/* 7.0.9 · 首页（新对话空态）。
   语言沿用 boa.css 第 12 节：亚光实色面、黑白主色、克制的投影；
   Flagscape 浅弧只当底的「材质」，不抢字。深浅两套主题都自动换面。 */

/* ---- 空态主区：Flagscape 从底部扫上来 -------------------------------- */
.chat-main.is-empty {
  background-color: var(--bg);
  background-image: var(--fs-light);
  background-repeat: no-repeat;
  background-position: left bottom;
  background-size: 100% 50%;
}
[data-theme="dark"] .chat-main.is-empty { background-image: var(--fs-dark); }

/* 稳定居中：hero 区占满弹性空间，品牌块在里头永远正中；
   建议区钉在底部、列表自己滚 —— 换页签、卡片多少都不挪品牌的位置。 */
.chat-main.is-empty .chat-empty {
  flex: 1 1 auto; margin: 0 auto; padding: 24px 8px;
  width: 100%; max-width: min(47rem, 100%);
  display: flex; flex-direction: column; align-items: center;
}
.chat-main.is-empty .home-hero {
  flex: 1 0 auto; min-height: 7rem; width: 100%;
  display: grid; align-content: center; justify-items: center;
  gap: 20px; text-align: center;
}
.chat-main.is-empty .home-sugg {
  flex: none; width: 100%;
}
.chat-main.is-empty .home-sugg-list {
  max-height: 34vh; overflow-y: auto; overscroll-behavior: contain;
  scrollbar-width: thin; padding: 2px;
}
.chat-main.is-empty .chat-bar { margin-bottom: clamp(8px, 2.5vh, 22px); }
.chat-main.is-empty .chat-head h2 { visibility: hidden; }
.chat-main.is-empty .chat-warn { font-size: 12px; }

/* ---- 品牌区：Snap 重、Lab 轻 ----------------------------------------- */
.home-brand {
  display: flex; align-items: center; justify-content: center;
  gap: 18px; max-width: 100%; color: var(--k-ink, var(--ink));
}
.home-snappy { width: 92px; height: 92px; flex: none; overflow: visible; }
.home-wordmark {
  font-family: var(--boa-display, var(--f));
  font-size: clamp(42px, 4.9vw, 62px);
  font-weight: 300; letter-spacing: .01em; line-height: 1.1; white-space: nowrap;
}
.home-wordmark b { font-weight: 800; }
.chat-empty .home-tag { margin: 0; font-size: 15px; color: var(--dim); }

/* ---- 建议区：五组页签 + 当前组的问法卡片 ------------------------------- */
.home-sugg { display: grid; gap: 12px; width: 100%; margin-top: 4px; }
.home-sugg-tabs {
  display: flex; flex-wrap: wrap; gap: 6px; justify-content: center;
}
.home-sugg-tab {
  display: inline-flex; align-items: center; gap: 6px;
  font: inherit; font-size: 12.5px; font-weight: 600;
  padding: 6px 13px; cursor: pointer;
  border: 1px solid var(--k-line, var(--line)); border-radius: 999px;
  background: var(--card); color: var(--dim);
}
.home-sugg-tab .icon { width: 14px; height: 14px; }
.home-sugg-tab.on {
  background: var(--k-ink, var(--ink)); border-color: transparent;
  color: var(--bg);
}
.home-sugg-list {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px;
}
.home-q {
  font: inherit; font-size: 13.5px; line-height: 1.45; text-align: left;
  padding: 9px 14px; cursor: pointer;
  border: 1px solid var(--k-line, var(--line)); border-radius: 12px;
  background: var(--card); color: var(--dim);
  transition: border-color .16s ease, color .16s ease, transform .16s ease;
}
@media (hover: hover) {
  .home-q:hover { color: var(--ink); border-color: var(--dim2);
                  transform: translate3d(0, -1px, 0); }
  .home-sugg-tab:hover { color: var(--ink); border-color: var(--dim2); }
  .home-sugg-tab.on:hover { color: var(--bg); border-color: transparent; }
}
.home-q:focus-visible, .home-sugg-tab:focus-visible {
  outline: 2px solid var(--blue); outline-offset: 1px;
}
@media (prefers-reduced-motion: reduce) { .home-q { transition: none; } }

/* ---- 输入条：整条收成一个胶囊 ----------------------------------------- */
.chat-main .chat-bar {
  gap: 4px; padding: 5px; margin: 2px 0 6px;
  border: 1px solid var(--k-line, var(--line));
  border-radius: 999px; background: var(--card);
  box-shadow: var(--matte-sh, 0 1px 2px rgb(0 0 0 / 5%));
}
.chat-main .chat-bar input {
  min-width: 0; border: 0; background: transparent; padding: 9px 12px;
}
.chat-main .chat-bar input:focus-visible { outline: none; }
.chat-main .chat-bar:focus-within {
  border-color: var(--k-ink, var(--dim2));
  box-shadow: var(--matte-sh2, 0 4px 16px rgb(0 0 0 / 8%));
}
.chat-main .chat-bar button { width: 40px; height: 40px; }
.chat-main .chat-bar #chatGo {
  background: var(--k-ink, var(--blue)); color: var(--bg);
}
.chat-main .chat-bar .chat-imgbtn {
  position: relative; width: 40px; height: 40px; flex: none;
  background: var(--soft); border: 0; border-radius: 50%; color: var(--dim);
}
.chat-main .chat-bar .chat-imgbtn .icon { width: 26px; height: 26px; stroke: none; }
.chat-img-plus {
  position: absolute; right: -2px; bottom: -1px; display: grid; place-items: center;
  width: 16px; height: 16px; border-radius: 50%; background: var(--cyan);
  color: #172b29; border: 2px solid var(--card); font: 600 13px/1 var(--f);
}
.chat-main #upQ { flex: none; max-height: 150px; overflow-y: auto; }
/* 待发图条：跟胶囊输入条同一个面，别飘一条裸条在上头 */
.chat-main .chat-attach {
  flex: none; max-height: 150px; overflow-y: auto;
  gap: 10px; padding: 8px 10px; margin: 0 0 6px;
  background: var(--card); border: 1px solid var(--k-line, var(--line));
  border-radius: 16px;
}

/* 没配模型时的提示：做成胶囊提示，别裸挂一行黄字 */
.chat-empty .chat-warn {
  margin: 0; padding: 7px 16px; border-radius: 999px;
  background: var(--amber-s, #FFF4E0); border: 1px solid var(--amber, #E8A33D);
  font-size: 12.5px; font-weight: 600; color: var(--amber-d);
}

/* 回答卡与「接着可以」的 chips：跟亚光面统一 */
.chat-main .chat-it { box-shadow: var(--matte-sh, 0 1px 2px rgb(0 0 0 / 5%)); }
.chat-main .chat-chip { transition: border-color .16s ease, color .16s ease,
                                    transform .16s ease; }
@media (hover: hover) {
  .chat-main .chat-chip:hover { transform: translate3d(0, -1px, 0); }
}
.home-sugg-tab { transition: border-color .16s ease, color .16s ease,
                            background-color .16s ease; }

/* ---- 侧栏：选中态一条墨色左指示，克制 ------------------------------- */
.chat-sess.on {
  background: var(--k-soft2, var(--soft));
  box-shadow: inset 3px 0 0 var(--k-ink, var(--ink));
}

/* ---- 响应式 ---------------------------------------------------------- */
@media (max-width: 860px) {
  .chat-side { visibility: hidden; }
  .side-on .chat-side { visibility: visible; }
  .home-snappy { width: 78px; height: 78px; }
  .home-wordmark { font-size: clamp(36px, 8vw, 52px); }
  .home-brand { gap: 14px; }
}
@media (max-width: 760px) {
  .bar { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .bar a { min-width: 0; }
}
@media (max-width: 560px) {
  .home-sugg-list { grid-template-columns: 1fr; }
  .home-q { padding: 8px 13px; }
}
@media (max-width: 380px) {
  .home-snappy { width: 64px; height: 64px; }
  .home-wordmark { font-size: 32px; }
  .home-brand { gap: 11px; }
  .home-sugg-tab { font-size: 12px; padding: 5px 11px; }
}
/* 矮屏：hero 允许收缩，建议区压低一点 */
@media (max-height: 560px) {
  .home-snappy { width: 58px; height: 58px; }
  .home-wordmark { font-size: 34px; }
  .chat-main.is-empty .chat-empty { padding: 10px 8px; }
  .chat-main.is-empty .home-hero { gap: 12px; min-height: 4rem; }
  .chat-main.is-empty .home-sugg-list { max-height: 26vh; }
  .chat-main.is-empty .chat-canvas { padding-bottom: 8px; }
  .chat-main.is-empty .chat-bar { margin-bottom: 4px; }
}