/* ============================================================
   漢字Learn — Premium Design System v2.0
   ============================================================ */
:root {
  --red:#E8593C;--red2:#c0392b;--red-light:#fff0ec;
  --gold:#F2A623;--gold-light:#fff9ed;
  --jade:#16a34a;--jade-light:#f0fdf4;
  --blue:#3b82f6;--blue-light:#eff6ff;
  --purple:#7c3aed;--purple-light:#f5f3ff;
  --ink:#1a1a2e;--ink2:#16213e;--ink3:#2d2d44;
  --surface:#ffffff;--surface2:#f9fafb;--surface3:#f3f4f6;
  --border:#e5e7eb;--border2:#d1d5db;
  --text:#111827;--text2:#4b5563;--text3:#9ca3af;
  --shadow:0 1px 3px rgba(0,0,0,.08),0 4px 16px rgba(0,0,0,.06);
  --shadow-md:0 4px 24px rgba(0,0,0,.1);
  --shadow-lg:0 12px 48px rgba(0,0,0,.15);
  --shadow-xl:0 24px 80px rgba(0,0,0,.22);
  --r4:4px;--r8:8px;--r12:12px;--r16:16px;--r24:24px;--r50:50px;
  --nav-h:64px;
  --transition:.2s cubic-bezier(.4,0,.2,1);
  --font:'Inter',system-ui,sans-serif;
  --font-zh:'Noto Serif SC','Source Han Serif CN',serif;
}
@media(prefers-color-scheme:dark){
  :root{
    --surface:#0f0f1a;--surface2:#161625;--surface3:#1e1e30;
    --border:#2d2d44;--border2:#3a3a52;
    --text:#f1f5f9;--text2:#94a3b8;--text3:#475569;
    --red-light:rgba(232,89,60,.12);--gold-light:rgba(242,166,35,.1);
    --jade-light:rgba(22,163,74,.1);--blue-light:rgba(59,130,246,.1);
    --shadow:0 1px 3px rgba(0,0,0,.3),0 4px 16px rgba(0,0,0,.2);
    --shadow-md:0 4px 24px rgba(0,0,0,.3);
    --shadow-lg:0 12px 48px rgba(0,0,0,.4);
  }
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);background:var(--surface2);color:var(--text);min-height:100vh;-webkit-font-smoothing:antialiased;line-height:1.5}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
button{font-family:inherit;cursor:pointer}
input,select,textarea{font-family:inherit}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar{width:6px;height:6px}
::-webkit-scrollbar-track{background:var(--surface3)}
::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:var(--text3)}

/* ===== NAVBAR ===== */
#navbar{
  position:fixed;top:0;left:0;right:0;height:var(--nav-h);
  background:rgba(255,255,255,.88);backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border);z-index:100;transition:background var(--transition)
}
@media(prefers-color-scheme:dark){#navbar{background:rgba(15,15,26,.9)}}
.nav-inner{max-width:1280px;margin:0 auto;padding:0 1.5rem;height:100%;display:flex;align-items:center;gap:1rem}
.nav-logo{display:flex;align-items:center;gap:.35rem;font-size:1.25rem;font-weight:800;flex-shrink:0;color:var(--text)}
.nav-logo-zh{font-family:var(--font-zh);font-size:1.6rem;color:var(--red);line-height:1}
.nav-links{display:flex;gap:.15rem;flex:1}
.nav-link{padding:.4rem .85rem;border-radius:var(--r8);font-size:.875rem;font-weight:500;color:var(--text2);transition:all var(--transition)}
.nav-link:hover,.nav-link.active{background:var(--surface3);color:var(--text)}
.nav-link.active{color:var(--red)}
.nav-right{display:flex;align-items:center;gap:.5rem;margin-left:auto}
.btn-lang{background:var(--surface3);border:1px solid var(--border);border-radius:var(--r8);padding:.3rem .7rem;font-size:.75rem;font-weight:700;cursor:pointer;color:var(--text2);transition:all var(--transition);letter-spacing:.02em}
.btn-lang:hover{border-color:var(--red);color:var(--red)}
#nav-notif{position:relative;width:34px;height:34px;border:none;background:var(--surface3);border-radius:var(--r8);display:flex;align-items:center;justify-content:center;font-size:1rem;cursor:pointer;transition:all var(--transition)}
#nav-notif:hover{background:var(--border)}
.notif-badge{position:absolute;top:-3px;right:-3px;background:var(--red);color:#fff;font-size:.6rem;font-weight:800;border-radius:10px;padding:.05rem .3rem;min-width:16px;text-align:center;display:none}
.notif-badge.show{display:block}
.nav-xp{background:var(--gold);color:#fff;font-size:.72rem;font-weight:800;padding:.22rem .55rem;border-radius:var(--r50);letter-spacing:.02em}
.nav-streak{font-size:.82rem;font-weight:800;padding:.22rem .5rem;background:linear-gradient(135deg,#fff3e0,#ffe0b2);border-radius:var(--r50);color:#e65100}
@media(prefers-color-scheme:dark){.nav-streak{background:rgba(255,152,0,.15);color:#ffa726}}
.nav-avatar{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--red),var(--gold));color:#fff;font-weight:800;font-size:.82rem;display:flex;align-items:center;justify-content:center;cursor:pointer;border:2px solid var(--border);transition:border-color var(--transition)}
.nav-avatar:hover{border-color:var(--red)}
.btn-nav-outline{background:transparent;border:1.5px solid var(--border);border-radius:var(--r8);padding:.38rem .85rem;font-size:.82rem;font-weight:600;cursor:pointer;color:var(--text);transition:all var(--transition)}
.btn-nav-outline:hover{border-color:var(--red);color:var(--red)}
.btn-nav-primary{background:var(--red);border:none;border-radius:var(--r8);padding:.42rem .95rem;font-size:.82rem;font-weight:700;cursor:pointer;color:#fff;transition:all var(--transition)}
.btn-nav-primary:hover{background:var(--red2);transform:translateY(-1px)}
.hamburger{display:none;background:none;border:none;font-size:1.3rem;cursor:pointer;color:var(--text);padding:.3rem}

/* ===== APP SHELL ===== */
#app{padding-top:var(--nav-h);min-height:100vh}
.page{display:none;min-height:calc(100vh - var(--nav-h))}
.page.active{display:block}
.container{max-width:1280px;margin:0 auto;padding:0 1.5rem}

/* ===== HERO ===== */
.hero{
  position:relative;min-height:92vh;display:flex;align-items:center;justify-content:center;
  overflow:hidden;background:linear-gradient(135deg,#0d0d1a 0%,#1a1a2e 40%,#0f2a4a 75%,#0d1f3c 100%);color:#fff
}
.hero-particles{position:absolute;inset:0;pointer-events:none}
.hero-char{
  position:absolute;font-family:var(--font-zh);font-weight:900;line-height:1;user-select:none;
  background:linear-gradient(135deg,rgba(232,89,60,.15),rgba(242,166,35,.1));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent
}
.hc1{font-size:28vw;top:-8%;left:-6%;animation:float1 12s ease-in-out infinite}
.hc2{font-size:18vw;top:5%;right:-4%;animation:float2 14s ease-in-out infinite}
.hc3{font-size:24vw;bottom:-12%;left:15%;animation:float3 16s ease-in-out infinite}
.hc4{font-size:12vw;bottom:8%;right:8%;animation:float1 10s ease-in-out infinite reverse}
@keyframes float1{0%,100%{transform:translateY(0) rotate(-2deg)}50%{transform:translateY(-20px) rotate(2deg)}}
@keyframes float2{0%,100%{transform:translateY(0) rotate(3deg)}50%{transform:translateY(-30px) rotate(-1deg)}}
@keyframes float3{0%,100%{transform:translateY(0) rotate(-1deg)}50%{transform:translateY(-15px) rotate(3deg)}}
.hero-glow{position:absolute;width:600px;height:600px;border-radius:50%;background:radial-gradient(circle,rgba(232,89,60,.12),transparent 70%);top:50%;left:50%;transform:translate(-50%,-50%);pointer-events:none}
.hero-content{position:relative;text-align:center;padding:3rem 1.5rem;max-width:780px;z-index:1}
.hero-badge{
  display:inline-flex;align-items:center;gap:.5rem;
  background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.15);
  border-radius:var(--r50);padding:.45rem 1.25rem;font-size:.82rem;margin-bottom:1.75rem;
  backdrop-filter:blur(8px);letter-spacing:.02em
}
.hero-title{margin-bottom:1.25rem}
.title-zh{
  display:block;font-family:var(--font-zh);font-size:clamp(2.8rem,8vw,6rem);font-weight:900;line-height:1.05;
  background:linear-gradient(135deg,#ffffff 20%,#F2A623 60%,#E8593C 100%);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent
}
.title-en{display:block;font-size:clamp(1.1rem,2.5vw,1.6rem);font-weight:300;opacity:.8;letter-spacing:.06em;margin-top:.5rem}
.hero-sub{font-size:clamp(.9rem,1.5vw,1.1rem);opacity:.7;line-height:1.8;max-width:560px;margin:0 auto 2.25rem}
.hero-actions{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;margin-bottom:3rem}
.btn-hero-cta{
  background:linear-gradient(135deg,var(--red),#c0392b);color:#fff;border:none;
  border-radius:var(--r50);padding:.9rem 2.4rem;font-size:1rem;font-weight:700;
  cursor:pointer;transition:all .3s;box-shadow:0 8px 30px rgba(232,89,60,.45);letter-spacing:.02em
}
.btn-hero-cta:hover{transform:translateY(-2px);box-shadow:0 14px 40px rgba(232,89,60,.55)}
.btn-hero-ghost{
  background:rgba(255,255,255,.08);color:#fff;border:1.5px solid rgba(255,255,255,.25);
  border-radius:var(--r50);padding:.9rem 2.2rem;font-size:1rem;font-weight:500;
  cursor:pointer;transition:all .3s;backdrop-filter:blur(8px)
}
.btn-hero-ghost:hover{background:rgba(255,255,255,.16);border-color:rgba(255,255,255,.5)}
.hero-stats{display:flex;gap:2.5rem;justify-content:center;flex-wrap:wrap}
.hstat{text-align:center}
.hstat-n{display:block;font-size:1.6rem;font-weight:800}
.hstat-l{display:block;font-size:.75rem;opacity:.55;margin-top:.15rem;letter-spacing:.05em;text-transform:uppercase}
.hero-scroll{position:absolute;bottom:2rem;left:50%;transform:translateX(-50%);display:flex;flex-direction:column;align-items:center;gap:.4rem;opacity:.5;animation:bounce 2s infinite}
.hero-scroll span{font-size:.72rem;letter-spacing:.1em;text-transform:uppercase}
@keyframes bounce{0%,100%{transform:translateX(-50%) translateY(0)}50%{transform:translateX(-50%) translateY(6px)}}

/* ===== SECTIONS ===== */
.section{padding:5rem 1.5rem;max-width:1280px;margin:0 auto}
.section-label{font-size:.72rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--red);margin-bottom:.6rem}
.section-title{font-size:clamp(1.6rem,3vw,2.5rem);font-weight:800;color:var(--text);margin-bottom:.6rem;line-height:1.2}
.section-sub{font-size:1rem;color:var(--text2);max-width:540px;margin-bottom:2.5rem;line-height:1.7}

/* ===== FEATURE CARDS ===== */
.feat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1.25rem}
.feat-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--r16);
  padding:1.75rem 1.4rem;cursor:pointer;transition:all .25s;position:relative;overflow:hidden
}
.feat-card::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,var(--red-light),transparent);opacity:0;transition:opacity .25s}
.feat-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:var(--red)}
.feat-card:hover::before{opacity:1}
.feat-icon-wrap{width:52px;height:52px;border-radius:var(--r12);background:var(--red-light);display:flex;align-items:center;justify-content:center;font-size:1.5rem;margin-bottom:1.1rem;transition:background var(--transition)}
.feat-card:hover .feat-icon-wrap{background:var(--red);font-size:1.6rem}
.feat-name{font-size:1rem;font-weight:700;margin-bottom:.4rem}
.feat-desc{font-size:.83rem;color:var(--text2);line-height:1.55}

/* ===== HSK LEVELS ===== */
.hsk-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(148px,1fr));gap:1rem}
.hsk-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r12);padding:1.25rem;text-align:center;cursor:pointer;transition:all .2s}
.hsk-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.hsk-num{font-family:var(--font-zh);font-size:2.2rem;font-weight:900;line-height:1;margin-bottom:.5rem}
.hsk-pill{display:inline-block;font-size:.7rem;font-weight:700;padding:.2rem .65rem;border-radius:var(--r50);margin-bottom:.5rem;letter-spacing:.03em}
.hsk-cnt{font-size:.78rem;color:var(--text2)}
.hsk-bar{height:4px;border-radius:2px;margin-top:.75rem;background:var(--surface3)}
.hsk-bar-fill{height:100%;border-radius:2px;transition:width .6s ease}

/* ===== PAGE HEADER ===== */
.page-hdr{padding:2rem 0 1rem;display:flex;flex-wrap:wrap;align-items:flex-start;gap:1rem;justify-content:space-between}
.page-hdr-title{font-size:1.6rem;font-weight:800}
.page-hdr-sub{font-size:.875rem;color:var(--text2);margin-top:.2rem}

/* ===== FILTERS ===== */
.filters{display:flex;gap:.6rem;flex-wrap:wrap;align-items:center}
.filter-select,.filter-input{border:1.5px solid var(--border);border-radius:var(--r8);padding:.42rem .85rem;font-size:.85rem;background:var(--surface);color:var(--text);outline:none;transition:border-color var(--transition)}
.filter-select:focus,.filter-input:focus{border-color:var(--red)}
.filter-input{flex:1;min-width:200px}
.filter-btn{background:var(--red);border:none;border-radius:var(--r8);padding:.42rem 1rem;font-size:.85rem;font-weight:600;color:#fff;cursor:pointer;transition:all var(--transition)}
.filter-btn:hover{background:var(--red2)}

/* ===== WORDS GRID ===== */
.words-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(188px,1fr));gap:1rem;padding-bottom:2rem}
.word-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r12);padding:1.2rem;cursor:pointer;transition:all .2s;position:relative}
.word-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--red)}
.word-hanzi{font-family:var(--font-zh);font-size:2.1rem;font-weight:800;line-height:1.15;margin-bottom:.3rem;color:var(--text)}
.word-pinyin{font-size:.8rem;color:var(--red);font-weight:600;margin-bottom:.4rem;letter-spacing:.02em}
.word-en{font-size:.875rem;font-weight:500;color:var(--text);line-height:1.35}
.word-bn{font-size:.8rem;color:var(--text2);margin-top:.15rem;line-height:1.3}
.word-foot{display:flex;align-items:center;justify-content:space-between;margin-top:.85rem;padding-top:.7rem;border-top:1px solid var(--border)}
.hsk-tag{font-size:.68rem;font-weight:700;padding:.15rem .5rem;border-radius:var(--r50);background:var(--surface3);color:var(--text2);letter-spacing:.04em}
.star-btn{background:none;border:none;font-size:1.15rem;cursor:pointer;padding:.1rem;transition:all .2s;line-height:1;color:var(--text3)}
.star-btn:hover{transform:scale(1.3)}
.star-btn.on{color:var(--gold)}
.word-learned-dot{position:absolute;top:.7rem;right:.7rem;width:8px;height:8px;border-radius:50%;background:var(--jade)}

/* ===== WORD DETAIL MODAL ===== */
.wd-hanzi{font-family:var(--font-zh);font-size:4.5rem;font-weight:900;text-align:center;margin-bottom:.4rem;background:linear-gradient(135deg,var(--red),var(--gold));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.wd-pinyin{text-align:center;font-size:1.1rem;color:var(--red);font-weight:600;margin-bottom:1rem;letter-spacing:.04em}
.wd-strokes{display:flex;align-items:center;justify-content:center;gap:.5rem;font-size:.78rem;color:var(--text3);margin-bottom:1rem}
.wd-meanings{background:var(--surface2);border-radius:var(--r12);padding:1rem;margin-bottom:1rem}
.wd-meaning-row{display:flex;gap:.6rem;align-items:baseline;margin-bottom:.3rem}
.wd-lang{font-size:.7rem;font-weight:800;color:var(--text3);width:26px;text-transform:uppercase;letter-spacing:.05em;flex-shrink:0}
.wd-val{font-size:1rem;color:var(--text)}
.wd-example{background:var(--surface2);border-left:3px solid var(--red);border-radius:0 var(--r8) var(--r8) 0;padding:.85rem 1rem;margin-bottom:1rem}
.wd-ex-cn{font-family:var(--font-zh);font-size:1.05rem;margin-bottom:.25rem}
.wd-ex-pin{font-size:.78rem;color:var(--red);margin-bottom:.25rem}
.wd-ex-en{font-size:.85rem;color:var(--text2)}
.wd-ex-bn{font-size:.82rem;color:var(--text3)}
.wd-actions{display:flex;gap:.75rem;flex-wrap:wrap}
.wd-actions button{flex:1;min-width:100px}
.wd-notes-area{width:100%;border:1.5px solid var(--border);border-radius:var(--r8);padding:.6rem .8rem;font-size:.85rem;background:var(--surface);color:var(--text);resize:vertical;min-height:70px;outline:none;font-family:inherit;transition:border-color var(--transition)}
.wd-notes-area:focus{border-color:var(--red)}

/* ===== BUTTONS ===== */
.btn{border:none;border-radius:var(--r8);padding:.5rem 1.1rem;font-size:.875rem;font-weight:600;cursor:pointer;transition:all var(--transition);display:inline-flex;align-items:center;gap:.4rem}
.btn-primary{background:var(--red);color:#fff}
.btn-primary:hover{background:var(--red2);transform:translateY(-1px)}
.btn-outline{background:transparent;border:1.5px solid var(--border);color:var(--text)}
.btn-outline:hover{border-color:var(--red);color:var(--red)}
.btn-success{background:var(--jade);color:#fff}
.btn-success:hover{background:#15803d}
.btn-gold{background:var(--gold);color:#fff}
.btn-gold:hover{background:#d97706}
.btn-lg{padding:.75rem 1.5rem;font-size:1rem;border-radius:var(--r12)}
.btn-block{width:100%;justify-content:center}

/* ===== PRACTICE / DRAWING ===== */
.practice-wrap{max-width:680px;margin:0 auto}
.practice-top{background:var(--surface);border:1px solid var(--border);border-radius:var(--r16);padding:1.5rem;margin-bottom:1.5rem;display:flex;align-items:center;gap:1.5rem;flex-wrap:wrap}
.practice-word-big{font-family:var(--font-zh);font-size:4rem;font-weight:900;color:var(--text);line-height:1}
.practice-info{flex:1;min-width:160px}
.practice-pinyin{font-size:1rem;color:var(--red);font-weight:600;margin-bottom:.3rem}
.practice-meaning{font-size:.9rem;color:var(--text2)}
.canvas-outer{position:relative;border-radius:var(--r16);overflow:hidden;border:2px solid var(--border);background:var(--surface);display:inline-block}
#drawing-canvas{display:block;cursor:crosshair;background:var(--surface);touch-action:none}
.canvas-grid{position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(var(--border) 1px,transparent 1px),linear-gradient(90deg,var(--border) 1px,transparent 1px);background-size:50% 50%;opacity:.4}
.canvas-ref{position:absolute;inset:0;pointer-events:none;display:flex;align-items:center;justify-content:center;font-family:var(--font-zh);font-size:240px;font-weight:900;color:var(--text);opacity:0;transition:opacity .3s;user-select:none}
.stroke-result{display:flex;align-items:center;gap:.75rem;margin-top:1rem;padding:1rem;background:var(--surface);border-radius:var(--r12);border:1px solid var(--border)}
.stroke-score-circle{width:60px;height:60px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.1rem;font-weight:800;flex-shrink:0}
.score-great{background:var(--jade-light);color:var(--jade);border:2px solid var(--jade)}
.score-good{background:var(--gold-light);color:var(--gold);border:2px solid var(--gold)}
.score-try{background:var(--red-light);color:var(--red);border:2px solid var(--red)}

/* ===== QUIZ ===== */
.quiz-wrap{max-width:660px;margin:0 auto}
.quiz-setup-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r16);padding:2rem}
.qtype-grid{display:grid;grid-template-columns:1fr 1fr;gap:.75rem;margin-bottom:1.5rem}
.qtype-card{background:var(--surface2);border:2px solid var(--border);border-radius:var(--r12);padding:1rem;cursor:pointer;transition:all .2s;text-align:center}
.qtype-card:hover{border-color:var(--red)}
.qtype-card.selected{border-color:var(--red);background:var(--red-light)}
.qtype-card input{display:none}
.qtype-icon{font-size:1.6rem;margin-bottom:.35rem}
.qtype-name{font-size:.85rem;font-weight:700}
.qtype-desc{font-size:.72rem;color:var(--text2);margin-top:.15rem}
.quiz-prog{display:flex;align-items:center;gap:.75rem;margin-bottom:1.5rem}
.quiz-prog-bar{flex:1;height:8px;background:var(--surface3);border-radius:4px;overflow:hidden}
.quiz-prog-fill{height:100%;background:linear-gradient(90deg,var(--red),var(--gold));border-radius:4px;transition:width .4s}
.quiz-cnt{font-size:.82rem;color:var(--text3);white-space:nowrap}
.quiz-q-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r16);padding:2rem;text-align:center}
.quiz-hanzi{font-family:var(--font-zh);font-size:4rem;font-weight:900;margin:1rem 0;color:var(--text)}
.quiz-hint{font-size:.85rem;color:var(--text3);margin-bottom:1.5rem}
.choices-grid{display:grid;grid-template-columns:1fr 1fr;gap:.75rem}
.choice-btn{background:var(--surface2);border:2px solid var(--border);border-radius:var(--r12);padding:.9rem 1rem;font-size:.9rem;font-weight:500;cursor:pointer;transition:all .2s;text-align:left}
.choice-btn:hover:not(.locked){border-color:var(--red);background:var(--red-light);color:var(--red)}
.choice-btn.correct{border-color:var(--jade);background:var(--jade-light);color:var(--jade)}
.choice-btn.wrong{border-color:var(--red);background:var(--red-light);color:var(--red)}
.choice-btn.locked{cursor:not-allowed}
.fill-input{width:100%;padding:.75rem 1rem;border:2px solid var(--border);border-radius:var(--r12);font-size:1.1rem;text-align:center;outline:none;background:var(--surface);color:var(--text);transition:border-color var(--transition)}
.fill-input:focus{border-color:var(--red)}
.flashcard{background:var(--surface);border:2px solid var(--border);border-radius:var(--r16);padding:3rem 2rem;min-height:220px;cursor:pointer;transition:all .3s;perspective:1000px;text-align:center}
.flashcard:hover{border-color:var(--red);box-shadow:var(--shadow-md)}
.quiz-result{background:var(--surface);border:1px solid var(--border);border-radius:var(--r16);padding:2.5rem;text-align:center}
.result-emoji{font-size:4rem;margin-bottom:1rem}
.result-pct{font-size:3rem;font-weight:900}
.result-msg{font-size:1rem;color:var(--text2);margin:.5rem 0 1.5rem}
.result-stats{display:flex;gap:1.5rem;justify-content:center;margin-bottom:1.5rem;flex-wrap:wrap}
.rstat{text-align:center}
.rstat-n{font-size:1.4rem;font-weight:800}
.rstat-l{font-size:.75rem;color:var(--text2);margin-top:.1rem}

/* ===== PROFILE ===== */
.profile-hero{
  background:linear-gradient(135deg,var(--ink) 0%,var(--ink2) 100%);color:#fff;
  border-radius:var(--r16);padding:2rem;margin-bottom:1.5rem;display:flex;gap:1.5rem;align-items:center;flex-wrap:wrap
}
.profile-ava{
  width:90px;height:90px;border-radius:50%;border:3px solid rgba(255,255,255,.3);
  background:linear-gradient(135deg,var(--red),var(--gold));display:flex;align-items:center;justify-content:center;
  font-size:2.2rem;font-weight:900;color:#fff;flex-shrink:0
}
.profile-info{flex:1;min-width:0}
.profile-name{font-size:1.4rem;font-weight:800;margin-bottom:.2rem}
.profile-username{font-size:.85rem;opacity:.6;margin-bottom:.5rem}
.profile-chips{display:flex;gap:.5rem;flex-wrap:wrap}
.pchip{display:inline-flex;align-items:center;gap:.3rem;background:rgba(255,255,255,.1);border-radius:var(--r50);padding:.22rem .7rem;font-size:.72rem;font-weight:600;letter-spacing:.03em}
.xp-bar-wrap{margin-top:1rem;max-width:300px}
.xp-bar-label{font-size:.72rem;opacity:.6;margin-bottom:.3rem}
.xp-bar{height:6px;background:rgba(255,255,255,.15);border-radius:3px;overflow:hidden}
.xp-bar-fill{height:100%;background:linear-gradient(90deg,var(--gold),var(--red));border-radius:3px;transition:width .8s}
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:1rem;margin-bottom:1.5rem}
.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r12);padding:1.25rem;text-align:center}
.stat-n{font-size:1.8rem;font-weight:800;line-height:1.1}
.stat-l{font-size:.75rem;color:var(--text2);margin-top:.25rem}
.ach-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:1rem}
.ach-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r12);padding:1rem;text-align:center;opacity:.4;transition:all .25s;position:relative}
.ach-card.earned{opacity:1}
.ach-card.earned.legendary{border-color:var(--gold);box-shadow:0 0 20px rgba(242,166,35,.25)}
.ach-card.earned.epic{border-color:var(--purple)}
.ach-card.earned.rare{border-color:var(--blue)}
.ach-icon{font-size:2.2rem;margin-bottom:.4rem}
.ach-name{font-size:.78rem;font-weight:700;line-height:1.3}
.ach-xp{font-size:.7rem;color:var(--gold);font-weight:700;margin-top:.2rem}
.ach-badge{position:absolute;top:.4rem;right:.4rem;font-size:.6rem;font-weight:800;padding:.1rem .35rem;border-radius:var(--r4);letter-spacing:.04em}
.rarity-legendary{background:#fef3c7;color:#92400e}
.rarity-epic{background:var(--purple-light);color:var(--purple)}
.rarity-rare{background:var(--blue-light);color:var(--blue)}
.rarity-common{background:var(--surface3);color:var(--text3)}

/* ===== HEATMAP ===== */
.heatmap-wrap{overflow-x:auto;padding:.5rem 0}
.heatmap{display:flex;gap:3px}
.hm-week{display:flex;flex-direction:column;gap:3px}
.hm-day{width:12px;height:12px;border-radius:2px;background:var(--surface3)}
.hm-day.l1{background:rgba(232,89,60,.25)}
.hm-day.l2{background:rgba(232,89,60,.5)}
.hm-day.l3{background:rgba(232,89,60,.75)}
.hm-day.l4{background:var(--red)}

/* ===== DASHBOARD STREAK ===== */
.streak-card{
  background:linear-gradient(135deg,#ff6b35,#E8593C,#c0392b);color:#fff;
  border-radius:var(--r16);padding:1.5rem;margin-bottom:1.5rem;display:flex;align-items:center;gap:1.25rem
}
.streak-fire{font-size:3.5rem;animation:fire .6s ease-in-out infinite alternate}
@keyframes fire{from{transform:scale(1)}to{transform:scale(1.08)}}
.streak-info h3{font-size:1.5rem;font-weight:800;line-height:1}
.streak-info p{opacity:.8;font-size:.85rem;margin-top:.2rem}

/* ===== DAILY CHALLENGE ===== */
.daily-card{background:linear-gradient(135deg,var(--ink2),#0f3460);color:#fff;border-radius:var(--r16);padding:1.5rem;margin-bottom:1.5rem}
.daily-header{display:flex;align-items:center;gap:.75rem;margin-bottom:1rem}
.daily-icon{font-size:2rem}
.daily-title{font-size:1.1rem;font-weight:700}
.daily-sub{font-size:.82rem;opacity:.7;margin-top:.15rem}
.daily-words{display:flex;gap:.5rem;flex-wrap:wrap;margin-bottom:1rem}
.daily-word-chip{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);border-radius:var(--r8);padding:.35rem .75rem;font-family:var(--font-zh);font-size:1.1rem;cursor:pointer;transition:all .2s}
.daily-word-chip:hover{background:rgba(255,255,255,.2)}

/* ===== SRS REVIEW ===== */
.srs-banner{
  background:linear-gradient(135deg,var(--purple-light),var(--blue-light));
  border:1px solid var(--purple);border-radius:var(--r12);padding:1rem 1.25rem;
  display:flex;align-items:center;gap:1rem;margin-bottom:1rem;cursor:pointer;transition:all .2s
}
.srs-banner:hover{box-shadow:var(--shadow-md)}

/* ===== MODALS ===== */
.overlay{position:fixed;inset:0;background:rgba(0,0,0,.55);backdrop-filter:blur(5px);z-index:200;display:none;opacity:0;transition:opacity .2s;pointer-events:none}
.overlay.open{pointer-events:auto}
.overlay.open{display:block;opacity:1}
.modal{
  position:fixed;top:50%;left:50%;transform:translate(-50%,-58%) scale(.96);
  width:min(520px,96vw);max-height:92vh;overflow-y:auto;
  background:var(--surface);border-radius:var(--r24);
  box-shadow:var(--shadow-xl);z-index:201;padding:2rem;
  display:none;opacity:0;transition:all .25s;pointer-events:none
}
.modal.open{display:block;transform:translate(-50%,-50%) scale(1);opacity:1;pointer-events:auto}
.modal-lg{width:min(680px,96vw)}
.modal-close{position:absolute;top:1.1rem;right:1.1rem;background:var(--surface3);border:none;width:32px;height:32px;border-radius:50%;font-size:.95rem;cursor:pointer;color:var(--text2);display:flex;align-items:center;justify-content:center;transition:background var(--transition)}
.modal-close:hover{background:var(--border2)}
.modal-title{font-size:1.3rem;font-weight:800;margin-bottom:1.25rem;padding-right:2.5rem}
.form-field{margin-bottom:1rem}
.form-field label{display:block;font-size:.76rem;font-weight:700;color:var(--text2);margin-bottom:.35rem;text-transform:uppercase;letter-spacing:.05em}
.form-input{width:100%;padding:.65rem 1rem;border:1.5px solid var(--border);border-radius:var(--r8);font-size:.95rem;background:var(--surface);color:var(--text);outline:none;transition:border-color var(--transition)}
.form-input:focus{border-color:var(--red)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.modal-switch{text-align:center;font-size:.83rem;color:var(--text2);margin-top:1rem}
.modal-switch a{color:var(--red);cursor:pointer;font-weight:700}
.form-err{padding:.7rem .9rem;border-radius:var(--r8);font-size:.83rem;margin-bottom:.9rem;display:none;background:var(--red-light);border:1px solid rgba(232,89,60,.3);color:var(--red)}
.form-err.show{display:block}

/* ===== PAGINATION ===== */
.pagination{display:flex;gap:.4rem;justify-content:center;padding:1.25rem 0 2rem;flex-wrap:wrap}
.pag-btn{background:var(--surface);border:1px solid var(--border);border-radius:var(--r8);padding:.38rem .75rem;cursor:pointer;font-size:.82rem;color:var(--text);transition:all .2s}
.pag-btn:hover,.pag-btn.active{background:var(--red);color:#fff;border-color:var(--red)}

/* ===== NOTIFICATIONS DROPDOWN ===== */
.notif-panel{
  position:fixed;top:calc(var(--nav-h) + .5rem);right:1rem;width:320px;max-height:400px;overflow-y:auto;
  background:var(--surface);border:1px solid var(--border);border-radius:var(--r16);
  box-shadow:var(--shadow-lg);z-index:300;display:none
}
.notif-panel.open{display:block}
.notif-header{padding:.85rem 1rem;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;font-weight:700;font-size:.875rem}
.notif-item{padding:.85rem 1rem;border-bottom:1px solid var(--border);cursor:pointer;transition:background var(--transition)}
.notif-item:hover{background:var(--surface2)}
.notif-item.unread{background:var(--blue-light)}
.notif-msg{font-size:.83rem;color:var(--text)}
.notif-time{font-size:.72rem;color:var(--text3);margin-top:.2rem}

/* ===== TOAST ===== */
.toast-wrap{position:fixed;bottom:1.5rem;right:1.5rem;z-index:1000;display:flex;flex-direction:column;gap:.5rem;pointer-events:none}
.toast{
  background:var(--ink);color:#fff;padding:.7rem 1.25rem;border-radius:var(--r50);
  font-size:.85rem;font-weight:500;pointer-events:all;
  transform:translateX(120%);opacity:0;transition:all .3s;max-width:280px;
  display:flex;align-items:center;gap:.5rem
}
.toast.show{transform:translateX(0);opacity:1}
.toast-xp{background:linear-gradient(135deg,var(--gold),#e67e22)}
.toast-achieve{background:linear-gradient(135deg,var(--purple),#5b21b6)}
.toast-err{background:linear-gradient(135deg,var(--red),var(--red2))}

/* ===== LOADING SKELETON ===== */
.skeleton{background:linear-gradient(90deg,var(--surface3) 25%,var(--border) 50%,var(--surface3) 75%);background-size:200% 100%;animation:skel 1.5s ease infinite;border-radius:var(--r8)}
@keyframes skel{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* ===== EMPTY STATE ===== */
.empty-state{text-align:center;padding:4rem 2rem;color:var(--text3)}
.empty-icon{font-size:3.5rem;margin-bottom:1rem}
.empty-title{font-size:1.1rem;font-weight:700;color:var(--text2);margin-bottom:.4rem}
.empty-sub{font-size:.875rem;line-height:1.6}

/* ===== RESPONSIVE ===== */
@media(max-width:900px){
  .nav-links{display:none}
  .hamburger{display:block}
  .nav-links.open{display:flex;flex-direction:column;position:fixed;top:var(--nav-h);left:0;right:0;background:var(--surface);border-bottom:1px solid var(--border);padding:1rem;z-index:99;gap:.15rem;box-shadow:var(--shadow-lg)}
}
@media(max-width:600px){
  .hero-stats{gap:1.25rem}
  .choices-grid{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .words-grid{grid-template-columns:repeat(auto-fill,minmax(155px,1fr))}
  .section{padding:3rem 1rem}
  .stats-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:400px){
  .words-grid{grid-template-columns:1fr 1fr}
  .hero-actions{flex-direction:column;align-items:center}
  .feat-grid{grid-template-columns:1fr 1fr}
}