/* =========================================
   DESIGN TOKENS
========================================= */
:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --ink: #0f172a;
  --ink-muted: #475569;
  --ink-soft: #64748b;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --accent: #0f172a;
  --accent-hover: #1e293b;
  --highlight: #f59e0b;
  --highlight-soft: #fef3c7;
  --danger: #dc2626;
  --danger-soft: #fee2e2;
  --success: #16a34a;
  --success-soft: #dcfce7;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-lg:
    0 1px 2px rgba(15, 23, 42, 0.04), 0 8px 24px rgba(15, 23, 42, 0.06);
  --maxw: 760px;
}

/* =========================================
   RESET / BASE
========================================= */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
}

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

a:hover {
  color: var(--accent-hover);
}

/* =========================================
   LAYOUT CONTAINERS
========================================= */
.site-header {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 28px 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--accent);
  color: white;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-name {
  font-size: 17px;
  color: var(--ink);
}

.site-nav {
  display: flex;
  gap: 22px;
  font-size: 14px;
}

.site-nav a {
  color: var(--ink-muted);
  font-weight: 500;
}

.site-nav a:hover {
  color: var(--ink);
}

/* =========================================
   HERO
========================================= */
.hero {
  max-width: var(--maxw);
  margin: 56px auto 36px;
  padding: 0 24px;
  text-align: left;
}

.eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--highlight);
  background: var(--highlight-soft);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 18px;
}

.hero h1 {
  font-size: clamp(28px, 4.2vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
  font-weight: 700;
  color: var(--ink);
}

.subhead {
  font-size: 17px;
  color: var(--ink-muted);
  max-width: 620px;
  margin: 0 0 22px;
}

.hero-bullets {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
  font-size: 14.5px;
  color: var(--ink-muted);
}

.hero-bullets li {
  position: relative;
  padding-left: 22px;
}

.hero-bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--highlight);
}

/* =========================================
   TOOL SHELL + CARD
========================================= */
.tool-shell {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.card {
  background: var(--surface);
  padding: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}

.form-group {
  margin-bottom: 20px;
}

label {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.005em;
  margin-bottom: 8px;
  color: var(--ink);
}

.label-hint {
  font-weight: 400;
  color: var(--ink-soft);
  font-size: 13px;
}

input[type="file"],
input[type="text"],
textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 14.5px;
  color: var(--ink);
  background: var(--surface);
  transition:
    border-color 0.15s ease,
    box-shadow 0.15s ease;
}

input[type="text"]::placeholder,
textarea::placeholder {
  color: var(--ink-soft);
}

input[type="text"]:focus,
textarea:focus,
input[type="file"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 23, 42, 0.08);
}

input[type="file"] {
  padding: 10px 14px;
  font-size: 14px;
  color: var(--ink-muted);
}

textarea#extractFields {
  resize: none;
  overflow: hidden;
  min-height: 56px;
  line-height: 1.5;
}

button {
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 13px 20px;
  transition:
    background 0.15s ease,
    transform 0.05s ease;
}

.btn-primary,
button[type="submit"] {
  background: var(--accent);
  color: white;
  width: 100%;
  margin-top: 4px;
}

.btn-primary:hover,
button[type="submit"]:hover {
  background: var(--accent-hover);
}

.btn-primary:active,
button[type="submit"]:active {
  transform: translateY(1px);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  background: var(--ink-soft);
}

button:disabled:hover {
  background: var(--ink-soft);
}

.lock-note {
  margin: 12px 0 0;
  font-size: 12.5px;
  color: var(--ink-soft);
  text-align: center;
  line-height: 1.5;
}

.lock-note a {
  color: var(--ink);
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.lock-note a:hover {
  color: var(--accent-hover);
}

/* Status + results */
#status-message {
  margin-top: 18px;
  text-align: center;
  font-size: 14px;
  font-weight: 500;
  min-height: 20px;
}

#results {
  margin-top: 22px;
  padding: 20px;
  background: var(--success-soft);
  border: 1px solid #bbf7d0;
  border-radius: var(--radius-sm);
  display: none;
}

#results h3 {
  margin: 0 0 6px;
  font-size: 16px;
  color: #166534;
}

#results p {
  margin: 0 0 14px;
  color: #166534;
  font-size: 14px;
}

#downloadBtn {
  background: var(--success);
  color: white;
  padding: 10px 18px;
  font-size: 14px;
}

#downloadBtn:hover {
  background: #15803d;
}

/* =========================================
   GUIDE (collapsible)
========================================= */
.guide {
  margin: 20px 0 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.guide > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  user-select: none;
  transition: background 0.15s ease;
}

.guide > summary::-webkit-details-marker {
  display: none;
}

.guide > summary:hover {
  background: #f8fafc;
}

.guide-icon {
  font-size: 18px;
}

.guide-label {
  flex: 1;
}

.guide-chevron {
  font-size: 14px;
  color: var(--ink-soft);
  transition: transform 0.2s ease;
}

.guide[open] .guide-chevron {
  transform: rotate(180deg);
}

.guide-body {
  padding: 4px 24px 24px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--ink-muted);
}

.guide-body h4 {
  margin: 20px 0 8px;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.guide-body ul {
  padding-left: 18px;
  margin: 0 0 8px;
}

.guide-body li {
  margin-bottom: 8px;
  line-height: 1.55;
}

.guide-body strong {
  color: var(--ink);
  font-weight: 600;
}

.guide-body code {
  background: #f1f5f9;
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 4px;
  font-family:
    ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 12.5px;
  color: var(--ink);
}

.danger-text {
  color: var(--danger);
}

/* =========================================
   FOOTER
========================================= */
.site-footer {
  max-width: var(--maxw);
  margin: 60px auto 30px;
  padding: 24px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
  color: var(--ink-soft);
  border-top: 1px solid var(--border);
}

/* =========================================
   RESPONSIVE
========================================= */
@media (max-width: 720px) {
  .site-header {
    padding-top: 20px;
  }

  .hero {
    margin: 36px auto 28px;
  }

  .card {
    padding: 28px 22px;
  }

  .guide > summary {
    padding: 16px 20px;
  }

  .guide-body {
    padding: 4px 20px 20px;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}