:root{
  --bg:#0a1728; --ink:#ffffff; --muted:#a8b6c8; --read:#c8d2df;
  --accent:#3f8a3c; --accent-h:#4f9a43;
  --navy:#14365f; --green:#4f9a43; --green-h:#5aa64c; --gold-txt:#8fc677;
  --border:rgba(255,255,255,.12); --card:rgba(255,255,255,.045);
  --maxw:1120px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--muted);line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:#8fc677;text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
h1,h2,h3,h4{color:var(--ink);line-height:1.18;font-weight:800;letter-spacing:-.01em}
/* header */
header{position:sticky;top:0;z-index:50;background:rgba(10,23,40,.9);backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.08)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:20px;height:72px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;color:#fff;font-size:1.1rem;white-space:nowrap}
.brand img{height:42px;width:42px;object-fit:contain}
.brand .sm{font-size:.55em;vertical-align:super;font-weight:700}
.navlinks{display:flex;gap:22px;align-items:center}
.navlinks a{color:#c3cad8;font-size:.92rem;font-weight:600;white-space:nowrap}
.navlinks a:hover{color:#fff;text-decoration:none}
.hamburger{display:none;font-size:1.7rem;color:#fff;cursor:pointer;background:none;border:0;line-height:1;padding:2px 6px}
.nav-toggle{position:absolute;opacity:0;width:1px;height:1px;pointer-events:none}
@media(max-width:1040px){
  .hamburger{display:block}
  .navlinks{display:none;position:absolute;top:100%;left:0;right:0;background:#0c1a2e;flex-direction:column;align-items:stretch;gap:0;padding:6px 24px 16px;border-bottom:1px solid var(--border);box-shadow:0 18px 34px rgba(0,0,0,.45)}
  .nav-toggle:checked ~ .navlinks{display:flex}
  .navlinks a{padding:13px 2px;border-top:1px solid rgba(255,255,255,.07)}
}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:13px 26px;border-radius:999px;font-weight:700;font-size:.95rem;border:2px solid var(--accent);white-space:nowrap;transition:.15s}
.btn:hover{background:var(--accent-h);border-color:var(--accent-h);text-decoration:none}
.btn.ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.32)}
.btn.ghost:hover{background:rgba(255,255,255,.08)}
.btn .ic{margin-right:8px}
/* student-under-tree watermark */
.tree-bg{position:fixed;right:0;bottom:0;width:min(26vw,360px);height:min(72vh,620px);background:url('student-tree.png') right bottom/contain no-repeat;opacity:.2;pointer-events:none;z-index:-1}
@media(max-width:1080px){.tree-bg{display:none}}
/* hero */
.g-hero{position:relative;overflow:hidden;padding:64px 0 30px;border-bottom:1px solid rgba(255,255,255,.06)}
.g-hero>.wrap{position:relative;z-index:2}
.g-hero::after{content:"";position:absolute;right:26px;bottom:0;width:340px;height:120px;background:url('roots-motif.png') right bottom/contain no-repeat;opacity:.45;z-index:1;pointer-events:none}
@media(max-width:760px){.g-hero::after{display:none}}
.g-hero .kgold{color:var(--gold-txt);font-size:.76rem;letter-spacing:.16em;text-transform:uppercase;font-weight:700}
.g-hero h1{color:#fff;font-size:2.9rem;margin:16px 0 0;max-width:900px}
.g-hero .sub{color:var(--muted);font-size:1.18rem;margin-top:16px;max-width:760px}
.g-hero .rule{width:64px;height:5px;background:var(--green);border-radius:3px;margin:26px 0 0}
.g-hero .cta-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px}
/* sections */
section{padding:56px 0;border-top:1px solid rgba(255,255,255,.06)}
section:first-of-type{border-top:none}
.kpill{display:inline-block;background:var(--green);color:#fff;font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;font-weight:700;padding:6px 15px;border-radius:999px;margin-bottom:18px}
h2.sec{font-size:1.9rem;margin-bottom:.5rem}
.lead{color:var(--muted);font-size:1.1rem;max-width:780px;margin-bottom:32px}
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:900px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.g2,.g3,.g4{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:24px}
.card h3{color:#fff;font-size:1.08rem;margin-bottom:8px}
.card h4{color:var(--gold-txt);font-size:.82rem;letter-spacing:.06em;text-transform:uppercase;margin-bottom:8px}
.card p{color:var(--muted);font-size:.98rem}
.card.navy{background:var(--navy);border-color:var(--navy)}
.card.navy h3,.card.navy p{color:#fff}
.card.navy p{color:#cfe0ef}
/* principle blocks */
.principle{display:grid;grid-template-columns:84px 1fr;gap:26px;padding:34px 0;border-top:1px solid var(--border)}
.principle:first-child{border-top:none}
.p-badge{position:relative;width:72px;height:72px;border-radius:50%;background:var(--navy);border:2px solid var(--green);display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.7rem;font-weight:800}
.p-badge::after{content:"";position:absolute;top:-9px;right:-11px;width:27px;height:29px;background:url('leaf.svg') center/contain no-repeat;transform:rotate(22deg);filter:drop-shadow(0 2px 4px rgba(0,0,0,.4))}
/* summary split */
.summary-split{display:grid;grid-template-columns:.72fr 1.28fr;gap:46px;align-items:center}
.s-visual{display:flex;justify-content:center}
.s-visual img{width:100%;max-width:270px;filter:drop-shadow(0 14px 36px rgba(0,0,0,.5))}
@media(max-width:760px){.summary-split{grid-template-columns:1fr;gap:26px}.s-visual img{max-width:180px}}
.p-body .tag{color:var(--gold-txt);font-size:.76rem;letter-spacing:.14em;text-transform:uppercase;font-weight:700}
.p-body h3{color:#fff;font-size:1.5rem;margin:6px 0 6px}
.p-body .headline{color:var(--muted);font-size:1.02rem;margin-bottom:18px;font-weight:600}
.p-body .desc{color:var(--muted);font-size:1.02rem;margin-bottom:20px;max-width:760px}
@media(max-width:640px){.principle{grid-template-columns:1fr;gap:14px}.p-badge{width:56px;height:56px;font-size:1.3rem}}
/* quote / callout */
.callout{border-left:4px solid var(--green);background:rgba(79,154,67,.08);padding:20px 24px;border-radius:0 12px 12px 0;color:#fff;font-size:1.12rem;font-weight:600;line-height:1.5;margin:24px 0}
.callout .who{display:block;color:var(--muted);font-size:.9rem;font-weight:500;margin-top:8px}
/* do / dont */
.dd h4{display:flex;align-items:center;gap:8px}
.do{border-color:rgba(79,154,67,.5)}
.do h3::before{content:"\2713\00a0\00a0";color:var(--green-h)}
.dont{border-color:rgba(190,90,90,.4)}
.dont h3::before{content:"\2717\00a0\00a0";color:#d98b8b}
/* prose (privacy) */
.prose{max-width:820px;font-size:1.02rem;line-height:1.75;color:var(--read)}
.prose h2{color:#fff;font-size:1.5rem;margin:38px 0 8px}
.prose h3{color:#fff;font-size:1.12rem;margin:24px 0 6px}
.prose p{margin:0 0 1rem}
.prose ul{margin:0 0 1rem 1.1rem}
.prose li{margin:.3rem 0}
.prose strong{color:#fff}
.prose a{color:#8fc677;text-decoration:underline}
.toc{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:22px 26px;margin:20px 0 8px;max-width:820px}
.toc h3{color:#fff;font-size:.95rem;text-transform:uppercase;letter-spacing:.08em;margin-bottom:12px}
.toc ol{margin-left:1.1rem;color:var(--muted);columns:2;column-gap:28px}
.toc li{margin:.25rem 0}
@media(max-width:640px){.toc ol{columns:1}}
table.pv{width:100%;border-collapse:collapse;margin:12px 0 20px;max-width:820px;font-size:.96rem}
table.pv th,table.pv td{border:1px solid var(--border);padding:11px 14px;text-align:left;vertical-align:top}
table.pv th{background:rgba(255,255,255,.05);color:#fff;font-weight:700}
table.pv td{color:var(--muted)}
/* footer */
footer{border-top:1px solid rgba(255,255,255,.1);padding:34px 0 46px;text-align:center;margin-top:40px}
footer .brandline{color:#fff;font-weight:700;margin-bottom:10px}
footer .flinks{display:flex;gap:22px;justify-content:center;flex-wrap:wrap;margin:14px 0}
footer .flinks a{color:#c3cad8;font-size:.92rem;font-weight:600}
footer .flinks a:hover{color:#fff}
footer .disc{font-size:.84rem;color:#8592a8;max-width:860px;margin:16px auto 0}
footer .visit{font-size:.9rem;color:#aeb8c8;margin-top:12px}
footer .visit b{color:#fff}