/* ============================================================
   I Ching Oracle — 留言板（forum.html）
   ------------------------------------------------------------
   配色/字体沿用 bagua-card-demo.html 的 :root 变量（forum.html 里
   逐字抄了一份），和画廊页 card-gallery.html 同一套做法 ——
   页面之间跳转不能有色差。

   会员相关的样式（导航入口、登录弹窗）在 member.css 里，不重复定义。
   ============================================================ */

/* 🔴 别删。`hidden` 靠 UA 的 [hidden]{display:none} 生效，而作者样式表
   无条件胜过 UA 样式表 —— .signin-strip / .more-wrap 都声明了 display:flex，
   于是 el.hidden = true 只是设了个属性，元素照样显示。
   症状极阴：断言 el.hidden === true 会绿着通过。 */
[hidden]{display:none !important}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--ink); color:var(--text); min-height:100vh;
  font-family:var(--sans); overflow-x:hidden;
  background-image:
    radial-gradient(ellipse 90% 55% at 50% -8%,rgba(107,139,167,.13),transparent 62%),
    radial-gradient(ellipse 70% 45% at 88% 78%,rgba(55,125,184,.055),transparent 60%),
    radial-gradient(ellipse 60% 40% at 6% 92%,rgba(169,76,75,.035),transparent 60%);
  background-attachment:fixed;
}
.grain{position:fixed;inset:0;pointer-events:none;z-index:2;opacity:.040;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E")}
a{color:inherit}

/* ---------- 导航（和主站一致） ---------- */
nav{position:fixed;top:0;left:0;right:0;z-index:40;
  display:flex;align-items:center;justify-content:space-between;
  padding:14px clamp(16px,4vw,42px);
  background:rgba(7,8,9,.72);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none}
.brand-mark{width:26px;height:26px;border-radius:50%;flex:0 0 auto;position:relative;
  background:conic-gradient(from 180deg,var(--gold) 0 50%,#141a2a 50% 100%);
  box-shadow:0 0 0 1px rgba(201,185,138,.5),0 0 16px rgba(201,185,138,.24)}
.brand-mark::before,.brand-mark::after{content:"";position:absolute;width:13px;height:13px;border-radius:50%}
.brand-mark::before{top:0;left:6.5px;background:#141a2a}
.brand-mark::after{bottom:0;left:6.5px;background:var(--gold)}
.brand-name{font-family:var(--serif);font-size:.95rem;letter-spacing:.30em;text-transform:uppercase}
.nav-links{display:flex;align-items:center;gap:clamp(12px,2.4vw,28px)}
.nav-links a{color:var(--muted);text-decoration:none;font-size:.72rem;letter-spacing:.16em;
  text-transform:uppercase;transition:color .22s;position:relative;padding:4px 0}
.nav-links a:hover{color:var(--gold-hi)}
/* 当前页高亮 */
.nav-links a.here{color:var(--gold-hi)}
.nav-links a.here::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--gold)}
.nav-cta{padding:8px 16px;border:1px solid var(--line2);border-radius:999px;
  background:transparent;color:var(--gold);font-family:var(--sans);font-size:.68rem;
  letter-spacing:.16em;text-transform:uppercase;cursor:pointer;
  transition:background .24s,border-color .24s,color .24s}
.nav-cta:hover{background:rgba(201,185,138,.12);border-color:var(--gold);color:var(--gold-hi)}
@media(max-width:720px){.nav-links a{display:none}.nav-links .nav-cta{display:inline-block}}

/* ---------- 页头 ---------- */
.shell{position:relative;z-index:3;max-width:820px;margin:0 auto;
  padding:calc(var(--nav-h) + 62px) clamp(16px,4vw,28px) 96px}
.sec-head{text-align:center}
.sec-num{font-family:var(--serif);font-size:.72rem;letter-spacing:.42em;
  color:var(--muted2);margin-bottom:14px}
.sec-head h1{font-family:var(--serif);font-weight:400;
  font-size:clamp(1.9rem,6vw,3rem);letter-spacing:.14em;text-transform:uppercase;
  color:var(--gold-hi);line-height:1.1}
.sec-sub{color:var(--muted);font-size:.72rem;letter-spacing:.16em;margin-top:14px;line-height:1.9}
.divider{display:flex;align-items:center;justify-content:center;gap:12px;margin:22px 0 0}
.divider span{height:1px;width:64px;background:linear-gradient(90deg,transparent,var(--line2))}
.divider span:last-child{background:linear-gradient(90deg,var(--line2),transparent)}
.divider i{width:5px;height:5px;border-radius:50%;background:var(--gold);box-shadow:0 0 10px var(--gold)}

/* ---------- 发帖区 ---------- */
.composer{margin-top:40px;border:1px solid var(--line);border-radius:14px;
  background:rgba(14,15,30,.66);padding:18px 18px 16px;
  transition:border-color .24s}
.composer:focus-within{border-color:var(--line2)}
.composer-top{display:flex;gap:13px;align-items:flex-start}
.avatar{flex:0 0 auto;width:38px;height:38px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--serif);font-size:1rem;font-weight:600;letter-spacing:.02em;
  color:#080a14;
  background:linear-gradient(140deg,#e6dcb8,#c9b98a 55%,#94895e);
  box-shadow:0 0 0 1px rgba(201,185,138,.30)}
.avatar.ghost{background:transparent;color:var(--muted2);
  border:1px solid var(--line2);box-shadow:none}

.composer textarea{
  flex:1;min-height:76px;max-height:300px;resize:vertical;
  padding:11px 13px;border-radius:10px;
  border:1px solid var(--line2);background:rgba(5,7,16,.72);
  color:var(--text);font:inherit;font-size:.88rem;line-height:1.75;
  transition:border-color .24s,box-shadow .24s}
.composer textarea::placeholder{color:var(--muted2)}
.composer textarea:focus{outline:none;border-color:var(--gold);
  box-shadow:0 0 0 3px rgba(201,185,138,.13)}
.composer textarea:disabled{opacity:.5;cursor:not-allowed}

.composer-bar{display:flex;align-items:center;justify-content:space-between;
  gap:12px;margin-top:12px;padding-left:51px}
.count{color:var(--muted2);font-size:.66rem;letter-spacing:.12em}
.count.over{color:#e0807f}

/* 发帖区下面那行提示。全部用途都是「出错了 / 超长了」，
   所以直接给警示色，不用再分状态。 */
#composerNote{color:#e0807f;font-size:.7rem;line-height:1.7;letter-spacing:.04em;
  margin-top:10px;padding-left:51px}
@media(max-width:560px){#composerNote{padding-left:0}}

/* 视觉隐藏但读屏可见（表单 label 用） */
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

.btn-post{padding:10px 22px;border-radius:9px;cursor:pointer;
  border:1px solid var(--gold);background:rgba(201,185,138,.16);
  color:var(--gold-hi);font:inherit;font-size:.7rem;letter-spacing:.18em;
  text-transform:uppercase;transition:background .24s,opacity .24s}
.btn-post:hover:not(:disabled){background:rgba(201,185,138,.26)}
.btn-post:disabled{opacity:.42;cursor:not-allowed}

/* 未登录时的提示条（替掉发帖框） */
.signin-strip{display:flex;align-items:center;gap:14px;
  border:1px dashed var(--line2);border-radius:12px;
  background:rgba(14,15,30,.5);padding:16px 18px}
.signin-strip p{flex:1;color:var(--muted);font-size:.78rem;line-height:1.75;letter-spacing:.03em}
.signin-strip button{padding:10px 20px;border-radius:9px;cursor:pointer;
  border:1px solid var(--gold);background:rgba(201,185,138,.16);
  color:var(--gold-hi);font:inherit;font-size:.68rem;letter-spacing:.16em;
  text-transform:uppercase;white-space:nowrap;transition:background .24s}
.signin-strip button:hover{background:rgba(201,185,138,.26)}

/* ---------- 列表 ---------- */
.board-head{display:flex;align-items:baseline;justify-content:space-between;
  gap:12px;margin:44px 0 16px;padding-bottom:12px;
  border-bottom:1px solid var(--line)}
.board-head h2{font-family:var(--serif);font-weight:400;font-size:1.06rem;
  letter-spacing:.16em;text-transform:uppercase;color:var(--gold)}
.board-head span{color:var(--muted2);font-size:.66rem;letter-spacing:.14em}

.msg{display:flex;gap:13px;padding:17px 0;border-bottom:1px solid rgba(148,137,94,.10)}
.msg:last-of-type{border-bottom:0}
.msg-body{flex:1;min-width:0}
.msg-meta{display:flex;align-items:baseline;gap:9px;flex-wrap:wrap}
.msg-name{font-family:var(--serif);font-size:.94rem;letter-spacing:.05em;color:var(--gold-hi);
  word-break:break-all}
.msg-time{color:var(--muted2);font-size:.63rem;letter-spacing:.10em}
.msg-text{margin-top:8px;color:var(--text);font-size:.86rem;line-height:1.85;
  white-space:pre-wrap;word-break:break-word}
.msg-del{margin-left:auto;flex:0 0 auto;width:26px;height:26px;border-radius:50%;
  border:1px solid transparent;background:transparent;color:var(--muted2);
  font-size:.9rem;line-height:1;cursor:pointer;opacity:0;
  transition:opacity .2s,color .2s,border-color .2s}
.msg:hover .msg-del,.msg:focus-within .msg-del{opacity:1}
.msg-del:hover{color:#e0807f;border-color:rgba(224,128,127,.45)}
/* 触屏没有 hover，删除按钮直接显示 */
@media(hover:none){.msg-del{opacity:1}}

/* 空 / 错误状态 */
.state{text-align:center;padding:56px 20px;color:var(--muted2);
  font-size:.76rem;letter-spacing:.10em;line-height:2}
.state b{display:block;font-family:var(--serif);font-size:1.1rem;font-weight:400;
  letter-spacing:.16em;color:var(--gold);margin-bottom:10px}

.more-wrap{display:flex;justify-content:center;margin-top:26px}
.btn-more{padding:11px 24px;border-radius:9px;cursor:pointer;
  border:1px solid var(--line2);background:transparent;color:var(--gold);
  font:inherit;font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;
  transition:background .24s,border-color .24s,color .24s}
.btn-more:hover:not(:disabled){background:rgba(201,185,138,.12);
  border-color:var(--gold);color:var(--gold-hi)}
.btn-more:disabled{opacity:.45;cursor:not-allowed}

/* 底部返回 */
.back{display:flex;justify-content:center;margin-top:54px}
.back a{color:var(--muted);text-decoration:none;font-size:.7rem;letter-spacing:.16em;
  text-transform:uppercase;border-bottom:1px solid transparent;padding-bottom:3px;
  transition:color .24s,border-color .24s}
.back a:hover{color:var(--gold-hi);border-color:var(--gold)}

@media(max-width:560px){
  .composer-bar{padding-left:0}
  .signin-strip{flex-direction:column;align-items:stretch;text-align:center}
}