/* ==========================================================================
   YAML → CSV Converter — Design tokens
   Palette: deep slate console with teal (YAML) / amber (CSV) accents
   ========================================================================== */
:root{
  --bg:#0d151d;
  --bg-alt:#111c26;
  --panel:#152230;
  --panel-2:#1a2b3a;
  --border:#26394a;
  --text:#e7eef4;
  --text-dim:#9fb2c2;
  --text-faint:#6d8496;
  --teal:#5eead4;
  --teal-dim:#2f8f80;
  --amber:#f5a524;
  --amber-dim:#b5791c;
  --danger:#ff6b6b;
  --success:#5eead4;
  --radius-sm:6px;
  --radius-md:10px;
  --radius-lg:16px;
  --shadow:0 12px 32px -12px rgba(0,0,0,.55);
  --font-display:'Outfit',system-ui,sans-serif;
  --font-body:'Inter',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,Menlo,Consolas,monospace;
  color-scheme: dark;
}

html[data-theme="light"]{
  --bg:#f6f8fa;
  --bg-alt:#eef2f5;
  --panel:#ffffff;
  --panel-2:#f2f5f7;
  --border:#dde4ea;
  --text:#122029;
  --text-dim:#4b6270;
  --text-faint:#7c909c;
  --teal-dim:#2f8f80;
  --amber-dim:#b5791c;
  --shadow:0 12px 32px -14px rgba(20,40,60,.18);
  color-scheme: light;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
h1,h2,h3{font-family:var(--font-display);margin:0 0 .5em;line-height:1.15;letter-spacing:-.01em;}
p{margin:0 0 1em;color:var(--text-dim);}
code{font-family:var(--font-mono);background:var(--panel-2);padding:.1em .4em;border-radius:4px;font-size:.9em;color:var(--teal);}
.skip-link{position:absolute;left:-999px;top:0;background:var(--panel);color:var(--text);padding:.75em 1.25em;z-index:999;border-radius:0 0 8px 0;}
.skip-link:focus{left:0;}
:focus-visible{outline:2px solid var(--teal);outline-offset:2px;}
@media (prefers-reduced-motion: reduce){*{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important;}}

.eyebrow{font-family:var(--font-mono);font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--teal);margin:0 0 .6em;}
.section-head{max-width:720px;margin:0 auto 2.4rem;text-align:center;padding:0 1.25rem;}
.section-sub{max-width:560px;margin:0 auto;}

main{max-width:1240px;margin:0 auto;padding:0 1.25rem;}
section{padding:4.5rem 0;}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5em;padding:.85em 1.6em;border-radius:999px;font-weight:600;font-size:.95rem;border:1px solid transparent;cursor:pointer;transition:transform .15s ease, box-shadow .15s ease, background .15s ease, opacity .15s;font-family:var(--font-body);}
.btn:active{transform:scale(.97);}
.btn-primary{background:var(--teal);color:#06231f;}
.btn-primary:hover{box-shadow:0 8px 22px -8px rgba(94,234,212,.55);}
.btn-primary:disabled{opacity:.5;cursor:not-allowed;box-shadow:none;transform:none;}
.btn-ghost{background:transparent;color:var(--text);border-color:var(--border);}
.btn-ghost:hover{border-color:var(--teal-dim);}
.btn-ghost-invert{background:transparent;color:#06231f;border-color:rgba(6,35,31,.35);}
.btn-ghost-invert:hover{background:rgba(6,35,31,.08);}
.btn-outline{background:transparent;border-color:var(--border);color:var(--text);}
.btn-outline:hover{border-color:var(--teal-dim);}
.btn-outline:disabled,.btn-primary:disabled{opacity:.45;cursor:not-allowed;}
.btn-full{width:100%;}
.btn-sm{padding:.55em 1.1em;font-size:.85rem;}
.chip-btn{font-family:var(--font-mono);font-size:.75rem;background:var(--panel-2);border:1px solid var(--border);color:var(--text-dim);padding:.4em .8em;border-radius:6px;cursor:pointer;transition:border-color .15s,color .15s;}
.chip-btn:hover{border-color:var(--teal-dim);color:var(--text);}
.chip-btn:disabled{opacity:.4;cursor:not-allowed;}
.btn-spinner{display:none;animation:spin .8s linear infinite;}
.is-loading .btn-spinner{display:inline-block;}
.is-loading .btn-label{opacity:.7;}
@keyframes spin{to{transform:rotate(360deg);}}

/* ============ HEADER ============ */
.site-header{position:sticky;top:0;z-index:100;background:rgba(13,21,29,.86);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);}
html[data-theme="light"] .site-header{background:rgba(246,248,250,.9);}
.header-inner{max-width:1240px;margin:0 auto;padding:0 1.25rem;height:64px;display:flex;align-items:center;justify-content:space-between;gap:1rem;}
.brand{display:flex;align-items:center;gap:.5em;font-family:var(--font-display);font-weight:700;font-size:1.05rem;}
.brand-mark{color:var(--teal);font-family:var(--font-mono);}
.main-nav ul{list-style:none;display:flex;align-items:center;gap:1.75rem;margin:0;padding:0;}
.main-nav a{font-size:.92rem;color:var(--text-dim);transition:color .15s;}
.main-nav a:hover{color:var(--text);}
.nav-drop-btn{background:none;border:none;color:var(--text-dim);font-family:var(--font-body);font-size:.92rem;display:flex;align-items:center;gap:.4em;cursor:pointer;padding:.5em 0;}
.nav-drop-btn:hover{color:var(--text);}
.has-dropdown{position:relative;}
.dropdown{position:absolute;top:100%;left:50%;transform:translateX(-50%);background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-md);min-width:220px;padding:.5rem;list-style:none;margin:0;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:opacity .15s ease;z-index:50;}
.has-dropdown:hover .dropdown,.has-dropdown:focus-within .dropdown{opacity:1;visibility:visible;}
.dropdown li a{display:block;padding:.55em .7em;border-radius:6px;font-size:.86rem;color:var(--text-dim);}
.dropdown li a:hover{background:var(--panel-2);color:var(--text);}
.header-actions{display:flex;align-items:center;gap:.6rem;}
.theme-toggle{width:38px;height:38px;border-radius:999px;border:1px solid var(--border);background:var(--panel-2);color:var(--text);display:flex;align-items:center;justify-content:center;cursor:pointer;flex-shrink:0;}
.icon-moon{display:none;}
html[data-theme="light"] .icon-sun{display:none;}
html[data-theme="light"] .icon-moon{display:block;}
.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:38px;height:38px;background:none;border:none;cursor:pointer;}
.nav-toggle span{display:block;width:20px;height:2px;background:var(--text);margin:0 auto;transition:transform .2s,opacity .2s;}

/* ============ BREADCRUMB ============ */
.breadcrumb-wrap{max-width:1240px;margin:0 auto;padding:1.1rem 1.25rem 0;}
.breadcrumb{list-style:none;display:flex;flex-wrap:wrap;gap:.4em;margin:0;padding:0;font-size:.82rem;color:var(--text-faint);}
.breadcrumb li:not(:last-child)::after{content:'/';margin-left:.5em;color:var(--text-faint);}
.breadcrumb a{color:var(--text-faint);}
.breadcrumb a:hover{color:var(--teal);}
.breadcrumb li[aria-current]{color:var(--text-dim);}

/* ============ HERO ============ */
.hero{padding:3.5rem 0 3rem;}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:3rem;align-items:center;}
.hero h1{font-size:clamp(2.4rem,5vw,3.6rem);}
.hero h1 span{color:var(--teal);}
.hero-sub{font-size:1.05rem;max-width:520px;}
.hero-cta{display:flex;gap:.9rem;flex-wrap:wrap;margin-bottom:2rem;}
.hero-stats{list-style:none;display:flex;gap:2rem;margin:0;padding:0;}
.hero-stats li{display:flex;flex-direction:column;gap:.15em;}
.hero-stats strong{font-family:var(--font-mono);font-size:1.3rem;color:var(--teal);}
.hero-stats span{font-size:.78rem;color:var(--text-faint);}

.hero-visual{display:flex;flex-direction:column;align-items:center;gap:.6rem;}
.stream-card{width:100%;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow);}
.stream-card.accent{border-color:var(--amber-dim);}
.stream-head{display:flex;align-items:center;gap:.4rem;padding:.6rem .9rem;background:var(--panel-2);border-bottom:1px solid var(--border);font-family:var(--font-mono);font-size:.72rem;color:var(--text-faint);}
.dot{width:8px;height:8px;border-radius:50%;display:inline-block;}
.d1{background:#ff6b6b;}.d2{background:#f5a524;}.d3{background:#5eead4;}
.stream-code{margin:0;padding:1rem 1.1rem;font-family:var(--font-mono);font-size:.82rem;color:var(--text-dim);white-space:pre;overflow-x:auto;}
.stream-card.accent .stream-code{color:var(--amber);}
.stream-arrow{color:var(--teal-dim);transform:rotate(90deg);}

/* ============ TOOL STRIP ============ */
.tool-strip{padding:1.2rem 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:var(--bg-alt);overflow:hidden;}
.tool-strip-inner{max-width:1240px;margin:0 auto;padding:0 1.25rem;}
.tool-strip-label{font-family:var(--font-mono);font-size:.72rem;color:var(--text-faint);text-transform:uppercase;letter-spacing:.1em;margin-bottom:.7rem;}
.tool-strip-track{display:flex;gap:.6rem;overflow-x:auto;padding-bottom:.4rem;scrollbar-width:thin;}
.tool-strip-track a{flex:0 0 auto;font-size:.8rem;color:var(--text-dim);background:var(--panel);border:1px solid var(--border);padding:.5em 1em;border-radius:999px;white-space:nowrap;transition:border-color .15s,color .15s;}
.tool-strip-track a:hover{border-color:var(--teal-dim);color:var(--text);}

/* ============ CONVERTER ============ */
.converter-section{scroll-margin-top:80px;}
.converter-panel{display:grid;grid-template-columns:1fr 220px 1fr;gap:1.25rem;align-items:stretch;}
.panel-col{display:flex;flex-direction:column;min-width:0;}
.panel-col-head{display:flex;align-items:center;justify-content:space-between;gap:.6rem;margin-bottom:.6rem;flex-wrap:wrap;}
.panel-col-head label{font-family:var(--font-mono);font-size:.8rem;color:var(--text-dim);}
.panel-col-actions{display:flex;gap:.4rem;flex-wrap:wrap;}
.editor-wrap{position:relative;flex:1;border:1px solid var(--border);border-radius:var(--radius-md);overflow:hidden;background:var(--panel);min-height:280px;}
.editor-wrap.drag-over{border-color:var(--teal);box-shadow:0 0 0 3px rgba(94,234,212,.15);}
textarea{width:100%;height:100%;min-height:280px;resize:vertical;border:none;background:transparent;color:var(--text);font-family:var(--font-mono);font-size:.85rem;line-height:1.6;padding:1rem;outline:none;}
textarea[readonly]{color:var(--text-dim);}
.drop-hint{position:absolute;inset:0;display:none;align-items:center;justify-content:center;background:rgba(94,234,212,.08);font-family:var(--font-mono);font-size:.85rem;color:var(--teal);pointer-events:none;}
.editor-wrap.drag-over .drop-hint{display:flex;}
.field-msg{min-height:1.2em;font-size:.82rem;color:var(--danger);margin:.5rem 0 0;}
.field-meta{font-size:.76rem;color:var(--text-faint);margin:.4rem 0 0;font-family:var(--font-mono);}

.panel-options{display:flex;flex-direction:column;gap:1.1rem;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-md);padding:1.1rem;}
.panel-options fieldset{border:none;margin:0;padding:0;}
.panel-options legend{font-family:var(--font-mono);font-size:.74rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-faint);padding:0 0 .5rem;}
.seg-control{display:flex;flex-direction:column;gap:.35rem;}
.seg-control label{display:flex;align-items:center;gap:.5em;font-size:.85rem;color:var(--text-dim);cursor:pointer;}
.toggle-row{display:flex;align-items:center;gap:.55em;font-size:.83rem;color:var(--text-dim);margin-bottom:.55rem;cursor:pointer;}
.toggle-row:last-child{margin-bottom:0;}
input[type="checkbox"],input[type="radio"]{accent-color:var(--teal);width:15px;height:15px;flex-shrink:0;}

/* ============ RESULTS ============ */
.results-section{scroll-margin-top:80px;}
.results-card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.75rem;box-shadow:var(--shadow);}
.results-status{display:flex;align-items:center;gap:.6em;color:var(--text-faint);font-size:.9rem;margin-bottom:1.2rem;}
.results-status.is-success{color:var(--teal);}
.results-status.is-error{color:var(--danger);}
.results-table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:1.4rem;}
table{width:100%;border-collapse:collapse;font-family:var(--font-mono);font-size:.8rem;}
thead tr{background:var(--panel-2);}
th,td{text-align:left;padding:.6em .9em;border-bottom:1px solid var(--border);white-space:nowrap;color:var(--text-dim);}
th{color:var(--amber);font-weight:600;}
tbody tr:last-child td{border-bottom:none;}
.results-note{padding:.7em .9em 0;font-size:.78rem;color:var(--text-faint);}
.results-actions{display:flex;gap:.9rem;flex-wrap:wrap;}

/* ============ FEATURES ============ */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.25rem;}
.feature-card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-md);padding:1.6rem;transition:border-color .15s,transform .15s;}
.feature-card:hover{border-color:var(--teal-dim);transform:translateY(-3px);}
.feature-icon{font-size:1.4rem;color:var(--teal);margin-bottom:.7rem;}
.feature-card h3{font-size:1.05rem;margin-bottom:.4em;}
.feature-card p{font-size:.88rem;margin:0;}

/* ============ HOW IT WORKS ============ */
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:1.25rem;counter-reset:step;}
.step{background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--radius-md);padding:1.5rem;}
.step-num{font-family:var(--font-mono);font-size:.78rem;color:var(--amber);display:block;margin-bottom:.7rem;}
.step h3{font-size:1rem;margin-bottom:.4em;}
.step p{font-size:.86rem;margin:0;}

/* ============ SEO COPY ============ */
.seo-copy-body{max-width:800px;margin:0 auto;}
.seo-copy-body p{font-size:.95rem;}

/* ============ FAQ ============ */
.faq-list{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:.7rem;}
.faq-item{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-md);padding:0;overflow:hidden;}
.faq-item summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;padding:1.1rem 1.3rem;font-weight:600;font-size:.95rem;}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary svg{color:var(--text-faint);transition:transform .2s;flex-shrink:0;}
.faq-item[open] summary svg{transform:rotate(45deg);}
.faq-item p{padding:0 1.3rem 1.2rem;font-size:.9rem;margin:0;}

/* ============ CTA ============ */
.cta{background:linear-gradient(135deg,var(--teal) 0%,#8ff5e3 100%);border-radius:var(--radius-lg);margin:0 auto 4rem;max-width:1240px;padding:0 1.25rem;}
.cta-inner{padding:3.5rem 2rem;text-align:center;max-width:640px;margin:0 auto;}
.cta-inner h2{color:#06231f;}
.cta-inner p{color:#0d3b32;}
.cta-actions{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;margin-top:1.5rem;}
.cta-inner .btn-primary{background:#06231f;color:var(--teal);}

/* ============ FOOTER ============ */
.site-footer{background:var(--bg-alt);border-top:1px solid var(--border);padding:3.5rem 1.25rem 0;}
.footer-top{max-width:1240px;margin:0 auto;display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:2rem;padding-bottom:2.5rem;}
.footer-brand p{font-size:.85rem;max-width:260px;}
.footer-col h4{font-family:var(--font-mono);font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-faint);margin-bottom:.9rem;}
.footer-col ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.55rem;}
.footer-col a{font-size:.83rem;color:var(--text-dim);}
.footer-col a:hover{color:var(--teal);}
.footer-bottom{max-width:1240px;margin:0 auto;border-top:1px solid var(--border);padding:1.5rem 0 2rem;display:flex;flex-direction:column;gap:.5rem;}
.footer-bottom p{font-size:.78rem;color:var(--text-faint);margin:0;}
.footer-disclaimer{max-width:900px;}

/* ============ COOKIE BANNER ============ */
.cookie-banner{position:fixed;left:1.25rem;right:1.25rem;bottom:1.25rem;max-width:560px;margin:0 auto;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-md);padding:1.1rem 1.3rem;box-shadow:var(--shadow);z-index:200;display:flex;flex-direction:column;gap:.9rem;transform:translateY(140%);transition:transform .35s ease;}
.cookie-banner.is-visible{transform:translateY(0);}
.cookie-banner p{font-size:.82rem;margin:0;color:var(--text-dim);}
.cookie-actions{display:flex;gap:.7rem;justify-content:flex-end;}

/* ============ TOAST ============ */
.toast{position:fixed;bottom:1.25rem;left:50%;transform:translateX(-50%) translateY(20px);background:var(--panel);border:1px solid var(--teal-dim);color:var(--text);padding:.8em 1.3em;border-radius:999px;font-size:.85rem;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:300;}
.toast.is-visible{opacity:1;transform:translateX(-50%) translateY(0);}

/* ============ RESPONSIVE ============ */
@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr;}
  .converter-panel{grid-template-columns:1fr;}
  .panel-options{order:3;}
  .features-grid{grid-template-columns:repeat(2,1fr);}
  .steps{grid-template-columns:repeat(2,1fr);}
  .footer-top{grid-template-columns:1fr 1fr;}
}
@media (max-width:720px){
  .main-nav{position:fixed;top:64px;left:0;right:0;bottom:0;background:var(--bg);padding:1.5rem;overflow-y:auto;transform:translateX(100%);transition:transform .25s ease;border-top:1px solid var(--border);}
  .main-nav.is-open{transform:translateX(0);}
  .main-nav ul{flex-direction:column;align-items:flex-start;gap:0;width:100%;}
  .main-nav li{width:100%;border-bottom:1px solid var(--border);}
  .main-nav a,.nav-drop-btn{padding:1em 0;width:100%;justify-content:space-between;}
  .dropdown{position:static;transform:none;opacity:1;visibility:visible;display:none;box-shadow:none;border:none;background:var(--bg-alt);width:100%;}
  .has-dropdown.is-open .dropdown{display:block;}
  .nav-toggle{display:flex;}
  .nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
  .nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
  .nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
}
@media (max-width:640px){
  section{padding:3rem 0;}
  .hero{padding:2rem 0 2rem;}
  .features-grid,.steps{grid-template-columns:1fr;}
  .footer-top{grid-template-columns:1fr 1fr;gap:1.6rem;}
  .hero-stats{flex-wrap:wrap;gap:1.2rem;}
  .cta-inner{padding:2.5rem 1.3rem;}
}