/* ==========================================================================
   NEO Music 宣传页（m.music.neocn.top）
   style.css 原样复用主站（MD3 令牌 + 头部/页脚/按钮），这里只放本页新增板块。
   所有新类以 m- 前缀，避免和主站类名打架。
   ========================================================================== */

/* ---------- LOGO（用他们给的 LOGO.jpg，已裁掉留白并抠成透明） ---------- */
.logo-img {
  display: block;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  transition: transform var(--transition);
}

.logo:hover .logo-img {
  transform: rotate(-6deg) scale(1.05);
}

.footer-logo {
  display: block;
  width: 28px;
  height: 28px;
}

.m-card__head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
}

.m-card__logo {
  display: block;
  width: 56px;
  height: 56px;
  flex-shrink: 0;
}

.m-card__head .m-card__title {
  margin-bottom: 0;
}

/* ---------- 首屏 ---------- */
.m-hero {
  padding: 72px 0 88px;
  overflow: hidden;
}

.m-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  align-items: center;
  gap: 56px;
}

.m-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  padding: 7px 14px;
  border-radius: var(--radius-full);
  background-color: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.m-hero__badge .m-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: currentColor;
}

.m-hero__title {
  font-family: var(--font-sans);
  font-size: clamp(2.1rem, 4.2vw, 3.1rem);
  font-weight: 600;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--md-on-surface);
  margin-bottom: 18px;
}

.m-hero__desc {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--md-on-surface-variant);
  margin-bottom: 32px;
  max-width: 34em;
}

.m-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.m-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.85rem;
  color: var(--md-on-surface-variant);
}

.m-hero__meta li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.m-hero__meta li + li::before {
  content: '';
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background-color: var(--md-outline);
}

/* ---------- 首屏设备预览 ---------- */
.m-hero__visual {
  position: relative;
  padding-bottom: 28px;
}

.m-frame {
  border-radius: var(--radius-lg);
  background-color: var(--md-surface-container-highest);
  box-shadow: var(--md-elevation-3);
  overflow: hidden;
}

.m-frame--window {
  border: 1px solid var(--md-outline-variant);
}

.m-frame__bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  background-color: var(--md-surface-container-high);
}

.m-frame__bar i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--md-outline-variant);
}

.m-frame img {
  display: block;
  width: 100%;
  height: auto;
}

.m-frame--phone {
  position: absolute;
  right: 4%;
  bottom: 0;
  width: 168px;
  padding: 6px;
  border-radius: 24px;
  background-color: var(--md-surface-container-highest);
  box-shadow: var(--md-elevation-4);
}

.m-frame--phone img {
  border-radius: 18px;
}

/* ---------- 通用板块 ---------- */
.m-section {
  padding: 84px 0;
}

.m-section--alt {
  background-color: var(--md-surface-container-low);
}

.m-section__sub {
  max-width: 42em;
  margin: 0 auto;
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--md-on-surface-variant);
}

/* ---------- 功能 ---------- */
.m-features {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.m-feature {
  padding: 24px;
  border-radius: var(--radius-md);
  background-color: var(--md-surface-container-low);
  box-shadow: var(--md-elevation-1);
  transition: box-shadow var(--transition-emphasized), background-color var(--transition);
}

.m-section--alt .m-feature {
  background-color: var(--md-surface-container-lowest);
}

.m-feature:hover {
  box-shadow: var(--md-elevation-3);
  background-color: var(--md-surface-container);
}

.m-feature__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  margin-bottom: 16px;
  border-radius: var(--radius-sm);
  background-color: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
}

.m-feature__title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--md-on-surface);
}

.m-feature__desc {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--md-on-surface-variant);
}

/* ---------- 截图 ---------- */
.m-shots {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  align-items: start;
}

.m-shot {
  margin: 0;
  border-radius: var(--radius-md);
  background-color: var(--md-surface-container-lowest);
  box-shadow: var(--md-elevation-2);
  overflow: hidden;
}

.m-shot img {
  display: block;
  width: 100%;
  height: auto;
  background-color: var(--md-surface-container);
}

.m-shot figcaption {
  padding: 14px 18px;
  font-size: 0.85rem;
  color: var(--md-on-surface-variant);
}

.m-shot--phone img {
  max-height: 560px;
  object-fit: cover;
  object-position: top;
}

/* ---------- 下载 ---------- */
.m-download {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.m-card {
  padding: 28px;
  border-radius: var(--radius-lg);
  background-color: var(--md-surface-container-lowest);
  box-shadow: var(--md-elevation-2);
}

.m-card__title {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--md-on-surface);
}

.m-card__desc {
  margin: 0 0 22px;
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--md-on-surface-variant);
}

.m-spec {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin: 0 0 24px;
  padding: 16px 0;
  border-top: 1px solid var(--md-outline-variant);
  border-bottom: 1px solid var(--md-outline-variant);
}

.m-spec dt {
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  color: var(--md-on-surface-variant);
  margin-bottom: 4px;
}

.m-spec dd {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--md-on-surface);
}

.m-btn--lg {
  width: 100%;
  height: 52px;
  font-size: 1rem;
}

.m-note {
  margin: 14px 0 0;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--md-on-surface-variant);
}

.m-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.m-steps li {
  position: relative;
  padding: 0 0 22px 46px;
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--md-on-surface-variant);
}

.m-steps li:last-child {
  padding-bottom: 0;
}

.m-steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: -2px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background-color: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  font-size: 0.85rem;
  font-weight: 600;
}

.m-steps li:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 14px;
  top: 32px;
  bottom: 8px;
  width: 2px;
  background-color: var(--md-outline-variant);
}

.m-steps code {
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  background-color: var(--md-surface-container-high);
  font-size: 0.85em;
}

/* ---------- 说明 ---------- */
.m-notes {
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 32px;
  border-radius: var(--radius-lg);
  background-color: var(--md-surface-container-low);
}

.m-notes h2 {
  font-family: var(--font-sans);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 14px;
  color: var(--md-on-surface);
}

.m-notes ul {
  margin: 0;
  padding-left: 20px;
  color: var(--md-on-surface-variant);
  font-size: 0.9rem;
  line-height: 1.8;
}

/* ---------- 页脚补一个次要链接样式 ---------- */
.footer-nav a {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
  .m-hero__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 40px;
  }

  .m-hero {
    padding: 48px 0 64px;
  }

  .m-features {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .m-download {
    grid-template-columns: minmax(0, 1fr);
  }

  .m-section {
    padding: 64px 0;
  }
}

@media (max-width: 720px) {
  .m-features {
    grid-template-columns: minmax(0, 1fr);
  }

  .m-shots {
    grid-template-columns: minmax(0, 1fr);
  }

  .m-shot--phone img {
    max-height: 460px;
  }

  /* 窄屏只留手机预览：桌面窗口截图缩到这个宽度会被裁得不自然 */
  .m-frame--window {
    display: none;
  }

  .m-frame--phone {
    position: static;
    width: min(62%, 220px);
    margin: 0 auto;
  }

  .m-hero__visual {
    padding-bottom: 0;
  }

  /* 元信息换行时不要在行首留下分隔点 */
  .m-hero__meta {
    gap: 6px 18px;
  }

  .m-hero__meta li + li::before {
    display: none;
  }

  .m-spec {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .m-hero__actions .btn {
    flex: 1 1 100%;
  }

  .m-notes {
    padding: 22px 20px;
  }
}