/* =========================================================================
 * mobile.css —— 手机端全局适配（在 index.html 中最后引入，起兜底作用）
 * -------------------------------------------------------------------------
 * 窄屏下统一处理：
 *   1. 各栏目内容区可纵向滚动，避免内容被固定屏幕裁剪，滚动条隐藏保持干净；
 *   2. 研究栏目等的侧边导航改为水平排布，贴近触屏操作习惯；
 *   3. 微调字号、间距、装饰元素，保证小屏下的阅读与点按体验。
 * ========================================================================= */

/* —— 窄屏 / 低高度：让各栏目「屏幕本身」成为滚动容器 ——
 * 各栏目是 position:fixed 的全屏容器。内容放不下时，若只给子元素设置
 * overflow-y:auto 是无效的（子元素高度自适应会被内容撑大），必须滚动屏幕
 * 本身，否则超出部分被 overflow:hidden 裁剪且无法滚动、按钮点不到。
 * 覆盖手机横屏（宽度可达 ~930px）与矮窗口桌面。 */
@media (max-width: 1100px), (max-height: 720px) {
  .homepage-screen,
  .headquarters-screen,
  .member-screen,
  .department-screen,
  .research-screen {
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
  }

  .homepage-screen::-webkit-scrollbar,
  .headquarters-screen::-webkit-scrollbar,
  .member-screen::-webkit-scrollbar,
  .department-screen::-webkit-scrollbar,
  .research-screen::-webkit-scrollbar {
    display: none;
  }
}

/* —— 移动端通用修复（窄屏或矮屏横屏手机）——
 * 1. 页脚是绝对定位在「首屏底部」的，滚动内容会与文字重叠，移动端直接隐藏；
 * 2. 关于页背景用绝对定位只铺满一屏，滚动后下半页没有背景，改为固定铺满视口；
 * 3. 纳新轮播的非当前卡片用 3D 叠放，小屏会互相压住、图片盖住文字，仅保留当前卡。 */
@media (max-width: 820px), (max-height: 560px) {
  .screen-footer {
    display: none;
  }

  .headquarters-screen__bg,
  .headquarters-screen__veil {
    position: fixed;
  }

  .member-card:not(.is-active) {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
  }

  .homepage-screen__content,
  .headquarters-screen__content,
  .member-screen__content,
  .department-screen__content,
  .research-screen__content {
    padding-bottom: 3.4rem; /* 页脚已隐藏，无需预留底部空间 */
  }
}

/* —— 手机小屏：进一步收紧 —— */
@media (max-width: 560px) {
  /* 品牌标记更紧凑，避免挤压 */
  .enter-screen .brand-mark,
  .homepage-screen .brand-mark,
  .headquarters-screen .brand-mark,
  .member-screen .brand-mark,
  .department-screen .brand-mark,
  .research-screen .brand-mark,
  .particle-screen .brand-mark {
    top: 1.2rem;
    left: 1.2rem;
    right: 1.2rem;
  }

  .brand-mark__title {
    font-size: 1.7rem;
  }

  .brand-mark__meta {
    font-size: 0.72rem;
  }

  /* 首页简介与标题字号微调 */
  .homepage-copy__title {
    font-size: 2.4rem;
  }

  .homepage-copy__line {
    font-size: 0.92rem;
  }

  /* 授权过场字体 */
  .auth-screen__headline {
    font-size: 1.05rem;
    letter-spacing: 0.12em;
  }

  /* 进入页标题 */
  .enter-panel__title {
    font-size: 1.9rem;
  }

  /* 方向面板标题 */
  .department-panel__title {
    font-size: 1.8rem;
  }

  /* 研究面板标题 */
  .research-panel__title {
    font-size: 1.7rem;
  }

  /* 互动（粒子）页：小屏时隐藏右上角装饰徽标，避免与状态栏/品牌重叠 */
  .particle-screen__badge {
    display: none;
  }

  .particle-screen__status {
    top: 0.9rem;
    font-size: 11px;
    padding: 6px 12px;
    max-width: 56vw;
    text-align: center;
  }

  .particle-screen__hint {
    font-size: 11px;
  }
}

/* =========================================================================
 * 手机横屏（矮屏）：排版优化
 * -------------------------------------------------------------------------
 * 手机被 landscape.js 强制横屏后高度通常只有 320~420px。此时若沿用桌面
 * 的大留白（顶部 8~9rem）与大标题，会显得空旷、需要不停滚动。这里仅对
 * 「视口高度 ≤ 560px 的设备」收紧留白、字号与装饰；桌面窗口高度普遍更大，
 * 不受影响。
 * ========================================================================= */
@media (max-height: 560px) {
  /* —— 各栏目内容：收紧上下留白 —— */
  .enter-screen__content,
  .homepage-screen__content,
  .headquarters-screen__content,
  .member-screen__content,
  .department-screen__content,
  .research-screen__content {
    padding-top: 4.6rem;
    padding-bottom: 3.4rem;
  }

  /* —— 品牌标识更紧凑（用屏幕前缀提高优先级，覆盖各栏目自带的定位）—— */
  .enter-screen .brand-mark,
  .homepage-screen .brand-mark,
  .headquarters-screen .brand-mark,
  .member-screen .brand-mark,
  .department-screen .brand-mark,
  .research-screen .brand-mark,
  .particle-screen .brand-mark {
    top: 1.1rem;
    left: 1.4rem;
    right: 1.4rem;
  }

  .brand-mark__title {
    font-size: 1.5rem;
  }

  .brand-mark__meta {
    font-size: 0.64rem;
    letter-spacing: 0.14em;
  }

  /* —— 进入页：横屏（宽而矮）改为左右两栏，让「进入」按钮一屏可见 —— */
  .enter-screen__content {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: center;
    justify-items: stretch;
    gap: 1.4rem;
    padding-top: 4.2rem;
    padding-bottom: 1.6rem;
  }

  .logo-stage {
    min-height: 0;
  }

  .logo-stage__image {
    width: min(16rem, 44vh);
  }

  .enter-panel {
    justify-self: start;
    width: auto;
    max-width: 24rem;
    padding: 0;
    text-align: left;
  }

  .enter-panel__copy {
    margin-left: 0;
    margin-right: 0;
  }

  .enter-panel__title {
    font-size: clamp(1.7rem, 6.4vh, 2.3rem);
  }

  .enter-panel__copy {
    margin-top: 0.8rem;
    font-size: 0.86rem;
    line-height: 1.7;
  }

  .enter-button {
    margin-top: 1.6rem;
  }

  .enter-button__core {
    width: 4.4rem;
    height: 4.4rem;
  }

  /* —— 首页：标题与快捷入口收紧 —— */
  .homepage-screen__content {
    gap: 1.2rem;
  }

  .homepage-copy__title {
    font-size: clamp(1.9rem, 7.4vh, 2.7rem);
  }

  .homepage-copy__line {
    font-size: 0.9rem;
    line-height: 1.65;
  }

  .homepage-copy__experience,
  .quick-links {
    margin-top: 1.2rem;
  }

  /* 首页：文案在左、装饰图形在右（缩小后不再撑高页面） */
  .homepage-screen__content {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: center;
    column-gap: 1.4rem;
  }

  .homepage-visual {
    width: min(20rem, 40vw);
  }

  .homepage-screen .side-nav {
    grid-column: 1 / -1;
  }

  /* —— 关于：简介与按钮收紧 —— */
  .headquarters-copy__title {
    font-size: clamp(1.9rem, 7.4vh, 2.7rem);
  }

  .headquarters-copy__summary {
    margin-top: 0.9rem;
    font-size: 0.9rem;
    line-height: 1.7;
  }

  .headquarters-copy__status {
    margin-top: 1.1rem;
    padding: 0.7rem 0.8rem;
  }

  .headquarters-actions {
    margin-top: 1.3rem;
    gap: 0.7rem;
  }

  .command-button {
    min-width: 0;
    padding: 0.8rem 1.3rem;
  }

  /* —— 纳新：卡片贴合屏幕高度并压缩内容，避免图片/文字溢出压到导航 —— */
  .member-carousel {
    min-height: 0;
  }

  .member-carousel__stage {
    width: min(22rem, 62vh);
    height: min(31rem, 80vh);
  }

  .member-card {
    padding: 0.9rem;
  }

  .member-card__art {
    height: 7rem;
    margin: 0.5rem 0;
  }

  .member-card__art img {
    min-width: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  .member-card__title {
    font-size: 1.45rem;
  }

  .member-card__role {
    margin-top: 0.35rem;
    font-size: 0.66rem;
    letter-spacing: 0.18em;
  }

  .member-card__desc {
    margin-top: 0.5rem;
    font-size: 0.8rem;
    line-height: 1.6;
  }

  /* —— 方向：左列卡片、右列信息面板，充分利用横向空间、减少滚动 —— */
  .department-screen__content {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    grid-template-rows: auto auto;
    align-content: start;
    align-items: center;
    column-gap: 1.2rem;
    row-gap: 0.7rem;
  }

  .department-cluster {
    position: static;
    width: auto;
    height: auto;
    transform: none;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.55rem;
    margin: 0;
  }

  .department-cluster--left {
    grid-column: 1;
    grid-row: 1;
    left: auto;
  }

  .department-cluster--right {
    grid-column: 1;
    grid-row: 2;
    right: auto;
  }

  .department-panel {
    grid-column: 2;
    grid-row: 1 / span 2;
    align-self: center;
    width: auto;
    max-width: none;
    min-height: 0;
    margin: 0;
    padding: 1.6rem 1.4rem;
    transform: none;
  }

  .department-card {
    position: static;
    transform: none !important;
    width: auto;
    height: auto;
    min-height: 4.8rem;
    padding: 0.6rem 0.7rem;
  }

  .department-card__code {
    font-size: 1.5rem;
  }

  .department-card__desc {
    padding-top: 0.6rem;
  }

  .department-panel__title {
    margin-top: 0.5rem;
    font-size: 1.7rem;
  }

  /* —— 活动：左列计划面板、右列信息卡，竖向空间减半 —— */
  .research-screen__content {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-content: start;
    align-items: start;
    column-gap: 1.2rem;
  }

  .research-screen .side-nav--light {
    grid-column: 1 / -1;
  }

  .research-panel__title {
    font-size: clamp(1.5rem, 5.6vh, 2rem);
  }

  .research-progress {
    margin-top: 1.2rem;
    gap: 1rem;
  }

  /* 点阵的尺寸由 --circle-size/--gap 决定，必须一起缩小，
   * 否则 5×5 点阵（176px）会超出圆壳、盖住右侧「计划进度」文字 */
  .research-progress__grid {
    --circle-size: 21px;
    --gap: 3px;
  }

  .research-progress__shell {
    width: 128px;
    height: 128px;
  }

  .research-progress__label {
    font-size: 0.74rem;
  }

  .research-progress__value {
    font-size: 1.9rem;
  }

  .research-panel__quote {
    margin-top: 1.2rem;
    font-size: 0.88rem;
    line-height: 1.75;
  }

  .research-panel__button {
    margin-top: 1.2rem;
    padding: 0.8rem 1.1rem;
  }

  .research-info {
    margin-top: 0;
  }

  /* —— 侧边导航：更紧凑，避免占据过多高度 —— */
  .side-nav {
    gap: 0.9rem 1.4rem;
  }

  .side-nav__item {
    font-size: 0.82rem;
  }

  /* —— 页脚：更贴底、更小 —— */
  .screen-footer {
    bottom: 0.9rem;
    font-size: 0.72rem;
  }
}