:root {
  --accent: #C4411D;
  --accent-2: #E4572E;
  --accent-dark: #9E3217;
  --ink: #1A1A1A;
  --ink-soft: #4D4D4D;
  --muted: #6F6F6F;
  --line: #E7E5E3;
  --panel: #FAFAF9;
  --tint: #FFF2EC;
  --tint-strong: #FFE4D8;
  --green: #16856C;
  --purple: #5B5BD6;
  --yellow: #F5A524;
  --pink: #C2459A;
  --navy: #2F4B7C;
  --dark: #1F2022;
  --radius: 8px;
  --shadow: 0 18px 50px rgba(35, 25, 20, .08);
  --max: 1200px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; overflow-x: hidden; }
body { overflow-x: hidden; max-width: 100vw; margin: 0; color: var(--ink); background: #fff; font-family: "Source Sans 3", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; font-size: 16px; line-height: 1.5; }
body.no-scroll { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; }
button { cursor: pointer; }
img, svg { max-width: 100%; display: block; }
[hidden] { display: none !important; }
:focus-visible { outline: 3px solid rgba(228,87,46,.45); outline-offset: 3px; }
.container { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; }
.eyebrow { margin: 0 0 12px; color: var(--accent); font-size: 13px; line-height: 1; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.display { margin: 0; font-size: clamp(2.7rem, 6vw, 4.8rem); line-height: 1.04; letter-spacing: -.055em; font-weight: 800; }
.section-title { margin: 0; font-size: clamp(2rem, 4vw, 3rem); line-height: 1.16; letter-spacing: -.035em; }
.section-lede { max-width: 640px; margin: 14px auto 0; color: var(--ink-soft); font-size: 18px; line-height: 1.55; }
.center { text-align: center; }
.muted { color: var(--muted); }

/* navigation */
.site-header { position: sticky; top: 0; z-index: 50; border-bottom: 1px solid var(--line); background: rgba(255,255,255,.95); backdrop-filter: blur(14px); }
.navbar { display: flex; align-items: center; min-height: 64px; gap: 18px; }
.brand { display: inline-flex; align-items: center; gap: 9px; flex: none; font-weight: 800; font-size: 23px; letter-spacing: -.045em; }
.brand-mark { width: 36px; height: 36px; border-radius: 8px; background: var(--accent-2); }
.nav-links { display: flex; align-items: center; gap: 18px; margin-left: 12px; color: var(--ink-soft); font-weight: 600; }
.nav-links a:hover, .footer a:hover { color: var(--accent); }
.nav-actions { display: flex; align-items: center; gap: 9px; margin-left: auto; }
.nav-actions .btn { min-height: 38px; }
.lang-switch { display: inline-flex; gap: 4px; align-items: center; border: 1px solid var(--line); border-radius: 6px; padding: 7px 10px; background: #fff; color: var(--muted); font-size: 14px; }
.lang-switch .active { color: var(--ink); font-weight: 800; }
.lang-switch a:hover { color: var(--accent); }
.menu-toggle { display: none; min-width: 42px; min-height: 40px; border: 1px solid var(--line); border-radius: 6px; background: #fff; }
.mobile-menu { display: none; border-top: 1px solid var(--line); background: #fff; }
.mobile-menu a { display: block; padding: 13px 0; border-bottom: 1px solid var(--line); color: var(--ink-soft); font-weight: 600; }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; border: 1px solid transparent; border-radius: 5px; padding: 0 18px; font-weight: 800; line-height: 1; transition: transform .18s ease, background .18s ease, border-color .18s ease; }
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-secondary { border-color: var(--accent); color: var(--accent); background: #fff; }
.btn-secondary:hover { background: var(--tint); }
.btn-quiet { border-color: var(--line); color: var(--ink); background: #fff; }
.btn-quiet:hover { border-color: var(--accent); color: var(--accent); }
.btn-small { min-height: 36px; padding: 0 13px; font-size: 14px; }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }
.btn:disabled:hover { transform: none; background: inherit; }

/* hero */
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(440px, .94fr); align-items: center; gap: 66px; min-height: 620px; padding: 76px 0 72px; }
.hero-copy p { max-width: 560px; margin: 18px 0 0; color: var(--ink-soft); font-size: 20px; line-height: 1.55; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.hero-note { display: flex; align-items: center; gap: 8px; margin-top: 18px; color: var(--muted); font-size: 14px; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); }
.hero-visual { position: relative; min-height: 440px; }
.hero-shape { position: absolute; border-radius: 18px; transform: rotate(18deg); }
.hero-shape.one { top: 6%; right: 13%; width: 200px; height: 200px; background: var(--tint); }
.hero-shape.two { bottom: 1%; left: 2%; width: 148px; height: 148px; background: #FFE7DD; transform: rotate(-18deg); }
.hero-window { position: absolute; inset: 48px 20px 18px 42px; overflow: hidden; border: 1px solid #D9D6D4; border-radius: 3px; background: #fff; box-shadow: 0 28px 60px rgba(36, 24, 18, .13); }
.window-head { display: flex; align-items: center; gap: 8px; height: 42px; padding: 0 14px; border-bottom: 1px solid #ECEAE8; font-size: 12px; font-weight: 800; }
.window-mark { width: 18px; height: 18px; border-radius: 4px; background: var(--accent-2); }
.window-tools { display: flex; align-items: center; gap: 8px; padding: 8px 12px; color: #858585; }
.window-tool { width: 18px; height: 18px; border-radius: 3px; background: #F0EFED; }
.window-body { display: grid; place-items: center; min-height: 270px; padding: 25px; background: #F4F3F2; }
.upload-card { width: min(290px, 90%); border: 2px dashed #E6B9A8; border-radius: 8px; padding: 25px 20px; background: #fff; text-align: center; }
.upload-icon { display: grid; place-items: center; width: 48px; height: 48px; margin: 0 auto 12px; border-radius: 8px; background: var(--tint); color: var(--accent); font-size: 25px; }
.upload-card strong { display: block; font-size: 18px; }
.upload-card small { display: block; margin-top: 4px; color: var(--muted); }
.upload-progress { height: 8px; margin-top: 18px; border-radius: 999px; background: #F9D8CC; overflow: hidden; }
.upload-progress span { display: block; width: 68%; height: 100%; border-radius: inherit; background: var(--accent-2); }
.hero-badge { position: absolute; display: flex; align-items: center; gap: 8px; padding: 11px 13px; border-radius: 6px; background: #fff; box-shadow: var(--shadow); font-size: 13px; font-weight: 800; }
.hero-badge b { color: var(--accent); }
.hero-badge.a { top: 26px; left: 14px; }
.hero-badge.b { right: 0; bottom: 12px; }

/* tool cards */
.section { padding: 88px 0; }
.section-tint { background: var(--tint); }
.section-head { text-align: center; }
.tool-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 14px; margin-top: 34px; }
.tool-card { position: relative; display: flex; align-items: flex-start; gap: 13px; min-height: 136px; padding: 20px 46px 18px 18px; border: 1px solid var(--line); border-radius: 6px; background: #fff; box-shadow: 0 3px 12px rgba(0,0,0,.025); transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease; }
.tool-card:hover { border-color: #E9A38D; box-shadow: 0 12px 25px rgba(196,65,29,.1); transform: translateY(-2px); }
.tool-icon { display: grid; flex: none; place-items: center; width: 38px; height: 38px; border-radius: 6px; color: #fff; font-size: 18px; font-weight: 800; }
.tool-card h3 { margin: 0; font-size: 17px; line-height: 1.25; }
.tool-card p { margin: 5px 0 0; color: var(--muted); font-size: 14px; line-height: 1.4; }
.tool-arrow { position: absolute; top: 20px; right: 17px; color: var(--accent); font-size: 20px; }
.more-link { display: inline-flex; align-items: center; gap: 7px; margin-top: 24px; color: var(--accent); font-weight: 800; }

/* interactive tools */
.tool-workspace { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 24px; margin-top: 38px; }
.tool-panel { scroll-margin-top: 84px; border: 1px solid var(--line); border-radius: 8px; background: #fff; box-shadow: 0 9px 28px rgba(35,25,20,.05); }
.tool-panel + .tool-panel { margin-top: 18px; }
.tool-panel-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; padding: 19px 20px; border-bottom: 1px solid var(--line); }
.tool-panel-head h3 { margin: 0; font-size: 21px; line-height: 1.2; }
.tool-panel-head p { margin: 5px 0 0; color: var(--muted); font-size: 14px; }
.panel-body { padding: 20px; }
.file-drop { display: grid; place-items: center; min-height: 148px; border: 2px dashed #E7B7A6; border-radius: 8px; padding: 24px; background: #FFFAF8; text-align: center; transition: background .18s ease, border-color .18s ease; }
.file-drop.dragover { border-color: var(--accent); background: var(--tint); }
.file-drop strong { display: block; margin-bottom: 4px; }
.file-drop span { color: var(--muted); font-size: 14px; }
.file-drop input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.file-list { display: grid; gap: 8px; margin-top: 12px; }
.file-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 9px 11px; border: 1px solid var(--line); border-radius: 5px; background: var(--panel); font-size: 14px; }
.file-row span:first-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-row button { border: 0; background: transparent; color: var(--muted); }
.file-row button:hover { color: var(--accent); }
.form-row { display: flex; flex-wrap: wrap; align-items: end; gap: 12px; margin-top: 14px; }
.field { display: grid; gap: 6px; flex: 1 1 170px; color: var(--ink-soft); font-size: 14px; font-weight: 700; }
.field input, .field select { min-height: 42px; width: 100%; border: 1px solid #D8D4D0; border-radius: 5px; padding: 0 11px; background: #fff; color: var(--ink); }
.field input:focus, .field select:focus { border-color: var(--accent); outline: 2px solid rgba(228,87,46,.15); }
.range-field { flex: 1 1 240px; }
.range-wrap { display: flex; align-items: center; gap: 10px; }
.range-wrap input { min-height: auto; padding: 0; accent-color: var(--accent); }
.range-output { min-width: 62px; color: var(--accent); text-align: right; font-size: 14px; font-weight: 800; }
.status { min-height: 22px; margin-top: 13px; color: var(--muted); font-size: 14px; }
.status.success { color: var(--green); }
.status.error { color: #B23131; }
.helper { margin-top: 10px; color: var(--muted); font-size: 13px; line-height: 1.45; }
.result-box { display: grid; gap: 11px; margin-top: 14px; padding: 14px; border-radius: 6px; background: var(--panel); }
.result-line { display: flex; justify-content: space-between; gap: 15px; font-size: 14px; }
.result-line strong { text-align: right; }
.tool-column .tool-panel { margin-top: 0; }
.tool-column + .tool-column { display: grid; align-content: start; gap: 18px; }
.canvas-preview { display: grid; place-items: center; min-height: 150px; margin-top: 14px; border: 1px solid var(--line); border-radius: 6px; background: #f6f5f4; overflow: hidden; }
.canvas-preview canvas { max-width: 100%; max-height: 260px; }
.badge-note { display: inline-flex; align-items: center; gap: 6px; color: var(--green); font-size: 13px; font-weight: 800; }

/* feature/value sections */
.feature-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: center; gap: 64px; max-width: 1100px; margin: 0 auto; }
.feature-split.reverse .feature-copy { order: 2; }
.feature-split.reverse .feature-art { order: 1; }
.feature-copy h2 { margin: 0; font-size: clamp(2rem, 4vw, 3rem); line-height: 1.16; letter-spacing: -.035em; }
.feature-copy p { margin: 15px 0 0; color: var(--ink-soft); font-size: 18px; line-height: 1.55; }
.check-list { display: grid; gap: 11px; margin: 24px 0 0; }
.check-list li { display: flex; gap: 10px; align-items: flex-start; color: var(--ink-soft); }
.check-list li::before { content: "✓"; display: grid; place-items: center; flex: none; width: 22px; height: 22px; border-radius: 50%; background: #E1F4EF; color: var(--green); font-weight: 900; }
.feature-art { position: relative; min-height: 330px; }
.paper-stack { position: absolute; inset: 28px 24px 12px 44px; border: 1px solid #DED9D5; border-radius: 5px; background: #fff; transform: rotate(-4deg); box-shadow: var(--shadow); }
.paper-stack::before, .paper-stack::after { content: ""; position: absolute; inset: -14px 14px 14px -14px; z-index: -1; border: 1px solid #E8E0DC; border-radius: inherit; background: #FFF9F6; transform: rotate(7deg); }
.paper-stack::after { inset: 16px -18px -16px 18px; transform: rotate(13deg); background: #FFEDE5; z-index: -2; }
.paper-inner { display: grid; gap: 14px; padding: 32px; }
.skeleton-line { height: 10px; border-radius: 999px; background: #EEEAE8; }
.skeleton-line.short { width: 44%; }
.skeleton-line.mid { width: 72%; }
.skeleton-line.long { width: 93%; }
.highlight-box { margin-top: 8px; padding: 12px; border: 1px solid #E9A38D; border-radius: 5px; color: var(--accent); font-size: 13px; font-weight: 800; }

/* guide/article */
.article-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 14px; margin-top: 32px; }
.article-card { display: flex; flex-direction: column; min-height: 210px; padding: 20px; border: 1px solid var(--line); border-radius: 6px; background: #fff; }
.article-card:hover { border-color: #E9A38D; box-shadow: 0 10px 24px rgba(196,65,29,.08); }
.article-card .tag { color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.article-card h3 { margin: 10px 0 0; font-size: 20px; line-height: 1.25; }
.article-card p { margin: 8px 0 0; color: var(--muted); font-size: 14px; line-height: 1.45; }
.article-card .read { display: inline-flex; gap: 6px; align-items: center; margin-top: auto; padding-top: 18px; color: var(--accent); font-weight: 800; font-size: 14px; }
.article-page { padding: 76px 0 96px; }
.article-wrap { max-width: 780px; margin: 0 auto; }
.article-wrap h1 { margin: 0; font-size: clamp(2.3rem, 5vw, 4rem); line-height: 1.08; letter-spacing: -.045em; }
.article-meta { margin-top: 12px; color: var(--muted); font-size: 14px; }
.article-content { margin-top: 36px; color: var(--ink-soft); font-size: 18px; line-height: 1.7; }
.article-content h2 { margin: 38px 0 10px; color: var(--ink); font-size: 28px; line-height: 1.2; }
.article-content h3 { margin: 28px 0 7px; color: var(--ink); font-size: 21px; }
.article-content p, .article-content ul, .article-content ol { margin: 14px 0; }
.article-content ul, .article-content ol { padding-left: 22px; }
.article-content li { margin: 7px 0; }
.article-callout { margin: 24px 0; padding: 18px 20px; border-left: 4px solid var(--accent); border-radius: 4px; background: var(--tint); }

/* footer */
.footer { margin-top: 70px; border-top: 1px solid var(--line); background: #fff; }
.footer-main { display: grid; grid-template-columns: 1.2fr 2fr; gap: 48px; padding: 52px 0 40px; }
.footer-brand p { max-width: 300px; margin: 16px 0 0; color: var(--muted); }
.footer-nav { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 24px; }
.footer-nav h3 { margin: 0 0 10px; font-size: 14px; }
.footer-nav a { display: block; padding: 5px 0; color: var(--muted); font-size: 14px; }
.footer-bar { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 64px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.footer-bar nav { display: flex; gap: 18px; }
.footer-bar a:hover { color: var(--accent); }

/* design system */
.token-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 14px; margin-top: 28px; }
.token-card { border: 1px solid var(--line); border-radius: 6px; padding: 18px; background: #fff; }
.swatch { height: 62px; margin-bottom: 13px; border-radius: 5px; }
.token-card code { color: var(--muted); font-size: 13px; }
.specimen { display: grid; gap: 22px; margin-top: 34px; }
.specimen-row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; padding: 20px; border: 1px solid var(--line); border-radius: 6px; }

/* errors */
.error-page { display: grid; place-items: center; min-height: 70vh; padding: 70px 24px; text-align: center; }
.error-page .number { color: var(--accent); font-size: clamp(5rem, 20vw, 12rem); line-height: .8; letter-spacing: -.1em; font-weight: 800; }
.error-page p { max-width: 500px; margin: 24px auto 0; color: var(--muted); font-size: 18px; }

@media (max-width: 1080px) {
  .nav-links { gap: 12px; margin-left: 3px; font-size: 14px; }
  .hero { grid-template-columns: minmax(0, 1fr) minmax(360px, .9fr); gap: 30px; }
  .tool-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
}
@media (max-width: 820px) {
  .container { width: min(100% - 32px, var(--max)); }
  .nav-links, .nav-actions > .btn-primary { display: none; }
  .menu-toggle { display: inline-grid; place-items: center; }
  .mobile-menu.open { display: block; }
  .hero { grid-template-columns: 1fr; min-height: 0; padding: 58px 0 54px; }
  .hero-copy p { font-size: 18px; }
  .hero-visual { min-height: 370px; max-width: 600px; width: 100%; margin: 0 auto; }
  .tool-workspace { grid-template-columns: 1fr; }
  .feature-split, .feature-split.reverse { grid-template-columns: 1fr; gap: 32px; }
  .feature-split.reverse .feature-copy, .feature-split.reverse .feature-art { order: initial; }
  .feature-art { overflow: hidden; min-height: 280px; max-width: 600px; width: 100%; margin: 0 auto; }
  .article-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .footer-main { grid-template-columns: 1fr; gap: 30px; }
}
@media (max-width: 560px) {
  .container { width: calc(100% - 32px); }
  .navbar { min-height: 58px; gap: 10px; }
  .brand { font-size: 21px; }
  .brand-mark { width: 33px; height: 33px; }
  .nav-actions { gap: 6px; }
  .lang-switch { padding: 6px 8px; font-size: 13px; }
  .hero { padding: 42px 0 42px; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .hero-visual { min-height: 280px; }
  .hero-window { inset: 32px 8px 8px 10px; }
  .hero-badge { padding: 8px 9px; font-size: 11px; }
  .hero-badge.a { top: 10px; left: 0; }
  .hero-badge.b { right: 0; bottom: 0; }
  .hero-shape.one { width: 130px; height: 130px; right: 8%; }
  .hero-shape.two { width: 90px; height: 90px; left: 0; }
  .section { padding: 62px 0; }
  .section-lede { font-size: 16px; }
  .tool-grid, .article-grid, .token-grid { grid-template-columns: 1fr; }
  .tool-card { min-height: 120px; }
  .tool-panel-head { padding: 16px; }
  .panel-body { padding: 16px; }
  .file-drop { min-height: 130px; padding: 18px; }
  .form-row { align-items: stretch; flex-direction: column; }
  .field, .range-field { flex-basis: auto; }
  .form-row .btn { width: 100%; }
  .feature-copy p { font-size: 16px; }
  .article-page { padding: 48px 0 70px; }
  .article-content { font-size: 16px; }
  .footer-main { padding-top: 38px; }
  .footer-nav { grid-template-columns: 1fr 1fr; }
  .footer-bar { align-items: flex-start; flex-direction: column; padding: 18px 0; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; } }


main,.site-header,.footer{max-width:100vw;overflow-x:hidden}