/* ============================================================
   树洞屋 - 全站样式(移动优先 · 温暖治愈风)
   ============================================================ */
:root{
  --bg:#f7f5ff;
  --card:#ffffff;
  --primary:#7c6ef2;
  --primary-dark:#5f50d6;
  --text:#3a3552;
  --muted:#8a87a3;
  --bubble-ai:#f1eefe;
  --bubble-me:#7c6ef2;
  --bubble-me-text:#fff;
  --radius:16px;
  --shadow:0 4px 18px rgba(124,110,242,.10);
}
*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);line-height:1.7;
}
a{color:var(--primary-dark);text-decoration:none}
.container{max-width:960px;margin:0 auto;padding:0 16px}

/* ---------- 头部 ---------- */
.site-header{background:var(--card);box-shadow:0 1px 0 rgba(0,0,0,.04);position:sticky;top:0;z-index:50}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:56px}
.logo{font-size:20px;font-weight:800;color:var(--primary);letter-spacing:.5px}
.logo-dot{color:var(--muted)}
.main-nav a{margin-left:18px;font-size:14px;color:var(--text);opacity:.85}
.main-nav a:hover{opacity:1}

/* ---------- Hero ---------- */
.hero{
  background:linear-gradient(160deg,#efeaff 0%,#f7f5ff 60%,#fdeef6 100%);
  padding:56px 0 48px;text-align:center;
}
.hero-tag{display:inline-block;background:#fff;color:var(--primary-dark);font-size:13px;
  padding:4px 14px;border-radius:999px;margin-bottom:16px;box-shadow:var(--shadow)}
.hero-title{font-size:30px;line-height:1.4;font-weight:800}
.hero-sub{max-width:560px;margin:16px auto 0;color:#5a5678;font-size:15px}
.hero-warning{margin-top:22px;font-size:12px;color:var(--muted)}
.hero-actions{margin-top:24px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* ---------- 按钮 ---------- */
.btn{display:inline-block;padding:12px 26px;border-radius:999px;font-size:15px;font-weight:600;
  border:1px solid transparent;cursor:pointer;transition:.2s}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 6px 16px rgba(124,110,242,.35)}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px)}
.btn-ghost{background:#fff;color:var(--text);border-color:#e4e0f7}
.btn-ghost:hover{border-color:var(--primary)}

/* ---------- 特点卡 ---------- */
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin:36px auto}
.feature-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;text-align:center}
.feature-ico{font-size:32px;margin-bottom:10px}
.feature-card h3{font-size:17px;margin-bottom:6px}
.feature-card p{font-size:14px;color:var(--muted)}

/* ---------- 区块标题 ---------- */
.section-title{font-size:22px;font-weight:800;text-align:center;margin:40px 0 6px}
.section-sub{text-align:center;color:var(--muted);font-size:14px;margin-bottom:18px}

/* ---------- 树洞广场 ---------- */
.wall-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px;margin-bottom:10px}
.wall-card{background:var(--card);border-radius:14px;padding:16px;box-shadow:var(--shadow);position:relative}
.wall-text{font-size:14px;color:var(--text)}
.wall-ago{font-size:11px;color:var(--muted);margin-top:10px}
.wall-empty{color:var(--muted);text-align:center;font-size:14px;grid-column:1/-1;padding:30px}

/* ---------- 情绪小知识 / SEO ---------- */
.tips-list .tip-item{background:var(--card);border-left:4px solid var(--primary);
  border-radius:8px;padding:12px 16px;margin-bottom:10px;font-size:14px;box-shadow:var(--shadow)}
.seo-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:10px}
.seo-grid a{background:var(--card);border-radius:10px;padding:12px 16px;font-size:14px;
  box-shadow:var(--shadow);transition:.2s}
.seo-grid a:hover{border-color:var(--primary);transform:translateY(-1px)}

/* ---------- CTA ---------- */
.cta{text-align:center;padding:40px 0 56px}
.cta h2{font-size:22px;margin-bottom:18px}

/* ---------- 底部 ---------- */
.site-footer{margin-top:48px;background:#2e2a4a;color:#c9c5e2;padding:32px 0 40px;font-size:13px}
.footer-links a{color:#e8e5ff;margin-right:14px;font-size:13px}
.footer-note{margin:14px 0 6px;color:#b9b4d8}
.footer-icp{color:#8f8ab0}
.footer-icp a{color:#b9b4d8}

/* ============================================================
   对话页
   ============================================================ */
.chat-body{background:var(--bg);height:100vh;overflow:hidden;display:flex;flex-direction:column}
.chat-shell{flex:1;display:flex;flex-direction:column;max-width:720px;margin:0 auto;width:100%;height:100%}
.chat-top{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;
  background:var(--card);box-shadow:0 1px 0 rgba(0,0,0,.05);z-index:10}
.chat-user{display:flex;align-items:center;gap:10px}
.chat-avatar{width:40px;height:40px;border-radius:50%;background:var(--bubble-ai);
  display:flex;align-items:center;justify-content:center;font-size:20px}
.chat-name{font-weight:700;font-size:15px}
.chat-online{color:#2fb572;font-size:11px;font-weight:400}
.chat-desc{font-size:11px;color:var(--muted)}
.btn-new{padding:6px 12px;border-radius:999px;border:1px solid #e4e0f7;background:#fff;
  font-size:12px;cursor:pointer;color:var(--text)}
.btn-new:hover{border-color:var(--primary)}

/* 消息区 */
.chat-msgs{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:12px;-webkit-overflow-scrolling:touch}
.msg{display:flex;align-items:flex-end;gap:8px}
.msg-ai{justify-content:flex-start}
.msg-me{justify-content:flex-end}
.msg-bubble{max-width:78%;padding:11px 14px;border-radius:16px;font-size:14.5px;line-height:1.65;
  word-break:break-word;white-space:pre-wrap}
.msg-ai .msg-bubble{background:var(--bubble-ai);border-bottom-left-radius:4px}
.msg-me .msg-bubble{background:var(--bubble-me);color:var(--bubble-me-text);border-bottom-right-radius:4px}
.msg-time{font-size:10px;color:var(--muted);margin-top:4px;text-align:right}
.typing .msg-bubble::after{content:"…";animation:blink 1s infinite}
@keyframes blink{50%{opacity:.2}}

/* 快捷话题 */
.chips{display:flex;gap:8px;padding:8px 16px;overflow-x:auto;scrollbar-width:none}
.chips::-webkit-scrollbar{display:none}
.chip{flex-shrink:0;padding:7px 14px;border-radius:999px;border:1px solid #e4e0f7;
  background:#fff;font-size:12.5px;color:var(--text);cursor:pointer;white-space:nowrap}
.chip:hover{border-color:var(--primary);color:var(--primary-dark)}

/* 输入区 */
.chat-input-wrap{padding:8px 16px calc(8px + env(safe-area-inset-bottom));background:var(--bg)}
.chat-input-box{display:flex;gap:8px;background:var(--card);border-radius:22px;padding:6px 6px 6px 16px;
  box-shadow:var(--shadow);align-items:flex-end}
.chat-input-box textarea{flex:1;border:none;outline:none;resize:none;font-size:15px;line-height:1.5;
  padding:8px 0;max-height:120px;background:transparent;font-family:inherit;color:var(--text)}
.btn-send{background:var(--primary);color:#fff;border:none;border-radius:999px;
  padding:10px 22px;font-size:14px;font-weight:600;cursor:pointer}
.btn-send:disabled{opacity:.5;cursor:not-allowed}
.input-hint{font-size:11px;color:var(--muted);text-align:center;margin-top:6px}

/* 弹窗 */
.modal{position:fixed;inset:0;background:rgba(40,36,70,.45);display:flex;
  align-items:center;justify-content:center;z-index:100;padding:20px}
.modal.hidden{display:none}
.modal-box{background:#fff;border-radius:18px;padding:26px;max-width:360px;width:100%;text-align:center}
.modal-box h3{font-size:18px;margin-bottom:10px}
.modal-box p{font-size:14px;color:var(--muted);margin-bottom:18px}
.modal-box b{color:var(--primary-dark)}

.chat-footer-min{text-align:center;font-size:11px;color:var(--muted);padding:6px 16px calc(6px + env(safe-area-inset-bottom));background:var(--bg)}
.chat-footer-min a{color:var(--muted);margin:0 4px}

/* ---------- 内容页通用 ---------- */
.article{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:28px 24px;margin:24px auto 0;max-width:860px}
.breadcrumb{font-size:12px;color:var(--muted);margin-bottom:14px}
.breadcrumb a{color:var(--muted)}
.article h1{font-size:24px;line-height:1.45;margin-bottom:10px}
.article .article-meta{font-size:12px;color:var(--muted);margin-bottom:18px;padding-bottom:14px;border-bottom:1px dashed #e8e5f5}
.article h2{font-size:19px;margin:26px 0 10px;color:var(--primary-dark)}
.article h3{font-size:16px;margin:18px 0 8px}
.article p,.article li{font-size:15px;color:#4c4866;margin-bottom:10px}
.article ul,.article ol{padding-left:22px;margin-bottom:12px}
.article blockquote{border-left:4px solid var(--primary);background:var(--bubble-ai);
  padding:10px 16px;border-radius:6px;margin:14px 0;font-size:14px;color:#5a5678}
.article .cta-inline{display:block;text-align:center;background:linear-gradient(160deg,#efeaff,#fdeef6);
  border-radius:14px;padding:22px;margin:26px 0 6px}
.article .cta-inline .btn{margin-top:10px}
.faq-item{margin-bottom:14px}
.faq-item h3{margin-bottom:4px}

@media (max-width:640px){
  .hero-title{font-size:25px}
  .hero{padding:40px 0 34px}
  .main-nav a{font-size:13px;margin-left:12px}
  .article{padding:22px 18px}
}