:root{
  --sea:#0f4c5c;--sea-2:#1c6474;--beam:#ffd666;--beam-soft:#fff5d6;--coral:#e07a3f;--paper:#f3f1ea;--card:#fff;
  --ink:#24303a;--muted:#66707a;--line:#e2ddd1;--warn:#c8465a;--r:16px;
  --chi:#c8465a;--math:#2f6fb5;--sci:#2e8b57;--soc:#b7791f;--extra:#8a8f98
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;min-height:100vh;background:var(--paper);color:var(--ink);font-family:"M PLUS Rounded 1c","PingFang TC","Microsoft JhengHei",sans-serif;
  padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}
body.noscroll{overflow:hidden}
a{color:inherit;text-decoration:none}
button,input{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:3px solid var(--beam);outline-offset:2px}
.hidden{display:none!important}
.view{width:min(100%,980px);margin:0 auto;padding:10px 14px 60px}
.muted{color:var(--muted);font-size:13px}
.warn{background:#fdecef;color:var(--warn);border-radius:10px;padding:8px 12px;font-size:14px}
.empty{color:var(--muted);text-align:center;padding:40px 0}
.ver{color:#aaa;font-size:11px;text-align:center;margin-top:22px}

/* 頂部 */
.top{position:sticky;top:6px;z-index:5;display:flex;align-items:center;gap:10px;background:var(--sea);color:#fff;border-radius:var(--r);padding:8px 10px;box-shadow:0 10px 24px -16px rgba(15,76,92,.8)}
.back{width:40px;height:40px;border-radius:50%;background:rgba(255,255,255,.14);display:grid;place-items:center;font-size:28px;line-height:1;flex:none}
.lamp{width:40px;height:40px;flex:none;border-radius:50%;background:radial-gradient(circle at 50% 50%,var(--beam) 0 30%,rgba(255,214,102,.25) 31% 60%,transparent 61%)}
.top-title{flex:1;display:grid;min-width:0}
.top-title strong{font-size:18px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.top-title small{font-size:12px;opacity:.8;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.top-btn{border:0;background:rgba(255,255,255,.14);color:#fff;border-radius:999px;padding:7px 12px;font-size:13px;flex:none}

/* 登入 */
.login{max-width:380px;margin:9vh auto 0;display:grid;gap:12px;text-align:center}
.login-logo{width:110px;height:110px;margin:0 auto;border-radius:26px;box-shadow:0 14px 30px -18px rgba(15,76,92,.9)}
.login h1{margin:0;font-size:28px;letter-spacing:.08em}
.login p{margin:0}
.login .sub{color:var(--muted)}
.login form{display:grid;gap:10px;margin-top:6px}
.login input{width:100%;padding:13px;border:2px solid var(--line);border-radius:12px;background:#fff;font-size:17px;text-align:center}
.btn{display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:999px;padding:11px 18px;font-weight:800;background:#e8e3d6;white-space:nowrap}
.btn.primary{background:var(--sea);color:#fff}
.btn:disabled{opacity:.6}

/* 科目 */
.subjects{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px;margin-top:16px}
.subject{--c:var(--sea);background:var(--card);border-radius:var(--r);padding:18px 18px 16px;display:grid;gap:4px;border-left:8px solid var(--c);box-shadow:0 1px 0 var(--line),0 14px 26px -22px rgba(15,76,92,.6)}
.subject strong{font-size:24px;color:var(--c)}
.subject small{color:var(--muted);font-size:13px}
.subject .books-line{font-size:12px;color:var(--ink);opacity:.75;margin-top:4px}
.s-chi{--c:var(--chi)}.s-math{--c:var(--math)}.s-sci{--c:var(--sci)}.s-soc{--c:var(--soc)}
.subject.extra{--c:var(--extra);background:transparent;box-shadow:inset 0 0 0 1px var(--line)}
.subject.extra strong{font-size:18px}

/* 單元 */
.group{font-size:14px;color:var(--sea);margin:18px 2px 0;grid-column:1/-1;letter-spacing:.05em}
.units{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:10px;margin-top:14px}
.unit{display:flex;align-items:center;gap:12px;background:var(--card);border-radius:var(--r);padding:12px;box-shadow:0 1px 0 var(--line)}
.unit-no{flex:none;width:46px;height:46px;border-radius:50%;background:var(--sea);color:var(--beam);display:grid;place-items:center;font-weight:800;font-size:20px}
.unit.tagged .unit-no{font-size:15px}
.unit.review .unit-no{background:var(--beam);color:var(--sea);font-size:17px}
.unit-body{display:grid;gap:3px;min-width:0}
.unit-body strong{font-size:16px}
.unit-body small{color:var(--muted);font-size:12px}

/* 本子分頁 */
.books{display:flex;gap:6px;overflow-x:auto;margin:12px -2px 6px;padding:2px;scrollbar-width:none}
.books::-webkit-scrollbar{display:none}
.book{flex:none;padding:9px 14px;border-radius:999px;background:var(--card);font-weight:800;font-size:14px;box-shadow:inset 0 0 0 1px var(--line)}
.book.active{background:var(--beam);box-shadow:none;color:var(--sea)}
.book.none{color:#b9b3a6;background:transparent;font-weight:400}
.sections{display:flex;flex-wrap:wrap;gap:6px;margin:6px 0}
.chip{border:0;background:var(--beam-soft);border-radius:999px;padding:5px 10px;font-size:12px;font-weight:700;color:var(--sea)}
.count{margin:8px 2px;font-size:14px;font-weight:700}
.pages{display:grid;gap:14px}
.page{margin:0;background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 1px 0 var(--line),0 12px 24px -22px rgba(15,76,92,.6)}
.page figcaption{font-size:12px;color:var(--muted);padding:6px 10px;border-bottom:1px solid var(--line)}
.page img{display:block;width:100%;height:auto;min-height:200px;cursor:zoom-in;background:#faf8f3}
.unit-nav{display:flex;justify-content:space-between;gap:8px;margin-top:18px}
.unit-nav .btn{padding:11px 14px;font-size:14px}

/* 放大 */
.zoom{position:fixed;inset:0;z-index:30;background:rgba(10,26,32,.95)}
.zoom-scroll{position:absolute;inset:0;overflow:auto;-webkit-overflow-scrolling:touch}
.zoom-scroll img{display:block;width:200%;max-width:none;height:auto}
@media(min-width:900px){.zoom-scroll img{width:150%}}
.zoom-close{position:fixed;right:14px;top:calc(14px + env(safe-area-inset-top));z-index:31;width:46px;height:46px;border-radius:50%;border:0;background:#fff;font-size:28px;line-height:1}

.toast{position:fixed;left:50%;bottom:calc(22px + env(safe-area-inset-bottom));transform:translateX(-50%);background:var(--sea);color:#fff;padding:10px 16px;border-radius:999px;z-index:40;font-size:14px}
.toast.error{background:var(--warn)}
@media(max-width:520px){.subjects{grid-template-columns:1fr 1fr;gap:10px}.subject{padding:14px}.subject strong{font-size:21px}.units{grid-template-columns:1fr}}
.oldwarn{background:#fdecef;color:var(--warn);font-size:14px;padding:10px 14px;text-align:center;font-weight:700}