/* Mini Loop Band — 单页 landing 主题
   品牌色：红 #e60013 / 深底高亮 #ff616d / 深底 #191b1d；字体 Montserrat */
:root {
  --red: #e60013;
  --red-bright: #ff616d;
  --dark: #191b1d;
  --dark-card: #222527;
  --tint: #f6f6f4;
  --line: #e5e5e5;
  --text: #222;
  --muted: #707070;
  --dark-muted: #b7babc;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: "Montserrat", system-ui, sans-serif; color: var(--text); line-height: 1.6; }
img { max-width: 100%; }
h1, h2, h3 { margin: 0; letter-spacing: -.04em; line-height: 1.08; }
h1 { font-size: clamp(44px, 6vw, 78px); font-weight: 700; letter-spacing: -.055em; line-height: 1; }
h2 { font-size: clamp(34px, 4vw, 58px); }
.eyebrow { margin: 0 0 14px; color: var(--red); font-size: 11px; font-weight: 800; letter-spacing: .18em; text-transform: uppercase; }
.section--dark .eyebrow { color: var(--red-bright); }

/* ── Header ── */
.site-header { position: sticky; top: 0; z-index: 50; background: #fff; border-bottom: 1px solid var(--line); }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; max-width: 1400px; margin: 0 auto; padding: 18px 5%; }
.site-header__brand { font-weight: 800; letter-spacing: -.02em; text-decoration: none; color: var(--text); }
.site-header__nav { display: flex; align-items: center; gap: 22px; font-size: 12px; font-weight: 700; }
.site-header__nav a { text-decoration: none; color: var(--text); }
.site-header__nav a:hover { color: var(--red); }
.site-header__cta { color: #fff !important; background: var(--red); padding: 10px 16px; border-radius: 4px; }
.lang-switch { position: relative; }
.lang-switch__btn { display: inline-flex; align-items: center; gap: 6px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 4px; background: #fff; color: var(--text); font: inherit; font-weight: 700; font-size: 12px; cursor: pointer; }
.lang-switch__btn:hover { border-color: var(--red); color: var(--red); }
.lang-switch__caret { font-size: 10px; }
.lang-switch__menu { position: absolute; top: calc(100% + 6px); right: 0; z-index: 60; display: none; min-width: 160px; padding: 6px; background: #fff; border: 1px solid var(--line); border-radius: 6px; box-shadow: 0 12px 30px rgba(0, 0, 0, .12); }
.lang-switch__menu a { display: block; padding: 9px 12px; border-radius: 4px; color: var(--text); font-size: 13px; font-weight: 600; text-decoration: none; }
.lang-switch__menu a:hover { background: var(--tint); color: var(--red); }
.lang-switch.is-open .lang-switch__menu { display: block; }
.lang-switch.is-open .lang-switch__btn { border-color: var(--red); color: var(--red); }
@media (max-width: 720px) { .site-header__nav { gap: 12px; font-size: 11px; } .site-header__nav a:not(.site-header__cta) { display: none; } }

/* ── Hero ── */
.hero { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 5%; align-items: center; min-height: 680px; padding: 60px 5%; }
.hero__intro { max-width: 680px; margin: 0 0 26px; color: #444; font-size: 17px; }
.hero__features { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 10px; margin: 0 0 30px; font-size: 13px; font-weight: 700; }
.hero__features span { color: var(--red); }
.hero__visual { position: relative; min-height: 380px; }
.band { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); display: grid; place-items: center; width: 55%; max-width: 260px; height: 55%; min-height: 210px; border: 42px solid var(--red); border-radius: 50%; }
.band span { font-size: 9px; font-weight: 800; letter-spacing: .16em; }

/* ── Trust bar ── */
.trust { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.trust__item { padding: 24px; text-align: center; border-right: 1px solid var(--line); }
.trust__item:last-child { border-right: 0; }
.trust__item strong { display: block; font-size: 11px; text-transform: uppercase; }
.trust__item small { color: var(--muted); }

/* ── Sections ── */
.section { padding: 90px 5%; }
.section--light { background: #fff; }
.section--tint { background: var(--tint); }
.section--dark { background: var(--dark); color: #fff; }
.section__head { max-width: 820px; margin-bottom: 45px; }
.section__head h2 { margin-bottom: 18px; }
.section__intro { color: var(--muted); font-size: 15px; }
.section--dark .section__intro { color: var(--dark-muted); }
.section__split { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 6%; align-items: end; margin-bottom: 45px; }

/* ── Cards ── */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1px; background: var(--line); }
.cards--gutter { gap: 10px; background: transparent; }
.card { min-height: 215px; padding: 28px; background: #fff; }
.card__no { color: var(--red); font-size: 10px; font-weight: 800; }
.card h3 { margin: 42px 0 10px; font-size: 18px; }
.card p { color: var(--muted); font-size: 12px; }
.card--dark { background: var(--dark-card); color: #fff; }
.card--dark .card__big { color: var(--red-bright); font-size: 38px; }
.card--dark h3 { margin: 35px 0 20px; }
.card--dark ul { padding-left: 18px; color: var(--dark-muted); font-size: 11px; line-height: 2; }

/* ── Specification visual ── */
.spec-visual { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 430px; padding: 30px; background: #fff; border: 1px solid var(--line); text-align: center; }
.spec-visual__ring { display: grid; place-items: center; width: 230px; max-width: 80%; height: 150px; border: 20px solid var(--red); border-radius: 50%; }
.spec-visual__ring strong { font-size: 32px; }
.spec-visual__ring small { font-size: 8px; letter-spacing: .14em; text-transform: uppercase; }
.spec-visual h3 { margin: 22px 0 8px; }
.spec-visual p { max-width: 320px; color: var(--muted); font-size: 11px; }

/* ── Spec table ── */
.spec-table { width: 100%; border-collapse: collapse; background: #fff; }
.spec-table th { width: 38%; padding: 18px; border-bottom: 1px solid var(--line); color: var(--muted); text-align: left; }
.spec-table td { padding: 18px; border-bottom: 1px solid var(--line); font-weight: 700; }

/* ── Resistance table ── */
.resistance-table-wrap { overflow-x: auto; }
.resistance-table { width: 100%; border-collapse: collapse; color: #fff; font-size: 13px; }
.resistance-table th, .resistance-table td { padding: 13px 16px; border-bottom: 1px solid #3b3e40; text-align: left; }
.resistance-table th { color: var(--red-bright); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; }
.resistance-table td { color: var(--dark-muted); }
.resistance-table tr:hover td { background: #222527; }

/* ── Custom visual ── */
.custom-visual { position: relative; min-height: 430px; margin-top: 25px; background: var(--tint); overflow: hidden; }
.custom-band { position: absolute; display: grid; place-items: center; border-radius: 50%; }
.custom-band span { font-size: 9px; font-weight: 800; letter-spacing: .16em; }
.custom-band--std { top: 55px; left: 5%; width: 55%; height: 48%; border: 35px solid #222; filter: drop-shadow(0 18px 12px rgba(0, 0, 0, .13)); transform: rotate(-12deg); }
.custom-band--custom { right: -5%; bottom: 45px; width: 68%; height: 58%; border: 35px solid var(--red); filter: drop-shadow(0 18px 12px rgba(0, 0, 0, .13)); transform: rotate(12deg); }

/* ── Feature grid ── */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 10px; margin: 25px 0 30px; font-size: 12px; font-weight: 700; }

/* ── Packaging row ── */
.pack-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); border-top: 1px solid #171717; }
.pack-item { display: flex; flex-direction: column; min-height: 150px; padding: 22px; border-right: 1px solid var(--line); }
.pack-item:last-child { border-right: 0; }
.pack-item__img { width: 100%; aspect-ratio: 4/3; object-fit: cover; border-radius: 4px; margin-bottom: 14px; }
.pack-item span { color: var(--red); font-size: 10px; }
.pack-item strong { margin-top: 35px; }
.pack-item small { color: var(--muted); }

/* ── FAQ ── */
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary { padding: 22px 3px; font-size: 13px; font-weight: 800; cursor: pointer; }
.faq-item p { color: var(--muted); font-size: 13px; padding: 0 3px 22px; }

/* ── Enquiry ── */
.enquiry-list { padding-left: 18px; color: #c9cbcc; font-size: 11px; line-height: 2; }
.enquiry-email { display: inline-block; margin-top: 20px; color: var(--red-bright); text-decoration: none; font-weight: 800; }
.inquiry-form { display: flex; flex-direction: column; gap: 14px; padding: 30px; background: #222527; border-radius: 8px; }
.inquiry-form label { display: flex; flex-direction: column; gap: 6px; color: #c9cbcc; font-size: 11px; font-weight: 700; text-transform: uppercase; }
.inquiry-form input, .inquiry-form select, .inquiry-form textarea { padding: 12px 14px; border: 1px solid #3b3e40; border-radius: 4px; background: var(--dark); color: #fff; font: inherit; }
.inquiry-form .btn { align-self: flex-start; }

/* ── Buttons ── */
.btn { display: inline-flex; align-items: center; min-height: 50px; padding: 0 24px; border: 0; border-radius: 4px; text-decoration: none; font-size: 12px; font-weight: 800; cursor: pointer; }
.btn--primary { background: var(--red); color: #fff; }
.btn--primary:hover { background: #d10012; }

/* ── Footer ── */
.site-footer { background: var(--dark); color: #c9cbcc; padding: 60px 5% 30px; }
.site-footer__inner { display: flex; justify-content: space-between; gap: 30px; flex-wrap: wrap; max-width: 1400px; margin: 0 auto; }
.site-footer strong { color: #fff; }
.site-footer p { color: var(--dark-muted); font-size: 13px; max-width: 420px; }
.site-footer__contact a { display: block; color: var(--red-bright); text-decoration: none; font-size: 13px; margin-bottom: 8px; }
.site-footer__bottom { max-width: 1400px; margin: 40px auto 0; border-top: 1px solid #3b3e40; padding-top: 20px; font-size: 11px; color: var(--dark-muted); }

@media (max-width: 720px) {
  .section { padding: 60px 5%; }
  .hero { min-height: auto; padding: 40px 5%; }
  .trust__item { border-right: 0; border-bottom: 1px solid var(--line); }
  .pack-item { border-right: 0; border-bottom: 1px solid var(--line); }
}