/*
Theme Name: QuickGrade
Theme URI: https://example.com/quickgrade
Author: QuickGrade
Author URI: https://example.com
Description: A fast, lightweight grade-calculator theme — Easy Grader landing page, grading-scale reference, calculator hub, and blog. Five built-in color schemes (Pine, Navy, Charcoal, Indigo, Sky) selectable in the Customizer and a live switcher. No page builder, no heavy frameworks.
Version: 1.0.0
Requires at least: 5.8
Tested up to: 6.6
Requires PHP: 7.2
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: quickgrade
Tags: education, one-column, custom-menu, custom-colors, blog, translation-ready
*/

/* ===== THEME COLOR SCHEMES ===== */
:root,[data-theme="pine"]{--ink:#15302A;--body:#3C534C;--muted:#566964;--brand:#146A50;--brand-dark:#0E5440;--accent:#146A50;--paper:#F4F7F5;--surface:#FFFFFF;--tint:#E7F1EC;--tint2:#EEF4F0;--line:#E0E8E3;--banner:#15302A;--hi:#9FE0C2;}
[data-theme="navy"]{--ink:#16243D;--body:#3A4660;--muted:#5C667C;--brand:#1E3254;--brand-dark:#142542;--accent:#9A6413;--paper:#F5F6F1;--surface:#FFFFFF;--tint:#F3ECDD;--tint2:#F6F1E6;--line:#E4E6DF;--banner:#16243D;--hi:#E7B964;}
[data-theme="charcoal"]{--ink:#1C2224;--body:#3C4648;--muted:#5B6568;--brand:#0E7C86;--brand-dark:#0A5B63;--accent:#0E7C86;--paper:#F3F6F6;--surface:#FFFFFF;--tint:#E4F1F2;--tint2:#EDF4F4;--line:#E1E7E7;--banner:#1C2224;--hi:#7FD3D9;}
[data-theme="indigo"]{--ink:#232653;--body:#404368;--muted:#5F6384;--brand:#2A2E63;--brand-dark:#1D2049;--accent:#B23A26;--paper:#F6F5FA;--surface:#FFFFFF;--tint:#ECECF7;--tint2:#F1F1F9;--line:#E6E5F0;--banner:#232653;--hi:#F0A086;}
[data-theme="sky"]{--ink:#122236;--body:#374A60;--muted:#586A80;--brand:#1F5FA8;--brand-dark:#164880;--accent:#1F5FA8;--paper:#F2F6FA;--surface:#FFFFFF;--tint:#E6EFF8;--tint2:#EEF4FB;--line:#DFE8F0;--banner:#122236;--hi:#8FC0EE;}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{margin:0;font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--body);background:var(--paper);line-height:1.6;font-size:16px;-webkit-font-smoothing:antialiased;}
h1,h2,h3,h4{font-family:'Source Serif 4',Georgia,serif;color:var(--ink);margin:0;line-height:1.2;font-weight:600;}
a{color:var(--brand);text-decoration:none;}
a:hover{color:var(--brand-dark);text-decoration:underline;}
img{max-width:100%;height:auto;}
.wrap{max-width:1040px;margin:0 auto;padding:0 24px;}
.narrow{max-width:760px;margin:0 auto;padding:0 24px;}
.eyebrow{font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin:0 0 14px;}
.center{text-align:center;}
.lead{color:var(--muted);}
.skip-link{position:absolute;left:-9999px;}
.skip-link:focus{left:8px;top:8px;background:#fff;padding:8px 12px;border-radius:6px;z-index:100;}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-size:15px;font-weight:600;padding:13px 24px;border-radius:9px;border:1px solid transparent;cursor:pointer;min-height:46px;font-family:inherit;text-decoration:none;}
.btn:hover{text-decoration:none;}
.btn-primary{background:var(--brand);color:#fff;}
.btn-primary:hover{background:var(--brand-dark);color:#fff;}
.btn-secondary{background:var(--surface);color:var(--ink);border-color:var(--line);}
.btn-secondary:hover{border-color:var(--brand);color:var(--brand-dark);}
.btn-sm{padding:10px 18px;font-size:14px;min-height:40px;}

/* header */
.site-head{position:sticky;top:0;z-index:40;background:var(--surface);border-bottom:1px solid var(--line);}
.head-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:66px;flex-wrap:wrap;padding:10px 0;}
.brand{font-family:'Source Serif 4',serif;font-weight:600;font-size:22px;font-style:italic;color:var(--ink);text-decoration:none;}
.brand span{color:var(--accent);font-style:normal;}
.brand:hover{text-decoration:none;}
.main-nav ul{list-style:none;display:flex;gap:20px;align-items:center;flex-wrap:wrap;margin:0;padding:0;}
.main-nav a{font-size:14.5px;font-weight:500;color:var(--body);}
.main-nav a:hover{color:var(--brand);text-decoration:none;}
.main-nav .current-menu-item>a{color:var(--brand);font-weight:600;}
.head-tools{display:flex;align-items:center;gap:10px;}
.head-tools select{font-family:inherit;font-size:13px;color:var(--ink);background:var(--tint2);border:1px solid var(--line);border-radius:8px;padding:7px 10px;cursor:pointer;}

/* sheet / sections */
.sheet{max-width:1000px;margin:40px auto;background:var(--surface);border:1px solid var(--line);border-radius:18px;}
.sheet .inner{padding:40px 48px;}
.section{padding:52px 0;}
.section h2{font-size:30px;margin-bottom:14px;}
.band{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}

.hero{padding:60px 0 34px;text-align:center;}
.hero h1{font-size:60px;margin:0 0 20px;letter-spacing:-.5px;}
.hero p{font-size:18px;color:var(--muted);margin:0 auto 30px;max-width:620px;}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;}

/* calculator */
.calc{max-width:540px;margin:0 auto 40px;background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:30px 30px 26px;box-shadow:0 10px 30px -18px rgba(0,0,0,.22);}
.calc h2{font-size:22px;text-align:center;margin-bottom:22px;}
.calc-row{display:flex;gap:14px;justify-content:center;align-items:flex-end;margin-bottom:16px;flex-wrap:wrap;}
.field{display:flex;flex-direction:column;gap:7px;}
.field span{font-size:13px;font-weight:600;color:var(--muted);}
.field input{font-size:17px;font-weight:600;color:var(--ink);width:112px;padding:11px 12px;border:1px solid var(--line);border-radius:9px;background:var(--tint2);text-align:center;font-family:inherit;}
.field input:focus{outline:2px solid var(--brand);outline-offset:1px;background:#fff;}
.calc-btn{display:block;width:100%;font-size:14.5px;font-weight:600;padding:12px;border-radius:9px;cursor:pointer;margin-bottom:10px;min-height:44px;background:var(--tint);color:var(--brand-dark);border:1px solid var(--line);font-family:inherit;}
.calc-btn:hover{filter:brightness(.97);}
.result{margin:14px 0;background:var(--banner);color:#EAF3EE;border-radius:12px;padding:30px 18px;text-align:center;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:38px;font-weight:600;letter-spacing:1px;}
.result em{color:var(--hi);font-style:normal;}
.calc-note{font-size:12.5px;color:var(--muted);text-align:center;margin:0 0 16px;}
.calc-checks{display:flex;gap:26px;justify-content:center;flex-wrap:wrap;}
.calc-checks label{display:flex;align-items:center;gap:8px;font-size:13.5px;color:var(--body);cursor:pointer;}
.calc-checks input{width:16px;height:16px;accent-color:var(--brand);}
.quickchart{margin-top:16px;padding:12px 14px;background:var(--tint2);border-radius:9px;font-size:12.5px;color:var(--ink);text-align:center;}

.code{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:14px;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:16px 18px;margin:8px 0 20px;}

.table-card{background:var(--surface);border:1px solid var(--line);border-radius:14px;overflow:hidden;margin:0 auto;}
table{width:100%;border-collapse:collapse;font-size:14.5px;}
thead th{background:var(--banner);color:#EAF3EE;font-weight:600;text-align:left;padding:13px 18px;font-size:12px;letter-spacing:.08em;text-transform:uppercase;}
tbody td{padding:12px 18px;color:var(--body);border-top:1px solid var(--line);}
tbody tr:nth-child(odd) td{background:var(--tint2);}
td.num,.num{font-variant-numeric:tabular-nums;}
td.score{font-weight:600;color:var(--brand-dark);font-variant-numeric:tabular-nums;}
td.letter{font-weight:600;color:var(--ink);}

.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;}
.card-box{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:26px 28px;margin-bottom:18px;}
.card-box h3{font-size:19px;margin-bottom:10px;}
.card-box p{margin:0 0 10px;color:var(--body);}
.bestfor{font-size:13.5px;color:var(--muted);margin:0 0 16px;}
.bestfor b{color:var(--ink);}
.step,.feature{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:24px;}
.step h3,.feature h3{font-size:16px;margin-bottom:8px;}
.step p,.feature p{font-size:13.5px;color:var(--muted);margin:0;}
.step-num{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:50%;background:var(--tint);color:var(--brand-dark);font-weight:700;font-size:14px;margin-bottom:12px;}
.bullets{list-style:none;padding:0;margin:8px 0 0;display:flex;flex-direction:column;gap:11px;}
.bullets li{position:relative;padding-left:26px;font-size:15px;color:var(--body);}
.bullets li::before{content:"";position:absolute;left:4px;top:9px;width:9px;height:9px;border-radius:2px;background:var(--brand);}
.bullets strong{color:var(--ink);}

.faq{display:flex;flex-direction:column;gap:10px;}
details{background:var(--surface);border:1px solid var(--line);border-radius:11px;overflow:hidden;}
summary{list-style:none;cursor:pointer;padding:16px 20px;font-size:15px;font-weight:600;color:var(--ink);display:flex;justify-content:space-between;align-items:center;gap:16px;}
summary::-webkit-details-marker{display:none;}
summary::after{content:"+";font-size:20px;color:var(--brand);font-weight:600;}
details[open] summary::after{content:"\2013";}
details[open] summary{border-bottom:1px solid var(--line);}
.faq-body{padding:14px 20px 18px;font-size:14.5px;color:var(--body);}

/* blog */
.post-card{display:block;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:22px 24px;margin-bottom:14px;}
.post-card:hover{border-color:var(--brand);text-decoration:none;}
.post-card .tag{font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);}
.post-card h2,.post-card h3{font-size:19px;margin:4px 0 7px;color:var(--brand);}
.post-card p{font-size:14px;color:var(--muted);margin:0;}
.entry-content{font-size:16px;color:var(--body);}
.entry-content h2{font-size:26px;margin:28px 0 12px;}
.entry-content h3{font-size:20px;margin:24px 0 10px;}
.entry-content p{margin:0 0 16px;}
.entry-content ul,.entry-content ol{margin:0 0 16px;padding-left:22px;}
.entry-content img{border-radius:10px;}
.entry-meta{font-size:13px;color:var(--muted);margin-bottom:18px;}
.pagination{display:flex;gap:10px;justify-content:center;margin-top:24px;flex-wrap:wrap;}
.pagination .page-numbers{padding:8px 14px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);}
.pagination .current{background:var(--brand);color:#fff;border-color:var(--brand);}

hr.rule{border:0;border-top:1px solid var(--line);margin:34px 0;}
.center-action{text-align:center;margin-top:30px;}

/* footer */
.footer{background:var(--banner);color:#C9D8D1;padding:52px 0 26px;}
.footer a{color:#C9D8D1;}
.footer a:hover{color:#fff;text-decoration:none;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px;}
.footer .brand{color:#fff;}
.footer .brand span{color:var(--hi);}
.footer-tag{font-size:13.5px;color:#9FB3AB;margin-top:12px;max-width:300px;}
.footer h4{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:#8FA69D;font-family:'Inter',sans-serif;font-weight:700;margin:0 0 14px;}
.footer ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:9px;font-size:14px;}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:38px;padding-top:20px;text-align:center;font-size:13px;color:#8FA69D;}

@media (max-width:860px){.sheet .inner{padding:30px 24px;}.grid-3,.footer-grid{grid-template-columns:1fr;}.hero h1{font-size:42px;}.section h2{font-size:25px;}.main-nav ul{gap:14px;}}