/* =========================================================
   READER.CSS – Khung trình đọc ebook (Đợt 1)
   Theme + Thanh công cụ + Cài đặt + tiện ích đọc
   ========================================================= */

/* ---------- Biến chỉnh văn bản (áp cho .article) ---------- */
:root{
  --rd-font-size:19px;
  --rd-line-height:1.55;
  --rd-reader-width:100%;
  --rd-font-body:var(--font-serif);
  --rd-text-align:justify;
  --rd-toolbar-h:54px;
}

/* ===================== THEME ===================== */
/* mặc định = sáng (giấy cũ + xanh rừng + vàng đồng) như style.css */

/* TỐI = nền slate + chủ đạo vàng đồng (xanh rừng sẽ chìm trên nền tối) */
body[data-theme="dark"]{
  --ink:#f5e8d1; --ink-soft:#cbbda7; --paper:#151f32; --paper-soft:#111a2b;
  --bg-1:#0f172a; --bg-2:#1a2438;
  --brand:#f0c66a; --brand-2:#d9ad55; --brand-soft:#25334a;
  --accent:#f3b548; --accent-2:#ffc867; --accent-soft:#26344b;
  --h1:#f0c66a; --h2:#ffce8a; --h3:#ffe0a3; --h4:#f3b548;
  --link:#7dd3fc; --border:rgba(255,232,190,.22); --border-2:rgba(255,232,190,.15);
  --highlight:#5a4a1e;
  --shadow:0 24px 60px rgba(0,0,0,.42); --shadow-sm:0 14px 32px rgba(0,0,0,.3);
}
body[data-theme="dark"] .sidebar{background:linear-gradient(180deg,rgba(11,20,34,.98),rgba(20,26,40,.98))}
body[data-theme="dark"] .article thead th,
body[data-theme="dark"] .article tr:first-child th{color:#101726}
body[data-theme="dark"] .article img{border-color:rgba(255,232,190,.18)}
body[data-theme="dark"] .toc a{color:#e7ddc8}
body[data-theme="dark"] .toc a:hover{background:rgba(243,181,72,.14)}
body[data-theme="dark"] .nav-link{background:#1a2438}

/* SEPIA = giấy ngà ấm, vẫn xanh rừng + vàng đồng */
body[data-theme="sepia"]{
  --ink:#3a2a1a; --ink-soft:#6f5b45; --paper:#fff8ea; --paper-soft:#f7ecd5;
  --bg-1:#f3e3c3; --bg-2:#f5e9d0;
  --brand:#1e3a2f; --brand-2:#15291f; --brand-soft:#e7ddc2;
  --accent:#c8860f; --accent-2:#a4570f; --accent-soft:#f2e2c0;
  --h1:#1e3a2f; --h2:#a4570f; --h3:#2f5d4d; --h4:#7c4a12;
  --border:#d8c7a3; --border-2:#e6d6b4;
}

/* PAPER = giấy thô vàng hơn */
body[data-theme="paper"]{
  --ink:#382719; --ink-soft:#5e4a34; --paper:#fffaf0; --paper-soft:#f4e4c5;
  --bg-1:#efe0bf; --bg-2:#f1e3c2;
  --brand:#1e3a2f; --brand-2:#15291f; --brand-soft:#e3dabd;
  --accent:#c8860f; --accent-2:#a4570f; --accent-soft:#ecdcb6;
  --h1:#1e3a2f; --h2:#9a5b13; --h3:#2f5d4d; --h4:#7c4a12;
  --border:#d3bf95; --border-2:#e0cda3;
}

/* ---------- áp biến văn bản ---------- */
.article{font-family:var(--rd-font-body)}
.article p,.article li{font-size:var(--rd-font-size)}
.article p{line-height:var(--rd-line-height);text-align:var(--rd-text-align)}
.content{max-width:var(--rd-reader-width);margin-inline:auto;width:100%}
body.rd-hide-images .article img{display:none}
.article.rd-twocol{column-count:2;column-gap:40px}
@media(max-width:980px){.article.rd-twocol{column-count:1}}

/* ===================== KHUNG APP ===================== */
body.rd-on{padding-top:var(--rd-toolbar-h)}
/* đẩy sidebar dính xuống dưới thanh công cụ */
body.rd-on .sidebar{top:calc(var(--rd-toolbar-h) + 14px);max-height:calc(100vh - var(--rd-toolbar-h) - 28px)}

/* progress bar trên cùng */
.rd-progress{position:fixed;top:0;left:0;right:0;height:4px;background:transparent;z-index:60;pointer-events:none}
.rd-progress__fill{height:100%;width:0;background:linear-gradient(90deg,var(--brand),var(--accent));transition:width .1s linear}

/* thanh công cụ */
.rd-toolbar{
  position:fixed;top:0;left:0;right:0;height:var(--rd-toolbar-h);z-index:55;
  display:flex;align-items:center;gap:8px;padding:0 12px;
  background:linear-gradient(180deg,var(--brand) 0%,var(--brand-2) 100%);
  color:#fff;box-shadow:var(--shadow-sm);font-family:var(--font-sans);
}
.rd-toolbar__group{display:flex;align-items:center;gap:4px}
.rd-toolbar__center{flex:1;min-width:0;text-align:center;line-height:1.15}
.rd-toolbar__title{font-weight:800;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rd-toolbar__sub{font-size:11px;opacity:.85;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rd-btn{
  appearance:none;border:0;background:rgba(255,255,255,.12);color:#fff;cursor:pointer;
  width:38px;height:38px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;
  font-size:18px;line-height:1;transition:background .15s,transform .1s;
}
.rd-btn:hover{background:rgba(255,255,255,.24)}
.rd-btn:active{transform:scale(.94)}
.rd-btn.is-active{background:var(--accent);color:#1a1a1a}
.rd-btn svg{width:20px;height:20px;stroke:currentColor;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}

/* nút cuộn lên đầu */
.rd-totop{
  position:fixed;right:18px;bottom:80px;z-index:50;width:46px;height:46px;border-radius:50%;
  border:0;cursor:pointer;background:var(--brand);color:#fff;box-shadow:var(--shadow);
  display:flex;align-items:center;justify-content:center;font-size:20px;
  opacity:0;visibility:hidden;transform:translateY(10px);transition:.2s;
}
.rd-totop.show{opacity:1;visibility:visible;transform:none}
.rd-totop svg{width:22px;height:22px;stroke:#fff;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}

/* chip thời gian đọc */
.rd-readtime{
  position:fixed;left:18px;bottom:18px;z-index:48;
  background:var(--paper);color:var(--ink-soft);border:1px solid var(--border);
  border-radius:999px;padding:6px 14px;font-size:13px;font-family:var(--font-sans);
  box-shadow:var(--shadow-sm);max-width:70vw;
}
.rd-readtime b{color:var(--brand)}

/* ===================== MODAL / SHEET ===================== */
.rd-overlay{position:fixed;inset:0;background:rgba(15,30,22,.45);z-index:70;opacity:0;visibility:hidden;transition:.2s}
.rd-overlay.show{opacity:1;visibility:visible}
.rd-modal{
  position:fixed;z-index:75;background:var(--paper);color:var(--ink);
  box-shadow:var(--shadow);font-family:var(--font-sans);
}
/* dạng cửa sổ giữa (desktop) */
.rd-modal.rd-dialog{
  top:50%;left:50%;transform:translate(-50%,-46%);width:min(560px,92vw);max-height:86vh;
  border-radius:18px;display:flex;flex-direction:column;overflow:hidden;
  opacity:0;visibility:hidden;transition:.2s;
}
.rd-modal.rd-dialog.show{transform:translate(-50%,-50%);opacity:1;visibility:visible}
.rd-modal__head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:16px 18px;border-bottom:1px solid var(--border)}
.rd-modal__head h3{margin:0;font-size:18px;color:var(--brand)}
.rd-modal__body{padding:8px 18px 18px;overflow:auto}
.rd-x{appearance:none;border:0;background:transparent;font-size:22px;cursor:pointer;color:var(--ink-soft);width:34px;height:34px;border-radius:8px}
.rd-x:hover{background:var(--bg-2)}

/* tabs cài đặt */
.rd-tabs{display:flex;flex-wrap:wrap;gap:6px;padding:12px 0 4px;position:sticky;top:0;background:var(--paper)}
.rd-tab{border:1px solid var(--border);background:transparent;color:var(--ink-soft);border-radius:999px;padding:6px 12px;font-size:13px;cursor:pointer}
.rd-tab.is-active{background:var(--brand);color:#fff;border-color:var(--brand)}
.rd-pane{display:none;padding-top:10px}
.rd-pane.is-active{display:block}

/* hàng cài đặt */
.rd-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 0;border-bottom:1px dashed var(--border)}
.rd-row:last-child{border-bottom:0}
.rd-row__label{font-size:14px}
.rd-row__label small{display:block;color:var(--ink-soft);font-size:12px;font-weight:400}
.rd-seg{display:inline-flex;flex-wrap:wrap;gap:4px}
.rd-seg button{border:1px solid var(--border);background:transparent;color:var(--ink);border-radius:8px;padding:6px 10px;font-size:13px;cursor:pointer}
.rd-seg button.is-active{background:var(--brand);color:#fff;border-color:var(--brand)}
.rd-step{display:inline-flex;align-items:center;gap:8px}
.rd-step button{width:32px;height:32px;border-radius:8px;border:1px solid var(--border);background:transparent;color:var(--ink);font-size:17px;cursor:pointer}
.rd-step span{min-width:54px;text-align:center;font-size:14px}
.rd-switch{position:relative;width:44px;height:26px;flex:0 0 auto}
.rd-switch input{opacity:0;width:0;height:0}
.rd-switch span{position:absolute;inset:0;background:var(--border);border-radius:999px;transition:.2s;cursor:pointer}
.rd-switch span::before{content:"";position:absolute;width:20px;height:20px;left:3px;top:3px;background:#fff;border-radius:50%;transition:.2s}
.rd-switch input:checked + span{background:var(--brand)}
.rd-switch input:checked + span::before{transform:translateX(18px)}
.rd-range{width:150px}
.rd-theme-dots{display:flex;gap:8px}
.rd-theme-dots button{width:30px;height:30px;border-radius:50%;border:2px solid var(--border);cursor:pointer}
.rd-theme-dots button.is-active{border-color:var(--brand);box-shadow:0 0 0 2px var(--brand)}
.rd-reset{margin-top:14px;width:100%;padding:10px;border-radius:10px;border:1px solid var(--border);background:transparent;color:var(--ink);cursor:pointer;font-size:14px}
.rd-reset:hover{background:var(--bg-2)}
/* nút nhỏ + select + slider */
.rd-mini-btn{border:1px solid var(--border);background:transparent;color:var(--ink);border-radius:8px;padding:6px 12px;font-size:13px;cursor:pointer;display:inline-flex;align-items:center}
.rd-mini-btn:hover{background:var(--bg-2)}
.rd-select{border:1px solid var(--border);background:var(--paper);color:var(--ink);border-radius:8px;padding:7px 10px;font-size:14px;min-width:170px;cursor:pointer}
.rd-slider{-webkit-appearance:none;appearance:none;height:6px;border-radius:999px;background:linear-gradient(90deg,var(--brand),var(--accent));outline:none;cursor:pointer}
.rd-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:18px;height:18px;border-radius:50%;background:#fff;border:2px solid var(--brand);box-shadow:var(--shadow-sm);cursor:pointer}
.rd-slider::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:#fff;border:2px solid var(--brand);cursor:pointer}
.rd-row__label b{color:var(--brand);font-weight:700}
/* khi có ảnh nền: làm khung đọc đục nhẹ cho dễ nhìn */
body.rd-has-bg .article{backdrop-filter:saturate(1.05)}
body.rd-has-bg .page-shell{background:rgba(0,0,0,.04)}
/* form tài khoản */
.rd-field{margin:10px 0}
.rd-field label{display:block;font-size:13px;color:var(--ink-soft);margin-bottom:4px}
.rd-input{width:100%;border:1px solid var(--border);background:var(--paper);color:var(--ink);border-radius:9px;padding:9px 11px;font-size:14px;font-family:var(--font-sans)}
.rd-input:focus{outline:2px solid var(--brand-soft);border-color:var(--brand)}
textarea.rd-input{resize:vertical}
.rd-err{color:#c2410c;font-size:13px;min-height:18px;margin:4px 0}

/* auto-scroll mini control */
.rd-autoscroll{display:flex;align-items:center;gap:8px}

/* ===================== FOCUS MODE ===================== */
body.rd-focus .rd-toolbar,
body.rd-focus .sidebar,
body.rd-focus .bottom-nav,
body.rd-focus .rd-readtime{opacity:.12;transition:opacity .3s}
body.rd-focus .rd-toolbar:hover,
body.rd-focus .sidebar:hover{opacity:1}

/* ===================== TOAST ===================== */
.rd-toast{
  position:fixed;left:50%;bottom:84px;transform:translateX(-50%) translateY(20px);z-index:80;
  background:var(--paper);color:var(--ink);border:1px solid var(--border);border-left:4px solid var(--brand);
  border-radius:12px;padding:12px 16px;box-shadow:var(--shadow);font-family:var(--font-sans);font-size:14px;
  max-width:min(420px,92vw);opacity:0;visibility:hidden;transition:.25s;
}
.rd-toast.show{opacity:1;visibility:visible;transform:translateX(-50%)}
.rd-toast__row{display:flex;gap:10px;align-items:center;margin-top:8px;justify-content:flex-end}
.rd-toast button{border-radius:8px;padding:6px 12px;font-size:13px;cursor:pointer;border:1px solid var(--border);background:transparent;color:var(--ink)}
.rd-toast button.primary{background:var(--brand);color:#fff;border-color:var(--brand)}

/* ===================== MOBILE BOTTOM NAV ===================== */
.rd-bottomnav{display:none}
@media(max-width:820px){
  .rd-bottomnav{
    display:flex;position:fixed;left:0;right:0;bottom:0;z-index:56;height:60px;
    background:var(--paper);border-top:1px solid var(--border);box-shadow:0 -6px 20px rgba(0,0,0,.08);
    font-family:var(--font-sans);
  }
  .rd-bottomnav button{
    flex:1;border:0;background:transparent;color:var(--ink-soft);cursor:pointer;
    display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;font-size:11px;
  }
  .rd-bottomnav button svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
  .rd-bottomnav button.is-active{color:var(--brand)}
  body.rd-on{padding-bottom:60px}
  .rd-totop{bottom:74px}
  .rd-readtime{bottom:70px;font-size:12px;padding:5px 10px}
  /* trên mobile: ẩn sidebar mặc định, mở bằng nút Mục lục */
  .sidebar{display:none}
  body.rd-show-toc .sidebar{display:block}
  /* gom thanh công cụ: ẩn các nút công cụ trên toolbar mobile (đã có ở thanh dưới / Sổ tay) */
  .rd-toolbar .rd-btn.rd-extra{display:none}
}

/* ===================== CỔNG ĐĂNG NHẬP (khóa trang đọc) ===================== */
.rd-lock{
  position:fixed;inset:0;z-index:65;display:flex;align-items:center;justify-content:center;padding:20px;
  background:rgba(20,30,22,.5);backdrop-filter:blur(7px);-webkit-backdrop-filter:blur(7px);
}
.rd-lock__card{
  max-width:380px;width:100%;text-align:center;font-family:var(--font-sans);
  background:var(--paper);color:var(--ink);border:1px solid var(--border);border-radius:20px;
  box-shadow:var(--shadow);padding:32px 26px;
}
.rd-lock__ic{font-size:42px;line-height:1}
.rd-lock__card h2{margin:12px 0 6px;color:var(--brand);font-size:21px}
.rd-lock__card p{margin:0 0 20px;color:var(--ink-soft);font-size:14px;line-height:1.6}
.rd-lock__btns{display:flex;flex-direction:column;gap:9px}
.rd-lock-btn{padding:12px;border-radius:11px;font-size:14px;font-weight:800;cursor:pointer;border:1px solid var(--border);background:transparent;color:var(--brand);font-family:var(--font-sans);transition:transform .12s,background .15s}
.rd-lock-btn:hover{transform:translateY(-1px)}
.rd-lock-btn.primary{background:var(--brand);color:#fff8e7;border-color:var(--brand)}
.rd-lock-btn.primary:hover{background:var(--brand-2)}
.rd-lock__home{display:inline-block;margin-top:16px;font-size:13px;color:var(--ink-soft);text-decoration:none}
.rd-lock__home:hover{color:var(--brand)}
body.rd-locked{overflow:hidden}

/* tiện ích chung */
.rd-hidden{display:none!important}
@media print{.rd-toolbar,.rd-progress,.rd-totop,.rd-readtime,.rd-bottomnav,.rd-overlay,.rd-modal{display:none!important}}