:root {
  --brand: #0f766e;
  --brand-700: #115e59;
  --accent: #1d4ed8;
  --ink: #111827;
  --ink-2: #374151;
  --muted: #64748b;
  --bg: #ffffff;
  --bg-soft: #f4f7f7;
  --card: #ffffff;
  --border: #e3e8f2;
  --ok: #10b981;
  --warn: #f59e0b;
  --danger: #dc2626;
  --shadow: 0 16px 42px rgba(15, 23, 42, 0.09);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}

body {
  min-height: 100vh;
}

a {
  color: var(--brand);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

code {
  padding: 2px 6px;
  border-radius: 7px;
  background: #eef4ff;
  color: #163c74;
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(1.5) blur(12px);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px;
  max-width: 1180px;
  margin: 0 auto;
}

.logo-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.14), 0 0 28px rgba(16, 185, 129, 0.52);
}

.brand {
  font-family: system-ui, -apple-system, Segoe UI, sans-serif;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0;
  color: var(--ink);
}

.cta {
  margin-left: auto;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0;
}

.hero {
  position: relative;
  overflow: hidden;
  background: #eef7f5;
  border-bottom: 1px solid #cfe4df;
  padding: 42px 0 12px;
}

.hero h1 {
  font-family: system-ui, -apple-system, Segoe UI, sans-serif;
  font-size: 56px;
  line-height: 1.03;
  letter-spacing: 0;
  margin: 12px 0 16px;
}

.hero p,
.lead {
  color: var(--ink-2);
  max-width: 870px;
  font-size: 18px;
  line-height: 1.65;
}

.pillrow {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 8px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.82);
  padding: 5px 11px;
  border-radius: 999px;
  font-size: 12px;
  color: var(--muted);
  font-weight: 800;
}

.badge.ok {
  border-color: rgba(16, 185, 129, 0.25);
  color: #047857;
  background: #ecfdf5;
}

.badge.key {
  border-color: rgba(29, 78, 216, 0.24);
  color: var(--accent);
  background: #eef2ff;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--ink);
  font-weight: 800;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
  text-decoration: none;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 28px rgba(26, 115, 232, 0.13);
  text-decoration: none;
}

.btn.primary {
  background: var(--brand);
  color: #fff;
  border-color: var(--brand);
}

.btn.primary:hover {
  background: var(--brand-700);
}

.btn.danger {
  color: #fff;
  background: var(--danger);
  border-color: var(--danger);
}

.video-card,
.panel,
.card,
.tool-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.video-card {
  overflow: hidden;
}

.video-wrap {
  position: relative;
  background: #000;
}

video {
  display: block;
  width: 100%;
  height: auto;
}

.vid-controls {
  position: absolute;
  left: 16px;
  bottom: 16px;
  display: flex;
  gap: 10px;
}

.iconbtn {
  border: none;
  background: rgba(255, 255, 255, 0.92);
  color: var(--ink);
  padding: 10px 13px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.17);
}

.caption {
  padding: 14px 18px;
  font-size: 14px;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 18px;
}

.card,
.tool-card,
.panel {
  padding: 20px;
}

.card {
  grid-column: span 12;
}

.card h3,
.tool-card h2,
.section-title {
  font-family: system-ui, -apple-system, Segoe UI, sans-serif;
}

.card h3 {
  margin: 4px 0 8px;
  font-size: 22px;
}

.card p,
.tool-card p,
.panel p {
  color: var(--ink-2);
  line-height: 1.65;
}

.list {
  margin: 10px 0 0;
  padding-left: 20px;
  color: var(--ink-2);
}

.list li {
  margin: 7px 0;
}

.actions {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.section-title {
  font-size: 28px;
  margin: 24px 0 8px;
}

.sub {
  color: var(--muted);
  font-size: 14px;
  margin-top: 0;
}

.tool-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  align-items: start;
}

.tool-card {
  min-width: 0;
}

label {
  display: block;
  font-weight: 800;
  color: var(--ink);
  margin: 13px 0 7px;
}

input[type="password"],
input[type="text"],
input[type="file"],
textarea,
select {
  width: 100%;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--ink);
  border-radius: 6px;
  padding: 11px 12px;
  font: inherit;
}

textarea {
  min-height: 140px;
  resize: vertical;
}

.help {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.55;
  margin-top: 6px;
}

.status {
  margin-top: 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  padding: 12px;
  color: var(--ink-2);
  min-height: 48px;
  white-space: pre-wrap;
}

.status.ok {
  border-color: rgba(16, 185, 129, 0.28);
  background: #ecfdf5;
  color: #065f46;
}

.status.warn {
  border-color: rgba(245, 158, 11, 0.3);
  background: #fffbeb;
  color: #92400e;
}

.status.err {
  border-color: rgba(220, 38, 38, 0.25);
  background: #fef2f2;
  color: #991b1b;
}

.mode-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 16px;
}

.metric {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px;
  background: #fff;
}

.metric strong {
  display: block;
  font-size: 24px;
  letter-spacing: 0;
}

.metric span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.notice {
  border-left: 4px solid var(--brand);
  background: #eef2ff;
  color: #1e3a8a;
  border-radius: 14px;
  padding: 14px 16px;
  line-height: 1.6;
}

.auto-console {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.8fr);
  gap: 20px;
  padding: 22px;
  border: 1px solid #b8d8cf;
  border-left: 5px solid #087f5b;
  border-radius: 8px;
  background: #f3fbf8;
}

.auto-console h2 {
  margin: 10px 0 6px;
  font-family: system-ui, -apple-system, Segoe UI, sans-serif;
  font-size: 26px;
}

.auto-console p {
  margin: 0;
  color: var(--ink-2);
  line-height: 1.55;
}

.auto-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  align-content: start;
}

.auto-actions .btn {
  min-height: 44px;
  text-align: center;
}

.file-button {
  margin: 0;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.auto-toggle {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  padding-top: 4px;
}

.auto-toggle input {
  width: 18px;
  height: 18px;
}

.auto-state {
  grid-column: 1 / -1;
  min-height: 44px;
  padding: 11px 12px;
  border: 1px solid #cbd5e1;
  border-radius: 6px;
  background: #fff;
  color: #334155;
}

.auto-state[data-state="ready"] {
  border-color: #7fc6ae;
  color: #065f46;
}

.auto-state[data-state="error"] {
  border-color: #efb4b4;
  color: #991b1b;
}

.auto-warning {
  grid-column: 1 / -1;
  font-size: 13px;
  color: #6b3f00 !important;
}

.auto-profile {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
  padding: 12px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  background: #fff;
}

.auto-profile img {
  width: 88px;
  height: 88px;
  object-fit: cover;
  border: 1px solid #94a3b8;
  border-radius: 6px;
  image-rendering: pixelated;
}

.auto-profile img[hidden] + div {
  grid-column: 1 / -1;
}

.auto-profile strong,
.auto-profile span {
  display: block;
}

.auto-profile span {
  margin-top: 5px;
  color: var(--muted);
  font-size: 13px;
  overflow-wrap: anywhere;
}

#zmathAutoSelfTestResult[data-state="passed"] {
  color: #047857;
  font-weight: 800;
}

.recovery-panel {
  grid-column: 1 / -1;
  padding: 16px;
  border: 2px solid #d97706;
  border-radius: 8px;
  background: #fffbeb;
  color: #78350f;
}

.recovery-panel code {
  display: block;
  margin: 10px 0;
  padding: 12px;
  border: 1px solid #f59e0b;
  border-radius: 6px;
  background: #fff;
  color: #111827;
  font-size: 17px;
  font-weight: 800;
  overflow-wrap: anywhere;
  user-select: all;
}

.auto-advanced {
  grid-column: 1 / -1;
  border-top: 1px solid #b8d8cf;
  padding-top: 12px;
}

.auto-advanced summary {
  cursor: pointer;
  color: var(--brand-700);
  font-weight: 800;
}

.advanced-grid {
  display: grid;
  grid-template-columns: minmax(180px, 0.36fr) minmax(0, 1fr);
  gap: 10px 14px;
  align-items: center;
  margin-top: 12px;
}

.advanced-grid label {
  margin: 0;
}

.advanced-grid .btn {
  width: 100%;
  margin: 0;
}

footer {
  margin-top: 36px;
  padding: 26px 0;
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}

.footer-inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
}

@media (min-width: 860px) {
  .card.half {
    grid-column: span 6;
  }
}

@media (max-width: 760px) {
  .hero h1 {
    font-size: 38px;
  }

  .auto-console {
    grid-template-columns: 1fr;
    padding: 16px;
  }

  .auto-actions {
    grid-template-columns: 1fr;
  }

  .auto-profile,
  .advanced-grid {
    grid-template-columns: 1fr;
  }

  .auto-profile img {
    width: 112px;
    height: 112px;
  }
}

@media (max-width: 760px) {
  .nav-inner,
  .cta,
  .tool-grid,
  .mode-strip {
    display: flex;
    flex-direction: column;
    align-items: stretch;
  }

  .cta {
    margin-left: 0;
    width: 100%;
  }

  .btn {
    width: 100%;
  }

  .vid-controls {
    position: static;
    padding: 10px;
    background: #0b1020;
  }
}