:root{color-scheme:dark;--bg0:#0b0c0b;--bg1:#151613;--panel:rgba(242,239,231,0.035);--panel-border:rgba(242,239,231,0.12);--text:#f2efe7;--muted:#b8b1a3;--accent:#d7b56d;--accent-2:#f0cf7f;--button-text:#0a0a10}*{box-sizing:border-box}body{margin:0;min-height:100vh;font-family:"Segoe UI","Inter",system-ui,sans-serif;color:var(--text);background:var(--bg0)}.shell{max-width:980px;margin:0 auto;padding:32px 20px 56px}.topbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;margin-bottom:28px}.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:0}.brand-dot{width:10px;height:10px;border-radius:2px;background:var(--accent)}.brand-lign{color:#a8cbe6}nav{display:flex;flex-wrap:wrap;gap:10px}.nav-link{padding:8px 12px;border-radius:4px;color:var(--muted);text-decoration:none;border:1px solid transparent}.nav-link:hover,.nav-link.active{color:var(--text);border-color:rgba(242,239,231,0.18);background:rgba(242,239,231,0.045)}.hero{margin-bottom:22px}.eyebrow{margin:0 0 10px;color:var(--accent);text-transform:uppercase;letter-spacing:0.12em;font-size:0.82rem;font-weight:700}h1{margin:0 0 12px;font-size:clamp(2rem,5vw,3.2rem);line-height:1.02}.summary{max-width:760px;margin:0;color:var(--muted);font-size:1.02rem;line-height:1.65}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}.card{padding:18px 18px 16px;border-radius:6px;background:var(--panel);border:1px solid var(--panel-border);box-shadow:none}.card h2{margin:0 0 10px;font-size:1rem}.card p{margin:0 0 10px;color:var(--muted);line-height:1.6}.card ul{margin:0;padding-left:18px;color:var(--text);line-height:1.55}.card li+li{margin-top:8px}.snippet{margin-top:12px;padding:14px 16px;border-radius:4px;background:rgba(242,239,231,0.035);border:1px solid var(--panel-border);color:var(--text);line-height:1.65;white-space:pre-wrap}a{color:var(--accent)}footer{margin-top:28px;padding-top:16px;border-top:1px solid var(--panel-border);color:var(--muted);line-height:1.6}.accent{color:var(--accent-2)}.topbar-actions{display:flex;flex-wrap:wrap;align-items:center;justify-content:flex-end;gap:12px;margin-left:auto}.site-auth{position:relative;z-index:50;color:var(--text,#f2efe7);font:0.92rem/1.35 "Segoe UI","Inter",system-ui,sans-serif}.site-auth.is-floating{position:fixed;top:14px;right:14px;z-index:1200;color:#f2efe7}.site-auth[hidden]{display:none !important}.site-auth-trigger{display:inline-flex;align-items:center;gap:8px;min-height:38px;padding:8px 12px;border:1px solid var(--panel-border,rgba(242,239,231,0.18));border-radius:4px;color:inherit;background:rgba(16,17,15,0.72);box-shadow:none;cursor:pointer;user-select:none;list-style:none}.site-auth-trigger::-webkit-details-marker{display:none}.site-auth-avatar{width:10px;height:10px;border-radius:2px;background:var(--muted,#94a3b8);box-shadow:0 0 0 3px rgba(242,239,231,0.08)}.site-auth.is-signed-in .site-auth-avatar{background:#22c55e;box-shadow:0 0 0 3px rgba(34,197,94,0.2)}.site-auth-panel{position:absolute;top:calc(100%+10px);right:0;display:grid;gap:12px;width:min(340px,calc(100vw - 28px));padding:14px;border:1px solid rgba(148,163,184,0.28);border-radius:4px;color:#0f172a;background:rgba(255,255,255,0.98);box-shadow:0 22px 60px rgba(15,23,42,0.22)}.site-auth:not([open]) .site-auth-panel{display:none}.site-auth-copy,.site-auth-user{color:#475569;font-size:0.88rem;line-height:1.45}.site-auth-user{color:#0f172a;font-weight:760}.site-auth-copy.error{color:#b91c1c}.site-auth-copy.success{color:#047857}.site-auth-form{display:grid;gap:10px;min-inline-size:0;margin:0;padding:0;border:0}.site-auth-form label{display:grid;gap:5px;color:#1e293b;font-size:0.86rem;font-weight:700}.site-auth-form input{min-height:40px;width:100%;border:1px solid #cbd5e1;border-radius:4px;padding:8px 10px;color:#0f172a;background:#ffffff;font:inherit;font-weight:500}.site-auth-actions,.site-auth-session-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.site-auth-actions button,.site-auth-session-actions button{min-height:40px;border:1px solid #cbd5e1;border-radius:4px;padding:8px 10px;color:#0f172a;background:#ffffff;font:inherit;font-weight:760;cursor:pointer}.site-auth-actions button:first-child{border-color:var(--accent,#d7b56d);color:#0a0a10;background:var(--accent,#d7b56d)}.site-auth-actions button:disabled,.site-auth-session-actions button:disabled{cursor:wait;opacity:0.66}@media (max-width:760px){.topbar-actions{width:100%;justify-content:space-between}.site-auth{margin-left:auto}.site-auth.is-floating{top:10px;right:10px}body.stem-trainer-public .site-auth.is-floating{top:112px;right:12px}}:root{color-scheme:dark;--bg0:#0b0c0b;--bg1:#151613;--panel:rgba(16,17,15,0.88);--panel-solid:#10110f;--panel-soft:rgba(242,239,231,0.035);--panel-border:rgba(242,239,231,0.12);--text:#f2efe7;--muted:#b8b1a3;--accent:#d7b56d;--accent-2:#f0cf7f;--button:#d7b56d;--button-text:#0a0a10}[hidden]{display:none !important}body{color:var(--text);background:var(--bg0)}.shell{max-width:1180px;padding:24px 24px 56px}.topbar{max-width:1040px;margin:0 auto 42px}.brand,.nav-link,.nav-link:hover,.nav-link.active{color:var(--text)}.brand-dot{background:var(--accent);box-shadow:none}.nav-link{color:var(--muted)}.nav-link:hover,.nav-link.active{border-color:rgba(242,239,231,0.18);background:rgba(242,239,231,0.045)}.hero{max-width:980px;margin:0 auto 24px;text-align:center}.hero h1{max-width:780px;margin:0 auto 14px;font-size:clamp(2.35rem,5vw,3.7rem);line-height:1;letter-spacing:0}.summary{max-width:760px;margin:0 auto;color:var(--muted);font-size:clamp(1.05rem,2vw,1.28rem);line-height:1.5}.grid{display:block;max-width:860px;margin:0 auto}.packs-primary-card{padding:0;overflow:hidden;border-radius:6px;background:var(--panel);border:1px solid var(--panel-border);box-shadow:none;backdrop-filter:blur(16px)}.packs-primary-card>h2{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.packs-workspace,.packs-form,.packs-source-block,.packs-source-main,.packs-assist-body,.packs-account-panel,.packs-auth-form,.packs-grid,.packs-list{display:grid}.packs-workspace{padding:clamp(18px,3.2vw,34px)}.packs-form{gap:18px}.packs-source-block{gap:14px}.packs-source-heading{display:flex;align-items:center;justify-content:space-between;gap:16px}.packs-upload-title{color:var(--text);font-size:1.05rem;font-weight:760}.packs-mode-grid{display:inline-flex;flex-wrap:wrap;gap:8px;padding:4px;border-radius:6px;background:rgba(242,239,231,0.055)}.packs-mode-option{position:relative;display:inline-flex;align-items:center;justify-content:center;min-width:86px;border-radius:4px;color:var(--muted);cursor:pointer}.packs-mode-option input[type="radio"]{position:absolute;inset:0;margin:0;opacity:0;cursor:pointer}.packs-mode-option-title{display:inline-flex;align-items:center;justify-content:center;width:100%;padding:9px 16px;border-radius:4px;font-size:0.92rem;font-weight:760}.packs-mode-option:has(input[type="radio"]:checked) .packs-mode-option-title{color:var(--button-text);background:var(--button);box-shadow:none}.packs-source-main{gap:12px}.packs-upload-field,.packs-link-field{display:grid;place-items:center;gap:12px;min-height:270px;padding:clamp(24px,5vw,46px);border:2px dashed rgba(215,181,109,0.34);border-radius:6px;background:rgba(242,239,231,0.035);color:var(--text);text-align:center}.packs-upload-field.is-dragging{border-color:var(--accent);background:rgba(215,181,109,0.08)}.packs-file-input{position:absolute;width:1px;height:1px;overflow:hidden;opacity:0;pointer-events:none}.packs-drop-kicker{color:var(--accent);font-size:0.88rem;font-weight:700;letter-spacing:0.08em;text-transform:uppercase}.packs-drop-title{font-size:clamp(1.85rem,4vw,2.45rem);line-height:1.08;font-weight:760}.packs-drop-copy,.packs-field-help,.packs-inline-note,.packs-mode-copy{color:var(--muted);line-height:1.45}.packs-drop-copy{max-width:520px;font-size:1rem}.packs-drop-action,.packs-submit,.packs-result-link{display:inline-flex;align-items:center;justify-content:center;min-height:48px;border-radius:4px;font:inherit;font-weight:760;text-decoration:none}.packs-drop-action,.packs-submit{border:0;background:var(--button);color:var(--button-text);padding:12px 28px;box-shadow:0 12px 26px rgba(0,0,0,0.22);cursor:pointer}.packs-drop-action:hover,.packs-submit:hover{filter:brightness(0.98)}.packs-submit:disabled{cursor:not-allowed;opacity:0.62;filter:none;box-shadow:none}.packs-selected-file{min-height:1.35em;color:var(--text);font-size:0.94rem;font-weight:700}.packs-link-field{text-align:left;place-items:stretch}.packs-link-inner{display:grid;gap:14px;width:min(100%,620px);margin:0 auto}.packs-link-title{font-size:clamp(1.7rem,4vw,2.25rem);line-height:1.1;font-weight:760;text-align:center}.packs-form input:not([type="radio"]):not([type="file"]),.packs-form textarea{width:100%;border-radius:4px;border:1px solid rgba(242,239,231,0.14);background:rgba(16,17,15,0.72);color:var(--text);padding:13px 14px;font:inherit}.packs-form input:not([type="radio"]):not([type="file"]):focus,.packs-form textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 4px rgba(215,181,109,0.12)}.packs-assist{border-top:1px solid var(--panel-border);border-bottom:1px solid var(--panel-border)}.packs-assist>summary,.packs-details>summary{list-style:none;cursor:pointer}.packs-assist>summary::-webkit-details-marker,.packs-details>summary::-webkit-details-marker{display:none}.packs-assist-summary{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 0}.packs-assist-main{display:grid;gap:4px}.packs-assist-title{color:var(--text);font-weight:760}.packs-assist-copy{margin-top:4px;color:var(--muted);font-size:0.94rem}.packs-assist-action{color:var(--accent);font-weight:760;white-space:nowrap}.packs-assist-body{gap:14px;padding:0 0 18px}.packs-support-grid{display:grid;gap:14px}@media (min-width:760px){.packs-support-grid{grid-template-columns:minmax(0,1.35fr) minmax(230px,0.65fr)}}.packs-secondary-field{display:grid;gap:8px;color:var(--text);font-size:0.94rem;font-weight:700}.packs-secondary-field textarea{min-height:132px;resize:vertical}.packs-subtitle-box{display:grid;gap:8px;align-content:start;padding:14px;border:1px solid var(--panel-border);border-radius:4px;background:var(--panel-soft)}.packs-subtitle-box input[type="file"]{width:100%;color:var(--muted);font:inherit}.packs-subtitle-box input[type="file"]::file-selector-button{margin-right:8px;border:0;border-radius:7px;background:rgba(255,255,255,0.14);color:var(--text);font:inherit;font-weight:760;padding:8px 10px}.packs-footer-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px}.packs-actions,.packs-result-actions,.packs-list-item-links{display:flex;flex-wrap:wrap;align-items:center;gap:10px}.packs-status{min-height:1.4em;color:var(--muted);font-size:0.9rem;line-height:1.4}.packs-status.success{color:#98f0bf}.packs-status.error{color:#ffb1b1}.packs-account-panel,.packs-result{display:grid;gap:10px;padding:14px;border-radius:4px;border:1px solid var(--panel-border);background:var(--panel-soft)}.packs-account-top{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px}.packs-account-actions{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px}.packs-account-panel-title,.packs-result-title{color:var(--accent);font-size:0.76rem;font-weight:760;letter-spacing:0.09em;text-transform:uppercase}.packs-account-summary-meta,.packs-result-meta{color:var(--text);font-size:0.92rem;line-height:1.45}.packs-details{border-radius:4px;border:1px solid var(--panel-border);background:rgba(16,17,15,0.5)}.packs-details[hidden],.packs-result[hidden]{display:none}.packs-details>summary{padding:10px 12px;color:var(--text);font-size:0.92rem;font-weight:760}.packs-details-body{display:grid;gap:12px;padding:0 12px 12px}.packs-auth-form,.packs-deposit-form{gap:12px;border:0;padding:0;margin:0;min-inline-size:0}.packs-grid{gap:12px}.packs-grid label,.packs-deposit-form label{display:grid;gap:6px;color:var(--text);font-size:0.9rem;font-weight:700}.packs-submit-secondary,.packs-result-link{border:1px solid var(--panel-border);background:var(--panel-soft);color:var(--accent);box-shadow:none;padding:10px 14px}.packs-result-link[aria-disabled="true"]{pointer-events:none;opacity:0.55}.packs-list-item{padding:12px;border-radius:4px;border:1px solid var(--panel-border);background:var(--panel-soft)}.packs-list-item-title,.packs-ledger-delta{color:var(--text);font-weight:760}.packs-list-item-meta,.packs-list-empty{color:var(--muted);font-size:0.9rem;line-height:1.4}footer{max-width:860px;margin:24px auto 0;border-top-color:var(--panel-border);color:var(--muted)}.packs-sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.hidden-field{position:absolute;left:-99999px;opacity:0;pointer-events:none}@media (max-width:760px){.shell{padding:18px 14px 42px}.topbar{margin-bottom:34px;align-items:flex-start}nav{gap:6px}.nav-link{padding:6px 8px;font-size:0.92rem}.hero{margin-bottom:18px;text-align:left}.hero h1{font-size:2rem;line-height:1.04}.summary{margin:0;font-size:1rem}.packs-workspace{padding:16px}.packs-source-heading,.packs-footer-row,.packs-account-top,.packs-account-actions{align-items:stretch;flex-direction:column}.packs-mode-grid{display:grid;grid-template-columns:1fr 1fr;width:100%}.packs-mode-option{width:100%}.packs-upload-field,.packs-link-field{min-height:235px;padding:22px 16px}.packs-drop-title,.packs-link-title{font-size:1.82rem}.packs-submit,.packs-drop-action{width:100%}}