@import url("https://fonts.googleapis.com/css2?family=Source+Sans+3:wght@400;500;600;700&family=Source+Code+Pro:wght@400;500;600&display=swap");

:root {
  --bg: #ffffff;
  --sidebar-bg: #f0f2f6;
  --surface-2: #f7f8fa;
  --surface-3: #eef0f4;
  --border: #d6d8de;
  --border-soft: #e6e7eb;
  --ink-1: #262730;
  --ink-2: #4a4c56;
  --ink-3: #808495;
  --ink-4: #a3a8b4;

  --primary: #ff4b4b;
  --primary-ink: #d93b3b;
  --primary-soft: #ffecec;

  --info: #4880ee;
  --info-soft: #e7eefd;
  --info-ink: #2c4d99;
  --warn: #b8860b;
  --warn-ink: #8a6508;
  --warn-soft: #fff5d6;
  --warn-border: #ffd75e;
  --good: #1fa463;
  --good-ink: #0c633c;
  --good-soft: #e3f5ec;
  --bad: #e23b3b;

  --sans: "Source Sans 3", "Source Sans Pro", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono: "Source Code Pro", ui-monospace, SFMono-Regular, Menlo, monospace;

  --radius: 8px;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  color: var(--ink-1);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
button, input, select { font-family: inherit; color: inherit; }
button { cursor: pointer; }
h1, h2, h3, p, ul { margin: 0; padding: 0; }
ul { list-style: none; }

/* ---------------- APP SHELL ---------------- */
body {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: 100vh;
}

/* ---------------- SIDEBAR ---------------- */
.sidebar {
  background: var(--sidebar-bg);
  padding: 28px 22px 40px 22px;
  border-right: 1px solid var(--border-soft);
  overflow-y: auto;
}
.sb-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-1);
  margin: 18px 0 8px 0;
}
.sb-label:first-child { margin-top: 0; }
.nav-list { display: flex; flex-direction: column; gap: 2px; }
.nav-item {
  display: flex; align-items: center;
  width: 100%;
  padding: 6px 8px;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  color: var(--ink-2);
  background: transparent;
  font-size: 15px;
  line-height: 1.3;
  text-align: left;
  user-select: none;
}
.nav-item:hover { background: #e6e8ee; color: var(--ink-1); }
.nav-item.active {
  color: var(--ink-1);
  font-weight: 500;
  background: #e6e8ee;
}
.sb-divider {
  height: 1px;
  background: var(--border-soft);
  margin: 20px 0;
}

/* ---------------- MAIN ---------------- */
.main {
  padding: 56px 72px 80px 72px;
  max-width: 1100px;
  min-width: 0;
  overflow-x: hidden;
}

.panel { display: none; }
.panel.active { display: block; }

h1.page-title {
  font-size: 34px;
  font-weight: 700;
  margin: 0 0 8px 0;
  letter-spacing: -0.015em;
  line-height: 1.15;
}
.page-caption {
  font-size: 15px;
  color: var(--ink-3);
  margin: 0 0 28px 0;
}
hr.divider {
  border: 0;
  border-top: 1px solid var(--border-soft);
  margin: 28px 0;
}
h3.subsec {
  font-size: 17px;
  font-weight: 600;
  margin: 32px 0 14px 0;
  color: var(--ink-1);
}
h3.subsec:first-child { margin-top: 0; }

/* ---------------- INPUT WIDGETS ---------------- */
.widgets {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px 16px;
}
@media (max-width: 1100px) { .widgets { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 820px)  { .widgets { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 520px)  { .widgets { grid-template-columns: 1fr; } }

.widget {
  display: flex; flex-direction: column;
  gap: 4px;
  min-width: 0;
}
.widget label {
  font-size: 14px;
  font-weight: 400;
  color: var(--ink-1);
}
.widget .help-dot {
  display: inline-block;
  width: 14px; height: 14px;
  border-radius: 50%;
  border: 1px solid var(--ink-4);
  color: var(--ink-3);
  text-align: center;
  font-size: 10px;
  line-height: 12px;
  margin-left: 4px;
  cursor: help;
}

.input,
.select {
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-2);
  padding: 0 14px;
  font-size: 15px;
  color: var(--ink-1);
  display: flex; align-items: center;
  transition: border-color 120ms, box-shadow 120ms;
  position: relative;
}
.input:hover, .select:hover { border-color: var(--ink-4); }
.input:focus-within, .select:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-soft);
}
.input input,
.select select {
  flex: 1;
  border: 0;
  background: transparent;
  font-size: 15px;
  color: var(--ink-1);
  width: 100%;
  min-width: 0;
  outline: none;
  padding: 0;
  font-variant-numeric: tabular-nums;
}
.input input::-webkit-outer-spin-button,
.input input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.input input[type="number"] { -moz-appearance: textfield; }

.select { padding: 0; cursor: pointer; }
.select select {
  appearance: none;
  cursor: pointer;
  position: absolute;
  inset: 0;
  height: 100%;
  padding: 0 36px 0 14px;
}
.select::after {
  content: "";
  position: absolute;
  right: 14px; top: 50%;
  width: 8px; height: 8px;
  border-right: 1.5px solid var(--ink-3);
  border-bottom: 1.5px solid var(--ink-3);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}

.input:has(input:disabled),
.select:has(select:disabled) {
  background: var(--surface-3);
  cursor: not-allowed;
}
.input input:disabled,
.select select:disabled {
  color: var(--ink-4);
  cursor: not-allowed;
}

/* ---------------- BUTTONS ---------------- */
.btn-row,
.actions {
  display: flex; align-items: center; gap: 12px;
  margin-top: 22px;
  flex-wrap: wrap;
}
.btn,
.primary,
.ghost {
  height: 38px;
  padding: 0 18px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--ink-1);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex; align-items: center; gap: 8px;
  line-height: 1;
  white-space: nowrap;
  transition: all 120ms;
}
.btn:hover,
.ghost:hover { border-color: var(--ink-3); }
.btn.primary,
.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.btn.primary:hover,
.primary:hover { background: var(--primary-ink); border-color: var(--primary-ink); }
.btn.ghost,
.ghost {
  border-color: transparent;
  background: transparent;
}
.btn.ghost:hover,
.ghost:hover { background: var(--surface-2); border-color: var(--border); }

/* ---------------- OUTPUT (rendered by app.js) ---------------- */
.output:not(:empty) {
  display: block;
  margin-top: 28px;
}
.output:not(:empty)::before {
  content: "";
  display: block;
  border-top: 1px solid var(--border-soft);
  margin-bottom: 28px;
}

/* ---------------- METRICS (.result-grid + .metric) ---------------- */
.result-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}
@media (max-width: 1100px) { .result-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 820px)  { .result-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 520px)  { .result-grid { grid-template-columns: 1fr; } }

.metric {
  background: var(--surface-2);
  border-radius: 8px;
  padding: 16px 18px;
  display: flex; flex-direction: column;
  min-height: 92px;
}
.metric span {
  font-size: 14px;
  color: var(--ink-2);
  margin-bottom: 4px;
  display: block;
}
.metric strong {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--ink-1);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  display: block;
  overflow-wrap: anywhere;
}

/* ---------------- CALLOUT (.warning) ---------------- */
.warning {
  display: flex; gap: 12px;
  padding: 14px 16px;
  border-radius: 8px;
  background: var(--warn-soft);
  color: var(--warn-ink);
  font-size: 14.5px;
  line-height: 1.55;
  margin: 18px 0;
}
.warning::before {
  content: "!";
  flex-shrink: 0;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--warn);
  color: #fff;
  font-weight: 700;
  font-size: 13px;
  display: grid; place-items: center;
  margin-top: 1px;
}

/* ---------------- SKU CARDS (.parts + .part) ---------------- */
.parts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 18px;
}
@media (max-width: 900px) { .parts { grid-template-columns: 1fr; } }

.part {
  border: 1px solid var(--border-soft);
  border-radius: 8px;
  background: #fff;
  padding: 18px 20px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  column-gap: 16px;
  align-items: start;
}
.part > div:first-child { min-width: 0; }
.recommendation-line {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 4px;
  font-size: 13px;
  color: var(--ink-3);
}
.status-pill {
  font-size: 13px;
  color: var(--ink-3);
  font-weight: 500;
  text-transform: none;
}
.fit-reason {
  font-size: 13px;
  color: var(--warn-ink);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.part h3 {
  font-family: var(--mono);
  font-size: 19px;
  font-weight: 600;
  color: var(--ink-1);
  margin: 2px 0 2px 0;
  line-height: 1.25;
  overflow-wrap: anywhere;
}
.part p {
  font-size: 14px;
  color: var(--ink-2);
  margin: 0 0 12px 0;
  line-height: 1.45;
}
.part ul {
  display: flex; flex-wrap: wrap; gap: 6px;
  padding-top: 12px;
  margin-top: 4px;
  border-top: 1px solid var(--border-soft);
}
.part li {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-2);
  background: var(--surface-2);
  border-radius: 4px;
  padding: 2px 8px;
  line-height: 1.4;
}
.part-actions {
  display: flex; flex-direction: column; align-items: flex-end; gap: 8px;
  min-width: 0;
}
.badge {
  display: inline-flex; align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
  font-family: var(--mono);
  background: var(--good-soft);
  color: var(--good-ink);
  white-space: nowrap;
}
.product-link {
  font-size: 14px;
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
  white-space: nowrap;
}
.product-link:hover { text-decoration: underline; }

/* ---------------- EMPTY STATE ---------------- */
.empty {
  padding: 18px 20px;
  border-radius: 8px;
  background: var(--info-soft);
  color: var(--info-ink);
  font-size: 14.5px;
  line-height: 1.55;
  margin-top: 18px;
}


/* ---------------- ABSOLUTELY UNNECESSARY BUTTON ---------------- */
.danger-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 76px;
  padding: 42px 0 6px;
  border-top: 1px solid var(--border-soft);
}

.panic-button {
  min-height: 46px;
  padding: 0 24px;
  border: 1px solid #1f1f24;
  border-radius: 999px;
  background: #1f1f24;
  color: #ffffff;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  box-shadow: 0 12px 30px rgba(31, 31, 36, 0.16);
  transition: transform 140ms ease, box-shadow 140ms ease, background 140ms ease;
}

.panic-button:hover:not(:disabled) {
  transform: translateY(-2px);
  background: var(--primary);
  border-color: var(--primary);
  box-shadow: 0 16px 38px rgba(255, 75, 75, 0.24);
}

.panic-button:disabled {
  cursor: not-allowed;
  background: var(--primary);
  border-color: var(--primary);
}

.panic-reveal {
  max-width: min(680px, 100%);
  margin: 0;
  color: var(--ink-1);
  font-size: clamp(22px, 3vw, 36px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
  text-align: center;
  opacity: 0;
  transform: translateY(12px) scale(0.98);
  pointer-events: none;
  transition: opacity 360ms ease, transform 360ms ease;
}

.panic-reveal.show {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.text-fall-active .falling-copy {
  display: inline-block;
  position: relative;
  z-index: 4;
  animation: textFall var(--fall-duration, 2.8s) cubic-bezier(.2, .7, .16, 1) var(--fall-delay, 0s) forwards;
  transform-origin: 50% 100%;
  will-change: transform, opacity;
}

@keyframes textFall {
  0% {
    opacity: 1;
    transform: translate3d(0, 0, 0) rotate(0deg);
  }
  18% {
    opacity: 1;
    transform: translate3d(0, -8px, 0) rotate(calc(var(--fall-rotate, 8deg) * -0.35));
  }
  100% {
    opacity: 0.08;
    transform: translate3d(var(--fall-drift, 0px), var(--fall-distance, 120vh), 0) rotate(var(--fall-rotate, 8deg));
  }
}

@media (prefers-reduced-motion: reduce) {
  .text-fall-active .falling-copy {
    animation: textWobble 700ms ease-in-out var(--fall-delay, 0s) both;
  }
}

@keyframes textWobble {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

/* ---------------- MOBILE ---------------- */
@media (max-width: 760px) {
  body {
    grid-template-columns: 1fr;
  }
  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--border-soft);
    padding: 20px 22px 24px;
  }
  .main {
    padding: 28px 22px 60px;
  }
  h1.page-title { font-size: 28px; }
}