/* ══════════════════════════════════════════════
   Echo 回响 · css/composer.css
   底部输入区 + 回到最新胶囊
   ══════════════════════════════════════════════ */
  /* ── Composer ── */
  .composer{
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 100;
    width: min(100vw, var(--ref-width));
    margin: 0 auto;
    display:flex; align-items:center; gap: clamp(6px, 1vw, 12px);
    background: transparent; border:none;
    padding: 0 var(--side-pad) clamp(10px, 1.6vw, 18px);
    padding-bottom: calc(clamp(10px, 1.6vw, 18px) + env(safe-area-inset-bottom));
    transform: translate3d(0, calc(-1 * var(--keyboard-offset)), 0);
    -webkit-transform: translate3d(0, calc(-1 * var(--keyboard-offset)), 0);
    transition: transform .28s cubic-bezier(.2,.8,.2,1);
  }
  .floatbtn{
    flex:none; width: clamp(36px, 5vw, 48px); height: clamp(36px, 5vw, 48px); border-radius:50%;
    border: none; background: transparent;
    color: var(--accent); display:grid; place-items:center; cursor:pointer; padding:0;
    transition: transform .15s ease, color .2s ease;
  }
  .floatbtn:active{ transform: scale(.9); color: var(--text); }
  .floatbtn:hover{ color: var(--text); }
  .floatbtn svg{ width: clamp(20px, 2.8vw, 28px); height: clamp(20px, 2.8vw, 28px); display:block; }
  .floatbtn.send{
    background: var(--send-bg);
    color:#ffffff;
    box-shadow: 0 16px 32px rgba(41, 60, 78, 0.22);
  }
  .floatbtn.send:hover{ color:#ffffff; }
  .floatbtn.send:active{ transform: scale(.97); }      /* 发送键按压:轻收 3%(比通用 .floatbtn 的 .9 克制) */
  @keyframes send-go{ from{ transform: scale(.96); } to{ transform: scale(1); } }
  .floatbtn.send.send-go{ animation: send-go .22s cubic-bezier(.2,.8,.2,1); }
  @media (prefers-reduced-motion: reduce){ .floatbtn.send.send-go{ animation: none; } }
  .composer .field{
    flex:1 1 auto; display:flex; align-items:center; gap: clamp(4px, 0.8vw, 10px);
    background: var(--field-bg);
    border: 1px solid var(--field-line);
    border-radius: 999px;
    padding: clamp(4px, 0.6vw, 8px) clamp(8px, 1.2vw, 14px) clamp(4px, 0.6vw, 8px) clamp(10px, 1.5vw, 16px);
    min-height: clamp(42px, 5.5vw, 56px);
    box-shadow: var(--shadow);
    transition: border-color .2s ease;
  }
  .composer .field:focus-within{ border-color: var(--field-line); }
  .composer textarea:focus,
  .composer textarea:focus-visible,
  .composer button:focus-visible{
    outline: none;
  }
  textarea{
    flex:1 1 auto; border:none; outline:none; resize:none; background:transparent;
    color: var(--text); font-family: var(--font-en), var(--font-cn); font-size: clamp(15px, 2vw, 18px); line-height:1.35;
    max-height: 110px; padding: 6px 0; margin:0;
  }
  textarea::placeholder{ color: var(--text-faint); opacity: 1; }
  .emojibtn{
    flex:none; width: clamp(28px, 3.8vw, 38px); height: clamp(28px, 3.8vw, 38px); border:none; background:transparent;
    color: var(--accent); display:grid; place-items:center; cursor:pointer; padding:0;
    transition: transform .15s ease, color .2s ease;
  }
  .emojibtn:active{ transform: scale(.85); color: var(--text); }
  .emojibtn:hover{ color: var(--text); }
  .emojibtn svg{ width: clamp(22px, 3vw, 30px); height: clamp(22px, 3vw, 30px); display:block; }
  /* ── 回到最新 · 翻历史时来新消息,底部悬浮一枚安静的半透明胶囊 ── */
  .newmsg-pill{
    position: fixed; left: 50%; z-index: 90;
    bottom: calc(clamp(78px, 13vw, 96px) + env(safe-area-inset-bottom));
    display: inline-flex; align-items: center; gap: 5px;
    padding: 7px 14px 7px 11px; border: none; border-radius: 999px;
    background: rgba(34, 46, 60, .52); color: #fff;
    font-family: var(--font-en), var(--font-cn); font-size: 13px; line-height: 1; letter-spacing: .01em;
    -webkit-backdrop-filter: blur(10px) saturate(1.2); backdrop-filter: blur(10px) saturate(1.2);
    box-shadow: 0 8px 24px rgba(18, 28, 40, .26);
    cursor: pointer; opacity: 0; pointer-events: none;
    transform: translate3d(-50%, calc(8px - var(--keyboard-offset, 0px)), 0);
    transition: opacity .2s ease, transform .28s cubic-bezier(.2,.8,.2,1);
  }
  .newmsg-pill.show{ opacity: 1; pointer-events: auto; transform: translate3d(-50%, calc(-1 * var(--keyboard-offset, 0px)), 0); }
  .newmsg-pill svg{ width: 15px; height: 15px; flex: none; }
  @media (prefers-reduced-motion: reduce){ .newmsg-pill{ transition: opacity .2s ease; } }