:root {
  --bg: #0b0c0f;
  --panel: #14161a;
  --panel-2: #1a1d22;
  --line: #30343b;
  --line-soft: #25282e;
  --text: #f4f4f2;
  --muted: #a5a8ae;
  --yellow: #ffd400;
  --yellow-soft: rgba(255, 212, 0, .14);
  --green: #52d994;
  --red: #ff7168;
  --blue: #8bbcff;
  --radius: 6px;
  color-scheme: dark;
  font-family: "Segoe UI", Inter, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

* { box-sizing: border-box; }
html { min-width: 320px; scroll-behavior: smooth; }
body { margin: 0; min-height: 100vh; background: radial-gradient(circle at 82% 0%, #202229 0, var(--bg) 31rem); color: var(--text); }
button, input, select { font: inherit; }
button, select, input { color: inherit; }
a { color: inherit; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 100; background: var(--yellow); color: #000; padding: .75rem 1rem; font-weight: 800; }
.skip-link:focus { top: 1rem; }

.site-header { position: sticky; top: 0; z-index: 50; background: rgba(5, 6, 8, .94); border-bottom: 1px solid #2a2c31; backdrop-filter: blur(16px); }
.header-inner { max-width: 1560px; min-height: 60px; margin: auto; padding: 0 2rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { display: flex; align-items: center; gap: .72rem; text-decoration: none; }
.flag { display: inline-grid; grid-template-columns: repeat(3, 7px); width: 21px; height: 15px; box-shadow: 0 0 0 1px rgba(255,255,255,.22); }
.flag i:nth-child(1) { background: #169b62; }
.flag i:nth-child(2) { background: #fff; }
.flag i:nth-child(3) { background: #ce2b37; }
.brand-name { color: var(--yellow); font-size: 1.35rem; font-weight: 900; letter-spacing: -.04em; font-style: italic; }
.brand-tool { padding-left: .75rem; border-left: 1px solid #494c53; font-size: .76rem; font-weight: 800; letter-spacing: .17em; }
.back-link { color: var(--muted); font-size: .76rem; font-weight: 800; letter-spacing: .12em; text-decoration: none; }
.back-link:hover, .back-link:focus-visible { color: var(--yellow); }

.page-shell { max-width: 1560px; margin: 0 auto; padding: 1.55rem 2rem 3.5rem; }
.intro { display: grid; grid-template-columns: minmax(0, 1fr) minmax(280px, 500px); align-items: end; gap: 3rem; margin-bottom: 1.45rem; }
.eyebrow { margin: 0 0 .55rem; color: var(--yellow); font-size: .73rem; font-weight: 900; letter-spacing: .18em; }
.intro h1 { margin: 0; max-width: 760px; font-size: clamp(2.15rem, 3vw, 3.75rem); line-height: .95; letter-spacing: -.05em; }
.intro h1 span { color: var(--yellow); }
.intro-copy { margin: 0; padding-bottom: .2rem; color: #c9cbd0; font-size: .96rem; line-height: 1.52; }

.workspace { display: grid; grid-template-columns: minmax(390px, 520px) minmax(0, 1fr); gap: 1rem; align-items: start; }
.control-panel, .result-panel { border: 1px solid var(--line); background: rgba(20, 22, 26, .96); box-shadow: 0 18px 70px rgba(0,0,0,.22); }
.control-panel { border-top: 4px solid var(--yellow); }
.control-section { padding: 1.45rem; border-bottom: 1px solid var(--line-soft); }
.control-section:last-child { border-bottom: 0; }
.section-heading { display: flex; gap: .85rem; align-items: flex-start; margin-bottom: 1.15rem; }
.step-number { display: grid; place-items: center; flex: 0 0 2.15rem; height: 2.15rem; border: 1px solid #4b4f57; color: var(--yellow); font-size: .72rem; font-weight: 900; }
.section-heading h2 { margin: 0; font-size: 1rem; line-height: 1.25; }
.section-heading p { margin: .28rem 0 0; color: var(--muted); font-size: .82rem; line-height: 1.4; }

.scenario-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: .55rem; }
.scenario-button { min-height: 64px; padding: .7rem .8rem; border: 1px solid #393d44; border-radius: var(--radius); background: #181a1f; text-align: left; cursor: pointer; transition: border-color .18s, background .18s, transform .18s; }
.scenario-button:last-child { grid-column: 1 / -1; }
.scenario-button:hover { border-color: #666b74; transform: translateY(-1px); }
.scenario-button:focus-visible { outline: 2px solid var(--yellow); outline-offset: 2px; }
.scenario-button.is-active { border-color: var(--yellow); background: var(--yellow-soft); }
.scenario-button span { display: block; font-weight: 800; }
.scenario-button small { display: block; margin-top: .2rem; color: var(--muted); font-size: .73rem; }

.guidance-fieldset { margin: 1.15rem 0 0; padding: 1rem; border: 1px solid #41454d; background: #101216; }
.guidance-fieldset legend { padding: 0 .35rem; color: var(--yellow); font-size: .78rem; font-weight: 900; letter-spacing: .04em; }
.guidance-fieldset > p { margin: -.15rem 0 .75rem; color: var(--muted); font-size: .72rem; line-height: 1.4; }
.guidance-options { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: .5rem; }
.guidance-button { min-height: 62px; padding: .65rem .7rem; border: 1px solid #383c43; border-radius: var(--radius); background: #181a1f; text-align: left; cursor: pointer; }
.guidance-button:hover, .guidance-button:focus-visible { border-color: #717680; outline: 0; }
.guidance-button.is-active { border-color: var(--yellow); background: var(--yellow-soft); }
.guidance-button strong, .guidance-button small { display: block; }
.guidance-button strong { font-size: .76rem; line-height: 1.25; }
.guidance-button small { margin-top: .24rem; color: var(--muted); font-size: .66rem; line-height: 1.3; }

.field-label, .criterion-fieldset legend { display: block; margin-bottom: .48rem; color: #c8cad0; font-size: .79rem; font-weight: 750; }
.select-control { width: 100%; min-height: 46px; margin-bottom: 1rem; padding: 0 .8rem; border: 1px solid #41454d; border-radius: var(--radius); background: #0f1115; }
.select-control:focus, input:focus-visible { outline: 2px solid var(--yellow); outline-offset: 2px; }
.dual-control { display: grid; grid-template-columns: 1fr 1fr; align-items: end; gap: 1rem; margin-top: .25rem; }
.value-box { display: flex; align-items: center; width: fit-content; min-height: 42px; border: 1px solid #41454d; border-radius: var(--radius); background: #0f1115; overflow: hidden; }
.value-box input { width: 78px; min-height: 40px; padding: 0 .25rem 0 .7rem; border: 0; background: transparent; font-weight: 800; }
.value-box span { align-self: stretch; display: grid; place-items: center; min-width: 42px; padding: 0 .55rem; border-left: 1px solid #353941; color: var(--muted); font-size: .75rem; }
.large-output { display: flex; align-items: center; min-height: 42px; color: var(--yellow); font-size: 1.35rem; font-weight: 900; }
.range-control { width: 100%; margin: .8rem 0 .55rem; accent-color: #92969e; cursor: pointer; }
.range-yellow { accent-color: var(--yellow); }
.quick-values { display: flex; gap: .35rem; flex-wrap: wrap; margin-bottom: .85rem; }
.quick-values button { min-width: 40px; padding: .35rem .5rem; border: 1px solid #383c43; border-radius: 4px; background: #111318; color: #bfc2c8; font-size: .72rem; cursor: pointer; }
.quick-values button:hover, .quick-values button:focus-visible, .quick-values button.is-active { border-color: var(--yellow); color: var(--yellow); outline: 0; }
.aperture-scale { display: flex; justify-content: space-between; color: #737781; font-size: .68rem; }
.distance-row { display: flex; align-items: end; justify-content: space-between; gap: 1rem; }
.distance-row .field-label { margin-bottom: .65rem; }

.criterion-fieldset { margin: 1.3rem 0 0; padding: 0; border: 0; }
.criterion-fieldset legend { margin-bottom: .7rem; }
.criterion-card { display: flex; align-items: flex-start; gap: .65rem; padding: .72rem .8rem; margin-bottom: .5rem; border: 1px solid #383c43; border-radius: var(--radius); background: #111318; cursor: pointer; }
.criterion-card:has(input:checked) { border-color: var(--yellow); background: var(--yellow-soft); }
.criterion-card input { margin-top: .18rem; accent-color: var(--yellow); }
.criterion-card strong { display: block; font-size: .82rem; }
.criterion-card small { display: block; margin-top: .18rem; color: var(--muted); font-size: .72rem; line-height: 1.35; }

.advanced-panel, .method-panel { border-top: 1px solid var(--line-soft); }
.advanced-panel { margin: 1.15rem -1.45rem -1.45rem; }
.advanced-panel summary, .method-panel summary { padding: 1rem 1.45rem; color: #bbbfc6; font-size: .8rem; font-weight: 800; cursor: pointer; }
.advanced-panel summary:hover, .method-panel summary:hover { color: var(--yellow); }
.advanced-content { padding: 0 1.45rem 1.25rem; }
.advanced-content p { color: var(--muted); font-size: .75rem; line-height: 1.5; }
.custom-check { display: flex; gap: .55rem; align-items: center; margin-bottom: .9rem; color: #d8dade; font-size: .8rem; }
.custom-check input { accent-color: var(--yellow); }

.result-panel { position: sticky; top: 76px; overflow: hidden; }
.result-panel > :not(.depth-figure, .method-panel) { margin-left: 2rem; margin-right: 2rem; }
.result-topline { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-top: 1.45rem; }
.status-badge { display: inline-flex; align-items: center; min-height: 26px; padding: 0 .65rem; border: 1px solid rgba(82,217,148,.55); background: rgba(82,217,148,.12); color: var(--green); font-size: .7rem; font-weight: 900; letter-spacing: .13em; }
.status-badge.is-warning { border-color: rgba(255,113,104,.6); background: rgba(255,113,104,.12); color: var(--red); }
.status-badge.is-neutral { border-color: rgba(139,188,255,.55); background: rgba(139,188,255,.1); color: var(--blue); }
.criterion-note { color: var(--muted); font-size: .75rem; }
.result-panel > h2 { max-width: 850px; margin-top: 1rem; margin-bottom: .5rem; font-size: clamp(1.65rem, 2.15vw, 2.6rem); line-height: 1.04; letter-spacing: -.04em; }
.result-summary { max-width: 850px; margin-top: 0; margin-bottom: 1.25rem; color: #c4c7cd; font-size: .92rem; line-height: 1.52; }

.metric-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); border: 1px solid var(--line); }
.metric-grid article { min-height: 101px; padding: .85rem 1rem; border-right: 1px solid var(--line); background: #101216; }
.metric-grid article:last-child { border-right: 0; }
.metric-grid span { display: block; color: #8d9199; font-size: .66rem; font-weight: 850; letter-spacing: .12em; }
.metric-grid strong { display: block; margin: .38rem 0 .24rem; color: var(--yellow); font-size: clamp(1.35rem, 1.9vw, 1.9rem); line-height: 1; }
.metric-grid small { color: #8d9199; font-size: .7rem; }
.numbers-panel { margin-top: 1.4rem; margin-bottom: 1.4rem; border: 1px solid var(--line); background: #101216; }
.numbers-panel summary { padding: .9rem 1rem; color: #c8cad0; font-size: .78rem; font-weight: 850; cursor: pointer; }
.numbers-panel summary:hover { color: var(--yellow); }
.numbers-panel .metric-grid { border-width: 1px 0 0; }

.depth-figure { margin: 1.25rem 0 0; padding: 1.15rem 2rem 1.3rem; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: linear-gradient(180deg, #101216, #15171b); }
.depth-figure figcaption { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; margin-bottom: .8rem; font-size: .82rem; font-weight: 850; }
.depth-figure figcaption small { color: var(--muted); font-size: .7rem; font-weight: 500; }
.preview-viewport { --preview-near-blur: 0px; --preview-middle-blur: 0px; --preview-far-blur: 2px; --preview-zoom: 1; --preview-origin-x: 50%; --preview-origin-y: 50%; --focus-label-x: 62%; --focus-label-y: 48%; position: relative; overflow: hidden; aspect-ratio: 16 / 5.65; border: 1px solid #3a3e45; background: #08090b; isolation: isolate; }
.preview-layer { position: absolute; inset: 0; overflow: hidden; }
.preview-layer img { position: absolute; inset: -2%; width: 104%; height: 104%; max-width: none; object-fit: cover; transform: scale(var(--preview-zoom)); transform-origin: var(--preview-origin-x) var(--preview-origin-y); transition: filter .18s ease-out, transform .24s ease-out; }
.preview-far { z-index: 1; }
.preview-far img { filter: blur(var(--preview-far-blur)) saturate(.92) brightness(.86); }
.preview-middle { z-index: 2; -webkit-mask-image: radial-gradient(ellipse 36% 52% at 50% 50%, #000 28%, rgba(0,0,0,.94) 58%, transparent 100%); mask-image: radial-gradient(ellipse 36% 52% at 50% 50%, #000 28%, rgba(0,0,0,.94) 58%, transparent 100%); }
.preview-middle img { filter: blur(var(--preview-middle-blur)) saturate(.94) brightness(.87); }
.preview-near { z-index: 3; -webkit-mask-image: linear-gradient(to bottom, transparent 55%, rgba(0,0,0,.9) 76%, #000 100%); mask-image: linear-gradient(to bottom, transparent 55%, rgba(0,0,0,.9) 76%, #000 100%); }
.preview-near img { filter: blur(var(--preview-near-blur)) saturate(.93) brightness(.86); }
.preview-viewport[data-scene="landscape"] { --preview-origin-x: 52%; --preview-origin-y: 46%; --focus-label-x: 63%; --focus-label-y: 47%; }
.preview-viewport[data-scene="landscape"] .preview-middle { -webkit-mask-image: radial-gradient(ellipse 31% 40% at 52% 44%, #000 26%, rgba(0,0,0,.94) 56%, transparent 100%); mask-image: radial-gradient(ellipse 31% 40% at 52% 44%, #000 26%, rgba(0,0,0,.94) 56%, transparent 100%); }
.preview-viewport[data-scene="street"] { --preview-origin-x: 50%; --preview-origin-y: 51%; --focus-label-x: 62%; --focus-label-y: 52%; }
.preview-viewport[data-scene="street"] .preview-middle { -webkit-mask-image: radial-gradient(ellipse 29% 52% at 50% 53%, #000 24%, rgba(0,0,0,.96) 57%, transparent 100%); mask-image: radial-gradient(ellipse 29% 52% at 50% 53%, #000 24%, rgba(0,0,0,.96) 57%, transparent 100%); }
.preview-viewport[data-scene="interior"] { --preview-origin-x: 49%; --preview-origin-y: 54%; --focus-label-x: 61%; --focus-label-y: 53%; }
.preview-viewport[data-scene="interior"] .preview-middle { -webkit-mask-image: radial-gradient(ellipse 29% 45% at 49% 54%, #000 28%, rgba(0,0,0,.94) 58%, transparent 100%); mask-image: radial-gradient(ellipse 29% 45% at 49% 54%, #000 28%, rgba(0,0,0,.94) 58%, transparent 100%); }
.preview-viewport[data-scene="night"] { --preview-origin-x: 49%; --preview-origin-y: 53%; --focus-label-x: 61%; --focus-label-y: 55%; }
.preview-viewport[data-scene="night"] .preview-middle { -webkit-mask-image: radial-gradient(ellipse 23% 39% at 49% 53%, #000 26%, rgba(0,0,0,.96) 55%, transparent 100%); mask-image: radial-gradient(ellipse 23% 39% at 49% 53%, #000 26%, rgba(0,0,0,.96) 55%, transparent 100%); }
.preview-viewport[data-scene="portrait"] { --preview-origin-x: 50%; --preview-origin-y: 42%; --focus-label-x: 68%; --focus-label-y: 37%; }
.preview-viewport[data-scene="portrait"] .preview-middle { -webkit-mask-image: radial-gradient(ellipse 29% 62% at 50% 48%, #000 34%, rgba(0,0,0,.98) 63%, transparent 100%); mask-image: radial-gradient(ellipse 29% 62% at 50% 48%, #000 34%, rgba(0,0,0,.98) 63%, transparent 100%); }
.preview-shade { position: absolute; inset: 0; z-index: 4; pointer-events: none; background: linear-gradient(180deg, rgba(0,0,0,.15), transparent 45%, rgba(0,0,0,.18)), linear-gradient(90deg, rgba(0,0,0,.2), transparent 35%, transparent 70%, rgba(0,0,0,.12)); }
.preview-label { position: absolute; z-index: 5; padding: .32rem .46rem; border: 1px solid rgba(255,255,255,.34); background: rgba(6,7,9,.76); color: #fff; font-size: .59rem; font-weight: 900; letter-spacing: .1em; box-shadow: 0 3px 16px rgba(0,0,0,.35); }
.preview-label::before { content: ""; display: inline-block; width: 6px; height: 6px; margin-right: .35rem; border-radius: 50%; background: var(--yellow); }
.preview-label-near { left: 2.5%; bottom: 8%; }
.preview-label-focus { left: var(--focus-label-x); top: var(--focus-label-y); transform: translate(-50%, -50%); border-color: var(--yellow); }
.preview-label-far { right: 2.5%; top: 8%; }
.preview-frame-label { position: absolute; left: 2.5%; top: 7%; z-index: 5; padding: .3rem .45rem; background: rgba(6,7,9,.7); color: #dfe1e5; font-size: .58rem; font-weight: 850; letter-spacing: .09em; }
.preview-note { margin: .55rem 0 .9rem; color: #81858d; font-size: .67rem; line-height: 1.4; }
.depth-figure .depth-stage { margin-top: .1rem; }
.depth-stage { --zone-start: 25%; --focus: 48%; --target: 27%; position: relative; }
.depth-scale { display: flex; justify-content: space-between; margin-bottom: .65rem; color: #696d76; font-size: .62rem; font-weight: 850; letter-spacing: .12em; }
.depth-line { position: relative; height: 94px; border-top: 2px solid #484c54; }
.soft-zone, .sharp-zone { position: absolute; top: -2px; height: 7px; }
.soft-zone { left: 0; width: var(--zone-start); background: #545861; }
.sharp-zone { left: var(--zone-start); right: 0; background: linear-gradient(90deg, var(--yellow), rgba(255,212,0,.35)); box-shadow: 0 0 22px rgba(255,212,0,.2); }
.depth-stage.is-portrait .soft-zone { left: 0; width: 100%; background: #545861; }
.depth-stage.is-portrait .sharp-zone { left: var(--zone-start); right: auto; width: calc(var(--zone-end) - var(--zone-start)); background: linear-gradient(90deg, rgba(255,212,0,.3), var(--yellow), rgba(255,212,0,.3)); }
.depth-stage.is-portrait .near-marker, .depth-stage.is-portrait .target-marker { display: none; }
.depth-marker { position: absolute; top: -8px; display: flex; flex-direction: column; align-items: center; width: 108px; margin-left: -54px; text-align: center; }
.depth-marker b { width: 14px; height: 14px; border: 3px solid #111318; border-radius: 50%; background: #888d96; box-shadow: 0 0 0 1px #7d828b; }
.depth-marker span { margin-top: .55rem; color: #92969e; font-size: .66rem; line-height: 1.35; }
.depth-marker strong { color: #e5e6e8; font-size: .76rem; }
.near-marker { left: var(--zone-start); }
.near-marker b { background: var(--yellow); box-shadow: 0 0 0 1px var(--yellow); }
.target-marker { left: var(--target); top: 42px; }
.target-marker b { background: var(--green); box-shadow: 0 0 0 1px var(--green); }
.target-marker.is-out b { background: var(--red); box-shadow: 0 0 0 1px var(--red); }
.focus-marker { left: var(--focus); }
.focus-marker b { width: 18px; height: 18px; margin-top: -2px; border-color: var(--yellow); background: #111318; box-shadow: 0 0 0 1px var(--yellow), 0 0 18px rgba(255,212,0,.35); }
.depth-caption { margin: .25rem 0 0; color: #a9acb2; font-size: .74rem; line-height: 1.45; }

.advice-section { padding-top: .35rem; padding-bottom: 1.4rem; }
.advice-section h3, .reason-box h3 { margin: 0 0 1rem; font-size: 1.15rem; }
.advice-list { display: grid; gap: .6rem; }
.advice-card { display: grid; grid-template-columns: 2.35rem 1fr; gap: .85rem; padding: .9rem; border: 1px solid #353940; background: #111318; }
.advice-card .advice-index { display: grid; place-items: center; width: 2.35rem; height: 2.35rem; border: 1px solid #4c5058; color: var(--yellow); font-size: .72rem; font-weight: 900; }
.advice-card strong { display: block; margin-bottom: .2rem; font-size: .87rem; }
.advice-card p { margin: 0; color: #aaadb4; font-size: .78rem; line-height: 1.45; }
.reason-box { margin-top: 1.5rem; margin-bottom: 1.8rem; padding: 1.15rem 1.25rem; border-left: 3px solid var(--yellow); background: var(--yellow-soft); }
.reason-box p { margin: 0; color: #d2d3d6; font-size: .88rem; line-height: 1.58; }
.method-panel { margin-top: 0; }
.method-panel p { max-width: 850px; margin: 0; padding: 0 2rem 1.5rem; color: var(--muted); font-size: .82rem; line-height: 1.6; }

.site-footer { max-width: 1560px; margin: 0 auto; padding: 0 2rem 2.5rem; display: flex; justify-content: space-between; gap: 2rem; color: #858991; font-size: .76rem; }
.site-footer div:first-child { display: grid; gap: .25rem; }
.site-footer strong { color: #c9cbd0; }
.footer-meta { display: flex; gap: 1.2rem; align-items: end; }
.footer-meta a { color: var(--yellow); font-weight: 800; text-decoration: none; }

@media (max-width: 1080px) {
  .intro { grid-template-columns: 1fr; gap: 1rem; }
  .intro-copy { max-width: 720px; }
  .workspace { grid-template-columns: 1fr; }
  .result-panel { position: static; }
}

@media (max-width: 680px) {
  .header-inner { min-height: 58px; padding: 0 1rem; }
  .brand-tool { display: none; }
  .back-link { font-size: .65rem; }
  .page-shell { padding: 1.45rem .8rem 3rem; }
  .intro { margin-bottom: 1.35rem; }
  .intro h1 { font-size: clamp(2rem, 10.5vw, 3.1rem); }
  .intro-copy { font-size: .94rem; }
  .control-section { padding: 1.1rem; }
  .scenario-grid { grid-template-columns: 1fr; }
  .scenario-button:last-child { grid-column: auto; }
  .guidance-options { grid-template-columns: 1fr; }
  .dual-control { grid-template-columns: 1fr 1fr; }
  .distance-row { align-items: flex-start; flex-direction: column; gap: .2rem; }
  .result-panel > :not(.depth-figure, .method-panel) { margin-left: 1rem; margin-right: 1rem; }
  .result-topline { align-items: flex-start; flex-direction: column; }
  .metric-grid { grid-template-columns: 1fr; }
  .metric-grid article { min-height: 92px; border-right: 0; border-bottom: 1px solid var(--line); }
  .metric-grid article:last-child { border-bottom: 0; }
  .depth-figure { padding-left: 1rem; padding-right: 1rem; overflow: hidden; }
  .depth-figure figcaption { align-items: flex-start; flex-direction: column; gap: .2rem; }
  .preview-viewport { aspect-ratio: 4 / 2.45; }
  .preview-label { font-size: .52rem; }
  .preview-frame-label { font-size: .5rem; }
  .depth-marker { width: 80px; margin-left: -40px; }
  .near-marker span { transform: translateX(20px); }
  .focus-marker span { transform: translateX(-8px); }
  .site-footer { padding: 0 1rem 2rem; flex-direction: column; gap: 1rem; }
  .footer-meta { align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}