/* Resona 官网样式：系统字体、浅色/深色、无外部资源。颜色对比按 WCAG AA 选取（正文 ≥ 4.5:1）。 */

/* ---------- 设计变量 ---------- */
:root {
  color-scheme: light dark;
  --bg: #F5F8F9;
  --bg-soft: #EBF3F5;
  --surface: #FFFFFF;
  --surface-2: #F2F7F8;
  --ink: #13222A;
  --ink-2: #2A3D47;
  --muted: #4B5F69;
  --line: #D4E2E7;
  --line-strong: #9DB6BF;
  --accent: #0E7C86;
  --accent-strong: #0A5D65;
  --accent-soft: #DDF0F1;
  --on-accent: #FFFFFF;
  --focus: #0E7C86;
  --warm: #93421C;
  --warm-soft: #FBEEE5;
  --warm-line: #F0D4C2;
  --free: #22663F;
  --free-soft: #E2F2E8;
  --pro: #0A5D65;
  --pro-soft: #DCEEF1;
  --hero-a: #153D5E;
  --hero-b: #1C6E8C;
  --deep-a: #10283C;
  --deep-b: #153E57;
  --shadow-sm: 0 1px 2px rgba(15, 40, 56, .06), 0 2px 10px rgba(15, 40, 56, .05);
  --shadow: 0 2px 6px rgba(15, 40, 56, .06), 0 16px 36px rgba(15, 40, 56, .10);
  --radius: 20px;
  --radius-sm: 14px;
  --header-h: 64px;
  --gutter: 16px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0A1519;
    --bg-soft: #0E1D23;
    --surface: #12232A;
    --surface-2: #162B33;
    --ink: #E6EFF2;
    --ink-2: #C9D7DD;
    --muted: #A1B4BC;
    --line: #23404A;
    --line-strong: #36575F;
    --accent: #4FC2CA;
    --accent-strong: #8ADBE0;
    --accent-soft: #123A40;
    --on-accent: #032326;
    --focus: #8ADBE0;
    --warm: #F3B693;
    --warm-soft: #2E1F18;
    --warm-line: #4C3326;
    --free: #93D9B0;
    --free-soft: #15322A;
    --pro: #8ADBE0;
    --pro-soft: #123A40;
    --hero-a: #0D2A42;
    --hero-b: #15546F;
    --deep-a: #0A1F2F;
    --deep-b: #0F3146;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .35);
    --shadow: 0 2px 6px rgba(0, 0, 0, .3), 0 18px 40px rgba(0, 0, 0, .38);
  }
}

/* 中日韩与西里尔文字回退 */
:lang(zh-Hans) { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", "Segoe UI", sans-serif; }
:lang(zh-Hant) { font-family: -apple-system, BlinkMacSystemFont, "PingFang TC", "Microsoft JhengHei", "Noto Sans TC", "Source Han Sans TC", "Segoe UI", sans-serif; }
:lang(ko) { font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", "Segoe UI", sans-serif; }
:lang(ru) { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif; }

/* ---------- 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-wrap: anywhere;
}
:lang(zh-Hans) body, :lang(zh-Hant) body, body:lang(zh-Hans), body:lang(zh-Hant) { line-height: 1.8; }
body:lang(ko) { line-height: 1.75; word-break: keep-all; }
img, svg { max-width: 100%; }
img { height: auto; }
h1, h2, h3, h4 { margin: 0; line-height: 1.2; letter-spacing: -.015em; text-wrap: balance; color: var(--ink); }
:lang(zh-Hans) :is(h1, h2, h3, h4), :lang(zh-Hant) :is(h1, h2, h3, h4), :lang(ko) :is(h1, h2, h3, h4) { letter-spacing: 0; line-height: 1.35; }
p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }
a { color: var(--accent-strong); text-underline-offset: .18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
strong { font-weight: 650; }
:where(ul[role="list"], ol[role="list"]) { list-style: none; margin: 0; padding: 0; }
.icon { width: 1.25em; height: 1.25em; flex: none; vertical-align: -.22em; }
.icon--sm { width: 1em; height: 1em; }
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; border: 0;
}
.muted { color: var(--muted); }
.small { font-size: .9375rem; }
.center { text-align: center; }

:focus { outline: none; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 8px; }
.on-dark { --focus: #A6EEF2; }
main:focus { outline: none; }
[id] { scroll-margin-top: calc(var(--header-h) + 20px); }

.container { width: 100%; max-width: 1180px; margin-inline: auto; padding-inline: var(--gutter); }
@media (min-width: 640px) { :root { --gutter: 24px; } }
@media (min-width: 1024px) { :root { --gutter: 32px; } }

.skip-link {
  position: fixed; left: 12px; top: -200px; z-index: 100;
  padding: 12px 18px; border-radius: 12px; background: var(--surface); color: var(--accent-strong);
  font-weight: 700; box-shadow: var(--shadow); text-decoration: none;
}
.skip-link:focus { top: 12px; }

/* ---------- 按钮与徽章 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  min-height: 48px; padding: .65em 1.3em; border-radius: 999px; border: 1px solid transparent;
  font: inherit; font-weight: 650; line-height: 1.25; text-align: center; text-decoration: none; cursor: pointer;
  transition: background-color .2s, border-color .2s, transform .2s, box-shadow .2s;
}
.btn .icon { width: 1.1em; height: 1.1em; }
.btn--sm { min-height: 44px; padding: .45em 1.05em; font-size: .9375rem; }
.btn--primary { background: var(--accent); color: var(--on-accent); }
.btn--primary:hover { background: var(--accent-strong); text-decoration: none; }
@media (prefers-color-scheme: dark) { .btn--primary:hover { background: #6FD2D8; } }
.btn--secondary { background: var(--surface); color: var(--accent-strong); border-color: var(--line-strong); }
.btn--secondary:hover { border-color: var(--accent); text-decoration: none; }
.btn--ghost { color: #fff; border-color: rgba(255, 255, 255, .5); background: rgba(255, 255, 255, .08); }
.btn--ghost:hover { background: rgba(255, 255, 255, .16); text-decoration: none; }
.badge-link { display: inline-flex; border-radius: 10px; line-height: 0; }
.badge-link img { display: block; width: auto; max-width: 100%; }
.badge-link--sm img { height: 44px; }
.badge-link--md img { height: 52px; }
.badge-link--lg img { height: 56px; }
.link-arrow { display: inline-flex; align-items: center; gap: .4em; min-height: 44px; font-weight: 650; text-decoration: none; }
.link-arrow:hover { text-decoration: underline; }
.link-arrow .icon { transition: transform .2s; }
.link-arrow:hover .icon { transform: translateX(3px); }

/* ---------- 页头 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--line);
}
.site-header__bar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; min-height: var(--header-h); }
.brand {
  display: inline-flex; align-items: center; gap: 10px; min-height: 44px; margin-right: auto;
  color: var(--ink); text-decoration: none; font-weight: 750; font-size: 1.125rem; letter-spacing: -.01em;
}
.brand img { width: 36px; height: 36px; border-radius: 9px; box-shadow: var(--shadow-sm); }
.site-nav ul { display: flex; flex-wrap: wrap; gap: 2px; }
.site-nav a {
  display: inline-flex; align-items: center; min-height: 44px; padding: 0 12px; border-radius: 10px;
  color: var(--ink-2); text-decoration: none; font-weight: 560;
}
.site-nav a:hover { background: var(--bg-soft); color: var(--ink); }
.site-nav a[aria-current="page"] { color: var(--accent-strong); background: var(--accent-soft); }
.site-header__tools { display: flex; align-items: center; gap: 8px; }
.nav-toggle {
  display: none; align-items: center; justify-content: center; width: 44px; height: 44px;
  border-radius: 10px; border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink); cursor: pointer;
}
.nav-toggle .icon { width: 22px; height: 22px; }

.lang-switch { position: relative; }
.lang-switch summary {
  display: inline-flex; align-items: center; gap: 6px; min-height: 44px; min-width: 44px; padding: 0 10px;
  border-radius: 10px; border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink-2);
  font-weight: 560; font-size: .9375rem; cursor: pointer; list-style: none; white-space: nowrap;
}
.lang-switch summary::-webkit-details-marker { display: none; }
.lang-switch summary:hover { border-color: var(--accent); }
.lang-switch .icon--sm { transition: transform .2s; }
.lang-switch[open] .icon--sm { transform: rotate(180deg); }
.lang-switch__short { display: none; }
.lang-switch__list {
  position: absolute; right: 0; top: calc(100% + 6px); z-index: 60;
  width: max-content; min-width: 13rem; max-width: calc(100vw - 2 * var(--gutter));
  max-height: min(70vh, 30rem); overflow-y: auto; padding: 6px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow);
}
.lang-switch__list a {
  display: flex; align-items: center; min-height: 44px; padding: 0 14px; border-radius: 9px;
  color: var(--ink); text-decoration: none;
}
.lang-switch__list a:hover { background: var(--bg-soft); }
.lang-switch__list a[aria-current] { font-weight: 700; color: var(--accent-strong); background: var(--accent-soft); }

@media (max-width: 860px) {
  .site-header__cta { display: none; }
  .site-nav { order: 3; flex-basis: 100%; }
  .site-nav ul { padding-bottom: 10px; }
  .js .nav-toggle { display: inline-flex; }
  .js .site-nav { display: none; }
  .js.nav-open .site-nav { display: block; }
  .js .site-nav ul { flex-direction: column; padding: 4px 0 14px; }
  .js .site-nav a { width: 100%; }
}
@media (max-width: 560px) {
  .lang-switch__name { display: none; }
  .lang-switch__short { display: inline; }
  .lang-switch__list { position: fixed; left: var(--gutter); right: var(--gutter); top: calc(var(--header-h) - 2px); width: auto; min-width: 0; max-width: none; }
}

/* ---------- 版块通用 ---------- */
.section { padding-block: clamp(64px, 8vw, 112px); }
.section--tight { padding-block: clamp(32px, 5vw, 64px); }
.section--soft { background: var(--bg-soft); }
.section--warm { background: linear-gradient(180deg, var(--bg) 0%, var(--warm-soft) 100%); }
.section-head { max-width: 47rem; margin: 0 auto clamp(32px, 5vw, 56px); text-align: center; }
.section-head--left { margin-inline: 0; text-align: left; }
.section-head h2, .section h2.faq-group__title { font-size: clamp(1.75rem, 1.2rem + 2vw, 2.6rem); font-weight: 720; }
.subhead { font-size: 1.25rem; margin: clamp(40px, 6vw, 64px) 0 18px; text-align: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; margin: 0 0 12px;
  font-size: .8125rem; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; color: var(--accent-strong);
}
.eyebrow .icon { width: 1.15em; height: 1.15em; }
:lang(zh-Hans) .eyebrow, :lang(zh-Hant) .eyebrow, :lang(ko) .eyebrow { letter-spacing: .04em; font-size: .9rem; }
.lead { margin: 16px 0 0; font-size: clamp(1.0625rem, 1rem + .35vw, 1.2rem); color: var(--muted); }
.note { display: flex; gap: 10px; align-items: flex-start; margin: 24px 0 8px; color: var(--muted); font-size: .975rem; }
.note .icon { color: var(--accent); margin-top: .2em; }

.cards { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 15.5rem), 1fr)); }
.cards--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr)); }
.cards--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr)); }
.cards--spaced { margin-top: clamp(32px, 5vw, 56px); }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow-sm);
}
.card h3 { font-size: 1.125rem; margin: 14px 0 6px; }
.card p { color: var(--muted); font-size: .985rem; }
.card--tinted { background: var(--surface-2); box-shadow: none; }
.card--wide { grid-column: 1 / -1; }
.icon-tile {
  display: inline-grid; place-items: center; width: 44px; height: 44px; flex: none;
  border-radius: 12px; background: var(--accent-soft); color: var(--accent-strong);
}
.icon-tile .icon { width: 24px; height: 24px; }
.icon-tile--lg { width: 56px; height: 56px; border-radius: 16px; }
.icon-tile--lg .icon { width: 30px; height: 30px; }

.tag {
  display: inline-flex; align-items: center; padding: 1px 9px; border-radius: 999px; vertical-align: .12em;
  font-size: .75rem; font-weight: 750; letter-spacing: .03em; line-height: 1.6; white-space: nowrap;
}
.tag--free { background: var(--free-soft); color: var(--free); }
.tag--pro { background: var(--pro-soft); color: var(--pro); }
.tag--review { background: var(--warm-soft); color: var(--warm); }

.callout {
  display: flex; gap: 12px; align-items: flex-start; margin: 28px 0 0; padding: 18px 20px;
  border-radius: var(--radius-sm); background: var(--accent-soft); color: var(--ink);
}
.callout > .icon { color: var(--accent-strong); margin-top: .15em; width: 1.4em; height: 1.4em; }
.callout--warm { display: block; background: var(--surface); border: 1px solid var(--warm-line); border-left: 5px solid var(--warm); }
.callout__title { display: flex; gap: 8px; align-items: center; margin: 0 0 6px; font-weight: 700; color: var(--warm); }
.callout--warm p:not(.callout__title) { color: var(--ink-2); }

/* 左右分栏：手机截图 + 内容 */
.split { display: grid; gap: clamp(32px, 6vw, 72px); align-items: center; grid-template-columns: minmax(0, 300px) minmax(0, 1fr); }
.split--rev { grid-template-columns: minmax(0, 1fr) minmax(0, 300px); }
.split--wide-visual.split--rev { grid-template-columns: minmax(0, 1fr) minmax(0, 420px); }
.split--hero { grid-template-columns: minmax(0, 1fr) minmax(0, 280px); }
.split__visual { display: flex; justify-content: center; }
@media (max-width: 900px) {
  .split, .split--rev, .split--wide-visual.split--rev, .split--hero { grid-template-columns: minmax(0, 1fr); }
  .split__visual { order: 2; }
}

/* ---------- CSS 手机外框 ---------- */
.phone {
  position: relative; margin: 0; width: min(288px, calc(100% - 8px));
  padding: 9px; border-radius: 46px;
  background: linear-gradient(150deg, #34424C 0%, #10171C 45%, #222D35 100%);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .12), 0 28px 56px -24px rgba(6, 24, 38, .55), 0 10px 22px -14px rgba(6, 24, 38, .45);
}
.phone::before, .phone::after { content: ""; position: absolute; width: 3px; border-radius: 3px; background: #2A353D; }
.phone::before { right: -3px; top: 24%; height: 11%; }
.phone::after { left: -3px; top: 19%; height: 7%; box-shadow: 0 calc(46px + 2vw) 0 #2A353D; }
.phone__screen { overflow: hidden; border-radius: 38px; background: #000; aspect-ratio: 600 / 1304; }
.phone__screen img { display: block; width: 100%; height: 100%; object-fit: cover; }
.phone-pair { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; align-items: start; padding-inline: 3px; }
.phone-pair .phone { width: 100%; }
.phone-pair .phone--tilt-r { margin-top: 48px; }

/* ---------- 首页主视觉 ---------- */
.hero {
  position: relative; overflow: hidden; color: #fff;
  background:
    radial-gradient(900px 520px at 92% -12%, rgba(79, 194, 202, .18), transparent 62%),
    radial-gradient(760px 480px at -12% 112%, rgba(246, 178, 140, .16), transparent 62%),
    linear-gradient(150deg, var(--hero-a) 0%, var(--hero-b) 100%);
}
.hero__wave { position: absolute; inset: auto 0 0 0; width: 100%; height: 18%; pointer-events: none; }
.hero__band { fill: rgba(166, 238, 242, .07); }
.hero__trace { fill: none; stroke: rgba(166, 238, 242, .32); stroke-width: 3; stroke-linecap: round; vector-effect: non-scaling-stroke; }
.hero__grid {
  position: relative; display: grid; gap: clamp(40px, 6vw, 64px); align-items: center;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  padding-block: clamp(48px, 7vw, 96px) clamp(56px, 7vw, 96px);
}
.hero .eyebrow { color: #C6F4F6; }
.hero__title { color: #fff; font-size: clamp(2.15rem, 1.35rem + 3.3vw, 3.7rem); font-weight: 760; letter-spacing: -.025em; }
:lang(zh-Hans) .hero__title, :lang(zh-Hant) .hero__title, :lang(ko) .hero__title { letter-spacing: 0; }
.hero__lead { margin: 20px 0 0; max-width: 35em; font-size: clamp(1.0625rem, 1rem + .45vw, 1.25rem); color: rgba(255, 255, 255, .95); }
.hero__actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 18px; margin-top: 32px; }
.hero__note { margin-top: 22px; font-size: .9375rem; color: rgba(255, 255, 255, .92); }
.hero__visual { position: relative; display: grid; place-items: center; min-height: 0; }
.hero__visual .phone { grid-area: 1 / 1; width: min(270px, calc(100% - 8px)); }
.phone--back { transform: translate(-36%, 5%) rotate(-7deg) scale(.88); opacity: .92; }
.phone--front { transform: translate(20%, 0) rotate(2.5deg); }
.screens-note { margin: -28px 0 28px; font-size: .875rem; color: rgba(255, 255, 255, .92); text-align: right; }
@media (max-width: 900px) {
  .hero__grid { grid-template-columns: minmax(0, 1fr); }
  .phone--back { display: none; }
  .phone--front { transform: none; }
  .screens-note { text-align: center; margin-top: -40px; }
}
@media (prefers-reduced-motion: no-preference) {
  .hero__trace { stroke-dasharray: 2600; stroke-dashoffset: 2600; animation: draw 2.6s .2s ease-out forwards; }
  .card, .tool, .week { transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease; }
  .card:hover, .week:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
}
@keyframes draw { to { stroke-dashoffset: 0; } }

/* 信任条 */
.trust { background: var(--surface); border-bottom: 1px solid var(--line); }
.trust__list { display: grid; gap: 4px 28px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr)); padding-block: 28px; }
.trust__item { display: flex; gap: 14px; align-items: flex-start; padding: 10px 0; }
.trust__title { margin: 2px 0 2px; font-weight: 700; color: var(--ink); }
.trust__item p:not(.trust__title) { color: var(--muted); font-size: .95rem; }

/* 课程（首页） */
.paths { display: grid; gap: 14px; }
.path-card {
  display: flex; gap: 16px; align-items: flex-start; padding: 20px 22px;
  background: var(--surface); border: 1px solid var(--line); border-left: 5px solid var(--accent);
  border-radius: var(--radius); box-shadow: var(--shadow-sm);
}
.path-card--masc { border-left-color: #3E63A8; }
.path-card--masc .icon-tile { background: #E3EAF7; color: #2C4F8F; }
@media (prefers-color-scheme: dark) { .path-card--masc { border-left-color: #8EAEEA; } .path-card--masc .icon-tile { background: #1B2A45; color: #B5CBF3; } }
.path-card--custom { border-left-style: dashed; border-left-color: var(--line-strong); }
.path-card h3 { font-size: 1.1875rem; margin: 4px 0 4px; }
.path-card p { color: var(--muted); }
.stage-cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr)); }
.stage-card {
  display: flex; gap: 14px; align-items: flex-start; padding: 20px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
}
.stage-card__num {
  display: grid; place-items: center; flex: none; width: 40px; height: 40px; border-radius: 50%;
  background: var(--accent); color: var(--on-accent); font-weight: 800;
}
.stage-card__weeks { margin: 0; font-size: .8125rem; font-weight: 750; letter-spacing: .06em; text-transform: uppercase; color: var(--accent-strong); }
.stage-card__title { font-size: 1.1875rem; margin: 2px 0 4px; }
.stage-card__sub { color: var(--muted); }
.course-facts { max-width: 46rem; margin: 32px auto 0; text-align: center; }
.course-facts__line { font-weight: 650; color: var(--ink-2); }
.pill-note { display: inline-flex; gap: 8px; align-items: center; padding: 10px 16px; border-radius: 999px; text-align: left; }
.pill-note--free { background: var(--free-soft); color: var(--free); }
.pill-note--free strong { color: inherit; }

/* 隐私（深色带） */
.section--deep { color: #E6F1F4; background: radial-gradient(700px 420px at 100% 0%, rgba(79, 194, 202, .16), transparent 60%), linear-gradient(160deg, var(--deep-a), var(--deep-b)); }
.section--deep h2 { color: #fff; }
.section--deep .eyebrow { color: #A6EEF2; }
.section--deep .lead { color: rgba(230, 241, 244, .86); }
.section--deep a { color: #A6EEF2; }
.privacy-band { display: grid; gap: clamp(32px, 6vw, 72px); grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); align-items: start; }
@media (max-width: 860px) { .privacy-band { grid-template-columns: minmax(0, 1fr); } }
.privacy-band__intro h2 { font-size: clamp(1.75rem, 1.2rem + 2vw, 2.6rem); font-weight: 720; }
.privacy-band__mark {
  display: grid; place-items: center; width: 64px; height: 64px; margin-bottom: 20px; border-radius: 18px;
  background: rgba(166, 238, 242, .12); color: #A6EEF2; box-shadow: inset 0 0 0 1px rgba(166, 238, 242, .25);
}
.privacy-band__mark .icon { width: 34px; height: 34px; }
.privacy-band__list { display: grid; gap: 12px; }
.privacy-band__list li {
  display: flex; gap: 14px; align-items: flex-start; padding: 16px 18px; border-radius: 16px;
  background: rgba(255, 255, 255, .06); box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .1);
}
.privacy-band__list .icon { color: #A6EEF2; margin-top: .15em; }

/* 护嗓 */
.icon-list { display: grid; gap: 12px; margin-top: 8px; }
.icon-list li { display: flex; gap: 12px; align-items: flex-start; }
.icon-list .icon { color: var(--accent); margin-top: .2em; }

/* 价格 */
.plans { display: grid; gap: 20px; max-width: 900px; margin-inline: auto; grid-template-columns: repeat(auto-fit, minmax(min(100%, 19rem), 1fr)); }
.plan { padding: clamp(22px, 3vw, 32px); background: var(--surface); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow-sm); }
.plan--pro {
  border: 2px solid var(--accent);
  background: linear-gradient(180deg, var(--accent-soft) 0%, var(--surface) 42%);
  box-shadow: var(--shadow);
}
.plan__name { font-size: 1.5rem; }
.plan__sub { margin: 4px 0 18px; font-weight: 650; color: var(--accent-strong); }
.checks { display: grid; gap: 10px; }
.checks li { display: flex; gap: 10px; align-items: flex-start; }
.checks .icon { color: var(--accent); margin-top: .2em; }
.plans-notes { max-width: 46rem; margin: 24px auto 0; text-align: center; color: var(--muted); font-size: .975rem; }
.plans-notes p { margin-bottom: .5em; }
.compare { max-width: 900px; margin: 28px auto 0; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); }
.compare > summary {
  display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 56px; padding: 12px 20px;
  font-weight: 700; color: var(--accent-strong); cursor: pointer; list-style: none; border-radius: 18px;
}
.compare > summary::-webkit-details-marker { display: none; }
.compare > summary .icon { transition: transform .2s; }
.compare[open] > summary .icon { transform: rotate(180deg); }
.compare__body { padding: 0 20px 20px; }
.compare-table { width: 100%; border-collapse: collapse; font-size: .975rem; }
.compare-table th, .compare-table td { padding: 12px 10px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
.compare-table thead th { font-size: .875rem; color: var(--muted); font-weight: 700; }
.compare-table thead th:last-child, .compare-table td:last-child { color: var(--accent-strong); font-weight: 600; }
.compare-table th[scope="row"] { font-weight: 600; }
.compare-table td .icon { color: var(--accent); }
.compare-table td:first-of-type .icon { color: var(--muted); }
@media (max-width: 560px) {
  .compare-table thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
  .compare-table tr { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 2px 12px; padding: 12px 0; border-bottom: 1px solid var(--line); }
  .compare-table th, .compare-table td { padding: 0; border: 0; }
  .compare-table th[scope="row"] { grid-column: 1 / -1; margin-bottom: 4px; }
  .compare-table td::before { content: attr(data-label) ": "; color: var(--muted); font-weight: 600; }
}

/* 语言 */
.section--langs { padding-block: clamp(48px, 6vw, 80px); }
.langs-card {
  display: flex; gap: 20px; align-items: flex-start; max-width: 860px; margin-inline: auto; padding: clamp(22px, 4vw, 40px);
  background: var(--surface); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow-sm);
}
.langs-card h2 { font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2rem); margin-bottom: 10px; }
@media (max-width: 560px) { .langs-card { flex-direction: column; } }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 18px; }
.chips li { padding: 8px 16px; border-radius: 999px; border: 1px solid var(--line-strong); background: var(--surface-2); font-weight: 650; }

/* 常见问题 */
.faq-list { display: grid; gap: 12px; max-width: 860px; margin-inline: auto; }
.faq { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; }
.faq > summary {
  display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 56px; padding: 14px 20px;
  font-weight: 650; cursor: pointer; list-style: none; border-radius: 16px;
}
.faq > summary::-webkit-details-marker { display: none; }
.faq > summary .icon { color: var(--accent); transition: transform .2s; }
.faq[open] > summary .icon { transform: rotate(180deg); }
.faq[open] { border-color: var(--line-strong); }
.faq__a { padding: 0 20px 18px; color: var(--ink-2); }
.section .center { margin-top: 32px; }

/* 结尾行动 */
.cta-band {
  color: #fff; text-align: center;
  background: radial-gradient(700px 360px at 50% 0%, rgba(79, 194, 202, .28), transparent 65%), linear-gradient(150deg, var(--hero-a), var(--hero-b));
}
.cta-band__inner { display: flex; flex-direction: column; align-items: center; gap: 16px; padding-block: clamp(56px, 8vw, 96px); }
.cta-band h2 { color: #fff; font-size: clamp(1.75rem, 1.2rem + 2vw, 2.5rem); }
.cta-band p { max-width: 38rem; color: rgba(255, 255, 255, .95); margin: 0 0 8px; }
.cta-band__icon { width: 72px; height: 72px; border-radius: 18px; box-shadow: 0 10px 30px rgba(0, 0, 0, .3); }

/* ---------- 内页主视觉与目录 ---------- */
.page-hero {
  padding-block: clamp(48px, 7vw, 88px);
  background: radial-gradient(800px 380px at 100% 0%, var(--accent-soft), transparent 70%), var(--bg-soft);
  border-bottom: 1px solid var(--line);
}
.page-hero--compact { padding-block: clamp(36px, 5vw, 60px); }
.page-hero h1 { font-size: clamp(2rem, 1.3rem + 2.8vw, 3.25rem); font-weight: 760; max-width: 22em; }
.page-hero .lead { max-width: 44rem; }
.updated { margin: 10px 0 0; color: var(--muted); font-weight: 600; }
.toc { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; }
.toc a {
  display: inline-flex; align-items: center; min-height: 44px; padding: 0 16px; border-radius: 999px;
  border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink-2); font-weight: 600; text-decoration: none;
}
.toc a:hover { border-color: var(--accent); color: var(--accent-strong); }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 10rem), 1fr)); gap: 10px; margin-top: 28px; }
.stats li { display: flex; gap: 10px; align-items: center; padding: 12px 14px; border-radius: 14px; background: var(--surface); border: 1px solid var(--line); color: var(--ink-2); }
.stats .icon { color: var(--accent); }
.stats strong { font-size: 1.125rem; color: var(--ink); }

/* 步骤与定义 */
.steps { display: grid; gap: 14px; }
.steps li { display: flex; gap: 16px; align-items: flex-start; padding: 18px 20px; background: var(--surface); border: 1px solid var(--line); border-radius: 18px; }
.steps__num {
  display: grid; place-items: center; flex: none; width: 36px; height: 36px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent-strong); font-weight: 800;
}
.steps h3 { font-size: 1.125rem; margin: 4px 0 4px; }
.steps p { color: var(--muted); }
.defs { display: grid; gap: 14px; margin: 0; grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr)); }
.def { padding: 18px 20px; border-radius: 18px; background: var(--surface); border: 1px solid var(--line); }
.def dt { font-weight: 700; margin-bottom: 4px; }
.def dd { margin: 0; color: var(--muted); }

/* 工具分组 */
.tool-group { margin-top: clamp(40px, 6vw, 64px); }
.tool-group__title { display: flex; align-items: center; gap: 10px; font-size: 1.375rem; margin-bottom: 16px; }
.tool-group__title .icon { color: var(--accent); width: 1.3em; height: 1.3em; }
.tool-group--with-phone { display: grid; gap: 32px; grid-template-columns: minmax(0, 1fr) minmax(0, 250px); align-items: start; }
.tool-group__phone { display: flex; justify-content: center; padding-top: 52px; }
@media (max-width: 900px) { .tool-group--with-phone { grid-template-columns: minmax(0, 1fr); } .tool-group__phone { display: none; } }
.tools { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(min(100%, 16.5rem), 1fr)); }
.tool { padding: 16px 18px; background: var(--surface); border: 1px solid var(--line); border-radius: 16px; }
.tool__name { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 8px; margin: 0 0 4px; font-size: 1.0625rem; }
.tool p { color: var(--muted); font-size: .975rem; }

/* 课程页 */
.stage { margin-top: clamp(36px, 5vw, 56px); }
.stage__head {
  display: grid; gap: 6px 32px; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: start;
  margin-bottom: 20px; padding: 22px 24px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line);
}
.stage__weeks { grid-column: 1; margin: 0; font-size: .8125rem; font-weight: 750; letter-spacing: .06em; text-transform: uppercase; color: var(--accent-strong); }
.stage__title { grid-column: 1; font-size: clamp(1.375rem, 1.1rem + 1vw, 1.75rem); }
.stage__sub { grid-column: 1; margin: 0; color: var(--muted); }
.stage__goals { grid-column: 2; grid-row: 1 / span 3; padding-left: 24px; border-left: 1px solid var(--line); }
.stage__goals-label { margin: 0 0 6px; font-weight: 700; font-size: .9375rem; }
.stage__goals ul { margin: 0; padding-left: 1.2em; color: var(--ink-2); font-size: .975rem; }
.stage__goals li { margin: 3px 0; }
@media (max-width: 760px) {
  .stage__head { grid-template-columns: minmax(0, 1fr); }
  .stage__goals { grid-column: 1; grid-row: auto; padding: 14px 0 0; border-left: 0; border-top: 1px solid var(--line); margin-top: 8px; }
}
.week-grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(min(100%, 18.5rem), 1fr)); }
.week { display: flex; flex-direction: column; padding: 20px; background: var(--surface); border: 1px solid var(--line); border-radius: 18px; }
.week--free { border-color: var(--free); box-shadow: inset 0 3px 0 var(--free); }
.week__top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.week__num { font-size: .8125rem; font-weight: 750; letter-spacing: .06em; text-transform: uppercase; color: var(--accent-strong); }
.week__title { font-size: 1.1875rem; margin: 8px 0 4px; }
.week__summary { color: var(--muted); font-size: .975rem; margin-bottom: 12px; }
.lessons { margin: 0 0 12px; padding: 0; list-style: none; counter-reset: lesson; border-top: 1px solid var(--line); }
.lessons li {
  counter-increment: lesson; display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 10px; align-items: baseline;
  padding: 9px 0; border-bottom: 1px solid var(--line); font-size: .95rem;
}
.lessons li::before { content: counter(lesson); min-width: 1.4em; color: var(--muted); font-variant-numeric: tabular-nums; font-size: .875rem; }
.lessons__min { color: var(--muted); font-size: .875rem; white-space: nowrap; }
.week__meta { margin-top: auto; color: var(--muted); font-size: .875rem; }
@media (max-width: 480px) {
  .week { padding: 16px; }
  .lessons li { grid-template-columns: auto minmax(0, 1fr); row-gap: 2px; }
  .lessons__min { grid-column: 2; }
  .lessons .tag { white-space: normal; max-width: 100%; }
}
:lang(zh-Hans) .week__num, :lang(zh-Hant) .week__num, :lang(ko) .week__num,
:lang(zh-Hans) .stage__weeks, :lang(zh-Hant) .stage__weeks, :lang(ko) .stage__weeks,
:lang(zh-Hans) .stage-card__weeks, :lang(zh-Hant) .stage-card__weeks, :lang(ko) .stage-card__weeks { letter-spacing: .02em; }

/* 支持页 */
.support-hero { display: grid; gap: 32px; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); align-items: start; }
@media (max-width: 900px) { .support-hero { grid-template-columns: minmax(0, 1fr); } }
.contact-card { padding: clamp(20px, 3vw, 28px); background: var(--surface); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow); }
.contact-card h2 { font-size: 1.375rem; margin-bottom: 14px; }
.contact-card__item { display: flex; gap: 14px; align-items: flex-start; padding: 12px 0; border-top: 1px solid var(--line); }
.contact-card__item h3 { font-size: 1.0625rem; margin: 2px 0 4px; }
.contact-card__item p { color: var(--ink-2); font-size: .975rem; }
.faq-groups { display: grid; gap: clamp(40px, 6vw, 64px); }
.faq-group .faq-list { margin-inline: 0; max-width: none; }
.faq-group__title { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.section h2.faq-group__title { font-size: clamp(1.375rem, 1.1rem + 1vw, 1.75rem); }
.faq-group__title .icon { color: var(--accent); }

/* 隐私政策 */
.doc-layout { display: grid; gap: 40px; grid-template-columns: minmax(0, 16rem) minmax(0, 1fr); align-items: start; }
.doc-toc { position: sticky; top: calc(var(--header-h) + 24px); }
.doc-toc__title { font-size: .875rem; font-weight: 750; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); margin-bottom: 8px; }
.doc-toc ol { counter-reset: toc; }
.doc-toc li { counter-increment: toc; }
.doc-toc a {
  display: flex; gap: 10px; align-items: center; min-height: 44px; padding: 4px 12px; border-radius: 10px;
  color: var(--ink-2); text-decoration: none; font-size: .9375rem; line-height: 1.35;
}
.doc-toc a::before { content: counter(toc); min-width: 1.3em; color: var(--muted); font-size: .8125rem; font-variant-numeric: tabular-nums; }
.doc-toc a:hover { background: var(--bg-soft); color: var(--accent-strong); }
@media (max-width: 900px) {
  .doc-layout { grid-template-columns: minmax(0, 1fr); }
  .doc-toc { position: static; padding: 16px; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); }
  .doc-toc ol { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 14rem), 1fr)); }
}
.prose { max-width: 48rem; padding: clamp(22px, 4vw, 48px); background: var(--surface); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow-sm); line-height: 1.7; }
.prose__lead { font-size: 1.1875rem; color: var(--ink); }
.prose h2 { font-size: clamp(1.25rem, 1.1rem + .6vw, 1.5rem); margin: 2em 0 .6em; padding-top: 1.4em; border-top: 1px solid var(--line); }
.prose section:first-of-type h2 { margin-top: 1.6em; }
.prose p, .prose li { color: var(--ink-2); }
.prose ul { padding-left: 1.3em; margin: 0 0 1em; }
.prose li { margin: .5em 0; }
.prose .callout { margin: 20px 0 24px; font-weight: 600; }

/* 404 */
.nf__inner { max-width: 44rem; text-align: center; }
.nf__art { width: min(240px, 100%); height: auto; margin: 0 auto 24px; display: block; }
.nf__band { fill: var(--accent-soft); }
.nf__trace { fill: none; stroke: var(--accent); stroke-width: 4; stroke-linecap: round; }
.nf__gap { stroke: var(--line-strong); stroke-width: 4; stroke-linecap: round; }
.nf h1 { font-size: clamp(2rem, 1.4rem + 2.4vw, 3rem); }
.nf__links { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin: 28px 0 40px; }
.nf__langs-title { font-size: 1rem; color: var(--muted); margin-bottom: 10px; }
.nf .lang-links { justify-content: center; }

/* ---------- 页脚 ---------- */
.site-footer { padding-block: 56px 32px; background: var(--surface); border-top: 1px solid var(--line); font-size: .9375rem; }
.site-footer__grid { display: grid; gap: 32px; grid-template-columns: minmax(0, 1.5fr) minmax(0, .8fr) minmax(0, 1fr) minmax(0, 1.2fr); }
@media (max-width: 960px) { .site-footer__grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
@media (max-width: 520px) { .site-footer__grid { grid-template-columns: minmax(0, 1fr); } }
.site-footer__brand p { color: var(--muted); max-width: 22rem; margin: 10px 0 16px; }
.site-footer__title { font-size: .8125rem; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
.site-footer__col a, .lang-links a { display: inline-flex; align-items: center; min-height: 44px; color: var(--ink-2); text-decoration: none; }
.site-footer__col a:hover, .lang-links a:hover { color: var(--accent-strong); text-decoration: underline; }
.lang-links { display: flex; flex-wrap: wrap; gap: 0 16px; list-style: none; margin: 0; padding: 0; }
.site-footer__col--langs .lang-links { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 8.5rem), 1fr)); gap: 0 12px; }
.lang-links a[aria-current] { font-weight: 700; color: var(--accent-strong); }
.site-footer__disclaimer { margin: 36px 0 0; padding: 14px 18px; border-radius: 14px; background: var(--bg-soft); color: var(--ink-2); }
.site-footer__legal { margin-top: 20px; color: var(--muted); font-size: .875rem; }
.site-footer__legal p { margin: 0 0 .4em; }

/* ---------- 动效与打印 ---------- */
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}
@media print {
  .site-header, .site-footer, .cta-band, .hero__visual, .split__visual, .toc, .doc-toc { display: none !important; }
  body { background: #fff; color: #000; }
  .hero, .section--deep { color: #000; background: none; }
  .hero__title, .section--deep h2 { color: #000; }
}