:root{--tsc-bg:#f6f7fb;--tsc-surface:#ffffff;--tsc-text:#172033;--tsc-muted:#607089;--tsc-line:#dde3ee;--tsc-brand:#2357d8;--tsc-brand-soft:#e9efff;--tsc-radius:18px;--tsc-shadow:0 18px 50px rgba(23,32,51,.08)}*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--tsc-bg);color:var(--tsc-text);line-height:1.6}.site-shell{min-height:100vh;display:flex;flex-direction:column}.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);border-bottom:1px solid var(--tsc-line)}.site-header__inner,.site-footer__inner,.page-main{width:min(1160px,calc(100% - 32px));margin:0 auto}.site-header__inner{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 0}.brand{font-weight:800;color:var(--tsc-text);text-decoration:none}.nav{display:flex;gap:14px;flex-wrap:wrap}.nav a{color:var(--tsc-muted);text-decoration:none;font-weight:650;font-size:14px}.nav a:hover{color:var(--tsc-brand)}.page-main{padding:44px 0;flex:1}.hero,.card,.content-section{background:var(--tsc-surface);border:1px solid var(--tsc-line);border-radius:var(--tsc-radius);box-shadow:var(--tsc-shadow)}.hero{padding:36px;margin-bottom:22px}.eyebrow{color:var(--tsc-brand);font-weight:800;text-transform:uppercase;letter-spacing:.08em;font-size:12px}.hero h1{font-size:clamp(32px,5vw,58px);line-height:1.02;margin:10px 0 16px}.hero p{max-width:760px;color:var(--tsc-muted);font-size:18px}.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}.button{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;padding:11px 18px;text-decoration:none;font-weight:800;border:1px solid var(--tsc-line);background:#fff;color:var(--tsc-text)}.button.primary{background:var(--tsc-brand);border-color:var(--tsc-brand);color:#fff}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px}.card,.content-section{padding:22px}.card h2,.card h3{margin-top:0}.meta-list{display:flex;gap:10px;flex-wrap:wrap;padding:0;margin:18px 0;list-style:none}.meta-list li{background:var(--tsc-brand-soft);color:var(--tsc-brand);border-radius:999px;padding:6px 10px;font-size:13px;font-weight:700}.site-footer{border-top:1px solid var(--tsc-line);background:#fff;color:var(--tsc-muted);padding:26px 0;margin-top:auto}@media(max-width:720px){.site-header__inner{align-items:flex-start;flex-direction:column}.hero{padding:24px}.page-main{padding:24px 0}.nav{gap:10px}}

/* Round 6 operational quality hardening */
.site-header__inner{min-height:64px}.hero{overflow:hidden}.meta-list{display:flex;gap:10px;flex-wrap:wrap;padding:0;margin:18px 0 0;list-style:none}.meta-list li{border:1px solid var(--tsc-line);background:var(--tsc-brand-soft);color:var(--tsc-brand);border-radius:999px;padding:5px 10px;font-size:12px;font-weight:750}.operational-section{margin-top:18px;background:var(--tsc-surface);border:1px solid var(--tsc-line);border-radius:var(--tsc-radius);box-shadow:var(--tsc-shadow);padding:26px}.operational-section h2{margin:0 0 10px;font-size:22px}.operational-section p{color:var(--tsc-muted);margin:0 0 12px}.operational-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin:16px 0 0;padding:0;list-style:none}.operational-list li{border:1px solid var(--tsc-line);border-radius:14px;padding:12px;background:#fff}.site-footer{margin-top:auto;border-top:1px solid var(--tsc-line);background:#fff}@media (max-width:760px){.site-header__inner{align-items:flex-start;flex-direction:column;padding:12px 0}.nav{width:100%;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.nav a{border:1px solid var(--tsc-line);border-radius:12px;padding:8px 10px;background:#fff}.page-main{width:min(100% - 24px,1160px);padding:24px 0}.hero{padding:24px}.hero h1{font-size:clamp(28px,9vw,40px);line-height:1.08}.hero p{font-size:16px}.button{width:100%}.grid{grid-template-columns:1fr}}


/* Round 7 production page review */
.breadcrumb{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:0 0 16px;color:var(--tsc-muted);font-size:13px}
.breadcrumb a{color:var(--tsc-muted);text-decoration:none;font-weight:750}.breadcrumb a:hover{color:var(--tsc-brand)}.breadcrumb__sep{opacity:.55}
.page-action-section{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(240px,.8fr);gap:18px;margin-top:18px;background:linear-gradient(135deg,#ffffff,#f8fbff);border:1px solid var(--tsc-line);border-radius:var(--tsc-radius);box-shadow:var(--tsc-shadow);padding:26px}
.page-action-section h2{margin:6px 0 10px;font-size:24px;line-height:1.2}.page-action-section p{margin:0;color:var(--tsc-muted)}
.page-checklist{margin:0;padding:0;list-style:none;display:grid;gap:10px}.page-checklist li{border:1px solid var(--tsc-line);border-radius:14px;background:#fff;padding:12px 14px;font-weight:750;color:var(--tsc-text)}
.card p{color:var(--tsc-muted)}@media(max-width:760px){.page-action-section{grid-template-columns:1fr;padding:20px}.breadcrumb{font-size:12px;margin-bottom:12px}.page-checklist li{padding:10px 12px}}


/* Round 8 browser-level UI hardening */
html{scroll-padding-top:88px}body{overflow-wrap:anywhere}.skip-link{position:absolute;left:12px;top:8px;z-index:80;transform:translateY(-140%);background:var(--tsc-text);color:#fff;border-radius:12px;padding:10px 14px;text-decoration:none;font-weight:850}.skip-link:focus{transform:translateY(0)}a:focus-visible,button:focus-visible,textarea:focus-visible{outline:3px solid color-mix(in srgb,var(--tsc-brand) 55%,white);outline-offset:3px}.site-header__inner{min-height:58px}.brand{display:inline-flex;align-items:center;min-height:40px}.nav a{display:inline-flex;align-items:center;min-height:38px;border-radius:999px;padding:6px 10px}.nav a[aria-current="page"]{background:var(--tsc-brand-soft);color:var(--tsc-brand)}.hero{display:grid;gap:12px}.hero h1{max-width:920px}.hero p{margin-top:0}.cta-row .button{min-height:46px}.button:hover{transform:translateY(-1px);box-shadow:0 10px 24px rgba(23,32,51,.08)}.card,.page-action-section,.hero{transition:box-shadow .18s ease,transform .18s ease}.card:hover{transform:translateY(-2px)}.site-guidance-strip{margin:0 0 16px;border:1px solid var(--tsc-line);border-radius:16px;background:#fff;padding:12px 14px;color:var(--tsc-muted);font-size:14px;display:flex;gap:10px;align-items:center;justify-content:space-between}.site-guidance-strip strong{color:var(--tsc-text)}
@media(max-width:760px){html{scroll-padding-top:12px}.site-header{position:relative}.site-header__inner{gap:10px}.brand{font-size:17px}.nav{width:100%;display:flex;flex-wrap:nowrap;overflow-x:auto;gap:8px;padding-bottom:4px;scrollbar-width:thin}.nav a{white-space:nowrap;min-height:40px;flex:0 0 auto}.page-main{width:min(100% - 22px,1160px);padding:18px 0}.hero{padding:20px;border-radius:16px}.hero h1{font-size:clamp(26px,8vw,36px);line-height:1.08;margin:4px 0 8px}.hero p{font-size:15.5px}.meta-list{margin:10px 0 0}.meta-list li{font-size:11.5px}.cta-row{gap:10px}.cta-row .button{width:100%;min-height:46px}.grid{gap:12px}.card,.content-section,.page-action-section{border-radius:16px;padding:18px}.site-guidance-strip{display:block;font-size:13px}.site-footer__inner{font-size:13px}}
@media(max-width:420px){.page-main{width:min(100% - 18px,1160px)}.hero h1{font-size:25px}.nav a{font-size:13px}.page-action-section h2{font-size:20px}}

/* Round 8 touch floor */
.button,.cta-row .button{min-height:44px}


/* Round 9 conversion and monetization polish */
.section-kicker{margin:0 0 8px;color:var(--tsc-brand);font-size:12px;font-weight:850;text-transform:uppercase;letter-spacing:.08em}.conversion-section{display:grid;grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);gap:22px;align-items:start;margin:18px 0;background:linear-gradient(135deg,#ffffff 0%,#f7faff 100%);border:1px solid var(--tsc-line);border-radius:var(--tsc-radius);box-shadow:var(--tsc-shadow);padding:28px}.conversion-section h2{margin:0 0 10px;font-size:clamp(24px,3vw,34px);line-height:1.15}.conversion-section p{margin:0;color:var(--tsc-muted)}.conversion-card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:12px}.conversion-card{display:grid;gap:7px;min-height:128px;border:1px solid var(--tsc-line);border-radius:16px;background:#fff;padding:16px;text-decoration:none;color:var(--tsc-text);box-shadow:0 10px 28px rgba(23,32,51,.05)}.conversion-card strong{font-size:16px;line-height:1.25}.conversion-card span{color:var(--tsc-muted);font-size:14px;line-height:1.45}.conversion-card:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--tsc-brand) 35%,var(--tsc-line));box-shadow:0 18px 38px rgba(35,87,216,.1)}.ad-slot{margin:22px 0 0;border:1px dashed color-mix(in srgb,var(--tsc-line) 70%,var(--tsc-muted));border-radius:16px;background:rgba(255,255,255,.72);padding:14px 16px;color:var(--tsc-muted);display:flex;gap:14px;align-items:center;justify-content:space-between}.ad-slot span{display:inline-flex;border:1px solid var(--tsc-line);border-radius:999px;padding:5px 10px;color:var(--tsc-brand);background:var(--tsc-brand-soft);font-weight:850;font-size:12px;text-transform:uppercase;letter-spacing:.06em}.ad-slot p{margin:0;font-size:13px;line-height:1.45}.hero+.conversion-section{margin-top:-4px}@media(max-width:820px){.conversion-section{grid-template-columns:1fr;padding:20px}.conversion-card-grid{grid-template-columns:1fr}.conversion-card{min-height:auto}.ad-slot{display:block}.ad-slot span{margin-bottom:8px}.hero+.conversion-section{margin-top:12px}}

/* Round 15 production copy polish */
.page-action-section .eyebrow{letter-spacing:.08em;text-transform:uppercase;}
.ad-slot--quiet span{font-weight:700;}

/* Formal operation stage: user-facing readiness polish */
.site-guidance-strip{margin:0 auto 1rem;max-width:1120px;padding:.72rem 1rem;border:1px solid rgba(15,23,42,.10);border-radius:16px;background:rgba(255,255,255,.74);color:var(--tsc-muted,#475569);font-size:.95rem}
.hero .cta-row .button,.page-action-section .button{min-height:44px}
.formal-operation-ready{display:block}