:root{--bg:#f4f6f8;--panel:#fff;--panel2:#eef1f4;--text:#18202a;--muted:#6c7684;--line:#dce2e8;--accent:#7b2f52;--accent2:#9b4b70;--ok:#2f7d5f;--warn:#9a6a18;--danger:#a94442;--shadow:0 12px 35px rgba(28,36,48,.08)}
body.dark{--bg:#22272d;--panel:#2c3239;--panel2:#343b43;--text:#f4f6f8;--muted:#aeb7c2;--line:#444c55;--accent:#cf6c9a;--accent2:#e089b1;--ok:#71c6a0;--warn:#e0b15a;--danger:#ef8b88;--shadow:0 12px 35px rgba(0,0,0,.22)}
*{box-sizing:border-box}body{margin:0;font-family:Inter,Segoe UI,Arial,sans-serif;background:var(--bg);color:var(--text)}button,input,textarea{font:inherit}.app-shell{display:grid;grid-template-columns:255px 1fr;min-height:100vh}.sidebar{background:var(--panel);border-right:1px solid var(--line);padding:24px 18px;display:flex;flex-direction:column;gap:28px;position:sticky;top:0;height:100vh}.brand{display:flex;gap:12px;align-items:center}.brand-mark{width:48px;height:48px;border-radius:14px;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;display:grid;place-items:center;font-weight:800}.brand strong,.brand span{display:block}.brand span{font-size:12px;color:var(--muted);margin-top:2px}.sidebar nav{display:flex;flex-direction:column;gap:7px}.nav-item{border:0;background:transparent;color:var(--muted);text-align:left;padding:12px 14px;border-radius:10px;cursor:pointer}.nav-item:hover,.nav-item.active{background:var(--panel2);color:var(--text);font-weight:700}.sidebar-note{margin-top:auto;padding:14px;border:1px solid var(--line);border-radius:12px}.sidebar-note strong,.sidebar-note span{display:block}.sidebar-note span{font-size:12px;color:var(--muted);margin-top:3px}.main{padding:28px;max-width:1450px;width:100%;margin:auto}.topbar{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:24px}.topbar h1{margin:0;font-size:28px}.topbar p{color:var(--muted);margin:6px 0 0}.icon-btn,.secondary-btn{border:1px solid var(--line);background:var(--panel);color:var(--text);border-radius:10px;padding:10px 13px;cursor:pointer}.tab{display:none}.tab.active{display:block}.hero-card,.card{background:var(--panel);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:18px}.hero-card{padding:28px;display:grid;grid-template-columns:1.1fr 1fr;gap:28px;align-items:center}.hero-copy 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var(--line);border-radius:14px;display:flex;gap:12px;align-items:center}.loading span{display:block;color:var(--muted);font-size:13px;margin-top:3px}.spinner{width:24px;height:24px;border:3px solid var(--line);border-top-color:var(--accent);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.hidden{display:none!important}.alert{padding:14px 16px;border-radius:12px;margin-top:16px}.alert.error{background:rgba(169,68,66,.12);color:var(--danger)}.alert.info{background:var(--panel2);color:var(--text)}.empty-state{text-align:center;padding:70px 20px;color:var(--muted)}.result-header{padding:22px;display:flex;justify-content:space-between;align-items:center}.result-header h2{margin:4px 0}.result-header p{margin:0;color:var(--muted)}.score-ring{width:88px;height:88px;border-radius:50%;border:9px solid var(--panel2);display:grid;place-items:center;position:relative}.score-ring span{font-size:26px;font-weight:800}.score-ring small{position:absolute;bottom:14px;color:var(--muted)}.score-card b{font-size:22px}.score-card span{display:block;color:var(--muted);font-size:12px;margin-top:4px}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:18px}.card{padding:22px;margin-top:18px}.section-title{display:flex;justify-content:space-between;gap:15px;align-items:center;margin-bottom:14px}.section-title h3{margin:3px 0 0}.stack{display:flex;flex-direction:column;gap:10px}.issue,.seo-row,.history-row{border:1px solid var(--line);border-radius:12px;padding:14px;background:var(--bg)}.issue-top,.seo-top{display:flex;justify-content:space-between;gap:10px}.issue p,.seo-row p{margin:6px 0 0;color:var(--muted);font-size:13px;line-height:1.5}.badge{font-size:11px;padding:5px 8px;border-radius:999px;background:var(--panel2);white-space:nowrap}.badge.high{color:var(--danger)}.badge.medium{color:var(--warn)}.badge.low{color:var(--ok)}.plan-card strong,.plan-card span{display:block}.plan-card span{color:var(--muted);font-size:13px;margin-top:7px;line-height:1.45}.plan-card em{display:inline-block;margin-top:10px;font-style:normal;font-size:11px;padding:5px 8px;border-radius:999px;background:var(--panel2)}.steps{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;padding:0;counter-reset:item;list-style:none}.steps li{counter-increment:item;border:1px solid var(--line);border-radius:12px;padding:14px;background:var(--bg)}.steps li:before{content:counter(item);display:inline-grid;place-items:center;width:25px;height:25px;border-radius:8px;background:var(--accent);color:#fff;font-weight:700;margin-right:9px}.message-box{width:100%;resize:vertical;background:var(--bg);color:var(--text);border:1px solid var(--line);border-radius:12px;padding:15px;line-height:1.55}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;font-size:13px}th,td{text-align:left;padding:10px;border-bottom:1px solid var(--line);vertical-align:top}th{color:var(--muted);font-size:11px;text-transform:uppercase;letter-spacing:.06em}.prose{line-height:1.65}.prose h3{margin-top:24px}@media(max-width:980px){.app-shell{grid-template-columns:1fr}.sidebar{position:static;height:auto;border-right:0;border-bottom:1px solid var(--line)}.sidebar nav{flex-direction:row;flex-wrap:wrap}.sidebar-note{display:none}.hero-card,.two-col{grid-template-columns:1fr}.feature-grid,.score-grid,.plan-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:620px){.main{padding:16px}.url-row{flex-direction:column}.feature-grid,.score-grid,.plan-grid,.steps{grid-template-columns:1fr}.topbar h1{font-size:23px}.hero-copy h2{font-size:26px}}