/* ============ 家园畅聊 · 分发页（telegram.org 式排版：居中大留白 + 卡片） ============ */
:root {
  --bg: #ffffff;
  --bg-alt: #f7f8fa;
  --ink: #1f2329;
  --ink-2: #56606b;
  --ink-3: #8a95a1;
  --line: rgba(20, 30, 40, .08);
  --card: #ffffff;
  --primary: #ff6a4d;
  --primary-2: #ff4f81;
  --grad: linear-gradient(135deg, #ff7a59 0%, #ff4f81 100%);
  --grad-soft: linear-gradient(135deg, rgba(255, 122, 89, .1), rgba(255, 79, 129, .1));
  --shadow: 0 10px 34px rgba(35, 25, 20, .08);
  --shadow-lg: 0 24px 60px rgba(35, 25, 20, .14);
  --nav-bg: rgba(255, 255, 255, .82);
}
:root[data-theme="dark"] {
  --bg: #14171c;
  --bg-alt: #1a1e25;
  --ink: #eef1f4;
  --ink-2: #aeb7c2;
  --ink-3: #6f7a86;
  --line: rgba(255, 255, 255, .08);
  --card: #1f242c;
  --shadow: 0 10px 34px rgba(0, 0, 0, .35);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, .5);
  --nav-bg: rgba(20, 23, 28, .82);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
/* 防止 .news-more 等设置了 display 的类覆盖 hidden 属性 */
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 70px; }
body {
  font-family: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--ink); line-height: 1.6;
  transition: background .25s, color .25s;
}
a { color: inherit; text-decoration: none; }
button { border: none; background: none; cursor: pointer; font-family: inherit; color: inherit; }
.wrap { max-width: 1000px; margin: 0 auto; padding: 0 22px; }

/* ---------- 顶栏 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--nav-bg); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-in { display: flex; align-items: center; gap: 22px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 17px; }
.brand-logo { display: flex; width: 28px; height: 28px; border-radius: 8px; overflow: hidden; flex: none; }
.brand-logo img { width: 100%; height: 100%; object-fit: cover; }
/* 未设置 Logo 时的默认形象：渐变底 + 白色小屋（.hero-logo.logo-df 提高优先级，防止被 .hero-logo 的 var(--card) 白底覆盖，浅色主题下白色小屋会隐形） */
.logo-df, .hero-logo.logo-df { background: var(--grad); align-items: center; justify-content: center; }
.logo-df svg { width: 62%; height: 62%; fill: #fff; }
.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a { padding: 7px 13px; border-radius: 9px; font-size: 14.5px; color: var(--ink-2); transition: .15s; }
.nav-links a:hover { background: var(--grad-soft); color: var(--primary); }
.nav-acts { display: flex; align-items: center; gap: 8px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 7px 12px; border-radius: 99px;
  font-size: 13px; color: var(--ink-2); background: var(--bg-alt); border: 1px solid var(--line); transition: .15s;
}
.chip:hover { color: var(--primary); border-color: var(--primary); }
.chip svg { width: 16px; height: 16px; fill: currentColor; display: block; flex: none; }
.chip-ic { display: flex; }
.theme-btn, .menu-btn { padding: 7px 9px; }
.menu-btn { display: none; }
.lang { position: relative; }
.lang-menu {
  position: absolute; right: 0; top: 40px; min-width: 130px; padding: 6px;
  background: var(--card); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow-lg);
}
.lang-menu button { display: block; width: 100%; text-align: left; padding: 9px 13px; border-radius: 8px; font-size: 14px; }
.lang-menu button:hover, .lang-menu button.on { background: var(--grad-soft); color: var(--primary); }

/* ---------- 公告条 ---------- */
.announce { background: var(--grad); color: #fff; font-size: 13.5px; padding: 9px 0; text-align: center; }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding: 84px 0 70px; text-align: center; }
.hero-blob {
  position: absolute; left: 50%; top: -260px; transform: translateX(-50%);
  width: 900px; height: 560px; border-radius: 50%; filter: blur(90px); opacity: .16;
  background: var(--grad); pointer-events: none;
}
.hero-in { position: relative; }
.hero-logo {
  width: 110px; height: 110px; margin: 0 auto 26px; border-radius: 30px;
  background: var(--card); box-shadow: var(--shadow-lg);
  display: flex; align-items: center; justify-content: center; overflow: hidden;
}
.hero-logo img { width: 100%; height: 100%; object-fit: cover; }
.hero-name { font-size: 42px; font-weight: 900; letter-spacing: 2px; }
.hero-slogan { font-size: 18px; color: var(--ink-2); margin-top: 14px; }
.hero-btns { display: flex; gap: 14px; justify-content: center; margin-top: 34px; flex-wrap: wrap; }
.btn-main {
  display: inline-flex; align-items: center; gap: 9px; padding: 15px 38px; border-radius: 99px;
  background: var(--grad); color: #fff; font-size: 16.5px; font-weight: 700; letter-spacing: 1px;
  box-shadow: 0 10px 28px rgba(255, 95, 110, .35); transition: transform .15s;
}
.btn-main:hover { transform: translateY(-2px); }
.btn-main svg { width: 20px; height: 20px; fill: currentColor; flex: none; }
.btn-sub {
  display: inline-flex; align-items: center; padding: 15px 30px; border-radius: 99px;
  font-size: 15.5px; font-weight: 600; color: var(--primary); background: var(--grad-soft); transition: .15s;
}
.btn-sub:hover { filter: brightness(1.05); }
.hero-plats { margin-top: 26px; font-size: 13.5px; color: var(--ink-3); display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; }
.hero-plats a { color: var(--ink-3); border-bottom: 1px dashed var(--line); }
.hero-plats a:hover { color: var(--primary); }

/* ---------- 区块 ---------- */
.sec { padding: 66px 0; }
.sec-alt { background: var(--bg-alt); }
.sec-title { text-align: center; font-size: 28px; font-weight: 900; margin-bottom: 40px; letter-spacing: 1px; }

/* 为什么选择 */
.feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feat {
  background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 26px 24px;
  transition: transform .18s, box-shadow .18s;
}
.feat:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.feat-ic { font-size: 34px; }
.feat-t { font-size: 16.5px; font-weight: 800; margin-top: 12px; }
.feat-d { font-size: 13.5px; color: var(--ink-2); margin-top: 7px; }

/* 下载 */
.dl-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.dl-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 26px 20px;
  text-align: center; display: flex; flex-direction: column; align-items: center; gap: 6px;
  transition: transform .18s, box-shadow .18s;
}
.dl-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.dl-ic { width: 52px; height: 52px; color: var(--primary); }
.dl-ic svg { width: 100%; height: 100%; fill: currentColor; }
.dl-name { font-size: 16px; font-weight: 800; margin-top: 6px; }
.dl-note { font-size: 12.5px; color: var(--ink-3); min-height: 18px; }
.dl-btn {
  margin-top: 12px; display: inline-block; padding: 10px 26px; border-radius: 99px;
  background: var(--grad); color: #fff; font-size: 14px; font-weight: 700; transition: transform .15s;
}
.dl-btn:hover { transform: scale(1.04); }
.dl-ver { font-size: 12px; color: var(--ink-3); margin-top: 8px; }
/* iOS 待开发：整卡灰度占位，不可点 */
.dl-card.dl-wip { opacity: .55; filter: grayscale(1); }
.dl-card.dl-wip:hover { transform: none; box-shadow: none; }
.dl-btn.wip { background: var(--bg-alt); color: var(--ink-3); cursor: default; border: 1px solid var(--line); }
.dl-btn.wip:hover { transform: none; }

/* 动态 */
.news-list { max-width: 720px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.news-item { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 20px 24px; cursor: pointer; transition: border-color .15s; }
.news-item:hover { border-color: var(--primary); }
.news-item.static { cursor: default; }
.news-item.static:hover { border-color: var(--line); }
.news-date { font-size: 12.5px; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.news-t { font-size: 16.5px; font-weight: 800; margin-top: 4px; display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.news-caret { font-size: 13px; color: var(--ink-3); transition: transform .2s; flex: none; }
.news-item.open .news-caret { transform: rotate(180deg); color: var(--primary); }
.news-b {
  font-size: 14px; color: var(--ink-2); margin-top: 8px; white-space: pre-wrap; word-break: break-word;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.news-item.open .news-b, .news-b.open { display: block; overflow: visible; }
.news-more { display: block; margin: 22px auto 0; padding: 10px 30px; border-radius: 99px; background: var(--grad-soft); color: var(--primary); font-size: 14px; font-weight: 700; }

/* FAQ */
.faq-list { max-width: 720px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item { background: var(--card); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.faq-item summary {
  list-style: none; cursor: pointer; padding: 17px 22px; font-size: 15.5px; font-weight: 700;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-size: 20px; color: var(--ink-3); transition: transform .2s; flex: none; }
.faq-item[open] summary::after { transform: rotate(45deg); color: var(--primary); }
.faq-a { padding: 0 22px 18px; font-size: 14px; color: var(--ink-2); white-space: pre-wrap; word-break: break-word; }

/* ---------- 底部 ---------- */
.foot { border-top: 1px solid var(--line); padding: 30px 0 44px; text-align: center; font-size: 13px; color: var(--ink-3); }
.foot a { color: var(--ink-2); }
.foot a:hover { color: var(--primary); }

/* ---------- 移动端 ---------- */
@media (max-width: 860px) {
  .feat-grid { grid-template-columns: repeat(2, 1fr); }
  .dl-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .nav-links {
    display: none; position: absolute; left: 0; right: 0; top: 60px; flex-direction: column;
    background: var(--nav-bg); backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); padding: 8px 14px 14px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; font-size: 15px; }
  .menu-btn { display: inline-flex; }
  .hero { padding: 56px 0 48px; }
  .hero-name { font-size: 32px; }
  .hero-slogan { font-size: 15.5px; padding: 0 10px; }
  .hero-logo { width: 92px; height: 92px; font-size: 52px; border-radius: 26px; }
  .btn-main { padding: 14px 30px; font-size: 15.5px; }
  .sec { padding: 46px 0; }
  .sec-title { font-size: 23px; margin-bottom: 28px; }
  .feat-grid { grid-template-columns: 1fr; }
  .dl-grid { grid-template-columns: 1fr; }
  .lang-cur-txt { display: none; }
}