/* ===== GomLink · mint theme (trammb.com palette) ===== */
:root{
  --bg:#2c2d30;
  --bg-deep:#222222;
  --surface:rgba(255,255,255,.06);
  --surface-2:rgba(255,255,255,.04);
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.15);

  --mint:#1ab394;
  --mint-soft:#5fd3b8;
  --pink:#ff4274;
  --yellow:#fbdd62;

  --txt:#fafafa;
  --txt-2:rgba(255,255,255,.7);
  --txt-dim:rgba(255,255,255,.5);

  --r-card:16px;
  --r-field:12px;
  --r-pill:999px;

  --sans:'Mulish',ui-sans-serif,system-ui,-apple-system,'Segoe UI',sans-serif;
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg);
  color:var(--txt);
  font-family:var(--sans);
  font-size:15px;
  line-height:1.65;
  min-height:100vh;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

/* backdrop: soft mint glow + dot grid */
.grid-bg{
  position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(ellipse 70% 45% at 15% -5%,rgba(26,179,148,.20),transparent 65%),
    radial-gradient(ellipse 50% 40% at 95% 8%,rgba(255,66,116,.07),transparent 60%),
    var(--bg);
}
.scanlines{
  position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.085;
  background-image:radial-gradient(#fff 1.5px,transparent 1.5px);
  background-size:26px 26px;
  mask-image:linear-gradient(180deg,#000,transparent 62%);
  -webkit-mask-image:linear-gradient(180deg,#000,transparent 62%);
}

.wrap{max-width:1180px;margin:0 auto;padding:0 24px}

/* ---------- header ---------- */
.site-header{padding:4px 0 0}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:26px 24px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:14px;text-decoration:none;color:inherit}
.brand-mark{
  width:42px;height:42px;flex:none;display:grid;place-items:center;
  font-size:17px;color:#fff;border-radius:14px;
  background:var(--mint);box-shadow:0 8px 22px -8px rgba(26,179,148,.9);
}
.brand-name{margin:0;font-size:26px;font-weight:900;letter-spacing:-.03em;color:#fff;line-height:1.15}
.brand-name span{color:var(--mint)}
.site-nav{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.nav-link{
  font-size:14px;font-weight:700;color:var(--txt-2);text-decoration:none;
  padding:8px 4px;border-bottom:2px solid transparent;transition:.18s;
}
.nav-link:hover{color:#fff}
.nav-link.is-current{color:var(--mint-soft);border-bottom-color:var(--mint)}
.nav-cta{
  font-size:14px;font-weight:800;color:#fff;text-decoration:none;
  background:var(--mint);border-radius:var(--r-pill);padding:10px 20px;
  box-shadow:0 8px 22px -10px rgba(26,179,148,.95);transition:.18s;
}
.nav-cta:hover{background:#17a189}
.badge-row{display:flex;gap:8px;flex-wrap:wrap}
.badge{
  font-size:11.5px;font-weight:700;
  border:1px solid var(--line);border-radius:var(--r-pill);
  padding:7px 15px;color:var(--mint-soft);background:var(--surface);
}

/* ---------- stepper ---------- */
.stepper{
  list-style:none;display:grid;grid-template-columns:repeat(3,1fr);
  gap:0;margin:6px 0 22px;padding:0;
}
.step{
  display:flex;align-items:center;gap:13px;padding:14px 18px;cursor:pointer;
  border:1px solid var(--line);border-right:none;background:var(--surface-2);
  transition:.18s;position:relative;
}
.step:first-child{border-radius:var(--r-card) 0 0 var(--r-card)}
.step:last-child{border-right:1px solid var(--line);border-radius:0 var(--r-card) var(--r-card) 0}
.step:hover:not(.is-locked):not(.is-active){background:rgba(255,255,255,.07)}
.step-dot{
  width:34px;height:34px;flex:none;display:grid;place-items:center;
  border-radius:50%;font-size:12px;font-weight:800;
  background:rgba(255,255,255,.08);color:var(--txt-dim);
  border:1px solid var(--line);transition:.18s;
}
.step-text{display:flex;flex-direction:column;line-height:1.35;min-width:0}
.step-text b{font-size:14.5px;font-weight:800;color:var(--txt-2);letter-spacing:-.01em}
.step-text i{font-size:12px;font-style:normal;color:var(--txt-dim);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

.step.is-active{background:rgba(26,179,148,.10);border-color:rgba(26,179,148,.42);z-index:1}
.step.is-active .step-dot{background:var(--mint);color:#fff;border-color:var(--mint);box-shadow:0 6px 18px -8px rgba(26,179,148,.95)}
.step.is-active .step-text b{color:#fff}
.step.is-active .step-text i{color:var(--mint-soft)}

.step.is-done .step-dot{background:rgba(26,179,148,.18);color:var(--mint-soft);border-color:rgba(26,179,148,.45)}
.step.is-done .step-dot::after{content:'✓';font-size:14px}
.step.is-done .step-dot{font-size:0}
.step.is-done .step-text b{color:var(--txt)}

.step.is-locked{cursor:not-allowed;opacity:.45}

/* ---------- điều hướng cuối panel ---------- */
.step-nav{
  display:flex;align-items:center;gap:16px;flex-wrap:wrap;
  margin-top:26px;padding-top:22px;border-top:1px solid var(--line);
}
.step-note{flex:1 1 auto;font-size:13px;color:var(--txt-dim);min-width:180px}
.btn-next{
  font-family:var(--sans);font-size:14.5px;font-weight:800;color:#fff;
  background:var(--mint);border:1px solid var(--mint);border-radius:var(--r-pill);
  padding:12px 26px;cursor:pointer;transition:.18s;
  box-shadow:0 10px 26px -12px rgba(26,179,148,.95);
}
.btn-next:hover:not(:disabled){background:#17a189;border-color:#17a189}
.btn-next:disabled{opacity:.32;cursor:not-allowed;box-shadow:none}
.btn-next.ghost{background:transparent;color:var(--txt-2);border-color:var(--line-strong);box-shadow:none}
.btn-next.ghost:hover{color:#fff;border-color:var(--mint);background:rgba(26,179,148,.14)}
.btn-back{
  font-family:var(--sans);font-size:14px;font-weight:700;color:var(--txt-2);
  background:transparent;border:1px solid var(--line-strong);border-radius:var(--r-pill);
  padding:11px 22px;cursor:pointer;transition:.18s;
}
.btn-back:hover{color:#fff;border-color:var(--txt-dim)}

/* ---------- panels ---------- */
.panel{display:none;border:1px solid var(--line);background:var(--surface-2);border-radius:var(--r-card);padding:28px}
.panel.is-active{display:block;animation:fade .22s ease}
@keyframes fade{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:none}}
.panel-intro{margin:0 0 24px;color:var(--txt-2);max-width:78ch;font-size:14.5px}
.panel-intro strong{color:var(--mint-soft);font-weight:800}

.cols{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.col{display:flex;flex-direction:column;min-width:0}

/* ---------- fields ---------- */
.field-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:18px 0 9px;flex-wrap:wrap}
.field-head:first-child{margin-top:0}
.field-head label{font-size:11.5px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--txt-2)}
.field-actions{display:flex;gap:7px}
.hint{font-size:12px;color:var(--txt-dim)}

textarea{
  width:100%;font-family:var(--mono);font-size:12.5px;line-height:1.8;
  background:var(--bg-deep);color:var(--txt);
  border:1px solid var(--line);border-radius:var(--r-field);
  padding:14px 15px;resize:vertical;min-height:270px;
  transition:border-color .18s,box-shadow .18s;
}
textarea.sm{min-height:132px}
textarea:focus{outline:none;border-color:var(--mint);box-shadow:0 0 0 3px rgba(26,179,148,.18)}
textarea[readonly]{color:var(--mint-soft)}
textarea::placeholder{color:rgba(255,255,255,.28)}

/* ---------- buttons ---------- */
button.mini{
  font-family:var(--sans);font-size:12px;font-weight:700;
  background:transparent;color:var(--txt-2);
  border:1px solid var(--line-strong);border-radius:var(--r-pill);
  padding:7px 16px;cursor:pointer;transition:.18s;
}
button.mini:hover{color:#fff;border-color:var(--mint);background:rgba(26,179,148,.14)}
button.mini.primary{color:#fff;background:var(--mint);border-color:var(--mint);box-shadow:0 6px 18px -8px rgba(26,179,148,.95)}
button.mini.primary:hover{background:#17a189;border-color:#17a189}
button.mini:active{transform:translateY(1px)}

/* ---------- options ---------- */
.opts{border:1px solid var(--line);border-radius:var(--r-field);padding:14px 16px 16px;margin:18px 0 0;background:var(--surface-2)}
.opts legend{font-size:11px;font-weight:800;letter-spacing:.16em;text-transform:uppercase;color:var(--pink);padding:0 7px}
.opt{display:flex;align-items:center;gap:10px;font-size:13.5px;color:var(--txt-2);padding:5px 0;cursor:pointer}
.opt:hover{color:var(--txt)}
.opt input[type=checkbox],.opt input[type=radio]{accent-color:var(--mint);width:15px;height:15px;cursor:pointer;flex:none}
.opt code{font-family:var(--mono);color:var(--yellow);font-size:11.5px}
.opt-inline{gap:8px}
.opt-inline input[type=number]{
  width:70px;font-family:var(--mono);font-size:12.5px;
  background:var(--bg-deep);color:var(--mint-soft);border:1px solid var(--line);
  border-radius:8px;padding:4px 9px;
}
.opt-inline input[type=number]:focus{outline:none;border-color:var(--mint)}

/* ---------- hướng dẫn bước 02 ---------- */
.howto{
  display:flex;align-items:flex-start;gap:22px;flex-wrap:wrap;
  border:1px solid rgba(26,179,148,.3);background:rgba(26,179,148,.07);
  border-radius:var(--r-card);padding:20px 22px;margin-bottom:24px;
}
.howto-cta{
  flex:none;font-size:14.5px;font-weight:800;color:#fff;text-decoration:none;
  background:var(--mint);border-radius:var(--r-pill);padding:12px 22px;
  box-shadow:0 10px 26px -12px rgba(26,179,148,.95);transition:.18s;white-space:nowrap;
}
.howto-cta:hover{background:#17a189}
.howto-steps{
  flex:1 1 320px;list-style:none;counter-reset:h;margin:0;padding:0;
  display:flex;flex-direction:column;gap:9px;min-width:0;
}
.howto-steps li{counter-increment:h;position:relative;padding-left:32px;font-size:14px;color:var(--txt-2)}
.howto-steps li::before{
  content:counter(h);position:absolute;left:0;top:1px;
  width:21px;height:21px;display:grid;place-items:center;
  font-size:11px;font-weight:800;color:var(--mint-soft);
  background:rgba(26,179,148,.16);border:1px solid rgba(26,179,148,.4);border-radius:50%;
}
.howto-steps b{color:#fff;font-weight:800}
.howto-steps em{color:var(--yellow);font-style:normal;font-weight:700}

.pair-note{
  margin:14px 0 0;padding:13px 15px;font-size:13px;color:var(--txt-2);
  border:1px solid var(--line);border-radius:var(--r-field);background:var(--surface-2);
}
.pair-note strong{color:var(--mint-soft);font-weight:800}

/* ---------- phần tử phụ ---------- */
.count{
  display:inline-block;margin-left:6px;padding:2px 9px;border-radius:var(--r-pill);
  background:rgba(26,179,148,.18);color:var(--mint-soft);font-size:11.5px;font-weight:800;
}
a.ext{color:var(--mint-soft);font-weight:800;text-decoration:none;border-bottom:1px solid rgba(95,211,184,.4)}
a.ext:hover{color:#fff;border-bottom-color:#fff}
textarea.md{min-height:200px}
.result-block{margin-bottom:26px}
.result-block[hidden]{display:none}
.result-block textarea{min-height:230px;border-color:rgba(26,179,148,.35);box-shadow:0 0 0 3px rgba(26,179,148,.07)}
.diff-note{margin:9px 0 0}

/* ---------- khung nhóm link ---------- */
.groups-hint{margin:0 0 10px;font-size:12.5px;color:var(--txt-dim)}
.groups-hint b{color:var(--mint-soft);font-weight:800}
.groups{display:flex;flex-direction:column;gap:12px;max-height:520px;overflow-y:auto;padding-right:2px}
.groups:empty{display:none}
.group{border:1px solid var(--line);border-radius:var(--r-field);background:var(--bg-deep);overflow:hidden}
.group-head{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:9px 10px 9px 14px;border-bottom:1px solid var(--line);background:rgba(26,179,148,.08);
}
.group-head span{font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--mint-soft)}
.group textarea{
  min-height:0;border:none;border-radius:0;background:transparent;
  padding:11px 14px;resize:none;overflow:hidden;color:var(--mint-soft);
}
.group textarea:focus{box-shadow:none;border:none;outline:1px solid rgba(26,179,148,.45);outline-offset:-1px}

/* ---------- ô kết quả bước 03 ---------- */
.result{border:1px solid rgba(26,179,148,.3);background:rgba(26,179,148,.05);border-radius:var(--r-card);padding:20px 22px;margin-bottom:22px}
.result-top{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;flex-wrap:wrap;margin-bottom:14px}
.result-top h3{margin:0 0 4px;font-size:18px;font-weight:800;letter-spacing:-.02em;color:#fff}
.result-top p{margin:0;font-size:13.5px;color:var(--txt-2);max-width:62ch}
.result-acts{display:flex;align-items:center;gap:9px;flex-wrap:wrap}
.result-acts .btn-next{font-size:13.5px;padding:10px 20px}
.result textarea{
  min-height:180px;font-size:13px;line-height:1.85;
  border-color:rgba(26,179,148,.28);background:var(--bg-deep);color:var(--txt);
}
.result-foot{display:flex;align-items:center;gap:11px;flex-wrap:wrap;margin-top:11px;font-size:12.5px;color:var(--txt-dim)}

/* ---------- stats ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:16px}
.stat{border:1px solid var(--line);border-radius:var(--r-field);padding:13px 8px;text-align:center;background:var(--surface)}
.stat-val{display:block;font-size:26px;font-weight:900;letter-spacing:-.03em;color:var(--mint);line-height:1.1}
.stat-lbl{display:block;font-size:10.5px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--txt-dim);margin-top:5px}

/* ---------- warn ---------- */
.warn{margin-top:16px;border:1px solid rgba(251,221,98,.32);background:rgba(251,221,98,.07);border-radius:var(--r-field);padding:14px 16px}
.warn strong{color:var(--yellow);font-size:13.5px;font-weight:800;display:block}
.warn p{margin:7px 0 9px;font-size:13px;color:var(--txt-2)}
.warn ul{margin:8px 0 0;padding-left:20px;font-size:13px;color:var(--txt-2)}
.warn ul li{margin-bottom:5px}

/* ---------- guide ---------- */
.guide{max-width:74ch}
.guide h2{font-size:12px;font-weight:800;letter-spacing:.18em;text-transform:uppercase;color:var(--pink);margin:36px 0 16px;padding-bottom:9px;border-bottom:1px solid var(--line)}
.guide h2:first-child{margin-top:0}
.guide p{color:var(--txt-2);font-size:14.5px}
.steps{list-style:none;counter-reset:s;padding:0;margin:0}
.steps li{counter-increment:s;position:relative;padding:0 0 26px 50px;border-left:1px solid var(--line);margin-left:16px}
.steps li:last-child{border-left-color:transparent;padding-bottom:0}
.steps li::before{
  content:counter(s,decimal-leading-zero);
  position:absolute;left:-16px;top:0;width:33px;height:33px;
  display:grid;place-items:center;font-size:12px;font-weight:800;
  color:#fff;background:var(--mint);border-radius:50%;
  box-shadow:0 6px 18px -8px rgba(26,179,148,.95);
}
.steps h3{margin:3px 0 6px;font-size:16px;font-weight:800;letter-spacing:-.02em;color:#fff}
.steps p{margin:0;font-size:14px}
.steps strong,.guide strong{color:var(--mint-soft);font-weight:800}
.steps em{color:var(--yellow);font-style:normal;font-weight:700}
.steps code,.guide code{font-family:var(--mono);font-size:12.5px;color:var(--txt)}
.fmt{list-style:none;padding:0;margin:0}
.fmt li{padding:10px 0 10px 22px;position:relative;font-size:13.5px;border-bottom:1px solid var(--line)}
.fmt li:last-child{border-bottom:none}
.fmt li::before{content:'';position:absolute;left:0;top:18px;width:7px;height:7px;border-radius:50%;background:var(--mint)}
.fmt li.muted::before{background:var(--yellow)}
.fmt code{color:var(--txt-2);font-size:12.5px}
.fmt code b{color:var(--pink);font-weight:700}
.fmt li.muted{color:var(--txt-dim)}
.fmt li b{color:#fff;font-weight:800}
.fmt li em{color:var(--yellow);font-style:normal;font-weight:700}

/* ---------- guide: thẻ thông tin ---------- */
.card-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:4px 0 8px}
.info-card{border:1px solid var(--line);background:var(--surface);border-radius:var(--r-field);padding:16px 18px}
.info-card h4{margin:0 0 8px;font-size:15px;font-weight:800;color:#fff;letter-spacing:-.01em}
.info-card p{margin:0 0 8px;font-size:13.5px;color:var(--txt-2)}
.info-card p:last-child{margin-bottom:0}
.info-card .caveat{color:var(--txt-dim);font-size:12.5px}
.tag{
  display:inline-block;margin-left:7px;padding:2px 9px;border-radius:var(--r-pill);
  background:rgba(26,179,148,.18);color:var(--mint-soft);font-size:10.5px;font-weight:800;
  letter-spacing:.06em;text-transform:uppercase;vertical-align:middle;
}
.mono-list{display:flex;flex-wrap:wrap;gap:7px}
.mono-list code{
  background:var(--bg-deep);border:1px solid var(--line);border-radius:7px;
  padding:3px 9px;font-size:12px;color:var(--yellow);
}
.guide-cta{margin-top:36px;padding-top:26px;border-top:1px solid var(--line)}

/* ---------- footer ---------- */
.site-footer{margin-top:56px;padding:26px 0 40px;border-top:1px solid var(--line);font-size:13px;color:var(--txt-dim);text-align:center}
.site-footer a{color:var(--mint-soft);text-decoration:none;font-weight:700}
.site-footer a:hover{color:#fff}

/* ---------- toast ---------- */
.toast{
  position:fixed;left:50%;bottom:36px;transform:translate(-50%,22px);
  background:var(--mint);color:#fff;font-weight:800;font-size:13.5px;
  padding:13px 26px;border-radius:var(--r-pill);
  box-shadow:0 16px 40px -12px rgba(26,179,148,.9);
  opacity:0;pointer-events:none;transition:.24s;z-index:50;
}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast.err{background:var(--yellow);color:#2c2d30;box-shadow:0 16px 40px -12px rgba(251,221,98,.75)}

@media(max-width:860px){
  .cols{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .header-inner{padding:20px 0}
  .wrap{padding:0 16px}
  .panel{padding:20px 16px}
  .stepper{grid-template-columns:1fr}
  .step{border-right:1px solid var(--line);border-bottom:none;padding:12px 14px}
  .step:first-child{border-radius:var(--r-card) var(--r-card) 0 0}
  .step:last-child{border-radius:0 0 var(--r-card) var(--r-card);border-bottom:1px solid var(--line)}
  .step:not(:last-child){border-bottom:none}
  .card-row{grid-template-columns:1fr}
  .howto{flex-direction:column;gap:16px;padding:16px}
  .result-top{flex-direction:column;align-items:stretch}
  .result-acts{flex-wrap:wrap}
  .result-acts .btn-next{width:100%}
  .howto-cta{width:100%;text-align:center}
  .step-nav{flex-direction:column;align-items:stretch}
  .step-nav .btn-next,.step-nav .btn-back{width:100%}
  .step-note{order:-1;text-align:center;min-width:0}
}