:root {
  color-scheme: dark;
  --background: #111820;
  --panel: #19232d;
  --panel-raised: #202c37;
  --line: #2b3945;
  --text: #e8edf0;
  --muted: #8d9ba4;
  --orange: #e5a247;
  --orange-light: #ffd28b;
  --green: #83b9a2;
  --red: #d98774;
  font-family: "Segoe UI", "Helvetica Neue", sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: radial-gradient(ellipse at 50% -20%, #263746 0, var(--background) 48%); color: var(--text); }
button, input, select { font: inherit; }
button { cursor: pointer; }
.topbar { height: 66px; padding: 0 max(28px, calc((100vw - 1120px) / 2)); display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid #ffffff0f; background: #111820d9; }
.brand { display: flex; align-items: center; gap: 12px; color: var(--text); font: 600 12px "Segoe UI", sans-serif; letter-spacing: 1.5px; text-decoration: none; }
.brand-mark { width: 31px; height: 31px; display: grid; place-items: center; color: #141a1e; background: var(--orange); font: 700 11px "DM Mono", monospace; letter-spacing: 0; }
.muted, .topbar-note { color: var(--muted); }
.topbar-note, .footer, .eyebrow, .tag, .mono { font-family: Consolas, "Courier New", monospace; font-size: 10px; letter-spacing: 1px; }
.status-dot { display: inline-block; height: 6px; width: 6px; margin-left: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 9px #83b9a2aa; }
.page-shell { max-width: 1040px; min-height: calc(100vh - 116px); margin: 0 auto; padding: 68px 28px 80px; }
.footer { min-height: 50px; display: flex; justify-content: space-between; gap: 16px; padding: 18px max(28px, calc((100vw - 1040px) / 2)); border-top: 1px solid #ffffff0d; color: #64737d; font-size: 9px; }
.loading { color: var(--muted); }
.hero { max-width: 665px; margin: 62px auto 42px; text-align: center; }
.eyebrow { color: var(--orange); text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { font-family: "Segoe UI", "Helvetica Neue", sans-serif; }
h1 { margin: 15px 0 14px; font-size: clamp(36px, 6vw, 57px); font-weight: 500; line-height: 1.04; letter-spacing: -2px; }
.hero p { max-width: 510px; margin: 0 auto; color: #9aa8b1; font-size: 15px; line-height: 1.75; }
.access-panel { max-width: 560px; margin: 0 auto; padding: 28px; border: 1px solid var(--line); background: linear-gradient(145deg, #1d2933, #151e26); box-shadow: 0 24px 70px #0003; }
.panel-heading { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 20px; }
.panel-heading h2 { margin: 0; font-size: 17px; font-weight: 500; }
.field-label { display: block; margin-bottom: 8px; color: #aab5bc; font: 10px "DM Mono", monospace; letter-spacing: 1.2px; text-transform: uppercase; }
.pin-row { display: flex; gap: 10px; }
input, select { width: 100%; min-height: 44px; border: 1px solid #34424d; border-radius: 2px; outline: none; background: #111920; color: var(--text); padding: 0 12px; }
input:focus, select:focus { border-color: var(--orange); box-shadow: 0 0 0 2px #e5a24725; }
input.pin-input { font: 16px Consolas, "Courier New", monospace; letter-spacing: 4px; text-transform: uppercase; }
.divider { height: 1px; margin: 23px 0; background: var(--line); }
.btn { display: inline-flex; min-height: 42px; align-items: center; justify-content: center; gap: 8px; padding: 0 16px; border: 1px solid transparent; border-radius: 2px; color: var(--text); background: var(--panel-raised); font-size: 12px; font-weight: 600; transition: .15s ease; }
.btn:hover { filter: brightness(1.13); transform: translateY(-1px); }
.btn:disabled { cursor: wait; opacity: .6; transform: none; }
.btn-primary { flex: 0 0 auto; color: #20170d; background: var(--orange); }
.btn-primary:hover { background: var(--orange-light); }
.btn-outline { border-color: #3a4853; background: transparent; }
.btn-danger { border-color: #72463e; color: #f0ad9d; background: #3b2623; }
.btn-quiet { color: #aeb8bf; background: transparent; border-color: transparent; }
.access-note { margin: 12px 0 0; color: #73818b; font-size: 11px; line-height: 1.6; }
.error-banner { margin: 15px 0 0; padding: 10px 12px; border-left: 2px solid var(--red); background: #d9877415; color: #f0b5a8; font-size: 12px; }
.session-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; padding-bottom: 27px; border-bottom: 1px solid var(--line); }
.session-head h1 { margin: 9px 0 0; font-size: clamp(31px, 5vw, 42px); letter-spacing: -1px; }
.session-head .eyebrow { display: flex; align-items: center; gap: 9px; }
.pin-badge { display: inline-flex; align-items: center; gap: 9px; padding: 10px 12px; border: 1px solid var(--line); background: #1b2630; }
.pin-badge strong { font: 16px "DM Mono", monospace; letter-spacing: 2px; color: var(--orange-light); }
.pin-badge span { color: var(--muted); font-size: 10px; text-transform: uppercase; }
.tools-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin: 25px 0 38px; }
.tool-card { display: flex; flex-direction: column; min-height: 180px; padding: 19px; border: 1px solid var(--line); background: linear-gradient(140deg, #202c37, #19232c); }
.tool-number { margin-bottom: 18px; color: var(--orange); font: 11px Consolas, "Courier New", monospace; }
.tool-card h2 { margin: 0 0 7px; font-size: 15px; line-height: 1.35; font-weight: 500; }
.tool-card p { flex: 1; margin: 0 0 19px; color: var(--muted); font-size: 11px; line-height: 1.55; }
.tool-card .btn { width: 100%; min-height: 36px; font-size: 11px; }
.section-heading { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 14px; }
.section-heading h2 { margin: 0; font-size: 18px; font-weight: 500; }
.result-count { color: var(--muted); font: 10px "DM Mono", monospace; }
.results-list { display: grid; gap: 9px; }
.result-card { overflow: hidden; border: 1px solid var(--line); background: #18222b; }
.result-card summary { display: flex; align-items: center; gap: 14px; min-height: 61px; padding: 12px 16px; cursor: pointer; list-style: none; }
.result-card summary::-webkit-details-marker { display: none; }
.result-card summary::after { content: "+"; margin-left: auto; color: var(--orange); font: 16px "DM Mono", monospace; }
.result-card[open] summary::after { content: "−"; }
.result-serial { color: var(--orange); font: 10px Consolas, "Courier New", monospace; }
.result-summary { flex: 1; }
.result-title { display: block; font-size: 13px; font-weight: 600; }
.result-meta { display: block; margin-top: 5px; color: var(--muted); font-size: 10px; }
.result-detail { padding: 16px 21px 19px 48px; border-top: 1px solid var(--line); color: #aeb9c0; font-size: 12px; line-height: 1.7; white-space: pre-wrap; overflow-wrap: anywhere; }
.empty-state { padding: 32px 18px; border: 1px dashed #34434e; color: var(--muted); text-align: center; font-size: 12px; }
.admin-panel { margin-top: 36px; padding: 19px; border: 1px solid #3c4650; background: #1a232b; }
.admin-panel .section-heading { margin-bottom: 14px; }
.admin-panel h2 { margin: 0; font-size: 15px; font-weight: 500; }
.admin-actions { display: flex; flex-wrap: wrap; gap: 9px; }
.lock-note { align-self: center; margin-left: auto; color: var(--muted); font-size: 11px; }
.overlay { position: fixed; inset: 0; z-index: 4; display: grid; place-items: center; padding: 22px; background: #080d12d9; }
.dialog { width: min(460px, 100%); padding: 26px; border: 1px solid #40505c; background: #19232d; box-shadow: 0 25px 80px #0008; }
.dialog h2 { margin-bottom: 8px; font-size: 20px; }
.dialog p { color: var(--muted); font-size: 12px; line-height: 1.6; }
.dialog-fields { display: grid; grid-template-columns: 1fr; gap: 8px; margin: 18px 0; }
.check-row { display: flex; align-items: center; gap: 9px; color: #aab5bc; font-size: 12px; text-transform: none; letter-spacing: 0; }
.check-row input[type="checkbox"] { width: auto; min-height: auto; margin: 0; accent-color: var(--orange); }
.dialog-actions { display: flex; justify-content: flex-end; gap: 9px; }
.toast { position: fixed; right: 24px; bottom: 24px; z-index: 5; max-width: min(420px, calc(100vw - 48px)); padding: 13px 17px; border: 1px solid #41524c; background: #21332d; color: #d8ede2; font-size: 12px; opacity: 0; transform: translateY(10px); pointer-events: none; transition: .18s ease; }
.toast.visible { opacity: 1; transform: translateY(0); }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

@media (max-width: 830px) {
  .tools-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
  .topbar { padding: 0 17px; }
  .topbar-note { font-size: 8px; }
  .page-shell { padding: 42px 17px 58px; }
  .hero { margin: 40px auto 30px; }
  .access-panel { padding: 21px; }
  .pin-row { flex-direction: column; }
  .pin-row .btn { width: 100%; }
  .session-head { align-items: flex-start; flex-direction: column; }
  .tools-grid { gap: 8px; }
  .tool-card { min-height: 175px; padding: 14px; }
  .tool-card h2 { font-size: 13px; }
  .tool-card p { font-size: 10px; }
  .result-card summary { gap: 9px; padding: 12px; }
  .result-detail { padding: 14px; }
  .footer { padding: 15px 17px; flex-direction: column; gap: 8px; font-size: 8px; }
  .lock-note { width: 100%; margin: 4px 0 0; }
  .dialog-fields { grid-template-columns: 1fr; }
}