/* EZ Grader Lab shared styles. One file for every page. */
:root{
  --bg:#f3f6f3; --surface:#ffffff; --surface-2:#eef2ee;
  --fg:#16233b; --muted:#5a647a; --border:#e2e8e4;
  --accent:#0e9f6e; --accent-strong:#0b7d57; --accent-ink:#ffffff;
  --good:#0e9f6e; --bad:#d8433c;
  --amber:#f2b23e;
  --shadow:0 1px 2px rgba(16,35,27,.05),0 10px 30px rgba(16,35,27,.07);
  --shadow-sm:0 1px 2px rgba(16,35,27,.06);
  --r:18px; --r-sm:12px;
  --f-disp:"Bricolage Grotesque",system-ui,sans-serif;
  --f-body:"Figtree",system-ui,sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0f1722; --surface:#16212f; --surface-2:#1d2a3a;
  --fg:#e9eef1; --muted:#9db0ba; --border:#273341;
  --accent:#2ad18f; --accent-strong:#49dca0; --accent-ink:#06130d;
  --good:#2ad18f; --bad:#ff6b63;
  --amber:#f6c25a;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 14px 36px rgba(0,0,0,.4);
  --shadow-sm:0 1px 2px rgba(0,0,0,.4);
  color-scheme:dark;
}}
:root[data-theme="dark"]{
  --bg:#0f1722; --surface:#16212f; --surface-2:#1d2a3a;
  --fg:#e9eef1; --muted:#9db0ba; --border:#273341;
  --accent:#2ad18f; --accent-strong:#49dca0; --accent-ink:#06130d;
  --good:#2ad18f; --bad:#ff6b63;
  --amber:#f6c25a;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 14px 36px rgba(0,0,0,.4);
  --shadow-sm:0 1px 2px rgba(0,0,0,.4);
  color-scheme:dark;
}

*{box-sizing:border-box}
html,body{margin:0}
body{
  background-color:var(--bg);color:var(--fg);
  background-image:radial-gradient(1100px 420px at 50% -120px,color-mix(in srgb,var(--accent) 15%,transparent),transparent 72%);
  background-repeat:no-repeat;
  font-family:var(--f-body);line-height:1.55;font-size:15px;-webkit-text-size-adjust:100%;
}
img{max-width:100%}

.wrap{max-width:760px;margin:0 auto;
  padding-left:max(18px,env(safe-area-inset-left,0px));
  padding-right:max(18px,env(safe-area-inset-right,0px));padding-bottom:52px}
.wrap.home{max-width:1060px}

/* header */
header.nav{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--surface) 86%,transparent);backdrop-filter:saturate(1.3) blur(8px);border-bottom:1px solid var(--border)}
.nav-in{max-width:1060px;margin:0 auto;display:flex;align-items:center;gap:14px;
  padding-left:max(18px,env(safe-area-inset-left,0px));
  padding-right:max(18px,env(safe-area-inset-right,0px));padding-block:12px}
.brand{font-family:var(--f-disp);font-weight:800;font-size:1.12rem;letter-spacing:-.02em;display:flex;align-items:center;gap:9px;color:var(--fg);text-decoration:none;white-space:nowrap;flex:0 0 auto}
.brand .dot{width:22px;height:22px;border-radius:7px;background:var(--accent);display:inline-grid;place-items:center;color:var(--accent-ink);flex:none;box-shadow:0 2px 8px color-mix(in srgb,var(--accent) 45%,transparent)}
.brand .dot::before{content:"";width:9px;height:5px;border-left:2.4px solid currentColor;border-bottom:2.4px solid currentColor;transform:rotate(-45deg) translateY(-1px)}
.tabs{display:flex;gap:3px;margin-left:auto;overflow-x:auto;scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.tabs a{font-weight:600;font-size:.87rem;white-space:nowrap;color:var(--muted);text-decoration:none;border-radius:9px;padding:7px 11px}
.tabs a:hover{color:var(--fg);background:var(--surface-2)}
.tabs a[aria-current="page"]{color:var(--accent-strong);background:color-mix(in srgb,var(--accent) 13%,transparent)}
.theme-btn{font:inherit;cursor:pointer;background:var(--surface-2);border:1px solid var(--border);color:var(--fg);width:36px;height:36px;border-radius:10px;flex:none;font-size:1rem}
.theme-btn:hover{border-color:var(--accent)}

h1,h2,h3{font-family:var(--f-disp);letter-spacing:-.02em;text-wrap:balance;margin:0;color:var(--fg)}
a{color:var(--accent-strong)}
.muted{color:var(--muted)}
.lede{font-size:1.06rem;color:var(--muted);max-width:56ch;margin:10px 0 0}

/* hero (home) */
.hero{padding-top:34px}
.hero h1{font-size:clamp(1.95rem,4.8vw,2.7rem);line-height:1.04}
.trust{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.trust span{font-size:.78rem;font-weight:600;color:var(--muted);background:var(--surface);border:1px solid var(--border);border-radius:999px;padding:5px 13px;box-shadow:var(--shadow-sm)}
.trust span::before{content:"✓";color:var(--accent);font-weight:800;margin-right:7px}

/* subpage head */
.tool-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 12px;margin-bottom:6px;padding-top:30px}
.tool-head h1{font-size:clamp(1.7rem,5vw,2.3rem)}
.crumb{font-weight:600;font-size:.85rem;color:var(--muted);text-decoration:none}
.crumb:hover{color:var(--accent-strong)}

/* home workbench: tool on the left, grading chart on the right */
.workbench{display:grid;grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);gap:18px;align-items:start;margin-top:24px}
.tool-col{display:flex;flex-direction:column;gap:14px;min-width:0}
.workbench .chart{margin-top:0;max-width:none;max-height:560px}
@media (max-width:860px){.workbench{grid-template-columns:1fr;gap:14px}.workbench .chart{max-height:360px}}

.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);box-shadow:var(--shadow);padding:20px}
.fields{display:flex;flex-wrap:wrap;gap:14px}
.field{display:flex;flex-direction:column;gap:6px;flex:1 1 140px;min-width:0}
.field label{font-size:.82rem;font-weight:600;color:var(--muted)}
input[type="number"],input[type="text"],select{font:inherit;font-size:1.02rem;color:var(--fg);background:var(--surface-2);border:1px solid var(--border);border-radius:11px;padding:11px 13px;width:100%}
input:focus,select:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}
.check{display:flex;align-items:center;gap:9px;margin-top:14px;font-size:.9rem;font-weight:600;color:var(--muted)}
.check input{width:18px;height:18px;accent-color:var(--accent)}

.scale-edit{margin-top:15px}
.scale-edit summary{cursor:pointer;font-size:.84rem;font-weight:700;color:var(--accent-strong);list-style:none}
.scale-edit summary::-webkit-details-marker{display:none}
.scale-edit summary::before{content:"\25B8  "}
.scale-edit[open] summary::before{content:"\25BE  "}
.scale-edit .field label{font-size:.78rem}

/* result = the grade stamp */
.result{display:flex;flex-direction:column;align-items:center;gap:8px;background:var(--surface);border:1px solid var(--border);border-radius:var(--r);box-shadow:var(--shadow);padding:24px 18px;text-align:center}
.tool-col .result{background:color-mix(in srgb,var(--accent) 6%,var(--surface));border-color:color-mix(in srgb,var(--accent) 22%,var(--border))}
.result .letter{order:-1;display:inline-grid;place-items:center;min-width:66px;height:66px;padding:0 16px;border-radius:16px;font-family:var(--f-disp);font-weight:800;font-size:2rem;line-height:1;color:var(--accent);border:2.5px solid currentColor;background:color-mix(in srgb,currentColor 13%,transparent);transform:rotate(-3deg)}
.result .letter.pass{color:var(--good)} .result .letter.fail{color:var(--bad)}
.result .big{font-family:var(--f-disp);font-weight:800;font-variant-numeric:tabular-nums;font-size:clamp(2.5rem,10vw,3.4rem);line-height:1;color:var(--fg)}
.result .big.pass{color:var(--good)} .result .big.fail{color:var(--bad)}
.result .note{font-size:.92rem;color:var(--muted);max-width:40ch;margin:0}
.copybtn{margin-top:6px;font:inherit;font-weight:700;font-size:.84rem;cursor:pointer;background:var(--surface);border:1px solid var(--border);color:var(--fg);border-radius:10px;padding:9px 18px}
.copybtn:hover{border-color:var(--accent);color:var(--accent-strong)}

/* multi-row tools */
.rows{display:flex;flex-direction:column;gap:8px;margin-top:4px}
.row{display:grid;gap:8px;align-items:center}
.row.grade-row{grid-template-columns:1fr 90px 90px 36px}
.row.gpa-row{grid-template-columns:1fr 110px 90px 36px}
.row.avg-row{grid-template-columns:1fr 36px}
.row .rm{font:inherit;cursor:pointer;background:var(--surface-2);border:1px solid var(--border);color:var(--muted);border-radius:9px;height:40px;font-size:1.1rem}
.row .rm:hover{color:var(--bad);border-color:var(--bad)}
.rowhead{font-size:.8rem;font-weight:700;color:var(--muted)}
.controls{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
button.btn{font:inherit;font-weight:700;cursor:pointer;border-radius:11px;padding:10px 17px;border:1px solid var(--border);background:var(--surface);color:var(--fg)}
button.btn:hover{border-color:var(--accent);color:var(--accent-strong)}

/* grading chart */
.chart{margin-top:16px;max-height:320px;overflow:auto;border:1px solid var(--border);border-radius:var(--r-sm);box-shadow:var(--shadow-sm)}
table{border-collapse:collapse;width:100%;font-size:.92rem}
th,td{padding:8px 14px;text-align:left;border-bottom:1px solid var(--border);font-variant-numeric:tabular-nums}
th{position:sticky;top:0;background:var(--surface-2);font-family:var(--f-body);font-weight:700;font-size:.82rem;color:var(--muted)}
tr:last-child td{border-bottom:0}

/* tool tiles */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(228px,1fr));gap:13px;margin-top:20px}
.card{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:2px 14px;text-decoration:none;background:var(--surface);border:1px solid var(--border);border-radius:var(--r);padding:16px;box-shadow:var(--shadow-sm);color:var(--fg);transition:border-color .15s,transform .15s,box-shadow .15s}
.card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:var(--shadow)}
.card .ico{grid-row:1/3;width:44px;height:44px;border-radius:12px;display:grid;place-items:center;background:color-mix(in srgb,var(--accent) 12%,transparent);color:var(--accent-strong)}
.card .ico svg{width:23px;height:23px}
.card h3{font-size:1.02rem;align-self:end}
.card .d{font-size:.88rem;color:var(--muted);align-self:start}

/* content + faq */
.content{margin-top:34px;border-top:1px solid var(--border);padding-top:26px}
.content h2{font-size:1.25rem;margin:0 0 10px}
.content h3{font-size:1.04rem;margin:20px 0 5px}
.content p{color:var(--muted);margin:0 0 7px;max-width:66ch;font-size:.97rem}
.scale{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.scale span{font-size:.84rem;font-weight:700;background:var(--surface);border:1px solid var(--border);border-radius:999px;padding:5px 13px;font-variant-numeric:tabular-nums;box-shadow:var(--shadow-sm)}
.xlink{display:inline-flex;gap:14px;flex-wrap:wrap;margin-top:14px}
.xlink a{font-size:.92rem;font-weight:700}

footer{margin-top:44px;border-top:1px solid var(--border);padding-top:18px;color:var(--muted);font-size:.86rem}
.toast{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(22px + env(safe-area-inset-bottom,0px));background:var(--fg);color:var(--bg);font-weight:700;font-size:.88rem;padding:11px 18px;border-radius:999px;box-shadow:var(--shadow);opacity:0;transition:opacity .2s;pointer-events:none;z-index:40}
.toast.show{opacity:1}
@media (prefers-reduced-motion:reduce){.card:hover{transform:none}}

.foot-links{display:flex;flex-wrap:wrap;gap:16px;margin-bottom:10px}
.foot-links a{font-weight:600;font-size:.86rem;color:var(--muted);text-decoration:none}
.foot-links a:hover{color:var(--accent-strong)}
footer p{margin:0}