/* 推广页。和产品同一套:暖纸白 + 深松绿 + 宋体 / 明朝标题。 */
:root {
  --paper: #F4EFE4; --paper-2: #ECE5D6; --card: #FFFDF8; --ink: #1D1A15; --ink-2: #4A433A; --ink-3: #675F53; --line: #E2D9C8; --line-2: #CFC4AF;
  --pine: #0E3B2C; --pine-2: #0A2C21; --green: #1C6A4B; --green-hover: #155A3F; --green-soft: #E0ECE4; --mint: #CFE3D6; --mint-2: #9CC4AE; --muted: #B5C7BC;
  --sans: "Hiragino Sans", "PingFang SC", "Hiragino Kaku Gothic ProN", "Noto Sans CJK SC", "Noto Sans CJK JP", "Microsoft YaHei", system-ui, sans-serif;
  --serif: "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", "STSong", serif;
  --wrap: 1180px; --gutter: clamp(20px, 5vw, 64px); --logo-ink: #FFFDF8;
}
:root[data-lang="ja"] { --serif: "Hiragino Mincho ProN", "Noto Serif CJK JP", "Source Han Serif JP", "Yu Mincho", serif; --sans: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans CJK JP", "Yu Gothic UI", "Meiryo", system-ui, sans-serif; }
:root[data-lang="zh"] .ja, :root[data-lang="ja"] .zh { display: none !important; }
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 84px; }
body { margin: 0; font: 17px/1.8 var(--sans); letter-spacing: .03em; color: var(--ink); background: var(--paper); -webkit-font-smoothing: antialiased; }
::selection { background: var(--green-soft); color: var(--pine); }
:focus-visible { outline: 3px solid #7FB79A; outline-offset: 3px; border-radius: 8px; }
img { display: block; max-width: 100%; height: auto; }
a { color: var(--green); }
button { font: inherit; color: inherit; cursor: pointer; letter-spacing: inherit; }
.wrap { width: min(100% - 2 * var(--gutter), var(--wrap)); margin-inline: auto; }
.h2 { margin: 0 0 clamp(40px, 6vw, 72px); font: 700 clamp(30px, 4vw, 48px)/1.35 var(--serif); letter-spacing: .03em; max-width: 18em; }
.lede { margin: 22px 0 0; font-size: clamp(16px, 1.4vw, 19px); line-height: 1.85; max-width: 32em; }
.center { justify-content: center; }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 48px; padding: 0 22px; border-radius: 14px; border: 1.5px solid transparent; font-size: 16px; font-weight: 700; text-decoration: none; white-space: nowrap; transition: background-color .15s, transform .12s; }
.btn:active { transform: scale(.98); }
.btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.btn.primary { background: var(--green); color: #fff; box-shadow: inset 0 1px 0 rgb(255 255 255 / .14), 0 12px 24px -14px rgb(0 0 0 / .6); }
.btn.primary:hover { background: var(--green-hover); }
.btn.ghost { border-color: currentColor; color: inherit; background: transparent; }
.btn.ghost:hover { background: rgb(255 255 255 / .08); }
.btn.xl { min-height: 60px; padding: 0 28px; font-size: 18px; border-radius: 16px; }
.btn.sm { min-height: 42px; padding: 0 16px; font-size: 15px; }

/* 顶栏 */
.hd { position: fixed; inset: 0 0 auto; z-index: 20; color: var(--paper); transition: background-color .25s, color .25s, box-shadow .25s; }
.hd .wrap { display: flex; align-items: center; gap: 28px; min-height: 72px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: inherit; text-decoration: none; font-size: 20px; font-weight: 700; letter-spacing: .01em; }
.brand svg { width: 30px; height: 30px; color: var(--mint); --logo-ink: var(--pine); }
.hd nav { margin-left: auto; display: flex; gap: 26px; }
.hd nav a { color: inherit; text-decoration: none; font-size: 15px; font-weight: 700; opacity: .85; } .hd nav a:hover { opacity: 1; }
.lang { display: flex; padding: 4px; border-radius: 12px; background: rgb(255 255 255 / .1); }
.lang button { min-height: 34px; padding: 0 12px; border: 0; border-radius: 9px; background: transparent; color: inherit; opacity: .75; font-size: 14px; font-weight: 700; }
.lang button.on { background: var(--paper); color: var(--pine); opacity: 1; }
.hd.solid { background: rgb(244 239 228 / .95); color: var(--ink); box-shadow: 0 1px 0 var(--line); backdrop-filter: saturate(1.2) blur(8px); }
.hd.solid .brand svg { color: var(--green); --logo-ink: #FFFDF8; }
.hd.solid .lang { background: var(--paper-2); }
.hd.solid .lang button.on { background: var(--card); color: var(--green); }

/* 首屏:深松绿,左字右两部真手机 */
.hero { position: relative; overflow: hidden; color: var(--paper); background: radial-gradient(900px 520px at 78% 30%, #1E5E46 0%, rgb(30 94 70 / 0) 70%), linear-gradient(180deg, var(--pine) 0%, var(--pine-2) 100%); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); align-items: center; gap: 48px; min-height: max(760px, 100svh); padding: 120px 0 64px; }
.hero h1 { margin: 0; font: 700 clamp(34px, 4.3vw, 62px)/1.3 var(--serif); letter-spacing: .03em; }
.hero h1 .ln { display: inline-block; white-space: nowrap; }
:root[data-lang="ja"] .hero h1 { font-size: clamp(30px, 3.7vw, 54px); }
.hero .lede { color: #DCE6DF; }
.cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 38px; }
.facts { display: flex; flex-wrap: wrap; gap: 8px 22px; margin: 26px 0 0; padding: 0; list-style: none; font-size: 15px; color: var(--muted); }
.facts li { display: inline-flex; align-items: center; gap: 8px; } .facts li::before { content: ""; width: 14px; height: 8px; border-left: 2px solid var(--mint-2); border-bottom: 2px solid var(--mint-2); transform: rotate(-45deg) translateY(-2px); }
.hero-phones { position: relative; height: 640px; }
.ph { margin: 0; }
.ph img { width: 100%; border-radius: 30px; border: 8px solid #070C0A; box-shadow: 0 0 0 1px rgb(255 255 255 / .06), 0 40px 70px -30px rgb(0 0 0 / .75); background: var(--paper); }
.hero-phones .ph { position: absolute; width: 290px; }
.hero-phones .front { right: 10%; top: 8px; transform: rotate(2.5deg); z-index: 2; }
.hero-phones .back { right: calc(10% + 220px); top: 70px; transform: rotate(-5deg); opacity: .96; }
.hero-phones figcaption { position: absolute; top: -14px; left: 50%; transform: translateX(-50%); padding: 4px 14px; border-radius: 99px; background: var(--paper); color: var(--pine); font-size: 13px; font-weight: 700; letter-spacing: .1em; box-shadow: 0 8px 18px -10px rgb(0 0 0 / .6); z-index: 3; }

/* 区块 */
.sec { padding: clamp(96px, 12vw, 160px) 0; }
.step { display: grid; grid-template-columns: minmax(0, 1.25fr) 230px minmax(0, 1fr); gap: clamp(20px, 3vw, 40px); align-items: center; }
.step + .step { margin-top: clamp(72px, 9vw, 120px); }
.step.flip { grid-template-columns: minmax(0, 1fr) 230px minmax(0, 1.25fr); }
.step.flip .txt { order: -1; } .step.flip:not(.duo) .pic { order: 1; }
.step.duo { grid-template-columns: minmax(0, 1fr) 230px 230px; }
.step .pic { border-radius: 22px; overflow: hidden; aspect-ratio: 4 / 3.2; background: var(--paper-2); }
.step .pic img { width: 100%; height: 100%; object-fit: cover; }
.step .ph img { border-width: 6px; border-radius: 26px; box-shadow: 0 30px 50px -28px rgb(29 26 21 / .55); }
.txt .no { display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; border: 1.5px solid var(--green); color: var(--green); font: 700 20px var(--serif); margin-bottom: 18px; }
.txt h3 { margin: 0; font: 700 clamp(24px, 2.4vw, 32px)/1.45 var(--serif); letter-spacing: .03em; }
.txt p { margin: 16px 0 0; color: var(--ink-2); font-size: 16px; }

.why { background: var(--card); border-block: 1px solid var(--line); }
.why-list { display: grid; grid-template-columns: repeat(3, 1fr); }
.why-list > div { padding: 6px 32px 6px 0; }
.why-list > div + div { padding-left: 32px; border-left: 1px solid var(--line); }
.why-list h3 { margin: 0 0 12px; font: 700 24px/1.45 var(--serif); }
.why-list p { margin: 0; color: var(--ink-2); font-size: 16px; }

.price .h2 { margin-bottom: 0; } .price .lede { color: var(--ink-3); margin-bottom: 44px; font-size: 15px; }
.plans { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; max-width: 920px; }
.plan { padding: clamp(28px, 4vw, 40px); border-radius: 24px; background: var(--card); border: 1px solid var(--line); }
.plan h3 { margin: 0; font: 700 22px var(--serif); } .plan h3 em { font-style: normal; font: 700 12px var(--sans); padding: 3px 10px; margin-left: 6px; border-radius: 99px; background: rgb(255 255 255 / .12); vertical-align: .3em; }
.plan .p { margin: 8px 0 22px; font: 700 52px/1.1 var(--serif); letter-spacing: 0; } .plan .p small { font: 700 15px var(--sans); margin-left: 6px; color: var(--ink-3); }
.plan.dark { background: var(--pine); color: var(--paper); border-color: var(--pine); } .plan.dark .p small { color: var(--muted); }
.ticks { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; font-size: 16px; }
.ticks li { position: relative; padding-left: 28px; }
.ticks li::before { content: ""; position: absolute; left: 3px; top: .55em; width: 12px; height: 6px; border-left: 2px solid var(--green); border-bottom: 2px solid var(--green); transform: rotate(-45deg); }
.plan.dark .ticks li::before { border-color: var(--mint-2); }

.faq { display: grid; grid-template-columns: minmax(0, .7fr) minmax(0, 1.3fr); gap: 48px; }
.faq .h2 { margin: 0; }
details { border-top: 1px solid var(--line-2); padding: 22px 0; } details:last-child { border-bottom: 1px solid var(--line-2); }
summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; gap: 16px; font: 700 19px/1.5 var(--serif); }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; font: 400 26px/1 var(--sans); color: var(--green); }
details[open] summary::after { content: "−"; }
details p { margin: 12px 0 0; max-width: 36em; color: var(--ink-2); font-size: 16px; }

.end { background: var(--pine); color: var(--paper); text-align: center; }
.end .h2 { margin-inline: auto; margin-bottom: 40px; }
footer { padding: 44px 0 56px; background: var(--paper-2); font-size: 13px; color: var(--ink-3); }
footer .wrap { display: grid; grid-template-columns: auto 1fr; gap: 28px; align-items: start; }
footer .brand { color: var(--ink); font-size: 17px; } footer .brand svg { width: 24px; height: 24px; color: var(--green); --logo-ink: #FFFDF8; }
footer p { margin: 0; max-width: 52em; line-height: 1.8; }

@media (max-width: 980px) {
  .hd nav { display: none; }
  .hd .wrap { gap: 12px; } .hd .lang { margin-left: auto; }
  .hero-grid { grid-template-columns: 1fr; gap: 24px; min-height: 0; padding: 104px 0 56px; }
  .hero-phones { height: 520px; max-width: 460px; width: 100%; margin: 12px auto 0; }
  .hero-phones .ph { width: 230px; } .hero-phones .front { right: 4%; } .hero-phones .back { right: auto; left: 4%; }
  .step, .step.flip, .step.duo { grid-template-columns: 1fr; gap: 24px; }
  .step.flip .txt { order: 0; } .step.flip:not(.duo) .pic { order: 0; }
  .step .txt { order: -1; }
  .step .ph { width: min(260px, 70%); justify-self: center; }
  .step.duo { grid-template-columns: 1fr 1fr; } .step.duo .txt { grid-column: 1 / -1; } .step.duo .ph { width: 100%; }
  .why-list { grid-template-columns: 1fr; } .why-list > div, .why-list > div + div { padding: 22px 0; border-left: 0; border-top: 1px solid var(--line); }
  .plans, .faq { grid-template-columns: 1fr; }
  footer .wrap { grid-template-columns: 1fr; gap: 12px; }
}
@media (max-width: 520px) {
  .hd .btn.sm { display: none; }
  .hero-phones { height: 440px; } .hero-phones .ph { width: 200px; }
  .cta .btn { width: 100%; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .btn { transition: none; } }