/* Open Hair Stack — Precision Clinical Styling & Portfolio-Grade UI */
:root {
  --bg: #070a13;
  --card: #0d1526;
  --card-inner: #111b33;
  --card-hover: #14213d;
  --border: #1e2e4a;
  --border-light: #2c4266;
  --text: #f8fafc;
  --dim: #94a3b8;
  --dimmer: #64748b;
  --accent: #00e5ff;
  --accent-glow: rgba(0, 229, 255, 0.25);
  --accent-dark: #0284c7;
  --good: #10b981;
  --good-bg: rgba(16, 185, 129, 0.12);
  --warn: #f59e0b;
  --warn-bg: rgba(245, 158, 11, 0.12);
  --danger: #ef4444;
  --radius: 12px;
  --radius-sm: 8px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Institutional Branding */
header {
  padding: 38px 0 16px;
  border-bottom: 1px solid rgba(30, 46, 74, 0.6);
  background: radial-gradient(circle at 50% 0%, rgba(0, 229, 255, 0.05) 0%, transparent 70%);
}

.brand-line {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 12px;
}

.brand-logo {
  border-radius: 10px;
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(0, 229, 255, 0.18);
  border: 1px solid rgba(0, 229, 255, 0.3);
}

.brand-title-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

h1 {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: #fff;
}

.thin {
  font-weight: 300;
  color: var(--dim);
}

.tag-version {
  font-size: 11px;
  font-weight: 600;
  font-family: var(--mono);
  background: rgba(0, 229, 255, 0.12);
  color: var(--accent);
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid rgba(0, 229, 255, 0.3);
  letter-spacing: 0.5px;
}

.tagline {
  color: var(--dim);
  font-size: 14.5px;
  margin-top: 3px;
}

.badges {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.badge {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px 13px;
  font-size: 12.5px;
  color: var(--dim);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  transition: border-color 0.15s, color 0.15s;
}

.badge:hover {
  border-color: var(--accent);
  color: var(--text);
}

.badge.warn {
  border-color: rgba(245, 158, 11, 0.4);
  color: #fbbf24;
  background: var(--warn-bg);
}

.badge.privacy-badge {
  border-color: rgba(16, 185, 129, 0.4);
  color: #34d399;
  background: var(--good-bg);
}

/* Beacon Indicators */
.beacon {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.beacon-green {
  background: var(--good);
  box-shadow: 0 0 8px var(--good);
}

.beacon-pulse {
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  animation: beacon-glow 1.8s infinite ease-in-out;
}

@keyframes beacon-glow {
  0%, 100% { opacity: 0.5; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1.2); }
}

/* Telemetry Status Card */
.status-card {
  margin: 22px 0 16px;
  padding: 12px 18px;
  border-radius: 10px;
  background: var(--card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13.5px;
}

.status-left {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 500;
}

.status-specs {
  color: var(--dimmer);
  font-size: 12.5px;
  font-family: var(--mono);
}

/* Card Foundations */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin: 18px 0;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
  border-bottom: 1px solid rgba(30, 46, 74, 0.5);
  padding-bottom: 12px;
}

.card-title-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.step-badge {
  background: var(--card-inner);
  border: 1px solid var(--border);
  color: var(--accent);
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  font-family: var(--mono);
}

.step-badge.good {
  color: var(--good);
  border-color: rgba(16, 185, 129, 0.4);
}

.card h2 {
  font-size: 18px;
  font-weight: 600;
  color: #fff;
}

.card-subtitle {
  font-size: 13.5px;
  color: var(--dim);
}

/* Drop Zone (Empty State) */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 10px;
  text-align: center;
  padding: 34px 20px;
  background: rgba(13, 21, 38, 0.4);
  transition: all 0.2s ease;
  cursor: pointer;
}

.drop-zone:hover, .drop-zone.over {
  border-color: var(--accent);
  background: rgba(0, 229, 255, 0.04);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.08) inset;
}

.drop-icon-wrap {
  width: 48px;
  height: 48px;
  margin: 0 auto 12px;
  background: var(--card-inner);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}

.drop-icon {
  width: 24px;
  height: 24px;
}

.drop-title {
  font-size: 16px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 6px;
}

.btn-text {
  background: none;
  border: none;
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
  cursor: pointer;
  font: inherit;
}

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

.drop-hint {
  font-size: 13px;
  color: var(--dimmer);
  max-width: 600px;
  margin: 0 auto 18px;
}

.sample-picker {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  padding-top: 14px;
  border-top: 1px solid rgba(30, 46, 74, 0.6);
}

.sample-label {
  font-size: 13px;
  color: var(--dim);
}

.sample-btn {
  background: var(--card-inner);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 12.5px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.15s ease;
}

.sample-btn:hover {
  border-color: var(--accent);
  background: var(--card-hover);
  color: #fff;
}

.sample-swatch {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

/* Uploaded Photo Preview Card (Active State) */
.preview-card {
  display: flex;
  gap: 22px;
  align-items: center;
  background: var(--card-inner);
  border: 1px solid var(--border-light);
  border-radius: 10px;
  padding: 18px 22px;
  transition: all 0.25s ease;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.preview-thumb-wrap {
  width: 130px;
  height: 130px;
  min-width: 130px;
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  border: 2px solid var(--border);
  background: #000;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.preview-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.thumb-reticle {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: 
    linear-gradient(to right, var(--accent) 2px, transparent 2px) 0 0,
    linear-gradient(to bottom, var(--accent) 2px, transparent 2px) 0 0,
    linear-gradient(to left, var(--accent) 2px, transparent 2px) 100% 0,
    linear-gradient(to bottom, var(--accent) 2px, transparent 2px) 100% 0,
    linear-gradient(to right, var(--accent) 2px, transparent 2px) 0 100%,
    linear-gradient(to top, var(--accent) 2px, transparent 2px) 0 100%,
    linear-gradient(to left, var(--accent) 2px, transparent 2px) 100% 100%,
    linear-gradient(to top, var(--accent) 2px, transparent 2px) 100% 100%;
  background-repeat: no-repeat;
  background-size: 10px 10px;
  opacity: 0.6;
}

.preview-info {
  flex: 1;
}

.preview-meta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}

.preview-tag-ready {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: #34d399;
  font-weight: 600;
  background: var(--good-bg);
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.preview-dim {
  font-size: 12px;
  font-family: var(--mono);
  color: var(--dim);
}

.preview-filename {
  font-size: 17px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 4px;
}

.preview-desc {
  font-size: 13.5px;
  color: var(--dim);
  margin-bottom: 14px;
}

.preview-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* Button Component Hierarchy */
.btn {
  background: var(--card-inner);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.15s ease;
  font-family: inherit;
}

.btn:hover {
  background: var(--card-hover);
  border-color: var(--border-light);
}

.btn.primary {
  background: linear-gradient(135deg, #00e5ff 0%, #0284c7 100%);
  color: #050b14;
  font-weight: 700;
  border: none;
  box-shadow: 0 4px 16px rgba(0, 229, 255, 0.25);
}

.btn.primary:hover {
  box-shadow: 0 6px 20px rgba(0, 229, 255, 0.4);
  transform: translateY(-1px);
}

.btn.primary:disabled {
  background: #1b263b;
  color: #556987;
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

.btn.secondary {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
}

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

.btn.btn-ghost {
  background: none;
  border: 1px solid transparent;
  color: var(--dim);
}

.btn.btn-ghost:hover {
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.3);
  background: rgba(239, 68, 68, 0.08);
}

.btn-large {
  padding: 12px 28px;
  font-size: 15.5px;
  width: 100%;
}

.btn-small {
  padding: 5px 12px;
  font-size: 12.5px;
}

/* Section 2 Controls Grid */
.controls-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.control-box {
  background: var(--card-inner);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
}

.control-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.control-header label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.val-badge {
  font-size: 13px;
  font-weight: 700;
  font-family: var(--mono);
  background: rgba(0, 229, 255, 0.1);
  color: var(--accent);
  padding: 2px 8px;
  border-radius: 6px;
  border: 1px solid rgba(0, 229, 255, 0.25);
}

input[type=range] {
  width: 100%;
  accent-color: var(--accent);
  margin: 6px 0;
  cursor: pointer;
}

.range-ticks {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  font-family: var(--mono);
  color: var(--dimmer);
  margin-bottom: 8px;
}

.control-help {
  font-size: 12.5px;
  color: var(--dim);
  margin-top: 8px;
  line-height: 1.4;
}

.input-with-unit {
  position: relative;
  display: flex;
  align-items: center;
}

.input-with-unit input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 9px 12px;
  color: #fff;
  font-size: 14px;
  font-family: var(--mono);
}

.input-with-unit input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(0, 229, 255, 0.15);
}

.input-unit {
  position: absolute;
  right: 12px;
  font-size: 12.5px;
  color: var(--dimmer);
  pointer-events: none;
}

.quick-presets {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.preset-label {
  font-size: 12px;
  color: var(--dimmer);
}

.preset-btn {
  background: rgba(30, 46, 74, 0.5);
  border: 1px solid var(--border);
  color: var(--dim);
  font-size: 11.5px;
  padding: 3px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
}

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

.action-bar {
  margin-top: 6px;
}

/* Spinner */
.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(5, 11, 20, 0.3);
  border-top-color: #050b14;
  border-radius: 50%;
  display: inline-block;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* SECTION 3: Results KPI Stat Cards */
.results-actions {
  display: flex;
  gap: 8px;
}

.stat-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 22px;
}

.stat-card {
  background: var(--card-inner);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.stat-label {
  font-size: 12.5px;
  color: var(--dim);
  font-weight: 500;
}

.stat-number-wrap {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 6px 0;
}

.stat-number {
  font-size: 28px;
  font-weight: 700;
  color: #fff;
  font-family: var(--mono);
  letter-spacing: -0.5px;
}

.stat-unit {
  font-size: 13px;
  color: var(--dim);
  font-weight: 500;
}

.stat-sub {
  font-size: 12px;
  color: var(--dimmer);
  line-height: 1.35;
}

.norwood-badge {
  font-size: 13.5px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(0, 229, 255, 0.1);
  color: var(--accent);
  border: 1px solid rgba(0, 229, 255, 0.25);
}

/* Results Content Grid */
.results-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 24px;
}

.canvas-panel {
  background: var(--card-inner);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}

.canvas-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}

.canvas-title {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text);
}

.filter-chips {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.chip {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--dim);
  border-radius: 6px;
  padding: 3px 8px;
  font-size: 12px;
  font-family: var(--mono);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all 0.15s;
}

.chip i {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  display: inline-block;
}

.chip:hover {
  border-color: var(--border-light);
  color: var(--text);
}

.chip.active {
  background: rgba(0, 229, 255, 0.12);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

.canvas-container {
  border-radius: 8px;
  overflow: hidden;
  background: #000;
  border: 1px solid var(--border);
}

canvas#out {
  width: 100%;
  height: auto;
  display: block;
}

.canvas-hint {
  font-size: 12px;
  color: var(--dimmer);
  margin-top: 10px;
}

/* Metrics & Sandbox Panel */
.metrics-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.panel-section {
  background: var(--card-inner);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}

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

.panel-section h3 {
  font-size: 14.5px;
  font-weight: 600;
  color: #fff;
}

.tiny-badge {
  font-size: 11px;
  color: var(--dim);
  background: var(--card);
  padding: 2px 7px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

/* Zone Progress Bars */
.zone-bar-item {
  margin-bottom: 12px;
}

.zone-bar-header {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  margin-bottom: 4px;
}

.zone-bar-name {
  color: var(--text);
  font-weight: 500;
}

.zone-bar-count {
  font-family: var(--mono);
  color: var(--accent);
}

.zone-bar-track {
  height: 8px;
  background: rgba(30, 46, 74, 0.5);
  border-radius: 999px;
  overflow: hidden;
  position: relative;
}

.zone-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #0284c7, #00e5ff);
  border-radius: 999px;
  transition: width 0.3s ease;
}

.zone-bar-sub {
  font-size: 11.5px;
  color: var(--dimmer);
  margin-top: 3px;
}

/* Plan Table */
.plan {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin: 10px 0 14px;
}

.plan th, .plan td {
  border-bottom: 1px solid var(--border);
  padding: 7px 8px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.plan th {
  color: var(--dim);
  font-weight: 600;
  font-size: 12px;
}

.plan th:first-child, .plan td:first-child {
  text-align: left;
  color: var(--text);
  font-weight: 500;
}

.chart-container {
  border-radius: 6px;
  overflow: hidden;
  background: #000;
  border: 1px solid var(--border);
  margin-top: 10px;
}

canvas#chart {
  width: 100%;
  height: auto;
  display: block;
}

.assumptions {
  font-size: 12px;
  color: var(--dimmer);
  white-space: pre-line;
  margin-top: 10px;
  line-height: 1.45;
}

/* Ethical Disclaimer */
.disclaimer h2 {
  font-size: 16px;
  margin-bottom: 12px;
}

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

.disclaimer-col p {
  font-size: 13px;
  color: var(--dim);
  margin-bottom: 10px;
  line-height: 1.5;
}

.disclaimer-col b {
  color: var(--text);
}

.disclaimer a {
  color: var(--accent);
  text-decoration: underline;
}

/* Footer */
footer {
  padding: 30px 0 50px;
  border-top: 1px solid rgba(30, 46, 74, 0.6);
  margin-top: 30px;
  font-size: 13.5px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  color: var(--dim);
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-right {
  display: flex;
  gap: 18px;
}

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

footer a:hover {
  text-decoration: underline;
}

.hidden {
  display: none !important;
}

/* Responsive Breakpoints */
@media (max-width: 960px) {
  .stat-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .results-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .controls-grid {
    grid-template-columns: 1fr;
  }
  .disclaimer-grid {
    grid-template-columns: 1fr;
  }
  .preview-card {
    flex-direction: column;
    text-align: center;
  }
  .preview-thumb-wrap {
    margin: 0 auto;
  }
  .preview-meta-row {
    justify-content: center;
  }
  .preview-actions {
    justify-content: center;
  }
  .stat-cards-grid {
    grid-template-columns: 1fr;
  }
}