/* ============================================
   OmniViz — Stylesheet
   Pure white, compact, formal, modern
   ============================================ */

:root {
  --bg: #FFFFFF;
  --bg-alt: #F7F8FA;
  --surface: #FFFFFF;
  --text: #111827;
  --text-secondary: #4B5563;
  --text-muted: #9CA3AF;
  --accent: #0D7C66;
  --accent-light: #ECFDF5;
  --accent-dark: #095E4D;
  --accent-hover: #0A6B58;
  --border: #E5E7EB;
  --border-light: #F3F4F6;
  --danger: #DC2626;
  --success: #059669;
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.03);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow: 0 2px 8px rgba(0,0,0,0.07);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 20px rgba(0,0,0,0.08);
  --radius: 8px;
  --radius-lg: 12px;
  --radius-sm: 6px;
  --transition: 0.2s ease;
  --font: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--accent-hover); }

.hidden { display: none !important; }

/* --- Toast --- */
#toast-container {
  position: fixed;
  top: 60px;
  right: 16px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  color: #fff;
  transform: translateX(140%);
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  max-width: 340px;
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  line-height: 1.4;
}
.toast.show { transform: translateX(0); }
.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }
.toast-info { background: var(--accent); }

/* --- Header --- */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.5px;
  cursor: pointer;
}
.logo:hover { color: var(--text); }
.logo-accent { color: var(--accent); }

.nav-links { display: flex; gap: 4px; }

.nav-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 5px 12px;
  border-radius: 100px;
  transition: all var(--transition);
}
.nav-link:hover {
  color: var(--accent);
  background: var(--accent-light);
}

/* --- Hero --- */
#hero {
  padding: 60px 20px 48px;
  text-align: center;
  max-width: 1100px;
  margin: 0 auto;
}

.hero-content {
  max-width: 600px;
  margin: 0 auto;
}

.hero-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-light);
  padding: 4px 12px;
  border-radius: 100px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.hero-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -1px;
  color: var(--text);
  margin-bottom: 14px;
}

.hero-subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 480px;
  margin: 0 auto 28px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 700;
  padding: 10px 24px;
  border: none;
  border-radius: 100px;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 3px 10px rgba(13,124,102,0.25);
}
.hero-cta:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 5px 16px rgba(13,124,102,0.3);
}

/* --- Sections --- */
#features-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px 0;
}

#workspace {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 20px 48px;
}

.section-header {
  text-align: center;
  margin-bottom: 28px;
}

.section-title {
  font-size: clamp(1.3rem, 2.5vw, 1.6rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 6px;
}

.section-subtitle {
  font-size: 14px;
  color: var(--text-muted);
}

/* --- Features Grid --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.feature-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 18px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.feature-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--accent-light);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  margin-bottom: 12px;
  transition: background var(--transition), color var(--transition);
}
.feature-card:hover .feature-icon {
  background: var(--accent);
  color: #fff;
}

.feature-card h3 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 5px;
}

.feature-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --- Landing CTA (below features) --- */
#landing-cta {
  max-width: 1100px;
  margin: 0 auto;
  padding: 36px 20px 56px;
}

.landing-cta-inner {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 700;
  padding: 10px 24px;
  border-radius: 100px;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}

.cta-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 3px 10px rgba(13,124,102,0.25);
}
.cta-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 5px 16px rgba(13,124,102,0.3);
}

.cta-secondary {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.cta-secondary:hover {
  background: var(--accent-light);
  transform: translateY(-1px);
}

/* --- Workspace Top Bar --- */
.ws-top-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.btn-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 100px;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-back:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

.ws-title {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.4px;
}

/* --- Instructions --- */
.instructions-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-bottom: 20px;
}

.instructions-text {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}
.instructions-text strong { color: var(--text); }

/* --- Upload Area --- */
.upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 20px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--bg-alt);
  margin-bottom: 10px;
}
.upload-area:hover,
.upload-area.drag-over {
  border-color: var(--accent);
  background: var(--accent-light);
}
.upload-area:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.upload-area.drag-over .upload-icon { transform: scale(1.1); }

.upload-icon-wrap { margin-bottom: 10px; }

.upload-icon {
  font-size: 30px;
  color: var(--accent);
  transition: transform var(--transition);
}

.upload-primary {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.upload-secondary {
  font-size: 12px;
  color: var(--text-muted);
}

/* --- Text Buttons --- */
.btn-text {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}
.btn-text:hover {
  color: var(--accent);
  background: var(--accent-light);
}

.reset-wrap {
  text-align: center;
  margin-bottom: 20px;
}

/* --- Data Info --- */
.data-info {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.info-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  background: var(--accent-light);
  color: var(--accent-dark);
  border-radius: 100px;
  font-weight: 600;
  font-size: 13px;
}
.info-badge i { font-size: 12px; color: var(--accent); }

/* --- Data Table --- */
.table-section { margin-bottom: 24px; }

.table-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  gap: 12px;
  flex-wrap: wrap;
}

.table-heading {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.2px;
}
.table-sublabel {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
}

.data-table-wrapper {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
  box-shadow: var(--shadow-xs);
  max-height: 260px;
  overflow-y: auto;
}

.data-table-wrapper.expanded {
  max-height: none;
  overflow-x: auto;
  overflow-y: visible;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12.5px;
  min-width: 500px;
}

.data-table th {
  background: var(--accent);
  color: #fff;
  padding: 7px 12px;
  text-align: left;
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  white-space: nowrap;
  position: sticky;
  top: 0;
  z-index: 2;
}

.data-table td {
  padding: 6px 12px;
  border-bottom: 1px solid var(--border-light);
  white-space: nowrap;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:nth-child(even) { background: var(--bg-alt); }
.data-table tbody tr:hover { background: var(--accent-light); }

.data-table .ellipsis-cell {
  text-align: center;
  color: var(--text-muted);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 3px;
  background: var(--border-light) !important;
  padding: 6px 14px;
}

.data-table th.ellipsis-cell {
  background: var(--accent-dark);
  text-align: center;
  letter-spacing: 3px;
}

/* --- Chart Config --- */
.config-section { margin-bottom: 20px; }

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

.config-heading {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.2px;
}

.config-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px;
}

.config-item label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 5px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.config-item select {
  width: 100%;
  padding: 8px 32px 8px 10px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  background: var(--surface);
  cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition);
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%239CA3AF' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
}
.config-item select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(13,124,102,0.1);
}

/* --- Chart Display --- */
.chart-section { margin-bottom: 32px; }

.chart-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow);
  margin-bottom: 14px;
}

#mainChart {
  width: 100% !important;
  max-height: 440px;
}

.download-buttons {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  border: 1.5px solid var(--accent);
  background: transparent;
  color: var(--accent);
  border-radius: 100px;
  font-family: var(--font);
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-download:hover {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 3px 10px rgba(13,124,102,0.2);
}
.btn-download:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* --- Footer --- */
#site-footer {
  text-align: center;
  padding: 18px 20px;
  border-top: 1px solid var(--border-light);
}

#site-footer p {
  font-size: 13px;
  color: var(--text-muted);
}

#site-footer a {
  font-weight: 700;
  color: var(--accent);
}
#site-footer a:hover { text-decoration: underline; }

/* --- Page Transitions --- */
#landing-page,
#workspace-page {
  transition: opacity 0.3s ease;
}

#landing-page.fade-out {
  opacity: 0;
  pointer-events: none;
}

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .features-grid {
    grid-template-columns: 1fr;
  }

  .config-grid {
    grid-template-columns: 1fr;
    padding: 14px;
  }

  #hero {
    padding: 40px 16px 32px;
  }

  #features-section {
    padding: 0 16px 0;
  }

  #landing-cta {
    padding: 28px 16px 40px;
  }

  #workspace {
    padding: 16px 16px 40px;
  }

  .chart-card { padding: 14px; }

  .download-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn-download {
    width: 100%;
    max-width: 220px;
    justify-content: center;
  }

  .data-info { justify-content: center; }

  .ws-top-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .landing-cta-inner {
    flex-direction: column;
  }

  .cta-btn {
    width: 100%;
    max-width: 240px;
    justify-content: center;
  }
}

@media (max-width: 400px) {
  .hero-title { font-size: 1.6rem; }
  .hero-subtitle { font-size: 14px; }
  .upload-area { padding: 24px 14px; }
  .upload-icon { font-size: 26px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}