:root {
  --accent: #60a5fa;
  --accent-dim: #2563eb;
  --s-bg: #0d1b2a;
  --s-bg2: #0a1628;
  --s-surface: rgba(26, 58, 92, 0.35);
  --s-border: #1e3a5f;
  --s-text: #e2e8f0;
  --s-muted: #94a3b8;
  --white: #ffffff;
  --light-bg: #f8fafc;
  --text: #111827;
  --text-muted: #6b7280;
  --b-light: #e5e7eb;
  --radius: 8px;
  --max-w: 900px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Poppins", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.65;
  font-size: 15px;
}

.nav-tabs {
  display: inline-flex;
  gap: 0;
  padding: 4px;
  max-width: 100%;
  margin-bottom: 2.25rem;
  border: 1px solid #d7dee8;
  border-radius: 999px;
  background: var(--white);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
  overflow-x: auto;
}

.tab-button {
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: #64748b;
  cursor: pointer;
  font: inherit;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.28rem 0.78rem;
  transition: background 0.16s ease, color 0.16s ease;
  white-space: nowrap;
}

.tab-button:hover,
.tab-button.active {
  background: #eff6ff;
  color: #2563eb;
}

.hero {
  background: var(--s-bg);
  border-bottom: 1px solid var(--s-border);
  padding: 70px 2rem 66px;
}

.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 2.5rem;
  align-items: center;
}

.section-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.45rem;
}

.accent-label {
  color: var(--accent);
}

.dim-label {
  color: var(--text-muted);
}

h1 {
  color: var(--s-text);
  font-size: 2.1rem;
  line-height: 1.15;
  font-weight: 700;
  margin-bottom: 0.85rem;
}

h2 {
  color: var(--text);
  font-size: 1.45rem;
  line-height: 1.25;
  font-weight: 700;
  margin-bottom: 1rem;
}

.hero-copy {
  color: var(--s-muted);
  max-width: 620px;
  font-size: 0.95rem;
  margin-bottom: 1.45rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0.55rem 1.15rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.16s ease, border-color 0.16s ease, color 0.16s ease;
}

.btn-primary {
  color: #fff;
  background: var(--accent-dim);
}

.btn-primary:hover {
  background: #1d4ed8;
}

.btn-outline {
  color: var(--s-text);
  border: 1px solid var(--s-border);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.hero-panel {
  padding: 1.1rem;
  border: 1px solid var(--s-border);
  border-radius: var(--radius);
  background: rgba(10, 22, 40, 0.55);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.18);
}

.input-row,
.prediction {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--s-muted);
  font-size: 0.78rem;
}

.password-line {
  color: var(--s-text);
  font-weight: 600;
}

.meter {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.35rem;
  margin: 1rem 0;
}

.meter span {
  height: 7px;
  border-radius: 999px;
  background: #1e3a5f;
  overflow: hidden;
}

.meter span::after {
  content: "";
  display: block;
  width: 100%;
  height: 100%;
  background: var(--accent);
  animation: fill-meter 1.2s ease both;
}

.meter span:nth-child(2)::after {
  animation-delay: 0.16s;
}

.meter span:nth-child(3)::after {
  animation-delay: 0.32s;
}

.prediction strong {
  color: var(--accent);
  font-size: 1rem;
}

.token-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.32rem;
  margin-top: 0.95rem;
}

.token-strip span {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border: 1px solid rgba(96, 165, 250, 0.28);
  border-radius: 6px;
  background: rgba(96, 165, 250, 0.1);
  color: var(--s-text);
  font-size: 0.72rem;
  font-weight: 600;
}

.tabs-shell {
  max-width: var(--max-w);
  min-height: 520px;
  margin: 0 auto;
  padding: 56px 2rem 64px;
}

.tab-panel {
  display: none;
  animation: panel-in 0.28s ease both;
}

.tab-panel.active {
  display: block;
}

.panel-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.78fr);
  gap: 2rem;
  align-items: start;
}

.copy-block p {
  color: var(--text-muted);
  font-size: 0.94rem;
  margin-bottom: 1rem;
}

.copy-block p:last-child {
  margin-bottom: 0;
}

.narrow {
  max-width: 620px;
  margin-bottom: 1.6rem;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.stat-card,
.chart-card,
.metric-table,
.class-card,
.repo-card,
.code-card,
.model-card,
.cv-table,
.flow-step {
  border: 1px solid var(--b-light);
  border-radius: var(--radius);
  background: var(--light-bg);
}

.stat-card {
  padding: 1rem;
}

.stat-card span,
.repo-card span {
  display: block;
  color: var(--text-muted);
  font-size: 0.76rem;
  margin-bottom: 0.25rem;
}

.stat-card strong {
  color: var(--text);
  font-size: 1.25rem;
}

.flow-diagram {
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, minmax(130px, 1fr));
  gap: 0.75rem;
}

.compact-flow {
  grid-template-columns: repeat(4, minmax(130px, 1fr));
  margin-top: 2rem;
}

.flow-step {
  position: relative;
  padding: 1rem;
  min-height: 160px;
  overflow: hidden;
}

.flow-step::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, transparent, rgba(96, 165, 250, 0.12), transparent);
  transform: translateX(-100%);
  animation: sweep 3.4s ease-in-out infinite;
}

.flow-step span {
  color: var(--accent-dim);
  font-size: 0.75rem;
  font-weight: 700;
}

.flow-step strong {
  display: block;
  margin: 0.45rem 0;
}

.flow-step p {
  position: relative;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.results-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.95fr);
  gap: 1rem;
}

.chart-card,
.metric-table,
.class-card,
.repo-card {
  padding: 1.1rem;
}

.class-card {
  overflow: hidden;
}

.bar-row,
.class-row {
  display: grid;
  grid-template-columns: 150px minmax(120px, 1fr) 70px;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 0.9rem;
  font-size: 0.84rem;
}

.class-row {
  grid-template-columns: minmax(78px, 1fr) minmax(70px, 120px) minmax(52px, max-content);
  gap: 0.65rem;
}

.class-row span {
  min-width: 0;
}

.bar-row:last-child,
.class-row:last-child {
  margin-bottom: 0;
}

.bar-track,
.class-track {
  height: 8px;
  border-radius: 999px;
  background: #e5e7eb;
  overflow: hidden;
}

.class-track {
  width: 100%;
  min-width: 70px;
  max-width: 120px;
}

.bar-fill,
.class-track div {
  width: var(--value);
  height: 100%;
  border-radius: 999px;
  background: var(--accent-dim);
  animation: grow-bar 0.8s ease both;
}

.bar-fill.best {
  background: var(--accent);
}

.bar-row strong,
.class-row strong {
  text-align: right;
  font-size: 0.82rem;
}

.class-row strong {
  justify-self: end;
  min-width: 52px;
  font-variant-numeric: tabular-nums;
}

.metric-table {
  display: grid;
  gap: 0.55rem;
}

.metric-table div {
  display: grid;
  grid-template-columns: 1fr 0.75fr 0.75fr 0.75fr;
  gap: 0.6rem;
  align-items: center;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.metric-table div:first-child {
  color: var(--text);
  font-weight: 700;
}

.repo-card strong {
  display: block;
  color: var(--text);
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.repo-card p {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.university-card img {
  display: block;
  width: 100%;
  max-width: 300px;
  margin-bottom: 1rem;
  padding: 0.9rem 1rem;
  border-radius: var(--radius);
  background: var(--s-bg);
  border: 1px solid var(--s-border);
}

.data-notes {
  display: grid;
  gap: 0.35rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--b-light);
  color: var(--text-muted);
  font-size: 0.78rem;
}

.code-card {
  padding: 1rem;
  overflow: hidden;
}

.code-card span {
  display: block;
  color: var(--text-muted);
  font-size: 0.76rem;
  margin-bottom: 0.7rem;
}

.code-card pre {
  overflow-x: auto;
  color: var(--s-text);
  background: var(--s-bg2);
  border: 1px solid var(--s-border);
  border-radius: var(--radius);
  padding: 0.9rem;
  font-size: 0.78rem;
  line-height: 1.55;
}

.feature-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.5rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--b-light);
  border-radius: var(--radius);
  background: var(--white);
}

.feature-strip > span {
  color: var(--text-muted);
  font-size: 0.76rem;
}

.feature-strip strong {
  font-size: 0.88rem;
}

.inline-strip {
  margin: 0;
}

.inline-strip span {
  color: var(--accent-dim);
  background: #eff6ff;
  border-color: #bfdbfe;
}

.model-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
}

.model-card {
  min-height: 190px;
  padding: 1rem;
}

.model-card span {
  display: block;
  color: var(--text-muted);
  font-size: 0.76rem;
  margin-bottom: 0.45rem;
}

.model-card strong {
  display: block;
  margin-bottom: 0.7rem;
  color: var(--text);
  font-size: 1rem;
}

.model-card p {
  color: var(--text-muted);
  font-size: 0.84rem;
}

.cv-table {
  display: grid;
  gap: 0.6rem;
  padding: 1rem;
  overflow-x: auto;
}

.cv-table div {
  display: grid;
  grid-template-columns: 1.2fr repeat(4, minmax(105px, 0.75fr));
  gap: 0.75rem;
  align-items: center;
  min-width: 720px;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.cv-table div:first-child {
  color: var(--text);
  font-weight: 700;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem 2rem;
  border-top: 1px solid var(--s-border);
  background: var(--s-bg);
  color: var(--s-muted);
  font-size: 0.8rem;
}

@keyframes panel-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes grow-bar {
  from {
    width: 0;
  }
  to {
    width: var(--value);
  }
}

@keyframes fill-meter {
  from {
    transform: translateX(-100%);
  }
  to {
    transform: translateX(0);
  }
}

@keyframes sweep {
  45%,
  100% {
    transform: translateX(100%);
  }
}

@media (max-width: 860px) {
  .nav-tabs {
    width: 100%;
  }

  .hero-inner,
  .panel-grid,
  .results-grid {
    grid-template-columns: 1fr;
  }

  .flow-diagram {
    grid-template-columns: 1fr;
  }

  .compact-flow,
  .model-grid {
    grid-template-columns: 1fr;
  }

  .bar-row,
  .class-row {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }

  .bar-row strong,
  .class-row strong {
    text-align: left;
  }

  footer {
    flex-direction: column;
  }
}