/* ================================================================
   趣练琴 JoyPlay — 移动优先样式表
   基准: 375px 手机 → min-width 断点向上适配
   ================================================================ */

/* ----- 设计令牌 ----- */
:root {
  --paper: #f5f2eb;
  --paper-soft: #fbfaf7;
  --ink: #17221d;
  --ink-soft: #59645e;
  --forest: #163d32;
  --forest-deep: #0e2d25;
  --lime: #d8f45b;
  --lime-dark: #bad63b;
  --orange: #ff7a45;
  --lavender: #c9bdf8;
  --line: rgba(23, 34, 29, 0.14);
  --white-line: rgba(255, 255, 255, 0.17);
  --shadow: 0 28px 80px rgba(22, 61, 50, 0.12);
  --radius: 28px;
  --font-cn: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-en: "DM Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
}

/* ----- 全局重置 (移动端基准) ----- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font-cn);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}
body.modal-open { overflow: hidden; }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; text-decoration: none; }
button { color: inherit; }
img { max-width: 100%; height: auto; }

/* ----- 布局容器 (手机基准) ----- */
.container {
  width: min(100% - 32px, 1180px);
  max-width: 100vw;
  margin-inline: auto;
}
.section { padding-block: 64px; position: relative; }
.hidden { display: none !important; }

/* ----- 装饰光晕 (手机缩小) ----- */
.page-glow {
  position: fixed;
  width: 280px; height: 280px;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.06;
  pointer-events: none;
  z-index: -1;
}
.page-glow-one { top: -100px; right: -80px; background: var(--lime); }
.page-glow-two { top: 400px; left: -120px; background: var(--lavender); }

/* ----- 导航 (手机基准) ----- */
.site-header { position: fixed; inset: 10px 0 auto; z-index: 50; transition: 0.3s ease; }
.site-header.scrolled .nav-shell {
  box-shadow: 0 10px 45px rgba(17, 34, 27, 0.12);
  background: rgba(251, 250, 247, 0.92);
}
.nav-shell {
  height: 56px;
  padding: 0 8px 0 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid rgba(255, 255, 255, 0.75);
  border-radius: 999px;
  background: rgba(245, 242, 235, 0.78);
  backdrop-filter: blur(20px);
  transition: 0.3s ease;
}
.brand { display: inline-flex; gap: 8px; align-items: center; }
.brand-mark {
  width: 30px; height: 30px;
  display: inline-flex;
  align-items: flex-end;
  justify-content: center;
  gap: 2px;
  padding: 7px 6px;
  background: var(--forest);
  border-radius: 50%;
  transform: rotate(-8deg);
}
.brand-mark i { display: block; width: 3px; border-radius: 3px; background: var(--lime); }
.brand-mark i:nth-child(1) { height: 8px; }
.brand-mark i:nth-child(2) { height: 15px; }
.brand-mark i:nth-child(3) { height: 11px; }
.brand-copy { display: grid; line-height: 1; gap: 3px; }
.brand-copy strong { font-size: 15px; letter-spacing: 0.06em; }
.brand-copy small { font: 600 8px/1 var(--font-en); letter-spacing: 0.2em; color: var(--ink-soft); }

/* 桌面导航 - 手机端隐藏 */
.desktop-nav { display: none; }
.nav-shell > .button { display: none; }

/* 汉堡菜单 */
.menu-toggle {
  width: 40px; height: 40px;
  display: grid;
  place-content: center;
  gap: 5px;
  border: 0;
  border-radius: 50%;
  background: var(--forest);
  cursor: pointer;
}
.menu-toggle span { width: 17px; height: 1px; background: white; transition: .2s; }
.menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3px) rotate(-45deg); }
.mobile-nav {
  position: absolute;
  top: 66px;
  left: 12px; right: 12px;
  padding: 8px;
  display: grid;
  border-radius: 18px;
  background: rgba(251, 250, 247, .96);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
  transition: .25s;
}
.mobile-nav.open { opacity: 1; transform: none; pointer-events: auto; }
.mobile-nav a {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  min-height: 48px;
  display: flex;
  align-items: center;
}
.mobile-nav a:last-child { border: 0; }

/* ----- 按钮 (手机基准) ----- */
.button {
  border: 0;
  border-radius: 999px;
  min-height: 48px;
  padding: 0 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  cursor: pointer;
  font-weight: 650;
  font-size: 14px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
  white-space: nowrap;
}
.button:active { transform: scale(.97); }
.button span { font-family: var(--font-en); font-size: 16px; }
.button-small { min-height: 40px; padding-inline: 16px; font-size: 12px; }
.button-primary { background: var(--lime); color: var(--forest-deep); box-shadow: 0 10px 28px rgba(186, 214, 59, 0.25); }
.button-dark { color: white; background: var(--forest); }
.button-ghost-light { background: transparent; border: 1px solid rgba(255,255,255,.35); color: white; }
.text-link {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  padding: 10px 0;
  font-size: 14px;
  font-weight: 600;
  border-bottom: 1px solid var(--line);
}
.text-link span { transition: transform 0.2s; }

/* ----- Hero (手机基准) ----- */
.hero {
  min-height: auto;
  padding-top: 100px;
  padding-bottom: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}
.hero-copy { text-align: center; order: 1; }
.hero-art { order: 2; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  color: var(--forest);
  font: 650 11px/1 var(--font-cn);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.eyebrow i {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255,122,69,.12);
}
.hero h1 {
  margin: 0;
  font-size: 32px;
  line-height: 1.15;
  letter-spacing: -0.04em;
  font-weight: 700;
}
.hero h1 em { color: var(--forest); font-style: normal; position: relative; }
.hero h1 em::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  bottom: 2px;
  z-index: -1;
  height: 10px;
  background: var(--lime);
  border-radius: 50%;
  transform: rotate(-1deg);
  opacity: 0.8;
}
.hero-copy > p {
  max-width: 320px;
  margin: 16px auto 20px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.75;
}
.hero-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.hero-proof {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 32px;
}
.hero-proof div {
  display: grid;
  gap: 4px;
  padding: 0 12px;
  border-right: 1px solid var(--line);
}
.hero-proof div:last-child { border: 0; padding-right: 0; }
.hero-proof strong { font: 650 18px/1 var(--font-en); letter-spacing: -0.04em; }
.hero-proof strong small { font-family: var(--font-cn); font-size: 10px; font-weight: 500; color: var(--ink-soft); }
.hero-proof span { color: var(--ink-soft); font-size: 10px; }

/* Hero 视觉区 (手机缩小) */
.hero-art {
  height: 340px;
  width: 100%;
  max-width: 360px;
  position: relative;
  display: grid;
  place-items: center;
  border-radius: 50% 50% 42% 46%;
  background: radial-gradient(circle at 50% 40%, rgba(216,244,91,.4), rgba(216,244,91,.06) 44%, transparent 64%);
}
.orbit { position: absolute; border: 1px solid rgba(22,61,50,.13); border-radius: 50%; }
.orbit-one { width: 300px; height: 210px; transform: rotate(-12deg); }
.orbit-two { width: 220px; height: 290px; transform: rotate(23deg); }
.art-note {
  position: absolute;
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  border-radius: 50%;
  font-size: 18px;
  box-shadow: var(--shadow);
  animation: bob 4s ease-in-out infinite;
}
.note-one { top: 50px; right: 40px; color: var(--forest); background: var(--lavender); }
.note-two { left: 30px; bottom: 80px; background: var(--orange); color: white; animation-delay: -2s; }
.instrument-stage {
  position: relative;
  width: 465px; height: 350px;
  z-index: 2;
  transform: scale(.55);
  filter: drop-shadow(0 38px 34px rgba(15,45,36,.25));
}
.piano-screen {
  position: absolute;
  width: 210px; height: 155px;
  left: 126px; top: 10px;
  border: 12px solid #1c2823;
  border-bottom-width: 16px;
  border-radius: 13px 13px 8px 8px;
  overflow: hidden;
  background: linear-gradient(150deg, #d8f45b, #9fd8c1 55%, #f8cdb7);
}
.piano-screen::after {
  content: "";
  position: absolute;
  width: 66px; height: 66px;
  right: 23px; top: 30px;
  border-radius: 50%;
  border: 8px solid rgba(255,255,255,.7);
  border-left-color: transparent;
}
.piano-screen span { position: absolute; left: 20px; height: 5px; border-radius: 9px; background: rgba(14,45,37,.62); }
.piano-screen span:nth-child(1) { top: 30px; width: 64px; }
.piano-screen span:nth-child(2) { top: 47px; width: 43px; }
.piano-screen span:nth-child(3) { top: 76px; width: 72px; height: 25px; background: rgba(255,255,255,.55); }
.piano-body {
  position: absolute;
  left: 20px; right: 20px; top: 142px;
  height: 128px;
  padding: 24px 18px 15px;
  background: linear-gradient(180deg, #26352e, #101c17);
  border-radius: 17px 17px 25px 25px;
  transform: perspective(700px) rotateX(9deg);
}
.piano-controls { position: absolute; left: 25px; top: 9px; display: flex; gap: 7px; }
.piano-controls i { width: 7px; height: 7px; border-radius: 50%; }
.piano-controls i:nth-child(1) { background: var(--lime); }
.piano-controls i:nth-child(2) { background: var(--orange); }
.piano-controls i:nth-child(3) { background: var(--lavender); }
.piano-keys {
  height: 82px; border-radius: 5px;
  background: repeating-linear-gradient(90deg, #f8f5ed 0 18px, #5d685f 18px 19px);
  position: relative; overflow: hidden;
}
.piano-keys::after {
  content: "";
  position: absolute; inset: 0;
  background: repeating-linear-gradient(90deg, transparent 0 12px, #17221d 12px 23px, transparent 23px 34px, #17221d 34px 45px, transparent 45px 55px);
  background-size: 127px 52px;
  background-repeat: repeat-x;
}
.piano-stand { position: absolute; top: 262px; width: 22px; height: 96px; background: #13211b; border-radius: 2px 2px 8px 8px; }
.piano-stand.left { left: 80px; transform: rotate(5deg); }
.piano-stand.right { right: 80px; transform: rotate(-5deg); }
.floating-card {
  position: absolute; z-index: 4;
  display: flex; align-items: center; gap: 8px;
  padding: 8px 12px 8px 8px;
  border: 1px solid rgba(255,255,255,.85);
  border-radius: 14px;
  background: rgba(255,255,255,.76);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
  transform: scale(.65);
  animation: bob 5s ease-in-out infinite;
}
.floating-card > span {
  display: grid; place-items: center;
  width: 30px; height: 30px;
  border-radius: 9px;
  background: var(--forest);
  color: var(--lime);
  font: 700 11px/1 var(--font-en);
}
.floating-card div { display: grid; gap: 3px; }
.floating-card b { font-size: 10px; }
.floating-card small { color: var(--ink-soft); font-size: 8px; }
.card-ai { left: -8px; top: 100px; }
.card-lesson { right: -10px; bottom: 100px; animation-delay: -2.4s; }
.card-lesson > span { background: var(--orange); color: white; }
.sound-pill {
  position: absolute; z-index: 5;
  left: 50%; bottom: 18px;
  transform: translateX(-50%);
  display: flex; align-items: center; gap: 3px;
  width: max-content;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--forest);
  color: white;
  box-shadow: var(--shadow);
  font-size: 9px;
}
.sound-pill span { width: 2px; height: 8px; background: var(--lime); border-radius: 3px; animation: wave .8s ease-in-out infinite alternate; }
.sound-pill span:nth-child(2) { height: 14px; animation-delay: -.4s; }
.sound-pill span:nth-child(3) { height: 10px; animation-delay: -.2s; }
.sound-pill span:nth-child(4) { height: 17px; animation-delay: -.6s; }
.sound-pill span:nth-child(5) { height: 7px; animation-delay: -.3s; }
.sound-pill b { margin-left: 5px; font-size: 9px; font-weight: 500; }
@keyframes bob { 50% { transform: translateY(-10px) rotate(1deg); } }
@keyframes wave { to { height: 3px; } }

/* ----- 品牌条 (手机: 横向滚动) ----- */
.brand-strip { border-block: 1px solid var(--line); background: rgba(255,255,255,.2); }
.brand-strip-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  gap: 18px;
  color: #69736e;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.brand-strip-inner::-webkit-scrollbar { display: none; }
.brand-strip span { font: 700 13px/1 var(--font-en); letter-spacing: .07em; flex-shrink: 0; }

/* ----- 通用标题 (手机基准) ----- */
.section-heading { margin-bottom: 36px; }
.section-heading.centered { max-width: 760px; margin-inline: auto; text-align: center; }
.section-heading h2, .hero h1 {
  margin: 0;
  font-size: 28px;
  line-height: 1.18;
  letter-spacing: -0.04em;
  font-weight: 700;
}
.section-heading p { color: var(--ink-soft); line-height: 1.7; font-size: 14px; margin-top: 12px; }
.section-heading.centered p { max-width: 500px; margin: 12px auto 0; }
.split-heading { display: flex; flex-direction: column; gap: 16px; }
.split-heading p { margin: 0; max-width: 600px; }

/* ----- 优势卡片 (手机: 单列) ----- */
.benefit-grid { display: flex; flex-direction: column; gap: 12px; }
.benefit-card {
  min-height: auto;
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 20px 18px;
  border: 1px solid rgba(23,34,29,.1);
  border-radius: 20px;
  background: rgba(251,250,247,.58);
  overflow: hidden;
  transition: .3s ease;
}
.card-index { color: #87908b; font: 600 10px/1 var(--font-en); }
.benefit-card h3 { margin: 10px 0 8px; font-size: 17px; letter-spacing: -.02em; }
.benefit-card p { margin: 0; color: var(--ink-soft); font-size: 13px; line-height: 1.7; }
.mini-visual { position: relative; width: 120px; height: 110px; margin: 24px auto 12px; }
.visual-cost { border-radius: 48% 52% 55% 45%; background: var(--lavender); display: grid; place-items: center; transform: rotate(-5deg); }
.visual-cost b { font: 700 36px/1 var(--font-en); transform: rotate(5deg); }
.visual-cost i { position: absolute; width: 34px; height: 34px; border: 2px solid var(--ink); border-radius: 50%; }
.visual-cost i:nth-of-type(1) { right: -8px; top: -4px; }
.visual-cost i:nth-of-type(2) { left: -6px; bottom: 3px; width: 18px; height: 18px; background: var(--orange); border: 0; }
.visual-home { border-radius: 50%; background: var(--lime); }
.visual-home::before { content: ""; position: absolute; width: 62px; height: 54px; left: 28px; top: 37px; background: var(--forest); border-radius: 5px 5px 14px 14px; }
.visual-home::after { content: ""; position: absolute; width: 52px; height: 52px; left: 33px; top: 19px; border-left: 11px solid var(--forest); border-top: 11px solid var(--forest); transform: rotate(45deg); }
.visual-home b { position: absolute; z-index: 2; left: 53px; top: 60px; width: 13px; height: 32px; background: var(--orange); border-radius: 7px 7px 0 0; }
.visual-grow { display: flex; align-items: end; justify-content: center; gap: 6px; padding: 16px; border-radius: 50% 50% 44% 56%; background: var(--orange); }
.visual-grow i { width: 14px; border-radius: 7px 7px 2px 2px; background: var(--forest); }
.visual-grow i:nth-child(1) { height: 24px; }
.visual-grow i:nth-child(2) { height: 42px; }
.visual-grow i:nth-child(3) { height: 58px; }
.visual-grow i:nth-child(4) { height: 78px; background: var(--lime); }
.visual-flex { border: 14px solid var(--forest); border-right-color: transparent; border-radius: 50%; transform: rotate(24deg); }
.visual-flex::after { content: ""; position: absolute; right: -14px; top: 1px; border: 13px solid transparent; border-top-color: var(--forest); transform: rotate(-20deg); }
.visual-flex i { position: absolute; inset: 17px; border-radius: 50%; background: var(--lime); }
.visual-flex b { position: absolute; z-index: 2; inset: 0; display: grid; place-items: center; font: 700 27px/1 var(--font-en); transform: rotate(-24deg); }

/* ----- 乐器展示 (手机: 纵向排列) ----- */
.instruments-section { background: var(--paper-soft); border-radius: 24px; }
.instrument-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 16px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding-bottom: 4px;
}
.instrument-tabs::-webkit-scrollbar { display: none; }
.instrument-tab {
  flex: none;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 12px;
  white-space: nowrap;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  transition: .2s;
}
.instrument-tab.active { color: white; background: var(--forest); border-color: var(--forest); }
.instrument-feature {
  display: flex;
  flex-direction: column;
  border-radius: 24px;
  overflow: hidden;
  background: var(--forest);
  color: white;
}
.instrument-visual {
  order: 1;
  min-height: 280px;
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: center;
  background: var(--product-color, var(--lavender));
}
.instrument-visual::before, .instrument-visual::after { content: ""; position: absolute; border: 1px solid rgba(23,34,29,.18); border-radius: 50%; }
.instrument-visual::before { width: 320px; height: 320px; }
.instrument-visual::after { width: 220px; height: 220px; }
.instrument-copy {
  order: 2;
  padding: 28px 22px;
  display: flex;
  flex-direction: column;
}
.instrument-copy .product-kicker { color: var(--lime); font-size: 11px; letter-spacing: .1em; }
.instrument-copy h3 { margin: 12px 0 6px; font-size: 28px; line-height: 1.15; letter-spacing: -.04em; }
.instrument-copy > p { margin: 12px 0 20px; color: rgba(255,255,255,.67); line-height: 1.7; font-size: 13px; }
.feature-list { display: flex; flex-direction: column; gap: 8px; margin-bottom: 24px; }
.feature-list span { padding: 10px 12px; border: 1px solid var(--white-line); border-radius: 10px; color: rgba(255,255,255,.82); font-size: 11px; }
.instrument-price { display: flex; align-items: end; gap: 8px; margin-top: auto; }
.instrument-price strong { font: 700 30px/1 var(--font-en); }
.instrument-price span { color: rgba(255,255,255,.58); font-size: 11px; }
.instrument-actions { display: flex; flex-direction: column; gap: 10px; margin-top: 18px; }
.instrument-actions .text-link { color: white; border-color: var(--white-line); }
.product-shape { position: relative; z-index: 2; filter: drop-shadow(0 25px 18px rgba(23,34,29,.22)); }
.product-shape.piano { width: 200px; height: 100px; border-radius: 10px 10px 22px 22px; background: #17221d; transform: scale(.7); }
.product-shape.piano::before { content: ""; position: absolute; inset: 22px 14px 15px; border-radius: 3px; background: repeating-linear-gradient(90deg, white 0 14px, #657069 14px 15px); }
.product-shape.piano::after { content: ""; position: absolute; width: 110px; height: 90px; left: calc(50% - 55px); bottom: 82px; border: 8px solid #17221d; border-radius: 8px; background: linear-gradient(135deg, var(--lime), #88bea9); }
.product-shape.grand { width: 200px; height: 200px; border-radius: 54% 12% 28% 40%; background: #18241f; transform: scale(.65) rotate(-6deg); }
.product-shape.grand::before { content: ""; position: absolute; width: 100%; height: 14px; left: 14px; bottom: 28px; background: white; border-radius: 3px; }
.product-shape.grand::after { content: ""; position: absolute; height: 130px; width: 8px; right: 34px; bottom: -115px; background: #18241f; transform: rotate(-4deg); }
.product-shape.wind { width: 70px; height: 260px; border-radius: 38px 38px 20px 20px; background: linear-gradient(90deg, #17221d, #40564c 45%, #17221d); transform: scale(.7) rotate(13deg); }
.product-shape.wind::before { content: ""; position: absolute; width: 34px; height: 68px; top: -46px; left: 23px; border-left: 11px solid #17221d; border-radius: 50%; transform: rotate(-18deg); }
.product-shape.wind::after { content: "······"; position: absolute; top: 60px; left: 25px; width: 17px; color: var(--lime); font: 900 20px/18px var(--font-en); overflow-wrap: anywhere; }
.product-shape.guitar { width: 150px; height: 200px; border-radius: 48% 52% 44% 56%; background: linear-gradient(145deg, #17221d, #3b4e46); transform: scale(.6) rotate(-12deg); }
.product-shape.guitar::before { content: ""; position: absolute; width: 36px; height: 200px; left: 56px; top: -170px; background: #17221d; border-radius: 12px 12px 3px 3px; }
.product-shape.guitar::after { content: ""; position: absolute; width: 56px; height: 56px; left: 44px; top: 60px; border: 7px solid var(--lime); border-radius: 50%; }
.product-shape.drums { width: 210px; height: 180px; border-bottom: 11px solid #17221d; transform: scale(.7) rotate(-4deg); }
.product-shape.drums::before, .product-shape.drums::after { content: ""; position: absolute; width: 90px; height: 90px; border: 15px solid #17221d; border-radius: 50%; background: #40564c; }
.product-shape.drums::before { left: 4px; top: 15px; }
.product-shape.drums::after { right: 4px; top: 56px; }
.visual-caption { position: absolute; z-index: 4; right: 16px; bottom: 16px; padding: 8px 12px; border-radius: 999px; background: rgba(255,255,255,.68); backdrop-filter: blur(12px); color: var(--ink); font-size: 9px; }

/* ----- 方案卡片 (手机: 单列) ----- */
.plans-section { overflow: hidden; }
.plan-grid { display: flex; flex-direction: column; gap: 14px; }
.plan-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: auto;
  padding: 24px 20px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(251,250,247,.58);
  transition: .3s ease;
}
.plan-card.featured {
  color: white;
  background: var(--forest);
  border-color: var(--forest);
  order: -1;
  box-shadow: 0 20px 50px rgba(22,61,50,.18);
}
.popular-tag {
  position: absolute;
  top: 14px; right: 14px;
  padding: 5px 10px;
  border-radius: 999px;
  background: var(--lime);
  color: var(--forest-deep);
  font-size: 9px;
  font-weight: 700;
}
.plan-name { color: var(--ink-soft); font-size: 11px; font-weight: 600; letter-spacing: .1em; }
.featured .plan-name { color: var(--lime); }
.plan-card h3 { margin: 14px 0 8px; font-size: 22px; }
.plan-description { min-height: auto; margin: 0; color: var(--ink-soft); font-size: 12px; line-height: 1.6; }
.featured .plan-description { color: rgba(255,255,255,.65); }
.plan-price { margin: 20px 0; padding-bottom: 20px; border-bottom: 1px solid var(--line); }
.featured .plan-price { border-color: var(--white-line); }
.plan-price strong { font: 700 36px/1 var(--font-en); letter-spacing: -.04em; }
.plan-price small { color: var(--ink-soft); font-size: 11px; }
.featured .plan-price small { color: rgba(255,255,255,.55); }
.plan-features { display: grid; gap: 10px; margin: 0 0 24px; padding: 0; list-style: none; }
.plan-features li { position: relative; padding-left: 22px; color: var(--ink-soft); font-size: 12px; line-height: 1.5; }
.plan-features li::before { content: "✓"; position: absolute; left: 0; color: var(--forest); font-weight: 800; font-size: 11px; }
.featured .plan-features li { color: rgba(255,255,255,.78); }
.featured .plan-features li::before { color: var(--lime); }
.plan-card .button { width: 100%; margin-top: auto; }
.plan-card.featured .button { background: var(--lime); color: var(--forest-deep); }
.plan-note { margin: 20px 0 0; text-align: center; color: var(--ink-soft); font-size: 10px; }

/* ----- 古典音乐区 (手机基准) ----- */
.classics-section { color: white; background: var(--forest-deep); border-radius: 24px; overflow: hidden; }
.classics-section::before { display: none; } /* 手机隐藏装饰圈 */
.eyebrow-light { color: var(--lime); }
.classics-header { display: flex; flex-direction: column; gap: 20px; margin-bottom: 36px; }
.classics-header h2 { font-size: 30px; }
.classics-intro p { color: rgba(255,255,255,.65); line-height: 1.7; font-size: 13px; }
.search-box {
  margin-top: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  height: 44px;
  padding: 0 14px;
  border: 1px solid var(--white-line);
  border-radius: 999px;
  background: rgba(255,255,255,.05);
}
.search-box span { font: 400 18px/1 var(--font-en); transform: rotate(-20deg); }
.search-box input { width: 100%; border: 0; outline: 0; background: transparent; color: white; font-size: 14px; }
.search-box input::placeholder { color: rgba(255,255,255,.42); }

/* 精选期数 (手机: 纵向) */
.featured-episode {
  display: flex;
  flex-direction: column;
  margin-bottom: 36px;
  border: 1px solid var(--white-line);
  border-radius: 22px;
  overflow: hidden;
  background: rgba(255,255,255,.04);
}
.featured-cover {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 200px;
  overflow: hidden;
  background: var(--episode-color, var(--lavender));
  color: var(--forest-deep);
}
.featured-cover::before { content: attr(data-number); position: absolute; right: -8px; bottom: -30px; color: rgba(14,45,37,.12); font: 800 150px/1 var(--font-en); letter-spacing: -.1em; }
.vinyl { position: relative; width: 130px; height: 130px; border-radius: 50%; background: repeating-radial-gradient(circle, #17221d 0 2px, #2d3b35 3px 5px); box-shadow: 10px 14px 28px rgba(14,45,37,.25); will-change: transform; animation: spin 12s linear infinite; animation-play-state: paused; }
.vinyl::after { content: ""; position: absolute; inset: 42px; border: 12px solid var(--lime); border-radius: 50%; background: var(--paper-soft); }
.vinyl.playing { animation-play-state: running; }
@keyframes spin { to { transform: rotate(360deg); } }
.featured-episode-copy { padding: 24px 20px; display: flex; flex-direction: column; }
.featured-episode-copy .episode-meta { color: var(--lime); }
.featured-episode-copy h3 { margin: 14px 0; font-size: 22px; line-height: 1.35; }
.featured-episode-copy p { color: rgba(255,255,255,.62); line-height: 1.7; font-size: 13px; }
.featured-episode-copy button { align-self: flex-start; margin-top: 12px; }

/* 期数列表 */
.episode-meta { display: flex; gap: 8px; align-items: center; color: rgba(255,255,255,.55); font: 600 9px/1 var(--font-cn); letter-spacing: .06em; }
.episode-meta span + span::before { content: "·"; margin-right: 8px; }
.episode-toolbar { display: flex; flex-direction: column; gap: 12px; margin-bottom: 20px; }
.episode-toolbar > span { font-size: 13px; font-weight: 600; }
.episode-filters { display: flex; gap: 6px; flex-wrap: wrap; }
.episode-filter {
  border: 1px solid var(--white-line);
  border-radius: 999px;
  padding: 8px 14px;
  color: rgba(255,255,255,.58);
  background: transparent;
  cursor: pointer;
  font-size: 11px;
  white-space: nowrap;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  transition: .2s;
}
.episode-filter.active { color: var(--forest-deep); background: var(--lime); border-color: var(--lime); }
.episode-grid { display: flex; flex-direction: column; gap: 12px; }
.episode-card {
  display: flex;
  flex-direction: column;
  padding: 16px;
  border: 1px solid var(--white-line);
  border-radius: 18px;
  background: rgba(255,255,255,.035);
  transition: .2s;
  cursor: pointer;
}
.episode-card-cover {
  position: relative;
  height: 130px;
  display: flex;
  align-items: end;
  justify-content: space-between;
  padding: 14px;
  border-radius: 12px;
  overflow: hidden;
  color: var(--forest-deep);
  background: var(--episode-color);
}
.episode-card-cover::before { content: ""; position: absolute; width: 90px; height: 90px; right: -15px; top: -30px; border: 1px solid currentColor; border-radius: 50%; box-shadow: 0 0 0 16px rgba(23,34,29,.06), 0 0 0 32px rgba(23,34,29,.04); }
.episode-card-cover strong { font: 800 36px/1 var(--font-en); opacity: .72; }
.episode-card-cover span { z-index: 1; display: grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; color: white; background: var(--forest-deep); font-size: 14px; }
.episode-card .episode-meta { margin: 16px 2px 0; }
.episode-card h3 { margin: 10px 2px 6px; font-size: 16px; line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.episode-card p { margin: 0 2px; color: rgba(255,255,255,.5); font-size: 11px; line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.load-more { margin: 24px auto 0; }
.empty-state { padding: 50px 20px; text-align: center; color: rgba(255,255,255,.52); font-size: 13px; }

/* ----- 琴房 (手机: 纵向) ----- */
.studio-panel {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 24px;
  overflow: hidden;
  background: var(--paper-soft);
  box-shadow: var(--shadow);
}
.studio-copy { padding: 32px 22px; }
.studio-copy h2 { font-size: 28px; }
.studio-copy > p { margin: 16px 0; color: var(--ink-soft); line-height: 1.7; font-size: 13px; }
.studio-features { display: flex; flex-wrap: wrap; gap: 6px; margin: 20px 0 24px; }
.studio-features span { padding: 7px 10px; border: 1px solid var(--line); border-radius: 999px; color: var(--ink-soft); font-size: 10px; }
.studio-map { position: relative; min-height: 280px; overflow: hidden; background: #d9e0d0; }
.studio-map::before { content: ""; position: absolute; inset: 18px; border: 1px solid rgba(23,34,29,.13); border-radius: 18px; }
.map-river { position: absolute; width: 500px; height: 120px; left: -50px; bottom: -25px; border-radius: 50%; border: 30px solid #a9cfd0; transform: rotate(-8deg); }
.map-road { position: absolute; height: 1px; background: rgba(23,34,29,.25); transform-origin: left; }
.map-road::after { content: ""; position: absolute; inset: -5px 0; border-block: 1px dashed rgba(23,34,29,.1); }
.road-a { width: 380px; left: 40px; top: 110px; transform: rotate(17deg); }
.road-b { width: 340px; left: 120px; top: 50px; transform: rotate(68deg); }
.road-c { width: 350px; left: 20px; top: 260px; transform: rotate(-28deg); }
.map-pin { position: absolute; z-index: 3; display: flex; align-items: center; gap: 6px; padding: 6px 9px 6px 6px; border-radius: 999px; background: rgba(255,255,255,.84); box-shadow: 0 6px 16px rgba(23,34,29,.13); backdrop-filter: blur(8px); font-size: 9px; }
.map-pin i { width: 10px; height: 10px; border: 3px solid var(--forest); border-radius: 50%; background: var(--lime); }
.pin-a { left: 18%; top: 22%; }
.pin-b { right: 10%; top: 30%; }
.pin-c { left: 38%; top: 50%; }
.pin-d { left: 14%; bottom: 12%; }

/* ----- FAQ (手机基准) ----- */
.faq-list { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-question {
  width: 100%;
  display: grid;
  grid-template-columns: 26px 1fr 32px;
  align-items: center;
  gap: 10px;
  padding: 18px 0;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
}
.faq-question > span:first-child { color: #8b948f; font: 600 10px/1 var(--font-en); }
.faq-question strong { font-size: 14px; line-height: 1.4; }
.faq-question i { position: relative; width: 28px; height: 28px; border: 1px solid var(--line); border-radius: 50%; }
.faq-question i::before, .faq-question i::after { content: ""; position: absolute; left: 8px; right: 8px; top: 13px; height: 1px; background: var(--ink); transition: .25s; }
.faq-question i::after { transform: rotate(90deg); }
.faq-item.open .faq-question i::after { transform: rotate(0); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
.faq-answer p { margin: 0 0 20px 36px; color: var(--ink-soft); line-height: 1.7; font-size: 13px; }

/* ----- 联系表单 (手机基准) ----- */
.contact-section { padding: 60px 0; color: white; background: var(--forest); }
.contact-shell { display: flex; flex-direction: column; gap: 36px; }
.contact-copy h2 { font-size: 30px; }
.contact-copy > p { color: rgba(255,255,255,.62); line-height: 1.7; font-size: 13px; }
.contact-trust { display: flex; gap: 18px; margin-top: 28px; }
.contact-trust span { display: grid; gap: 4px; color: rgba(255,255,255,.47); font-size: 9px; }
.contact-trust b { color: white; font: 650 18px/1 var(--font-en); }
.contact-form { padding: 22px 18px; border: 1px solid rgba(255,255,255,.15); border-radius: 20px; background: rgba(255,255,255,.07); backdrop-filter: blur(15px); }
.field-row { display: flex; flex-direction: column; gap: 0; }
.contact-form label { display: grid; gap: 6px; margin-bottom: 14px; color: rgba(255,255,255,.65); font-size: 10px; }
.contact-form input, .contact-form select, .contact-form textarea {
  width: 100%;
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 10px;
  outline: 0;
  background: rgba(255,255,255,.07);
  color: white;
  padding: 12px;
  font-size: 16px; /* 防止iOS缩放 */
  transition: border .2s;
}
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus { border-color: var(--lime); }
.contact-form input::placeholder, .contact-form textarea::placeholder { color: rgba(255,255,255,.32); }
.contact-form select option { color: var(--ink); }
.contact-form textarea { resize: vertical; min-height: 80px; }
.form-footer { display: flex; flex-direction: column; gap: 12px; margin-top: 4px; }
.form-footer small { color: rgba(255,255,255,.4); font-size: 9px; line-height: 1.6; }
.form-message { min-height: 18px; margin: 10px 0 0; color: var(--lime); font-size: 11px; }

/* ----- Footer (手机基准) ----- */
.site-footer { padding: 48px 0 20px; color: white; background: #091f19; }
.brand-light .brand-mark { background: var(--lime); }
.brand-light .brand-mark i { background: var(--forest); }
.brand-light .brand-copy small { color: rgba(255,255,255,.5); }
.footer-main {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  padding-bottom: 32px;
}
.footer-main > p { color: rgba(255,255,255,.42); font-size: 12px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 14px; color: rgba(255,255,255,.68); font-size: 11px; }
.footer-links a:hover { color: var(--lime); }
.footer-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,.1);
  color: rgba(255,255,255,.35);
  font-size: 10px;
  text-align: center;
}
.footer-beian {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding-top: 12px;
  color: rgba(255,255,255,.45);
  font-size: 10px;
  flex-wrap: wrap;
  text-align: center;
  word-break: break-all;
}
.footer-beian a { color: rgba(255,255,255,.45); }
.footer-beian a:hover { color: var(--lime); }
.footer-beian img { width: 14px; height: 14px; flex-shrink: 0; }

/* ----- 弹窗 (手机基准) ----- */
.modal {
  width: min(100% - 24px, 500px);
  max-height: calc(100vh - 24px);
  padding: 28px 20px;
  border: 0;
  border-radius: 22px;
  color: var(--ink);
  background: var(--paper-soft);
  box-shadow: 0 30px 90px rgba(8,31,25,.35);
  overflow: auto;
}
.modal::backdrop { background: rgba(8,31,25,.72); backdrop-filter: blur(8px); }
.modal-close {
  position: absolute;
  right: 12px; top: 12px;
  width: 40px; height: 40px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  font: 300 20px/1 var(--font-en);
  display: grid;
  place-items: center;
}
.checkout-step h2 { margin: 0 0 20px; font-size: 22px; letter-spacing: -.03em; }
.checkout-step h3 { margin: 20px 0 10px; font-size: 12px; }
.order-summary { display: flex; align-items: center; justify-content: space-between; padding: 14px; border-radius: 14px; background: var(--paper); }
.order-summary div { display: grid; gap: 4px; }
.order-summary b { font-size: 14px; }
.order-summary span { color: var(--ink-soft); font-size: 10px; }
.order-summary strong { font: 700 20px/1 var(--font-en); }
.payment-options { display: grid; gap: 8px; }
.payment-option {
  width: 100%;
  display: grid;
  grid-template-columns: 36px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: white;
  text-align: left;
  cursor: pointer;
  transition: .2s;
  min-height: 52px;
}
.pay-logo { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; color: white; font-weight: 800; font-size: 14px; }
.alipay-logo { background: #1677ff; }
.wechat-logo { background: #07c160; }
.payment-option div { display: grid; gap: 3px; }
.payment-option b { font-size: 13px; }
.payment-option small { color: var(--ink-soft); font-size: 9px; }
.secure-note { margin: 14px 0 0; color: var(--ink-soft); font-size: 8px; text-align: center; }
.checkout-step[data-checkout-step="pending"], .checkout-step[data-checkout-step="success"] { padding: 24px 0 10px; text-align: center; }
.checkout-step[data-checkout-step="pending"] > p, .checkout-step[data-checkout-step="success"] > p { color: var(--ink-soft); line-height: 1.6; font-size: 13px; }
.payment-state-icon { width: 56px; height: 56px; margin: 0 auto 18px; display: grid; place-items: center; border-radius: 50%; background: rgba(216,244,91,.4); }
.payment-state-icon span { width: 18px; height: 24px; border: 3px solid var(--forest); border-top: 0; border-radius: 0 0 5px 5px; position: relative; }
.payment-state-icon span::before { content: ""; position: absolute; width: 11px; height: 7px; border: 3px solid var(--forest); border-bottom: 0; border-radius: 7px 7px 0 0; left: 1px; top: -8px; }
.qr-wrap { width: 170px; height: 170px; margin: 16px auto; padding: 10px; border: 1px solid var(--line); border-radius: 14px; background: white; }
.qr-wrap img { width: 100%; height: 100%; display: block; }
.payment-loader { display: flex; justify-content: center; align-items: center; gap: 7px; margin-top: 14px; color: var(--ink-soft); font-size: 9px; }
.payment-loader i { width: 11px; height: 11px; border: 2px solid var(--line); border-top-color: var(--forest); border-radius: 50%; animation: spin .8s linear infinite; }
.success-mark { display: grid; place-items: center; width: 60px; height: 60px; margin: 0 auto 16px; border-radius: 50%; background: var(--lime); color: var(--forest); font-size: 28px; }
.checkout-step[data-checkout-step="success"] .button { margin-top: 14px; min-width: 130px; }
.reader-modal { width: 100%; max-height: 100vh; padding: 0; border-radius: 0; }
.reader-modal .modal-close { z-index: 2; background: rgba(255,255,255,.75); }
.reader-hero { min-height: 180px; padding: 30px 22px; display: flex; flex-direction: column; justify-content: end; color: var(--forest-deep); background: var(--episode-color); }
.reader-hero h1 { max-width: 100%; margin: 10px 0 0; font-size: 24px; line-height: 1.25; letter-spacing: -.03em; }
.reader-body { padding: 28px 22px 45px; }
.reader-body p { color: #46514b; line-height: 1.9; font-size: 14px; }
.reader-body h2 { margin-top: 28px; font-size: 20px; }
.reader-body blockquote { margin: 24px 0; padding: 16px 20px; border-left: 3px solid var(--lime-dark); background: var(--paper); color: var(--forest); font-size: 15px; line-height: 1.7; }
.reader-loading { min-height: 180px; display: grid; place-items: center; color: var(--ink-soft); font-size: 14px; }
.reader-body-imported { padding: 0; background: #fff; }
.reader-body-imported > .xiaobei-imported-article { max-width: none !important; }
.reader-body-imported a { overflow-wrap: anywhere; }
.reader-body-imported img { max-width: 100%; height: auto; }

/* ----- 滚动动画 (手机减少) ----- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s cubic-bezier(.2,.75,.25,1); }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: .08s; }
.reveal-delay-2 { transition-delay: .16s; }
.reveal-delay-3 { transition-delay: .24s; }

/* ================================================================
   断点 1: ≥520px (大手机 / 小平板)
   ================================================================ */
@media (min-width: 520px) {
  .container { width: min(100% - 40px, 1180px); }
  .section { padding-block: 80px; }
  .hero { padding-top: 120px; }
  .hero h1 { font-size: 38px; }
  .hero-copy > p { max-width: 440px; font-size: 15px; }
  .hero-art { height: 420px; max-width: 440px; }
  .instrument-stage { transform: scale(.65); }
  .benefit-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
  .benefit-card { padding: 22px 20px; }
  .section-heading h2 { font-size: 34px; }
  .instrument-copy { padding: 32px 28px; }
  .instrument-copy h3 { font-size: 34px; }
  .feature-list { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
  .instrument-actions { flex-direction: row; }
  .plan-card { padding: 28px 24px; }
  .episode-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
  .episode-toolbar { flex-direction: row; justify-content: space-between; align-items: center; }
  .episode-filters { flex-wrap: wrap; }
  .studio-copy { padding: 40px 32px; }
  .studio-copy h2 { font-size: 34px; }
  .studio-map { min-height: 340px; }
  .contact-form { padding: 28px 24px; }
  .field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
  .form-footer { flex-direction: row; align-items: center; justify-content: space-between; }
  .footer-main { flex-direction: row; flex-wrap: wrap; align-items: center; gap: 24px; }
  .footer-bottom { flex-direction: row; justify-content: space-between; text-align: left; }
  .footer-beian { justify-content: center; font-size: 10px; }
  .footer-beian img { width: 14px; height: 14px; }
  .classics-section { border-radius: 32px; }
  .instruments-section { border-radius: 32px; }
  .modal { padding: 32px 28px; }
  .checkout-step h2 { font-size: 26px; }
  .order-summary strong { font-size: 22px; }
}

/* ================================================================
   断点 2: ≥768px (平板)
   ================================================================ */
@media (min-width: 768px) {
  .container { width: min(100% - 56px, 1180px); }
  .section { padding-block: 100px; }
  .site-header { inset: 14px 0 auto; }
  .nav-shell { height: 62px; padding: 0 12px 0 18px; }
  .brand-mark { width: 32px; height: 32px; }
  .brand-copy strong { font-size: 16px; }
  .hero { padding-top: 140px; padding-bottom: 60px; }
  .hero h1 { font-size: 46px; }
  .hero-copy > p { font-size: 16px; }
  .hero-actions { flex-direction: row; gap: 16px; }
  .hero-proof { gap: 20px; }
  .hero-proof strong { font-size: 22px; }
  .hero-proof span { font-size: 11px; }
  .hero-art { height: 500px; max-width: 520px; }
  .instrument-stage { transform: scale(.78); }
  .orbit-one { width: 420px; height: 300px; }
  .orbit-two { width: 340px; height: 440px; }
  .floating-card { transform: scale(.85); }
  .card-ai { left: 0; }
  .card-lesson { right: 0; }
  .sound-pill { bottom: 45px; }
  .brand-strip-inner { min-height: 80px; gap: 28px; overflow-x: visible; }
  .brand-strip span { font-size: 16px; }
  .section-heading h2 { font-size: 42px; }
  .benefit-grid { grid-template-columns: repeat(2, 1fr); }
  .benefit-card { padding: 28px 24px; }
  .instrument-feature { flex-direction: row; min-height: 480px; }
  .instrument-visual { order: 0; min-height: auto; flex: 1; }
  .instrument-copy { order: 0; flex: 1; padding: 40px 36px; }
  .instrument-copy h3 { font-size: 38px; }
  .product-shape { transform: scale(.85); }
  .product-shape.piano { transform: scale(.85); }
  .product-shape.wind { transform: scale(.85) rotate(13deg); }
  .product-shape.guitar { transform: scale(.8) rotate(-12deg); }
  .product-shape.grand { transform: scale(.8) rotate(-6deg); }
  .product-shape.drums { transform: scale(.85) rotate(-4deg); }
  .plan-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
  .plan-card.featured { order: 0; transform: translateY(-12px); }
  .classics-section { border-radius: 36px; }
  .instruments-section { border-radius: 36px; }
  .classics-section::before { display: block; }
  .classics-header { flex-direction: row; justify-content: space-between; align-items: end; gap: 40px; }
  .classics-header h2 { font-size: 44px; }
  .featured-episode { flex-direction: row; }
  .featured-cover { min-height: auto; flex: 1; }
  .featured-episode-copy { flex: 1; padding: 32px 28px; }
  .featured-episode-copy h3 { font-size: 28px; }
  .episode-grid { grid-template-columns: repeat(3, 1fr); gap: 14px; }
  .studio-panel { flex-direction: row; min-height: 480px; }
  .studio-copy { flex: 1; padding: 48px 40px; }
  .studio-copy h2 { font-size: 40px; }
  .studio-map { flex: 1; min-height: auto; }
  .contact-shell { flex-direction: row; gap: 50px; align-items: center; }
  .contact-copy { flex: 1; }
  .contact-form { flex: 1.2; }
  .contact-copy h2 { font-size: 40px; }
  .footer-main { flex-direction: row; align-items: center; gap: 32px; }
  .modal { padding: 36px 32px; }
  .checkout-step h2 { font-size: 28px; }
  .reader-modal { width: min(700px, calc(100% - 28px)); border-radius: 22px; }
  .reader-hero { min-height: 220px; padding: 40px 36px; }
  .reader-hero h1 { font-size: 32px; }
  .reader-body { padding: 36px 36px 55px; }
  .page-glow { width: 420px; height: 420px; opacity: 0.1; filter: blur(90px); }
}

/* ================================================================
   断点 3: ≥1024px (桌面)
   ================================================================ */
@media (min-width: 1024px) {
  .container { width: min(100% - 80px, 1180px); }
  .section { padding-block: 120px; }
  .site-header { inset: 18px 0 auto; }
  .nav-shell { height: 68px; padding: 0 14px 0 20px; }
  .brand-mark { width: 34px; height: 34px; }
  .brand-copy strong { font-size: 17px; }
  .menu-toggle { display: none; }
  .mobile-nav { display: none; }
  .desktop-nav { display: flex; align-items: center; gap: 32px; margin-left: auto; margin-right: 34px; }
  .desktop-nav a { position: relative; color: #47534d; font-size: 14px; font-weight: 500; }
  .desktop-nav a::after { content: ""; position: absolute; left: 50%; right: 50%; bottom: -7px; height: 2px; background: var(--forest); transition: 0.25s ease; }
  .desktop-nav a:hover::after { left: 0; right: 0; }
  .nav-shell > .button { display: inline-flex; }
  .hero { display: grid; grid-template-columns: 0.9fr 1.1fr; align-items: center; gap: 42px; padding-top: 160px; padding-bottom: 90px; min-height: 800px; }
  .hero-copy { text-align: left; order: 0; }
  .hero-art { order: 0; height: 610px; max-width: none; }
  .hero h1 { font-size: clamp(46px, 6vw, 82px); }
  .hero-copy > p { font-size: 18px; max-width: 570px; margin-inline: 0; }
  .hero-actions { justify-content: flex-start; }
  .hero-proof { justify-content: flex-start; }
  .hero-proof strong { font-size: 26px; }
  .instrument-stage { transform: scale(1); }
  .orbit-one { width: 550px; height: 390px; }
  .orbit-two { width: 440px; height: 570px; }
  .floating-card { transform: scale(1); }
  .card-ai { left: 12px; top: 125px; }
  .card-lesson { right: -3px; bottom: 140px; }
  .sound-pill { bottom: 72px; }
  .brand-strip-inner { min-height: 94px; justify-content: space-between; }
  .section-heading h2 { font-size: clamp(38px, 4.6vw, 64px); }
  .split-heading { display: grid; grid-template-columns: 1fr 400px; align-items: end; gap: 60px; }
  .benefit-grid { grid-template-columns: repeat(4, 1fr); gap: 16px; }
  .benefit-card { min-height: 390px; padding: 24px; }
  .benefit-card:hover { transform: translateY(-8px); background: var(--paper-soft); box-shadow: var(--shadow); }
  .instrument-feature { min-height: 550px; }
  .instrument-copy { padding: 62px 55px; }
  .instrument-copy h3 { font-size: clamp(32px, 4vw, 54px); }
  .product-shape { transform: scale(1); }
  .product-shape.piano { transform: scale(1); }
  .product-shape.wind { transform: scale(1) rotate(13deg); }
  .product-shape.guitar { transform: scale(1) rotate(-12deg); }
  .product-shape.grand { transform: scale(1) rotate(-6deg); }
  .product-shape.drums { transform: scale(1) rotate(-4deg); }
  .plan-card { min-height: 570px; padding: 34px; }
  .plan-card:hover { transform: translateY(-7px); box-shadow: var(--shadow); }
  .plan-card.featured { transform: translateY(-16px); box-shadow: 0 32px 80px rgba(22,61,50,.2); }
  .plan-card.featured:hover { transform: translateY(-22px); }
  .classics-section { border-radius: 44px; }
  .instruments-section { border-radius: 44px; }
  .classics-header h2 { font-size: clamp(42px, 5.2vw, 70px); }
  .featured-episode-copy { padding: 48px; }
  .featured-episode-copy h3 { font-size: 34px; }
  .studio-panel { min-height: 570px; }
  .studio-copy { padding: 64px; }
  .studio-copy h2 { font-size: clamp(38px, 4vw, 56px); }
  .contact-copy h2 { font-size: clamp(42px, 5vw, 68px); }
  .contact-shell { gap: 80px; }
  .contact-form { padding: 38px; }
  .footer-main { gap: 40px; padding-bottom: 50px; }
  .footer-bottom { font-size: 12px; }
  .footer-beian { font-size: 11px; }
  .footer-beian img { width: 16px; height: 16px; }
  .modal { padding: 38px; border-radius: 28px; }
  .checkout-step h2 { font-size: 30px; }
  .order-summary strong { font-size: 25px; }
  .reader-hero { min-height: 260px; padding: 55px; }
  .reader-hero h1 { font-size: clamp(30px, 5vw, 48px); }
  .reader-body { padding: 50px 55px 65px; }
  .page-glow { width: 560px; height: 560px; opacity: 0.12; filter: blur(100px); }
  .page-glow-one { top: -240px; right: -150px; }
  .page-glow-two { top: 720px; left: -300px; }
}

/* ================================================================
   断点 4: ≥1280px (宽屏)
   ================================================================ */
@media (min-width: 1280px) {
  .button:hover { transform: translateY(-2px); }
  .button:active { transform: scale(1); }
  .text-link:hover span { transform: translateX(4px); }
  .brand-strip-inner { overflow-x: visible; }
  .episode-card:hover { transform: translateY(-6px); border-color: rgba(216,244,91,.52); background: rgba(255,255,255,.07); }
  .payment-option:hover { border-color: var(--forest); transform: translateY(-2px); }
  .button-primary:hover { background: #e3fa79; box-shadow: 0 18px 44px rgba(186, 214, 59, 0.35); }
  .button-dark:hover { background: var(--forest-deep); }
}

/* ================================================================
   减少动画偏好
   ================================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}