/* ==========================================================================
   ToneFixer.com — Brand Design System v2
   Positioning : Cross-cultural tone localization (B2B · Infra)
   Design tone : precise · restrained · confident · premium
   ========================================================================== */

:root{
  /* — Surfaces ——————————————————————————————————————— */
  --ink-950:#05070D;
  --ink-900:#080B14;
  --ink-850:#0A0E19;
  --ink-800:#0F1524;
  --surface:#111A2B;
  --surface-hi:#16203A;

  /* — Lines & text ——————————————————————————————————— */
  --line:rgba(255,255,255,.08);
  --line-2:rgba(255,255,255,.16);
  --txt:#EDF1F7;
  --txt-2:#A3AFC2;
  --txt-3:#6B7A90;

  /* — Brand accent (cinnabar) ———————————————————————— */
  --accent:#FF5A36;
  --accent-hi:#FF7C57;
  --accent-soft:rgba(255,90,54,.13);
  --accent-line:rgba(255,90,54,.32);
  --ok:#33C48D;

  /* — Shape & motion ————————————————————————————————— */
  --r-sm:10px;
  --r:14px;
  --r-lg:20px;
  --r-xl:28px;
  --maxw:1180px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink-900);
  color:var(--txt);
  font-family:var(--font);
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;line-height:1.15;letter-spacing:-.02em;font-weight:600}
p{margin:0}
ul{margin:0;padding:0;list-style:none}

.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* — Typography helpers ——————————————————————————————— */
.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  padding:6px 14px 6px 11px;
  border:1px solid var(--line-2);
  border-radius:999px;
  background:rgba(255,255,255,.03);
  font-size:12.5px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--txt-2);font-weight:500;
}
.eyebrow .dot{
  width:6px;height:6px;border-radius:50%;background:var(--accent);
  box-shadow:0 0 0 4px var(--accent-soft);
}
.section-label{
  font-size:12px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--accent);font-weight:600;margin-bottom:14px;
}

/* ==========================================================================
   Navigation
   ========================================================================== */
.site-nav{
  position:sticky;top:0;z-index:60;
  background:rgba(8,11,20,.72);
  backdrop-filter:saturate(180%) blur(16px);
  -webkit-backdrop-filter:saturate(180%) blur(16px);
  border-bottom:1px solid transparent;
  transition:border-color .3s var(--ease),background .3s var(--ease);
}
.site-nav.scrolled{border-bottom-color:var(--line);background:rgba(8,11,20,.9)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px;gap:24px}

.brand{display:flex;align-items:center;gap:11px;flex-shrink:0}
.brand-mark{width:32px;height:32px;flex-shrink:0}
.brand-word{font-size:19px;letter-spacing:-.028em;white-space:nowrap}
.brand-word .w-tone{font-weight:400;color:var(--txt)}
.brand-word .w-fixer{font-weight:700;color:var(--txt)}
.brand-word .w-tld{font-weight:400;color:var(--txt-3);font-size:14px;margin-left:1px}

.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{font-size:14.5px;color:var(--txt-2);transition:color .2s var(--ease)}
.nav-links a:hover{color:var(--txt)}
.nav-links .lang{
  padding-left:20px;border-left:1px solid var(--line);
  font-size:13px;color:var(--txt-3);
}
.nav-cta{display:flex;align-items:center;gap:12px}
.nav-toggle{display:none}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border-radius:var(--r-sm);
  font-size:14.5px;font-weight:600;letter-spacing:-.01em;
  border:1px solid transparent;cursor:pointer;
  transition:transform .18s var(--ease),background .2s var(--ease),
             border-color .2s var(--ease),box-shadow .25s var(--ease);
  font-family:inherit;
}
.btn:active{transform:translateY(1px)}
.btn-primary{
  background:var(--accent);color:var(--ink-950);
  box-shadow:0 6px 22px -8px rgba(255,90,54,.65);
}
.btn-primary:hover{background:var(--accent-hi);box-shadow:0 10px 30px -8px rgba(255,90,54,.8)}
.btn-ghost{background:transparent;color:var(--txt);border-color:var(--line-2)}
.btn-ghost:hover{background:rgba(255,255,255,.05);border-color:rgba(255,255,255,.28)}
.btn-sm{padding:8px 15px;font-size:13.5px}
.btn-lg{padding:14px 26px;font-size:15.5px}
.btn-block{width:100%}
.btn[disabled]{opacity:.55;cursor:not-allowed;transform:none}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero{position:relative;padding:96px 0 72px;overflow:hidden}
.hero::before{
  content:"";position:absolute;inset:-20% 0 auto 0;height:760px;
  background:radial-gradient(52% 48% at 50% 30%,rgba(255,90,54,.13),transparent 68%);
  pointer-events:none;
}
.hero-grid{
  position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(255,255,255,.045) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(70% 60% at 50% 25%,#000 20%,transparent 78%);
  -webkit-mask-image:radial-gradient(70% 60% at 50% 25%,#000 20%,transparent 78%);
}
.hero-inner{position:relative;text-align:center;max-width:860px;margin:0 auto}
.hero h1{
  margin:26px 0 22px;
  font-size:clamp(38px,5.4vw,62px);
  font-weight:650;letter-spacing:-.035em;
}
.hero h1 .grad{
  background:linear-gradient(96deg,var(--accent) 8%,#FFB08A 92%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-sub{
  font-size:clamp(16px,1.5vw,19px);color:var(--txt-2);
  max-width:640px;margin:0 auto;line-height:1.68;
}
.hero-sub strong{color:var(--txt);font-weight:550}
.hero-actions{display:flex;gap:14px;justify-content:center;margin-top:36px;flex-wrap:wrap}
.hero-note{margin-top:18px;font-size:13.5px;color:var(--txt-3)}

.trust-strip{
  position:relative;margin-top:64px;padding-top:34px;
  border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;gap:clamp(24px,5vw,56px);
  flex-wrap:wrap;
}
.trust-strip span{
  font-size:15px;font-weight:600;letter-spacing:-.01em;
  color:var(--txt-3);opacity:.85;
  transition:color .25s var(--ease),opacity .25s var(--ease);
}
.trust-strip span:hover{color:var(--txt-2);opacity:1}

/* ==========================================================================
   Sections
   ========================================================================== */
.section{position:relative;padding:96px 0}
.section.alt{background:var(--ink-850);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{max-width:680px;margin:0 auto 56px;text-align:center}
.section-title{font-size:clamp(28px,3.3vw,40px);font-weight:640;letter-spacing:-.03em}
.section-sub{margin-top:16px;font-size:17px;color:var(--txt-2);line-height:1.7}

/* ==========================================================================
   Tool
   ========================================================================== */
.tool-card{
  background:linear-gradient(180deg,var(--surface) 0%,var(--ink-800) 100%);
  border:1px solid var(--line);
  border-radius:var(--r-xl);
  box-shadow:0 40px 90px -50px rgba(0,0,0,.9);
  overflow:hidden;
}
.tool-grid{display:grid;grid-template-columns:1fr 1fr;gap:0}
.tool-pane{padding:28px}
.tool-pane+.tool-pane{border-left:1px solid var(--line)}
.pane-title{
  display:flex;align-items:center;justify-content:space-between;
  font-size:12px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--txt-3);font-weight:600;margin-bottom:14px;
}
.field{margin-bottom:16px}
.field label{
  display:block;font-size:13px;color:var(--txt-2);
  margin-bottom:7px;font-weight:500;
}
.textarea,.select,.input{
  width:100%;background:var(--ink-900);
  border:1px solid var(--line-2);border-radius:var(--r);
  color:var(--txt);font-family:inherit;font-size:15px;
  padding:13px 15px;transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.textarea{min-height:172px;resize:vertical;line-height:1.65}
.textarea:focus,.select:focus,.input:focus{
  outline:none;border-color:var(--accent-line);
  box-shadow:0 0 0 3px var(--accent-soft);
}
.textarea::placeholder,.input::placeholder{color:var(--txt-3)}
.select{appearance:none;cursor:pointer;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%236B7A90' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round' fill='none'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 15px center;padding-right:38px;
}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:12px}

.output-body{
  min-height:172px;background:var(--ink-900);
  border:1px solid var(--line);border-radius:var(--r);
  padding:16px 17px;font-size:15.5px;line-height:1.75;color:var(--txt);
  white-space:pre-wrap;word-break:break-word;
}
.output-body.empty{color:var(--txt-3);font-size:14.5px}
.why{
  margin-top:16px;padding:15px 17px;
  background:var(--accent-soft);
  border:1px solid var(--accent-line);
  border-left:3px solid var(--accent);
  border-radius:var(--r);
  font-size:14px;line-height:1.7;color:var(--txt-2);
}
.why b{display:block;color:var(--accent);font-size:11.5px;letter-spacing:.13em;
  text-transform:uppercase;margin-bottom:7px;font-weight:700}
.why:empty,.why.hidden{display:none}

.chips{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}
.chip{
  padding:4px 11px;border-radius:999px;font-size:12px;font-weight:500;
  border:1px solid var(--line-2);color:var(--txt-2);background:rgba(255,255,255,.03);
}
.chip.demo{border-color:var(--accent-line);color:var(--accent);background:var(--accent-soft)}
.status{margin-top:12px;font-size:13px;color:var(--txt-3);min-height:18px}
.status.err{color:#FF7A5C}

/* ==========================================================================
   Cards
   ========================================================================== */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-lg);padding:28px;
  transition:border-color .25s var(--ease),transform .25s var(--ease),background .25s var(--ease);
}
.card:hover{border-color:var(--line-2);transform:translateY(-3px);background:var(--surface-hi)}
.card h3{font-size:17.5px;font-weight:620;margin-bottom:11px;letter-spacing:-.02em}
.card p{font-size:14.8px;color:var(--txt-2);line-height:1.72}
.card .kicker{
  font-size:11.5px;letter-spacing:.13em;text-transform:uppercase;
  color:var(--accent);font-weight:700;margin-bottom:12px;
}
.sample{
  margin-top:16px;padding:13px 15px;background:var(--ink-900);
  border:1px solid var(--line);border-radius:var(--r-sm);
  font-size:14px;line-height:1.7;color:var(--txt-2);
}
.sample .bad{color:#FF7A5C}
.sample .good{color:var(--ok)}

/* ==========================================================================
   Steps
   ========================================================================== */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;counter-reset:s}
.step{
  position:relative;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-lg);padding:28px;
}
.step-num{
  width:34px;height:34px;border-radius:10px;
  background:var(--accent-soft);border:1px solid var(--accent-line);
  color:var(--accent);font-weight:700;font-size:14px;
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;
}
.step h3{font-size:17px;margin-bottom:9px}
.step p{font-size:14.6px;color:var(--txt-2);line-height:1.7}

/* ==========================================================================
   Platforms
   ========================================================================== */
.platforms{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.platform{
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-lg);padding:24px;
  transition:border-color .25s var(--ease),transform .25s var(--ease);
}
.platform:hover{border-color:var(--accent-line);transform:translateY(-3px)}
.platform-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}
.platform-name{font-size:16.5px;font-weight:640;letter-spacing:-.02em}
.platform-name em{font-style:normal;color:var(--txt-3);font-weight:400;font-size:13.5px;margin-left:7px}
.platform-tone{font-size:13.5px;color:var(--accent);font-weight:550}
.platform p{font-size:14.3px;color:var(--txt-2);line-height:1.7}

/* ==========================================================================
   Corridors
   ========================================================================== */
.corridors{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.corridor{
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-lg);padding:24px 22px;position:relative;overflow:hidden;
}
.corridor.live{border-color:var(--accent-line);background:
  linear-gradient(180deg,var(--accent-soft) 0%,var(--surface) 60%)}
.corridor-route{font-size:15px;font-weight:620;letter-spacing:-.01em;margin-bottom:6px}
.corridor-note{font-size:13.3px;color:var(--txt-3);line-height:1.6}
.tag{
  display:inline-block;margin-top:14px;padding:3px 10px;border-radius:999px;
  font-size:11px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;
}
.tag.live{background:var(--accent);color:var(--ink-950)}
.tag.soon{background:rgba(255,255,255,.06);color:var(--txt-3);border:1px solid var(--line-2)}

/* ==========================================================================
   Pricing
   ========================================================================== */
.pay-toggle{display:inline-flex;gap:4px;padding:4px;margin:0 auto 28px;border:1px solid var(--line);border-radius:999px;background:var(--surface);}
.pay-toggle{display:flex;width:max-content;max-width:100%}
.pay-opt{
  appearance:none;border:0;background:transparent;cursor:pointer;
  font:600 13px/1 var(--font-en,-apple-system,BlinkMacSystemFont,"Inter",sans-serif);
  color:var(--text-dim);padding:10px 18px;border-radius:999px;transition:.18s;
  white-space:nowrap;
}
.pay-opt:hover{color:var(--text)}
.pay-opt.active{background:var(--accent);color:#fff;box-shadow:0 8px 20px -10px rgba(255,90,54,.7)}
.section .pay-toggle-wrap{display:flex;justify-content:center}

.pricing{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;align-items:start}
.plan{
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-xl);padding:32px 28px;position:relative;
}
.plan.featured{
  border-color:var(--accent-line);
  background:linear-gradient(180deg,var(--accent-soft) 0%,var(--surface) 42%);
  box-shadow:0 30px 70px -40px rgba(255,90,54,.5);
}
.plan-flag{
  position:absolute;top:-11px;left:28px;
  background:var(--accent);color:var(--ink-950);
  font-size:11px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;
  padding:4px 12px;border-radius:999px;
}
.plan-name{font-size:15px;font-weight:600;color:var(--txt-2);letter-spacing:.02em}
.plan-price{display:flex;align-items:baseline;gap:5px;margin:14px 0 6px}
.plan-price .num{font-size:42px;font-weight:680;letter-spacing:-.035em}
.plan-price .per{font-size:14px;color:var(--txt-3)}
.plan-desc{font-size:14px;color:var(--txt-3);margin-bottom:22px;line-height:1.6}
.plan-list{display:flex;flex-direction:column;gap:11px;margin-bottom:26px}
.plan-list li{display:flex;gap:10px;font-size:14.3px;color:var(--txt-2);line-height:1.55}
.plan-list li svg{flex-shrink:0;margin-top:4px}

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq details{
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r);padding:20px 24px;
  transition:border-color .2s var(--ease);
}
.faq details[open]{border-color:var(--line-2)}
.faq summary{
  cursor:pointer;list-style:none;font-size:16px;font-weight:560;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"";width:11px;height:11px;flex-shrink:0;
  border-right:2px solid var(--txt-3);border-bottom:2px solid var(--txt-3);
  transform:rotate(45deg);transition:transform .25s var(--ease);margin-top:-4px;
}
.faq details[open] summary::after{transform:rotate(-135deg);margin-top:2px}
.faq p{margin-top:14px;font-size:14.8px;color:var(--txt-2);line-height:1.75}

/* ==========================================================================
   CTA band
   ========================================================================== */
.cta-band{
  position:relative;padding:80px 0;text-align:center;
  background:
    radial-gradient(60% 100% at 50% 0%,rgba(255,90,54,.14),transparent 70%),
    var(--ink-850);
  border-top:1px solid var(--line);
}
.cta-band h2{font-size:clamp(26px,3.2vw,38px);font-weight:640;letter-spacing:-.03em}
.cta-band p{margin-top:16px;font-size:17px;color:var(--txt-2)}
.cta-band .hero-actions{margin-top:32px}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer{background:var(--ink-950);border-top:1px solid var(--line);padding:64px 0 32px}
.footer-grid{display:grid;grid-template-columns:1.6fr repeat(3,1fr);gap:40px}
.footer-brand p{margin-top:16px;font-size:14px;color:var(--txt-3);max-width:290px;line-height:1.7}
.footer-col h4{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--txt-3);margin-bottom:16px;font-weight:700}
.footer-col a{display:block;font-size:14.3px;color:var(--txt-2);padding:5px 0;transition:color .2s var(--ease)}
.footer-col a:hover{color:var(--accent)}
.footer-bottom{
  margin-top:48px;padding-top:26px;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13.2px;color:var(--txt-3);
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width:980px){
  .cards,.steps,.platforms,.pricing{grid-template-columns:1fr 1fr}
  .corridors{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .nav-links{display:none}
  .nav-links.open{
    display:flex;flex-direction:column;align-items:flex-start;gap:18px;
    position:absolute;top:68px;left:0;right:0;
    background:var(--ink-850);border-bottom:1px solid var(--line);
    padding:22px 24px;
  }
  .nav-links.open .lang{padding-left:0;border-left:none}
  .nav-toggle{
    display:flex;flex-direction:column;gap:5px;background:none;border:0;
    padding:8px;cursor:pointer;
  }
  .nav-toggle span{display:block;width:21px;height:1.6px;background:var(--txt);border-radius:2px}
  .nav-cta .btn-ghost{display:none}
}
@media (max-width:720px){
  .section{padding:68px 0}
  .hero{padding:64px 0 48px}
  .cards,.steps,.platforms,.pricing,.corridors{grid-template-columns:1fr}
  .tool-grid{grid-template-columns:1fr}
  .tool-pane+.tool-pane{border-left:0;border-top:1px solid var(--line)}
  .footer-grid{grid-template-columns:1fr}
  .two-col{grid-template-columns:1fr}
  .trust-strip{gap:18px}
}