/* Versioned light editorial product page — no dark mesh / no card grid.
   References: product-first light sites (Apple-like whitespace,
   Basecamp simplicity, bold type + large product shots). */

:root {
  --bg: #f6f5f2;
  --bg-soft: #efeee9;
  --ink: #121212;
  --muted: #5f5c56;
  --line: rgba(18, 18, 18, 0.1);
  --accent: #1c4d7a;
  --accent-hover: #163d61;
  --shot-shadow: 0 1px 0 rgba(18, 18, 18, 0.04), 0 24px 48px rgba(18, 18, 18, 0.08);
  --max: 1120px;
  --wide: 1280px;
  --font: "Instrument Sans", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

/* —— Top bar —— */
.top {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 28px;
  background: rgba(246, 245, 242, 0.86);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
}

.top.scrolled,
body:not(.no-js) .top {
  border-bottom-color: var(--line);
}

.logo {
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: -0.02em;
}

.logo span {
  margin-left: 0.25em;
  color: var(--muted);
  font-weight: 500;
}

.top nav {
  display: flex;
  align-items: center;
  gap: 6px 18px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.top nav a {
  font-size: 0.9rem;
  color: var(--muted);
  padding: 6px 2px;
}

.top nav a:hover {
  color: var(--ink);
}

.top-cta {
  color: #fff !important;
  background: var(--ink);
  padding: 8px 14px !important;
  border-radius: 999px;
  font-weight: 600;
}

.top-cta:hover {
  background: #000;
}

/* —— Hero —— */
.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 72px 28px 28px;
  text-align: center;
}

.kicker {
  margin: 0 0 18px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero h1 {
  margin: 0 auto 22px;
  max-width: 16ch;
  font-size: clamp(2.15rem, 5.2vw, 3.6rem);
  line-height: 1.12;
  letter-spacing: -0.035em;
  font-weight: 700;
}

.sub {
  margin: 0 auto 28px;
  max-width: 40rem;
  color: var(--muted);
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.btn-solid {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.15s ease;
}

.btn-solid:hover {
  background: var(--accent-hover);
}

.btn-text {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--muted);
  border-bottom: 1px solid transparent;
}

.btn-text:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* Product shot: light stage, soft elevation — the “premium” cue */
.hero-shot {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 12px 28px 8px;
}

.shot {
  margin: 0;
  border-radius: 18px;
  overflow: hidden;
  background: #ececec;
  box-shadow: var(--shot-shadow);
  border: 1px solid rgba(18, 18, 18, 0.06);
}

.shot img {
  width: 100%;
  aspect-ratio: 1440 / 900;
  object-fit: cover;
  background: #ececec;
}

.shot video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: contain;
  background: #ececec;
}

.shot figcaption {
  padding: 14px 18px 16px;
  font-size: 0.88rem;
  color: var(--muted);
  background: #fff;
  border-top: 1px solid var(--line);
}

/* —— Proof strip —— */
.strip {
  max-width: var(--max);
  margin: 48px auto 0;
  padding: 28px;
  display: grid;
  gap: 8px;
  text-align: center;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.strip p {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.strip strong {
  color: var(--ink);
  font-weight: 600;
}

/* —— Editorial blocks —— */
.block {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 88px 28px 0;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 40px 48px;
  align-items: center;
}

.block-flip {
  direction: rtl;
}

.block-flip > * {
  direction: ltr;
}

.block-copy .num {
  display: block;
  margin-bottom: 14px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.block-copy h2 {
  margin: 0 0 14px;
  font-size: clamp(1.55rem, 2.6vw, 2.15rem);
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.block-copy p {
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
  max-width: 34rem;
}

.showcase-columns {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 88px 28px 0;
}

.showcase-masonry {
  position: relative;
}

.showcase-masonry > section {
  position: absolute;
  top: 0;
  left: 0;
  min-width: 0;
}

.showcase-columns .block-copy {
  max-width: 34rem;
  margin-bottom: 22px;
}

.showcase-columns .block-copy h2 {
  font-size: 1.75rem;
  letter-spacing: 0;
}

.detail-showcase {
  max-width: 1080px;
  margin: 0 auto;
  padding: 72px 28px 0;
}

.detail-head {
  max-width: 44rem;
  margin-bottom: 56px;
}

.detail-head .num {
  display: block;
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.detail-head h2 {
  margin: 0 0 14px;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  line-height: 1.2;
  letter-spacing: 0;
}

.detail-head p,
.detail-copy p {
  margin: 0;
  color: var(--muted);
}

.detail-list {
  display: grid;
  gap: 72px;
}

.detail-item {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.detail-copy {
  position: sticky;
  top: 88px;
  padding-top: 12px;
}

.detail-copy h3 {
  margin: 0 0 8px;
  font-size: 1.25rem;
  line-height: 1.3;
}

.detail-copy p {
  font-size: 0.94rem;
}

.detail-shot img {
  width: 100%;
  height: clamp(480px, 48vw, 620px);
  aspect-ratio: auto;
  object-fit: contain;
  padding: clamp(18px, 3vw, 40px);
}

.detail-shot-landscape img {
  height: clamp(420px, 44vw, 540px);
}

.detail-video video {
  height: clamp(480px, 48vw, 620px);
  aspect-ratio: auto;
}

/* —— Filmstrip compare —— */
.compare {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 96px 0 0;
}

.compare-head {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px 28px;
}

.compare-head .num {
  display: block;
  margin-bottom: 14px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.compare-head h2 {
  margin: 0 0 12px;
  font-size: clamp(1.55rem, 2.6vw, 2.15rem);
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.compare-head p {
  margin: 0;
  max-width: 40rem;
  color: var(--muted);
}

.film {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(280px, 34vw);
  gap: 16px;
  overflow-x: auto;
  padding: 8px 28px 28px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.film-item {
  margin: 0;
  scroll-snap-align: start;
  border-radius: 14px;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 12px 28px rgba(18, 18, 18, 0.05);
}

.film-item img {
  width: 100%;
  aspect-ratio: 1440 / 900;
  object-fit: cover;
  background: #ececec;
}

.film-item-contain img {
  object-fit: contain;
  padding: 14px;
}

.film-item figcaption {
  padding: 12px 14px 14px;
  font-size: 0.86rem;
  color: var(--muted);
}

/* —— Scope list (not cards) —— */
.scope {
  max-width: var(--max);
  margin: 0 auto;
  padding: 96px 28px 0;
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 40px;
  align-items: start;
}

.scope-left h2 {
  margin: 0 0 12px;
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.scope-left p {
  margin: 0;
  color: var(--muted);
}

.scope-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.scope-list li {
  display: grid;
  grid-template-columns: minmax(8rem, 0.4fr) 1fr;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}

.scope-list strong {
  font-size: 1rem;
  font-weight: 600;
}

.scope-list span {
  color: var(--muted);
  font-size: 0.98rem;
}

/* —— CTA —— */
.get {
  max-width: var(--max);
  margin: 0 auto;
  padding: 100px 28px 72px;
  text-align: center;
}

.get h2 {
  margin: 0 0 16px;
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
  letter-spacing: -0.03em;
}

.get p {
  margin: 0 auto 12px;
  max-width: 36rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.pricing {
  max-width: 22rem;
  margin: 28px auto 8px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.price-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding: 16px 4px;
}

.price-row + .price-row {
  border-top: 1px solid var(--line);
}

.price-term {
  font-size: 1rem;
  color: var(--muted);
  font-weight: 500;
}

.price-value {
  font-size: 1rem;
  color: var(--ink);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.price-value em {
  font-style: normal;
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-right: 2px;
}

.price-save {
  display: inline-block;
  margin-left: 10px;
  font-size: 0.88rem;
  font-weight: 700;
  color: #e67a18;
  letter-spacing: 0.01em;
  vertical-align: middle;
}

.get-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin: 28px 0 36px;
}

.contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 36px 56px;
  margin: 0 auto 28px;
  max-width: 36rem;
  padding: 28px 24px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.contact-wechat {
  text-align: center;
}

.contact-wechat img {
  width: min(220px, 70vw);
  height: auto;
  margin: 0 auto;
  border-radius: 12px;
  background: #fff;
  border: 1px solid var(--line);
}

.contact-wechat p {
  margin: 12px 0 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.contact-mail {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  text-align: left;
}

.contact-label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.contact-mail a {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--accent);
  border-bottom: 1px solid transparent;
}

.contact-mail a:hover {
  border-bottom-color: var(--accent);
}

.get-meta {
  font-size: 0.9rem !important;
  color: #8a857c !important;
}

@media (max-width: 900px) {
  .get-actions {
    justify-content: flex-start;
  }

  .contact {
    justify-content: flex-start;
    align-items: flex-start;
  }
}

/* —— Footer —— */
.foot {
  max-width: var(--max);
  margin: 0 auto;
  padding: 22px 28px 40px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.88rem;
  border-top: 1px solid var(--line);
}

@media (max-width: 900px) {
  .showcase-columns {
    padding-top: 64px;
  }

  .showcase-masonry {
    height: auto !important;
  }

  .showcase-masonry > section {
    position: static;
    width: auto !important;
    padding-bottom: 64px;
    transform: none !important;
  }

  .detail-item {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .detail-copy {
    position: static;
    padding-top: 0;
  }

  .detail-shot img,
  .detail-shot-landscape img,
  .detail-video video {
    height: min(90vw, 680px);
  }

  .block,
  .block-flip,
  .scope {
    grid-template-columns: 1fr;
    direction: ltr;
  }

  .block {
    padding-top: 64px;
    gap: 20px;
  }

  .scope-list li {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .hero {
    padding-top: 48px;
    text-align: left;
  }

  .hero h1 {
    max-width: none;
  }

  .hero-actions {
    justify-content: flex-start;
  }

  .strip {
    text-align: left;
  }

  .get {
    text-align: left;
    padding-top: 72px;
  }
}

@media (max-width: 560px) {
  .showcase-columns {
    padding-left: 16px;
    padding-right: 16px;
  }

  .showcase-columns .block-copy h2 {
    font-size: 1.55rem;
  }

  .detail-showcase {
    padding-left: 16px;
    padding-right: 16px;
  }

  .detail-head {
    margin-bottom: 40px;
  }

  .detail-list {
    gap: 64px;
  }

  .detail-shot img,
  .detail-shot-landscape img,
  .detail-video video {
    height: min(118vw, 620px);
    padding: 14px;
  }

  .top {
    padding: 12px 16px;
  }

  .hero,
  .hero-shot,
  .strip,
  .block,
  .compare-head,
  .scope,
  .get,
  .foot {
    padding-left: 16px;
    padding-right: 16px;
  }

  .film {
    padding-left: 16px;
    padding-right: 16px;
    grid-auto-columns: 78vw;
  }


  .top nav a:not(.top-cta) {
    display: none;
  }
}