/* =============================================================
   1. Tokens
   ============================================================= */
:root {
  --bg: #faf9f7;
  --bg-elevated: #ffffff;
  --text: #17181c;
  --text-dim: #55585f;
  --border: #e4e2dd;
  --accent: #3d5afe;
  --accent-ink: #ffffff;
  --accent-soft: #eaedff;
  --success: #1a8f5e;
  --success-soft: #e6f6ee;
  --error: #c4392f;
  --error-soft: #fbeae8;
  --radius: 14px;
  --radius-sm: 9px;
  --sans: "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-card: 0 1px 2px rgba(20, 20, 30, 0.04), 0 10px 30px -12px rgba(20, 20, 30, 0.12);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12141c;
    --bg-elevated: #1a1d27;
    --text: #f2f1ee;
    --text-dim: #a3a6b0;
    --border: #2a2d38;
    --accent: #7c8cff;
    --accent-ink: #12141c;
    --accent-soft: #232742;
    --success: #4fd399;
    --success-soft: #163329;
    --error: #ff7a70;
    --error-soft: #3a1f1d;
    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.2), 0 20px 40px -16px rgba(0, 0, 0, 0.5);
  }
}

/* =============================================================
   2. Reset & base
   ============================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
html { -webkit-text-size-adjust: 100%; tab-size: 2; scroll-behavior: smooth; overflow-x: clip; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
  overscroll-behavior-y: none;
}
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
a { color: inherit; text-decoration: none; }
p { text-wrap: pretty; }
h1, h2, h3 { text-wrap: balance; line-height: 1.1; letter-spacing: -0.02em; }
::selection { background: var(--accent); color: var(--accent-ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.skip-link {
  position: fixed; top: -100px; left: 1rem;
  padding: .6rem 1rem; background: var(--accent); color: var(--accent-ink);
  z-index: 9999; border-radius: 8px; font-weight: 600;
}
.skip-link:focus { top: 1rem; }

/* =============================================================
   3. Utilities
   ============================================================= */
.container { width: 100%; max-width: 760px; margin-inline: auto; padding-inline: 1.25rem; }

/* =============================================================
   4. Header / footer
   ============================================================= */
.site-header { padding-block: 1.1rem; border-bottom: 1px solid var(--border); }
.header-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; max-width: 1000px; }
.logo { display: flex; align-items: center; gap: .5rem; font-weight: 800; font-size: 1.15rem; }
.header-nav { display: none; gap: 1.4rem; font-weight: 600; font-size: .92rem; color: var(--text-dim); }
.header-nav a:hover { color: var(--accent); }
@media (min-width: 720px) { .header-nav { display: flex; } }

.site-footer { border-top: 1px solid var(--border); padding-block: 1.6rem 2.2rem; margin-top: 2.5rem; color: var(--text-dim); font-size: .88rem; }
.footer-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .75rem; margin-bottom: .6rem; }
.footer-nav { display: flex; gap: 1rem; }
.footer-nav a:hover { color: var(--accent); }
.credits { font-size: .78rem; opacity: .7; }

/* =============================================================
   5. Hero
   ============================================================= */
.hero { max-width: 1000px; padding-block: 2.4rem 1.6rem; text-align: center; }
.hero h1 { font-size: clamp(1.7rem, 4.2vw, 2.6rem); max-width: 22ch; margin-inline: auto; }
.hero-sub { color: var(--text-dim); font-size: 1.05rem; max-width: 44ch; margin: .9rem auto 0; }

/* =============================================================
   6. Mode tabs
   ============================================================= */
.tool-section { max-width: 1000px; padding-block: 0 1rem; }
.mode-tabs { display: flex; gap: .4rem; overflow-x: auto; overflow-y: visible; padding-bottom: .3rem; margin-bottom: 1rem; scrollbar-width: none; }
.mode-tabs::-webkit-scrollbar { display: none; }
.mode-tab {
  flex: 0 0 auto; padding: .6rem 1.05rem; border-radius: 999px; font-weight: 700; font-size: .92rem;
  background: var(--bg-elevated); border: 1px solid var(--border); color: var(--text-dim);
  transition: background .2s var(--ease-out), color .2s var(--ease-out), border-color .2s var(--ease-out);
  white-space: nowrap;
}
.mode-tab:hover { color: var(--text); }
.mode-tab.is-active { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

/* =============================================================
   7. Tool card
   ============================================================= */
.tool-card {
  background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-card); padding: 1.4rem; position: relative;
}
.tool-panel { display: none; }
.tool-panel.is-active { display: block; }

.dropzone {
  display: flex; flex-direction: column; align-items: center; gap: .5rem; text-align: center;
  border: 2px dashed var(--border); border-radius: var(--radius-sm); padding: 2.4rem 1.2rem;
  cursor: pointer; color: var(--text-dim);
  transition: border-color .2s var(--ease-out), background .2s var(--ease-out);
}
.dropzone:hover, .dropzone:focus-visible, .dropzone.is-dragover { border-color: var(--accent); background: var(--accent-soft); }
.dz-icon { color: var(--accent); }
.dz-title { font-weight: 700; color: var(--text); font-size: 1.02rem; }
.dz-hint { font-size: .85rem; }

.file-list { list-style: none; margin-top: 1rem; display: flex; flex-direction: column; gap: .5rem; }
.file-list:empty { margin-top: 0; }
.file-list li {
  display: flex; align-items: center; gap: .6rem; background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: .55rem .7rem; font-size: .88rem;
}
.file-list .fl-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; }
.file-list .fl-size { color: var(--text-dim); font-family: var(--mono); font-size: .78rem; flex-shrink: 0; }
.file-list button { padding: .3rem .4rem; border-radius: 6px; color: var(--text-dim); flex-shrink: 0; }
.file-list button:hover { background: var(--accent-soft); color: var(--accent); }

.file-chip {
  display: inline-flex; align-items: center; gap: .5rem; background: var(--accent-soft); color: var(--accent);
  font-weight: 600; font-size: .88rem; padding: .5rem .8rem; border-radius: var(--radius-sm); margin-bottom: 1.1rem;
  word-break: break-all;
}

.tool-form { margin-top: .2rem; }
.field { margin-block: 1rem; }
.field label { display: block; font-weight: 700; font-size: .88rem; margin-bottom: .4rem; }
.field input[type="text"] {
  width: 100%; padding: .7rem .85rem; border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: var(--bg); color: var(--text); font-size: .95rem; font-family: var(--mono);
}
.field input[type="text"]:focus-visible { border-color: var(--accent); }
.field input[type="range"] { width: 100%; accent-color: var(--accent); }
.field-hint { font-size: .8rem; color: var(--text-dim); margin-top: .35rem; }
.range-labels { display: flex; justify-content: space-between; font-size: .78rem; color: var(--text-dim); margin-top: .25rem; }
.field-row { display: grid; grid-template-columns: 1fr; gap: .5rem 1rem; }
@media (min-width: 540px) { .field-row { grid-template-columns: 1fr 1fr; } }
.radio-field { display: flex; align-items: center; gap: .5rem; font-weight: 600; font-size: .9rem; cursor: pointer; }
.radio-field input { accent-color: var(--accent); width: 1.05rem; height: 1.05rem; }

.tool-actions { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 1.2rem; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .75rem 1.3rem; border-radius: 999px; font-weight: 700; font-size: .95rem;
  transition: transform .15s var(--ease-out), background .2s var(--ease-out), opacity .2s var(--ease-out);
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { opacity: .92; }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }
.btn-ghost { background: var(--bg); border: 1px solid var(--border); color: var(--text-dim); }
.btn-ghost:hover { color: var(--text); border-color: var(--text-dim); }
.btn-text { color: var(--accent); font-weight: 600; padding: .5rem; }
.btn-big { width: 100%; padding: 1rem; font-size: 1.05rem; }

/* progress / result / error share the card, replace the panel */
.tool-progress, .tool-result, .tool-error { text-align: center; padding-block: 1rem; }
.progress-bar { height: 8px; border-radius: 999px; background: var(--border); overflow: hidden; margin-bottom: .8rem; }
.progress-fill { height: 100%; width: 0%; background: var(--accent); border-radius: 999px; transition: width .25s var(--ease-out); }
[data-progress-label] { color: var(--text-dim); font-size: .9rem; }

.result-icon {
  width: 52px; height: 52px; border-radius: 50%; background: var(--success-soft); color: var(--success);
  display: flex; align-items: center; justify-content: center; font-size: 1.5rem; font-weight: 800;
  margin: 0 auto .8rem;
}
.result-title { font-weight: 800; font-size: 1.15rem; margin-bottom: .3rem; }
.result-meta { color: var(--text-dim); font-size: .9rem; margin-bottom: 1.1rem; }
.result-meta .win { color: var(--success); font-weight: 700; }

.tool-error p { color: var(--error); font-weight: 600; margin-bottom: 1rem; }
.tool-warning { text-align: center; padding-block: 1rem; }
.tool-warning p { color: var(--text); background: var(--accent-soft); border-radius: var(--radius-sm); padding: .9rem 1rem; margin-bottom: 1rem; font-size: .92rem; }

/* card state visibility rules */
.tool-card[data-state="idle"] .tool-progress,
.tool-card[data-state="idle"] .tool-result,
.tool-card[data-state="idle"] .tool-error,
.tool-card[data-state="idle"] .tool-warning { display: none; }
.tool-card[data-state="working"] .tool-panel,
.tool-card[data-state="working"] .tool-result,
.tool-card[data-state="working"] .tool-error,
.tool-card[data-state="working"] .tool-warning { display: none; }
.tool-card[data-state="done"] .tool-panel,
.tool-card[data-state="done"] .tool-progress,
.tool-card[data-state="done"] .tool-error,
.tool-card[data-state="done"] .tool-warning { display: none; }
.tool-card[data-state="error"] .tool-panel,
.tool-card[data-state="error"] .tool-progress,
.tool-card[data-state="error"] .tool-result,
.tool-card[data-state="error"] .tool-warning { display: none; }
.tool-card[data-state="warning"] .tool-panel,
.tool-card[data-state="warning"] .tool-progress,
.tool-card[data-state="warning"] .tool-result,
.tool-card[data-state="warning"] .tool-error { display: none; }

.privacy-badge, .limits-note { text-align: center; font-size: .85rem; color: var(--text-dim); margin-top: .9rem; }
.limits-note { margin-top: .3rem; }

/* =============================================================
   8. Ad slots
   ============================================================= */
.ad-slot {
  max-width: 1000px; margin: 2rem auto; min-height: 90px; border: 1px dashed var(--border);
  border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center;
  color: var(--text-dim); font-size: .78rem; letter-spacing: .04em; text-transform: uppercase;
}

/* =============================================================
   9. How it works / SEO / FAQ
   ============================================================= */
.how-it-works, .seo-copy, .faq { padding-block: 1.6rem; }
.how-it-works h2, .seo-copy h2, .faq h2 { font-size: 1.4rem; margin-bottom: 1.1rem; }
.steps { list-style: none; display: flex; flex-direction: column; gap: 1.1rem; }
.steps li { display: flex; gap: 1rem; align-items: flex-start; }
.step-num {
  flex-shrink: 0; width: 30px; height: 30px; border-radius: 50%; background: var(--accent-soft); color: var(--accent);
  display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: .9rem;
}
.steps strong { display: block; margin-bottom: .2rem; }
.steps p { color: var(--text-dim); font-size: .92rem; }

.seo-copy p { color: var(--text-dim); margin-bottom: 1rem; font-size: .96rem; }
.seo-copy p:last-child { margin-bottom: 0; }
.seo-copy strong { color: var(--text); }

.faq details {
  border-bottom: 1px solid var(--border); padding-block: .9rem;
}
.faq summary {
  cursor: pointer; font-weight: 700; list-style: none; display: flex; justify-content: space-between; gap: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--accent); font-weight: 800; flex-shrink: 0; }
.faq details[open] summary::after { content: "−"; }
.faq p { color: var(--text-dim); margin-top: .6rem; font-size: .92rem; }

/* =============================================================
   10. Responsive
   ============================================================= */
@media (max-width: 539px) {
  .tool-card { padding: 1rem; }
  .dropzone { padding: 1.8rem 1rem; }
}