/* site/site.css — public layer design. Warm paper, ink, one teal accent. System fonts: zero font bytes. */
:root{--paper:#faf9f6;--paper-2:#f1efe9;--ink:#15171c;--ink-2:#3b3f48;--ink-3:#60656f;--line:#e3dfd6;--teal:#0b6e6e;--teal-2:#094f4f;--teal-soft:#dff1ef;--red:#c8102e;--gold:#f4b400;--ok:#1b7f4b;--radius:14px;--shadow:0 10px 30px -18px rgba(21,23,28,.35);--font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,"Helvetica Neue",Arial,sans-serif;--mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;--max:1120px;--prose:72ch}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--paper);line-height:1.6;font-size:17px;-webkit-font-smoothing:antialiased}
img,svg,video{max-width:100%;height:auto;display:block}
a{color:var(--teal);text-decoration:underline;text-underline-offset:.14em;text-decoration-thickness:1px}.main-nav a,.crumbs a,.foot-grid a,.btn,.logo,.skip,.task-card a,.card a{text-decoration:none}.crumbs a:hover,.foot-grid a:hover{text-decoration:underline}a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.15;letter-spacing:-.015em;font-weight:800;color:var(--ink)}
h1{font-size:clamp(2rem,4.2vw,3.1rem)}h2{font-size:clamp(1.45rem,2.4vw,1.9rem);margin:2.2rem 0 .8rem}h3{font-size:1.15rem;margin:1.5rem 0 .5rem}h4{font-size:.95rem;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-3);margin-bottom:.6rem}
p{margin:0 0 1rem}ul,ol{margin:0 0 1rem 1.25rem}li{margin:.25rem 0}
.wrap{width:min(100% - 32px,var(--max));margin-inline:auto}
.muted{color:var(--ink-3)}.small{font-size:.9rem}.kicker{font-size:.8rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--teal);margin-bottom:.6rem}
.lede{font-size:1.2rem;color:var(--ink-2);max-width:var(--prose)}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:8px 12px;z-index:100}.skip:focus{left:8px}
.strip{background:var(--ink);color:#d7d9de;font-size:.78rem;text-align:center;padding:6px 16px;line-height:1.4}
/* header */
.site-head{position:sticky;top:0;z-index:50;background:rgba(250,249,246,.92);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.head-row{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px}
/* Logo: icon + two-line wordmark ("PTE Core" / "FREE PRACTICE"). Reference lockup is icon 80, name 46, tag 19,
   gaps 16 / 8; here scaled to a 38px icon. The tag's negative right margin cancels its trailing letter-spacing. */
.logo{display:inline-flex;align-items:center;gap:8px;flex:none;color:var(--ink);line-height:1}.logo:hover{text-decoration:none}
.logo-mark{width:38px;height:38px;flex:none;display:block}
.logo-text{display:flex;flex-direction:column;gap:4px;white-space:nowrap}
.logo-name{font-size:22px;font-weight:800;letter-spacing:-.02em;color:var(--ink)}
.logo-tag{font-size:9px;font-weight:700;letter-spacing:.32em;text-transform:uppercase;color:var(--teal);margin-right:-.32em}
.main-nav ul{list-style:none;margin:0;display:flex;gap:4px;align-items:center}.main-nav li{margin:0;position:relative}
.main-nav a{display:block;padding:10px 12px;border-radius:10px;color:var(--ink-2);font-weight:600;font-size:.95rem}.main-nav a:hover{background:var(--paper-2);text-decoration:none;color:var(--ink)}
.main-nav .sub{display:none;position:absolute;top:100%;left:0;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);padding:8px;min-width:280px;flex-direction:column;gap:0}
.main-nav .has-menu:hover>.sub,.main-nav .has-menu:focus-within>.sub{display:flex}.main-nav .sub a{padding:8px 10px;font-weight:500;font-size:.92rem}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:10px;padding:8px 12px;font:inherit;font-weight:700;cursor:pointer}
.nav-cta a.btn{padding:9px 16px;color:#fff}
/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 18px;border-radius:12px;font-weight:700;border:1px solid transparent;cursor:pointer;font:inherit;line-height:1.2;text-decoration:none}
.btn:hover{text-decoration:none}.btn-primary{background:var(--teal);color:#fff}.btn-primary:hover{background:var(--teal-2)}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink)}.btn-ghost:hover{background:var(--paper-2)}.btn-lg{padding:14px 22px;font-size:1.05rem}.btn-block{width:100%}
/* breadcrumb + article */
.crumbs{margin:18px 0 8px;font-size:.85rem}.crumbs ol{list-style:none;margin:0;display:flex;flex-wrap:wrap;gap:6px}.crumbs li+li::before{content:"/";color:var(--ink-3);margin-right:6px}.crumbs a{color:var(--ink-3)}
.article-wrap{padding-bottom:40px}.article{max-width:860px}.article-head{padding:16px 0 20px;border-bottom:1px solid var(--line);margin-bottom:24px}.article-head h1{margin:.2rem 0 .8rem}
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px;margin:18px 0 10px}.facts div{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 14px}.facts dt{font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-3);font-weight:700}.facts dd{font-weight:700;margin-top:4px}
.prose{max-width:var(--prose)}.prose h2{scroll-margin-top:90px}.prose table{width:100%;border-collapse:collapse;margin:1rem 0 1.4rem;font-size:.95rem}.prose th,.prose td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--line);vertical-align:top}.prose th{background:var(--paper-2);font-weight:700}
.prose blockquote{border-left:4px solid var(--teal);padding:8px 16px;background:#fff;border-radius:0 12px 12px 0;margin:1rem 0;color:var(--ink-2)}
.prose code{font-family:var(--mono);font-size:.9em;background:var(--paper-2);padding:1px 5px;border-radius:5px}
.callout{border:1px solid var(--line);border-left:5px solid var(--teal);background:#fff;border-radius:12px;padding:14px 16px;margin:1.2rem 0}.callout.warn{border-left-color:var(--gold)}.callout.bad{border-left-color:var(--red)}.callout.ok{border-left-color:var(--ok)}.callout p:last-child{margin:0}
.example{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;margin:1.2rem 0;box-shadow:var(--shadow)}.example .label{font-size:.75rem;text-transform:uppercase;letter-spacing:.1em;color:var(--teal);font-weight:800;margin-bottom:8px}
.steps{counter-reset:s;list-style:none;margin-left:0}.steps li{counter-increment:s;position:relative;padding-left:44px;margin:.7rem 0}.steps li::before{content:counter(s);position:absolute;left:0;top:0;width:30px;height:30px;border-radius:50%;background:var(--teal-soft);color:var(--teal-2);font-weight:800;display:grid;place-items:center;font-size:.9rem}
.checks{list-style:none;margin-left:0}.checks li{padding-left:28px;position:relative}.checks li::before{content:"\2713";position:absolute;left:4px;color:var(--ok);font-weight:900}
.grid-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px}.card h3{margin-top:0}.card a.stretch::after{content:"";position:absolute;inset:0}.card.linked{position:relative}.card.linked:hover{border-color:var(--teal)}
.badge{display:inline-block;font-size:.72rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;padding:3px 8px;border-radius:999px;background:var(--teal-soft);color:var(--teal-2)}
/* locked preview */
.preview{background:linear-gradient(180deg,#fff,var(--paper-2));border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;margin:4px 0 28px}
.preview h2{margin:0 0 .3rem;font-size:1.3rem}.preview-list{list-style:none;margin:14px 0 16px}.preview-list li{position:relative;display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin:8px 0;overflow:hidden}
.preview-num{width:28px;height:28px;border-radius:8px;background:var(--teal-soft);color:var(--teal-2);display:grid;place-items:center;font-weight:800;font-size:.85rem;flex:none}
.preview-text{flex:1;white-space:nowrap;overflow:hidden;text-overflow:clip;color:var(--ink-2)}
.preview-blur{position:absolute;right:44px;top:0;bottom:0;width:45%;background:linear-gradient(90deg,rgba(255,255,255,0),#fff 55%);pointer-events:none}
.lock{position:absolute;right:14px;top:50%;transform:translateY(-50%);font-size:.95rem;opacity:.75}
/* author, related, cta, footer */
.author{display:flex;gap:14px;align-items:flex-start;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:18px 0;margin:30px 0 10px}.author-avatar{width:44px;height:44px;border-radius:50%;background:var(--ink);color:#fff;display:grid;place-items:center;font-weight:800;flex:none}.author p{margin:.3rem 0 0}
.related h2{font-size:1.2rem;margin-top:1.5rem}.related-list{list-style:none;margin-left:0}.related-list li{padding:8px 0;border-bottom:1px dashed var(--line)}
.cta-band{background:var(--ink);color:#e8e9ec;padding:40px 0;margin-top:20px}.cta-band h2{color:#fff;margin:0 0 .4rem}.cta-band p{margin:0;color:#b9bcc5}.cta-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:20px}.cta-actions{display:flex;gap:10px;flex-wrap:wrap}.cta-band .btn-ghost{background:transparent;color:#fff;border-color:#4a4f5a}
.site-foot{border-top:1px solid var(--line);background:var(--paper-2);padding:40px 0 20px;font-size:.92rem}.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:28px}.foot-grid ul{list-style:none;margin:0}.foot-grid li{margin:.3rem 0}.foot-grid a{color:var(--ink-2)}.foot-grid h3{font-size:.95rem;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-3);margin:0 0 .6rem}.foot-bar{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;border-top:1px solid var(--line);margin-top:28px;padding-top:16px;color:var(--ink-3);font-size:.85rem}
/* home */
.hero{padding:56px 0 36px}.hero-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:40px;align-items:center}.hero h1{font-size:clamp(2.3rem,5vw,3.6rem);margin:.4rem 0 1rem}.hero .lede{font-size:1.25rem}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0 14px}.hero-note{font-size:.88rem;color:var(--ink-3)}
.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin:26px 0}.stat{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 16px}.stat b{display:block;font-size:1.6rem;letter-spacing:-.02em}.stat span{font-size:.82rem;color:var(--ink-3)}
.shot{border:1px solid var(--line);border-radius:16px;overflow:hidden;background:#fff;box-shadow:var(--shadow)}
.section{padding:44px 0}.section-head{max-width:720px;margin-bottom:22px}.section-head h2{margin-top:0}
.task-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}.task-card{position:relative;background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 16px;display:flex;flex-direction:column;gap:6px}.task-card:hover{border-color:var(--teal)}.task-card b{font-size:1rem}.task-card a::after{content:"";position:absolute;inset:0}.task-card .meta{font-size:.82rem;color:var(--ink-3)}
/* tools */
.tool{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);margin:18px 0 26px}.tool label{display:block;font-weight:700;font-size:.9rem;margin-bottom:6px}.tool input,.tool select{width:100%;font:inherit;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:#fff}.tool .row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}.tool .result{margin-top:16px;padding:14px 16px;border-radius:12px;background:var(--teal-soft);color:var(--teal-2);font-weight:700}.tool .result.big{font-size:1.3rem}
/* auth */
.auth-wrap{min-height:70vh;display:grid;place-items:center;padding:40px 0}.auth-card{width:min(100%,440px);background:#fff;border:1px solid var(--line);border-radius:18px;padding:28px;box-shadow:var(--shadow)}.auth-card h1{font-size:1.6rem;margin-bottom:.4rem}.auth-card .or{display:flex;align-items:center;gap:10px;color:var(--ink-3);font-size:.85rem;margin:16px 0}.auth-card .or::before,.auth-card .or::after{content:"";flex:1;height:1px;background:var(--line)}
.field{margin:12px 0}.field label{display:block;font-weight:700;font-size:.9rem;margin-bottom:6px}.field input{width:100%;font:inherit;padding:11px 12px;border:1px solid var(--line);border-radius:10px}.field input:focus{outline:2px solid var(--teal);outline-offset:1px;border-color:var(--teal)}
.form-error{background:#fdecee;color:#8a1020;border:1px solid #f3c4ca;border-radius:10px;padding:10px 12px;font-size:.9rem;margin:10px 0;display:none}.form-error.show{display:block}
/* ads slots (only rendered live) */
.ad-slot{margin:24px 0;min-height:90px;text-align:center}
/* responsive */
@media (max-width:900px){.foot-grid{grid-template-columns:1fr 1fr}.hero-grid{grid-template-columns:1fr}.hero{padding:36px 0 20px}}
@media (max-width:760px){.nav-toggle{display:inline-block}.main-nav ul{display:none;position:absolute;left:0;right:0;top:100%;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:8px 16px 16px;gap:0;box-shadow:var(--shadow)}.main-nav.open ul{display:flex}.main-nav .sub{display:flex;position:static;border:0;box-shadow:none;padding:0 0 6px 12px;min-width:0}.main-nav .sub a{padding:6px 10px}.nav-cta{margin-top:8px}.foot-grid{grid-template-columns:1fr}.cta-row{flex-direction:column;align-items:flex-start}body{font-size:16px}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}