/* ==========================================================================
   UnseenTexts — Design system
   Palette: warm paper background, ink text, deep pine accent,
   amber "highlighter" used sparingly as the signature mark.
   Typeface pairing: a text-critic serif for display, a clean grotesque
   for body/UI, a mono face for counters — echoing the "annotate a passage"
   idea the whole product is built around.
   ========================================================================== */

:root {
  --paper: #faf8f3;
  --paper-raised: #ffffff;
  --ink: #22281f;
  --ink-soft: #3a4136;
  --muted: #6b7268;
  --pine: #2f5d50;
  --pine-dark: #234840;
  --pine-tint: #e7efec;
  --highlight: #f5c84c;
  --highlight-soft: #fbe9b8;
  --line: #ddd6c6;
  --line-soft: #ece7d9;
  --danger: #b3452e;
  --danger-tint: #f7e7e2;

  --font-display: 'Source Serif 4', 'Iowan Old Style', Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(34, 40, 31, 0.06);
  --shadow-md: 0 6px 20px rgba(34, 40, 31, 0.08);
  --container: 1120px;
}

/* ---------- Reset & base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

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

a:hover {
  text-decoration: underline;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 0.5em;
  color: var(--ink);
}

h1 {
  font-size: clamp(2rem, 4vw, 3.1rem);
  letter-spacing: -0.01em;
}

h2 {
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
}

h3 {
  font-size: 1.25rem;
}

p {
  margin: 0 0 1em;
}

.muted {
  color: var(--muted);
}

ul,
ol {
  padding-left: 1.25em;
}

/* Visible keyboard focus for accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid var(--highlight);
  outline-offset: 2px;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: #fff;
  padding: 10px 16px;
  z-index: 200;
  border-radius: 0 0 var(--radius-sm) 0;
}

.skip-link:focus {
  left: 0;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 22px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.12s ease, background-color 0.15s ease, border-color 0.15s ease;
  text-decoration: none;
  line-height: 1.1;
}

.btn:hover {
  text-decoration: none;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--pine);
  color: #fff;
}

.btn-primary:hover {
  background: var(--pine-dark);
}

.btn-secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

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

.btn-ghost {
  background: transparent;
  color: var(--pine);
  padding: 8px 14px;
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 8px 14px;
  font-size: 0.85rem;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 248, 243, 0.92);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--line-soft);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
}

.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--ink);
  display: flex;
  align-items: baseline;
  gap: 2px;
}

.logo:hover {
  text-decoration: none;
}

.logo .mark {
  color: var(--pine);
  background: linear-gradient(transparent 60%, var(--highlight-soft) 60%);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.main-nav a {
  color: var(--ink-soft);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
}

.main-nav a:hover,
.main-nav a[aria-current='page'] {
  color: var(--pine);
  text-decoration: none;
  border-bottom-color: var(--pine);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  cursor: pointer;
}

.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: '';
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  position: relative;
  transition: transform 0.2s ease;
}

.nav-toggle span::before {
  position: absolute;
  top: -6px;
}

.nav-toggle span::after {
  position: absolute;
  top: 6px;
}

@media (max-width: 820px) {
  .main-nav {
    position: fixed;
    inset: 64px 0 0 0;
    background: var(--paper);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 12px 24px 24px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease, transform 0.15s ease;
    border-top: 1px solid var(--line-soft);
  }

  .main-nav.is-open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .main-nav a {
    width: 100%;
    padding: 14px 0;
    border-bottom: 1px solid var(--line-soft);
  }

  .nav-toggle {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }
}

/* ---------- Hero ---------- */
.hero {
  padding: 64px 0 56px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 36px;
  }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--pine);
  background: var(--pine-tint);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 18px;
}

.hero h1 .highlighted {
  background: linear-gradient(transparent 62%, var(--highlight) 62%);
  padding: 0 2px;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--ink-soft);
  max-width: 46ch;
  margin-bottom: 28px;
}

.hero-ctas {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}

.hero-meta {
  font-size: 0.85rem;
  color: var(--muted);
}

/* Signature element: an "annotated passage" demo card showing a dense
   paragraph on the left, highlighter marks, an arrow, and a clean
   simplified/notes result on the right — the product's core promise
   shown rather than told. */
.demo-card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.demo-card-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 16px;
  background: var(--pine-tint);
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--pine-dark);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.demo-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--line);
}

.demo-body {
  padding: 20px 22px 24px;
}

.demo-source {
  font-family: var(--font-display);
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--ink-soft);
  margin-bottom: 18px;
}

.demo-source mark {
  background: linear-gradient(transparent 55%, var(--highlight) 55%);
  color: var(--ink);
  padding: 0 1px;
}

.demo-arrow {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 14px 0;
}

.demo-arrow::before,
.demo-arrow::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--line);
}

.demo-result {
  background: var(--pine-tint);
  border-radius: var(--radius-md);
  padding: 16px 18px;
}

.demo-result ul {
  margin: 0;
  padding-left: 1.1em;
}

.demo-result li {
  margin-bottom: 6px;
  font-size: 0.94rem;
}

.demo-result li:last-child {
  margin-bottom: 0;
}

/* ---------- Sections ---------- */
.section {
  padding: 56px 0;
}

.section-tight {
  padding: 32px 0;
}

.section-alt {
  background: var(--paper-raised);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.section-head {
  max-width: 640px;
  margin: 0 0 36px;
}

.section-head p {
  color: var(--muted);
}

.section-head.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

/* ---------- Text analyzer (homepage tool) ---------- */
.analyzer {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 24px;
}

.analyzer-input-wrap {
  position: relative;
}

textarea.analyzer-textarea {
  width: 100%;
  min-height: 220px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
}

textarea.analyzer-textarea:focus {
  border-color: var(--pine);
}

.analyzer-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 14px;
}

.analyzer-counts {
  display: flex;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--muted);
}

.analyzer-counts strong {
  color: var(--ink);
}

.analyzer-actions {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.file-upload-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--pine);
  cursor: pointer;
  border: 1px dashed var(--line);
  padding: 8px 14px;
  border-radius: var(--radius-md);
}

.file-upload-label:hover {
  border-color: var(--pine);
}

.usage-note {
  margin-top: 14px;
  font-size: 0.85rem;
  color: var(--muted);
}

.usage-note.limit-reached {
  color: var(--danger);
}

/* ---------- Cards / grids ---------- */
.grid {
  display: grid;
  gap: 20px;
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

@media (max-width: 900px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.tool-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tool-card:hover {
  border-color: var(--pine);
  box-shadow: var(--shadow-sm);
}

.tool-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--pine-tint);
  color: var(--pine);
  display: flex;
  align-items: center;
  justify-content: center;
}

.tool-icon svg {
  width: 20px;
  height: 20px;
}

.tool-card h3 {
  margin-bottom: 2px;
}

.tool-card p {
  color: var(--muted);
  font-size: 0.94rem;
  margin-bottom: 4px;
}

.tool-card .card-link {
  margin-top: auto;
  font-weight: 600;
  font-size: 0.9rem;
}

/* ---------- How it works / steps ---------- */
.steps {
  counter-reset: step;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

@media (max-width: 780px) {
  .steps {
    grid-template-columns: 1fr;
  }
}

.step {
  position: relative;
  padding-top: 8px;
}

.step .step-num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--pine);
  display: block;
  margin-bottom: 8px;
}

/* ---------- Tool page (interface) ---------- */
.tool-hero {
  padding: 40px 0 8px;
}

.breadcrumb {
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 18px;
}

.breadcrumb a {
  color: var(--muted);
}

.breadcrumb a:hover {
  color: var(--pine);
}

.tool-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.tool-options {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.tool-options label {
  font-weight: 600;
  font-size: 0.88rem;
}

.select-wrap select {
  font-family: var(--font-body);
  padding: 9px 32px 9px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%236b7268'/%3E%3C/svg%3E") no-repeat right 12px center;
  appearance: none;
  font-size: 0.9rem;
  color: var(--ink);
  cursor: pointer;
}

.tool-output {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px;
  min-height: 120px;
}

.tool-output-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.tool-output-body {
  white-space: pre-wrap;
  font-size: 0.98rem;
  line-height: 1.7;
}

.tool-output-empty {
  color: var(--muted);
  font-size: 0.94rem;
}

.tool-output-actions {
  display: flex;
  gap: 10px;
  margin-top: 18px;
  flex-wrap: wrap;
}

.demo-flag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--pine-dark);
  background: var(--highlight-soft);
  border-radius: 999px;
  padding: 4px 10px;
  margin-bottom: 14px;
}

.alert {
  border-radius: var(--radius-md);
  padding: 14px 16px;
  font-size: 0.92rem;
  margin-bottom: 16px;
}

.alert-error {
  background: var(--danger-tint);
  color: var(--danger);
  border: 1px solid rgba(179, 69, 46, 0.25);
}

.alert-success {
  background: var(--pine-tint);
  color: var(--pine-dark);
  border: 1px solid rgba(47, 93, 80, 0.2);
}

/* ---------- Tool landing SEO content ---------- */
.tool-info {
  margin-top: 8px;
}

.tool-info h2 {
  margin-top: 2em;
}

.tool-info h2:first-child {
  margin-top: 0;
}

.benefit-list,
.usecase-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.benefit-list li,
.usecase-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 0.96rem;
}

.benefit-list li::before {
  content: '✓';
  color: var(--pine);
  font-weight: 700;
  flex-shrink: 0;
}

.usecase-list li::before {
  content: '›';
  color: var(--highlight);
  background: var(--ink);
  border-radius: 4px;
  width: 18px;
  height: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  flex-shrink: 0;
}

.faq-item {
  border-bottom: 1px solid var(--line-soft);
  padding: 16px 0;
}

.faq-item:first-child {
  border-top: 1px solid var(--line-soft);
}

.faq-item h3 {
  font-size: 1.02rem;
  margin-bottom: 6px;
}

.faq-item p {
  color: var(--ink-soft);
  margin-bottom: 0;
}

.related-tools {
  margin-top: 8px;
}

/* ---------- Forms (contact, admin) ---------- */
.form-field {
  margin-bottom: 18px;
}

.form-field label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 6px;
}

.form-field input[type='text'],
.form-field input[type='email'],
.form-field input[type='password'],
.form-field textarea,
.form-field select {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.96rem;
  background: var(--paper-raised);
  color: var(--ink);
}

.form-field input:focus,
.form-field textarea:focus,
.form-field select:focus {
  border-color: var(--pine);
}

.form-field textarea {
  min-height: 140px;
  resize: vertical;
}

.form-card {
  max-width: 560px;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.checkbox-field {
  display: flex;
  align-items: center;
  gap: 8px;
}

.checkbox-field input {
  width: auto;
}

/* ---------- Ad containers (empty until AdSense is enabled) ---------- */
.ad-container {
  display: block;
  text-align: center;
  margin: 32px auto;
}

.ad-container:empty {
  display: none;
}

.ad-slot-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  color: var(--line);
  letter-spacing: 0.06em;
  padding: 4px 0;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line-soft);
  background: var(--paper-raised);
  padding: 48px 0 28px;
  margin-top: 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}

@media (max-width: 700px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.footer-tagline {
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-col h4 {
  font-family: var(--font-body);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 12px;
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.footer-col a {
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.footer-col a:hover {
  color: var(--pine);
}

.footer-bottom {
  border-top: 1px solid var(--line-soft);
  padding-top: 20px;
  font-size: 0.82rem;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- Misc pages ---------- */
.prose {
  max-width: 72ch;
}

.prose h2 {
  margin-top: 1.8em;
}

.prose ul {
  margin-bottom: 1em;
}

.error-page {
  padding: 100px 0;
  text-align: center;
}

.error-page .eyebrow {
  margin: 0 auto 18px;
}