/* =========================================================
   MsMa 小学英语教学工作台
   Palette: forest green / soft white / cream / gold
   ========================================================= */

:root{
  --forest-950:#08231a;
  --forest-900:#0f3528;
  --forest-800:#174a38;
  --forest-700:#23604a;
  --forest-600:#33795d;
  --sage:#a9cbb7;
  --sage-soft:#e8f1ea;
  --sage-mist:#f0f5f1;
  --cream:#f4ecd6;
  --cream-deep:#e7d6ab;
  --gold:#c79a3b;
  --gold-ink:#7d5a1c;
  --bg:#f7f8f3;
  --paper:#fffdf8;
  --ink:#1c2c23;
  --muted:#5f7168;
  --line:#dde7df;
  --line-strong:#c9d8cd;
  --danger:#a8443d;
  --ok:#237c53;
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --font-display:"Iowan Old Style","Palatino Linotype","Book Antiqua",Palatino,Georgia,"Times New Roman",serif;
  --shadow-sm:0 4px 18px rgba(15,53,40,.055);
  --shadow-md:0 16px 40px rgba(15,53,40,.09);
  --shadow-lg:0 30px 74px rgba(15,53,40,.16);
  --radius-sm:12px;
  --radius-md:18px;
  --radius-lg:26px;
  --radius-xl:34px;
  --header-h:78px;
  --ease:cubic-bezier(.2,.72,.24,1);
}

*{box-sizing:border-box}
[hidden]{display:none!important}
html{
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 22px);
  -webkit-text-size-adjust:100%;
}
body{
  margin:0;
  min-width:320px;
  color:var(--ink);
  background-color:var(--bg);
  background-image:
    radial-gradient(circle at 8% 2%, rgba(169,203,183,.20), transparent 28rem),
    radial-gradient(circle at 94% 14%, rgba(244,236,214,.65), transparent 26rem);
  background-repeat:no-repeat;
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body.is-locked{overflow:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button,input{font:inherit;color:inherit}
button{cursor:pointer}
h1,h2,h3,h4,p,dl,dd,ul,figure{margin:0}
ul{padding:0;list-style:none}
svg{display:block}
::selection{background:var(--cream-deep);color:var(--forest-950)}
:focus-visible{outline:3px solid var(--gold);outline-offset:3px}

.container{
  width:min(1180px,100% - 48px);
  margin-inline:auto;
}
.section{padding-block:clamp(58px,8vw,104px)}
.section--tight{padding-block:clamp(40px,5vw,66px)}

.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;
}
.skip-link{
  position:fixed;top:10px;left:10px;z-index:500;
  transform:translateY(-150%);
  padding:10px 16px;border-radius:999px;
  background:var(--forest-900);color:var(--paper);
  font-size:14px;box-shadow:var(--shadow-md);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:none}

/* ---------- Buttons & pills ---------- */
.btn{
  --btn-bg:var(--forest-900);
  --btn-fg:var(--paper);
  --btn-bd:transparent;
  display:inline-flex;align-items:center;justify-content:center;gap:.55rem;
  min-height:46px;padding:.7rem 1.25rem;
  border:1px solid var(--btn-bd);border-radius:999px;
  background:var(--btn-bg);color:var(--btn-fg);
  font-size:15px;font-weight:600;line-height:1.2;
  letter-spacing:.01em;white-space:nowrap;
  transition:transform .22s var(--ease),background .22s ease,box-shadow .22s ease,border-color .22s ease;
  -webkit-tap-highlight-color:transparent;
}
.btn:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(15,53,40,.18)}
.btn:active{transform:translateY(0)}
.btn svg{width:17px;height:17px;flex:none}
.btn--primary{--btn-bg:var(--forest-900)}
.btn--primary:hover{--btn-bg:var(--forest-800)}
.btn--gold{--btn-bg:var(--gold);--btn-fg:#2a1d05}
.btn--gold:hover{--btn-bg:#d3a74a}
.btn--ghost{--btn-bg:transparent;--btn-fg:var(--forest-900);--btn-bd:var(--line-strong)}
.btn--ghost:hover{--btn-bg:var(--sage-soft);--btn-bd:var(--sage)}
.btn--light{--btn-bg:var(--cream);--btn-fg:var(--forest-950)}
.btn--sm{min-height:40px;padding:.52rem .95rem;font-size:13.5px}
.btn--lg{min-height:52px;padding:.9rem 1.55rem;font-size:15.5px}

.pill{
  display:inline-flex;align-items:center;gap:.38rem;
  padding:.28rem .66rem;border-radius:999px;
  font-size:11.5px;font-weight:700;letter-spacing:.06em;line-height:1.4;
  white-space:nowrap;
}
.pill i{width:6px;height:6px;border-radius:50%;background:currentColor;flex:none}
.pill--live{background:var(--sage-soft);color:var(--forest-700);border:1px solid #cfe2d5}
.pill--gold{background:var(--cream);color:var(--gold-ink);border:1px solid var(--cream-deep)}
.pill--soon{background:#f4f1e7;color:#8a7550;border:1px solid #e7ddc6}
.pill--dark{background:rgba(255,253,248,.12);color:#f1ead9;border:1px solid rgba(255,253,248,.18)}

.eyebrow{
  display:flex;align-items:center;gap:.6rem;
  margin-bottom:1rem;
  color:var(--forest-600);
  font-size:11.5px;font-weight:700;letter-spacing:.19em;line-height:1.5;
  text-transform:uppercase;
}
.eyebrow::before{
  content:"";width:7px;height:7px;border-radius:50%;
  background:var(--gold);box-shadow:0 0 0 4px rgba(199,154,59,.14);
  flex:none;
}

.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;
  gap:32px;margin-bottom:clamp(26px,4vw,42px);
}
.section-head__copy{max-width:640px}
.section-head h2{
  font-size:clamp(1.9rem,3.4vw,2.65rem);
  line-height:1.22;letter-spacing:-.025em;
  color:var(--forest-950);font-weight:700;
}
.section-head h2 em{
  font-family:var(--font-display);font-style:italic;font-weight:600;
  color:var(--forest-700);letter-spacing:0;
}
.section-head p{
  margin-top:.65rem;color:var(--muted);font-size:15px;
}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(247,248,243,.80);
  border-bottom:1px solid transparent;
  backdrop-filter:blur(18px) saturate(1.15);
  -webkit-backdrop-filter:blur(18px) saturate(1.15);
  transition:background .24s ease,border-color .24s ease,box-shadow .24s ease;
}
.site-header.is-scrolled{
  background:rgba(250,251,247,.94);
  border-color:var(--line);
  box-shadow:0 10px 30px rgba(15,53,40,.055);
}
.header-inner{
  min-height:var(--header-h);
  display:flex;align-items:center;justify-content:space-between;gap:22px;
}
.brand{display:inline-flex;align-items:center;gap:12px;flex:none;border-radius:14px}
.brand-mark{
  width:44px;height:44px;border-radius:14px;flex:none;
  background:var(--forest-900);
  display:grid;place-items:center;
  box-shadow:0 8px 18px rgba(15,53,40,.16);
  transition:transform .25s var(--ease);
}
.brand:hover .brand-mark{transform:rotate(-5deg) scale(1.03)}
.brand-mark svg{width:27px;height:27px}
.brand-text{display:grid;gap:1px;line-height:1.15}
.brand-text strong{
  font-size:17px;font-weight:700;letter-spacing:.08em;color:var(--forest-950);
}
.brand-text small{
  font-family:var(--font-display);
  font-size:9.5px;letter-spacing:.14em;color:var(--muted);
}
.main-nav{display:flex;align-items:center;gap:4px}
.main-nav a{
  position:relative;
  padding:8px 14px;border-radius:999px;
  color:#40544a;font-size:14px;font-weight:600;
  transition:color .18s ease,background .18s ease;
}
.main-nav a:hover{color:var(--forest-900);background:var(--sage-soft)}
.main-nav a.is-active{color:var(--forest-900);background:rgba(232,241,234,.85)}
.main-nav a.is-active::after{
  content:"";position:absolute;left:50%;bottom:3px;
  width:4px;height:4px;border-radius:50%;background:var(--gold);
  transform:translateX(-50%);
}
.header-actions{display:flex;align-items:center;gap:9px;flex:none}
.fav-toggle{
  display:inline-flex;align-items:center;gap:7px;
  min-height:40px;padding:.45rem .8rem;
  border:1px solid var(--line);border-radius:999px;
  background:rgba(255,253,248,.65);color:var(--forest-800);
  font-size:13px;font-weight:600;
  transition:background .18s ease,border-color .18s ease,transform .18s ease;
}
.fav-toggle:hover{background:var(--cream);border-color:var(--cream-deep);transform:translateY(-1px)}
.fav-toggle[aria-pressed="true"]{background:var(--cream);border-color:var(--cream-deep);box-shadow:inset 0 0 0 1px rgba(199,154,59,.16)}
.fav-toggle[aria-pressed="true"] svg{fill:var(--gold)}
.fav-toggle svg{width:15px;height:15px;color:var(--gold)}
.fav-toggle .count{
  min-width:19px;height:19px;padding:0 5px;border-radius:999px;
  display:inline-grid;place-items:center;
  background:var(--forest-900);color:var(--paper);
  font-size:10.5px;font-weight:700;line-height:1;
}
.menu-toggle{
  display:none;width:44px;height:44px;border:1px solid var(--line);
  border-radius:13px;background:var(--paper);
  align-items:center;justify-content:center;
}
.menu-toggle span{position:relative;display:block;width:18px;height:2px;border-radius:2px;background:var(--forest-900);transition:transform .22s ease,opacity .22s ease}
.menu-toggle span::before,.menu-toggle span::after{
  content:"";position:absolute;left:0;width:18px;height:2px;border-radius:2px;
  background:var(--forest-900);transition:transform .22s ease,opacity .22s ease;
}
.menu-toggle span::before{top:-6px}
.menu-toggle span::after{top:6px}
.menu-toggle[aria-expanded="true"] span{transform:rotate(45deg)}
.menu-toggle[aria-expanded="true"] span::before{transform:translateY(6px) rotate(-90deg)}
.menu-toggle[aria-expanded="true"] span::after{opacity:0}

.mobile-nav{
  display:none;
  border-top:1px solid var(--line);
  background:rgba(255,253,248,.98);
  padding:12px 24px 20px;
  box-shadow:0 22px 34px rgba(15,53,40,.08);
}
.mobile-nav a{
  display:flex;align-items:center;justify-content:space-between;
  padding:13px 4px;border-bottom:1px solid var(--line);
  color:var(--forest-900);font-size:16px;font-weight:600;
}
.mobile-nav a:last-of-type{border-bottom:0}
.mobile-nav a span{color:var(--gold);font-size:18px}
.mobile-nav .btn{width:100%;margin-top:12px}
.mobile-nav.is-open{display:block;animation:panelIn .22s var(--ease)}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;
  padding-block:clamp(38px,5.5vw,76px) clamp(30px,4vw,54px);
}
.hero::before{
  content:"";position:absolute;z-index:0;pointer-events:none;
  width:520px;height:520px;right:-160px;top:-220px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(232,241,234,.9),rgba(232,241,234,0) 70%);
}
.hero-grid{
  position:relative;z-index:1;
  display:grid;grid-template-columns:minmax(0,1.03fr) minmax(0,.97fr);
  gap:clamp(24px,4.4vw,58px);align-items:center;
}
.hero-copy{padding-block:10px;min-width:0}
.hero h1{
  max-width:680px;
  color:var(--forest-950);
  font-size:clamp(2.35rem,5.05vw,4.25rem);
  line-height:1.14;letter-spacing:-.04em;font-weight:700;
}
.hero h1 .mark{
  position:relative;display:inline-block;z-index:0;
  color:var(--forest-800);
}
.hero h1 .mark::after{
  content:"";position:absolute;left:-2%;right:-2%;bottom:4%;height:.34em;z-index:-1;
  background:linear-gradient(90deg,var(--cream-deep),var(--cream));
  border-radius:999px;
  transform:rotate(-1deg);
}
.hero h1 .serif{
  font-family:var(--font-display);font-style:italic;font-weight:600;
  letter-spacing:-.01em;color:var(--forest-700);
}
.hero-lede{
  max-width:560px;margin-top:clamp(16px,2.2vw,24px);
  color:var(--muted);font-size:clamp(15.5px,1.5vw,17.5px);line-height:1.85;
}
.hero-lede strong{color:var(--forest-800);font-weight:600}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:clamp(24px,3vw,32px)}
.hero-stats{
  display:flex;align-items:stretch;gap:clamp(18px,3vw,38px);
  margin-top:clamp(28px,3.6vw,42px);
  padding-top:22px;border-top:1px solid var(--line);
  max-width:520px;
}
.hero-stats > div{display:grid;gap:2px;min-width:0}
.hero-stats dt{
  font-family:var(--font-display);
  font-size:clamp(1.75rem,3vw,2.3rem);line-height:1;font-weight:600;
  color:var(--forest-900);letter-spacing:-.02em;
}
.hero-stats dd{font-size:12px;color:var(--muted);letter-spacing:.04em;white-space:nowrap}
.hero-stats > div + div{padding-left:clamp(18px,3vw,38px);border-left:1px solid var(--line)}

.hero-stage{position:relative;min-width:0;min-height:566px;isolation:isolate}
.stage-blob{
  position:absolute;z-index:-2;inset:8% 2% 4% 4%;
  border-radius:48% 52% 55% 45%;
  background:linear-gradient(145deg,rgba(232,241,234,.95),rgba(244,236,214,.58));
  filter:blur(2px);
  transform:rotate(-4deg);
}
.stage-ring{
  position:absolute;z-index:-1;width:400px;height:400px;
  right:4%;top:8%;border:1px dashed rgba(35,96,74,.22);border-radius:50%;
  animation:spin 70s linear infinite;
}
.stage-ring::before{
  content:"";position:absolute;width:9px;height:9px;border-radius:50%;
  background:var(--gold);top:8%;left:16%;
  box-shadow:0 0 0 5px rgba(199,154,59,.14);
}
.stage-dots{
  position:absolute;z-index:-1;left:2%;bottom:10%;
  width:94px;height:94px;opacity:.55;
  background-image:radial-gradient(var(--forest-600) 1.3px,transparent 1.3px);
  background-size:13px 13px;
}
.preview-card{
  position:absolute;
  display:block;
  background:var(--paper);
  border:1px solid rgba(221,231,223,.95);
  border-radius:24px;
  box-shadow:var(--shadow-md);
  overflow:hidden;
  transition:transform .38s var(--ease),box-shadow .38s var(--ease);
}
.preview-card img{
  width:100%;height:100%;object-fit:cover;object-position:top center;
  transition:transform .7s var(--ease);
}
.preview-card:hover{box-shadow:var(--shadow-lg)}
.preview-card:hover img{transform:scale(1.035)}
.preview-card--main{
  z-index:3;left:1%;top:56px;width:min(365px,74%);min-width:0;
  transform:rotate(-2.2deg);
}
.preview-card--main:hover{transform:rotate(0) translateY(-7px)}
.preview-card__media{position:relative;min-width:0;aspect-ratio:1.52;overflow:hidden;background:var(--sage-soft)}
.preview-card__media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:top center}
.preview-card__media::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,transparent 65%,rgba(8,35,26,.10));
  pointer-events:none;
}
.preview-card__badge{position:absolute;z-index:2;left:13px;top:13px}
.preview-card__body{min-width:0;padding:16px 18px 18px}
.preview-card__body h2{
  font-size:clamp(1rem,1.35vw,1.18rem);line-height:1.4;
  color:var(--forest-950);letter-spacing:-.015em;
}
.preview-card__body p{margin-top:4px;color:var(--muted);font-size:11.5px;letter-spacing:.02em}
.preview-card__link{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  margin-top:13px;padding-top:12px;border-top:1px solid var(--line);
  color:var(--forest-700);font-size:12.5px;font-weight:700;
}
.preview-card__link .arrow{
  width:29px;height:29px;border-radius:50%;display:grid;place-items:center;
  background:var(--forest-900);color:var(--paper);
  transition:transform .25s var(--ease),background .25s ease;
}
.preview-card__link .arrow svg{width:13px;height:13px}
.preview-card:hover .preview-card__link .arrow{transform:rotate(-38deg);background:var(--forest-700)}

.preview-card--mini{
  z-index:2;background:var(--paper);padding:7px;border-radius:19px;
}
.preview-card--mini img{border-radius:13px;aspect-ratio:1.45;object-fit:cover}
.mini-card__label{
  display:flex;align-items:center;justify-content:space-between;gap:6px;
  padding:8px 5px 4px;font-size:11.5px;font-weight:700;color:var(--forest-900);
  line-height:1.35;
}
.mini-card__label em{font-style:normal;color:var(--muted);font-size:9.5px;font-weight:500;white-space:nowrap}
.preview-card--one .mini-card__label{justify-content:flex-end;gap:8px}
.preview-card--one{right:0;top:0;width:216px;transform:rotate(3.4deg)}
.preview-card--one:hover{transform:rotate(0) translateY(-6px)}
.preview-card--two{right:2%;bottom:26px;width:242px;transform:rotate(-3deg)}
.preview-card--two:hover{transform:rotate(0) translateY(-6px)}
.float-note{
  position:absolute;z-index:5;left:2%;bottom:12px;
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 16px;border-radius:999px;
  background:var(--cream);border:1px solid var(--cream-deep);
  color:#5b471f;font-size:12.5px;font-weight:600;
  box-shadow:0 12px 26px rgba(15,53,40,.10);
  transform:rotate(-2deg);
  animation:bob 5s ease-in-out infinite;
}
.float-note .spark{color:var(--gold);font-size:14px}
.stage-star{
  position:absolute;z-index:6;right:5%;top:52%;color:var(--gold);
  animation:bob 4s ease-in-out infinite reverse;
}
.stage-star svg{width:22px;height:22px}

/* ---------- Keyword strip ---------- */
.keyword-strip{
  border-block:1px solid var(--line);
  background:rgba(255,253,248,.52);
  overflow:hidden;
}
.keyword-track{
  display:flex;width:max-content;
  animation:marquee 34s linear infinite;
}
.keyword-strip:hover .keyword-track{animation-play-state:paused}
.keyword-set{display:flex;align-items:center;gap:34px;padding:15px 17px;flex:none}
.keyword-set span{
  font-family:var(--font-display);
  font-size:12px;letter-spacing:.24em;color:var(--forest-700);opacity:.72;
  white-space:nowrap;
}
.keyword-set i{width:5px;height:5px;border-radius:50%;background:var(--gold);opacity:.75;flex:none}

/* ---------- Filters ---------- */
.filter-bar{
  display:flex;flex-wrap:wrap;gap:6px;
  padding:5px;border:1px solid var(--line);border-radius:999px;
  background:rgba(255,253,248,.8);
  box-shadow:var(--shadow-sm);
}
.filter-btn{
  min-height:38px;padding:.4rem .9rem;
  border:1px solid transparent;border-radius:999px;
  background:transparent;color:#53665c;
  font-size:13px;font-weight:600;line-height:1.2;
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.filter-btn:hover{background:var(--sage-soft);color:var(--forest-900)}
.filter-btn[aria-pressed="true"]{
  background:var(--forest-900);color:var(--paper);
  box-shadow:0 6px 14px rgba(15,53,40,.16);
}
.filter-btn:active{transform:scale(.98)}

/* ---------- Grade cards ---------- */
.grade-grid{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:16px;
}
.grade-card{
  position:relative;
  display:flex;flex-direction:column;
  min-height:276px;padding:22px;
  border:1px solid var(--line);border-radius:24px;
  background:var(--paper);
  box-shadow:var(--shadow-sm);
  overflow:hidden;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s ease;
}
.grade-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md);border-color:var(--line-strong)}
.grade-card__top{display:flex;align-items:center;justify-content:space-between;gap:8px;position:relative;z-index:3}
.grade-term{color:var(--muted);font-size:11.5px;font-weight:600;letter-spacing:.04em}
.grade-label{display:flex;align-items:baseline;gap:9px;margin-top:20px;position:relative;z-index:2}
.grade-num{
  font-family:var(--font-display);
  font-size:clamp(2.7rem,4vw,3.55rem);line-height:.95;font-weight:600;
  letter-spacing:-.04em;color:var(--forest-900);
}
.grade-en{
  font-family:var(--font-display);font-size:10.5px;font-style:italic;
  color:var(--muted);letter-spacing:.03em;
}
.grade-card__body{margin-top:14px;position:relative;z-index:2;flex:1}
.grade-card__empty{
  display:flex;align-items:center;gap:8px;
  margin-top:3px;padding:12px 13px;
  border:1px dashed var(--line-strong);border-radius:13px;
  color:var(--muted);font-size:12px;line-height:1.5;
  background:rgba(240,245,241,.55);
}
.grade-card__empty svg{width:15px;height:15px;flex:none;color:var(--forest-600)}
.grade-links{margin-top:-2px}
.grade-links li + li{border-top:1px solid rgba(255,253,248,.14)}
.grade-links a{
  display:flex;align-items:center;justify-content:space-between;gap:8px;
  padding:8px 0;color:#e9f0e9;font-size:12.5px;line-height:1.45;
  transition:color .18s ease,padding-left .18s ease;
}
.grade-links a:hover{color:#fff;padding-left:3px}
.grade-links a span{color:var(--gold);font-size:13px;flex:none}
.grade-card__foot{
  position:relative;z-index:2;
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  margin-top:auto;padding-top:16px;
  color:var(--muted);font-size:11px;
}
.round-arrow{
  width:31px;height:31px;border-radius:50%;display:grid;place-items:center;
  border:1px solid var(--line-strong);color:var(--forest-800);
  transition:background .22s ease,color .22s ease,transform .22s var(--ease);
}
.round-arrow svg{width:14px;height:14px}
.grade-card:hover .round-arrow{background:var(--forest-900);color:var(--paper);transform:rotate(-38deg)}

.grade-card--active{
  color:#f6f1e5;
  border-color:transparent;
  background:
    radial-gradient(circle at 92% 8%,rgba(199,154,59,.22),transparent 10rem),
    radial-gradient(circle at 6% 96%,rgba(169,203,183,.14),transparent 11rem),
    linear-gradient(155deg,var(--forest-800),var(--forest-950));
  box-shadow:0 22px 46px rgba(15,53,40,.20);
}
.grade-card--active::after{
  content:"";position:absolute;right:-38px;top:-44px;
  width:150px;height:150px;border-radius:50%;
  border:1px solid rgba(246,241,229,.14);
  pointer-events:none;
}
.grade-card--active .grade-term{color:#b8cfc0}
.grade-card--active .grade-num{color:#fffdf8}
.grade-card--active .grade-en{color:#a9cbb7}
.grade-card--active .grade-card__foot{color:#b8cfc0}
.grade-card--active .round-arrow{border-color:rgba(246,241,229,.28);color:#f6f1e5}
.grade-card--active:hover .round-arrow{background:var(--cream);color:var(--forest-950)}
.grade-card__overlay{
  position:absolute;inset:0;z-index:1;border-radius:inherit;
}
.grade-card__overlay:focus-visible{outline:3px solid var(--gold);outline-offset:-4px}
.grade-card--active .grade-links a,
.grade-card--active .grade-card__foot,
.grade-card--active .grade-label{position:relative;z-index:2}
.grade-card--active .grade-card__top{z-index:3}
/* 卡片主体点击进入 Unit 4；内部资源链接保持独立可点 */
.grade-card--active .grade-card__top,
.grade-card--active .grade-label,
.grade-card--active .grade-card__body,
.grade-card--active .grade-card__foot{pointer-events:none}
.grade-card--active .grade-links a{pointer-events:auto}
.grade-card__hint{
  position:absolute;right:20px;bottom:19px;z-index:2;
  color:#a9cbb7;font-size:11px;
}
.grade-card--soon{color:var(--ink)}
.grade-card--soon .grade-num{color:var(--forest-800)}
.grade-card--soon:hover .grade-num{color:var(--forest-700)}
.grade-card--soon .round-arrow{margin-left:auto}

/* ---------- Resources ---------- */
.resources{
  background:linear-gradient(180deg,#eef5ef 0%,#f4f7f2 55%,var(--bg) 100%);
  border-block:1px solid var(--line);
}
.resource-toolbar{
  display:flex;align-items:center;flex-wrap:wrap;gap:10px;
  margin-bottom:22px;
}
.search-box{
  position:relative;flex:1 1 280px;max-width:390px;
}
.search-box svg{
  position:absolute;left:16px;top:50%;transform:translateY(-50%);
  width:17px;height:17px;color:var(--muted);pointer-events:none;
}
.search-box input{
  width:100%;height:46px;
  padding:0 42px 0 43px;
  border:1px solid var(--line-strong);border-radius:999px;
  background:var(--paper);color:var(--ink);
  font-size:14px;
  transition:border-color .18s ease,box-shadow .18s ease,background .18s ease;
  appearance:none;
}
.search-box input::placeholder{color:#8a9a90}
.search-box input:focus{
  outline:none;border-color:var(--forest-600);background:#fff;
  box-shadow:0 0 0 4px rgba(51,121,93,.12);
}
.search-box .clear-search{
  position:absolute;right:8px;top:50%;transform:translateY(-50%);
  width:30px;height:30px;border:0;border-radius:50%;
  background:var(--sage-soft);color:var(--forest-800);
  display:none;place-items:center;
}
.search-box .clear-search svg{position:static;width:13px;height:13px;transform:none;color:currentColor}
.search-box.has-value .clear-search{display:grid}
.type-filters{display:flex;flex-wrap:wrap;gap:6px}
.chip{
  min-height:38px;padding:.4rem .86rem;
  border:1px solid var(--line);border-radius:999px;
  background:rgba(255,253,248,.74);color:#53665c;
  font-size:12.5px;font-weight:600;line-height:1.2;
  display:inline-flex;align-items:center;gap:6px;
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.chip:hover{background:var(--cream);border-color:var(--cream-deep)}
.chip[aria-pressed="true"]{
  background:var(--forest-900);border-color:var(--forest-900);color:var(--paper);
}
.chip--fav svg{width:14px;height:14px;color:var(--gold)}
.chip--fav[aria-pressed="true"] svg{color:var(--cream-deep)}
.chip .chip-count{
  min-width:17px;height:17px;padding:0 4px;border-radius:999px;
  display:inline-grid;place-items:center;
  background:var(--sage-soft);color:var(--forest-800);
  font-size:10px;font-weight:700;line-height:1;
}
.chip[aria-pressed="true"] .chip-count{background:rgba(255,253,248,.16);color:var(--paper)}
.resource-meta-line{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  margin-bottom:14px;color:var(--muted);font-size:11.5px;
}
.resource-meta-line strong{color:var(--forest-800);font-weight:700}
.resource-grid{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:18px;
}
.resource-card{
  position:relative;
  display:flex;flex-direction:column;
  border:1px solid var(--line);border-radius:22px;
  background:var(--paper);
  box-shadow:var(--shadow-sm);
  overflow:hidden;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s ease,opacity .3s ease;
}
.resource-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md);border-color:var(--line-strong)}
.resource-card.is-filtered{display:none}
.resource-card__media{
  position:relative;aspect-ratio:1.66;overflow:hidden;
  background:var(--sage-soft);
}
.resource-card__media > a{display:block;width:100%;height:100%}
.resource-card__media img{
  width:100%;height:100%;object-fit:cover;object-position:top center;
  transition:transform .6s var(--ease);
}
.resource-card:hover .resource-card__media img{transform:scale(1.035)}
.resource-card__media::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(8,35,26,.06),transparent 45%);
  pointer-events:none;
}
.resource-card__type{position:absolute;left:13px;top:13px;z-index:2}
.fav-btn{
  position:absolute;right:12px;top:12px;z-index:3;
  width:38px;height:38px;border-radius:50%;
  border:1px solid rgba(255,253,248,.7);
  background:rgba(255,253,248,.9);
  color:#7c8c82;
  display:grid;place-items:center;
  box-shadow:0 4px 12px rgba(15,53,40,.12);
  backdrop-filter:blur(6px);
  transition:background .18s ease,color .18s ease,transform .18s var(--ease);
}
.fav-btn svg{width:17px;height:17px}
.fav-btn:hover{transform:scale(1.08);color:var(--gold-ink);background:#fff}
.fav-btn[aria-pressed="true"]{background:var(--cream);border-color:var(--cream-deep);color:var(--gold-ink)}
.fav-btn[aria-pressed="true"] svg{fill:var(--gold)}
.fav-btn.is-pop{animation:pop .35s var(--ease)}
.resource-card__body{display:flex;flex-direction:column;flex:1;padding:18px 19px 17px}
.resource-card__kicker{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  color:var(--muted);font-size:10.5px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;
}
.resource-card__kicker span:last-child{letter-spacing:0;text-transform:none;font-weight:500}
.resource-card h3{
  margin-top:7px;font-size:19px;line-height:1.4;letter-spacing:-.015em;
  color:var(--forest-950);
}
.resource-card h3 a{transition:color .18s ease}
.resource-card h3 a:hover{color:var(--forest-600)}
.resource-card__desc{
  margin-top:6px;color:var(--muted);font-size:13px;line-height:1.7;
}
.resource-tags{display:flex;flex-wrap:wrap;gap:5px;margin-top:12px}
.resource-tags span{
  padding:.18rem .55rem;border-radius:999px;
  background:var(--sage-mist);border:1px solid var(--line);
  color:#53665c;font-size:10px;font-weight:600;line-height:1.6;
}
.resource-card__foot{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  margin-top:15px;padding-top:14px;border-top:1px solid var(--line);
}
.resource-card__cta{
  display:inline-flex;align-items:center;gap:6px;
  color:var(--forest-800);font-size:12.5px;font-weight:700;
}
.resource-card__cta svg{width:14px;height:14px;transition:transform .22s var(--ease)}
.resource-card__cta:hover svg{transform:translateX(3px)}
.resource-card__grade{
  font-family:var(--font-display);font-size:13px;font-style:italic;
  color:var(--gold-ink);
}
.empty-state{
  padding:clamp(32px,6vw,58px) 24px;
  text-align:center;
  border:1px dashed var(--line-strong);border-radius:24px;
  background:rgba(255,253,248,.6);
}
.empty-state__icon{
  width:56px;height:56px;margin:0 auto 14px;
  border-radius:50%;display:grid;place-items:center;
  background:var(--cream);color:var(--gold-ink);
}
.empty-state__icon svg{width:24px;height:24px}
.empty-state h3{font-size:18px;color:var(--forest-950)}
.empty-state p{margin-top:6px;color:var(--muted);font-size:13.5px}
.empty-state .btn{margin-top:18px}

/* ---------- About ---------- */
.about-card{
  position:relative;overflow:hidden;
  display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);
  gap:clamp(28px,5vw,64px);
  padding:clamp(28px,5vw,58px);
  border-radius:var(--radius-xl);
  background:
    radial-gradient(circle at 95% 0%,rgba(199,154,59,.18),transparent 18rem),
    radial-gradient(circle at 0% 100%,rgba(169,203,183,.15),transparent 20rem),
    linear-gradient(145deg,var(--forest-800),var(--forest-950));
  color:#f6f1e5;
  box-shadow:0 28px 60px rgba(15,53,40,.18);
}
.about-card::before{
  content:"";position:absolute;right:-50px;bottom:-80px;
  width:280px;height:280px;border-radius:50%;
  border:1px solid rgba(246,241,229,.10);
  pointer-events:none;
}
.about-card .eyebrow{color:#b8cfc0}
.about-card .eyebrow::before{background:var(--gold);box-shadow:0 0 0 4px rgba(199,154,59,.18)}
.about-copy h2{
  max-width:560px;
  font-size:clamp(1.7rem,3vw,2.45rem);line-height:1.35;letter-spacing:-.02em;
  color:#fffdf8;
}
.about-copy h2 em{font-family:var(--font-display);font-style:italic;color:var(--cream-deep)}
.about-quote{
  max-width:520px;margin-top:18px;
  color:#c5d7ca;font-size:14.5px;line-height:1.9;
}
.about-sign{
  display:flex;align-items:center;gap:10px;margin-top:24px;
  color:#a9cbb7;font-size:12px;letter-spacing:.04em;
}
.about-sign .line{width:36px;height:1px;background:rgba(246,241,229,.3)}
.about-features{display:grid;gap:10px;align-content:center}
.feature{
  display:flex;align-items:flex-start;gap:13px;
  padding:14px 15px;border-radius:16px;
  background:rgba(255,253,248,.065);
  border:1px solid rgba(255,253,248,.11);
  transition:background .2s ease,transform .2s var(--ease);
}
.feature:hover{background:rgba(255,253,248,.10);transform:translateX(3px)}
.feature__icon{
  width:36px;height:36px;border-radius:11px;flex:none;
  display:grid;place-items:center;
  background:rgba(244,236,214,.14);color:var(--cream);
}
.feature__icon svg{width:18px;height:18px}
.feature h3{font-size:13.5px;color:#fffdf8;font-weight:700}
.feature p{margin-top:2px;color:#b8cfc0;font-size:11.5px;line-height:1.6}

/* ---------- Footer ---------- */
.site-footer{
  border-top:1px solid var(--line);
  background:rgba(255,253,248,.62);
  padding-block:48px 24px;
}
.footer-grid{
  display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,.8fr) minmax(0,.8fr);
  gap:36px;
}
.footer-brand .brand{margin-bottom:12px}
.footer-brand p{max-width:340px;color:var(--muted);font-size:12.5px;line-height:1.8}
.footer-col h3{
  margin-bottom:13px;color:var(--forest-900);
  font-size:11px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;
}
.footer-col ul{display:grid;gap:8px}
.footer-col a{
  color:#52655b;font-size:12.5px;
  transition:color .18s ease,padding-left .18s ease;
}
.footer-col a:hover{color:var(--forest-900);padding-left:3px}
.footer-col--grades ul{grid-template-columns:repeat(2,minmax(0,1fr))}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  margin-top:38px;padding-top:18px;border-top:1px solid var(--line);
  color:#7c8c82;font-size:11px;
}
.footer-bottom .made{font-family:var(--font-display);font-style:italic;letter-spacing:.02em}

/* ---------- To top / toast ---------- */
.to-top{
  position:fixed;right:22px;bottom:22px;z-index:90;
  width:46px;height:46px;border-radius:50%;
  border:1px solid rgba(255,253,248,.2);
  background:var(--forest-900);color:var(--paper);
  display:grid;place-items:center;
  box-shadow:0 12px 28px rgba(15,53,40,.24);
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .22s ease,visibility .22s ease,transform .22s var(--ease),background .22s ease;
}
.to-top.is-visible{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--forest-700);transform:translateY(-3px)}
.to-top svg{width:18px;height:18px}
.toast{
  position:fixed;left:50%;bottom:28px;z-index:400;
  transform:translate(-50%,18px);
  max-width:min(90vw,420px);
  display:flex;align-items:center;gap:9px;
  padding:11px 18px;border-radius:999px;
  background:var(--forest-950);color:#f6f1e5;
  border:1px solid rgba(199,154,59,.4);
  box-shadow:0 16px 40px rgba(8,35,26,.3);
  font-size:13px;line-height:1.45;
  opacity:0;visibility:hidden;pointer-events:none;
  transition:opacity .22s ease,visibility .22s ease,transform .22s var(--ease);
}
.toast.is-visible{opacity:1;visibility:visible;transform:translate(-50%,0)}
.toast svg{width:16px;height:16px;color:var(--gold);flex:none}

/* ---------- Reveal ---------- */
.js .reveal{
  opacity:0;transform:translateY(20px);
  transition:opacity .72s var(--ease),transform .72s var(--ease);
  transition-delay:var(--delay,0s);
}
.js .reveal.is-visible{opacity:1;transform:none}
.js .reveal--left{transform:translateX(-22px)}
.js .reveal--right{transform:translateX(22px)}
.js .reveal--left.is-visible,.js .reveal--right.is-visible{transform:none}

/* ---------- Motion ---------- */
@keyframes panelIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes bob{0%,100%{transform:rotate(-2deg) translateY(0)}50%{transform:rotate(-1deg) translateY(-7px)}}
@keyframes marquee{from{transform:translateX(0)}to{transform:translateX(-50%)}}
@keyframes pop{0%{transform:scale(1)}45%{transform:scale(1.22)}100%{transform:scale(1)}}

/* ---------- Responsive ---------- */
@media (max-width:1100px){
  .grade-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grade-card{min-height:250px}
  .section-head{flex-direction:column;align-items:flex-start;gap:18px}
  .filter-bar{width:100%;overflow-x:auto;flex-wrap:nowrap;scrollbar-width:none}
  .filter-bar::-webkit-scrollbar{display:none}
  .filter-btn{flex:none}
  .hero-stage{min-height:500px}
  .preview-card--main{width:min(290px,70%)}
  .preview-card--one{width:170px;right:-10px}
  .preview-card--two{width:190px;right:-8px}
}
@media (max-width:980px){
  :root{--header-h:70px}
  .main-nav{display:none}
  .menu-toggle{display:inline-flex}
  .mobile-nav{display:none}
  .hero-grid{grid-template-columns:1fr;gap:26px}
  .hero-copy{padding-block:0;max-width:720px}
  .hero-stage{width:min(100%,610px);margin-inline:auto;min-height:536px}
  .hero h1{font-size:clamp(2.3rem,6.8vw,3.6rem)}
  .preview-card--main{width:min(340px,68%)}
  .preview-card--one{width:185px}
  .preview-card--two{width:210px}
  .about-card{grid-template-columns:1fr}
  .resources .section-head{margin-bottom:22px}
}
@media (max-width:860px){
  .resource-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media (max-width:720px){
  .container{width:calc(100% - 36px)}
  .header-actions .header-cta{display:none}
  .fav-toggle span.label{display:none}
  .fav-toggle{padding-inline:.65rem}
  .hero{padding-top:26px}
  .hero-stage{
    display:grid;grid-template-columns:1fr 1fr;gap:12px;
    min-height:0;max-width:560px;width:100%;
  }
  .stage-blob,.stage-ring,.stage-dots,.float-note,.stage-star{display:none}
  .preview-card--main{
    position:static;grid-column:1/-1;width:auto;transform:none;
    display:grid;grid-template-columns:1.05fr .95fr;
  }
  .preview-card--main:hover{transform:translateY(-5px)}
  .preview-card--main .preview-card__media{aspect-ratio:auto;height:auto;min-height:180px;align-self:stretch}
  .preview-card--main .preview-card__body{display:flex;flex-direction:column;justify-content:center}
  .preview-card--mini{position:static;width:auto;transform:none;padding:6px}
  .preview-card--mini:hover{transform:translateY(-4px)}
  .preview-card--mini img{aspect-ratio:1.6}
  .mini-card__label{font-size:10.5px;padding:7px 3px 3px}
  .mini-card__label em{display:none}
  .hero-stats{max-width:none}
  .grade-grid{grid-template-columns:1fr}
  .grade-card{min-height:0}
  .grade-card--active{min-height:260px}
  .grade-card--soon{min-height:190px}
  .resource-toolbar{align-items:stretch}
  .search-box{max-width:none;flex-basis:100%}
  .type-filters{overflow-x:auto;flex-wrap:nowrap;padding-bottom:2px;scrollbar-width:none}
  .type-filters::-webkit-scrollbar{display:none}
  .type-filters .chip{flex:none}
  .resource-grid{grid-template-columns:1fr}
  .resource-meta-line{align-items:flex-start;flex-direction:column;gap:4px}
  .about-card{padding:26px 22px;border-radius:24px}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .footer-brand{grid-column:auto}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:6px}
  .toast{bottom:78px;width:max-content;max-width:calc(100vw - 32px)}
  .to-top{right:14px;bottom:14px;width:42px;height:42px}
}
@media (max-width:520px){
  .brand-mark{width:39px;height:39px;border-radius:12px}
  .brand-mark svg{width:24px;height:24px}
  .brand-text strong{font-size:15px}
  .brand-text small{font-size:8px}
  .header-actions{gap:6px}
  .hero h1{font-size:clamp(2rem,9.6vw,2.65rem);line-height:1.18}
  .hero .eyebrow{font-size:10px;letter-spacing:.12em;gap:.45rem}
  .hero .eyebrow::before{width:6px;height:6px}
  .hero-lede{font-size:14.5px}
  .hero-cta .btn{flex:1 1 auto}
  .hero-stats{gap:14px}
  .hero-stats > div + div{padding-left:14px}
  .hero-stats dt{font-size:1.7rem}
  .hero-stats dd{font-size:10.5px}
  .preview-card--main{display:block}
  .preview-card--main .preview-card__media{aspect-ratio:1.55;height:auto;min-height:0}
  .preview-card--main .preview-card__body{display:block}
  .preview-card--mini img{aspect-ratio:1.5}
  .mini-card__label{font-size:9.5px;line-height:1.35}
  .keyword-set{gap:22px;padding-block:12px}
  .keyword-set span{font-size:10px}
  .grade-card{padding:19px}
  .section-head h2{font-size:1.8rem}
  .about-copy h2{font-size:1.55rem}
  .about-quote{font-size:13px}
  .footer-bottom{font-size:10px}
}

@media (max-width:380px){
  .header-inner{gap:12px}
  .header-actions{gap:4px}
  .fav-toggle{padding-inline:.55rem}
  .brand-text strong{font-size:14.5px}
  .brand-text small{font-size:8px;letter-spacing:.08em}
}

/* ---------- Reduced motion / print ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  .js .reveal{opacity:1;transform:none}
}
@media print{
  .site-header,.to-top,.toast,.keyword-strip,.hero-stage{display:none!important}
  body{background:#fff}
  .hero{padding-block:20px}
  .section{padding-block:24px}
  .about-card{box-shadow:none}
}