/* =========================================================================
   DocSwap — styles.css
   Teal accent within the EuKosmos visual family.
   ========================================================================= */

:root{
  --bg:        #0a0d14;
  --bg-grid:   rgba(20, 184, 166, 0.045);
  --surface:   #11151f;
  --surface2:  #161b27;
  --surface3:  #1d2331;
  --surface4:  #232a3b;
  --border:    rgba(255,255,255,.07);
  --border-strong: rgba(255,255,255,.13);
  --ink:       #f1f5f9;
  --soft:      #cbd5e1;
  --mute:      #8b94a7;
  --muted:     #64748b;

  /* Accent — teal */
  --accent:    #14b8a6;
  --accent-2:  #2dd4bf;
  --accent-3:  #0d9488;
  --accent-tint: rgba(20, 184, 166, .14);

  --ok:        #10b981;
  --warn:      #f59e0b;
  --bad:       #f87171;
  --info:      #38bdf8;

  --r-sm: 6px;
  --r:    10px;
  --r-lg: 14px;

  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", "SF Mono", Menlo, Monaco, Consolas, "DejaVu Sans Mono", monospace;
}

*,*::before,*::after{box-sizing:border-box;}
html,body{margin:0;padding:0;}
html{font-size:15.5px;}
body{
  background:
    radial-gradient(1100px 600px at 80% -10%, rgba(20, 184, 166, .09), transparent 70%),
    radial-gradient(900px 500px at -10% 100%, rgba(20, 184, 166, .05), transparent 70%),
    linear-gradient(var(--bg-grid) 1px, transparent 1px) 0 0/28px 28px,
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px) 0 0/28px 28px,
    var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
}
button{font-family:inherit;color:inherit;}
input,textarea,select{font-family:inherit;color:inherit;}
a{color:var(--accent-2);text-decoration:none;}
a:hover{text-decoration:underline;}
h1,h2,h3,h4{margin:0;}
code{font-family:var(--mono);font-size:.9em;}

/* ---------- masthead ---------------------------------------------------- */
.masthead{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 28px;
  border-bottom:1px solid var(--border);
  background:rgba(10,13,20,.7);
  backdrop-filter:blur(10px);
  position:sticky;top:0;z-index:50;
}
.masthead__brand{display:flex;align-items:center;color:var(--ink);}
.masthead__logo{font-weight:800;letter-spacing:.06em;font-size:15px;}
.masthead__logo-accent{color:var(--accent);}
.masthead__logo-bracket{color:var(--mute);font-weight:600;margin:0 2px;}
.masthead__nav{display:flex;gap:18px;align-items:center;font-size:13px;flex-wrap:wrap;justify-content:flex-end;}
.masthead__nav a{color:var(--soft);}
.masthead__nav a:hover{color:var(--accent-2);text-decoration:none;}

/* ---------- container --------------------------------------------------- */
.container{max-width:1380px;margin:0 auto;padding:32px 28px 60px;}
.hero{margin-bottom:22px;}
.hero__title{
  font-size:34px;font-weight:800;letter-spacing:-.02em;
  background:linear-gradient(135deg, var(--ink) 0%, var(--accent-2) 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  display:inline-block;
}
.hero__sub{margin:8px 0 0;color:var(--mute);max-width:880px;}
.hero__sub strong{color:var(--soft);font-weight:600;}

/* ---------- format bar -------------------------------------------------- */
.format-bar{
  display:flex;align-items:center;gap:14px;
  padding:14px 18px;margin-bottom:12px;
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--r);
  flex-wrap:wrap;
}
.format-bar__group{display:flex;align-items:center;gap:10px;}
.format-bar__group--engine{margin-left:auto;}
.format-bar__label{font-size:11.5px;color:var(--mute);text-transform:uppercase;letter-spacing:.05em;font-weight:700;}
.format-bar__swap{
  width:36px;height:36px;
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--surface3);
  color:var(--accent-2);
  border:1px solid var(--border);border-radius:99px;
  cursor:pointer;
  transition:background .12s, color .12s, transform .15s;
}
.format-bar__swap:hover{background:var(--accent);color:#0a0d14;transform:rotate(180deg);}
.format-bar__sep{flex:0 0 1px;height:24px;background:var(--border);margin:0 4px;}

.select{
  background:var(--surface3);color:var(--ink);
  border:1px solid var(--border);border-radius:var(--r-sm);
  padding:7px 12px;font-size:13px;cursor:pointer;outline:0;
}
.select--lg{padding:9px 14px;font-size:14px;min-width:150px;}
.select:focus{border-color:var(--accent);}

.engine-toggle{
  display:inline-flex;gap:1px;
  background:var(--border);
  border-radius:99px;padding:2px;
}
.engine-toggle__opt{
  display:inline-flex;align-items:center;
  padding:6px 14px;
  background:var(--surface3);
  border-radius:99px;
  cursor:pointer;
  font-size:13px;font-weight:500;color:var(--mute);
  user-select:none;
  transition:background .12s, color .12s;
}
.engine-toggle__opt input{
  position:absolute;width:0;height:0;opacity:0;
}
.engine-toggle__opt:has(input:checked){
  background:var(--accent);color:#0a0d14;font-weight:600;
}
.engine-toggle__opt:hover:not(:has(input:checked)){
  color:var(--ink);
}

/* ---------- pandoc banner ---------------------------------------------- */
.banner{
  display:flex;align-items:center;gap:14px;
  padding:12px 16px;margin-bottom:12px;
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--r);
}
.banner--pandoc{
  border-color:rgba(20,184,166,.3);
  background:linear-gradient(180deg, rgba(20,184,166,.06) 0%, var(--surface) 100%);
}
.banner__icon{
  width:32px;height:32px;flex-shrink:0;
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--surface3);
  border:1px solid var(--border);
  border-radius:99px;
  color:var(--mute);
  font-size:14px;font-weight:700;
}
.banner__icon--loading{
  color:var(--accent);
  animation:spin 1.4s linear infinite;
  background:rgba(20,184,166,.12);border-color:var(--accent);
}
@keyframes spin{ to{transform:rotate(360deg);} }
.banner__icon--ready{color:var(--ok);background:rgba(16,185,129,.12);border-color:rgba(16,185,129,.4);}
.banner__icon--error{color:var(--bad);background:rgba(248,113,113,.12);border-color:rgba(248,113,113,.4);}
.banner__body{flex:1;min-width:0;}
.banner__head{font-size:13.5px;font-weight:600;color:var(--ink);}
.banner__sub{font-size:12px;color:var(--mute);margin-top:2px;}
.banner__progress-wrap{margin-top:6px;}
.banner__progress{
  height:5px;background:var(--surface3);border-radius:99px;overflow:hidden;
  border:1px solid var(--border);
}
.banner__progress-bar{
  height:100%;width:0;
  background:linear-gradient(90deg, var(--accent), var(--accent-2));
  transition:width .15s;
}
.banner__actions{display:flex;gap:6px;flex-shrink:0;}

/* ---------- action bar -------------------------------------------------- */
.action-bar{
  display:flex;justify-content:space-between;align-items:center;gap:12px;
  padding:11px 12px;margin-bottom:12px;
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--r);
  flex-wrap:wrap;
}
.action-group{display:flex;align-items:center;gap:8px;flex-wrap:wrap;}

.btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:8px 14px;
  background:var(--surface3);
  color:var(--soft);
  border:1px solid var(--border);
  border-radius:var(--r-sm);
  font-size:13px;font-weight:500;
  cursor:pointer;
  transition:background .12s, border-color .12s, color .12s;
}
.btn:hover{background:var(--surface4);color:var(--ink);border-color:var(--border-strong);}
.btn:active{transform:translateY(1px);}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px;}
.btn--primary{
  background:var(--accent);color:#0a0d14;border-color:var(--accent);font-weight:600;
}
.btn--primary:hover{background:var(--accent-2);border-color:var(--accent-2);color:#0a0d14;}
.btn--ghost{background:transparent;}
.btn--ghost:hover{background:var(--surface3);}
.btn--sm{padding:5px 11px;font-size:12px;}
.btn--danger-soft:hover{color:var(--bad);border-color:rgba(248,113,113,.3);}

.check{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 0;
  font-size:13px;color:var(--soft);
  cursor:pointer;user-select:none;
}
.check input{accent-color:var(--accent);margin:0;}

/* ---------- io grid ----------------------------------------------------- */
.io-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px;
}
@media (max-width: 1020px){.io-grid{grid-template-columns:1fr;}}
.io-pane{
  display:flex;flex-direction:column;
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--r);
  overflow:hidden;
  min-height:520px;
}
.io-head{
  display:flex;justify-content:space-between;align-items:center;gap:12px;
  padding:8px 12px;
  background:var(--surface2);
  border-bottom:1px solid var(--border);
}
.io-head__title{font-size:12.5px;font-weight:600;color:var(--soft);}
.io-head__fmt{
  display:inline-block;margin-left:4px;
  padding:1px 7px;
  background:rgba(20,184,166,.14);
  color:var(--accent-2);
  font-family:var(--mono);font-size:11px;font-weight:700;
  border-radius:3px;text-transform:lowercase;
}
.io-meta{font-size:11.5px;color:var(--mute);font-weight:500;}
.io-actions{display:flex;gap:4px;}
.icon-btn{
  display:inline-flex;align-items:center;gap:5px;
  padding:5px 10px;
  background:transparent;border:1px solid transparent;
  color:var(--mute);font-size:12px;
  border-radius:var(--r-sm);
  cursor:pointer;
}
.icon-btn:hover{background:var(--surface3);color:var(--ink);border-color:var(--border);}

.io-body{
  flex:1;display:flex;position:relative;min-height:0;
}
.io-body textarea{
  flex:1;width:100%;
  padding:14px 16px;
  background:transparent;color:var(--ink);
  border:0;outline:0;resize:none;
  font-family:var(--mono);font-size:13px;line-height:1.55;
}
.io-body textarea::placeholder{color:var(--muted);}
.io-body textarea[readonly]{color:var(--soft);}

.dropzone-overlay{
  position:absolute;inset:8px;
  background:rgba(20,184,166,.10);
  border:2px dashed var(--accent);
  border-radius:var(--r);
  display:flex;align-items:center;justify-content:center;
  pointer-events:none;
  z-index:2;
}
.dropzone-overlay__msg{
  font-size:15px;font-weight:600;color:var(--accent-2);
  background:var(--surface);
  padding:10px 20px;border-radius:99px;
  border:1px solid var(--accent);
}

.output-binary{
  flex:1;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:14px;padding:24px;text-align:center;
}
.output-binary__icon{font-size:48px;}
.output-binary__head{font-size:14px;font-weight:600;color:var(--accent-2);}
.output-binary__sub{font-size:12.5px;color:var(--mute);margin-top:4px;}

.io-foot{
  padding:10px 14px;background:var(--surface2);border-top:1px solid var(--border);
}
.io-foot__head{font-size:11px;color:var(--mute);text-transform:uppercase;letter-spacing:.04em;font-weight:700;margin-bottom:6px;}
.messages{margin:0;padding:0 0 0 16px;font-size:12px;color:var(--soft);}
.messages li{margin:2px 0;}

/* ---------- options panel ---------------------------------------------- */
.options-panel{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--r);
  margin-top:12px;
  overflow:hidden;
}
.options-panel__head{
  display:flex;justify-content:space-between;align-items:center;
  padding:12px 16px;
  cursor:pointer;
  background:var(--surface2);
  list-style:none;
}
.options-panel__head::-webkit-details-marker{display:none;}
.options-panel__head::marker{display:none;}
.options-panel__title{font-size:13px;font-weight:600;color:var(--accent-2);letter-spacing:.02em;}
.options-panel__caret{color:var(--mute);font-size:12px;transition:transform .15s;}
.options-panel[open] .options-panel__caret{transform:rotate(180deg);}
.options-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(260px, 1fr));
  gap:0;
}
.option-group{
  padding:16px 20px;
  border-top:1px solid var(--border);
  border-left:1px solid var(--border);
  display:flex;flex-direction:column;gap:8px;
}
.option-group:first-child{border-left:0;}
@media (max-width: 920px){.option-group{border-left:0;}}
.option-group__title{
  font-size:11px;font-weight:700;color:var(--mute);
  text-transform:uppercase;letter-spacing:.06em;margin-bottom:6px;
}
.option-group__hint{font-size:10px;color:var(--accent-2);font-weight:600;text-transform:none;letter-spacing:0;background:rgba(20,184,166,.12);padding:1px 5px;border-radius:3px;}
.field{display:flex;flex-direction:column;gap:5px;margin-bottom:2px;}
.field__label{font-size:11.5px;color:var(--mute);font-weight:500;}
.text-input{
  background:var(--surface3);color:var(--ink);
  border:1px solid var(--border);border-radius:var(--r-sm);
  padding:7px 10px;font-size:13px;outline:0;
}
.text-input:focus{border-color:var(--accent);}

/* ---------- EuKosmos card ---------------------------------------------- */
.panel{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--r-lg);
  padding:24px 28px;
}
.panel--teal{
  border:1px solid rgba(20,184,166,.3);
  background:
    radial-gradient(800px 360px at 100% -20%, rgba(20,184,166,.10), transparent 70%),
    var(--surface);
}
.euk-card__head{margin-bottom:20px;}
.euk-card__title{font-size:20px;font-weight:700;}
.euk-card__brand{
  background:linear-gradient(135deg, var(--accent-2), var(--accent-3));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.euk-card__sub{color:var(--mute);margin:6px 0 0;font-size:13.5px;}
.euk-card__grid{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(180px, 1fr));
  gap:10px;
}
.euk-tile{
  display:flex;flex-direction:column;gap:4px;
  padding:14px 16px;
  background:rgba(255,255,255,.025);
  border:1px solid var(--border);
  border-radius:var(--r);
  color:var(--ink);
  transition:background .12s, border-color .12s, transform .12s;
}
.euk-tile:hover{
  background:rgba(255,255,255,.05);
  border-color:rgba(20,184,166,.4);
  transform:translateY(-1px);
  text-decoration:none;
}
.euk-tile__name{font-size:14px;font-weight:700;color:var(--accent-2);letter-spacing:-.01em;}
.euk-tile__desc{font-size:12.5px;color:var(--mute);}

/* ---------- footer ----------------------------------------------------- */
.footer{
  padding:24px 28px 36px;
  font-size:12px;color:var(--mute);text-align:center;
  border-top:1px solid var(--border);
  margin-top:40px;
}
.footer__row{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;}
.footer__sep{color:var(--muted);}
.footer a{color:var(--soft);}
.footer a:hover{color:var(--accent-2);}

/* ---------- dialog ----------------------------------------------------- */
.dialog{
  border:1px solid var(--border);
  border-radius:var(--r-lg);
  background:var(--surface);
  color:var(--ink);
  width:min(560px, 92vw);
  padding:0;
}
.dialog::backdrop{background:rgba(0,0,0,.6);backdrop-filter:blur(2px);}
.dialog__head{
  display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:14px 20px;border-bottom:1px solid var(--border);
}
.dialog__head h3{font-size:14px;font-weight:600;}
.dialog__close{
  background:transparent;border:0;color:var(--mute);
  font-size:18px;width:32px;height:32px;border-radius:var(--r-sm);cursor:pointer;
}
.dialog__close:hover{background:var(--surface3);color:var(--ink);}
.sample-list{display:grid;gap:10px;padding:16px 20px 20px;}
.sample-card{
  display:flex;flex-direction:column;align-items:flex-start;gap:4px;
  padding:12px 14px;
  background:var(--surface2);border:1px solid var(--border);
  border-radius:var(--r);
  text-align:left;cursor:pointer;
  transition:background .12s, border-color .12s;
}
.sample-card:hover{background:var(--surface3);border-color:var(--accent);}
.sample-card__label{font-size:13px;font-weight:600;color:var(--ink);}
.sample-card__preview{font-size:11.5px;color:var(--mute);line-height:1.45;font-family:var(--mono);}

/* ---------- toast ------------------------------------------------------ */
.toast{
  position:fixed;left:50%;bottom:28px;transform:translateX(-50%) translateY(20px);
  background:var(--surface3);
  color:var(--ink);
  padding:10px 18px;border-radius:99px;
  border:1px solid var(--border-strong);
  font-size:13px;font-weight:500;
  opacity:0;pointer-events:none;
  transition:opacity .18s, transform .18s;
  z-index:1000;
  box-shadow:0 8px 28px rgba(0,0,0,.4);
}
.toast.is-visible{opacity:1;transform:translateX(-50%) translateY(0);}