/* ---- reset ------------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
img,svg{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}

/* ---- tokens ------------------------------------------------------------ */
:root{
  --bg:#ffffff;
  --surface:#ffffff;
  --surface-sunken:#f6f7fb;
  --surface-tint:#f3f2ff;

  --ink:#0a0a1a;
  --body:#3a4256;
  --muted:#6e7688;
  --faint:#9aa1b3;

  --line:#ececf4;
  --line-strong:#dcdcea;

  --accent:#5b4bff;
  --accent-2:#8b5cf6;
  --accent-hover:#4a3ae0;
  --accent-wash:#efecff;
  --accent-line:#ddd6ff;

  /* the bold gradient system */
  --grad:linear-gradient(120deg,#6d4bff 0%,#9b5cff 55%,#d857c8 100%);
  --grad-vivid:linear-gradient(120deg,#5b3bff 0%,#8b3bff 50%,#e0459e 100%);
  --grad-soft:linear-gradient(135deg,#f1edff 0%,#fbeeffb0 100%);
  --hero-bg:#0c0a1e;                       /* deep base under the hero gradient */
  --dark:#0c0a1e;
  --dark-2:#171334;

  --ok:#12b981;
  --ok-wash:#e6f8f1;
  --warn:#e2620a;

  --radius:12px;
  --radius-lg:18px;
  --radius-xl:26px;

  --shadow-sm:0 1px 2px rgba(12,10,30,.06);
  --shadow:0 4px 12px rgba(12,10,30,.06),0 18px 40px -18px rgba(12,10,30,.20);
  --shadow-lg:0 8px 20px rgba(12,10,30,.10),0 40px 80px -28px rgba(30,20,80,.45);
  --shadow-accent:0 12px 30px -8px rgba(91,75,255,.5);

  --max:1140px;
  --measure:66ch;

  --sans:'Inter','Inter var','Segoe UI',system-ui,-apple-system,'Helvetica Neue',Arial,sans-serif;
  --mono:'SF Mono','Cascadia Mono','JetBrains Mono','Roboto Mono',Consolas,monospace;
}
html[lang="ja"]{--sans:'Inter','Hiragino Kaku Gothic ProN','Yu Gothic UI','Meiryo',system-ui,sans-serif}
html[lang="th"]{--sans:'Inter','Noto Sans Thai','Leelawadee UI','Tahoma',system-ui,sans-serif}
html[lang="th"] body{line-height:1.85}

/* ---- base -------------------------------------------------------------- */
body{background:var(--bg);color:var(--body);font-family:var(--sans);font-size:17px;
  line-height:1.65;font-feature-settings:'cv02','cv03','cv04','ss01';
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
h1,h2,h3,h4{color:var(--ink);font-weight:780;letter-spacing:-.028em;line-height:1.08}
h1{font-size:clamp(2.4rem,6vw,4rem);letter-spacing:-.04em}
h2{font-size:clamp(1.7rem,3.4vw,2.5rem);margin-bottom:.5rem}
h3{font-size:1.22rem;margin-bottom:.35rem;letter-spacing:-.015em;font-weight:720}
p{max-width:var(--measure)}
a{color:var(--accent);text-decoration:none;transition:color .14s}
a:hover{color:var(--accent-hover)}
strong,b{color:var(--ink);font-weight:660}
:focus-visible{outline:2.5px solid var(--accent);outline-offset:2px;border-radius:6px}
::selection{background:rgba(91,75,255,.2)}

.wrap{max-width:var(--max);margin-inline:auto;padding-inline:24px}
.icon{width:20px;height:20px;flex:none}

.eyebrow{display:inline-flex;align-items:center;gap:9px;font-size:.78rem;font-weight:720;
  text-transform:uppercase;letter-spacing:.14em;color:var(--accent)}
.eyebrow::before{content:"";width:26px;height:2px;border-radius:2px;background:var(--grad)}

.skip{position:absolute;left:-9999px}
.skip:focus{left:24px;top:12px;z-index:100;background:var(--surface);
  border:1px solid var(--line-strong);border-radius:var(--radius);padding:10px 16px;box-shadow:var(--shadow)}

/* ---- nav --------------------------------------------------------------- */
.nav{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.85);
  backdrop-filter:saturate(1.8) blur(14px);-webkit-backdrop-filter:saturate(1.8) blur(14px);
  border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;gap:28px;height:72px}
.logo{display:flex;align-items:center;gap:11px;font-weight:800;color:var(--ink);
  font-size:1.1rem;letter-spacing:-.03em;white-space:nowrap}
.logo .logo-badge{width:36px;height:36px;border-radius:11px;display:grid;place-items:center;
  background:var(--grad);box-shadow:var(--shadow-accent);flex:none}
.logo .logo-badge .icon{width:20px;height:20px;color:#fff}
.nav-links{display:flex;gap:4px;list-style:none;margin-left:auto;align-items:center}
.nav-links a{color:var(--body);font-size:.93rem;font-weight:560;padding:9px 14px;border-radius:10px;transition:.14s}
.nav-links a:hover{color:var(--ink);background:var(--surface-sunken)}
.nav-links a[aria-current=page]{color:var(--accent);background:var(--accent-wash)}
.nav-toggle{display:none;margin-left:auto;background:var(--surface);border:1px solid var(--line-strong);
  border-radius:10px;padding:8px;cursor:pointer;color:var(--ink);box-shadow:var(--shadow-sm)}

/* ---- HERO: bold gradient band + floating tool -------------------------- */
.tool{position:relative;padding:0 0 12px}
.hero-band{position:relative;overflow:hidden;background:var(--hero-bg);
  padding:74px 0 150px;text-align:center;isolation:isolate}
.hero-band::before{content:"";position:absolute;inset:0;z-index:-2;background:
  radial-gradient(48% 55% at 18% 8%,rgba(139,92,246,.55),transparent 60%),
  radial-gradient(50% 60% at 85% 18%,rgba(216,87,200,.42),transparent 60%),
  radial-gradient(60% 70% at 50% 120%,rgba(91,75,255,.5),transparent 60%)}
.hero-band::after{content:"";position:absolute;inset:0;z-index:-1;opacity:.5;
  background-image:radial-gradient(rgba(255,255,255,.14) 1px,transparent 1px);
  background-size:26px 26px;mask-image:radial-gradient(70% 60% at 50% 40%,#000,transparent 75%);
  -webkit-mask-image:radial-gradient(70% 60% at 50% 40%,#000,transparent 75%)}
.hero-inner{max-width:800px;margin-inline:auto;position:relative}
.hero-inner .eyebrow{color:#c9bcff;justify-content:center}
.hero-inner .eyebrow::before{background:linear-gradient(90deg,#c9bcff,#e97fd8)}
.hero-band h1{color:#fff;margin:18px 0 18px;text-shadow:0 2px 40px rgba(91,75,255,.4)}
.hero-band .lead{color:#c3c0d9;font-size:clamp(1.05rem,2vw,1.28rem);line-height:1.55;
  max-width:60ch;margin-inline:auto}
.trust{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:26px}
.trust-chip{display:inline-flex;align-items:center;gap:8px;font-size:.85rem;font-weight:580;
  color:#e9e7fb;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);
  padding:8px 15px;border-radius:100px;backdrop-filter:blur(6px)}
.trust-chip .icon{width:15px;height:15px;color:#8affc9}

/* the real tool, floated up over the gradient */
.tool-wrap{margin-top:-108px;position:relative;z-index:2}
.tool-card{background:var(--surface);border:1px solid rgba(255,255,255,.5);
  border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);padding:30px;
  max-width:980px;margin-inline:auto;position:relative;overflow:hidden}
.tool-card::before{content:"";position:absolute;top:0;left:0;right:0;height:5px;background:var(--grad)}
@media(min-width:760px){.tool-card{padding:40px}}

.field{display:flex;flex-direction:column;gap:7px;margin-bottom:17px}
.field label{font-size:.85rem;font-weight:640;color:var(--ink);letter-spacing:-.01em}
.field .hint{font-size:.8rem;color:var(--muted)}
input[type=text],input[type=number],input[type=date],input[type=email],select,textarea{
  width:100%;background:var(--surface-sunken);border:1.5px solid var(--line-strong);
  border-radius:var(--radius);padding:12px 14px;font-size:1rem;color:var(--ink);
  transition:border-color .14s,box-shadow .14s,background .14s}
input::placeholder,textarea::placeholder{color:var(--faint)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent);
  background:var(--surface);box-shadow:0 0 0 4px var(--accent-wash)}
input[type=range]{width:100%;accent-color:var(--accent)}
.row{display:grid;gap:16px}
@media(min-width:640px){.row-2{grid-template-columns:1fr 1fr}.row-3{grid-template-columns:repeat(3,1fr)}}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:var(--grad);color:#fff;border:1px solid transparent;border-radius:var(--radius);
  padding:13px 24px;font-size:.98rem;font-weight:660;cursor:pointer;box-shadow:var(--shadow-accent);
  transition:transform .12s,box-shadow .12s,filter .12s}
.btn:hover{color:#fff;transform:translateY(-2px);filter:brightness(1.07);box-shadow:0 18px 40px -10px rgba(91,75,255,.6)}
.btn:active{transform:translateY(0)}
.btn-ghost{background:var(--surface);color:var(--ink);border-color:var(--line-strong);box-shadow:var(--shadow-sm)}
.btn-ghost:hover{background:var(--surface-sunken);color:var(--ink);filter:none;box-shadow:var(--shadow)}
.btn-row{display:flex;flex-wrap:wrap;gap:11px}

.result{margin-top:24px;padding:24px 26px;background:var(--grad-soft);
  border:1px solid var(--accent-line);border-radius:var(--radius-lg);position:relative;overflow:hidden}
.result::before{content:"";position:absolute;left:0;top:0;bottom:0;width:5px;background:var(--grad)}
.result-label{font-size:.76rem;font-weight:720;text-transform:uppercase;letter-spacing:.1em;color:var(--accent);margin-bottom:6px}
.result-value{font-size:2.3rem;font-weight:800;color:var(--ink);letter-spacing:-.03em;line-height:1.08;word-break:break-word}
.result-note{font-size:.88rem;color:var(--muted);margin-top:7px}
.result[hidden]{display:none}
.err{color:var(--warn);font-size:.88rem;margin-top:10px;font-weight:540}

/* ---- sections (colour-blocked) ----------------------------------------- */
section{padding:76px 0}
section.alt{background:var(--surface-sunken);border-block:1px solid var(--line)}
section.tintedgrad{background:linear-gradient(180deg,#faf9ff,#f4f1ff)}
.sec-head{max-width:var(--measure);margin-bottom:40px}
.sec-head.center{margin-inline:auto;text-align:center}
.sec-head.center .eyebrow{justify-content:center}
.sec-head h2{margin-bottom:14px}
.sec-head p{color:var(--muted);font-size:1.08rem}

.grid{display:grid;gap:22px}
@media(min-width:700px){.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}}

.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:30px;box-shadow:var(--shadow-sm);transition:transform .18s,box-shadow .18s,border-color .18s;position:relative;overflow:hidden}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--accent-line)}
.card .card-icon{width:54px;height:54px;border-radius:15px;display:grid;place-items:center;
  background:var(--grad);box-shadow:var(--shadow-accent);margin-bottom:18px}
.card .card-icon .icon{width:26px;height:26px;color:#fff}
.card h3{margin-bottom:8px}
.card p{font-size:.96rem;color:var(--body)}

.ticks{list-style:none;display:grid;gap:12px}
.ticks li{display:flex;align-items:flex-start;gap:11px;font-size:.97rem}
.ticks .tick{width:22px;height:22px;border-radius:7px;background:var(--ok-wash);display:grid;place-items:center;flex:none;margin-top:1px}
.ticks .tick .icon{color:var(--ok);width:14px;height:14px}

table{width:100%;border-collapse:separate;border-spacing:0;font-size:.94rem}
th,td{text-align:left;padding:14px 16px;border-bottom:1px solid var(--line)}
th{font-size:.75rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-weight:680;background:var(--surface-sunken)}
thead th:first-child{border-top-left-radius:var(--radius)}
thead th:last-child{border-top-right-radius:var(--radius)}
td{color:var(--body)}
tbody tr:last-child td{border-bottom:none}
tbody tr:hover td{background:var(--surface-sunken)}
.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm)}

/* steps — bold gradient numbers */
.steps{list-style:none;display:grid;gap:10px;counter-reset:s;max-width:780px}
.steps li{display:grid;grid-template-columns:auto 1fr;gap:22px;align-items:start;
  padding:22px;border-radius:var(--radius-lg);background:var(--surface);border:1px solid var(--line);
  box-shadow:var(--shadow-sm);transition:transform .16s,box-shadow .16s}
.steps li:hover{transform:translateX(4px);box-shadow:var(--shadow)}
.steps li::before{counter-increment:s;content:counter(s);width:46px;height:46px;display:grid;place-items:center;
  background:var(--grad);color:#fff;border-radius:14px;font-size:1.15rem;font-weight:800;box-shadow:var(--shadow-accent)}
.step-body{padding-top:3px}
.step-body .step-n{display:block;font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;color:var(--accent);font-weight:720;margin-bottom:4px}
.step-body p{margin:0;color:var(--body);max-width:56ch;font-size:1.02rem}

/* ---- DARK contrast band ------------------------------------------------ */
.band-dark{position:relative;overflow:hidden;background:var(--dark);color:#e9e7fb;padding:82px 0}
.band-dark::before{content:"";position:absolute;inset:0;z-index:0;background:
  radial-gradient(40% 60% at 12% 0,rgba(139,92,246,.4),transparent 60%),
  radial-gradient(45% 60% at 90% 100%,rgba(216,87,200,.34),transparent 60%)}
.band-dark>.wrap{position:relative;z-index:1}
.band-dark .eyebrow{color:#c9bcff}
.band-dark h2{color:#fff}
.band-dark .sec-head p{color:#b6b2d6}
.band-dark .dark-grid{display:grid;gap:20px;margin-top:8px}
@media(min-width:700px){.band-dark .dark-grid{grid-template-columns:repeat(3,1fr)}}
.dark-card{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);
  border-radius:var(--radius-lg);padding:28px;backdrop-filter:blur(6px)}
.dark-card .card-icon{width:50px;height:50px;border-radius:14px;display:grid;place-items:center;
  background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.16);margin-bottom:16px}
.dark-card .card-icon .icon{width:24px;height:24px;color:#c9bcff}
.dark-card h3{color:#fff;margin-bottom:7px}
.dark-card p{color:#b6b2d6;font-size:.95rem}

/* FAQ */
.faq{display:grid;gap:12px}
.faq details{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--surface);
  box-shadow:var(--shadow-sm);overflow:hidden;transition:border-color .16s,box-shadow .16s}
.faq details[open]{border-color:var(--accent-line);box-shadow:var(--shadow)}
.faq summary{cursor:pointer;padding:20px 24px;font-weight:660;color:var(--ink);list-style:none;
  display:flex;justify-content:space-between;align-items:center;gap:16px;font-size:1.02rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:'';width:11px;height:11px;flex:none;border-right:2.5px solid var(--muted);
  border-bottom:2.5px solid var(--muted);transform:rotate(45deg);transition:transform .18s;margin-top:-4px}
.faq details[open] summary::after{transform:rotate(-135deg);margin-top:3px;border-color:var(--accent)}
.faq .faq-body{padding:0 24px 22px;font-size:.98rem}
.faq .faq-body p{max-width:none;color:var(--body)}

.prose h2{margin-top:40px}
.prose h3{margin-top:26px}
.prose p,.prose ul,.prose ol{margin-bottom:16px}
.prose ul,.prose ol{padding-left:22px}
.prose li{margin-bottom:7px}
.prose table{margin:24px 0}

/* ---- dark footer ------------------------------------------------------- */
.foot{position:relative;overflow:hidden;background:var(--dark);color:#b6b2d6;padding:64px 0 44px;margin-top:0}
.foot::before{content:"";position:absolute;inset:0;background:radial-gradient(60% 100% at 50% 0,rgba(91,75,255,.22),transparent 65%)}
.foot>.wrap{position:relative}
.foot-in{display:grid;gap:34px}
@media(min-width:700px){.foot-in{grid-template-columns:1.6fr 1fr 1fr}}
.foot .logo{color:#fff;margin-bottom:8px}
.foot h4{font-size:.76rem;text-transform:uppercase;letter-spacing:.1em;color:#8f8ab0;margin-bottom:15px;font-weight:680}
.foot ul{list-style:none;display:grid;gap:11px}
.foot a{color:#c3c0d9;font-size:.93rem}
.foot a:hover{color:#fff}
.foot p{font-size:.93rem;color:#8f8ab0}
.foot-base{margin-top:38px;padding-top:24px;border-top:1px solid rgba(255,255,255,.1);
  display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;font-size:.87rem;color:#8f8ab0}

/* ---- mobile ------------------------------------------------------------ */
@media(max-width:760px){
  body{font-size:16px}
  .hero-band{padding:52px 0 130px}
  .tool-wrap{margin-top:-104px}
  .tool-card{padding:22px;border-radius:var(--radius-lg)}
  .nav-toggle{display:inline-flex}
  .nav-links{display:none;position:absolute;top:72px;left:0;right:0;flex-direction:column;gap:2px;
    background:var(--surface);border-bottom:1px solid var(--line);padding:12px 20px 18px;box-shadow:var(--shadow)}
  .nav-links.open{display:flex}.nav-links a{padding:12px 14px}
  section{padding:52px 0}.band-dark{padding:56px 0}
  .result-value{font-size:1.8rem}
  .steps li{padding:16px;gap:16px}.steps li::before{width:38px;height:38px}
}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media print{.nav,.foot,.btn,.trust,.band-dark{display:none}}