/* 经典古籍·山海经阅读器 — 宣纸主题
   页面：宣纸 #ECE5D3；书卡/书函：深海蓝 #0B1A2C；描金：古铜 #C4B99A */
:root{
  --bg:#F5F2E9;
  --bg-2:#FBF8F0;
  --panel:#F8F6F0;
  --ink:#1B1A17;
  --ink-soft:#5A5852;
  --copper:#D0B480;
  --copper-deep:#B89B68;
  --copper-bright:#E8DCC0;            /* 仅用于蓝书上的描金 */
  --line:rgba(27,26,23,.14);
  --book-1:#16273c;                   /* 深蓝书函 */
  --book-2:#0d1a2b;
  --book-spine:#D0B480;
  --blue:#2C6E8F;
  --blue-soft:#97AAAE;
  --shadow:0 16px 40px -30px rgba(27,26,23,.5);
  --serif:"Noto Serif SC","Songti SC","SimSun",serif;
  --latin:"Cormorant Garamond","Noto Serif SC",serif;
  --brush:"Ma Shan Zheng","Noto Serif SC",serif;
}
*{box-sizing:border-box;margin:0;padding:0}
a{color:inherit;text-decoration:none}
html{scroll-behavior:smooth}
body{
  font-family:var(--serif);font-weight:400;line-height:1.9;
  color:var(--ink);background:var(--bg);
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  background-image:
    radial-gradient(circle at 18% 12%,rgba(208,180,128,.08),transparent 42%),
    radial-gradient(circle at 82% 88%,rgba(151,170,174,.07),transparent 46%);
  min-height:100vh;
}
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background-image:repeating-linear-gradient(90deg,rgba(27,26,23,.018) 0 1px,transparent 1px 3px);
  mix-blend-mode:multiply}
.nav,.footer,#app{position:relative;z-index:1}

/* ---------- 顶栏（宣纸，干净无杂色） ---------- */
.nav{position:sticky;top:0;z-index:30;background:rgba(245,242,233,.92);
  backdrop-filter:saturate(140%) blur(6px)}
.nav-inner{max-width:1080px;margin:0 auto;padding:16px 28px;
  display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:14px}
.logo-xuan{width:46px;height:46px;flex-shrink:0;object-fit:contain;background:transparent}
.brand-text{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap;justify-content:center}
.brand-text .cn{font-family:var(--serif);font-size:1.05rem;letter-spacing:.12em;font-weight:700;line-height:1.2;color:var(--ink)}
.brand-text .en{font-family:var(--latin);font-size:.68rem;letter-spacing:.22em;
  color:var(--blue-soft);line-height:1.1;text-transform:uppercase}
.menu{display:flex;gap:28px;flex-wrap:wrap;align-items:center}
.menu a{color:var(--ink);font-size:.92rem;letter-spacing:.12em;padding-bottom:4px;
  border-bottom:1px solid transparent;transition:.25s;text-decoration:none}
.menu a:hover{color:var(--blue);border-color:var(--blue)}
.menu a.active{color:var(--blue);border-color:var(--blue)}

/* 其余古籍下拉 */
.dropdown{position:relative;display:flex;align-items:center}
.dropdown-menu{position:absolute;top:calc(100% + 10px);left:0;min-width:160px;
  background:var(--bg-2);border:1px solid var(--copper);border-radius:8px;
  box-shadow:0 18px 46px -26px rgba(27,26,23,.6);padding:.45rem 0;
  display:none;flex-direction:column;z-index:40}
.dropdown:hover .dropdown-menu,.dropdown:focus-within .dropdown-menu{display:flex}
.dropdown-menu .dd-head{padding:.4rem 1.2rem;font-size:.74rem;letter-spacing:.14em;
  color:var(--ink-soft);opacity:.7}
.dropdown-menu a{padding:.55rem 1.2rem;font-size:.9rem;color:var(--ink);
  letter-spacing:.1em;white-space:nowrap;transition:.2s;border:none;text-decoration:none}
.dropdown-menu a:hover{background:rgba(44,110,143,.1);color:var(--blue)}
.dropdown-menu .more{padding:.35rem 1.2rem;font-size:.76rem;color:var(--ink-soft);opacity:.7}

/* 登录/注册区 */
.auth{display:flex;gap:8px;align-items:center}
.auth button{font-family:inherit;font-size:.85rem;padding:5px 14px;
  border:1px solid var(--copper);background:transparent;color:var(--copper-deep);
  border-radius:4px;cursor:pointer;transition:.2s;letter-spacing:.1em}
.auth button:hover{background:var(--copper);color:var(--bg-2)}
.auth .user{color:var(--ink);font-size:.9rem;letter-spacing:.06em}

/* ---------- 主体 ---------- */
main{max-width:960px;margin:0 auto;padding:34px 22px 60px}
.col-head{text-align:center;margin-bottom:28px}
.col-head h1{font-size:clamp(28px,4.4vw,38px);letter-spacing:.3em;margin:0 0 8px;
  color:var(--ink);font-family:var(--brush);font-weight:400;padding-left:.4em}
.col-sub{color:var(--ink-soft);margin:0;font-size:.92rem;letter-spacing:.06em}
.col-hint{text-align:center;color:var(--copper-deep);font-size:.82rem;margin:14px 0 30px;letter-spacing:.04em}

/* 卷目网格（深蓝旧书函质感，书保持深蓝） */
.vol-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:18px}
.vol-card{position:relative;display:flex;flex-direction:column;gap:6px;
  padding:20px 18px 20px 30px;text-decoration:none;color:var(--ink);
  background:linear-gradient(160deg,var(--book-1),var(--book-2) 72%);
  border:1px solid rgba(232,220,192,.22);border-left:9px solid var(--book-spine);
  border-radius:3px 9px 9px 3px;
  box-shadow:3px 0 0 #0e2236,6px 0 0 #102539,9px 0 0 #122a3d,0 14px 34px -28px rgba(27,26,23,.5);
  transition:.22s;overflow:hidden}
.vol-card::before{content:"";position:absolute;right:7px;top:12px;bottom:12px;width:3px;
  background:repeating-linear-gradient(to bottom,rgba(232,220,192,.22) 0 1px,transparent 1px 4px)}
.vol-card::after{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(circle at 0 0,rgba(0,0,0,.28),transparent 32%),
            radial-gradient(circle at 100% 100%,rgba(0,0,0,.22),transparent 32%)}
.vol-card:hover{border-left-color:var(--copper);background:linear-gradient(160deg,#1f3a55,#122a3d 72%);
  transform:translateY(-5px);
  box-shadow:3px 0 0 #0e2236,6px 0 0 #102539,9px 0 0 #122a3d,var(--shadow)}
.vol-no{font-size:.8rem;color:var(--copper);letter-spacing:.22em;font-family:var(--latin)}
.vol-title{font-size:1.25rem;font-weight:600;letter-spacing:.08em;color:var(--copper-bright)}
.vol-meta{font-size:.74rem;color:rgba(232,220,192,.72);letter-spacing:.06em}

/* 阅读视图 */
.read-head{display:flex;flex-direction:column;gap:12px;margin-bottom:20px}
.back{color:var(--copper-deep);text-decoration:none;font-size:.88rem;letter-spacing:.06em}
.back:hover{color:var(--blue)}
.read-title{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.read-title h1{font-size:clamp(24px,3.8vw,30px);letter-spacing:.24em;margin:0;color:var(--ink);font-family:var(--brush);font-weight:400;padding-left:.3em}
.badge{font-size:.74rem;padding:3px 11px;border-radius:20px;letter-spacing:.08em}
.badge.member{background:var(--copper);color:var(--bg-2)}
.badge.guest{background:rgba(208,180,128,.12);color:var(--copper-deep);border:1px solid var(--copper)}
.read-tools{display:flex;gap:8px;flex-wrap:wrap}
.read-tools button{font-family:inherit;font-size:.88rem;padding:7px 18px;
  border:1px solid var(--copper);background:transparent;color:var(--copper-deep);
  border-radius:4px;cursor:pointer;letter-spacing:.08em;transition:.2s}
.read-tools button:hover{background:var(--copper);color:var(--bg-2)}
.intro{color:var(--ink-soft);font-size:.84rem;border-left:3px solid var(--copper);
  padding-left:12px;margin-bottom:20px;letter-spacing:.02em}
.content{font-size:1.06rem;line-height:2.05}
.content p{margin:0 0 16px;text-align:justify;text-indent:2em;color:var(--ink)}
.content p:first-child{text-indent:0}

/* 游客门禁 */
.lock{margin-top:26px;padding:26px;text-align:center;
  border:1px dashed var(--copper);border-radius:10px;background:rgba(208,180,128,.08)}
.lock p{margin:4px 0;color:var(--ink-soft);font-size:.92rem}
.lock-tip{color:var(--copper-deep)!important;font-weight:600}
.lock button{margin-top:14px;font-family:inherit;font-size:.95rem;padding:9px 24px;
  border:none;background:var(--copper);color:var(--bg-2);border-radius:5px;cursor:pointer;letter-spacing:.08em}
.lock button:hover{background:var(--copper-deep)}

/* ---------- 页脚 ---------- */
.footer{text-align:center;color:var(--ink-soft);font-size:.78rem;
  padding:26px 1.5rem 34px;border-top:1px solid var(--blue-soft);background:rgba(151,170,174,.08);letter-spacing:.04em;line-height:1.9}
.footer .small{opacity:.8;margin-top:.3rem}

/* ---------- 弹窗（登录/注册） ---------- */
.modal-mask{position:fixed;inset:0;background:rgba(27,26,23,.5);
  display:flex;align-items:center;justify-content:center;z-index:60}
.modal-mask[hidden]{display:none}
.modal{background:var(--panel);width:340px;max-width:90vw;border-radius:12px;
  padding:26px 24px;position:relative;border:1px solid var(--copper);
  box-shadow:var(--shadow)}
.modal-close{position:absolute;top:8px;right:12px;border:none;background:none;
  font-size:22px;color:var(--ink-soft);cursor:pointer;line-height:1}
.modal h2{margin:0 0 16px;font-size:1.2rem;letter-spacing:.18em;color:var(--copper-deep)}
.modal input{width:100%;font-family:inherit;font-size:1rem;color:var(--ink);
  padding:9px 12px;margin-bottom:12px;border:1px solid var(--line);border-radius:5px;
  background:var(--bg-2)}
.modal input::placeholder{color:#9a9486}
.modal button[type=submit]{width:100%;font-family:inherit;font-size:1rem;padding:10px;
  border:none;background:var(--copper);color:var(--bg-2);border-radius:5px;cursor:pointer;letter-spacing:.1em}
.modal button[type=submit]:hover{background:var(--copper-deep)}
.modal .msg{color:#b5503f;font-size:.82rem;min-height:18px;margin:6px 0 0}
.modal .switch{font-size:.82rem;color:var(--ink-soft);text-align:center;margin-top:4px}
.modal .switch a{color:var(--copper-deep)}

/* ---------- 弹窗补充：验证码 / 记住我 / 会员中心 ---------- */
.modal .cap{display:flex;align-items:center;gap:8px;margin-bottom:12px}
.modal .cap #capQ{flex:none;min-width:78px;text-align:center;
  font-family:var(--latin);font-size:1.05rem;letter-spacing:.06em;color:var(--ink);
  background:rgba(208,180,128,.16);padding:7px 10px;border-radius:5px}
.modal .cap input{flex:1;min-width:0;margin-bottom:0}
.modal .cap .mini{flex:none;width:auto;padding:7px 10px;margin-bottom:0;
  font-family:inherit;font-size:.78rem;letter-spacing:.04em;white-space:nowrap;
  border:1px solid var(--line);background:var(--bg-2);color:var(--ink-soft);
  border-radius:5px;cursor:pointer}
.modal .cap .mini:hover{border-color:var(--copper);color:var(--copper-deep)}

.modal .ck{display:flex;align-items:center;gap:7px;margin:-2px 0 12px;
  font-size:.82rem;color:var(--ink-soft);cursor:pointer;user-select:none}
.modal .ck input{width:auto;margin:0;cursor:pointer}

.modal .msg.good{color:#3E7A5E}

.modal .uc{margin-bottom:14px;padding:12px 14px;border-radius:6px;
  background:rgba(151,170,174,.1);font-size:.86rem}
.modal .uc p{display:flex;justify-content:space-between;gap:1rem;margin:3px 0;color:var(--ink-soft)}
.modal .uc b{color:var(--ink);font-weight:600}

@media(max-width:640px){
  .menu{gap:1rem}
  .brand-text .en{font-size:.6rem}
  main{padding:26px 18px 48px}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important}html{scroll-behavior:auto}}