:root {
  --bg: #0a0f0a;
  --bg-elevated: #121a12;
  --bg-card: #1a241a;
  --fg: #e8f0e8;
  --fg-muted: #8fa88f;
  --fg-dim: #5a725a;
  --accent: #4ade80;
  --accent-glow: rgba(74, 222, 128, 0.15);
  --accent-strong: #22c55e;
  --warm: #fbbf24;
  --radius: 16px;
  --radius-sm: 10px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'DM Sans', sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ---- HERO ---- */
.hero {
  min-height: 90vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 80px 40px 60px;
  max-width: 900px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(74, 222, 128, 0.25);
  padding: 8px 18px;
  border-radius: 100px;
  margin-bottom: 40px;
  width: fit-content;
}

.hero h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(42px, 7vw, 80px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -2px;
  margin-bottom: 28px;
}

.hero h1 .accent {
  color: var(--accent);
}

.lede {
  font-size: 19px;
  color: var(--fg-muted);
  max-width: 540px;
  margin-bottom: 50px;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 28px 32px;
  background: var(--bg-elevated);
  border: 1px solid rgba(74, 222, 128, 0.1);
  border-radius: var(--radius);
  width: fit-content;
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  font-size: 13px;
  color: var(--fg-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: rgba(74, 222, 128, 0.15);
}

/* ---- PROBLEM ---- */
.problem {
  padding: 100px 40px;
  max-width: 1000px;
  margin: 0 auto;
}

.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.problem h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.problem p {
  color: var(--fg-muted);
  margin-bottom: 16px;
}

.problem-emphasis {
  color: var(--fg) !important;
  font-weight: 500;
  font-size: 18px;
  margin-top: 8px;
}

.problem-emphasis em {
  color: var(--accent);
  font-style: normal;
  font-weight: 600;
}

.problem-visual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  position: relative;
}

.problem-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-sm);
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--fg-dim);
  text-align: center;
}

.problem-icon {
  font-size: 28px;
}

.problem-arrow {
  grid-column: 1 / -1;
  text-align: center;
  font-size: 28px;
  color: var(--accent);
  padding: 4px 0;
}

.solution-card {
  grid-column: 1 / -1;
  background: var(--accent-glow);
  border-color: rgba(74, 222, 128, 0.3);
  color: var(--accent);
  font-weight: 600;
  font-size: 16px;
}

/* ---- FEATURES ---- */
.features {
  padding: 100px 40px;
  max-width: 1000px;
  margin: 0 auto;
}

.features h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 48px;
  letter-spacing: -1px;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.feature-card {
  background: var(--bg-elevated);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius);
  padding: 36px 32px;
  transition: border-color 0.3s ease;
}

.feature-card:hover {
  border-color: rgba(74, 222, 128, 0.2);
}

.feature-large {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--bg-elevated) 0%, rgba(74, 222, 128, 0.05) 100%);
  border-color: rgba(74, 222, 128, 0.12);
}

.feature-number {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 1px;
  margin-bottom: 14px;
}

.feature-card h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 10px;
  letter-spacing: -0.5px;
}

.feature-card p {
  color: var(--fg-muted);
  font-size: 15px;
  line-height: 1.6;
}

/* ---- HOW ---- */
.how {
  padding: 100px 40px;
  max-width: 800px;
  margin: 0 auto;
}

.how h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 48px;
  letter-spacing: -1px;
  text-align: center;
}

.how-steps {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.how-step {
  text-align: center;
  max-width: 400px;
}

.step-marker {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--bg);
  background: var(--accent);
  display: inline-block;
  padding: 6px 24px;
  border-radius: 100px;
  margin-bottom: 16px;
}

.how-step p {
  color: var(--fg-muted);
  font-size: 16px;
}

.how-connector {
  width: 2px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  margin: 12px 0;
}

/* ---- CLOSING ---- */
.closing {
  padding: 120px 40px;
  text-align: center;
}

.closing-content {
  max-width: 680px;
  margin: 0 auto;
}

.closing h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: -1.5px;
}

.closing p {
  color: var(--fg-muted);
  font-size: 18px;
  margin-bottom: 32px;
}

.closing-tagline {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
}

/* ---- FOOTER ---- */
.site-footer {
  padding: 40px;
  border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-inner {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 18px;
  color: var(--fg);
}

.footer-copy {
  font-size: 13px;
  color: var(--fg-dim);
}

/* ---- CTA BUTTON ---- */
.hero-cta {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-block;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: var(--bg);
  background: var(--accent);
  padding: 14px 32px;
  border-radius: 100px;
  text-decoration: none;
  letter-spacing: -0.3px;
  transition: background 0.2s ease, transform 0.15s ease;
}

.btn-primary:hover {
  background: var(--accent-strong);
  transform: translateY(-1px);
}

.cta-sub {
  font-size: 14px;
  color: var(--fg-dim);
}

/* ---- APP NAV ---- */
.app-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 32px;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}

.app-nav-brand {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 20px;
  color: var(--fg);
  text-decoration: none;
}

.app-nav-brand span {
  color: var(--accent);
}

/* ---- APP LAYOUT ---- */
.app-shell {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 24px 80px;
}

.app-header {
  margin-bottom: 32px;
}

.app-header h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.8px;
  margin-bottom: 6px;
}

.app-header p {
  color: var(--fg-muted);
  font-size: 15px;
}

/* ---- ADD ITEM FORM ---- */
.add-form {
  display: flex;
  gap: 10px;
  margin-bottom: 32px;
}

.add-input {
  flex: 1;
  background: var(--bg-elevated);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-family: 'DM Sans', sans-serif;
  font-size: 16px;
  color: var(--fg);
  outline: none;
  transition: border-color 0.2s;
}

.add-input::placeholder {
  color: var(--fg-dim);
}

.add-input:focus {
  border-color: var(--accent);
}

.btn-add {
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px 20px;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
}

.btn-add:hover {
  background: var(--accent-strong);
}

/* ---- LIST SECTIONS ---- */
.list-section {
  margin-bottom: 32px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.section-label {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--fg-dim);
}

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

.btn-predict {
  background: transparent;
  border: 1px solid rgba(74, 222, 128, 0.3);
  color: var(--accent);
  border-radius: 100px;
  padding: 6px 16px;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.5px;
  transition: background 0.2s, border-color 0.2s;
}

.btn-predict:hover {
  background: var(--accent-glow);
  border-color: rgba(74, 222, 128, 0.5);
}

.btn-predict:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ---- LIST ITEMS ---- */
.item-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.item-row {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-elevated);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  transition: border-color 0.2s, opacity 0.2s;
}

.item-row.is-predicted {
  border-color: rgba(74, 222, 128, 0.12);
  background: linear-gradient(90deg, var(--bg-elevated) 0%, rgba(74,222,128,0.03) 100%);
}

.item-row.is-checked {
  opacity: 0.45;
}

.item-check {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255,255,255,0.15);
  border-radius: 50%;
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s, background 0.2s;
}

.item-check:hover {
  border-color: var(--accent);
}

.item-check.checked {
  background: var(--accent);
  border-color: var(--accent);
}

.item-check.checked::after {
  content: '✓';
  font-size: 11px;
  color: var(--bg);
  font-weight: 700;
}

.item-body {
  flex: 1;
  min-width: 0;
}

.item-name {
  font-size: 15px;
  font-weight: 500;
  color: var(--fg);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.item-name.checked {
  text-decoration: line-through;
  color: var(--fg-dim);
}

.item-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 2px;
}

.item-category {
  font-size: 12px;
  color: var(--fg-dim);
}

.item-confidence {
  font-size: 11px;
  color: var(--accent);
  opacity: 0.7;
}

.item-delete {
  background: none;
  border: none;
  color: var(--fg-dim);
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 4px;
  font-size: 16px;
  opacity: 0;
  transition: opacity 0.15s, color 0.15s;
  flex-shrink: 0;
}

.item-row:hover .item-delete {
  opacity: 1;
}

.item-delete:hover {
  color: #f87171;
}

/* ---- EMPTY STATE ---- */
.empty-state {
  text-align: center;
  padding: 40px 24px;
  color: var(--fg-dim);
  font-size: 15px;
}

.empty-state .empty-icon {
  font-size: 36px;
  margin-bottom: 12px;
}

/* ---- ACTIONS BAR ---- */
.actions-bar {
  display: flex;
  gap: 10px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.05);
  flex-wrap: wrap;
}

.btn-secondary {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--fg-muted);
  border-radius: var(--radius-sm);
  padding: 10px 20px;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}

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

/* ---- TOAST ---- */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--bg-card);
  border: 1px solid rgba(74,222,128,0.2);
  color: var(--fg);
  padding: 12px 24px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 500;
  z-index: 100;
  transition: transform 0.3s ease;
  white-space: nowrap;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

/* ---- RESPONSIVE ---- */
@media (max-width: 768px) {
  .hero {
    padding: 60px 24px 40px;
    min-height: 80vh;
  }

  .hero h1 {
    letter-spacing: -1px;
  }

  .lede {
    font-size: 17px;
  }

  .hero-stats {
    flex-direction: column;
    gap: 20px;
    align-items: flex-start;
    width: 100%;
  }

  .stat-divider {
    width: 100%;
    height: 1px;
  }

  .problem {
    padding: 60px 24px;
  }

  .problem-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .features {
    padding: 60px 24px;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .feature-large {
    grid-column: 1;
  }

  .how {
    padding: 60px 24px;
  }

  .closing {
    padding: 80px 24px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}