, 4.5vw, 2.9rem); letter-spacing: -.01em; }
h2 { font-size: clamp(1.45rem, 3vw, 1.95rem); }
h3 { font-size: 1.12rem; }
p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; padding-left: 1.3em; }
li { margin: .2em 0; }

/* language switching: content is duplicated per language */
html[data-lang="en"] .zh, html[data-lang="zh"] .en { display: none !important; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 28px; } }

/* header */
.top {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(8px);
  -webkit-backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--line);
}
.top .wrap { display: flex; align-items: center; gap: 14px; height: 56px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--fg); text-decoration: none; font-size: 1.05rem; }
.brand svg { width: 26px; height: 26px; color: var(--accent); }
.nav { display: none; gap: 18px; margin-left: 10px; font-size: .94rem; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover { color: var(--fg); }
@media (min-width: 900px) { .nav { display: flex; } }
.top .spacer { flex: 1; }
.lang {
  display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; background: var(--panel);
}
.lang button {
  border: 0; background: transparent; color: var(--muted); font: inherit; font-size: .88rem;
  padding: 4px 12px; cursor: pointer; min-height: 32px;
}
.lang button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }

/* badges and chips */
.badge {
  display: inline-flex; align-items: center; gap: 6px; font-size: .82rem; font-weight: 600;
  padding: 3px 10px; border-radius: 999px; border: 1px solid var(--line); background: var(--panel); color: var(--muted);
  white-space: nowrap;
}
.badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--warn); }
.chip { display: inline-block; font-size: .78rem; font-weight: 600; padding: 1px 8px; border-radius: 6px; white-space: nowrap; }
.chip.dev { background: var(--warn-soft); color: var(--warn); }
.chip.plan { background: var(--panel2); color: var(--muted); }
.chip.unk { background: var(--bad-soft); color: var(--bad); }
.chip.ok { background: var(--ok-soft); color: var(--ok); }
.chip.acc { background: var(--accent-soft); color: var(--accent); }

/* sections */
section { padding: 56px 0; border-top: 1px solid var(--line); }
section:first-of-type { border-top: 0; }
.kicker { font-size: .82rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); margin-bottom: 6px; }
.lede { font-size: 1.12rem; color: var(--muted); max-width: 46em; }

/* hero */
.hero { padding: 48px 0 40px; }
.hero-grid { display: grid; gap: 32px; }
.hero-grid > * { min-width: 0; }
.hero .badge { max-width: 100%; white-space: normal; }
.hero .badge .dot { flex-shrink: 0; }
@media (min-width: 900px) { .hero-grid { grid-template-columns: 1.1fr .9fr; align-items: center; } }
.hero h1 { margin-top: 12px; }
.hero .pitch { font-size: 1.15rem; max-width: 34em; }
.cta { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0 8px; }
.btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 9px 16px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--panel); color: var(--fg); text-decoration: none; font-weight: 600; font-size: .95rem;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.facts { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 6px; color: var(--muted); font-size: .95rem; }
.facts li::before { content: "— "; color: var(--accent); }

/* cards */
.grid3 { display: grid; gap: 16px; }
@media (min-width: 820px) { .grid3 { grid-template-columns: repeat(3, 1fr); } }
.grid2 { display: grid; gap: 16px; }
@media (min-width: 820px) { .grid2 { grid-template-columns: repeat(2, 1fr); } }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 18px 14px; box-shadow: var(--shadow);
  min-width: 0;
}
.card h3 { margin-bottom: .4em; }
.card .num { display: inline-flex; width: 26px; height: 26px; border-radius: 50%; align-items: center; justify-content: center; background: var(--accent-soft); color: var(--accent); font-weight: 700; font-size: .9rem; margin-bottom: 8px; }
.card .eg { background: var(--panel2); border-radius: 8px; padding: 10px 12px; font-size: .93rem; margin: 10px 0; }
.card .eg b { font-weight: 600; }
.card .fix { font-size: .93rem; color: var(--muted); margin: 0; }
.card .fix strong { color: var(--accent); }

/* mechanism blocks */
.mech { display: grid; gap: 24px; padding: 28px 0; border-top: 1px dashed var(--line); }
.mech:first-of-type { border-top: 0; }
@media (min-width: 900px) { .mech { grid-template-columns: .9fr 1.1fr; align-items: start; gap: 40px; } }
.mech .text h3 { font-size: 1.3rem; }
.mech .text ul { padding-left: 1.1em; }
figure { margin: 0; }
figure.diagram {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 10px 10px; box-shadow: var(--shadow);
}
figure.diagram svg { display: block; width: 100%; max-width: 560px; height: auto; margin: 0 auto; color: var(--fg); }
@media (max-width: 600px) {
  figure.diagram { margin: 0 -16px; border-radius: 0; border-left: 0; border-right: 0; padding: 12px 4px 8px; }
  figure.diagram figcaption { padding: 10px 12px 2px; }
}
figcaption { font-size: .88rem; color: var(--muted); padding: 10px 6px 2px; }

/* svg classes (styled from page CSS so both themes work) */
.s-box { fill: var(--panel); stroke: var(--line); stroke-width: 1.2; }
.s-soft { fill: var(--panel2); stroke: none; }
.s-band { fill: var(--panel2); stroke: none; }
.s-acc { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1.4; }
.s-warn { fill: var(--warn-soft); stroke: var(--warn); stroke-width: 1.2; }
.s-bad { fill: var(--bad-soft); stroke: var(--bad); stroke-width: 1.2; }
.s-ok { fill: var(--ok-soft); stroke: var(--ok); stroke-width: 1.2; }
.s-user { fill: var(--chat-user); stroke: none; }
.s-t { fill: var(--fg); font-size: 13px; }
.s-tb { fill: var(--fg); font-size: 13px; font-weight: 700; }
.s-h { fill: var(--accent); font-size: 14px; font-weight: 800; letter-spacing: .04em; }
.s-m { fill: var(--muted); font-size: 11.5px; }
.s-s { fill: var(--muted); font-size: 10.5px; }
.s-ut { fill: var(--chat-user-ink); font-size: 13px; }
.s-at { fill: var(--accent); font-size: 12px; font-weight: 600; }
.s-wt { fill: var(--warn); font-size: 12px; font-weight: 600; }
.s-bt { fill: var(--bad); font-size: 12px; font-weight: 600; }
.s-ot { fill: var(--ok); font-size: 12px; font-weight: 600; }
.s-line { stroke: var(--muted); stroke-width: 1.4; fill: none; }
.s-line-acc { stroke: var(--accent); stroke-width: 1.8; fill: none; }
.s-line-bad { stroke: var(--bad); stroke-width: 1.6; fill: none; }
.s-dash { stroke-dasharray: 5 4; }
.s-axis { stroke: var(--line); stroke-width: 1.2; }
.m-fill { fill: var(--muted); }
.m-acc { fill: var(--accent); }
.m-bad { fill: var(--bad); }

/* features list */
.feat { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
@media (min-width: 720px) { .feat { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .feat { grid-template-columns: repeat(3, 1fr); } }
.feat li { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; margin: 0; }
.feat li b { display: block; margin-bottom: 2px; }
.feat li span.d { color: var(--muted); font-size: .93rem; }

/* demo */
.trip-strip { display: grid; gap: 8px; grid-template-columns: repeat(2, 1fr); margin: 18px 0 26px; }
@media (min-width: 720px) { .trip-strip { grid-template-columns: repeat(4, 1fr); } }
.trip-strip div { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; font-size: .9rem; }
.trip-strip div.on { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; }
.trip-strip b { display: block; }
.trip-strip span { color: var(--muted); }

.demo-grid { display: grid; gap: 24px; }
@media (min-width: 980px) { .demo-grid { grid-template-columns: 1fr 1fr; align-items: start; } }

.phone {
  background: var(--panel); border: 1px solid var(--line); border-radius: 22px; padding: 14px; box-shadow: var(--shadow);
  max-width: 520px; width: 100%; margin: 0 auto;
}
.phone .bar { display: flex; justify-content: space-between; font-size: .78rem; color: var(--muted); padding: 0 4px 10px; border-bottom: 1px solid var(--line); margin-bottom: 12px; }
.msg { margin: 0 0 14px; }
.msg .who { font-size: .76rem; color: var(--muted); margin: 0 4px 3px; }
.msg.user { text-align: right; }
.msg.user .bubble { display: inline-block; background: var(--chat-user); color: var(--chat-user-ink); border-radius: 16px 16px 4px 16px; padding: 8px 14px; text-align: left; }
.msg.bot .bubble { background: var(--panel2); border-radius: 16px 16px 16px 4px; padding: 12px 14px; font-size: .95rem; }
.bubble h4 { font-size: 1.05rem; margin: 0 0 .4em; padding-bottom: 4px; border-bottom: 2px solid var(--accent); display: inline-block; }
.bubble .part2 { border-bottom-color: var(--ok); }
.bubble ul { padding-left: 1.1em; margin-bottom: .6em; }
.bubble li { margin: .15em 0; }
.bubble .tag { font-size: .8rem; font-weight: 700; color: var(--muted); margin: .7em 0 .2em; letter-spacing: .02em; }
.bubble .used { border-left: 3px solid var(--accent); padding-left: 10px; margin: .6em 0; }
.bubble .traded { border-left: 3px solid var(--warn); padding-left: 10px; margin: .6em 0; }
.bubble .pending { border-left: 3px solid var(--line); padding-left: 10px; margin: .6em 0; }
.bubble q { quotes: "“" "”"; }
.place { white-space: nowrap; }

/* day view */
.dayview { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.dayview header { padding: 14px 16px; border-bottom: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 6px 12px; align-items: baseline; }
.dayview header h3 { margin: 0; }
.dayview header .meta { font-size: .8rem; color: var(--muted); }
.dv-sec { padding: 14px 16px; border-bottom: 1px solid var(--line); }
.dv-sec:last-child { border-bottom: 0; }
.dv-sec h4 { font-size: .85rem; letter-spacing: .03em; color: var(--muted); margin: 0 0 8px; }
.hard { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
.hard li { display: grid; grid-template-columns: 56px 1fr; gap: 10px; align-items: baseline; margin: 0; }
.hard .t { font-weight: 800; color: var(--bad); font-variant-numeric: tabular-nums; }
.tl { list-style: none; padding: 0; margin: 0; position: relative; }
.tl::before { content: ""; position: absolute; left: 60px; top: 6px; bottom: 6px; width: 2px; background: var(--line); }
.tl li { display: grid; grid-template-columns: 48px 1fr; gap: 28px; margin: 0 0 10px; position: relative; }
.tl li::after { content: ""; position: absolute; left: 55px; top: 8px; width: 10px; height: 10px; border-radius: 50%; background: var(--panel); border: 2px solid var(--accent); }
.tl li.hardpt::after { border-color: var(--bad); background: var(--bad); }
.tl .t { font-variant-numeric: tabular-nums; font-weight: 700; font-size: .92rem; }
.tl .what { font-size: .95rem; }
.tl .how { display: block; color: var(--muted); font-size: .86rem; }
.places { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.places li { display: flex; gap: 10px; align-items: flex-start; margin: 0; }
.places .pn { flex: 1; min-width: 0; }
.places .pn code { display: inline-block; background: var(--panel2); padding: 1px 6px; border-radius: 5px; word-break: break-word; }
.places .pn span { display: block; color: var(--muted); font-size: .86rem; }
.copy {
  flex: none; border: 1px solid var(--line); background: var(--panel); color: var(--muted); border-radius: 7px; font: inherit; font-size: .8rem;
  padding: 3px 10px; cursor: pointer; min-height: 30px;
}
.copy.done { color: var(--ok); border-color: var(--ok); }
.checks { list-style: none; padding: 0; margin: 0; display: grid; gap: 4px; font-size: .92rem; }
.checks li { margin: 0; }

/* where-to-use */
.hosts { display: grid; gap: 12px; }
@media (min-width: 760px) { .hosts { grid-template-columns: repeat(2, 1fr); } }
.host { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; min-width: 0; }
.host .hd { display: flex; flex-wrap: wrap; gap: 6px 10px; align-items: center; margin-bottom: 4px; }
.host .hd b { font-size: 1.02rem; }
.host p { margin: 0; font-size: .92rem; color: var(--muted); }
.legend { display: flex; flex-wrap: wrap; gap: 8px 16px; margin: 0 0 16px; font-size: .9rem; color: var(--muted); }

/* misc */
.note { font-size: .88rem; color: var(--muted); }
.callout { border-left: 3px solid var(--accent); background: var(--panel); padding: 12px 16px; border-radius: 0 10px 10px 0; margin: 16px 0; }
.placeholder { border: 1px dashed var(--line); border-radius: 10px; padding: 16px; background: var(--panel); }
.placeholder pre { margin: 8px 0 0; background: var(--panel2); padding: 10px 12px; border-radius: 8px; overflow-x: auto; font-size: .88rem; }
footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: .9rem; }
footer .wrap { display: grid; gap: 6px; }

/* message-to-plan flow */
.flow { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 12px; }
.flow li { min-width: 0; margin: 0; padding: 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.flow .num { display: block; margin-bottom: 10px; color: var(--accent); font-weight: 800; font-variant-numeric: tabular-nums; }
.flow p { margin: 0; color: var(--muted); font-size: .94rem; }
@media (min-width: 640px) { .flow { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .flow { grid-template-columns: repeat(4, 1fr); } }
#where code { overflow-wrap: anywhere; }

/* method page */
.wrap.prose > * { max-width: 46em; }
.wrap.prose > .analog { max-width: none; }
.prose h2 { margin-top: 1.6em; }
.prose .kicker + h2 { margin-top: 0; }
.analog { display: grid; gap: 12px; margin: 16px 0; }
@media (min-width: 820px) { .analog { grid-template-columns: repeat(3, 1fr); } }
.attrs { columns: 2; column-gap: 28px; }
@media (max-width: 560px) { .attrs { columns: 1; } }
.attrs li { break-inside: avoid; }

/* visually hidden */
.vh { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }