:root {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --ink: #142033;
  --muted: #65748b;
  --line: #dbe3ef;
  --primary: #2f6df6;
  --primary-dark: #1d4ed8;
  --danger: #d43636;
  --warning: #b7791f;
  --success: #14855a;
  --shadow: 0 18px 45px rgba(20, 32, 51, .10);
}

* { box-sizing: border-box; }
body { margin: 0; font-family: Inter, "Segoe UI", Arial, sans-serif; color: var(--ink); background: var(--bg); }
a { color: inherit; text-decoration: none; }
button, select { font: inherit; }

.hero { padding: 24px clamp(20px, 5vw, 72px) 56px; color: #fff; background: radial-gradient(circle at 20% 20%, #4f8cff, transparent 30%), linear-gradient(135deg, #101827, #1d3764 70%, #245edb); }
.topbar, .hero__content, .page-shell { max-width: 1240px; margin: 0 auto; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-bottom: 56px; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 800; letter-spacing: .02em; }
.brand__mark { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 14px; background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.25); }
.topbar__links { display: flex; gap: 18px; color: rgba(255,255,255,.78); font-size: 14px; }
.hero__content { display: grid; grid-template-columns: minmax(0, 1fr); gap: 48px; align-items: center; }
.eyebrow { margin: 0 0 8px; text-transform: uppercase; letter-spacing: .14em; font-size: 12px; font-weight: 800; color: var(--primary); }
.hero .eyebrow { color: #9fc2ff; }
h1, h2, h3 { margin: 0; line-height: 1.15; }
h1 { font-size: clamp(36px, 5vw, 62px); max-width: 820px; }
h2 { font-size: clamp(24px, 3vw, 34px); }
h3 { font-size: 18px; margin-bottom: 14px; }
.hero__lead { color: rgba(255,255,255,.78); font-size: 18px; line-height: 1.7; max-width: 720px; }

.upload-card, .panel, .step-card { background: rgba(255,255,255,.96); color: var(--ink); border: 1px solid rgba(255,255,255,.5); border-radius: 28px; box-shadow: var(--shadow); }
.upload-card { padding: 22px; }
.file-drop { min-height: 220px; min-width: 0; border: 2px dashed #b8c7dd; border-radius: 22px; display: grid; place-items: center; text-align: center; padding: 24px; cursor: pointer; background: #f8fbff; }
.file-drop.dragover { border-color: var(--primary); background: #eef5ff; }
.file-drop input { display: none; }
.file-drop__icon { display: grid; place-items: center; width: 70px; height: 70px; border-radius: 20px; margin-bottom: 12px; color: #fff; background: linear-gradient(135deg, #2f6df6, #7c3aed); font-weight: 900; }
#file-title, #file-hint { max-width: 100%; overflow: hidden; text-overflow: ellipsis; overflow-wrap: anywhere; }
#file-hint { color: var(--muted); margin-top: 4px; }

.analysis-sidebar { display: grid; gap: 18px; align-self: start; }
.settings-panel { position: sticky; top: 82px; align-self: start; z-index: 2; padding: 16px; border: 1px solid var(--line); border-radius: 22px; background: rgba(255,255,255,.94); box-shadow: var(--shadow); backdrop-filter: blur(8px); }
.settings-panel h3 { margin-bottom: 12px; }
.settings-panel label { display: grid; gap: 8px; margin-top: 14px; color: var(--muted); font-size: 13px; }
.settings-panel input { width: 100%; }
.page-shell { padding: 32px clamp(20px, 5vw, 72px) 72px; }
.step-grid { position: sticky; top: 0; z-index: 11; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin: -72px 0 28px; padding: 10px 0; transition: .2s ease; }
.step-grid.is-collapsed { gap: 10px; margin-top: 0; background: rgba(244,247,251,.92); backdrop-filter: blur(10px); border-bottom: 1px solid rgba(219,227,239,.8); }
.step-card { padding: 20px; cursor: pointer; transition: .2s ease; }
.step-grid.is-collapsed .step-card { display: grid; grid-template-columns: auto 1fr; gap: 8px 10px; align-items: center; padding: 10px 12px; border-radius: 18px; }
.step-grid.is-collapsed .step-card p { display: none; }
.step-grid.is-collapsed .step-card span { width: 28px; height: 28px; margin-bottom: 0; border-radius: 10px; }
.step-grid.is-collapsed .step-card strong { font-size: 14px; }
.step-card span { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 12px; background: #edf4ff; color: var(--primary); font-weight: 900; margin-bottom: 14px; }
.step-card p { color: var(--muted); margin: 8px 0 0; }
.step-card.is-active { outline: 2px solid var(--primary); }
.step-card.is-done span { background: #e7f8f1; color: var(--success); font-size: 0; }
.step-card.is-done span::before { content: "✓"; font-size: 18px; }
.step-card.is-done { border-color: rgba(20, 133, 90, .35); }

.panel { padding: 26px; margin-bottom: 24px; }
.panel--analysis { display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 24px; align-items: start; }
.analysis-content { min-width: 0; }
.panel__header { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 24px; }
.panel__controls, .actions { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
select { border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; background: #fff; }
.button { border: 1px solid var(--line); background: #fff; color: var(--ink); border-radius: 14px; padding: 11px 16px; cursor: pointer; font-weight: 700; transition: .18s ease; }
.button:hover:not(:disabled) { transform: translateY(-1px); box-shadow: 0 10px 24px rgba(20,32,51,.10); }
.button:disabled { opacity: .55; cursor: not-allowed; }
.button--primary { border-color: var(--primary); background: var(--primary); color: #fff; }
.button--primary:hover:not(:disabled) { background: var(--primary-dark); }
.button--ghost { background: transparent; }
.status { margin-top: 16px; color: var(--muted); font-size: 14px; }
.status.is-busy::before { content: ""; display: inline-block; width: 12px; height: 12px; border: 2px solid #c7d5ea; border-top-color: var(--primary); border-radius: 50%; margin-right: 8px; vertical-align: -2px; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.report-grid, .details-grid, .viewer-grid, .compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.report-grid--single, .details-grid--wide { grid-template-columns: 1fr; }
.report-card, .details-grid article, .viewer-grid article, .compare-grid article, .compare-pane { border: 1px solid var(--line); border-radius: 22px; padding: 18px; background: #fbfdff; min-width: 0; }
.report-card__head { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 14px; }
pre { white-space: pre-wrap; word-break: break-word; color: #253247; margin: 0; font-family: "Cascadia Mono", Consolas, monospace; font-size: 13px; line-height: 1.55; }
.list-placeholder { color: var(--muted); }
.violation-card, .fixup-card { border: 1px solid var(--line); border-radius: 18px; background: #fff; padding: 14px; margin-bottom: 12px; }
.violation-card.is-error { border-color: rgba(212,54,54,.35); }
.meta { color: var(--muted); font-size: 13px; margin-top: 6px; }
.details-grid--wide article { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 18px; align-items: start; }
.details-grid--wide .report-card__head { grid-column: 1 / -1; margin-bottom: 0; }
.tabs { position: sticky; top: 16px; display: flex; flex-direction: column; gap: 10px; max-height: calc(100vh - 32px); overflow: auto; padding: 12px; border: 1px solid var(--line); border-radius: 20px; background: rgba(255,255,255,.92); box-shadow: 0 14px 34px rgba(20,32,51,.10); backdrop-filter: blur(8px); }
.tab-button { width: 100%; border: 1px solid var(--line); border-radius: 14px; padding: 10px 12px; background: #fff; cursor: pointer; font-weight: 800; text-align: left; }
.tab-button.has-errors { border-color: rgba(212,54,54,.35); }
.tab-button.is-passed { border-color: rgba(20,133,90,.35); }
.tab-button.is-active { background: var(--primary); border-color: var(--primary); color: #fff; }
.image-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; }
.image-grid--large { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.image-tile { border: 1px solid var(--line); border-radius: 16px; padding: 10px; background: #fff; }
.image-tile img, .preview-frame img { width: 100%; max-width: 100%; display: block; border-radius: 12px; }
.zoom-wrap { position: relative; overflow: visible; border-radius: 12px; cursor: zoom-in; }
.zoom-lens { position: absolute; width: 270px; height: 270px; border: 3px solid #fff; border-radius: 50%; box-shadow: 0 12px 32px rgba(20,32,51,.32); background-repeat: no-repeat; pointer-events: none; transform: translate(-50%, -50%); display: none; z-index: 2; }
.zoom-wrap.is-zooming .zoom-lens { display: block; }
.preview-frame { min-height: 360px; border: 1px dashed #cbd8ea; border-radius: 18px; padding: 10px; background: repeating-linear-gradient(45deg, #fff, #fff 10px, #f5f8fc 10px, #f5f8fc 20px); overflow: auto; display: grid; place-items: center; }
.preview-frame canvas { max-width: 100%; display: block; border-radius: 12px; }
.toggle-list { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 14px; color: var(--muted); }
.toggle { display: inline-flex; align-items: center; gap: 8px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: var(--ink); }
.fixups-list { display: grid; gap: 14px; }
.candidate { display: grid; grid-template-columns: auto minmax(260px, .85fr) minmax(420px, 1.35fr); gap: 16px; align-items: start; padding: 16px; border: 1px solid var(--line); border-radius: 16px; margin-top: 12px; }
.candidate-preview img { width: 100%; min-height: 260px; object-fit: contain; background: #f8fbff; border-radius: 12px; border: 1px solid var(--line); }
.warning { color: var(--warning); font-weight: 800; }
.notice { border: 1px solid #ffd79a; background: #fff8eb; color: #7a4a00; padding: 12px 14px; border-radius: 14px; margin-bottom: 16px; }
.empty-state { border: 1px dashed #cbd8ea; background: #f8fbff; color: var(--muted); border-radius: 16px; padding: 18px; text-align: center; }
.button.is-loading::before { content: ""; display: inline-block; width: 12px; height: 12px; border: 2px solid rgba(255,255,255,.5); border-top-color: #fff; border-radius: 50%; margin-right: 8px; vertical-align: -2px; animation: spin .8s linear infinite; }
.compare-layout { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 20px; align-items: start; }
.compare-settings { position: sticky; top: 16px; border: 1px solid var(--line); border-radius: 22px; padding: 18px; background: #fbfdff; }
.compare-settings .toggle { width: 100%; margin-bottom: 10px; }
.compare-view { display: grid; gap: 20px; }
.compare-view--horizontal { grid-template-columns: 1fr; }
.compare-view--vertical { grid-template-columns: 1fr 1fr; }
.compare-view--slider .compare-pane { display: none; }
.slider-compare { position: relative; border: 1px solid var(--line); border-radius: 22px; overflow: hidden; background: #fbfdff; min-height: 520px; cursor: ew-resize; }
.slider-compare img { display: block; width: 100%; user-select: none; pointer-events: none; }
.slider-after-wrap { position: absolute; inset: 0; width: 100%; overflow: hidden; -webkit-mask-image: linear-gradient(90deg, #000 0%, #000 47%, transparent 53%, transparent 100%); mask-image: linear-gradient(90deg, #000 0%, #000 47%, transparent 53%, transparent 100%); }
.slider-after-wrap img { max-width: none; height: auto; }
.slider-line { position: absolute; top: 0; bottom: 0; left: 50%; width: 3px; background: var(--primary); box-shadow: 0 0 0 9999px rgba(47,109,246,.06); }
.panel--download { display: flex; justify-content: space-between; align-items: center; gap: 24px; }
.drawer { position: fixed; inset: 0; background: rgba(10,18,32,.32); z-index: 20; opacity: 0; pointer-events: none; transition: .18s ease; }
.drawer.is-open { opacity: 1; pointer-events: auto; }
.drawer__panel { margin-left: auto; width: min(560px, 92vw); height: 100%; background: #fff; padding: 28px; overflow: auto; box-shadow: -20px 0 50px rgba(20,32,51,.20); }
.drawer__close { position: sticky; top: 0; z-index: 3; display: block; margin-left: auto; border: 1px solid var(--line); background: #fff; border-radius: 12px; padding: 8px 12px; cursor: pointer; font-weight: 800; box-shadow: 0 8px 18px rgba(20,32,51,.08); }
.modal { width: min(860px, 92vw); max-height: 88vh; overflow: auto; border: 0; border-radius: 24px; padding: 26px; box-shadow: var(--shadow); }
.modal form[method="dialog"] { position: sticky; top: -26px; z-index: 3; min-height: 42px; margin: -26px -26px 14px; padding: 14px 26px 8px; background: linear-gradient(#fff 75%, rgba(255,255,255,0)); }
.modal::backdrop { background: rgba(10,18,32,.42); }
.modal--image { width: min(1180px, 96vw); }
.modal--image img { width: 100%; max-height: 82vh; object-fit: contain; border-radius: 16px; }
.toast { position: fixed; right: 22px; bottom: 22px; max-width: 420px; padding: 14px 16px; border-radius: 16px; background: #152033; color: #fff; box-shadow: var(--shadow); z-index: 10; }
.toast.is-error { background: var(--danger); }
.toast.is-success { background: var(--success); }

@media (max-width: 980px) {
  .settings-panel { position: static; }
  .hero__content, .report-grid, .details-grid, .viewer-grid, .compare-grid, .compare-layout, .compare-view--vertical, .panel--analysis { grid-template-columns: 1fr; }
  .details-grid--wide article { grid-template-columns: 1fr; }
  .details-grid--wide .report-card__head { grid-column: auto; }
  .tabs { position: static; flex-direction: row; max-height: none; }
  .step-grid { grid-template-columns: repeat(2, 1fr); margin-top: 24px; }
  .topbar { align-items: flex-start; flex-direction: column; margin-bottom: 32px; }
}
@media (max-width: 640px) {
  .topbar__links { display: none; }
  .step-grid { grid-template-columns: 1fr; }
  .panel__header, .panel--download { align-items: flex-start; flex-direction: column; }
  .candidate { grid-template-columns: 1fr; }
  .candidate-preview img { min-height: 180px; }
}