/* =========================================================
   YIWU SULY IMPORT AND EXPORT CO., LIMITED – landing page
   Plum & mauve · developer style · floating capsule nav · bento grid
   ========================================================= */
:root {
    --plum: #533738;
    --plum-900: #2E1D1E;
    --plum-800: #3D2729;
    --plum-600: #6B4A4B;
    --mauve: #B9AEAE;
    --mauve-200: #DDD5D4;
    --mauve-100: #EEE9E8;
    --cream: #F8F5F4;
    --gray: #545454;
    --muted: #6E6464;
    --ink: #221718;
    --amber: #E3A973;
    --mint: #8FD3B6;
    --line: #E2DAD9;
    --r: 22px;
    --r-lg: 32px;
    --sans: 'Sora', 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
    --mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Consolas, monospace;
}
html:lang(zh-Hans) { --sans: 'Noto Sans SC', 'Sora', system-ui, sans-serif; }

html { scroll-behavior: smooth; overflow-x: clip; }
body { font-family: var(--sans); color: var(--ink); background: var(--cream); font-size: 16px; line-height: 1.7; -webkit-font-smoothing: antialiased; overflow-x: clip; }
h1, h2, h3, h4, h5 { font-family: var(--sans); font-weight: 700; color: var(--ink); letter-spacing: -.025em; }
html:lang(zh-Hans) h1, html:lang(zh-Hans) h2, html:lang(zh-Hans) h3, html:lang(zh-Hans) h4 { letter-spacing: .01em; line-height: 1.35; }
section[id], header[id] { scroll-margin-top: 96px; }
::selection { background: var(--plum); color: #fff; }
.mono { font-family: var(--mono); }

/* ---------- Buttons ---------- */
.btn-s { display: inline-flex; align-items: center; gap: 10px; padding: 14px 26px; border-radius: 14px; font-weight: 600; font-size: 15px; text-decoration: none; border: 1.5px solid transparent; transition: all .25s ease; cursor: pointer; }
.btn-plum { background: var(--plum); color: #fff; }
.btn-plum:hover { background: var(--plum-800); color: #fff; transform: translateY(-2px); box-shadow: 0 12px 24px rgba(83, 55, 56, .3); }
.btn-mauve { background: var(--mauve); color: var(--plum-900); }
.btn-mauve:hover { background: #fff; color: var(--plum-900); transform: translateY(-2px); }
.btn-ghost { border-color: rgba(255, 255, 255, .35); color: #fff; background: transparent; }
.btn-ghost:hover { background: rgba(255, 255, 255, .1); color: #fff; }
.btn-outline { border-color: var(--plum); color: var(--plum); background: transparent; }
.btn-outline:hover { background: var(--plum); color: #fff; }

/* ---------- Common ---------- */
.section { padding: 110px 0; position: relative; }
@media (max-width: 767.98px) { .section { padding: 72px 0; } }
.tag { display: inline-flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 13px; font-weight: 500; color: var(--plum); background: var(--mauve-100); border: 1px solid var(--mauve-200); padding: 6px 14px; border-radius: 50px; margin-bottom: 20px; }
.tag::before { content: "//"; color: var(--mauve); }
.h-sec { font-size: clamp(32px, 4.2vw, 52px); line-height: 1.12; margin-bottom: 18px; }
.h-sec .soft { color: var(--mauve); }
.lead { font-size: 18px; color: var(--muted); }

/* ---------- Floating capsule nav ---------- */
.capsule-wrap { position: fixed; top: 16px; left: 0; right: 0; z-index: 1030; padding: 0 16px; transition: top .3s ease; }
.capsule { max-width: 1240px; margin: 0 auto; background: rgba(255, 255, 255, .9); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border: 1px solid rgba(83, 55, 56, .12); border-radius: 22px; box-shadow: 0 10px 40px rgba(46, 29, 30, .12); display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 10px 10px 10px 22px; position: relative; }
.capsule-wrap.scrolled { top: 10px; }
.capsule .brand img { height: 36px; width: auto; display: block; }
.capsule .links { display: flex; align-items: center; gap: 2px; list-style: none; margin: 0; padding: 0; }
.capsule .links a { display: block; padding: 9px 14px; border-radius: 12px; font-size: 14.5px; font-weight: 500; color: var(--gray); text-decoration: none; transition: all .2s ease; }
.capsule .links a:hover { color: var(--plum); background: var(--mauve-100); }
.capsule .links a.active { color: #fff; background: var(--plum); }
.capsule .right { display: flex; align-items: center; gap: 8px; }
.lang { display: inline-flex; background: var(--mauve-100); border-radius: 12px; padding: 4px; }
.lang button { white-space: nowrap; border: 0; background: transparent; font-family: var(--mono); font-size: 12.5px; font-weight: 600; color: var(--muted); padding: 7px 11px; border-radius: 9px; cursor: pointer; }
.lang button.active { background: #fff; color: var(--plum); box-shadow: 0 2px 6px rgba(46, 29, 30, .12); }
.capsule .cta { padding: 11px 18px; font-size: 14px; border-radius: 12px; }
.burger { display: none; width: 44px; height: 44px; border-radius: 12px; border: 0; background: var(--plum); color: #fff; font-size: 22px; align-items: center; justify-content: center; }
@media (max-width: 1199.98px) {
    .burger { display: inline-flex; }
    .capsule .cta { display: none; }
    .capsule .links { display: none; position: absolute; top: calc(100% + 10px); left: 0; right: 0; flex-direction: column; align-items: stretch; background: #fff; border-radius: 22px; padding: 12px; box-shadow: 0 20px 50px rgba(46, 29, 30, .18); border: 1px solid rgba(83, 55, 56, .1); }
    .capsule-wrap.open .links { display: flex; }
    .capsule .links a { padding: 13px 16px; font-size: 16px; }
}
@media (max-width: 575.98px) { .capsule { padding: 8px 8px 8px 12px; gap: 8px; } .capsule .brand img { height: 22px; } .lang button { padding: 6px 7px; font-size: 11.5px; } .burger { width: 40px; height: 40px; } }
@media (max-width: 374.98px) { .capsule .brand img { height: 18px; } }

/* ---------- Hero ---------- */
.hero { background: var(--plum); color: rgba(255, 255, 255, .78); padding: 180px 0 120px; position: relative; overflow: hidden; border-radius: 0 0 48px 48px; }
.hero::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px); background-size: 48px 48px; mask-image: radial-gradient(ellipse at 70% 40%, #000 20%, transparent 75%); -webkit-mask-image: radial-gradient(ellipse at 70% 40%, #000 20%, transparent 75%); }
.hero::after { content: ""; position: absolute; width: 620px; height: 620px; right: -160px; top: -120px; border-radius: 50%; background: radial-gradient(circle, rgba(185, 174, 174, .28), transparent 65%); }
.hero .container { position: relative; z-index: 1; }
.hero .tag { background: rgba(255, 255, 255, .08); border-color: rgba(255, 255, 255, .15); color: var(--mauve-200); }
.hero .tag::before { color: var(--amber); }
.hero h1 { color: #fff; font-size: clamp(40px, 5.6vw, 72px); line-height: 1.06; margin-bottom: 26px; }
html:lang(zh-Hans) .hero h1 { line-height: 1.25; }
.hero h1 .soft { color: var(--mauve); }
.hero p.lead { color: rgba(255, 255, 255, .72); max-width: 560px; margin-bottom: 36px; }
.level-chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 40px; }
.level-chips span { font-family: var(--mono); font-size: 13px; padding: 8px 14px; border-radius: 10px; background: rgba(255, 255, 255, .07); border: 1px solid rgba(255, 255, 255, .12); color: rgba(255, 255, 255, .85); }
.level-chips span b { color: var(--amber); font-weight: 600; margin-right: 6px; }

/* Code window */
.codewin { background: var(--plum-900); border: 1px solid rgba(255, 255, 255, .12); border-radius: var(--r); box-shadow: 0 40px 80px rgba(0, 0, 0, .35); overflow: hidden; font-family: var(--mono); font-size: 14px; line-height: 1.85; }
.codewin .bar { display: flex; align-items: center; gap: 8px; padding: 14px 18px; background: rgba(255, 255, 255, .04); border-bottom: 1px solid rgba(255, 255, 255, .08); }
.codewin .bar i { width: 11px; height: 11px; border-radius: 50%; background: #E06C6C; display: inline-block; }
.codewin .bar i:nth-child(2) { background: var(--amber); }
.codewin .bar i:nth-child(3) { background: var(--mint); }
.codewin .bar span { margin-left: 10px; font-size: 12.5px; color: rgba(255, 255, 255, .5); }
.codewin pre { margin: 0; padding: 22px 24px 26px; color: #EDE6E5; white-space: pre-wrap; word-break: break-word; font-family: var(--mono); font-size: 14px; }
.c-k { color: #D8A0C8; } .c-f { color: var(--amber); } .c-s { color: var(--mint); } .c-n { color: #9FC2F0; } .c-c { color: rgba(255, 255, 255, .38); }
.codewin .out { border-top: 1px dashed rgba(255, 255, 255, .12); padding: 14px 24px 18px; color: var(--mint); font-size: 13px; }
.caret { display: inline-block; width: 8px; height: 16px; background: var(--amber); vertical-align: -3px; animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
@media (max-width: 575.98px) { .codewin pre { font-size: 12.5px; padding: 18px; } }

/* ---------- Stack marquee ---------- */
.stack { padding: 44px 0 0; overflow: hidden; }
.stack .label { text-align: center; font-family: var(--mono); font-size: 13px; color: var(--muted); margin-bottom: 18px; }
.stack-track { display: flex; gap: 12px; width: max-content; animation: slide 40s linear infinite; }
.stack-track span { font-family: var(--mono); font-size: 15px; font-weight: 500; color: var(--plum); background: #fff; border: 1px solid var(--line); padding: 10px 18px; border-radius: 12px; white-space: nowrap; }
@keyframes slide { to { transform: translateX(-50%); } }

/* ---------- Levels ---------- */
.level { background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg); padding: 38px 34px; height: 100%; position: relative; transition: transform .3s ease, box-shadow .3s ease; }
.level:hover { transform: translateY(-6px); box-shadow: 0 24px 50px rgba(46, 29, 30, .1); }
.level .lv-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 26px; }
.level .lv-code { font-family: var(--mono); font-size: 13px; color: var(--muted); }
.level .bars { display: flex; gap: 4px; }
.level .bars i { width: 8px; height: 22px; border-radius: 3px; background: var(--mauve-200); display: block; }
.level .bars i.on { background: var(--plum); }
.level h3 { font-size: 28px; margin-bottom: 10px; }
.level p { color: var(--muted); }
.level ul { list-style: none; padding: 0; margin: 22px 0 0; border-top: 1px solid var(--line); }
.level li { padding: 11px 0 11px 28px; border-bottom: 1px solid var(--line); position: relative; font-size: 15px; }
.level li::before { content: "→"; position: absolute; left: 0; color: var(--plum); font-family: var(--mono); }
.level.featured { background: var(--plum); border-color: var(--plum); color: rgba(255, 255, 255, .78); }
.level.featured h3 { color: #fff; }
.level.featured p, .level.featured .lv-code { color: rgba(255, 255, 255, .7); }
.level.featured ul, .level.featured li { border-color: rgba(255, 255, 255, .15); }
.level.featured li { color: #fff; }
.level.featured li::before { color: var(--amber); }
.level.featured .bars i { background: rgba(255, 255, 255, .2); }
.level.featured .bars i.on { background: var(--amber); }

/* ---------- Bento services ---------- */
.services { background: var(--mauve-100); border-radius: 48px; margin: 0 12px; }
.bento { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.b-card { background: #fff; border-radius: var(--r); padding: 30px; border: 1px solid var(--line); display: flex; flex-direction: column; transition: transform .3s ease; }
.b-card:hover { transform: translateY(-4px); }
.b-card .ic { width: 50px; height: 50px; border-radius: 14px; background: var(--mauve-100); color: var(--plum); display: flex; align-items: center; justify-content: center; font-size: 24px; margin-bottom: 22px; }
.b-card h4 { font-size: 20px; margin-bottom: 8px; }
.b-card p { color: var(--muted); font-size: 15px; margin: 0; }
.b-wide { grid-column: span 2; }
.b-tall { grid-row: span 2; }
.b-dark { background: var(--plum-900); border-color: var(--plum-900); color: rgba(255, 255, 255, .72); }
.b-dark h4 { color: #fff; }
.b-dark p { color: rgba(255, 255, 255, .65); }
.b-dark .ic { background: rgba(255, 255, 255, .08); color: var(--amber); }
.b-plum { background: var(--plum); border-color: var(--plum); }
.b-plum h4 { color: #fff; font-size: 26px; }
.b-plum p { color: rgba(255, 255, 255, .72); }
.b-plum .ic { background: rgba(255, 255, 255, .1); color: var(--mauve-200); }
.b-plum .big { font-family: var(--mono); font-size: 14px; color: var(--amber); margin-top: auto; padding-top: 24px; }
.mini-list { list-style: none; padding: 0; margin: 18px 0 0; display: flex; flex-wrap: wrap; gap: 8px; }
.mini-list li { font-family: var(--mono); font-size: 12.5px; padding: 6px 10px; border-radius: 8px; background: rgba(255, 255, 255, .07); border: 1px solid rgba(255, 255, 255, .12); color: rgba(255, 255, 255, .85); }
@media (max-width: 1199.98px) { .bento { grid-template-columns: repeat(2, 1fr); } .b-tall { grid-row: auto; } }
@media (max-width: 575.98px) { .bento { grid-template-columns: 1fr; } .b-wide { grid-column: auto; } .services { margin: 0; border-radius: 32px; } }

/* ---------- Engagement models ---------- */
.model { border-radius: var(--r-lg); padding: 36px; height: 100%; border: 1.5px dashed var(--mauve); background: transparent; transition: all .3s ease; }
.model:hover { border-style: solid; border-color: var(--plum); background: #fff; }
.model .m-num { font-family: var(--mono); font-size: 13px; color: var(--plum); background: var(--mauve-100); display: inline-block; padding: 4px 10px; border-radius: 8px; margin-bottom: 20px; }
.model h4 { font-size: 24px; margin-bottom: 10px; }
.model p { color: var(--muted); margin-bottom: 18px; }
.model .fit { font-size: 14px; color: var(--ink); border-top: 1px solid var(--line); padding-top: 16px; margin: 0; }
.model .fit b { font-family: var(--mono); font-weight: 600; color: var(--plum); margin-right: 6px; }

/* ---------- Process (vertical timeline) ---------- */
.timeline { position: relative; padding-left: 40px; }
.timeline::before { content: ""; position: absolute; left: 13px; top: 8px; bottom: 8px; width: 2px; background: linear-gradient(var(--plum), var(--mauve)); }
.t-step { position: relative; padding: 0 0 40px; }
.t-step:last-child { padding-bottom: 0; }
.t-step::before { content: ""; position: absolute; left: -35px; top: 6px; width: 18px; height: 18px; border-radius: 50%; background: var(--cream); border: 3px solid var(--plum); }
.t-step .t-meta { font-family: var(--mono); font-size: 13px; color: var(--plum); margin-bottom: 4px; }
.t-step h4 { font-size: 22px; margin-bottom: 6px; }
.t-step p { color: var(--muted); margin: 0; }
.process-card { background: var(--plum-900); border-radius: var(--r-lg); padding: 40px; color: rgba(255, 255, 255, .72); height: 100%; position: relative; overflow: hidden; }
.process-card h3 { color: #fff; font-size: 30px; }
.process-card .check { list-style: none; padding: 0; margin: 26px 0 0; }
.process-card .check li { padding: 10px 0; border-bottom: 1px solid rgba(255, 255, 255, .1); display: flex; gap: 12px; }
.process-card .check li i { color: var(--mint); font-size: 20px; }
.process-card::after { content: "{ }"; position: absolute; right: 24px; bottom: -30px; font-family: var(--mono); font-size: 160px; color: rgba(255, 255, 255, .04); font-weight: 700; }

/* ---------- FAQ ---------- */
.qa { border-bottom: 1px solid var(--line); }
.qa summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 24px 0; font-weight: 600; font-size: 18px; color: var(--ink); }
.qa summary::-webkit-details-marker { display: none; }
.qa summary::after { content: "+"; font-family: var(--mono); font-size: 22px; width: 38px; height: 38px; border-radius: 12px; background: var(--mauve-100); color: var(--plum); display: flex; align-items: center; justify-content: center; flex-shrink: 0; transition: all .25s ease; }
.qa[open] summary::after { content: "−"; background: var(--plum); color: #fff; }
.qa p { color: var(--muted); padding: 0 50px 24px 0; margin: 0; }

/* ---------- Contact ---------- */
.contact-card { background: #fff; border-radius: var(--r-lg); border: 1px solid var(--line); box-shadow: 0 30px 70px rgba(46, 29, 30, .08); padding: 48px; }
@media (max-width: 575.98px) { .contact-card { padding: 28px 20px; } }
.contact-card label { font-size: 14px; font-weight: 600; margin-bottom: 6px; display: block; color: var(--ink); }
.contact-card .form-control, .contact-card .form-select { border-radius: 12px; border: 1.5px solid var(--line); padding: 12px 16px; background-color: var(--cream); font-size: 15px; }
.contact-card .form-control:focus, .contact-card .form-select:focus { border-color: var(--plum); background-color: #fff; box-shadow: 0 0 0 4px rgba(83, 55, 56, .1); }
.pick { display: flex; flex-wrap: wrap; gap: 8px; }
.pick input { position: absolute; opacity: 0; pointer-events: none; }
.pick label { margin: 0; font-family: var(--mono); font-size: 13px; font-weight: 500; padding: 9px 14px; border-radius: 10px; border: 1.5px solid var(--line); cursor: pointer; background: var(--cream); color: var(--gray); }
.pick input:checked + label { background: var(--plum); border-color: var(--plum); color: #fff; }
.pick input:focus-visible + label { outline: 2px solid var(--plum); outline-offset: 2px; }
.contact-aside h2 { font-size: clamp(30px, 3.6vw, 44px); }
.c-item { display: flex; gap: 16px; align-items: center; padding: 18px 0; border-bottom: 1px solid var(--line); text-decoration: none; color: var(--ink); }
.c-item i { width: 46px; height: 46px; border-radius: 14px; background: var(--plum); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 20px; flex-shrink: 0; }
.c-item small { display: block; font-family: var(--mono); font-size: 12px; color: var(--muted); }
.c-item:hover { color: var(--plum); }
.form-msg { border-radius: 12px; padding: 12px 16px; font-size: 14.5px; background: var(--mauve-100); color: var(--plum-800); }

/* ---------- Footer ---------- */
.footer { background: var(--plum-900); color: rgba(255, 255, 255, .62); padding: 0 0 30px; margin-top: 120px; position: relative; }
.footer-cta { transform: translateY(-50%); background: var(--mauve); border-radius: var(--r-lg); padding: 44px 48px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 24px; box-shadow: 0 30px 60px rgba(46, 29, 30, .25); }
.footer-cta h3 { margin: 0; font-size: clamp(24px, 3vw, 34px); color: var(--plum-900); }
.footer-cta p { margin: 6px 0 0; color: var(--plum-800); font-family: var(--mono); font-size: 14px; }
@media (max-width: 575.98px) { .footer-cta { padding: 30px 24px; } }
.footer .f-logo { height: 46px; width: auto; max-width: 100%; }
.footer h6 { font-family: var(--mono); color: var(--mauve); font-size: 13px; font-weight: 600; margin-bottom: 18px; }
.footer h6::before { content: "> "; color: var(--amber); }
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer li { margin-bottom: 10px; }
.footer a { color: rgba(255, 255, 255, .7); text-decoration: none; }
.footer a:hover { color: #fff; }
.footer .lang { background: rgba(255, 255, 255, .08); }
.footer .lang button { color: rgba(255, 255, 255, .6); }
.footer .lang button.active { background: var(--mauve); color: var(--plum-900); }
.f-bottom { border-top: 1px solid rgba(255, 255, 255, .1); margin-top: 56px; padding-top: 24px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; font-size: 14px; }
.f-bottom .mono { color: var(--mauve); }

/* ---------- Reveal ---------- */
.rv { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s ease; }
.rv.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .rv { opacity: 1; transform: none; transition: none; } .stack-track, .caret { animation: none; } }