/* ==========================================================================
   STYLE.CSS — Global layout & components
   ========================================================================== */

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--surface-bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background var(--duration-med) var(--ease-out), color var(--duration-med) var(--ease-out);
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; margin: 0; padding: 0; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; line-height: 1.15; margin: 0 0 var(--space-3); color: var(--text-primary); }
p { margin: 0 0 var(--space-4); color: var(--text-secondary); }

/* ---- Accessibility helpers ---- */
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; top: -60px; left: var(--space-4);
  background: var(--color-ink); color: var(--text-inverse);
  padding: var(--space-3) var(--space-5); border-radius: var(--radius-sm);
  z-index: 1000; transition: top var(--duration-fast);
}
.skip-link:focus { top: var(--space-4); }
:focus-visible {
  outline: 2px solid var(--color-teal);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---- Layout containers ---- */
.hero, .features, .how-it-works, .benefits, .faq,
.page-hero, .content-block, .workspace, .history-section {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--space-5);
  padding-right: var(--space-5);
}

/* ==========================================================================
   HEADER / NAV
   ========================================================================== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--surface-glass);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid var(--color-border);
}
.nav-bar {
  max-width: var(--container-max);
  margin: 0 auto;
  height: var(--header-height);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--space-5);
  gap: var(--space-5);
}
.logo {
  display: flex; align-items: center; gap: var(--space-2);
  font-family: var(--font-display); font-weight: 700; font-size: 1.25rem;
  color: var(--text-primary); flex-shrink: 0;
}
.logo-mark {
  width: 22px; height: 22px; border-radius: 6px;
  background: linear-gradient(135deg, var(--color-teal), var(--color-highlight));
  display: inline-block;
}
.nav-links {
  display: flex; gap: var(--space-6); flex: 1; justify-content: center;
}
.nav-links a {
  font-weight: 700; font-size: 0.95rem; color: var(--text-secondary);
  padding: var(--space-2) 0; position: relative;
  transition: color var(--duration-fast);
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--color-teal-dark); }
.nav-links a[aria-current="page"]::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -4px;
  height: 2px; background: var(--color-teal);
  border-radius: var(--radius-full);
}
.nav-actions { display: flex; align-items: center; gap: var(--space-4); }
.theme-toggle {
  width: 38px; height: 38px; border-radius: var(--radius-full);
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--color-border); color: var(--text-secondary);
  transition: background var(--duration-fast), color var(--duration-fast);
}
.theme-toggle:hover { background: var(--color-teal-light); color: var(--color-teal-dark); }
.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

.nav-toggle {
  display: none; flex-direction: column; gap: 5px; width: 32px; height: 32px;
  align-items: center; justify-content: center;
}
.nav-toggle span {
  width: 22px; height: 2px; background: var(--text-primary); border-radius: 2px;
  transition: transform var(--duration-fast), opacity var(--duration-fast);
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  padding: 0.85rem 1.6rem; border-radius: var(--radius-full);
  font-weight: 700; font-size: 0.95rem; white-space: nowrap;
  transition: transform var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast), background var(--duration-fast), opacity var(--duration-fast);
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-primary {
  background: var(--color-ink); color: var(--text-inverse);
  box-shadow: var(--shadow-sm);
}
.btn-primary:not(:disabled):hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
[data-theme="dark"] .btn-primary { background: var(--color-teal); color: var(--text-on-accent); }
.btn-secondary {
  background: var(--color-teal-light); color: var(--color-teal-dark);
}
.btn-secondary:not(:disabled):hover { background: var(--color-teal); color: #fff; }
.btn-ghost {
  background: transparent; color: var(--text-primary); border: 1px solid var(--color-border);
}
.btn-ghost:not(:disabled):hover { background: var(--color-border); }
.btn-small { padding: 0.6rem 1.2rem; font-size: 0.875rem; }
.btn-icon {
  background: var(--surface-card); border: 1px solid var(--color-border);
  padding: 0.6rem 1rem; border-radius: var(--radius-md); font-size: 0.85rem; font-weight: 700;
}
.btn-icon:not(:disabled):hover { border-color: var(--color-teal); color: var(--color-teal-dark); }

/* ==========================================================================
   GLASSMORPHISM CARD
   ========================================================================== */
.glass {
  background: var(--surface-glass);
  border: 1px solid var(--surface-glass-border);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  box-shadow: var(--shadow-glass);
  border-radius: var(--radius-lg);
}

/* ==========================================================================
   HERO (Home)
   ========================================================================== */
.hero {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-8);
  align-items: center; padding-top: var(--space-9); padding-bottom: var(--space-9);
}
.eyebrow {
  font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.08em;
  font-size: 0.8rem; font-weight: 500; color: var(--color-teal-dark); margin-bottom: var(--space-3);
}
.hero h1 {
  font-size: clamp(2.5rem, 5vw, 3.75rem); margin-bottom: var(--space-4);
}
.highlight-word {
  background: linear-gradient(180deg, transparent 60%, var(--color-highlight-soft) 60%);
  color: var(--color-ink); position: relative;
}
[data-theme="dark"] .highlight-word { color: var(--color-highlight); background: none; }
.hero-sub { font-size: 1.125rem; max-width: 46ch; margin-bottom: var(--space-5); }
.hero-cta { display: flex; gap: var(--space-4); flex-wrap: wrap; margin-bottom: var(--space-5); }
.hero-trust { display: flex; gap: var(--space-5); flex-wrap: wrap; }
.hero-trust li {
  font-size: 0.85rem; font-weight: 700; color: var(--text-secondary);
  display: flex; align-items: center; gap: var(--space-2);
}
.hero-trust li::before { content: "✓"; color: var(--color-teal); font-weight: 700; }

.hero-visual { display: flex; justify-content: center; }
.scan-card {
  width: 100%; max-width: 440px; border-radius: var(--radius-lg);
  background: var(--surface-card); box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border); overflow: hidden;
}
.scan-card-header {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-4); border-bottom: 1px solid var(--color-border);
}
.scan-card-header .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--color-border); }
.scan-card-title {
  font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-secondary);
  margin-left: var(--space-2);
}
.scan-body { position: relative; padding: var(--space-5); overflow: hidden; }
.scan-text-raw {
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-secondary);
  opacity: 0.55; margin-bottom: var(--space-4);
}
.scan-text-clear { font-size: 0.95rem; color: var(--text-primary); margin: 0; }
.scan-text-clear mark {
  background: var(--color-highlight-soft); color: inherit; padding: 0 3px; border-radius: 3px;
}

/* ==========================================================================
   SECTION HEAD
   ========================================================================== */
.section-head { text-align: center; max-width: 640px; margin: 0 auto var(--space-7); }
.section-head h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); }
.features, .how-it-works, .benefits, .faq { padding-top: var(--space-8); padding-bottom: var(--space-8); }

/* ==========================================================================
   FEATURES
   ========================================================================== */
.feature-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5);
}
.feature-card { padding: var(--space-6); transition: transform var(--duration-med) var(--ease-out); }
.feature-card:hover { transform: translateY(-6px); }
.feature-icon {
  width: 48px; height: 48px; border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center; font-size: 1.4rem;
  background: var(--color-teal-light); margin-bottom: var(--space-4);
}
.feature-card h3 { font-size: 1.15rem; margin-bottom: var(--space-2); }
.feature-card p { margin: 0; font-size: 0.95rem; }

/* ==========================================================================
   HOW IT WORKS
   ========================================================================== */
.steps {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-5);
  counter-reset: step;
}
.step { position: relative; padding-top: var(--space-5); border-top: 2px solid var(--color-border); }
.step-number {
  font-family: var(--font-mono); font-size: 0.85rem; font-weight: 500;
  color: var(--color-teal-dark); display: block; margin-bottom: var(--space-3);
}
.step h3 { font-size: 1.05rem; margin-bottom: var(--space-2); }
.step p { font-size: 0.9rem; margin: 0; }

/* ==========================================================================
   BENEFITS
   ========================================================================== */
.benefits-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-5); }
.benefit {
  padding: var(--space-5); border-left: 3px solid var(--color-teal);
  background: var(--surface-card); border-radius: var(--radius-sm);
}
.benefit h3 { font-size: 1.05rem; margin-bottom: var(--space-2); }
.benefit p { margin: 0; font-size: 0.9rem; }

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq-list { max-width: 720px; margin: 0 auto; display: flex; flex-direction: column; gap: var(--space-3); }
.faq-item {
  background: var(--surface-card); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); padding: var(--space-4) var(--space-5);
}
.faq-item summary {
  cursor: pointer; font-weight: 700; font-size: 1rem; list-style: none;
  display: flex; justify-content: space-between; align-items: center;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; font-size: 1.3rem; color: var(--color-teal-dark); flex-shrink: 0; margin-left: var(--space-3);
  transition: transform var(--duration-fast);
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { margin-top: var(--space-3); margin-bottom: 0; font-size: 0.95rem; }

/* ==========================================================================
   PAGE HERO (About / Contact)
   ========================================================================== */
.page-hero {
  max-width: 800px; margin: 0 auto; text-align: center;
  padding: var(--space-9) var(--space-5) var(--space-7);
}
.page-hero h1 { font-size: clamp(2rem, 4.5vw, 3rem); }
.page-hero-sub { font-size: 1.1rem; max-width: 55ch; margin: 0 auto; }

.content-block { padding: var(--space-7) var(--space-5); }
.content-block.alt { background: var(--surface-card); }
.content-narrow { max-width: 720px; margin: 0 auto; }
.content-narrow h2 { margin-top: var(--space-6); font-size: 1.4rem; }
.content-narrow h2:first-child { margin-top: 0; }
.tech-list li {
  padding: var(--space-3) 0; border-bottom: 1px solid var(--color-border);
  color: var(--text-secondary); font-size: 0.95rem;
}

/* ==========================================================================
   CONTACT
   ========================================================================== */
.contact-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: var(--space-6); max-width: var(--container-max); margin: 0 auto; padding: 0 var(--space-5); }
.contact-form { padding: var(--space-6); display: flex; flex-direction: column; gap: var(--space-4); }
.form-field { display: flex; flex-direction: column; gap: var(--space-2); }
.form-field label { font-weight: 700; font-size: 0.9rem; }
.form-field input, .form-field textarea {
  padding: var(--space-3) var(--space-4); border-radius: var(--radius-sm);
  border: 1px solid var(--color-border); background: var(--surface-bg); color: var(--text-primary);
  resize: vertical;
}
.form-field input:focus, .form-field textarea:focus { border-color: var(--color-teal); }
.form-status { font-size: 0.9rem; color: var(--color-teal-dark); min-height: 1.2em; margin: 0; }
.contact-info { padding: var(--space-6); }
.contact-info ul { display: flex; flex-direction: column; gap: var(--space-5); }
.contact-info li { color: var(--text-secondary); }
.contact-info strong { color: var(--text-primary); display: block; margin-bottom: var(--space-1); }

/* ==========================================================================
   WORKSPACE PAGE
   ========================================================================== */
.workspace { padding-top: var(--space-7); padding-bottom: var(--space-8); }
.workspace-header { text-align: center; max-width: 640px; margin: 0 auto var(--space-7); }
.workspace-header h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
.workspace-sub { margin: 0; }

.workspace-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-5); align-items: start;
}
.panel { padding: var(--space-5); display: flex; flex-direction: column; gap: var(--space-4); }

.dropzone {
  border: 2px dashed var(--color-border); border-radius: var(--radius-md);
  padding: var(--space-7) var(--space-5); text-align: center; cursor: pointer;
  color: var(--text-secondary); transition: border-color var(--duration-fast), background var(--duration-fast);
}
.dropzone svg { margin: 0 auto var(--space-3); }
.dropzone:hover, .dropzone:focus-visible, .dropzone.drag-over {
  border-color: var(--color-teal); background: var(--color-teal-light);
}
.dropzone-text { margin: 0 0 var(--space-1); font-weight: 700; color: var(--text-primary); }
.dropzone-hint { margin: 0; font-size: 0.85rem; }

.preview-area { display: flex; flex-direction: column; align-items: center; gap: var(--space-3); }
.image-preview { max-height: 220px; border-radius: var(--radius-md); box-shadow: var(--shadow-sm); }

.panel-divider { height: 1px; background: var(--color-border); }

.source-text-block { display: flex; flex-direction: column; gap: var(--space-3); flex: 1; min-height: 0; }
.source-text-header { display: flex; align-items: center; justify-content: space-between; }
.source-text-header h3 { font-size: 1rem; margin: 0; }
.status-pill {
  font-family: var(--font-mono); font-size: 0.72rem; padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full); background: var(--color-border); color: var(--text-secondary);
}
.status-pill.busy { background: var(--color-highlight-soft); color: #8a6d00; }
.status-pill.ready { background: var(--color-teal-light); color: var(--color-teal-dark); }
.status-pill.error { background: rgba(228, 87, 46, 0.15); color: var(--color-danger); }

.source-text-body, .result-output {
  background: var(--surface-card); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); padding: var(--space-4); min-height: 160px;
  max-height: 320px; overflow-y: auto; font-size: 0.95rem;
}
.source-text-body { font-family: var(--font-mono); font-size: 0.85rem; white-space: pre-wrap; }
.empty-state { color: var(--text-secondary); font-style: italic; margin: 0; }

.panel-actions { display: flex; gap: var(--space-3); flex-wrap: wrap; }

.results-toolbar { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); flex-wrap: wrap; }
.tabs { display: flex; gap: var(--space-2); background: var(--surface-card); padding: 4px; border-radius: var(--radius-full); border: 1px solid var(--color-border); }
.tab {
  padding: var(--space-2) var(--space-4); border-radius: var(--radius-full); font-weight: 700;
  font-size: 0.85rem; color: var(--text-secondary); transition: background var(--duration-fast), color var(--duration-fast);
}
.tab[aria-selected="true"] { background: var(--color-ink); color: var(--text-inverse); }
[data-theme="dark"] .tab[aria-selected="true"] { background: var(--color-teal); color: var(--text-on-accent); }
.translate-control select {
  padding: var(--space-2) var(--space-3); border-radius: var(--radius-sm);
  border: 1px solid var(--color-border); background: var(--surface-bg); color: var(--text-primary);
}

.result-toolbar-actions { display: flex; gap: var(--space-3); flex-wrap: wrap; }

.history-section { padding-top: var(--space-7); }
.history-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-4); }
.history-header h2 { margin: 0; font-size: 1.3rem; }
.history-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: var(--space-4); }
.history-card {
  background: var(--surface-card); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); padding: var(--space-4); cursor: pointer;
  transition: border-color var(--duration-fast), transform var(--duration-fast);
}
.history-card:hover { border-color: var(--color-teal); transform: translateY(-3px); }
.history-card-title { font-weight: 700; font-size: 0.9rem; margin-bottom: var(--space-1); }
.history-card-date { font-size: 0.78rem; color: var(--text-secondary); font-family: var(--font-mono); }

/* ==========================================================================
   TOAST
   ========================================================================== */
.toast {
  position: fixed; bottom: var(--space-5); left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--color-ink); color: var(--text-inverse); padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-full); box-shadow: var(--shadow-lg); font-size: 0.9rem; font-weight: 700;
  opacity: 0; pointer-events: none; transition: opacity var(--duration-med), transform var(--duration-med);
  z-index: 1000;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); pointer-events: auto; }

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer { border-top: 1px solid var(--color-border); margin-top: var(--space-8); }
.footer-top {
  max-width: var(--container-max); margin: 0 auto; padding: var(--space-7) var(--space-5) var(--space-5);
  display: flex; justify-content: space-between; gap: var(--space-6); flex-wrap: wrap;
}
.footer-brand p { max-width: 32ch; margin-top: var(--space-3); }
.footer-links { display: flex; gap: var(--space-7); }
.footer-links h4 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: var(--space-3); }
.footer-links a { display: block; color: var(--text-secondary); padding: var(--space-1) 0; font-size: 0.9rem; }
.footer-links a:hover { color: var(--color-teal-dark); }
.footer-bottom {
  max-width: var(--container-max); margin: 0 auto; padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border); font-size: 0.85rem; color: var(--text-secondary);
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 960px) {
  .hero { grid-template-columns: 1fr; padding-top: var(--space-7); }
  .hero-visual { order: -1; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .benefits-grid { grid-template-columns: 1fr; }
  .workspace-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  .nav-links {
    position: fixed; top: var(--header-height); left: 0; right: 0;
    flex-direction: column; background: var(--surface-card); padding: var(--space-5);
    gap: var(--space-4); border-bottom: 1px solid var(--color-border);
    transform: translateY(-120%); opacity: 0; transition: transform var(--duration-med) var(--ease-out), opacity var(--duration-med);
    box-shadow: var(--shadow-md);
  }
  .nav-links.open { transform: translateY(0); opacity: 1; }
  .nav-toggle { display: flex; }
  .nav-actions .btn-primary.btn-small { display: none; }
  .feature-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .footer-top { flex-direction: column; }
}

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