@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@500;700;900&family=Noto+Sans+SC:wght@400;500;700&display=swap');

:root{
  --bg:#0d1b2a;
  --bg-panel:#142a3d;
  --card:#193249;
  --card-hover:#1e3b56;
  --line:#2a4a68;
  --gold:#c9a24b;
  --gold-light:#e6c878;
  --ink:#f2ead6;
  --muted:#8ea3b8;
  --jade:#3f9179;
  --rose:#c1594e;
  --radius:10px;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(201,162,75,.08), transparent 60%),
    var(--bg);
  color:var(--ink);
  font-family:'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  line-height:1.6;
  min-height:100vh;
}
h1,h2,h3,.serif{font-family:'Noto Serif SC', serif;}
a{color:var(--gold-light); text-decoration:none;}
a:hover{text-decoration:underline;}
:focus-visible{outline:2px solid var(--gold-light); outline-offset:2px;}

.container{max-width:1080px; margin:0 auto; padding:0 24px;}
.container-narrow{max-width:640px; margin:0 auto; padding:0 24px;}

/* ---------- Navbar ---------- */
.navbar{
  position:sticky; top:0; z-index:50;
  background:rgba(13,27,42,.9);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.navbar-inner{max-width:1080px; margin:0 auto; padding:14px 24px; display:flex; align-items:center; justify-content:space-between;}
.brand{display:flex; align-items:center; gap:10px; font-family:'Noto Serif SC',serif; font-weight:900; font-size:20px; color:var(--ink);}
.brand .seal{
  width:34px; height:34px; border-radius:50%; border:2px solid var(--gold);
  display:flex; align-items:center; justify-content:center; color:var(--gold); font-size:15px; font-weight:900;
}
.nav-links{display:flex; gap:6px; align-items:center;}
.nav-links a{
  color:var(--muted); font-size:14px; padding:8px 14px; border-radius:6px;
}
.nav-links a.active, .nav-links a:hover{color:var(--ink); background:var(--card); text-decoration:none;}
.nav-user{color:var(--gold-light); font-size:14px; margin-left:8px;}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:11px 22px; border-radius:8px; border:1px solid transparent;
  font-size:15px; font-weight:700; cursor:pointer; font-family:inherit;
  transition:transform .15s ease, background .15s ease, border-color .15s ease;
}
.btn:active{transform:translateY(1px);}
.btn-gold{background:linear-gradient(180deg,var(--gold-light),var(--gold)); color:#20160a;}
.btn-gold:hover{filter:brightness(1.06); text-decoration:none;}
.btn-ghost{background:transparent; border-color:var(--line); color:var(--ink);}
.btn-ghost:hover{border-color:var(--gold); text-decoration:none;}
.btn-jade{background:var(--jade); color:#eafff6;}
.btn-rose{background:var(--rose); color:#fff0ee;}
.btn-block{width:100%;}
.btn-lg{padding:14px 28px; font-size:16px;}
.btn:disabled{opacity:.45; cursor:not-allowed;}

/* ---------- Hero ---------- */
.hero{padding:96px 0 64px; position:relative; overflow:hidden;}
.hero::before{
  content:''; position:absolute; inset:0;
  background-image: repeating-linear-gradient(180deg, rgba(201,162,75,.05) 0 1px, transparent 1px 44px);
  pointer-events:none;
}
.hero-eyebrow{color:var(--gold-light); letter-spacing:.18em; font-size:13px; text-transform:uppercase; margin-bottom:18px;}
.hero h1{font-size:44px; line-height:1.3; margin:0 0 20px; max-width:680px;}
.hero p{color:var(--muted); font-size:17px; max-width:560px; margin-bottom:36px;}
.hero-stats{display:flex; gap:36px; margin-top:56px; flex-wrap:wrap;}
.hero-stat b{display:block; font-family:'Noto Serif SC',serif; font-size:30px; color:var(--gold-light);}
.hero-stat span{color:var(--muted); font-size:13px;}

/* ---------- Cards ---------- */
.card{
  background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:24px; box-shadow:var(--shadow);
}
.grid{display:grid; gap:20px;}
.grid-2{grid-template-columns:repeat(2,1fr);}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}
@media(max-width:760px){ .grid-2,.grid-3,.grid-4{grid-template-columns:1fr;} .hero h1{font-size:32px;} }

.feature-card{
  background:var(--bg-panel); border:1px solid var(--line); border-radius:var(--radius);
  padding:26px; transition:border-color .15s, transform .15s;
}
.feature-card:hover{border-color:var(--gold); transform:translateY(-3px);}
.feature-card .icon{
  width:44px; height:44px; border-radius:8px; display:flex; align-items:center; justify-content:center;
  background:rgba(201,162,75,.12); color:var(--gold-light); font-size:20px; margin-bottom:14px;
}
.feature-card h3{margin:0 0 8px; font-size:18px;}
.feature-card p{margin:0; color:var(--muted); font-size:14px;}

/* ---------- Auth forms ---------- */
.auth-wrap{min-height:calc(100vh - 66px); display:flex; align-items:center; justify-content:center; padding:40px 20px;}
.auth-card{width:100%; max-width:400px;}
.auth-card h1{font-size:26px; margin-bottom:6px;}
.auth-card .sub{color:var(--muted); font-size:14px; margin-bottom:28px;}
.field{margin-bottom:18px;}
.field label{display:block; font-size:13px; color:var(--muted); margin-bottom:7px;}
.field input{
  width:100%; padding:12px 14px; border-radius:8px; border:1px solid var(--line);
  background:var(--bg-panel); color:var(--ink); font-size:15px; font-family:inherit;
}
.field input:focus{border-color:var(--gold); outline:none;}
.form-error{background:rgba(193,89,78,.12); border:1px solid var(--rose); color:#ffd7d1; padding:10px 14px; border-radius:8px; font-size:13.5px; margin-bottom:18px;}
.form-note{background:rgba(63,145,121,.12); border:1px solid var(--jade); color:#d3ffef; padding:10px 14px; border-radius:8px; font-size:13.5px; margin-bottom:18px;}
.auth-switch{margin-top:22px; text-align:center; color:var(--muted); font-size:14px;}

/* ---------- Progress ribbon (signature element) ---------- */
.ribbon-card{position:relative; overflow:hidden;}
.ribbon{
  position:absolute; top:0; right:22px; width:40px; padding-top:10px; text-align:center;
  background:linear-gradient(180deg,var(--gold-light),var(--gold)); color:#20160a; font-weight:900; font-size:13px;
  clip-path:polygon(0 0,100% 0,100% 100%,50% 82%,0 100%);
  padding-bottom:14px;
}
.progress-track{height:10px; border-radius:6px; background:var(--bg-panel); overflow:hidden; border:1px solid var(--line);}
.progress-fill{height:100%; background:linear-gradient(90deg,var(--gold),var(--gold-light)); border-radius:6px;}

.stat-row{display:flex; justify-content:space-between; align-items:baseline; margin-bottom:6px;}
.stat-row b{font-family:'Noto Serif SC',serif; font-size:24px; color:var(--gold-light);}
.stat-label{color:var(--muted); font-size:13px;}

/* ---------- Dashboard quick actions ---------- */
.action-card{
  display:block; padding:22px; border-radius:var(--radius); border:1px solid var(--line);
  background:var(--card); transition:border-color .15s, transform .15s;
}
.action-card:hover{border-color:var(--gold); transform:translateY(-2px); text-decoration:none;}
.action-card .title{color:var(--ink); font-family:'Noto Serif SC',serif; font-size:19px; margin-bottom:6px;}
.action-card .desc{color:var(--muted); font-size:13.5px;}

/* ---------- Flashcard (study page) ---------- */
.study-shell{max-width:560px; margin:0 auto; padding:40px 20px;}
.study-progress{display:flex; align-items:center; gap:12px; margin-bottom:26px; color:var(--muted); font-size:13px;}
.study-progress .progress-track{flex:1;}

.flashcard{
  position:relative; min-height:340px; border-radius:16px;
  background:var(--card); border:1px solid var(--line);
  box-shadow:var(--shadow);
  display:flex; flex-direction:column; align-items:center; justify-content:center; text-align:center;
  padding:40px 30px;
}
.flashcard::before{ /* perforated top edge like a library index card */
  content:''; position:absolute; top:14px; left:24px; right:24px; height:1px;
  background-image:linear-gradient(90deg, var(--line) 60%, transparent 0%);
  background-size:10px 1px; background-repeat:repeat-x;
}
.flashcard .order-tag{position:absolute; top:16px; left:22px; color:var(--muted); font-size:12px; letter-spacing:.05em;}
.flashcard .word{font-family:'Noto Serif SC',serif; font-size:42px; font-weight:900; color:var(--ink); margin-bottom:10px;}
.flashcard .phonetic{color:var(--gold-light); font-size:16px; margin-bottom:26px; font-family:'Noto Serif SC',serif;}
.flashcard .meaning{display:none; color:var(--ink); font-size:18px; max-width:400px; line-height:1.8;}
.flashcard.revealed .meaning{display:block;}
.flashcard .reveal-hint{color:var(--muted); font-size:13px; margin-top:8px;}
.flashcard.revealed .reveal-hint{display:none;}
.flashcard .extra-link{margin-top:18px; font-size:13px;}

.study-actions{display:flex; gap:14px; margin-top:26px;}
.study-actions .btn{flex:1;}

/* ---------- Quiz / Dictation ---------- */
.quiz-shell{max-width:560px; margin:0 auto; padding:40px 20px;}
.quiz-card{padding:34px;}
.quiz-meaning{font-size:20px; line-height:1.8; margin-bottom:28px; color:var(--ink);}
.quiz-meaning .tag{display:inline-block; color:var(--gold-light); font-size:12px; letter-spacing:.1em; margin-bottom:10px;}
.quiz-options{display:grid; gap:12px;}
.quiz-option{
  text-align:left; padding:14px 18px; border-radius:8px; border:1px solid var(--line);
  background:var(--bg-panel); color:var(--ink); font-size:16px; cursor:pointer; font-family:inherit;
  transition:border-color .15s, background .15s;
}
.quiz-option:hover:not(:disabled){border-color:var(--gold);}
.quiz-option.correct{border-color:var(--jade); background:rgba(63,145,121,.18);}
.quiz-option.wrong{border-color:var(--rose); background:rgba(193,89,78,.18);}
.quiz-option:disabled{cursor:default;}

.dictation-input{
  width:100%; padding:16px 18px; font-size:20px; border-radius:8px; border:1px solid var(--line);
  background:var(--bg-panel); color:var(--ink); font-family:'Noto Serif SC',serif; letter-spacing:.02em;
}
.dictation-input.correct{border-color:var(--jade);}
.dictation-input.wrong{border-color:var(--rose);}
.dictation-feedback{margin-top:14px; font-size:14.5px; min-height:20px;}
.dictation-feedback.correct{color:#a8f2d6;}
.dictation-feedback.wrong{color:#ffb9ae;}

.quiz-footer{display:flex; justify-content:space-between; align-items:center; margin-top:22px; color:var(--muted); font-size:13px;}

/* ---------- Search ---------- */
.search-box{position:relative; margin-bottom:26px;}
.search-box input{
  width:100%; padding:15px 18px; font-size:16px; border-radius:10px; border:1px solid var(--line);
  background:var(--card); color:var(--ink); font-family:inherit;
}
.search-results{display:flex; flex-direction:column; gap:12px;}
.result-row{
  display:flex; justify-content:space-between; align-items:center; gap:16px;
  padding:16px 18px; border-radius:10px; background:var(--card); border:1px solid var(--line);
}
.result-row .w{font-family:'Noto Serif SC',serif; font-weight:700; font-size:18px;}
.result-row .p{color:var(--gold-light); font-size:13px; margin-left:10px;}
.result-row .m{color:var(--muted); font-size:14px; margin-top:4px;}
.result-row a.dict-link{font-size:12.5px; white-space:nowrap;}

/* ---------- Footer ---------- */
footer{border-top:1px solid var(--line); margin-top:80px; padding:28px 0; color:var(--muted); font-size:13px; text-align:center;}

/* ---------- Utility ---------- */
.mt-8{margin-top:8px;} .mt-16{margin-top:16px;} .mt-24{margin-top:24px;} .mt-32{margin-top:32px;}
.mb-8{margin-bottom:8px;} .mb-16{margin-bottom:16px;} .mb-24{margin-bottom:24px;}
.text-muted{color:var(--muted);}
.text-center{text-align:center;}
.section-title{font-size:26px; margin-bottom:10px;}
.section-sub{color:var(--muted); margin-bottom:36px;}
.badge{display:inline-block; padding:3px 10px; border-radius:20px; font-size:12px; font-weight:700;}
.badge-jade{background:rgba(63,145,121,.18); color:#a8f2d6;}
.badge-gold{background:rgba(201,162,75,.18); color:var(--gold-light);}
.empty-state{text-align:center; padding:60px 20px; color:var(--muted);}