/* ==========================================================
   汉语学习 · Chinese Flashcards — stylesheet
   Palette taken from the course artwork: cream, deep red, gold, ink
   ========================================================== */

:root{
  --cream:#fbf3e3;
  --cream-2:#f6ead2;
  --paper:#fffdf7;
  --red:#8c1d2c;
  --red-dark:#6d1421;
  --gold:#c9a227;
  --gold-soft:#e0c469;
  --ink:#2e3a59;
  --text:#3a2c22;
  --muted:#8a7862;
  --line:rgba(140,29,44,.16);
  --ok:#2f7d4f;
  --warn:#b4661b;
  --shadow:0 10px 30px rgba(80,50,20,.13);
  --shadow-sm:0 4px 14px rgba(80,50,20,.10);
  --radius:18px;
  --font-cn:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB",
            "Microsoft YaHei","Heiti SC",sans-serif;
  --font-ar:"Noto Naskh Arabic","Amiri","Traditional Arabic","Segoe UI","Geeza Pro",
            "Times New Roman",serif;
  --font:"Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
}

html[data-theme="dark"]{
  --cream:#1c1613;
  --cream-2:#241c17;
  --paper:#251d18;
  --red:#e0707f;
  --red-dark:#c05261;
  --gold:#e0c469;
  --gold-soft:#c9a227;
  --ink:#cfd7ee;
  --text:#f0e6d8;
  --muted:#b7a795;
  --line:rgba(224,196,105,.22);
  --shadow:0 10px 30px rgba(0,0,0,.45);
  --shadow-sm:0 4px 14px rgba(0,0,0,.35);
}

*{box-sizing:border-box}

html{scroll-behavior:smooth}

body{
  margin:0;
  font-family:var(--font);
  color:var(--text);
  background:
    radial-gradient(1200px 600px at 10% -5%, rgba(201,162,39,.16), transparent 60%),
    radial-gradient(900px 500px at 100% 0%, rgba(140,29,44,.12), transparent 55%),
    var(--cream);
  min-height:100vh;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

.ar, [dir="rtl"]{font-family:var(--font-ar); }
.cn, [lang="zh-Hans"]{font-family:var(--font-cn); }

img{max-width:100%;display:block}

/* --------- decorative clouds --------- */
.page-deco{position:fixed;inset:0;pointer-events:none;z-index:0;overflow:hidden}
.cloud{
  position:absolute;width:280px;height:120px;border-radius:60px;
  border:2px solid var(--line);
  background:radial-gradient(closest-side, rgba(201,162,39,.10), transparent 75%);
  filter:blur(.3px);opacity:.7;
}
.cloud::before,.cloud::after{
  content:"";position:absolute;border-radius:50%;border:2px solid var(--line);
  background:transparent;
}
.cloud::before{width:110px;height:110px;left:34px;top:-58px}
.cloud::after{width:80px;height:80px;right:44px;top:-40px}
.c1{top:12%;left:-90px}
.c2{top:52%;right:-100px;transform:scale(1.2)}
.c3{bottom:6%;left:12%;transform:scale(.85)}

/* --------- shell --------- */
.site-header{
  position:relative;z-index:2;
  display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between;
  padding:18px clamp(14px,4vw,44px);
  border-bottom:1px solid var(--line);
  background:linear-gradient(180deg, rgba(255,253,247,.92), rgba(255,253,247,.55));
  backdrop-filter:blur(6px);
}
html[data-theme="dark"] .site-header{
  background:linear-gradient(180deg, rgba(37,29,24,.94), rgba(37,29,24,.6));
}

.brand{display:flex;align-items:center;gap:16px;min-width:0}
.logo{
  width:96px;height:96px;border-radius:50%;object-fit:cover;
  border:3px solid var(--gold);background:var(--paper);
  box-shadow:var(--shadow-sm);flex:0 0 auto;
}
.brand-text{min-width:0}
.brand-text h1{
  margin:0;font-size:clamp(1.15rem,2.6vw,1.7rem);line-height:1.25;letter-spacing:.2px;
}
.brand-text h1 .cn{color:var(--red);font-weight:800;margin-right:.35em}
.brand-text h1 .en{color:var(--ink);font-weight:600;font-size:.82em}
html[data-theme="dark"] .brand-text h1 .en{color:var(--text)}
.tagline{margin:2px 0 0;color:var(--muted);font-size:.86rem;display:flex;flex-wrap:wrap;gap:6px}
.tagline .sep{opacity:.6}

.header-actions{display:flex;gap:10px;flex-wrap:wrap}

main{
  position:relative;z-index:2;
  width:min(1180px,100%);
  margin:0 auto;
  padding:clamp(16px,3vw,32px) clamp(14px,4vw,28px) 60px;
  display:flex;flex-direction:column;gap:18px;
}

.card{
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow-sm);
}

/* --------- buttons --------- */
.btn{
  font:inherit;font-size:.92rem;font-weight:600;
  padding:10px 16px;border-radius:999px;cursor:pointer;
  border:1px solid var(--line);
  background:var(--cream-2);color:var(--text);
  transition:transform .12s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
  display:inline-flex;align-items:center;gap:8px;
}
.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow-sm)}
.btn:active{transform:translateY(0)}
.btn.primary{
  background:linear-gradient(180deg,var(--red),var(--red-dark));
  color:#fff;border-color:transparent;
}
html[data-theme="dark"] .btn.primary{color:#241c17}
.btn.ok{background:linear-gradient(180deg,#3c9463,#2f7d4f);color:#fff;border-color:transparent}
.btn.warn{background:linear-gradient(180deg,#cd7a26,#b4661b);color:#fff;border-color:transparent}
.btn.ghost{background:transparent}
.btn:focus-visible,.icon-btn:focus-visible,.tab:focus-visible,
input:focus-visible,select:focus-visible,.flashcard:focus-visible{
  outline:3px solid var(--gold);outline-offset:2px;
}

.icon-btn{
  border:1px solid var(--line);background:var(--paper);color:var(--text);
  border-radius:50%;width:40px;height:40px;font-size:1.05rem;cursor:pointer;
  display:inline-flex;align-items:center;justify-content:center;
  transition:transform .12s ease,background .18s ease;
}
.icon-btn:hover{transform:scale(1.07);background:var(--cream-2)}
.icon-btn.star.is-on{color:var(--gold);border-color:var(--gold)}

/* --------- hero --------- */
.hero{
  display:grid;grid-template-columns:minmax(180px,300px) 1fr;gap:clamp(16px,3vw,34px);
  padding:clamp(16px,3vw,30px);align-items:center;overflow:hidden;
  background:
    linear-gradient(135deg, rgba(201,162,39,.10), transparent 45%),
    var(--paper);
}
.hero-cover{margin:0;border-radius:14px;overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow)}
.hero-cover img{width:100%;height:auto}
.kicker{
  margin:0 0 6px;color:var(--red);font-weight:700;font-size:1.05rem;
}
.hero-body h2{margin:0 0 10px;font-size:clamp(1.15rem,2.4vw,1.6rem);color:var(--ink);line-height:1.3}
html[data-theme="dark"] .hero-body h2{color:var(--text)}
.lead{margin:0 0 10px;color:var(--text);opacity:.9;font-size:.97rem}
.stats{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0}
.stat{
  flex:1 1 110px;background:var(--cream-2);border:1px solid var(--line);
  border-radius:14px;padding:10px 14px;text-align:center;
}
.stat b{display:block;font-size:1.4rem;color:var(--red);line-height:1.2}
.stat span{font-size:.78rem;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}
.hero-cta{display:flex;flex-wrap:wrap;gap:10px}

/* --------- tabs --------- */
.tabs{display:flex;flex-wrap:wrap;gap:8px}
.tab{
  font:inherit;font-weight:600;cursor:pointer;
  padding:11px 20px;border-radius:999px;
  border:1px solid var(--line);background:var(--paper);color:var(--text);
  transition:background .18s ease,color .18s ease,box-shadow .18s ease;
}
.tab:hover{box-shadow:var(--shadow-sm)}
.tab.is-active{
  background:linear-gradient(180deg,var(--red),var(--red-dark));color:#fff;border-color:transparent;
}
html[data-theme="dark"] .tab.is-active{color:#241c17}

/* --------- toolbar --------- */
.toolbar{
  display:flex;flex-wrap:wrap;gap:16px 22px;align-items:center;
  padding:14px 18px;
}
.tool-group{display:flex;flex-direction:column;gap:6px;min-width:0}
.tool-group.right{margin-left:auto;justify-content:flex-end}
.tool-label{font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:700}
input[type="search"],select{
  font:inherit;font-size:.92rem;padding:9px 12px;border-radius:12px;
  border:1px solid var(--line);background:var(--cream-2);color:var(--text);min-width:220px;
}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  display:inline-flex;align-items:center;gap:7px;cursor:pointer;user-select:none;position:relative;
  border:1px solid var(--line);border-radius:999px;padding:7px 13px;background:var(--cream-2);
  font-size:.86rem;font-weight:600;
  transition:background .15s ease,color .15s ease;
}
.chip input{position:absolute;opacity:0;width:1px;height:1px;margin:0}
.chip:focus-within{outline:3px solid var(--gold);outline-offset:2px}
.chip.is-on{
  background:linear-gradient(180deg,var(--red),var(--red-dark));
  color:#fff;border-color:transparent;
}
html[data-theme="dark"] .chip.is-on{color:#241c17}
/* word counter inside a level chip */
.chip .cnt{
  display:inline-block;min-width:1.9em;text-align:center;
  background:var(--paper);border:1px solid var(--line);border-radius:999px;
  font-size:.73rem;font-weight:800;line-height:1.6;padding:0 6px;
  color:var(--muted);font-variant-numeric:tabular-nums;
}
.chip .cnt.is-zero{opacity:.45}
.chip.is-on .cnt{
  background:rgba(255,255,255,.24);border-color:transparent;color:#fff;
}
html[data-theme="dark"] .chip.is-on .cnt{
  background:rgba(0,0,0,.16);border-color:transparent;color:#241c17;
}
.deck-info{margin:0;color:var(--muted);font-size:.88rem}

/* --------- views --------- */
.view{display:flex;flex-direction:column;gap:16px}
.hidden{display:none !important}

/* --------- progress --------- */
.progress-wrap{display:flex;align-items:center;gap:14px}
.progress{flex:1;height:10px;border-radius:999px;background:var(--cream-2);border:1px solid var(--line);overflow:hidden}
.progress-bar{height:100%;width:0;border-radius:999px;background:linear-gradient(90deg,var(--gold),var(--red));transition:width .3s ease}
.progress-text{margin:0;font-size:.85rem;color:var(--muted);white-space:nowrap;font-variant-numeric:tabular-nums}

/* --------- flashcard --------- */
.flashcard{
  perspective:1800px;cursor:pointer;border-radius:24px;
  min-height:440px;outline-offset:6px;
}
.fc-inner{
  position:relative;width:100%;min-height:440px;
  transform-style:preserve-3d;transition:transform .6s cubic-bezier(.4,.2,.2,1);
}
.flashcard.is-flipped .fc-inner{transform:rotateY(180deg)}
.fc-face{
  position:absolute;inset:0;
  backface-visibility:hidden;-webkit-backface-visibility:hidden;
  border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);
  padding:clamp(16px,3vw,30px);
  display:flex;flex-direction:column;
  background:
    radial-gradient(600px 300px at 50% 0%, rgba(201,162,39,.13), transparent 70%),
    var(--paper);
  overflow:auto;
}
.fc-front{align-items:center;justify-content:center;text-align:center;gap:6px}
.fc-back{transform:rotateY(180deg)}
.fc-front::before,.fc-back::before{
  content:"";position:absolute;inset:10px;border:2px solid var(--line);border-radius:18px;pointer-events:none;
}
.fc-top{
  position:absolute;top:16px;left:18px;right:18px;
  display:flex;align-items:center;justify-content:space-between;gap:10px;
}
.pill{
  font-size:.76rem;font-weight:700;letter-spacing:.05em;color:var(--muted);
  background:var(--cream-2);border:1px solid var(--line);border-radius:999px;padding:4px 12px;
}
.hanzi{
  font-family:var(--font-cn);
  font-size:clamp(5rem,20vw,11rem);
  line-height:1.05;color:var(--red);font-weight:700;margin:26px 0 4px;
  text-shadow:0 6px 18px rgba(140,29,44,.14);
}
.hanzi-sm{font-family:var(--font-cn);font-size:clamp(2.2rem,7vw,3.4rem);color:var(--red);font-weight:700;line-height:1.1}
.pinyin-front,.pinyin{
  font-size:1.15rem;color:var(--gold);font-weight:700;letter-spacing:.04em;
}
.pinyin{font-size:clamp(1rem,2.6vw,1.3rem)}
.fc-hint{margin:6px 0 0;color:var(--muted);font-size:.84rem}
kbd{
  font-family:ui-monospace,Consolas,monospace;font-size:.78em;
  background:var(--cream-2);border:1px solid var(--line);border-bottom-width:2px;
  border-radius:6px;padding:1px 6px;
}
.back-head{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin:34px 0 6px;justify-content:center}
.meanings{margin:0;display:flex;flex-direction:column;gap:12px}
.meaning{
  border:1px solid var(--line);border-radius:14px;padding:10px 16px;background:var(--cream-2);
}
.meaning dt{
  font-size:.72rem;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);
  font-weight:700;display:flex;align-items:center;gap:7px;
}
.langtag{
  display:inline-block;background:var(--red);color:#fff;border-radius:6px;
  font-size:.66rem;letter-spacing:.1em;padding:1px 6px;line-height:1.5;
}
html[data-theme="dark"] .langtag{color:#241c17}
.meaning dd{margin:4px 0 0;font-size:clamp(1.02rem,2.2vw,1.28rem);font-weight:600;color:var(--text)}
.meaning.m-ar dd{font-size:clamp(1.15rem,2.6vw,1.5rem);text-align:right;font-weight:700}
.meaning.is-off{display:none}
.flag-note{
  margin-top:12px;align-self:center;font-size:.8rem;font-weight:700;color:var(--warn);
  border:1px dashed var(--warn);border-radius:999px;padding:3px 12px;
}
.fc-front .flag-note{position:absolute;top:64px}
.fc-controls{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.fc-controls.second .btn{font-size:.88rem}
.shortcuts{text-align:center;color:var(--muted);font-size:.82rem;margin:0}

/* --------- table --------- */
.table-wrap{overflow:auto;padding:6px}
table{width:100%;border-collapse:collapse;font-size:.95rem}
thead th{
  position:sticky;top:0;z-index:1;
  background:var(--cream-2);color:var(--muted);
  font-size:.74rem;text-transform:uppercase;letter-spacing:.08em;
  text-align:left;padding:12px 14px;border-bottom:2px solid var(--line);white-space:nowrap;
}
tbody td{padding:11px 14px;border-bottom:1px solid var(--line);vertical-align:middle}
tbody tr:hover{background:rgba(201,162,39,.10)}
td.hz{font-family:var(--font-cn);font-size:1.5rem;color:var(--red);font-weight:700;white-space:nowrap}
td.py{color:var(--gold);font-weight:700;white-space:nowrap}
td.ar{font-family:var(--font-ar);font-size:1.2rem;text-align:right;font-weight:600}
.col-num{width:56px}
.col-ar{text-align:right}
.col-act{width:56px;text-align:center}
td.act{text-align:center}
.rowbtn{
  border:1px solid var(--line);background:var(--paper);border-radius:50%;
  width:34px;height:34px;cursor:pointer;font-size:1rem;color:var(--muted);
}
.rowbtn.is-on{color:var(--gold);border-color:var(--gold)}
.word-flagged{color:var(--warn)}
.empty{text-align:center;color:var(--muted);padding:26px}
/* pagination for the long word tables */
.pager{
  display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:center;
  padding:14px 10px 6px;
}
.pager-info{font-size:.86rem;color:var(--muted);font-weight:700;font-variant-numeric:tabular-nums}
.pager .btn[disabled]{opacity:.4;cursor:default;transform:none;box-shadow:none}

/* --------- quiz --------- */
.quiz{padding:clamp(16px,3vw,30px);display:flex;flex-direction:column;gap:18px}
.quiz-top{display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between}
.quiz-score{display:flex;flex-wrap:wrap;gap:8px 18px;font-size:.9rem;color:var(--muted)}
.quiz-score b{color:var(--red);font-size:1.05rem}
.quiz-prompt{text-align:center;display:flex;flex-direction:column;align-items:center;gap:6px}
.quiz-prompt .hanzi{font-size:clamp(4rem,14vw,7.5rem);margin:0}
.quiz-options{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:12px}
.opt{
  font:inherit;font-size:1.05rem;font-weight:600;text-align:left;cursor:pointer;
  padding:16px 18px;border-radius:16px;border:1px solid var(--line);
  background:var(--cream-2);color:var(--text);
  transition:transform .12s ease,box-shadow .18s ease,background .18s ease;
}
.opt[dir="rtl"]{text-align:right;font-family:var(--font-ar);font-size:1.25rem}
.opt:hover{transform:translateY(-2px);box-shadow:var(--shadow-sm)}
.opt.correct{background:linear-gradient(180deg,#3c9463,#2f7d4f);color:#fff;border-color:transparent}
.opt.wrong{background:linear-gradient(180deg,#c0453f,#9d2f2a);color:#fff;border-color:transparent}
.opt:disabled{cursor:default;transform:none}
.quiz-feedback{text-align:center;font-weight:700;margin:0;min-height:1.5em}
.quiz-feedback.good{color:var(--ok)}
.quiz-feedback.bad{color:var(--red)}
.quiz-controls{display:flex;gap:10px;justify-content:center}

/* --------- footer --------- */
.site-footer{
  position:relative;z-index:2;
  border-top:1px solid var(--line);
  padding:22px clamp(14px,4vw,44px) 40px;
  text-align:center;color:var(--muted);font-size:.88rem;
}
.foot-logo{margin:0 auto 10px;border-radius:50%;border:2px solid var(--gold)}
.site-footer p{margin:4px 0}
.site-footer .tiny{font-size:.78rem;opacity:.8}
code{background:var(--cream-2);border:1px solid var(--line);border-radius:6px;padding:1px 6px;font-size:.85em}

/* --------- HSK level badges & selector --------- */
.tool-group.levels{flex:1 1 100%}
.levels .chip{padding:8px 16px;font-weight:700}
.lvl{
  display:inline-block;border-radius:999px;padding:2px 10px;
  font-size:.72rem;font-weight:800;color:#fff;letter-spacing:.05em;
  border:1px solid rgba(0,0,0,.08);line-height:1.6;white-space:nowrap;
}
.lvl-1{background:#3b8b5e}
.lvl-2{background:#5f9e4d}
.lvl-3{background:#87ac3c}
.lvl-4{background:#a3a22e}
.lvl-5{background:#c98f2e}
.lvl-6{background:#d97a38}
.lvl-7{background:#c95e4d}
.fc-pills{display:flex;gap:8px;align-items:center;flex-wrap:wrap}

/* --------- admin --------- */
.rowbtn:hover{background:var(--cream-2)}
.rowbtn.danger:hover{color:#c0453f;border-color:#c0453f;background:rgba(192,69,63,.08)}
.btn.is-logged{border-color:var(--gold)}

/* --------- inputs & forms --------- */
input[type="text"],input[type="password"]{
  font:inherit;font-size:.92rem;padding:9px 12px;border-radius:12px;
  border:1px solid var(--line);background:var(--cream-2);color:var(--text);
}
input:focus-visible,select:focus-visible{outline:3px solid var(--gold);outline-offset:2px}
.ar-input{direction:rtl;font-family:var(--font-ar);font-size:1.05rem}

/* --------- modals --------- */
.modal{
  position:fixed;inset:0;z-index:50;display:flex;align-items:center;justify-content:center;
  padding:16px;background:rgba(30,20,15,.55);backdrop-filter:blur(3px);
}
html[data-theme="dark"] .modal{background:rgba(0,0,0,.62)}
.modal-box{
  background:var(--paper);border:1px solid var(--line);border-radius:16px;
  box-shadow:var(--shadow);width:min(620px,100%);max-height:92vh;overflow:auto;
  padding:22px 24px;position:relative;
}
.modal-box.narrow{width:min(400px,100%)}
.modal-box h3{margin:0 0 14px;color:var(--ink);font-size:1.15rem}
.modal-close{
  position:absolute;top:10px;right:10px;border:none;background:transparent;
  color:var(--muted);font-size:1rem;cursor:pointer;padding:6px 10px;border-radius:8px;
}
.modal-close:hover{background:var(--cream-2);color:var(--text)}
.form-row{margin-bottom:12px}
.form-row label{
  display:block;font-size:.74rem;font-weight:700;text-transform:uppercase;
  letter-spacing:.07em;color:var(--muted);margin-bottom:4px;
}
.modal-box input[type="text"],.modal-box input[type="password"],.modal-box select{
  width:100%;min-width:0;
}
.form-grid{display:grid;grid-template-columns:1fr 1fr;column-gap:14px}
.form-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:16px;flex-wrap:wrap}
.form-error{color:var(--red);font-size:.85rem;font-weight:600;min-height:1.3em;margin:4px 0}
.check-row{align-self:end;display:flex;align-items:center;height:100%}
.check-row .chip{margin-bottom:12px}

/* --------- toast --------- */
.toast{
  position:fixed;left:50%;bottom:26px;z-index:60;
  transform:translateX(-50%) translateY(16px);opacity:0;
  transition:opacity .25s ease,transform .25s ease;pointer-events:none;
  background:var(--ink);color:var(--cream);font-weight:600;font-size:.9rem;
  padding:11px 20px;border-radius:999px;box-shadow:var(--shadow);max-width:90vw;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.toast.err{background:var(--red);color:#fff}

/* --------- responsive --------- */
@media (max-width:860px){
  .hero{grid-template-columns:1fr}
  .hero-cover{max-width:280px;margin:0 auto}
  .tool-group.right{margin-left:0}
  .flashcard,.fc-inner{min-height:400px}
}
@media (max-width:560px){
  .logo{width:64px;height:64px}
  .brand-text h1 .en{display:block;font-size:.9em}
  input[type="search"],select{min-width:0;width:100%}
  .tool-group{width:100%}
  .flashcard,.fc-inner{min-height:380px}
  .fc-controls .btn{flex:1 1 40%}
  .form-grid{grid-template-columns:1fr}
  .modal-box{padding:18px}
}

@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important}
  html{scroll-behavior:auto}
}

/* --------- print: vocabulary list only --------- */
@media print{
  .page-deco,.site-header,.hero,.tabs,.toolbar,.deck-info,#view-study,#view-quiz,#view-admin,
  .modal,.toast,.pager,.site-footer .tiny,.col-act,.rowbtn{display:none !important}
  body{background:#fff;color:#000}
  main{width:100%;padding:0}
  .view.hidden{display:flex !important}
  .card{border:none;box-shadow:none}
  table{font-size:11pt}
  thead th{background:#f2f2f2;color:#000}
  tbody tr{break-inside:avoid}
  td.hz{color:#000}
  td.py{color:#333}
}