:root {
  --navy: #0b1f36;
  --navy-soft: #14324f;
  --blue: #1f5a82;
  --orange: #ef6a32;
  --orange-dark: #d9511e;
  --ink: #132334;
  --muted: #657887;
  --line: #dbe3e9;
  --soft: #f3f6f8;
  --white: #ffffff;
  --green: #1b7a61;
  --shadow: 0 24px 70px rgba(10, 31, 51, 0.12);
  --radius: 18px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: #eef2f5; color: var(--ink); font-family: Inter, ui-sans-serif, system-ui, Arial, sans-serif; font-size: 16px; line-height: 1.5; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }

.topbar { height: 78px; padding: 0 clamp(24px, 5vw, 72px); display: flex; align-items: center; justify-content: space-between; background: var(--white); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 30; }
.brand { display: flex; align-items: center; gap: 13px; border: 0; background: transparent; padding: 0; color: var(--navy); text-align: left; }
.brand-logo { display: block; width: 50px; height: 40px; object-fit: contain; flex: 0 0 auto; }
.brand-copy { display: flex; flex-direction: column; line-height: 1; }
.brand-copy strong { letter-spacing: .04em; font-size: 15px; }
.brand-copy small { margin-top: 6px; color: var(--muted); font-size: 11px; letter-spacing: .04em; }
.header-actions { display: flex; align-items: center; gap: 24px; }
.engineer-status { color: var(--muted); font-size: 14px; display: flex; align-items: center; gap: 9px; }
.engineer-status i { width: 8px; height: 8px; background: #2cab7f; border-radius: 50%; box-shadow: 0 0 0 5px #e5f5ef; }
.text-button { border: 0; background: transparent; color: var(--navy); font-weight: 700; padding: 9px 2px; border-bottom: 2px solid var(--orange); }
.text-button.light { color: white; border-color: rgba(255,255,255,.7); }

.screen { display: none; min-height: calc(100vh - 78px); }
.screen.active { display: flex; }
.home-screen { max-width: 1480px; margin: 0 auto; padding: clamp(48px, 7vw, 100px) clamp(24px, 5vw, 72px); align-items: center; gap: clamp(48px, 7vw, 108px); }
.home-copy { flex: 1; max-width: 650px; }
.eyebrow { display: flex; align-items: center; gap: 16px; color: var(--blue); font-weight: 750; letter-spacing: .06em; text-transform: uppercase; font-size: 12px; }
.eyebrow span:first-child { color: var(--orange-dark); }
.eyebrow span + span:before { content: ""; width: 24px; height: 1px; background: #aab7c0; display: inline-block; vertical-align: middle; margin-right: 16px; }
h1 { font-family: Georgia, "Times New Roman", serif; font-size: clamp(48px, 5.4vw, 82px); line-height: .98; letter-spacing: -.045em; margin: 24px 0 28px; color: var(--navy); font-weight: 500; }
.lead { max-width: 590px; font-size: 19px; line-height: 1.7; color: var(--muted); margin: 0; }
.home-actions { margin-top: 38px; display: flex; flex-wrap: wrap; gap: 12px; }
.primary-button, .secondary-button, .back-button { border: 0; min-height: 48px; padding: 0 22px; border-radius: 8px; font-weight: 750; display: inline-flex; justify-content: center; align-items: center; gap: 16px; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.primary-button { background: var(--orange); color: white; box-shadow: 0 8px 18px rgba(239,106,50,.22); }
.primary-button:hover { background: var(--orange-dark); transform: translateY(-1px); box-shadow: 0 12px 24px rgba(239,106,50,.28); }
.primary-button span { font-size: 19px; }
.secondary-button { color: var(--navy); background: white; border: 1px solid #bac7cf; }
.secondary-button:hover { border-color: var(--navy); transform: translateY(-1px); }
.large { min-height: 56px; padding: 0 26px; }
.trust-list { padding: 0; margin: 54px 0 0; list-style: none; display: flex; gap: 24px; flex-wrap: wrap; }
.trust-list li { color: #516574; font-size: 14px; font-weight: 650; }
.trust-list span { color: var(--orange); margin-right: 7px; font-size: 12px; }

.engineering-visual { flex: 0 1 660px; background: white; border-radius: 3px; box-shadow: var(--shadow); border: 1px solid #d4dee5; overflow: hidden; position: relative; }
.engineering-visual:before { content: ""; position: absolute; top: 0; left: 0; width: 86px; height: 4px; background: var(--orange); z-index: 2; }
.visual-head { padding: 20px 24px; display: flex; justify-content: space-between; font-size: 13px; font-weight: 750; border-bottom: 1px solid var(--line); letter-spacing: .04em; text-transform: uppercase; }
.live-pill { color: var(--green); font-size: 11px; background: #e8f4f0; border-radius: 99px; padding: 5px 9px; }
.engineering-visual svg { display: block; width: 100%; height: auto; }
.visual-data { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.visual-data div { padding: 17px 20px; border-right: 1px solid var(--line); display: flex; flex-direction: column; gap: 4px; }
.visual-data div:last-child { border-right: 0; }
.visual-data span { font-size: 12px; color: var(--muted); }
.visual-data strong { color: var(--navy); font-size: 17px; }
.visual-data .good { color: var(--green); }

.selector-screen { background: #edf2f5; }
.step-rail { width: 310px; flex: 0 0 310px; background: var(--navy); color: white; padding: 42px 28px 30px; display: flex; flex-direction: column; }
.rail-heading { border-bottom: 1px solid rgba(255,255,255,.13); padding: 0 5px 26px; }
.rail-heading span { display: block; font-family: Georgia, serif; font-size: 24px; }
.rail-heading strong { color: #9bb0c1; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; margin-top: 9px; display: block; }
.step-nav { padding: 28px 0; display: grid; gap: 8px; }
.step-nav-item { width: 100%; border: 0; background: transparent; color: #99adbc; text-align: left; display: flex; gap: 14px; align-items: center; padding: 13px 9px; border-radius: 10px; }
.step-nav-item > span { width: 32px; height: 32px; display: grid; place-items: center; border: 1px solid #476075; border-radius: 50%; font-weight: 700; font-size: 13px; flex: 0 0 32px; }
.step-nav-item div { display: flex; flex-direction: column; }
.step-nav-item strong { font-size: 14px; color: #cad5dd; }
.step-nav-item small { font-size: 12px; margin-top: 2px; }
.step-nav-item.current { background: rgba(255,255,255,.08); color: white; }
.step-nav-item.current > span { background: var(--orange); border-color: var(--orange); }
.step-nav-item.current strong { color: white; }
.step-nav-item.complete > span { border-color: #4fb992; color: #4fb992; }
.step-nav-item.complete > span { font-size: 0; }
.step-nav-item.complete > span:before { content: "✓"; font-size: 13px; }
.support-card { margin-top: auto; display: flex; gap: 13px; padding: 17px; border: 1px solid rgba(255,255,255,.13); border-radius: 12px; background: rgba(255,255,255,.04); }
.support-icon { width: 28px; height: 28px; border-radius: 50%; background: rgba(255,255,255,.1); display: grid; place-items: center; flex: 0 0 28px; font-weight: 700; }
.support-card strong { font-size: 13px; }
.support-card p { margin: 5px 0 0; font-size: 12px; color: #9fb0bd; line-height: 1.55; }
.step-workspace { flex: 1; min-width: 0; min-height: calc(100vh - 78px); display: flex; flex-direction: column; }
.step-panel { display: none; width: min(100%, 1040px); margin: 0 auto; padding: 56px clamp(30px, 5vw, 76px) 30px; flex: 1; }
.step-panel.active { display: block; animation: panelIn .35s ease both; }
@keyframes panelIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.step-heading { margin-bottom: 34px; max-width: 720px; }
.step-kicker { color: var(--orange-dark); text-transform: uppercase; font-size: 12px; letter-spacing: .11em; font-weight: 800; }
.step-heading h2, .inquiry-intro h2 { font-family: Georgia, serif; color: var(--navy); font-weight: 500; font-size: clamp(34px, 4vw, 48px); line-height: 1.08; letter-spacing: -.025em; margin: 10px 0 12px; }
.step-heading p { color: var(--muted); margin: 0; font-size: 17px; }
.application-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.choice-card { min-height: 180px; background: white; border: 1px solid var(--line); border-radius: 14px; padding: 22px; text-align: left; display: flex; flex-direction: column; position: relative; color: var(--ink); transition: border .2s, box-shadow .2s, transform .2s; }
.choice-card:hover { transform: translateY(-2px); border-color: #aebdc8; }
.choice-card.selected { border: 2px solid var(--orange); padding: 21px; box-shadow: 0 10px 28px rgba(20,50,79,.09); }
.choice-icon { width: 42px; height: 42px; display: grid; place-items: center; background: #edf3f6; color: var(--navy); border-radius: 10px; margin-bottom: 22px; }
.choice-icon svg { width: 27px; height: 27px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.choice-card strong { font-size: 16px; color: var(--navy); }
.choice-card small { margin-top: 6px; color: var(--muted); font-size: 13px; line-height: 1.45; }
.choice-card > i, .environment-card > i { display: none; position: absolute; font-style: normal; color: white; background: var(--orange); border-radius: 50%; width: 23px; height: 23px; place-items: center; right: 14px; top: 14px; font-size: 12px; }
.choice-card.selected > i, .environment-card.selected > i { display: grid; }

.input-layout { display: grid; grid-template-columns: 1.1fr .9fr; gap: 20px; align-items: stretch; }
.input-stack { display: grid; gap: 12px; }
.field-card { padding: 19px 20px; background: white; border: 1px solid var(--line); border-radius: 12px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.field-card > span:first-child { display: flex; flex-direction: column; }
.field-card strong { color: var(--navy); }
.field-card small { font-size: 12px; margin-top: 4px; color: var(--muted); }
.input-with-unit { display: flex; align-items: center; border: 1px solid #b9c7d0; border-radius: 7px; overflow: hidden; background: #f8fafb; flex: 0 0 auto; }
.input-with-unit:focus-within { outline: 2px solid rgba(239,106,50,.24); border-color: var(--orange); }
.input-with-unit input { width: 86px; height: 44px; border: 0; outline: 0; background: white; padding: 0 12px; color: var(--navy); font-weight: 750; }
.input-with-unit b { padding: 0 11px; color: var(--muted); font-size: 13px; }
.diagram-card { background: white; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.diagram-label { display: flex; justify-content: space-between; padding: 17px 19px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.diagram-label strong { color: var(--navy); }
.diagram-card svg { width: 100%; height: auto; display: block; }

.motion-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.control-card { background: white; border: 1px solid var(--line); border-radius: 14px; padding: 24px; }
.control-card.full { grid-column: 1 / -1; }
.control-title { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; }
.control-title div { display: flex; flex-direction: column; }
.control-title strong { color: var(--navy); }
.control-title small { color: var(--muted); margin-top: 4px; }
.control-title output { color: var(--orange-dark); background: #fff0e9; padding: 7px 11px; border-radius: 7px; font-weight: 800; }
.range { width: 100%; margin: 38px 0 14px; accent-color: var(--orange); }
.range-labels { display: flex; justify-content: space-between; color: #8a9aa6; font-size: 11px; }
.segmented { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 25px; }
.segmented button { min-height: 64px; border: 1px solid var(--line); border-radius: 9px; background: #f8fafb; color: var(--muted); font-weight: 650; }
.segmented button span { color: var(--navy); margin-right: 7px; font-weight: 850; }
.segmented button.selected { border: 2px solid var(--orange); color: var(--navy); background: #fff8f4; }

.environment-list { display: grid; gap: 11px; }
.environment-card { position: relative; width: 100%; min-height: 88px; background: white; border: 1px solid var(--line); border-radius: 13px; padding: 15px 54px 15px 17px; display: grid; grid-template-columns: 50px 1fr auto; gap: 16px; align-items: center; text-align: left; color: var(--ink); }
.environment-card:hover { border-color: #aebdc8; }
.environment-card.selected { border: 2px solid var(--orange); padding: 14px 53px 14px 16px; box-shadow: 0 8px 24px rgba(20,50,79,.07); }
.environment-icon { width: 48px; height: 48px; display: grid; place-items: center; background: #edf3f6; border-radius: 10px; color: var(--navy); font-size: 22px; font-weight: 500; }
.environment-card div { display: flex; flex-direction: column; }
.environment-card strong { color: var(--navy); }
.environment-card small { color: var(--muted); font-size: 13px; margin-top: 3px; }
.environment-card b { color: var(--blue); font-size: 12px; background: #edf4f7; padding: 7px 10px; border-radius: 6px; }

.review-layout { display: grid; grid-template-columns: 1.3fr .7fr; gap: 18px; }
.review-list { background: white; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.review-row { display: flex; justify-content: space-between; gap: 30px; padding: 17px 20px; border-bottom: 1px solid var(--line); }
.review-row:last-child { border: 0; }
.review-row span { color: var(--muted); }
.review-row strong { color: var(--navy); text-align: right; }
.review-note { background: var(--navy); color: white; padding: 25px; border-radius: 14px; align-self: start; }
.review-note span { color: #f49a75; text-transform: uppercase; font-size: 11px; letter-spacing: .1em; font-weight: 800; }
.review-note p { color: #bfccd6; margin: 12px 0 0; font-size: 14px; line-height: 1.7; }

.step-footer { height: 82px; background: white; border-top: 1px solid var(--line); padding: 0 clamp(30px, 5vw, 76px); display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.back-button { background: transparent; color: var(--navy); padding-left: 0; }
.footer-hint { color: var(--muted); font-size: 12px; margin-left: auto; }
.mobile-progress { display: none; }

.result-screen { display: none; flex-direction: column; background: #edf2f5; }
.result-screen.active { display: flex; }
.result-banner { background: var(--navy); color: white; padding: 30px clamp(24px, 6vw, 92px); display: flex; align-items: center; justify-content: space-between; }
.result-banner > div { display: flex; align-items: center; gap: 17px; }
.result-check { width: 48px; height: 48px; display: grid; place-items: center; background: var(--green); border-radius: 50%; font-weight: 900; font-size: 22px; }
.result-banner div div > span { text-transform: uppercase; letter-spacing: .1em; font-size: 11px; color: #9fb1bf; font-weight: 800; }
.result-banner h2 { margin: 3px 0 0; font-family: Georgia, serif; font-weight: 500; font-size: 28px; }
.result-grid { width: min(1240px, calc(100% - 48px)); margin: 38px auto 70px; display: grid; grid-template-columns: 1fr 360px; gap: 20px; }
.result-product-card, .why-card, .input-summary { background: white; border: 1px solid var(--line); border-radius: 15px; }
.result-product-card { padding: 30px; }
.product-heading { display: flex; justify-content: space-between; gap: 20px; align-items: flex-start; }
.product-heading > div { display: flex; flex-direction: column; }
.product-heading span { color: var(--muted); font-size: 13px; }
.product-heading h3 { margin: 3px 0 0; font-family: Georgia, serif; font-weight: 500; color: var(--navy); font-size: 34px; }
.match-badge { color: var(--green) !important; background: #e9f5f1; font-weight: 800; padding: 7px 10px; border-radius: 99px; }
.product-illustration { margin: 30px 0 20px; background: #f3f6f8; border-radius: 10px; border: 1px solid #e1e8ed; overflow: hidden; }
.product-illustration svg { width: 100%; display: block; }
.spec-grid { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.spec-grid div { padding: 15px 16px; border-right: 1px solid var(--line); display: flex; flex-direction: column; }
.spec-grid div:last-child { border-right: 0; }
.spec-grid span { color: var(--muted); font-size: 12px; }
.spec-grid strong { color: var(--navy); font-size: 18px; margin-top: 3px; }
.result-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; position: relative; z-index: 3; }
.result-side { display: grid; gap: 16px; align-content: start; }
.why-card { padding: 24px; }
.why-card > span, .card-title > span { text-transform: uppercase; color: var(--orange-dark); letter-spacing: .1em; font-size: 11px; font-weight: 850; }
.why-card p { color: var(--muted); line-height: 1.65; }
.why-card ul { list-style: none; padding: 14px 0 0; margin: 14px 0 0; border-top: 1px solid var(--line); display: grid; gap: 10px; font-size: 13px; font-weight: 700; color: var(--navy); }
.why-card li { display: flex; gap: 8px; }
.why-card i { color: var(--green); font-style: normal; }
.input-summary { padding: 22px; }
.card-title { display: flex; justify-content: space-between; align-items: center; margin-bottom: 11px; }
.card-title button { border: 0; background: transparent; color: var(--blue); font-weight: 750; }
.summary-row { display: flex; justify-content: space-between; gap: 20px; padding: 9px 0; font-size: 13px; border-bottom: 1px solid #edf1f3; }
.summary-row:last-child { border: 0; }
.summary-row span { color: var(--muted); }
.summary-row strong { color: var(--navy); text-align: right; }
.disclaimer { font-size: 12px; color: var(--muted); line-height: 1.55; margin: 0 4px; }

.inquiry-screen { align-items: center; justify-content: center; padding: 48px 24px; background: linear-gradient(135deg, #dfe7ec, #f5f7f8); }
.inquiry-wrap { width: min(1100px, 100%); min-height: 650px; background: white; box-shadow: var(--shadow); border-radius: 18px; overflow: hidden; display: grid; grid-template-columns: .8fr 1.2fr; position: relative; }
.inquiry-wrap.is-success { grid-template-columns: 1fr; }
.close-inquiry { position: absolute; top: 17px; right: 19px; width: 38px; height: 38px; z-index: 2; border: 1px solid var(--line); background: white; color: var(--navy); border-radius: 50%; font-size: 25px; line-height: 1; }
.inquiry-intro { padding: 56px 42px; background: var(--navy); color: white; }
.inquiry-intro h2 { color: white; font-size: 41px; margin-top: 14px; }
.inquiry-intro > p { color: #b7c6d1; line-height: 1.75; }
.attached-spec { margin-top: 30px; padding: 17px 18px; border: 1px solid rgba(255,255,255,.16); border-left: 3px solid var(--orange); border-radius: 8px; display: flex; flex-direction: column; }
.attached-spec span { color: #9eb1bf; font-size: 11px; text-transform: uppercase; letter-spacing: .08em; }
.attached-spec strong { font-family: Georgia, serif; font-weight: 500; font-size: 24px; margin-top: 5px; }
.attached-spec small { color: #b7c6d1; margin-top: 4px; }
.inquiry-screen:not(.selector-mode) .attached-spec { display: none; }
.inquiry-intro ul { list-style: none; padding: 0; margin: 31px 0 0; display: grid; gap: 13px; color: #d9e2e8; font-size: 13px; }
.inquiry-intro li { display: flex; align-items: center; gap: 12px; }
.inquiry-intro li span { width: 25px; height: 25px; display: grid; place-items: center; background: rgba(255,255,255,.08); border-radius: 50%; font-size: 11px; color: #f5a17d; }
.inquiry-form { padding: 56px 52px 38px; display: grid; gap: 17px; align-content: start; }
.existing-spec-fields { display: none; gap: 14px; padding: 18px; background: var(--soft); border: 1px solid var(--line); border-radius: 10px; }
.inquiry-screen.existing-mode .existing-spec-fields { display: grid; }
.spec-section-title { display: flex; flex-direction: column; gap: 4px; padding-bottom: 4px; }
.spec-section-title strong { color: var(--navy); font-size: 14px; }
.spec-section-title small, .file-field small { color: var(--muted); font-size: 11px; font-weight: 500; line-height: 1.5; }
.file-field input[type="file"] { padding: 9px; background: white; }
.file-field input[type="file"]::file-selector-button { border: 0; border-radius: 6px; padding: 8px 11px; margin-right: 10px; background: var(--navy); color: white; cursor: pointer; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.inquiry-form label:not(.consent) { display: flex; flex-direction: column; gap: 7px; color: var(--navy); font-size: 13px; font-weight: 750; }
.inquiry-form input:not([type="checkbox"]), .inquiry-form select, .inquiry-form textarea { width: 100%; border: 1px solid #bcc9d1; border-radius: 8px; background: #fbfcfd; padding: 12px 13px; outline: 0; color: var(--ink); }
.inquiry-form input:not([type="checkbox"]):focus, .inquiry-form select:focus, .inquiry-form textarea:focus { border-color: var(--orange); box-shadow: 0 0 0 3px rgba(239,106,50,.14); }
.inquiry-form textarea { resize: vertical; }
.consent { display: flex; align-items: flex-start; gap: 10px; color: var(--muted); font-size: 12px; font-weight: 500; }
.consent input { margin-top: 3px; accent-color: var(--orange); }
.full-button { width: 100%; }
.form-privacy { text-align: center; color: var(--muted); font-size: 11px; margin: -6px 0 0; }
.form-honeypot { position: absolute !important; left: -9999px !important; width: 1px !important; height: 1px !important; overflow: hidden !important; }
.form-error { display: none; margin: -4px 0 0; color: #b42318; background: #fff1f0; border: 1px solid #ffc9c5; border-radius: 7px; padding: 10px 12px; font-size: 12px; }
.form-error.visible { display: block; }
.inquiry-form button[disabled] { opacity: .65; cursor: wait; transform: none; }
.success-panel { display: none; grid-column: 1 / -1; place-items: center; text-align: center; padding: 70px 30px; }
.success-panel.visible { display: grid; }
.success-panel > span { width: 70px; height: 70px; display: grid; place-items: center; color: white; background: var(--green); border-radius: 50%; font-size: 30px; }
.success-panel h2 { color: var(--navy); font-family: Georgia, serif; font-size: 42px; font-weight: 500; margin: 22px 0 4px; }
.success-panel p { color: var(--muted); margin: 0 0 25px; }
.success-reference { display: block; color: var(--navy); background: var(--soft); border: 1px solid var(--line); border-radius: 8px; padding: 10px 16px; margin: 0 0 25px; font-size: 13px; letter-spacing: .04em; }

.calculation-overlay { position: fixed; inset: 0; background: rgba(5,19,34,.78); backdrop-filter: blur(8px); display: none; place-items: center; z-index: 60; padding: 20px; }
.calculation-overlay.visible { display: grid; }
.calculation-card { width: min(460px, 100%); background: white; border-radius: 18px; padding: 38px; text-align: center; box-shadow: var(--shadow); }
.orbit { width: 68px; height: 68px; border: 2px solid #dce4ea; border-radius: 50%; margin: 0 auto 22px; position: relative; animation: spin 1.1s linear infinite; }
.orbit:before, .orbit:after { content: ""; position: absolute; inset: 50% auto auto 50%; transform: translate(-50%,-50%) rotate(-35deg); height: 7px; border-radius: 5px; background: var(--navy); }
.orbit:before { width: 50px; }
.orbit:after { width: 18px; background: var(--orange); left: 22%; }
.orbit span { position: absolute; width: 10px; height: 10px; background: var(--orange); border-radius: 50%; top: -5px; left: 29px; }
@keyframes spin { to { transform: rotate(360deg); } }
.calculation-card > span { color: var(--orange-dark); text-transform: uppercase; letter-spacing: .1em; font-size: 11px; font-weight: 850; }
.calculation-card h2 { margin: 7px 0 25px; font-family: Georgia, serif; color: var(--navy); font-size: 30px; font-weight: 500; }
.calculation-card ul { list-style: none; padding: 0; margin: 0; text-align: left; display: grid; gap: 10px; }
.calculation-card li { color: #93a1ac; background: #f3f6f8; border-radius: 8px; padding: 12px 14px; font-size: 13px; display: flex; justify-content: space-between; }
.calculation-card li b { opacity: 0; color: var(--green); }
.calculation-card li.done { color: var(--navy); }
.calculation-card li.done b { opacity: 1; }
.toast { position: fixed; bottom: 25px; left: 50%; transform: translate(-50%, 20px); background: var(--navy); color: white; padding: 12px 18px; border-radius: 8px; opacity: 0; pointer-events: none; transition: .25s; z-index: 80; font-size: 13px; box-shadow: 0 12px 30px rgba(0,0,0,.2); }
.toast.visible { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 1050px) {
  .home-screen { flex-direction: column; align-items: stretch; }
  .home-copy { max-width: 780px; }
  .engineering-visual { flex-basis: auto; width: 100%; }
  .application-grid { grid-template-columns: repeat(2, 1fr); }
  .result-grid { grid-template-columns: 1fr; }
  .result-side { grid-template-columns: 1fr 1fr; }
  .disclaimer { grid-column: 1 / -1; }
}

@media (max-width: 800px) {
  .topbar { height: 66px; padding: 0 18px; }
  .brand-copy small, .engineer-status { display: none; }
  .header-actions { gap: 12px; }
  .header-actions .text-button { font-size: 13px; }
  .screen { min-height: calc(100vh - 66px); }
  .home-screen { padding: 42px 20px 60px; gap: 38px; }
  h1 { font-size: clamp(44px, 13vw, 62px); }
  .lead { font-size: 17px; }
  .home-actions { flex-direction: column; }
  .home-actions button { width: 100%; }
  .trust-list { margin-top: 35px; display: grid; gap: 10px; }
  .visual-data { grid-template-columns: 1fr; }
  .visual-data div { border-right: 0; border-bottom: 1px solid var(--line); flex-direction: row; justify-content: space-between; }
  .step-rail { display: none; }
  .step-workspace { min-height: calc(100vh - 66px); }
  .mobile-progress { display: block; padding: 18px 20px 0; color: var(--navy); font-size: 12px; font-weight: 800; }
  .mobile-progress > div { height: 4px; background: #d9e2e7; border-radius: 4px; margin-top: 9px; overflow: hidden; }
  .mobile-progress i { display: block; height: 100%; width: 20%; background: var(--orange); transition: width .25s; }
  .step-panel { padding: 35px 20px 24px; }
  .step-heading { margin-bottom: 25px; }
  .step-heading h2 { font-size: 36px; }
  .application-grid { grid-template-columns: 1fr; }
  .choice-card { min-height: 108px; display: grid; grid-template-columns: 42px 1fr; grid-template-rows: auto auto; column-gap: 15px; padding: 17px; }
  .choice-card.selected { padding: 16px; }
  .choice-icon { grid-row: 1 / 3; margin: 0; align-self: center; }
  .choice-card small { margin-top: 2px; }
  .input-layout, .motion-grid, .review-layout { grid-template-columns: 1fr; }
  .control-card.full { grid-column: auto; }
  .segmented { grid-template-columns: 1fr; }
  .environment-card { grid-template-columns: 45px 1fr; padding-right: 48px; }
  .environment-card.selected { padding-right: 47px; }
  .environment-card b { display: none; }
  .step-footer { position: sticky; bottom: 0; padding: 0 20px; height: 74px; z-index: 10; }
  .footer-hint { display: none; }
  .result-banner { padding: 23px 20px; }
  .result-banner .text-button { display: none; }
  .result-banner h2 { font-size: 22px; }
  .result-grid { width: calc(100% - 28px); margin-top: 16px; }
  .result-product-card { padding: 20px; }
  .product-heading { flex-direction: column; }
  .spec-grid { grid-template-columns: 1fr 1fr; }
  .spec-grid div { border-bottom: 1px solid var(--line); }
  .spec-grid div:nth-child(2) { border-right: 0; }
  .spec-grid div:nth-child(3), .spec-grid div:nth-child(4) { border-bottom: 0; }
  .result-actions { flex-direction: column; }
  .result-actions button { width: 100%; }
  .result-side { grid-template-columns: 1fr; }
  .inquiry-screen { padding: 0; align-items: stretch; }
  .inquiry-wrap { border-radius: 0; grid-template-columns: 1fr; }
  .inquiry-intro { padding: 42px 24px 32px; }
  .inquiry-intro h2 { font-size: 35px; padding-right: 28px; }
  .inquiry-form { padding: 34px 24px; }
  .form-row { grid-template-columns: 1fr; }
  .close-inquiry { position: fixed; }
}

@media (prefers-reduced-motion: reduce) {
  *, *:before, *:after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; transition-duration: .01ms !important; }
}