/* KIIT CGPA Calculator — static site styles */
*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0}
:root{
  --maroon:#5b1a20;--maroon-2:#7a2530;--gold:#d9a441;--gold-2:#f0c674;
  --bg:#fdfbf7;--fg:#1f1416;--muted:#6b5a5c;--card:#ffffff;--border:#e8dfd8;
  --secondary:#f5ede2;
}
body{
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);color:var(--fg);line-height:1.55;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:1100px;margin:0 auto;padding:0 16px}

/* Header */
header.site{background:var(--maroon);color:#fff;position:sticky;top:0;z-index:20;box-shadow:0 1px 3px rgba(0,0,0,.1)}
header.site .row{display:flex;justify-content:space-between;align-items:center;padding:14px 16px;max-width:1100px;margin:0 auto}
.brand{display:flex;align-items:center;gap:10px;font-weight:700}
.brand .logo{width:36px;height:36px;border-radius:8px;background:var(--gold);color:var(--maroon);display:grid;place-items:center;font-weight:800}
.brand .name{font-size:1.05rem}
.brand .name span{color:var(--gold)}
nav.main{display:none;gap:22px;font-size:.92rem;font-weight:500}
nav.main a:hover,nav.main a.active{color:var(--gold)}
@media(min-width:640px){nav.main{display:flex}}

/* Hero */
.hero{background:linear-gradient(180deg,var(--secondary),var(--bg));border-bottom:1px solid var(--border)}
.hero .grid{display:grid;gap:32px;padding:56px 16px;max-width:1100px;margin:0 auto}
@media(min-width:768px){.hero .grid{grid-template-columns:1fr 1fr;align-items:center}}
.pill{display:inline-flex;align-items:center;gap:6px;background:rgba(217,164,65,.15);border:1px solid rgba(217,164,65,.4);color:var(--maroon);font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;padding:4px 12px;border-radius:999px}
h1{color:var(--maroon);font-size:2.2rem;margin:14px 0 10px;line-height:1.15}
@media(min-width:640px){h1{font-size:2.75rem}}
.hero p.lead{color:var(--muted);font-size:1.05rem;margin:0}
.hero .imgwrap{border-radius:16px;overflow:hidden;border:1px solid var(--border);box-shadow:0 10px 25px rgba(0,0,0,.08);max-width:520px;margin:0 auto;aspect-ratio:4/3}
.hero .imgwrap img{display:block;width:100%;height:100%;object-fit:cover}

/* Sections */
section{padding:48px 0}
section.alt{background:rgba(245,237,226,.5);border-top:1px solid var(--border)}
h2{color:var(--maroon);font-size:1.7rem;margin:0 0 8px}
h3{color:var(--maroon);font-size:1.35rem;margin:24px 0 8px}

/* Cards */
.cards{display:grid;gap:18px}
@media(min-width:640px){.cards.c3{grid-template-columns:repeat(3,1fr)}}
.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:20px;box-shadow:0 1px 2px rgba(0,0,0,.03)}

/* Calculator */
.tabs{display:inline-flex;background:var(--card);border:1px solid var(--border);border-radius:10px;padding:4px;margin-bottom:18px}
.tabs button{background:transparent;border:0;padding:9px 20px;font-weight:600;font-size:.92rem;border-radius:7px;cursor:pointer;color:var(--fg)}
.tabs button.active{background:var(--maroon);color:#fff}
.table-wrap{background:var(--card);border:1px solid var(--border);border-radius:12px;overflow:hidden;box-shadow:0 1px 2px rgba(0,0,0,.03)}
.head-row,.data-row{display:grid;grid-template-columns:2fr 1.2fr 1.2fr 40px;gap:8px;align-items:center;padding:12px 14px}
.head-row{background:var(--secondary);font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--maroon);border-bottom:1px solid var(--border)}
.data-row{border-bottom:1px solid var(--border)}
.data-row:last-child{border-bottom:0}
input[type=text],input[type=number],select{width:100%;padding:8px 10px;border:1px solid var(--border);border-radius:7px;background:#fff;font-size:.9rem;font-family:inherit;color:var(--fg)}
input:focus,select:focus{outline:2px solid var(--gold);outline-offset:1px}
.btn{display:inline-flex;align-items:center;gap:6px;padding:9px 16px;border-radius:8px;font-weight:600;font-size:.9rem;border:0;cursor:pointer;font-family:inherit}
.btn-primary{background:var(--maroon);color:#fff}
.btn-primary:hover{background:var(--maroon-2)}
.btn-ghost{background:#fff;color:var(--fg);border:1px solid var(--border)}
.btn-ghost:hover{background:var(--secondary)}
.btn-icon{background:transparent;border:0;color:var(--muted);cursor:pointer;padding:6px;border-radius:6px}
.btn-icon:hover{background:rgba(220,38,38,.1);color:#dc2626}
.actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.results{display:grid;gap:14px;margin-top:18px}
@media(min-width:640px){.results{grid-template-columns:repeat(3,1fr)}}
.result{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:20px}
.result .lbl{font-size:.7rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:600}
.result .val{font-size:2.2rem;font-weight:800;color:var(--maroon);margin-top:4px}
.result .sub{font-size:.78rem;color:var(--muted);margin-top:2px}

/* Tables */
table.data{width:100%;border-collapse:collapse;font-size:.9rem}
table.data thead{background:var(--maroon);color:#fff}
table.data th,table.data td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--border)}
table.data tbody tr:last-child td{border-bottom:0}
table.data td.g{color:var(--maroon);font-weight:700}

/* Article prose */
.prose{max-width:800px;margin:0 auto}
.prose p{color:#2f2124;margin:12px 0}
.prose ul,.prose ol{padding-left:22px;color:#2f2124}
.prose li{margin:6px 0}
.formula{background:rgba(217,164,65,.12);border:1px solid rgba(217,164,65,.4);border-radius:10px;padding:14px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.92rem;margin:12px 0}

/* FAQ */
details.faq{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:18px;margin-bottom:12px}
details.faq[open]{border-color:var(--gold)}
details.faq summary{cursor:pointer;font-weight:600;list-style:none}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::before{content:"Q. ";color:var(--gold);font-weight:800}
details.faq p{color:var(--muted);font-size:.92rem;margin:12px 0 0}

/* Footer */
footer.site{background:var(--maroon);color:rgba(255,255,255,.85);border-top:1px solid var(--border);margin-top:40px}
footer.site .grid{display:grid;gap:24px;padding:36px 16px;max-width:1100px;margin:0 auto}
@media(min-width:640px){footer.site .grid{grid-template-columns:repeat(3,1fr)}}
footer.site h4{color:var(--gold);margin:0 0 10px;font-size:1rem}
footer.site ul{list-style:none;padding:0;margin:0;font-size:.9rem}
footer.site ul li{margin:4px 0}
footer.site a:hover{color:var(--gold)}
footer.site .copy{border-top:1px solid rgba(255,255,255,.1);padding:14px;text-align:center;font-size:.78rem;color:rgba(255,255,255,.6)}
.muted{color:var(--muted)}
strong{color:var(--fg)}