/* SparkUp Media — site styles
   Brand tokens live here. Change a value once and the whole site follows. */
:root {
  --ink: #1b2126;        /* brand navy: headings, body */
  --ink-soft: #515a62;   /* secondary text */
  --ink-faint: #7f878e;  /* captions */
  --line: #e2e6ea;       /* hairlines */
  --paper: #ffffff;
  --mist: #f6f5f3;       /* alternate section background */
  --spark: #f4701f;      /* brand orange: marks, numerals */
  --spark-ink: #cf4a08;  /* orange dark enough for text and buttons */
  --navy: #161b20;
  --radius: 22px;
  --wrap: 1120px;
  --gutter: 24px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI Variable Display", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --h1: clamp(2.5rem, 6.2vw, 5rem);
  --h2: clamp(1.9rem, 4vw, 3.25rem);
  --h3: clamp(1.25rem, 1.9vw, 1.5rem);
  --lead: clamp(1.125rem, 1.6vw, 1.375rem);
  --track-display: -0.035em;
  --lh-body: 1.6;
}

/* Chinese pages: own type system. Full-width glyphs read larger and denser
   than Latin, so headings are smaller and lighter, lines are more open. */
html[lang="zh-CN"] {
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "MiSans", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans SC", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
  --h1: clamp(2.125rem, 5.2vw, 4.125rem);
  --h2: clamp(1.7rem, 3.4vw, 2.75rem);
  --h3: clamp(1.2rem, 1.7vw, 1.4rem);
  --lead: clamp(1.0625rem, 1.45vw, 1.25rem);
  --track-display: 0.01em;
  --lh-body: 1.85;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: var(--lh-body);
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
html[lang="zh-CN"] body { line-break: strict; }
img, svg { max-width: 100%; display: block; }
img { height: auto; }
a { color: inherit; }
h1, h2, h3, h4, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
h1, h2, h3, h4 { line-height: 1.08; letter-spacing: var(--track-display); font-weight: 700; text-wrap: balance; }
html[lang="zh-CN"] h1, html[lang="zh-CN"] h2, html[lang="zh-CN"] h3, html[lang="zh-CN"] h4 { line-height: 1.3; font-weight: 600; }
h1 { font-size: var(--h1); }
h2 { font-size: var(--h2); }
h3 { font-size: var(--h3); line-height: 1.25; letter-spacing: -0.015em; }
html[lang="zh-CN"] h3 { letter-spacing: 0.01em; line-height: 1.45; }
p { text-wrap: pretty; }
:focus-visible { outline: 3px solid var(--spark); outline-offset: 3px; border-radius: 6px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: #fff; padding: 10px 16px; border-radius: 10px; z-index: 100; }
.skip:focus { left: 8px; }

.wrap { width: 100%; max-width: calc(var(--wrap) + var(--gutter) * 2); margin-inline: auto; padding-inline: var(--gutter); }
.narrow { max-width: 760px; }
.center { text-align: center; margin-inline: auto; }
.band { padding-block: clamp(72px, 10vw, 136px); }
.band-mist { background: var(--mist); }
.band-navy { background: var(--navy); color: #fff; }
.band-tight { padding-block: clamp(56px, 7vw, 96px); }
.lead { font-size: var(--lead); color: var(--ink-soft); line-height: 1.5; }
html[lang="zh-CN"] .lead { line-height: 1.75; }
.band-navy .lead { color: #c3c8cd; }
.head { max-width: 780px; margin-bottom: clamp(40px, 5vw, 72px); }
.head.center { margin-inline: auto; }
.head h2 + .lead { margin-top: 20px; }
.note { font-size: 0.875rem; color: var(--ink-faint); line-height: 1.5; }
.band-navy .note { color: #8fa0b3; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 26px; border-radius: 999px; font: inherit; font-size: 1rem; font-weight: 600; text-decoration: none; border: 0; cursor: pointer; transition: background-color .2s, color .2s; line-height: 1.2; }
.btn-primary { background: var(--spark-ink); color: #fff; }
.btn-primary:hover { background: #b23f06; }
.btn-light { background: #fff; color: var(--ink); }
.btn-light:hover { background: #e9edf1; }
.link { color: var(--spark-ink); font-weight: 600; text-decoration: none; border-bottom: 1px solid transparent; }
.link:hover { border-bottom-color: currentColor; }
.band-navy .link { color: #ff9a62; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 28px; margin-top: 32px; }
.center .actions, .actions.center { justify-content: center; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.82); -webkit-backdrop-filter: saturate(180%) blur(18px); backdrop-filter: saturate(180%) blur(18px); border-bottom: 1px solid rgba(27,33,38,.08); }
.site-header .wrap { display: flex; align-items: center; gap: 20px; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; margin-right: auto; }
.brand svg { width: 34px; height: 34px; flex: none; }
.brand img { height: 42px; width: auto; }
.brand-name { display: flex; flex-direction: column; line-height: 1; font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; }
.brand-name b { font-size: 1.1875rem; font-weight: 700; letter-spacing: -0.03em; }
.brand-name span { font-size: 0.5625rem; font-weight: 600; letter-spacing: 0.34em; margin-top: 3px; padding-left: 1px; }
.nav { display: flex; align-items: center; gap: 30px; }
.nav a { text-decoration: none; font-size: 0.9375rem; color: var(--ink-soft); padding: 8px 0; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }
.nav a[aria-current="page"] { font-weight: 600; }
.lang { display: inline-flex; padding: 3px; background: #eceff2; border-radius: 999px; font-size: 0.8125rem; flex: none; }
.lang a { text-decoration: none; padding: 5px 12px; border-radius: 999px; color: var(--ink-soft); line-height: 1.3; min-height: 28px; display: inline-flex; align-items: center; }
.lang a[aria-current="true"] { background: #fff; color: var(--ink); font-weight: 600; box-shadow: 0 1px 2px rgba(27,33,38,.14); }
.nav-cta { min-height: 38px; padding: 0 18px; font-size: 0.875rem; }
.menu-btn { display: none; width: 42px; height: 42px; border: 0; background: none; padding: 0; cursor: pointer; border-radius: 10px; }
.menu-btn span { display: block; width: 20px; height: 2px; background: var(--ink); margin: 5px auto; border-radius: 2px; transition: transform .2s, opacity .2s; }
.menu-btn[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-btn[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-btn[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 860px) {
  .menu-btn { display: block; order: 3; margin-right: -8px; }
  .nav-cta { display: none; }
  .nav { position: absolute; left: 0; right: 0; top: 64px; background: #fff; flex-direction: column; align-items: stretch; gap: 0; padding: 8px var(--gutter) 24px; border-bottom: 1px solid var(--line); display: none; box-shadow: 0 24px 40px rgba(27,33,38,.08); }
  .nav.open { display: flex; }
  .nav a { font-size: 1.25rem; font-weight: 600; color: var(--ink); padding: 16px 0; border-bottom: 1px solid var(--line); }
  .nav a:last-child { border-bottom: 0; }
}

/* Hero */
.hero { padding-top: clamp(56px, 8vw, 112px); text-align: center; overflow: hidden; background: linear-gradient(to bottom, #fff calc(100% - clamp(150px, 20vw, 300px)), var(--mist) calc(100% - clamp(150px, 20vw, 300px))); }
.hero h1 { max-width: 15ch; margin-inline: auto; }
html[lang="zh-CN"] .hero h1 { max-width: 12em; }
.hero .lead { max-width: 660px; margin: 24px auto 0; }
.hero .note { margin-top: 20px; }
.page-hero { padding-block: clamp(64px, 9vw, 128px) clamp(40px, 5vw, 72px); }
.page-hero h1 { font-size: clamp(2.25rem, 5.2vw, 4.25rem); max-width: 18ch; }
html[lang="zh-CN"] .page-hero h1 { font-size: clamp(2rem, 4.4vw, 3.5rem); max-width: 14em; }
.page-hero .lead { max-width: 680px; margin-top: 24px; }

/* Phone-framed posts: the signature element */
.phones { display: flex; justify-content: center; align-items: flex-end; gap: clamp(14px, 2.4vw, 32px); margin-top: clamp(48px, 6vw, 80px); }
.phone { flex: 0 0 clamp(190px, 23vw, 288px); border-radius: clamp(22px, 2.6vw, 34px); overflow: hidden; background: #15171c; box-shadow: 0 0 0 1px rgba(27,33,38,.1), 0 30px 60px -20px rgba(27,33,38,.35); }
.phone img { width: 100%; height: auto; aspect-ratio: 1320 / 2400; object-fit: cover; object-position: top; }
.hero .phone:nth-child(2) { transform: translateY(clamp(-48px, -3.5vw, -20px)); }
.hero-floor { background: var(--mist); padding-top: 28px; padding-bottom: clamp(40px, 5vw, 64px); }
@media (max-width: 640px) {
  .phone { flex-basis: 58vw; }
}
@media (prefers-reduced-motion: no-preference) {
  .hero .phone { animation: rise .9s cubic-bezier(.2,.7,.2,1) both; }
  .hero .phone:nth-child(1) { animation-delay: .12s; }
  .hero .phone:nth-child(3) { animation-delay: .24s; }
  @keyframes rise { from { opacity: 0; translate: 0 40px; } to { opacity: 1; translate: 0 0; } }
}
.tally { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px clamp(28px, 6vw, 80px); text-align: center; }
.tally div { min-width: 120px; }
.tally b { display: block; font-size: clamp(1.75rem, 3vw, 2.5rem); letter-spacing: -0.03em; line-height: 1.1; font-weight: 700; }
.tally span { font-size: 0.9375rem; color: var(--ink-soft); }

/* Three-up columns separated by hairlines, not cards */
.cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(28px, 4vw, 56px); }
.cols-4 { grid-template-columns: repeat(4, 1fr); gap: clamp(24px, 3vw, 40px); }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.col { border-top: 2px solid var(--ink); padding-top: 24px; }
.band-navy .col { border-top-color: rgba(255,255,255,.28); }
.col h3 { margin-bottom: 14px; }
.col p, .col li { color: var(--ink-soft); font-size: 1rem; }
.band-navy .col p, .band-navy .col li { color: #b9c5d2; }
.col li { padding: 10px 0; border-top: 1px solid var(--line); }
.col li:first-child { border-top: 0; padding-top: 0; }
.col p + ul { margin-top: 16px; }
.col p + p { margin-top: 12px; }
@media (max-width: 900px) {
  .cols, .cols-4 { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .cols, .cols-4, .cols-2 { grid-template-columns: 1fr; gap: 36px; }
}

/* Numbered steps: used only for real sequences */
.steps { counter-reset: step; }
.steps .col { position: relative; }
.steps .col::before { counter-increment: step; content: counter(step); display: block; font-size: 2.75rem; font-weight: 700; letter-spacing: -0.04em; line-height: 1; color: var(--spark); margin-bottom: 18px; font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, Arial, sans-serif; }

/* Split: text beside media or beside a list */
.split { display: grid; grid-template-columns: 5fr 6fr; gap: clamp(32px, 6vw, 96px); align-items: start; }
.split.even { grid-template-columns: 1fr 1fr; }
.split.form-split { grid-template-columns: 7fr 5fr; }
.split h2 + .lead, .split h2 + p { margin-top: 20px; }
.split .sticky { position: sticky; top: 104px; }
@media (max-width: 860px) {
  .split, .split.even, .split.form-split { grid-template-columns: 1fr; }
  .split .sticky { position: static; }
}
.rows > li, .rows > div { padding: 22px 0; border-top: 1px solid var(--line); }
.rows > :first-child { border-top: 2px solid var(--ink); }
.rows h3 { margin-bottom: 8px; }
.rows p { color: var(--ink-soft); }
.band-navy .rows > li { border-top-color: rgba(255,255,255,.16); }
.band-navy .rows > :first-child { border-top-color: rgba(255,255,255,.4); }
.band-navy .rows p { color: #b9c5d2; }
.ticks li { position: relative; padding: 9px 0 9px 30px; color: var(--ink-soft); }
.ticks li::before { content: ""; position: absolute; left: 2px; top: calc(9px + .5lh - 8px); width: 16px; height: 9px; border-left: 2.5px solid var(--spark); border-bottom: 2.5px solid var(--spark); transform: rotate(-45deg) scale(.8); transform-origin: center; }
.band-navy .ticks li { color: #d5dde6; }

/* Big figures */
.figures { display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(24px, 3vw, 48px); }
.figure b { display: block; font-size: clamp(2.75rem, 5.4vw, 4.5rem); font-weight: 700; letter-spacing: -0.045em; line-height: 1; font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, Arial, sans-serif; }
.figure b i { font-style: normal; color: var(--spark); }
.figure span { display: block; margin-top: 14px; font-size: 1rem; color: var(--ink-soft); line-height: 1.45; max-width: 22ch; }
.band-navy .figure span { color: #b9c5d2; }
.figures-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 860px) { .figures { grid-template-columns: 1fr 1fr; gap: 40px 24px; } }

/* Clients and industries */
.clients { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0 clamp(24px, 4vw, 56px); }
.clients li { padding: 24px 0; border-top: 1px solid var(--line); }
.clients b { display: block; font-size: 1.1875rem; letter-spacing: -0.01em; }
.clients span { color: var(--ink-soft); font-size: 0.9375rem; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chips li { padding: 9px 18px; border-radius: 999px; background: #fff; border: 1px solid var(--line); font-size: 0.9375rem; color: var(--ink); }
.center .chips, .chips.center { justify-content: center; }
@media (max-width: 760px) { .clients { grid-template-columns: 1fr; } }

/* Post case rows on the Work page */
.post { display: grid; grid-template-columns: minmax(220px, 300px) 1fr; gap: clamp(28px, 6vw, 88px); align-items: center; padding-block: clamp(36px, 5vw, 64px); border-top: 1px solid var(--line); }
.post:first-of-type { border-top: 0; padding-top: 0; }
.post:nth-of-type(even) .phone { order: 2; }
.post:nth-of-type(even) { grid-template-columns: 1fr minmax(220px, 300px); }
.post .phone { flex: none; width: 100%; }
.post h3 { font-size: clamp(1.5rem, 2.6vw, 2.125rem); letter-spacing: var(--track-display); line-height: 1.15; }
html[lang="zh-CN"] .post h3 { line-height: 1.35; }
.post .where { color: var(--ink-faint); font-size: 0.9375rem; margin-bottom: 10px; }
.post p.body { color: var(--ink-soft); margin-top: 16px; max-width: 54ch; }
.post .quote-title { margin-top: 16px; padding-left: 16px; border-left: 3px solid var(--spark); color: var(--ink); font-size: 1rem; }
.meter { display: flex; flex-wrap: wrap; gap: 8px 32px; margin-top: 26px; }
.meter div { display: flex; align-items: baseline; gap: 8px; }
.meter b { font-size: 1.75rem; letter-spacing: -0.03em; font-weight: 700; line-height: 1; font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, Arial, sans-serif; }
.meter span { color: var(--ink-soft); font-size: 0.9375rem; }
@media (max-width: 720px) {
  .post, .post:nth-of-type(even) { grid-template-columns: 1fr; }
  .post:nth-of-type(even) .phone { order: 0; }
  .post .phone { max-width: 260px; }
}

/* Quote */
.quote { max-width: 880px; margin-inline: auto; text-align: center; }
.quote blockquote { font-size: clamp(1.5rem, 3.2vw, 2.5rem); font-weight: 600; letter-spacing: var(--track-display); line-height: 1.22; text-wrap: balance; }
html[lang="zh-CN"] .quote blockquote { line-height: 1.5; font-weight: 600; }
.quote figcaption { margin-top: 24px; color: var(--ink-soft); }
.band-navy .quote figcaption { color: #b9c5d2; }

/* FAQ */
.faq details { border-top: 1px solid var(--line); }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { list-style: none; cursor: pointer; padding: 22px 44px 22px 0; position: relative; font-size: 1.125rem; font-weight: 600; letter-spacing: -0.01em; line-height: 1.4; }
html[lang="zh-CN"] .faq summary { letter-spacing: 0; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; position: absolute; right: 6px; top: 50%; width: 10px; height: 10px; border-right: 2px solid var(--ink); border-bottom: 2px solid var(--ink); transform: translateY(-70%) rotate(45deg); transition: transform .2s; }
.faq details[open] summary::after { transform: translateY(-30%) rotate(-135deg); }
.faq details p { padding: 0 44px 24px 0; color: var(--ink-soft); max-width: 68ch; }

/* Contact */
.form { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 20px; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 0.875rem; font-weight: 600; }
.field label em { font-style: normal; font-weight: 400; color: var(--ink-faint); }
.field input, .field textarea { font: inherit; font-size: 1rem; color: var(--ink); background: #fff; border: 1px solid #c9d0d8; border-radius: 12px; padding: 13px 15px; width: 100%; min-height: 50px; transition: border-color .15s, box-shadow .15s; }
.field textarea { min-height: 150px; resize: vertical; line-height: 1.5; }
.field input:focus, .field textarea:focus { outline: 0; border-color: var(--ink); box-shadow: 0 0 0 3px rgba(27,33,38,.12); }
.field input[aria-invalid="true"], .field textarea[aria-invalid="true"] { border-color: #c62828; }
.trap { position: absolute !important; left: -9999px !important; width: 1px; height: 1px; overflow: hidden; }
.form-status { grid-column: 1 / -1; font-size: 0.9375rem; line-height: 1.5; }
.form-status:empty { display: none; }
.form-status.err { color: #b3261e; }
.form-done { padding: 36px; border-radius: var(--radius); background: var(--mist); }
.form-done h2 { font-size: clamp(1.5rem, 2.4vw, 2rem); margin-bottom: 10px; }
.form-done p { color: var(--ink-soft); }
.aside-block { padding: 24px 0; border-top: 1px solid var(--line); }
.aside-block:first-child { border-top: 2px solid var(--ink); }
.aside-block h3 { font-size: 1rem; letter-spacing: 0; margin-bottom: 6px; }
.aside-block p, .aside-block a { color: var(--ink-soft); }
.aside-block a.mail { color: var(--ink); font-size: 1.25rem; font-weight: 600; text-decoration: none; letter-spacing: -0.01em; }
.aside-block a.mail:hover { color: var(--spark-ink); }
@media (max-width: 560px) { .form { grid-template-columns: 1fr; } }

/* WeChat card (Chinese pages) */
.wechat { display: flex; align-items: center; gap: 24px; padding: 22px; border-radius: var(--radius); background: #fff; color: var(--ink); text-align: left; max-width: 460px; }
.wechat img { width: 148px; height: 148px; flex: none; border-radius: 8px; }
.wechat h3 { font-size: 1.125rem; margin-bottom: 6px; }
.wechat p { font-size: 0.9375rem; color: var(--ink-soft); line-height: 1.6; }
.wechat .id { margin-top: 10px; font-size: 1rem; color: var(--ink); }
.wechat .id b { font-weight: 700; letter-spacing: 0.01em; user-select: all; }
.band-mist .wechat, .wechat.outlined { border: 1px solid var(--line); }
.cta-grid { display: grid; grid-template-columns: 1fr auto; gap: clamp(32px, 5vw, 72px); align-items: center; }
@media (max-width: 860px) { .cta-grid { grid-template-columns: 1fr; } }
@media (max-width: 420px) { .wechat { flex-direction: column; align-items: flex-start; } }

/* Closing call to action */
.cta h2 { max-width: 16ch; }
.center.cta h2, .cta.center h2 { margin-inline: auto; }
html[lang="zh-CN"] .cta h2 { max-width: 14em; }

/* Legal pages */
.prose h2 { font-size: 1.5rem; margin: 48px 0 12px; letter-spacing: -0.02em; }
.prose p, .prose li { color: var(--ink-soft); margin-top: 12px; max-width: 70ch; }
.prose ul { list-style: disc; padding-left: 22px; }
.prose a { color: var(--spark-ink); }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding-block: 56px 40px; font-size: 0.9375rem; color: var(--ink-soft); }
.foot-top { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 32px 48px; }
.foot-top p { max-width: 36ch; margin-top: 14px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 12px 28px; align-content: flex-start; }
.foot-links a, .foot-base a { text-decoration: none; color: var(--ink-soft); }
.foot-links a:hover, .foot-base a:hover { color: var(--ink); }
.foot-base { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px 24px; margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--line); font-size: 0.8125rem; color: var(--ink-faint); }
.foot-base nav { display: flex; gap: 20px; }

/* Multi-post campaigns on the Work page */
.campaign { padding-block: clamp(32px, 4vw, 52px); border-top: 1px solid var(--line); }
.campaign:first-of-type { border-top: 2px solid var(--ink); }
.campaign-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 16px 40px; margin-bottom: 24px; }
.campaign-head h3 { font-size: clamp(1.5rem, 2.6vw, 2.125rem); letter-spacing: -0.03em; line-height: 1.15; }
.campaign-head .where { color: var(--ink-faint); font-size: 0.9375rem; margin-bottom: 6px; }
.campaign-head .meter { margin-top: 0; }
.campaign p.body { color: var(--ink-soft); margin-top: 22px; max-width: 68ch; }
.strip { background: #fff; border-radius: var(--radius); padding: clamp(10px, 1.6vw, 20px); border: 1px solid var(--line); overflow-x: auto; -webkit-overflow-scrolling: touch; }
.strip img { width: 100%; min-width: 860px; height: auto; }
.strip-4 img { min-width: 700px; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(20px, 4vw, 56px); padding-top: clamp(32px, 4vw, 52px); border-top: 1px solid var(--line); max-width: 760px; }
.pair img { width: 100%; height: auto; border-radius: 16px; border: 1px solid var(--line); background: #fff; }
.pair figcaption { margin-top: 16px; color: var(--ink-soft); font-size: 0.9375rem; }
.pair figcaption b { display: block; color: var(--ink); font-size: 1.0625rem; margin-bottom: 4px; }
.shot img { width: 100%; max-width: 460px; height: auto; border-radius: var(--radius); box-shadow: 0 0 0 1px rgba(255,255,255,.14), 0 30px 60px -20px rgba(0,0,0,.6); }
@media (max-width: 860px) { .shot img { margin-inline: auto; } }

/* Cover wall: real post covers used as page imagery */
.hero-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, 440px); gap: clamp(32px, 5vw, 72px); align-items: center; }
.wall { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.wall img { width: 100%; height: auto; aspect-ratio: 3 / 4; object-fit: cover; border-radius: 14px; background: var(--mist); }
.wall img:nth-child(3n+2) { transform: translateY(22px); }
.wall-row img:nth-child(3n+2) { transform: none; }
.page-hero .wall { padding-bottom: 22px; }
@media (max-width: 860px) {
  .hero-split { grid-template-columns: 1fr; }
  .wall { gap: 8px; max-width: 520px; }
  .wall img { border-radius: 10px; }
}
.nav { gap: 26px; }
/* Xiaohongshu mark */
.xhs { display: inline-flex; align-items: center; justify-content: center; width: 84px; height: 84px; border-radius: 20px; background: #ff2442; color: #fff; font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Noto Sans CJK SC", sans-serif; font-weight: 700; font-size: 1.375rem; letter-spacing: 0.02em; line-height: 1; }
.sheet img { min-width: 1400px; }
.sheet { padding: 0; }
.wall-6 { grid-template-columns: repeat(6, 1fr); margin-top: clamp(40px, 5vw, 64px); }
.wall-6 img:nth-child(n) { transform: none; }
@media (max-width: 860px) { .wall-6 { grid-template-columns: repeat(3, 1fr); max-width: none; } }

/* v4 */
.xhs-logo { width: 84px; height: 84px; }
.impact { padding-top: 28px; border-top: 2px solid var(--ink); }
.impact + .impact { margin-top: clamp(48px, 6vw, 80px); }
.impact h3 { font-size: clamp(1.375rem, 2.2vw, 1.75rem); letter-spacing: -0.02em; }
html[lang="zh-CN"] .impact h3 { letter-spacing: 0.01em; }
.impact-sub { color: var(--ink-soft); margin: 8px 0 36px; }
html[lang="zh-CN"] .figure b { font-size: clamp(2.25rem, 4.4vw, 3.5rem); letter-spacing: -0.02em; }
.figure span { max-width: 26ch; }
.logos { display: grid; grid-template-columns: repeat(5, 1fr); gap: clamp(12px, 2vw, 24px); }
.logos li { display: flex; flex-direction: column; }
.logo-tile { display: flex; align-items: center; justify-content: center; background: #fff; border: 1px solid var(--line); border-radius: 18px; aspect-ratio: 4 / 3; padding: 14%; margin-bottom: 14px; }
.logo-tile img { max-width: 100%; max-height: 100%; width: auto; height: auto; object-fit: contain; }
.logos b { font-size: 1rem; letter-spacing: -0.01em; line-height: 1.35; }
.logos li > span:last-child { color: var(--ink-soft); font-size: 0.875rem; line-height: 1.4; margin-top: 2px; }
@media (max-width: 900px) { .logos { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 560px) { .logos { grid-template-columns: repeat(2, 1fr); } }
.shot img { max-width: 520px; }

.site-header .wrap { height: 72px; }
.brand img { height: 54px; width: auto; }
.site-footer .brand img { height: 60px; }
@media (max-width: 860px) { .nav { top: 72px; } .brand img { height: 48px; } }
.logo-tile { position: relative; padding: 0; }
.logo-tile img { position: absolute; inset: 15%; width: 70%; height: 70%; max-width: none; max-height: none; object-fit: contain; }

/* ===== v5: two-service structure ===== */
.kicker { font-size: 0.9375rem; font-weight: 600; color: var(--spark-ink); margin-bottom: 14px; }
.band-navy .kicker { color: #ff9a62; }
.hero-plain { background: none; padding-bottom: clamp(56px, 7vw, 96px); }
.hero-plain .lead { max-width: 720px; }
.svc-cards { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(16px, 2.4vw, 28px); margin-top: clamp(48px, 6vw, 80px); text-align: left; }
.svc-card { display: flex; flex-direction: column; background: var(--mist); border-radius: 28px; overflow: hidden; text-decoration: none; color: inherit; transition: box-shadow .25s, transform .25s; }
.svc-card:hover { box-shadow: 0 24px 48px -24px rgba(27,33,38,.35); transform: translateY(-3px); }
.svc-media { padding: clamp(18px, 2.4vw, 28px) clamp(18px, 2.4vw, 28px) 0; }
.svc-media .wall { grid-template-columns: repeat(6, 1fr); gap: 8px; }
.svc-media .wall img { border-radius: 10px; transform: none; }
.svc-logos .logos { grid-template-columns: repeat(5, 1fr); gap: 8px; }
.svc-logos .logo-tile { margin: 0; border-radius: 10px; aspect-ratio: 3 / 4; }
.svc-text { padding: clamp(22px, 3vw, 36px); display: flex; flex-direction: column; flex: 1; }
.svc-text h2 { font-size: clamp(1.5rem, 2.6vw, 2.125rem); }
.svc-text p { color: var(--ink-soft); margin-top: 12px; }
.svc-text ul { margin: 18px 0 24px; }
.svc-text li { position: relative; padding: 6px 0 6px 22px; font-size: 1rem; }
.svc-text li::before { content: ""; position: absolute; left: 2px; top: calc(6px + .5lh - 3px); width: 6px; height: 6px; border-radius: 50%; background: var(--spark); }
.svc-text .link { margin-top: auto; align-self: flex-start; }
@media (max-width: 860px) { .svc-cards { grid-template-columns: 1fr; } }
.duo { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(40px, 6vw, 96px); }
.duo > div > h3 { font-size: clamp(1.375rem, 2.2vw, 1.75rem); margin-bottom: 20px; }
@media (max-width: 860px) { .duo { grid-template-columns: 1fr; } }
ol.rows.numbered { counter-reset: n; }
ol.rows.numbered > li { counter-increment: n; position: relative; padding-left: 52px; }
ol.rows.numbered > li::before { content: counter(n); position: absolute; left: 0; top: 18px; font-size: 1.75rem; font-weight: 700; color: var(--spark); letter-spacing: -0.03em; line-height: 1.2; font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, Arial, sans-serif; }
.rows h4 { font-size: 1.0625rem; letter-spacing: -0.01em; line-height: 1.35; margin-bottom: 4px; }
html[lang="zh-CN"] .rows h4 { letter-spacing: 0; }
.h3-lg { font-size: clamp(1.375rem, 2.2vw, 1.75rem); }
.cols-4 .col h3 { font-size: 1.1875rem; }
.compare { border-top: 2px solid var(--ink); }
.compare-row { display: grid; grid-template-columns: 1fr 1.3fr 1.3fr; gap: 16px 28px; padding: 20px 0; border-bottom: 1px solid var(--line); align-items: baseline; }
.compare-head { font-weight: 700; font-size: 1.0625rem; }
.compare-head span:last-child, .compare-row span:last-child { color: var(--ink); }
.compare-row span { color: var(--ink-soft); }
.compare-row span:last-child { font-weight: 600; }
@media (max-width: 640px) { .compare-row { grid-template-columns: 1fr 1fr; } .compare-row b, .compare-head span:first-child { grid-column: 1 / -1; } .compare-head span:first-child { display: none; } }
.hero-shot img { width: 100%; height: auto; border-radius: 18px; box-shadow: 0 30px 60px -28px rgba(27,33,38,.45); }
.page-hero .hero-split { grid-template-columns: minmax(0, 1fr) minmax(300px, 480px); }
@media (max-width: 860px) { .page-hero .hero-split { grid-template-columns: 1fr; } }
.case { padding-block: clamp(32px, 4vw, 56px); border-top: 1px solid var(--line); }
.case:first-of-type { border-top: 2px solid var(--ink); }
.case-head h3 { font-size: clamp(1.5rem, 2.6vw, 2.125rem); letter-spacing: -0.03em; }
.case-head .where { color: var(--ink-faint); font-size: 0.9375rem; margin-bottom: 6px; }
.case-head { margin-bottom: 24px; }
.case .strip { background: #0c0c0d; border-color: #0c0c0d; }
.case .strip img { min-width: 720px; border-radius: 10px; }
.case-body { display: grid; grid-template-columns: 1.3fr 1fr; gap: clamp(24px, 4vw, 64px); margin: 28px 0 8px; }
.case-body p { color: var(--ink-soft); }
.case .figures { margin-top: 36px; padding-top: 32px; border-top: 1px solid var(--line); }
@media (max-width: 760px) { .case-body { grid-template-columns: 1fr; } }
.field select { font: inherit; font-size: 1rem; color: var(--ink); background: #fff; border: 1px solid #c9d0d8; border-radius: 12px; padding: 13px 15px; min-height: 50px; width: 100%; }
.field select:focus { outline: 0; border-color: var(--ink); box-shadow: 0 0 0 3px rgba(27,33,38,.12); }
.figures-2 { gap: 40px clamp(24px, 4vw, 56px); }
/* mobile: a contact button that stays within reach */
.sticky-cta { display: none; }
@media (max-width: 860px) {
  .sticky-cta { display: flex; position: fixed; left: 16px; right: 16px; bottom: calc(12px + env(safe-area-inset-bottom)); z-index: 40; align-items: center; justify-content: center; min-height: 52px; border-radius: 999px; background: var(--spark-ink); color: #fff; font-weight: 600; text-decoration: none; box-shadow: 0 12px 30px -8px rgba(27,33,38,.5); transform: translateY(140%); transition: transform .3s; }
  .sticky-cta.show { transform: none; }
  .site-footer { padding-bottom: 110px; }
}
/* click-to-zoom images */
img[data-zoom] { cursor: zoom-in; }
.lightbox { position: fixed; inset: 0; z-index: 100; background: rgba(12,12,13,.92); display: flex; align-items: center; justify-content: center; padding: 20px; overflow: auto; cursor: zoom-out; }
.lightbox img { max-width: none; width: auto; height: auto; max-height: none; border-radius: 8px; }
.lightbox.fit img { max-width: 100%; max-height: 100%; }
.lightbox button { position: fixed; top: 14px; right: 14px; width: 44px; height: 44px; border-radius: 50%; border: 0; background: #fff; color: #111; font-size: 24px; line-height: 1; cursor: pointer; }
.nb { display: inline-block; }