/* ============================================================
   FBATools / DengTTSTools shared stylesheet
   2026-07-21 v4 unified definitions, animations, mobile-first
   ============================================================ */

:root {
  --bg: #FBFBFA;
  --surface: #FFFFFF;
  --surface-soft: #F7F6F3;
  --ink: #2F3437;
  --ink-soft: #787774;
  --ink-dim: #B4B2AD;
  --line: #EAEAEA;
  --line-soft: #F0EFEC;
  --accent: #111111;
  --accent-2: #333333;
  --font-display: 'Newsreader', 'Lyon Text', 'Instrument Serif', Georgia, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', serif;
  --font-body: 'Geist', 'Inter Tight', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Geist Mono', 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --r-sm: 4px; --r-md: 6px; --r-lg: 12px;
  --s-1: 4px; --s-2: 8px; --s-3: 12px; --s-4: 16px;
  --s-5: 24px; --s-6: 32px; --s-7: 48px; --s-8: 64px; --s-9: 96px; --s-10: 128px;
  --max-w: 1080px;
  --content-w: 720px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

body.home {
  --bg: #0B0B0F; --surface: #FFFFFF; --surface-soft: #F7F6F3;
  --ink: #111114; --ink-soft: #5A5A66; --ink-dim: #9B9BAA;
  --line: #ECECEC; --line-soft: #F4F4F2;
  --accent: #111114; --accent-2: #333339;
}

@keyframes fadeUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes scaleIn { from { opacity: 0; transform: scale(0.96); } to { opacity: 1; transform: scale(1); } }
@keyframes heroFloat {
  0%,100% { background-position: 50% 0%, 15% 30%, 90% 40%, 50% 100%; }
  25% { background-position: 55% 5%, 10% 25%, 85% 35%, 45% 95%; }
  50% { background-position: 45% 10%, 20% 35%, 95% 45%, 55% 100%; }
  75% { background-position: 50% 0%, 15% 30%, 90% 40%, 50% 100%; }
}
@keyframes calcGlow {
  0%,100% { box-shadow: 0 30px 80px -20px rgba(0,0,0,.55), 0 0 0 1px rgba(255,255,255,.04) inset, 0 1px 0 rgba(255,255,255,.1) inset, 0 0 40px -10px rgba(6,182,212,.12); }
  50% { box-shadow: 0 30px 80px -20px rgba(0,0,0,.55), 0 0 0 1px rgba(255,255,255,.04) inset, 0 1px 0 rgba(255,255,255,.1) inset, 0 0 60px -10px rgba(6,182,212,.22); }
}
@keyframes tabfade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .35; } }
@keyframes shimmer { from { transform: translateX(-100%); } to { transform: translateX(100%); } }

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: var(--font-body); font-size: 16px; line-height: 1.6; color: var(--ink); background: var(--bg); -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-rendering: optimizeLegibility; }
a { color: inherit; text-decoration: none; text-underline-offset: 3px; text-decoration-thickness: 1px; transition: color .15s var(--ease); }
a:hover { color: var(--accent); text-decoration: underline; text-decoration-color: var(--line); }
::selection { background: #111; color: #fff; }
body.home ::selection { background: #FF7A45; color: #fff; }
img, svg { display: block; max-width: 100%; height: auto; }
.skip-link { position: absolute; top: -40px; left: 16px; padding: 8px 14px; background: var(--accent); color: #fff; border-radius: var(--r-sm); font-size: 14px; z-index: 100; transition: top .15s var(--ease); }
.skip-link:focus { top: 16px; }
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
main { scroll-margin-top: 80px; }

.site-header { position: sticky; top: 0; z-index: 50; background: rgba(251,251,250,.85); -webkit-backdrop-filter: saturate(140%) blur(8px); backdrop-filter: saturate(140%) blur(8px); border-bottom: 1px solid var(--line-soft); padding-left: env(safe-area-inset-left); padding-right: env(safe-area-inset-right); }
body.home .site-header, body.tool-calc .site-header { background: rgba(11,11,15,.55); border-bottom: 1px solid rgba(255,255,255,.06); -webkit-backdrop-filter: saturate(160%) blur(14px); backdrop-filter: saturate(160%) blur(14px); }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 18px 0; }
body.home .header-inner { padding: 16px 0; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 500; font-size: 18px; letter-spacing: -0.01em; color: var(--ink); }
body.home .logo, body.tool-calc .logo { color: #fff; }
.logo img, .logo svg { width: 28px; height: 28px; border-radius: 7px; }
.main-nav { display: flex; gap: 4px; font-size: 14px; }
.main-nav a { color: var(--ink-soft); padding: 8px 12px; border-radius: var(--r-sm); transition: color .15s var(--ease), background .15s var(--ease); text-decoration: none; }
.main-nav a:hover { color: var(--ink); background: var(--surface-soft); text-decoration: none; }
.main-nav a[aria-current="page"], .main-nav a.active { color: var(--ink); background: var(--surface-soft); }
body.home .main-nav a, body.tool-calc .main-nav a { color: rgba(255,255,255,.72); }
body.home .main-nav a:hover, body.tool-calc .main-nav a:hover { color: #fff; background: rgba(255,255,255,.08); }
body.home .main-nav a[aria-current="page"], body.home .main-nav a.active,
body.tool-calc .main-nav a[aria-current="page"], body.tool-calc .main-nav a.active { color: #fff; background: rgba(255,255,255,.1); }
@media (max-width: 640px) { .main-nav { gap: 0; } .main-nav a { padding: 6px 8px; font-size: 13px; } .header-inner { padding: 14px 0; } }
@media (max-width: 480px) {
  .main-nav { gap: 0; }
  .main-nav a { padding: 5px 6px; font-size: 12px; letter-spacing: -0.01em; }
  .logo { font-size: 16px; gap: 8px; }
  .logo img, .logo svg { width: 24px; height: 24px; }
  .header-inner { padding: 12px 0; }
}
@media (max-width: 360px) {
  .main-nav a { padding: 4px 5px; font-size: 11px; }
  .logo span { display: none; }
}

.eyebrow { display: inline-flex; align-items: center; gap: 6px; font-family: var(--font-mono); font-size: 11px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.08em; color: var(--tag-green-fg, #346538); background: var(--tag-green-bg, #EDF3EC); padding: 5px 10px; border-radius: 9999px; margin-bottom: var(--s-5); }

body.home { color: #111114; overflow-x: hidden; }
.hero-v3 { position: relative; padding: 140px 0 100px; color: #fff; text-align: center; isolation: isolate; overflow: hidden; }
@media (max-width: 640px) { .hero-v3 { padding: 96px 0 64px; } }
@media (max-width: 480px) { .hero-v3 { padding: 72px 0 48px; } }
.hero-v3::before { content: ""; position: absolute; inset: 0; z-index: -2; background: radial-gradient(80% 60% at 50% 0%, var(--hero-glow-1,#FF7A45) 0%, transparent 60%), radial-gradient(60% 50% at 15% 30%, var(--hero-glow-2,#FF4D8D) 0%, transparent 55%), radial-gradient(70% 60% at 90% 40%, var(--hero-glow-3,#8B5CF6) 0%, transparent 60%), radial-gradient(80% 50% at 50% 100%, var(--hero-glow-4,#1E1B4B) 0%, transparent 70%), linear-gradient(180deg, #0B0B0F 0%, #14121E 60%, #0B0B0F 100%); background-size: 200% 200%; animation: heroFloat 20s ease-in-out infinite; }
.hero-v3::after { content: ""; position: absolute; inset: 0; z-index: -1; background-image: radial-gradient(rgba(255,255,255,.06) 1px, transparent 1px); background-size: 22px 22px; mask-image: radial-gradient(ellipse 80% 60% at 50% 35%, #000 30%, transparent 80%); -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 35%, #000 30%, transparent 80%); pointer-events: none; }
.hero-v3 .container { max-width: 1180px; }
.hero-v3 .hero-eyebrow { animation: fadeUp .6s var(--ease) forwards; animation-delay: calc(var(--i, 0) * 80ms); opacity: 0; }
.hero-v3 .hero-title { animation: fadeUp .6s var(--ease) forwards; animation-delay: calc(var(--i, 1) * 80ms); opacity: 0; }
.hero-v3 .hero-lede { animation: fadeUp .6s var(--ease) forwards; animation-delay: calc(var(--i, 2) * 80ms); opacity: 0; }
.hero-v3 .hero-cta-row { animation: fadeUp .6s var(--ease) forwards; animation-delay: calc(var(--i, 3) * 80ms); opacity: 0; }
.hero-v3 .calc-window { animation: scaleIn .7s var(--ease) forwards; animation-delay: calc(var(--i, 4) * 80ms); opacity: 0; }
.hero-v3 .hero-stats { animation: fadeUp .6s var(--ease) forwards; animation-delay: .5s; opacity: 0; }
.hero-v3 .hero-meta { animation: fadeIn .6s var(--ease) forwards; animation-delay: .6s; opacity: 0; }
.hero-eyebrow { display: inline-flex; align-items: center; gap: 8px; padding: 7px 14px 7px 8px; border-radius: 9999px; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.15); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); font-family: var(--font-mono); font-size: 12px; font-weight: 500; color: #fff; letter-spacing: 0.02em; }
.hero-eyebrow .dot { width: 8px; height: 8px; border-radius: 50%; background: #4ADE80; box-shadow: 0 0 12px #4ADE80; }
.hero-title { font-family: var(--font-display); font-size: clamp(2.6rem, 6vw, 4.6rem); line-height: 1.04; letter-spacing: -0.025em; font-weight: 500; margin: 24px auto 0; max-width: 980px; color: #fff; }
.hero-title em { font-style: italic; background: linear-gradient(135deg, #FFD1A8 0%, #FF7A45 50%, #FF4D8D 100%); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-lede { font-size: clamp(1.05rem, 1.6vw, 1.2rem); line-height: 1.55; color: rgba(255,255,255,.78); max-width: 640px; margin: 20px auto 0; }
.hero-cta-row { display: flex; gap: 12px; justify-content: center; margin: 32px 0 56px; flex-wrap: wrap; }
@media (max-width: 480px) { .hero-cta-row { margin: 24px 0 40px; } .hero-cta-row .btn { padding: 10px 16px; font-size: 14px; } }
.hero-meta { margin: 32px 0 0; display: inline-flex; gap: 14px; align-items: center; font-family: var(--font-mono); font-size: 12px; color: rgba(255,255,255,.55); flex-wrap: wrap; justify-content: center; }
.hero-meta .dot-sep { width: 4px; height: 4px; border-radius: 50%; background: rgba(255,255,255,.3); }
.calc-window { position: relative; max-width: 880px; margin: 0 auto; border-radius: 16px; background: linear-gradient(135deg, rgba(15,23,42,.92), rgba(30,27,75,.88)); border: 1px solid rgba(255,255,255,.14); backdrop-filter: blur(18px) saturate(160%); -webkit-backdrop-filter: blur(18px) saturate(160%); box-shadow: 0 30px 80px -20px rgba(0,0,0,.55), 0 0 0 1px rgba(255,255,255,.04) inset, 0 1px 0 rgba(255,255,255,.1) inset; overflow: hidden; text-align: left; animation: calcGlow 4s ease-in-out infinite; }
.calc-titlebar { display: flex; align-items: center; gap: 10px; padding: 12px 16px; background: rgba(0,0,0,.25); border-bottom: 1px solid rgba(255,255,255,.08); }
.calc-titlebar .traffic { display: flex; gap: 6px; }
.calc-titlebar .traffic span { width: 11px; height: 11px; border-radius: 50%; }
.calc-titlebar .traffic span:nth-child(1) { background: #FF5F57; }
.calc-titlebar .traffic span:nth-child(2) { background: #FEBC2E; }
.calc-titlebar .traffic span:nth-child(3) { background: #28C840; }
.calc-titlebar .calc-name { font-family: var(--font-mono); font-size: 12px; color: rgba(255,255,255,.7); margin-left: 6px; }
.calc-titlebar .calc-badge { margin-left: auto; font-family: var(--font-mono); font-size: 11px; color: #4ADE80; background: rgba(74,222,128,.12); border: 1px solid rgba(74,222,128,.25); padding: 3px 8px; border-radius: 9999px; }
.calc-body { display: grid; grid-template-columns: 1.1fr 1fr; gap: 0; }
.calc-inputs, .calc-results { padding: 28px 28px 32px; }
@media (max-width: 480px) { .calc-inputs, .calc-results { padding: 20px 18px 24px; } }
.calc-inputs { border-right: 1px solid rgba(255,255,255,.08); }
.calc-results { display: flex; flex-direction: column; background: linear-gradient(180deg, rgba(255,255,255,.06) 0%, rgba(255,255,255,.02) 100%); }
.calc-field { margin-bottom: 16px; }
.calc-field label { display: block; font-family: var(--font-mono); font-size: 12px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.08em; color: rgba(255,255,255,.85); margin-bottom: 6px; }
.calc-field .input { display: flex; align-items: center; background: rgba(0,0,0,.45); border: 1px solid rgba(255,255,255,.12); border-radius: 10px; padding: 14px 18px; min-height: 48px; box-shadow: inset 0 1px 2px rgba(0,0,0,.3); font-family: var(--font-mono); font-size: 15px; color: #fff; }
.calc-field .input .prefix { color: rgba(255,255,255,.5); margin-right: 4px; }
.calc-result-row { display: flex; justify-content: space-between; align-items: baseline; padding: 10px 0; border-bottom: 1px dashed rgba(255,255,255,.1); font-family: var(--font-mono); font-size: 14px; }
.calc-result-row:last-child { border-bottom: 0; }
.calc-result-row .lbl { color: rgba(255,255,255,.8); }
.calc-result-row .val { color: #fff; font-weight: 500; }
.calc-result-row.highlight { margin-top: auto; padding: 18px 20px; border-radius: 12px; background: linear-gradient(135deg, rgba(255,122,69,.18), rgba(255,77,141,.18)); border: 1px solid rgba(255,122,69,.4); font-size: 16px; }
.calc-result-row.highlight .lbl { color: #FFD1A8; font-family: var(--font-body); font-size: 13px; text-transform: uppercase; letter-spacing: 0.06em; }
.calc-result-row.highlight .val { color: #fff; font-size: 22px; font-weight: 600; }
.calc-result-row.group-end { border-bottom: 2px solid rgba(255,255,255,.2); padding-bottom: 14px; margin-bottom: 6px; }
.calc-result-row.group-start { padding-top: 14px; border-top: 1px solid rgba(255,255,255,.15); }
.calc-result-row.roi-row { flex-direction: column; align-items: stretch; gap: 4px; }
.calc-result-row.roi-row .roi-line { display: flex; justify-content: space-between; align-items: baseline; font-family: var(--font-mono); font-size: 13px; }
.calc-result-row.roi-row .roi-line .roi-lbl { color: rgba(255,255,255,.6); }
.calc-result-row.roi-row .roi-line .roi-val { color: #fff; font-weight: 500; }

@media (max-width: 720px) { .calc-body { grid-template-columns: 1fr; } .calc-inputs { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.08); } }
@media (max-width: 720px) and (min-width: 481px) { .calc-inputs { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; } .calc-inputs h2 { grid-column: 1 / -1; } .calc-field { break-inside: avoid; } }
@media (max-width: 480px) { .calc-inputs { display: block; } }

.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border-radius: 10px; font-family: var(--font-body); font-size: 15px; font-weight: 500; text-decoration: none; transition: transform .2s var(--ease), box-shadow .2s var(--ease), background .2s var(--ease), color .2s var(--ease); border: 1px solid transparent; cursor: pointer; }
.btn .arr { transition: transform .25s var(--ease); }
.btn:hover .arr { transform: translateX(3px); }
.btn-primary { background: #fff; color: #111114; box-shadow: 0 10px 30px -8px rgba(0,0,0,.5), 0 0 0 1px rgba(255,255,255,.5) inset; }
.btn-primary:hover { background: #fff; color: #111114; text-decoration: none; transform: translateY(-1px); box-shadow: 0 14px 36px -8px rgba(0,0,0,.6), 0 0 0 1px rgba(255,255,255,.5) inset; }
.btn-ghost { background: rgba(255,255,255,.06); color: #fff; border-color: rgba(255,255,255,.16); backdrop-filter: blur(8px); }
.btn-ghost:hover { background: rgba(255,255,255,.12); color: #fff; text-decoration: none; border-color: rgba(255,255,255,.24); }

.home-section { padding: 96px 0; background: #FFFFFF; }
@media (max-width: 640px) { .home-section { padding: 64px 0; } }
@media (max-width: 480px) { .home-section { padding: 48px 0; } }
.home-section.alt { background: #F7F6F3; }
.home-section.dark { background: #0B0B0F; color: #fff; }
.home-section .container { max-width: 1180px; }
.section-eyebrow { display: inline-block; font-family: var(--font-mono); font-size: 12px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.12em; color: var(--brand-1, #F97316); margin-bottom: 16px; }
.section-title { font-family: var(--font-display); font-size: clamp(2rem, 3.6vw, 2.8rem); line-height: 1.1; letter-spacing: -0.02em; font-weight: 500; margin: 0 0 16px; max-width: 720px; }
.section-sub { font-size: 17px; line-height: 1.55; color: var(--ink-soft); max-width: 640px; margin: 0 0 56px; }
@media (max-width: 640px) { .section-sub { font-size: 15px; margin-bottom: 40px; } }
.home-section.dark .section-title { color: #FFFFFF; }
.home-section.dark .section-sub { color: rgba(255,255,255,.7); }

.bento-v3 { display: grid; grid-template-columns: repeat(6, 1fr); grid-auto-flow: dense; gap: 16px; }
@media (max-width: 900px) { .bento-v3 { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 640px) { .bento-v3 { grid-template-columns: 1fr; } }
.bento-card { position: relative; padding: 28px; background: #fff; border-radius: 16px; border: 1px solid var(--line); overflow: hidden; min-height: 240px; display: flex; flex-direction: column; opacity: 0; animation: fadeUp .6s var(--ease) forwards; animation-delay: calc(var(--i, 0) * 80ms); transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease); transform-style: preserve-3d; }
@media (max-width: 480px) { .bento-card { padding: 20px; min-height: 200px; } .bento-card h3 { font-size: 1.25rem; } .bento-card .stat-big { font-size: 1.8rem; } }
.bento-card.card-short { min-height: 200px; }
.bento-card:hover { transform: translateY(-3px) rotateX(1deg); box-shadow: 0 18px 40px -16px rgba(15,15,30,.18); border-color: transparent; }
.bento-card::after { content: ""; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: linear-gradient(135deg, transparent 30%, rgba(255,255,255,.08) 50%, transparent 70%); transform: translateX(-100%); transition: transform .6s var(--ease); pointer-events: none; }
.bento-card:hover::after { transform: translateX(100%); }
.bento-card .num { font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-soft); margin-bottom: 18px; }
.bento-card h3 { font-family: var(--font-display); font-size: 1.5rem; line-height: 1.2; letter-spacing: -0.015em; font-weight: 500; margin: 0 0 10px; color: var(--ink); }
.bento-card p { font-size: 15px; line-height: 1.55; color: var(--ink-soft); margin: 0; }
.bento-card .card-edge { position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(90deg, var(--brand-1, #F97316), var(--brand-2, #DB2777)); opacity: 0.9; }
.bento-card .card-icon { width: 40px; height: 40px; border-radius: 10px; background: linear-gradient(135deg, var(--brand-1, #F97316), var(--brand-2, #DB2777)); display: flex; align-items: center; justify-content: center; color: #fff; margin-bottom: 18px; }
.bento-card .card-icon svg { width: 20px; height: 20px; }
.bento-card .stat-big { display: block; font-family: var(--font-mono); font-size: 2.4rem; font-weight: 600; color: var(--brand-1, #F97316); line-height: 1; margin-bottom: 12px; letter-spacing: -0.02em; }
@media (max-width: 640px) { .bento-card { grid-column: auto !important; } }

.tools-v3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 900px) { .tools-v3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .tools-v3 { grid-template-columns: 1fr; } }
.tool-v3 { position: relative; display: flex; flex-direction: column; padding: 28px; background: #fff; border: 1px solid var(--line); border-radius: 16px; text-decoration: none; color: inherit; transition: all .25s var(--ease); min-height: 240px; transform-style: preserve-3d; }
@media (max-width: 480px) { .tool-v3 { padding: 20px; min-height: 200px; } .tool-v3 h3 { font-size: 1.2rem; } }
.tool-v3::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--tool-edge, linear-gradient(90deg, #F97316, #DB2777)); border-radius: 16px 16px 0 0; }
.tool-v3::after { content: ""; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: linear-gradient(135deg, transparent 30%, rgba(255,255,255,.06) 50%, transparent 70%); transform: translateX(-100%); transition: transform .6s var(--ease); pointer-events: none; border-radius: 16px; }
.tool-v3:hover { text-decoration: none; transform: translateY(-4px) rotateX(1.5deg); box-shadow: 0 24px 50px -20px rgba(15,15,30,.22); border-color: transparent; }
.tool-v3:hover::after { transform: translateX(100%); }
.tool-v3 .tool-icon { width: 44px; height: 44px; border-radius: 11px; background: var(--tool-tint, rgba(249,115,22,.1)); color: var(--tool-color, #F97316); display: flex; align-items: center; justify-content: center; margin-bottom: 18px; }
.tool-v3 .tool-icon svg { width: 22px; height: 22px; }
.tool-v3 h3 { font-family: var(--font-display); font-size: 1.4rem; line-height: 1.2; letter-spacing: -0.015em; font-weight: 500; margin: 0 0 8px; color: var(--ink); }
.tool-v3 p { font-size: 15px; line-height: 1.5; color: var(--ink-soft); margin: 0 0 18px; flex: 1; }
.tool-v3 .arrow { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 500; color: var(--tool-color, #F97316); }
.tool-v3 .arrow svg { transition: transform .25s var(--ease); }
.tool-v3:hover .arrow svg { transform: translateX(4px); }
.faq-v3 { max-width: 760px; margin: 0 auto; }
.faq-v3 details { border-bottom: 1px solid var(--line); }
.faq-v3 summary { list-style: none; cursor: pointer; padding: 24px 0; display: flex; justify-content: space-between; align-items: center; gap: 24px; font-family: var(--font-display); font-size: 1.2rem; line-height: 1.3; letter-spacing: -0.01em; font-weight: 500; color: var(--ink); transition: color .15s var(--ease); }
@media (max-width: 480px) { .faq-v3 summary { font-size: 1.05rem; padding: 18px 0; gap: 12px; } .faq-v3 .answer { font-size: 14px; padding-bottom: 18px; } }
.faq-v3 summary::-webkit-details-marker { display: none; }
.faq-v3 summary:hover { color: var(--brand-1, #F97316); }
.faq-v3 summary .sign { width: 28px; height: 28px; flex-shrink: 0; position: relative; border: 1px solid var(--line); border-radius: 50%; transition: all .2s var(--ease); }
.faq-v3 summary .sign::before, .faq-v3 summary .sign::after { content: ""; position: absolute; background: var(--ink); transition: transform .25s var(--ease); }
.faq-v3 summary .sign::before { top: 50%; left: 7px; right: 7px; height: 1.5px; transform: translateY(-50%); }
.faq-v3 summary .sign::after { left: 50%; top: 7px; bottom: 7px; width: 1.5px; transform: translateX(-50%); }
.faq-v3 details[open] summary .sign::after { transform: translateX(-50%) scaleY(0); }
.faq-v3 details[open] summary .sign { background: var(--brand-1, #F97316); border-color: var(--brand-1, #F97316); }
.faq-v3 details[open] summary .sign::before { background: #fff; }
.faq-v3 .answer { padding: 0 0 24px; font-size: 15px; line-height: 1.65; color: var(--ink-soft); max-width: 64ch; }
.home-section.dark .faq-v3 summary { color: #fff; }
.home-section.dark .faq-v3 summary .sign { border-color: rgba(255,255,255,.2); }
.home-section.dark .faq-v3 summary .sign::before { background: #fff; }
.home-section.dark .faq-v3 details { border-color: rgba(255,255,255,.1); }
.home-section.dark .faq-v3 .answer { color: rgba(255,255,255,.7); }

.faq-animate { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .3s var(--ease); }
.faq-animate > * { overflow: hidden; }
details[open] .faq-animate { grid-template-rows: 1fr; }

.trust-strip { display: flex; gap: 28px; flex-wrap: wrap; align-items: center; justify-content: center; padding: 32px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); font-family: var(--font-mono); font-size: 12px; color: var(--ink-soft); letter-spacing: 0.04em; }
@media (max-width: 480px) { .trust-strip { gap: 16px; padding: 24px 0; font-size: 11px; } }
.trust-strip span { display: inline-flex; align-items: center; gap: 8px; }
.trust-strip .check { color: var(--brand-1, #F97316); }

.site-footer { border-top: 1px solid var(--line); margin-top: 0; padding: var(--s-8) 0 var(--s-6); background: var(--surface-soft); }
body.home .site-footer, body.tool-calc .site-footer { background: #0B0B0F; color: rgba(255,255,255,.6); border-top: 1px solid rgba(255,255,255,.08); }
.footer-grid { max-width: var(--max-w); margin: 0 auto; padding: 0 24px var(--s-7); display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--s-7); }
@media (max-width: 720px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--s-5); } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-brand .logo { margin-bottom: var(--s-3); color: var(--ink); }
body.home .footer-brand .logo, body.tool-calc .footer-brand .logo { color: #fff; }
.footer-brand p { font-size: 14px; color: var(--ink-soft); margin: 0; max-width: 32ch; line-height: 1.55; }
.footer-col h4 { font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-soft); margin: 0 0 var(--s-4); font-weight: 500; }
body.home .footer-col h4, body.tool-calc .footer-col h4 { color: rgba(255,255,255,.45); }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { font-size: 14px; color: var(--ink); text-decoration: none; }
.footer-col a:hover { color: var(--accent); text-decoration: underline; text-decoration-color: var(--line); }
body.home .footer-col a, body.tool-calc .footer-col a { color: rgba(255,255,255,.85); }
body.home .footer-col a:hover, body.tool-calc .footer-col a:hover { color: #fff; }
.copyright { max-width: var(--max-w); margin: 0 auto; padding: var(--s-5) 24px 0; border-top: 1px solid var(--line); font-size: 13px; color: var(--ink-soft); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
body.home .copyright, body.tool-calc .copyright { border-top: 1px solid rgba(255,255,255,.08); color: rgba(255,255,255,.5); }
.copyright .links { display: flex; gap: 16px; }
.copyright .links a { color: var(--ink-soft); }
.copyright .links a:hover { color: var(--ink); }
body.home .copyright .links a, body.tool-calc .copyright .links a { color: rgba(255,255,255,.5); }
body.home .copyright .links a:hover, body.tool-calc .copyright .links a:hover { color: #fff; }

.kbd { display: inline-flex; align-items: center; justify-content: center; min-width: 22px; height: 22px; padding: 0 6px; font-family: var(--font-mono); font-size: .72rem; font-weight: 500; color: #fff; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.18); border-bottom-width: 2px; border-radius: 4px; vertical-align: middle; line-height: 1; }

.hero-stats { display: flex; flex-wrap: wrap; gap: 36px; margin: 40px auto 0; padding: 24px 28px; background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.08); border-radius: 12px; max-width: 880px; font-family: var(--font-mono); backdrop-filter: blur(8px); }
@media (max-width: 640px) { .hero-stats { gap: 24px; padding: 20px; margin: 28px auto 0; } }
.hero-stat { flex: 1; min-width: 120px; }
.hero-stat .n { font-size: 1.6rem; font-weight: 600; color: #fff; display: block; line-height: 1.1; letter-spacing: -0.02em; }
.hero-stat .n .unit { font-size: .8rem; color: rgba(255,255,255,.55); margin-left: 2px; }
.hero-stat .n .accent { color: var(--brand-1, #F97316); }
.hero-stat .l { font-size: .7rem; color: rgba(255,255,255,.55); letter-spacing: .1em; text-transform: uppercase; margin-top: 6px; display: block; }
@media (max-width: 480px) { .hero-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; } }

.demo-tabs-bar { display: flex; align-items: center; background: rgba(0,0,0,.35); border-bottom: 1px solid rgba(255,255,255,.08); padding: 0 16px; gap: 4px; overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
.demo-tabs-bar::-webkit-scrollbar { display: none; }
@media (max-width: 480px) { .demo-tabs-bar { padding: 0 10px; } .demo-tab { padding: 12px 10px; font-size: 12px; } .demo-tabs-bar .demo-traffic { padding: 10px 10px 10px 0; } .demo-pill { padding: 10px 10px; font-size: 10px; } }
.demo-tabs-bar .demo-traffic { display: flex; gap: 6px; padding: 12px 16px 12px 0; margin-right: 4px; border-right: 1px solid rgba(255,255,255,.08); }
.demo-tabs-bar .demo-traffic span { width: 11px; height: 11px; border-radius: 50%; }
.demo-tabs-bar .demo-traffic span:nth-child(1) { background: #FF5F57; }
.demo-tabs-bar .demo-traffic span:nth-child(2) { background: #FEBC2E; }
.demo-tabs-bar .demo-traffic span:nth-child(3) { background: #28C840; }
.demo-tab { display: inline-flex; align-items: center; gap: 8px; padding: 14px 16px; background: transparent; border: 0; border-bottom: 2px solid transparent; font-family: var(--font-mono); font-size: 13px; color: rgba(255,255,255,.6); cursor: pointer; white-space: nowrap; transition: color .12s var(--ease), border-color .12s var(--ease); }
.demo-tab:hover { color: rgba(255,255,255,.9); }
.demo-tab.is-active { color: #fff; border-bottom-color: var(--brand-1, #F97316); }
.demo-tab .demo-tab-kbd { color: rgba(255,255,255,.35); margin-left: 4px; font-size: 11px; }
.demo-tabpanel { display: none; }
.demo-tabpanel.is-active { display: block; animation: tabfade .25s var(--ease); }
.demo-tabpanel[hidden] { display: none !important; }
.demo-pill { display: inline-flex; align-items: center; gap: 6px; padding: 3px 8px; background: rgba(74,222,128,.12); border: 1px solid rgba(74,222,128,.3); color: #4ADE80; border-radius: 9999px; font-family: var(--font-mono); font-size: 11px; margin-left: auto; padding: 12px 16px; }
.demo-pill::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: #4ADE80; box-shadow: 0 0 6px #4ADE80; animation: pulse 1.6s ease-in-out infinite; }
.tok-str { color: #FFD1A8; } .tok-num { color: #60A5FA; } .tok-key { color: #C084FC; } .tok-com { color: rgba(255,255,255,.4); font-style: italic; } .tok-bool { color: #F472B6; } .tok-pun { color: rgba(255,255,255,.6); } .tok-fn { color: #FBBF24; } .tok-ok { color: #4ADE80; font-weight: 600; }
body.tool-calc { --bg: #0B0B0F; --ink: #111114; --ink-soft: #9B9BAA; --ink-dim: #9B9BAA; --line: rgba(255,255,255,.1); --line-soft: rgba(255,255,255,.06); --accent: #F97316; --accent-2: #DB2777; --hero-glow-1: #FF7A45; --hero-glow-2: #FF4D8D; --hero-glow-3: #8B5CF6; --hero-glow-4: #1E1B4B; background: linear-gradient(180deg, #0B0B0F 0%, #14121E 60%, #0B0B0F 100%); color: #fff; }
body.tool-calc main.tool-calc { position: relative; padding: 96px 0 64px; color: #fff; isolation: isolate; overflow: hidden; }
body.tool-calc main.tool-calc::before { content: ""; position: absolute; inset: 0; z-index: -2; background: radial-gradient(80% 60% at 50% 0%, var(--hero-glow-1,#FF7A45) 0%, transparent 60%), radial-gradient(60% 50% at 15% 30%, var(--hero-glow-2,#FF4D8D) 0%, transparent 55%), radial-gradient(70% 60% at 90% 40%, var(--hero-glow-3,#8B5CF6) 0%, transparent 60%), radial-gradient(80% 50% at 50% 100%, var(--hero-glow-4,#1E1B4B) 0%, transparent 70%), linear-gradient(180deg, #0B0B0F 0%, #14121E 60%, #0B0B0F 100%); pointer-events: none; background-size: 200% 200%; animation: heroFloat 20s ease-in-out infinite; }
body.tool-calc main.tool-calc > .container { position: relative; }
body.tool-calc .tool-header { max-width: 880px; margin: 0 auto 28px; text-align: left; }
body.tool-calc .tool-header .eyebrow { display: inline-flex; align-items: center; gap: 8px; padding: 7px 14px 7px 8px; border-radius: 9999px; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.15); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); font-family: var(--font-mono); font-size: 12px; font-weight: 500; color: #fff; letter-spacing: 0.02em; margin-bottom: 18px; }
body.tool-calc .tool-header .eyebrow .dot { width: 8px; height: 8px; border-radius: 50%; background: #4ADE80; box-shadow: 0 0 12px #4ADE80; }
body.tool-calc .tool-header h1 { font-family: var(--font-display); font-size: clamp(2rem, 4.6vw, 3.2rem); line-height: 1.08; letter-spacing: -0.025em; font-weight: 500; margin: 0 0 12px; color: #fff; }
body.tool-calc .tool-header .subtitle { color: rgba(255,255,255,.78); font-size: clamp(1rem, 1.5vw, 1.15rem); line-height: 1.55; max-width: 68ch; margin: 0; }
body.tool-calc .tool-title { font-family: var(--font-display); font-size: clamp(1.8rem, 4vw, 2.8rem); line-height: 1.1; letter-spacing: -0.02em; font-weight: 500; margin: 0 0 24px; color: #fff; max-width: 880px; }
body.tool-calc .calc-inputs h2, body.tool-calc .calc-results h2 { font-family: var(--font-body); font-size: 1.15rem; letter-spacing: -0.01em; font-weight: 600; margin: 0 0 var(--s-4); color: #fff; }
body.tool-calc .form-row { margin-bottom: 16px; }
body.tool-calc .form-row label { display: block; font-family: var(--font-mono); font-size: 11px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.08em; color: rgba(255,255,255,.85); margin-bottom: 6px; }
body.tool-calc .form-row input, body.tool-calc .form-row select { width: 100%; padding: 10px 14px; border: 1px solid rgba(255,255,255,.12); border-radius: 10px; background: rgba(0,0,0,.45); color: #fff; font-family: var(--font-mono); font-size: 15px; min-height: 48px; box-shadow: inset 0 1px 2px rgba(0,0,0,.3); transition: border-color .15s var(--ease), box-shadow .15s var(--ease); -webkit-appearance: none; -moz-appearance: none; appearance: none; }
body.tool-calc .form-row input::placeholder { color: rgba(255,255,255,.4); }
body.tool-calc .form-row input:focus, body.tool-calc .form-row select:focus { outline: none; border-color: var(--brand-1, #F97316); box-shadow: 0 0 0 3px rgba(249,115,22,.2); }
body.tool-calc .form-row select { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none'%3E%3Cpath d='M1 1L6 6L11 1' stroke='%23ffffff80' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; padding-right: 36px; }
body.tool-calc .form-row select option { background: #1a1a2e; color: #fff; }
body.tool-calc .form-row .hint { margin-top: 6px; color: rgba(255,255,255,.45); font-size: 13px; line-height: 1.45; }
body.tool-calc .calc-field input, body.tool-calc .calc-field select { width: 100%; padding: 10px 14px; border: 1px solid rgba(255,255,255,.12); border-radius: 10px; background: rgba(0,0,0,.45); color: #fff; font-family: var(--font-mono); font-size: 15px; min-height: 48px; box-shadow: inset 0 1px 2px rgba(0,0,0,.3); transition: border-color .15s var(--ease), box-shadow .15s var(--ease); -webkit-appearance: none; -moz-appearance: none; appearance: none; }
body.tool-calc .calc-field input:focus, body.tool-calc .calc-field select:focus { outline: none; border-color: var(--brand-1, #F97316); box-shadow: 0 0 0 3px rgba(249,115,22,.2); }
body.tool-calc .calc-field select { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none'%3E%3Cpath d='M1 1L6 6L11 1' stroke='%23ffffff80' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; padding-right: 36px; }
body.tool-calc .calc-field select option { background: #1a1a2e; color: #fff; }
body.tool-calc .calc-field .hint { margin-top: 6px; color: rgba(255,255,255,.45); font-size: 13px; line-height: 1.45; }
body.tool-calc .calc-result-row span { color: rgba(255,255,255,.8); }
body.tool-calc .result-row { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 12px 0; border-bottom: 1px dashed rgba(255,255,255,.1); font-size: 15px; }
body.tool-calc .result-row:last-child { border-bottom: 0; }
body.tool-calc .result-row .label { color: rgba(255,255,255,.8); }
body.tool-calc .result-row .value { font-family: var(--font-mono); font-weight: 500; color: #fff; text-align: right; }
body.tool-calc .result-row.negative .value { color: #FF6B7A; }
body.tool-calc .result-row.highlight { margin-top: 12px; padding: 18px 20px; border-radius: 12px; background: linear-gradient(135deg, rgba(249,115,22,.2), rgba(219,39,119,.2)); border: 1px solid rgba(249,115,22,.4); color: #fff; }
body.tool-calc .result-row.highlight .label { color: #FFD1A8; font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; }
body.tool-calc .result-row.highlight .value { color: #fff; font-size: 20px; font-weight: 600; }
@media (max-width: 480px) { body.tool-calc .result-row.highlight .value { font-size: 18px; } body.tool-calc .calc-result-row.highlight .val { font-size: 18px; } }
body.tool-calc .features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: var(--s-5); }
@media (max-width: 900px) { body.tool-calc .features { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { body.tool-calc .features { grid-template-columns: 1fr; } }
body.tool-calc .feature { padding: 20px; border: 1px solid rgba(255,255,255,.1); border-radius: 14px; background: rgba(255,255,255,.04); transition: transform .2s var(--ease), box-shadow .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease); }
body.tool-calc .feature:hover { transform: translateY(-2px); box-shadow: 0 18px 40px -18px rgba(0,0,0,.5); border-color: rgba(249,115,22,.3); background: rgba(255,255,255,.06); }
body.tool-calc .feature .icon { font-family: var(--font-mono); font-size: 12px; font-weight: 600; color: var(--brand-1, #F97316); background: rgba(249,115,22,.12); padding: 6px 10px; border-radius: 9999px; display: inline-block; margin-bottom: 12px; }
body.tool-calc .feature h3 { font-family: var(--font-body); font-size: 1.15rem; letter-spacing: -0.01em; font-weight: 600; margin: 0 0 8px; color: #fff; }
body.tool-calc .feature p { color: rgba(255,255,255,.7); font-size: 14px; line-height: 1.55; margin: 0; }
body.tool-calc .faq details { border-bottom: 1px solid rgba(255,255,255,.1); }
body.tool-calc .faq summary { color: #fff; }
body.tool-calc .faq summary:hover { color: var(--brand-1, #F97316); }
body.tool-calc .faq summary .sign { border-color: rgba(255,255,255,.2); }
body.tool-calc .faq summary .sign::before, body.tool-calc .faq summary .sign::after { background: #fff; }
body.tool-calc .faq details[open] summary .sign { border-color: var(--brand-1, #F97316); background: var(--brand-1, #F97316); }
body.tool-calc .faq details[open] summary .sign::before, body.tool-calc .faq details[open] summary .sign::after { background: #fff; }
body.tool-calc .faq details[open] summary { color: var(--brand-1, #F97316); }
body.tool-calc .faq p { color: rgba(255,255,255,.7); }
body.tool-calc .source-note { color: rgba(255,255,255,.4); }
body.tool-calc .section-lede { color: rgba(255,255,255,.7); }
body.tool-calc .section-header h2 { color: #fff; }
body.tool-calc .section-tag { color: rgba(255,255,255,.4); }
body.tool-calc .eyebrow { display: inline-flex; align-items: center; gap: 8px; padding: 7px 14px 7px 8px; border-radius: 9999px; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.15); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); font-family: var(--font-mono); font-size: 12px; font-weight: 500; color: #fff; letter-spacing: 0.02em; margin-bottom: 18px; }
body.tool-calc .eyebrow .dot { width: 8px; height: 8px; border-radius: 50%; background: #4ADE80; box-shadow: 0 0 12px #4ADE80; }
@media (max-width: 720px) { body.tool-calc main.tool-calc { padding: 72px 0 48px; } body.tool-calc .calc-inputs, body.tool-calc .calc-results { padding: 20px; } body.tool-calc .tool-header h1 { font-size: clamp(1.6rem, 5vw, 2.2rem); } }
@media (max-width: 480px) { body.tool-calc .calc-inputs, body.tool-calc .calc-results { padding: 16px; } }
.calc-page { padding-top: var(--s-7); padding-bottom: var(--s-8); }
.calc-page > .eyebrow { margin-bottom: var(--s-3); }
.calc-page h1 { font-family: var(--font-display); font-size: clamp(2rem, 4.6vw, 3.2rem); line-height: 1.08; letter-spacing: -0.025em; font-weight: 500; margin: 0 0 12px; }
.calc-page .subtitle { color: var(--ink-soft); font-size: clamp(1rem, 1.5vw, 1.15rem); line-height: 1.55; max-width: 68ch; margin: 0 0 var(--s-6); }
.calc-layout { display: grid; grid-template-columns: 1fr; gap: var(--s-5); }
@media (min-width: 860px) { .calc-layout { grid-template-columns: 1fr 1fr; align-items: start; } }
.calc-card { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 22px; box-shadow: 0 1px 2px rgba(15,15,30,.04); }
.calc-card h2 { font-family: var(--font-display); font-size: 1.35rem; letter-spacing: -0.015em; font-weight: 500; margin: 0 0 var(--s-4); }
.form-row { margin-bottom: 16px; }
.form-row label { display: block; font-family: var(--font-mono); font-size: 11px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-soft); margin-bottom: 6px; }
.form-row input, .form-row select { width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--ink); font-family: var(--font-mono); font-size: 15px; transition: border-color .15s var(--ease), box-shadow .15s var(--ease); }
.form-row input:focus, .form-row select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(15,15,30,.08); }
.form-row .hint { margin-top: 6px; color: var(--ink-dim); font-size: 13px; line-height: 1.45; }
.result-row { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--line-soft); font-size: 15px; }
.result-row:last-child { border-bottom: 0; }
.result-row .label { color: var(--ink-soft); }
.result-row .value { font-family: var(--font-mono); font-weight: 500; color: var(--ink); text-align: right; }
.result-row.negative .value { color: #C0263A; }
.result-row.highlight { margin-top: 10px; padding: 16px 18px; border-radius: 14px; background: linear-gradient(135deg, rgba(17,17,20,.92), rgba(45,35,60,.92)); border: 1px solid rgba(255,255,255,.08); color: #fff; }
.result-row.highlight .label { color: rgba(255,255,255,.75); font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; }
.result-row.highlight .value { color: #fff; font-size: 20px; font-weight: 600; }
@media (max-width: 480px) { .result-row.highlight .value { font-size: 18px; } }
.section-header { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; margin-bottom: var(--s-4); }
.section-header h2 { font-family: var(--font-display); font-size: 1.6rem; letter-spacing: -0.015em; font-weight: 500; margin: 0; }
.section-tag { font-family: var(--font-mono); font-size: 12px; color: var(--ink-dim); letter-spacing: 0.06em; white-space: nowrap; }
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: var(--s-5); }
@media (max-width: 900px) { .features { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .features { grid-template-columns: 1fr; } }
.feature { padding: 18px; border: 1px solid var(--line-soft); border-radius: 14px; background: var(--surface); transition: transform .2s var(--ease), box-shadow .2s var(--ease), border-color .2s var(--ease); }
.feature:hover { transform: translateY(-2px); box-shadow: 0 18px 40px -18px rgba(15,15,30,.18); border-color: transparent; }
.feature .icon { font-family: var(--font-mono); font-size: 12px; font-weight: 600; color: var(--brand-1, #111114); background: var(--surface-soft); padding: 6px 10px; border-radius: 9999px; display: inline-block; margin-bottom: 12px; }
.feature h3 { font-family: var(--font-display); font-size: 1.15rem; letter-spacing: -0.01em; font-weight: 500; margin: 0 0 8px; }
.feature p { color: var(--ink-soft); font-size: 14px; line-height: 1.55; margin: 0; }
.faq { max-width: 760px; margin-top: var(--s-6); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { list-style: none; cursor: pointer; padding: 22px 0; display: flex; justify-content: space-between; align-items: center; gap: 24px; font-family: var(--font-display); font-size: 1.15rem; line-height: 1.3; letter-spacing: -0.01em; font-weight: 500; color: var(--ink); transition: color .15s var(--ease); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--brand-1, #111114); }
.faq summary .sign { width: 24px; height: 24px; border-radius: 50%; border: 1px solid var(--line); position: relative; flex-shrink: 0; }
.faq summary .sign::before, .faq summary .sign::after { content: ""; position: absolute; top: 50%; left: 50%; background: var(--ink); transform: translate(-50%, -50%); transition: transform .2s var(--ease); }
.faq summary .sign::before { width: 10px; height: 2px; }
.faq summary .sign::after { width: 2px; height: 10px; }
.faq details[open] summary .sign::after { transform: translate(-50%, -50%) rotate(90deg); }
.faq details[open] summary .sign { border-color: var(--brand-1, #111114); }
.faq details[open] summary { color: var(--brand-1, #111114); }
.faq p { padding: 0 0 22px; color: var(--ink-soft); line-height: 1.6; }
.source-note { color: var(--ink-dim); font-size: .78rem; font-family: var(--font-mono); margin-top: var(--s-4); line-height: 1.5; }
.section-lede { color: var(--ink-soft); max-width: 65ch; line-height: 1.6; margin: 0 0 var(--s-5); }

.calc-results-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--s-2); }
.calc-results-title { font-family: var(--font-mono); font-size: 11px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.1em; color: rgba(255,255,255,.6); }
.copy-results-btn { font-family: var(--font-mono); font-size: 12px; font-weight: 500; color: rgba(255,255,255,.85); background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.16); border-radius: 8px; padding: 6px 12px; cursor: pointer; transition: background .15s var(--ease), border-color .15s var(--ease), transform .12s var(--ease); }
.copy-results-btn:hover { background: rgba(255,255,255,.1); border-color: var(--brand-1, #F97316); }
.copy-results-btn:focus-visible { outline: 2px solid var(--brand-1, #F97316); outline-offset: 2px; }
.copy-results-btn.copied { color: #4ADE80; border-color: #4ADE80; background: rgba(74,222,128,.08); }

.nextstep { max-width: 880px; margin: var(--s-6) auto 0; }
.nextstep-head { font-family: var(--font-mono); font-size: 12px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.1em; color: rgba(255,255,255,.6); margin-bottom: var(--s-3); }
.nextstep-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-3); }
.nextstep-card { position: relative; display: block; padding: var(--s-4); background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.1); border-radius: 12px; text-decoration: none; color: #fff; transition: border-color .2s var(--ease), background .2s var(--ease), transform .2s var(--ease), box-shadow .2s var(--ease); }
.nextstep-card:hover { background: rgba(255,255,255,.07); border-color: var(--brand-1, #F97316); transform: translateY(-2px); box-shadow: 0 12px 30px -12px rgba(0,0,0,.5); text-decoration: none; color: #fff; }
.nextstep-name { display: block; font-family: var(--font-display); font-size: 1.05rem; font-weight: 500; color: #fff; margin-bottom: 4px; padding-right: 22px; letter-spacing: -0.01em; }
.nextstep-desc { display: block; font-size: 13px; color: rgba(255,255,255,.7); line-height: 1.45; }
.nextstep-arrow { position: absolute; top: var(--s-4); right: var(--s-4); color: rgba(255,255,255,.4); transition: color .2s var(--ease), transform .2s var(--ease); }
.nextstep-card:hover .nextstep-arrow { color: var(--brand-1, #F97316); transform: translateX(3px); }
.nextstep-card:focus-visible { outline: 2px solid var(--brand-1, #F97316); outline-offset: 2px; }
@media (max-width: 720px) { .nextstep-grid { grid-template-columns: 1fr; } }

.subscribe-form { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.subscribe-form input[type=email] { flex: 1; min-width: 220px; padding: 12px 16px; background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.16); border-radius: 10px; font-family: var(--font-mono); font-size: 15px; color: #fff; transition: border-color .15s var(--ease), box-shadow .15s var(--ease); }
.subscribe-form input[type=email]::placeholder { color: rgba(255,255,255,.4); }
.subscribe-form input[type=email]:focus { outline: none; border-color: var(--brand-1, #F97316); box-shadow: 0 0 0 3px rgba(249,115,22,.2); }
.subscribe-form .btn { flex-shrink: 0; }
.subscribe-done { font-family: var(--font-mono); font-size: 14px; color: #4ADE80; display: none; margin-top: 16px; }
.subscribe-wrap.done .subscribe-form { display: none; }
.subscribe-wrap.done .subscribe-done { display: block; }
.subscribe-inline { max-width: 880px; margin: var(--s-5) auto 0; padding: var(--s-4) var(--s-5); background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.1); border-radius: 12px; }
.subscribe-inline .si-label { font-family: var(--font-mono); font-size: 13px; color: rgba(255,255,255,.75); margin: 0 0 10px; }
.subscribe-inline .subscribe-form { margin: 0; max-width: none; justify-content: flex-start; }
.subscribe-inline .subscribe-form input[type=email] { min-width: 180px; }
.subscribe-inline .subscribe-done { margin-top: 10px; }

[data-reveal] { opacity: 0; transform: translateY(12px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
[data-reveal].is-visible { opacity: 1; transform: translateY(0); }

@media print { body { background: #fff; color: #000; } .site-header, .site-footer, .skip-link, .cta-row { display: none; } a { color: #000; text-decoration: underline; } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
  [data-reveal] { opacity: 1; transform: none; }
  .bento-card { opacity: 1; animation: none; }
  .hero-v3 .hero-eyebrow, .hero-v3 .hero-title, .hero-v3 .hero-lede, .hero-v3 .hero-cta-row, .hero-v3 .calc-window, .hero-v3 .hero-stats, .hero-v3 .hero-meta { opacity: 1; animation: none; }
}
:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; border-radius: 2px; }
body.home :focus-visible, body.tool-calc :focus-visible { outline-color: #fff; }

/* Blog article mobile typography */
article h1 { font-family: var(--font-display); font-size: clamp(1.6rem, 4vw, 2.4rem); line-height: 1.15; letter-spacing: -0.02em; font-weight: 500; }
article h2 { font-family: var(--font-display); font-size: clamp(1.25rem, 2.8vw, 1.6rem); line-height: 1.2; letter-spacing: -0.015em; font-weight: 500; }
article p { font-size: clamp(0.95rem, 1.4vw, 1.05rem); line-height: 1.7; }
article li { font-size: clamp(0.92rem, 1.3vw, 1rem); line-height: 1.65; }
article ul, article ol { padding-left: 1.2em; }
article blockquote { font-size: clamp(1rem, 1.8vw, 1.15rem); padding: 12px 20px; }
@media (max-width: 480px) {
  article { font-size: 15px; }
  article h1 { font-size: 1.5rem; }
  article h2 { font-size: 1.2rem; margin-top: 28px; }
  article p { font-size: 15px; line-height: 1.65; }
  article ul, article ol { padding-left: 1.1em; }
  article pre { font-size: 13px; padding: 14px; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  article img { width: 100%; height: auto; }
}
.calc-workspace { grid-column: 1 / -1; padding: 14px 28px 10px; border-bottom: 1px solid rgba(255,255,255,.08); background: rgba(255,255,255,.02); }
.workspace-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 8px; }
.workspace-title { font-family: var(--font-mono); font-size: 11px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.1em; color: rgba(255,255,255,.6); }
.workspace-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.workspace-actions input { width: 160px; padding: 6px 10px; background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.16); border-radius: 8px; font-family: var(--font-mono); font-size: 12px; color: #fff; }
.workspace-actions input::placeholder { color: rgba(255,255,255,.4); }
.workspace-actions input:focus { outline: none; border-color: var(--brand-1, #F97316); }
.workspace-list { display: flex; flex-wrap: wrap; gap: 8px; }
.ws-card { display: inline-flex; align-items: center; gap: 8px; max-width: 260px; padding: 6px 10px; background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.14); border-radius: 8px; color: #fff; cursor: pointer; font-family: var(--font-mono); font-size: 12px; transition: border-color .15s var(--ease), background .15s var(--ease); }
.ws-card:hover { background: rgba(255,255,255,.1); border-color: var(--brand-1, #F97316); }
.ws-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ws-del { color: rgba(255,255,255,.5); font-size: 14px; line-height: 1; padding: 0 2px; }
.ws-del:hover { color: #F87171; }
.ws-empty { font-family: var(--font-mono); font-size: 12px; color: rgba(255,255,255,.4); padding: 2px 0; }
@media (max-width: 720px) { .calc-workspace { padding: 12px 16px 8px; } .workspace-actions input { width: 100%; } }

/* Language toggle button */
.lang-toggle {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.8);
  font-family: var(--font-body, 'Geist', sans-serif);
  font-size: 12px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 6px;
  cursor: pointer;
  margin-left: 12px;
  transition: all 0.2s ease;
  white-space: nowrap;
}
.lang-toggle:hover {
  background: rgba(255,255,255,0.15);
  color: #fff;
  border-color: rgba(255,255,255,0.25);
}
@media (max-width: 640px) { .main-nav { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; } .main-nav::-webkit-scrollbar { display: none; } .main-nav a { white-space: nowrap; } }

/* Adsterra ad slots */
.adsterra-slot { width: 100%; max-width: 100%; margin: 32px auto; text-align: center; }
.adsterra-slot--top { margin-top: 0; }
.adsterra-slot--bottom { margin-bottom: 0; }
.adsterra-banner { max-width: 100%; overflow-x: auto; margin: 0 auto 24px; -webkit-overflow-scrolling: touch; }
.adsterra-native { max-width: 100%; margin: 0 auto; }