/* =============================================================
   1. Tokens
   ============================================================= */
:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --surface-alt: #eef2f7;
  --border: #dde3ea;
  --text: #1a2230;
  --text-muted: #5c6b7c;
  --accent: #2f5fd6;
  --accent-dark: #1f45a8;
  --accent-soft: #e9eefc;

  --green: #1f9d55;    --green-bg: #e7f8ee;    --green-border: #bfe8cf;
  --yellow: #92660a;   --yellow-bg: #fff6df;   --yellow-border: #f0dca0;
  --orange: #b4530a;   --orange-bg: #fff0e2;   --orange-border: #f3cda0;
  --red: #c62f3a;      --red-bg: #fdeaec;      --red-border: #f3bcc1;

  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(20,30,50,.05), 0 10px 28px -14px rgba(20,30,50,.16);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --sans: 'Inter', system-ui, -apple-system, "Segoe UI", sans-serif;
  --display: 'Manrope', var(--sans);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10151d;
    --surface: #171e28;
    --surface-alt: #1c2430;
    --border: #2a3341;
    --text: #e9edf3;
    --text-muted: #97a4b5;
    --accent: #6d93ff;
    --accent-dark: #a9c0ff;
    --accent-soft: #1d2a4a;

    --green: #4fd486;    --green-bg: #123425;    --green-border: #1f5c3d;
    --yellow: #e8c05a;   --yellow-bg: #3a2f0d;   --yellow-border: #6b5518;
    --orange: #f0985a;   --orange-bg: #3a2411;   --orange-border: #6b451c;
    --red: #f28c94;      --red-bg: #3a1417;      --red-border: #6b232b;
  }
}

/* =============================================================
   2. Reset & base
   ============================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
html { -webkit-text-size-adjust: 100%; tab-size: 2; scroll-behavior: smooth; }
@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;
}
img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
a { color: inherit; text-decoration: none; }
p { text-wrap: pretty; }
h1, h2, h3, h4 { font-family: var(--display); text-wrap: balance; line-height: 1.15; letter-spacing: -0.01em; }
::selection { background: var(--accent-soft); color: var(--accent-dark); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

/* =============================================================
   3. Utilities
   ============================================================= */
.container { width: 100%; max-width: 1160px; margin-inline: auto; padding-inline: 1.25rem; }
.sr-only { 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: fixed; top: -100px; left: 1rem;
  padding: .6rem 1rem; background: var(--accent); color: #fff;
  z-index: 9999; border-radius: 8px; font-weight: 600;
  transition: top .2s var(--ease-out);
}
.skip-link:focus { top: 1rem; }

/* =============================================================
   4. Header
   ============================================================= */
.site-header { border-bottom: 1px solid var(--border); background: var(--surface); }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding-block: .9rem; }
.brand { display: flex; align-items: center; gap: .55rem; font-family: var(--display); font-weight: 800; font-size: 1.05rem; }
.brand-mark { width: 28px; height: 28px; fill: var(--accent); }
.brand-mark path { stroke: #fff; }
.header-nav { display: flex; gap: 1.5rem; font-size: .92rem; font-weight: 500; color: var(--text-muted); }
.header-nav a:hover { color: var(--accent); }

/* =============================================================
   5. Hero
   ============================================================= */
.hero { padding-block: 2.75rem 1.75rem; text-align: center; max-width: 720px; }
.hero h1 { font-size: clamp(1.9rem, 4.2vw, 2.6rem); }
.hero-subtitle { margin-top: .9rem; color: var(--text-muted); font-size: 1.08rem; }

/* =============================================================
   6. Layout grid (main + sidebar)
   ============================================================= */
.layout { display: grid; grid-template-columns: 1fr; gap: 2rem; align-items: start; padding-bottom: 3rem; }
.layout-main { display: flex; flex-direction: column; gap: 2.25rem; min-width: 0; }
.layout-sidebar { display: none; }

@media (min-width: 960px) {
  .layout { grid-template-columns: 1fr 300px; }
  .layout-sidebar { display: block; position: sticky; top: 1.5rem; }
}

/* =============================================================
   7. Tool card & dropzone
   ============================================================= */
.tool-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 1.5rem; }
.tool-noscript { background: var(--yellow-bg); border: 1px solid var(--yellow-border); color: var(--yellow); padding: .8rem 1rem; border-radius: var(--radius-sm); margin-bottom: 1rem; font-size: .92rem; }

.dropzone { position: relative; border: 2px dashed var(--border); border-radius: var(--radius-sm); padding: 2.25rem 1.25rem; text-align: center; cursor: pointer; transition: border-color .2s var(--ease-out), background .2s var(--ease-out); }
.dropzone:hover, .dropzone:focus-visible { border-color: var(--accent); background: var(--accent-soft); }
.dropzone.is-dragover { border-color: var(--accent); background: var(--accent-soft); }

.dz-state { display: none; }
.tool-card[data-state="idle"] .dz-idle { display: block; }
.tool-card[data-state="loading-engine"] .dz-loading-engine { display: block; }
.tool-card[data-state="error"] .dz-error { display: block; }
.tool-card[data-state="done"] .dz-done { display: block; }

.dz-icon { width: 44px; height: 44px; margin-inline: auto; stroke: var(--accent); fill: none; }
.dz-icon-error { stroke: var(--red); }
.dz-idle p { margin-top: .6rem; }
.dz-formats { color: var(--text-muted); font-size: .85rem; margin-top: .3rem !important; }

.spinner { width: 30px; height: 30px; margin-inline: auto .7rem; border: 3px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.dz-error p { margin-block: .6rem 1rem; color: var(--red); font-weight: 500; }

.result-header { display: flex; align-items: center; gap: 1rem; text-align: left; flex-wrap: wrap; }
.result-thumb { width: 64px; height: 64px; object-fit: cover; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--surface-alt); }
.result-header-text { flex: 1; min-width: 160px; }
.result-filename { font-weight: 600; word-break: break-all; }
.result-dims { color: var(--text-muted); font-size: .92rem; margin-top: .15rem; }
.dims-mp { color: var(--text-muted); }
.btn-reset-inline { margin-left: auto; }

.btn-secondary { border: 1px solid var(--border); background: var(--surface); padding: .5rem .9rem; border-radius: var(--radius-sm); font-weight: 600; font-size: .88rem; transition: border-color .2s var(--ease-out); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

.privacy-badge { display: flex; align-items: center; gap: .5rem; margin-top: 1.1rem; font-size: .85rem; color: var(--text-muted); }
.privacy-badge svg { width: 18px; height: 18px; stroke: var(--green); flex-shrink: 0; }

/* =============================================================
   8. Ad slots (placeholders)
   ============================================================= */
.ad-slot { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: .25rem; min-height: 90px; border: 1px dashed var(--border); border-radius: var(--radius-sm); background: var(--surface-alt); color: var(--text-muted); font-size: .8rem; letter-spacing: .04em; text-transform: uppercase; }
.ad-label { font-weight: 700; }
.ad-size { font-size: .72rem; opacity: .75; text-transform: none; }
.ad-leaderboard { min-height: 90px; }
.ad-in-content { min-height: 90px; }
.ad-sidebar { min-height: 250px; }

.corner-toast { position: fixed; right: 1rem; bottom: 1rem; z-index: 500; width: min(300px, calc(100vw - 2rem)); background: var(--surface); border: 1px dashed var(--border); border-radius: var(--radius-sm); box-shadow: var(--shadow); padding: 1rem; text-align: center; color: var(--text-muted); font-size: .78rem; letter-spacing: .04em; text-transform: uppercase; display: flex; flex-direction: column; gap: .25rem;
  opacity: 0; transform: translateY(12px); pointer-events: none; transition: opacity .3s var(--ease-out), transform .3s var(--ease-out); }
.corner-toast.is-visible { opacity: 1; transform: none; pointer-events: auto; }
.toast-close { position: absolute; top: .3rem; right: .5rem; font-size: 1.1rem; line-height: 1; color: var(--text-muted); padding: .2rem .4rem; }
.toast-close:hover { color: var(--text); }

/* =============================================================
   9. Sections (generic)
   ============================================================= */
section h2 { font-size: 1.5rem; margin-bottom: .5rem; }
.section-lead { color: var(--text-muted); margin-bottom: 1.25rem; max-width: 68ch; }

/* =============================================================
   10. Results table
   ============================================================= */
.unit-toggle { display: inline-flex; border: 1px solid var(--border); border-radius: 999px; padding: 3px; margin-bottom: 1.25rem; background: var(--surface); }
.unit-toggle button { padding: .4rem 1rem; border-radius: 999px; font-weight: 600; font-size: .88rem; color: var(--text-muted); }
.unit-toggle button.is-active { background: var(--accent); color: #fff; }

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); }
.size-table { width: 100%; border-collapse: collapse; min-width: 560px; }
.size-table th { text-align: left; font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; color: var(--text-muted); padding: .8rem 1rem; border-bottom: 1px solid var(--border); background: var(--surface-alt); }
.size-table td { padding: .8rem 1rem; border-bottom: 1px solid var(--border); vertical-align: middle; }
.size-table tr:last-child td { border-bottom: 0; }
.size-table tr[data-size-row] { cursor: pointer; transition: background .15s var(--ease-out); }
.size-table tr[data-size-row]:hover, .size-table tr[data-size-row]:focus-visible { background: var(--accent-soft); }
.size-table tr.is-active { background: var(--accent-soft); }
.table-empty-row td { color: var(--text-muted); text-align: center; padding: 1.5rem 1rem; }

.cell-size strong { display: block; }
.cell-size small { color: var(--text-muted); font-size: .8rem; }
.cell-dpi { font-weight: 700; white-space: nowrap; }
.unit-tag { font-weight: 500; color: var(--text-muted); font-size: .78rem; }
.cell-action { text-align: right; }

.btn-preview { border: 1px solid var(--border); padding: .4rem .8rem; border-radius: var(--radius-sm); font-size: .82rem; font-weight: 600; white-space: nowrap; transition: border-color .15s var(--ease-out), color .15s var(--ease-out); }
.btn-preview:hover { border-color: var(--accent); color: var(--accent); }

/* Quality badges — shared by table, simulator, custom size */
.q-badge { display: inline-flex; align-items: center; gap: .5rem; padding: .35rem .7rem; border-radius: 999px; border: 1px solid; }
.q-icon svg { width: 18px; height: 18px; }
.q-text { display: flex; flex-direction: column; line-height: 1.2; }
.q-text strong { font-size: .85rem; }
.q-text small { font-size: .74rem; opacity: .85; }

.q-green { background: var(--green-bg); border-color: var(--green-border); color: var(--green); }
.q-green svg { fill: var(--green-bg); stroke: var(--green); }
.q-yellow { background: var(--yellow-bg); border-color: var(--yellow-border); color: var(--yellow); }
.q-yellow svg { fill: var(--yellow-bg); stroke: var(--yellow); }
.q-orange { background: var(--orange-bg); border-color: var(--orange-border); color: var(--orange); }
.q-orange svg { fill: var(--orange-bg); stroke: var(--orange); }
.q-red { background: var(--red-bg); border-color: var(--red-border); color: var(--red); }
.q-red svg { fill: var(--red-bg); stroke: var(--red); }

/* =============================================================
   11. Custom size & reverse calculator forms
   ============================================================= */
.custom-size, .reverse-calc, .simulator { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; }

.custom-size-form, .reverse-form { display: flex; flex-wrap: wrap; gap: 1rem; margin-bottom: 1.25rem; }
.custom-size-form label, .reverse-form label { display: flex; flex-direction: column; gap: .35rem; font-size: .85rem; font-weight: 600; color: var(--text-muted); flex: 1 1 140px; }
.input-with-unit { display: flex; align-items: center; border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; background: var(--surface); }
.input-with-unit input, .reverse-form select { border: 0; padding: .6rem .75rem; font-size: 1rem; color: var(--text); background: transparent; width: 100%; font-family: var(--sans); }
.input-with-unit input:focus, .reverse-form select:focus { outline: none; }
.input-with-unit span { padding: .6rem .75rem; background: var(--surface-alt); color: var(--text-muted); font-size: .85rem; border-left: 1px solid var(--border); }
.reverse-form select { border: 1px solid var(--border); border-radius: var(--radius-sm); }

.custom-result-row { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.custom-dpi { font-weight: 800; font-size: 1.1rem; }
.hint { color: var(--text-muted); font-size: .9rem; }

.rev-result-grid { display: flex; gap: 1.5rem; flex-wrap: wrap; margin-bottom: .5rem; }
.rev-stat { display: flex; flex-direction: column; }
.rev-stat-value { font-size: 1.35rem; font-weight: 800; font-family: var(--display); }
.rev-stat-label { color: var(--text-muted); font-size: .82rem; }
.rev-camera-note { color: var(--text-muted); font-size: .92rem; }

/* =============================================================
   12. Simulator
   ============================================================= */
.simulator-frame { display: flex; justify-content: center; padding: 1.25rem; background: var(--surface-alt); border-radius: var(--radius-sm); margin-bottom: 1rem; }
.simulator-frame canvas { border-radius: 6px; box-shadow: 0 4px 18px -8px rgba(20,30,50,.35); background: #fff; }
.simulator-meta { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; margin-bottom: .75rem; }
.sim-dpi-tag { font-weight: 700; color: var(--text-muted); }
.crop-warning { display: flex; align-items: flex-start; gap: .5rem; background: var(--orange-bg); border: 1px solid var(--orange-border); color: var(--orange); padding: .75rem 1rem; border-radius: var(--radius-sm); font-size: .9rem; }
.crop-icon { width: 18px; height: 18px; flex-shrink: 0; fill: var(--orange-bg); stroke: var(--orange); margin-top: .1rem; }

/* =============================================================
   13. How it works / explainer / use cases
   ============================================================= */
.steps { list-style: none; display: grid; gap: 1.5rem; grid-template-columns: repeat(3, 1fr); }
.steps li { display: flex; gap: .9rem; }
.step-num { flex-shrink: 0; width: 34px; height: 34px; display: flex; align-items: center; justify-content: center; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font-weight: 800; font-family: var(--display); }
.steps h3 { font-size: 1.02rem; margin-bottom: .3rem; }
.steps p { color: var(--text-muted); font-size: .92rem; }

.explainer p + p { margin-top: .85rem; }
.explainer { max-width: 74ch; }

.use-case-grid { display: grid; gap: 1.25rem; grid-template-columns: repeat(2, 1fr); }
.use-case-grid article { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 1.1rem 1.25rem; }
.use-case-grid h3 { font-size: 1rem; margin-bottom: .35rem; }
.use-case-grid p { color: var(--text-muted); font-size: .92rem; }

/* =============================================================
   14. FAQ
   ============================================================= */
.faq-list details { border: 1px solid var(--border); border-radius: var(--radius-sm); padding: .9rem 1.1rem; background: var(--surface); margin-bottom: .6rem; }
.faq-list summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; font-size: 1.3rem; color: var(--accent); flex-shrink: 0; transition: transform .2s var(--ease-out); }
.faq-list details[open] summary::after { transform: rotate(45deg); }
.faq-list p { margin-top: .7rem; color: var(--text-muted); font-size: .92rem; }

/* =============================================================
   15. Footer
   ============================================================= */
.site-footer { border-top: 1px solid var(--border); margin-top: 2rem; padding-block: 1.5rem; color: var(--text-muted); font-size: .85rem; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; justify-content: space-between; }
.footer-inner nav { display: flex; gap: 1.25rem; }
.footer-inner a:hover { color: var(--accent); }

/* =============================================================
   16. Responsive
   ============================================================= */
@media (max-width: 720px) {
  .steps { grid-template-columns: 1fr; }
  .use-case-grid { grid-template-columns: 1fr; }
  .custom-size-form label, .reverse-form label { flex: 1 1 100%; }
  .result-header { flex-direction: column; align-items: flex-start; }
  .btn-reset-inline { margin-left: 0; }
  .corner-toast { left: 1rem; right: 1rem; width: auto; }
}

@media (min-width: 540px) {
  .container { padding-inline: 1.5rem; }
}