:root{--ink:#111827;--muted:#5b6474;--line:#dce3ec;--bg:#f5f8fc;--card:#fff;--accent:#0284c7;--accent2:#38bdf8;--radius:22px;--shadow:0 18px 50px rgba(15,23,42,.09)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:#fff;line-height:1.65}a{color:inherit}.container{width:min(1120px,calc(100% - 40px));margin:auto}.narrow{width:min(820px,calc(100% - 40px))}.skip-link{position:absolute;left:-9999px}.skip-link:focus{left:20px;top:20px;z-index:100;background:#fff;padding:10px}.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);border-bottom:1px solid rgba(220,227,236,.8)}.header-inner{height:72px;display:flex;align-items:center;gap:30px}.brand{display:flex;align-items:center;gap:10px;font-weight:800;text-decoration:none;font-size:20px}.brand span span{color:var(--accent)}.brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:var(--ink);color:#fff;font-size:13px}.main-nav{display:flex;gap:24px;margin-left:auto}.main-nav a{text-decoration:none;color:var(--muted);font-weight:650}.main-nav a:hover{color:var(--ink)}.lang-switch{display:flex;border:1px solid var(--line);padding:3px;border-radius:10px}.lang-switch a{text-decoration:none;padding:5px 9px;border-radius:7px;font-size:12px;font-weight:800;color:var(--muted)}.lang-switch .active{background:var(--ink);color:#fff}.hero{padding:86px 0 70px;background:radial-gradient(circle at 80% 10%,#e0f2fe 0,transparent 35%),linear-gradient(180deg,#f8fbff,#fff)}.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;align-items:center;gap:70px}.eyebrow{font-size:12px;letter-spacing:.14em;font-weight:850;color:var(--accent);margin:0 0 12px}.hero h1,.page-hero h1{font-size:clamp(40px,6vw,68px);line-height:1.06;letter-spacing:-.045em;margin:0 0 24px}.hero-lead,.page-intro{font-size:19px;color:var(--muted);max-width:700px}.trust-list{display:flex;flex-wrap:wrap;gap:18px;margin-top:28px;color:#344054;font-weight:650}.visual-card{min-height:330px;border-radius:32px;background:var(--ink);color:#fff;display:grid;place-items:center;box-shadow:var(--shadow);transform:rotate(2deg);position:relative;overflow:hidden}.visual-card:before{content:"";position:absolute;width:280px;height:280px;border-radius:50%;background:var(--accent);filter:blur(90px);opacity:.55}.wave{height:120px;display:flex;align-items:center;gap:10px;position:relative}.wave i{display:block;width:10px;border-radius:20px;background:linear-gradient(var(--accent2),#fff);animation:pulse 1.4s ease-in-out infinite}.wave i:nth-child(1),.wave i:nth-child(7){height:35px}.wave i:nth-child(2),.wave i:nth-child(6){height:70px}.wave i:nth-child(3),.wave i:nth-child(5){height:105px}.wave i:nth-child(4){height:75px}@keyframes pulse{50%{transform:scaleY(.55)}}.visual-text{position:absolute;bottom:28px;font-weight:800;letter-spacing:.08em}.visual-text b{color:var(--accent2);margin:0 8px}.tool-section{padding:20px 0 90px}.tool-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:34px;box-shadow:var(--shadow)}.tool-head{display:flex;justify-content:space-between;gap:20px;align-items:start;margin-bottom:24px}.tool-head h2,.section-title h2{font-size:clamp(28px,4vw,42px);line-height:1.15;margin:0}.privacy-chip{font-size:13px;background:#ecfdf3;color:#067647;padding:7px 11px;border-radius:99px;font-weight:750}.tool-card label{font-weight:750;display:block}.tool-card textarea,.tool-card select,.contact-form input,.contact-form textarea{width:100%;border:1px solid var(--line);border-radius:14px;background:#fbfdff;padding:14px 16px;font:inherit;color:var(--ink);outline:none}.tool-card textarea{min-height:170px;resize:vertical;margin-top:8px;font-size:17px}.tool-card textarea:focus,.tool-card select:focus,.contact-form input:focus,.contact-form textarea:focus{border-color:var(--accent);box-shadow:0 0 0 4px rgba(2,132,199,.11)}.counter{text-align:right;color:var(--muted);font-size:13px;margin-top:5px}.control-grid{display:grid;grid-template-columns:2fr 1fr;gap:18px;margin-top:20px}.control-grid select{margin-top:8px}.tool-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}.button{display:inline-flex;justify-content:center;align-items:center;gap:7px;border-radius:12px;padding:12px 18px;border:1px solid transparent;font-weight:800;text-decoration:none;cursor:pointer;font:inherit}.button.primary{background:var(--ink);color:#fff}.button.primary:hover{background:#253043}.button.secondary{background:#e0f2fe;color:#075985}.button.ghost{background:#fff;border-color:var(--line);color:var(--muted)}.button.disabled{pointer-events:none;opacity:.45}.tool-note{color:var(--muted);font-size:14px;margin:18px 0 0}.tool-card audio{width:100%;margin-top:18px}.steps,.faq-section{padding:90px 0;background:var(--bg)}.section-title{text-align:center;max-width:750px;margin:0 auto 42px}.step-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.step-grid article{background:#fff;border:1px solid var(--line);border-radius:18px;padding:26px}.step-grid b{display:grid;place-items:center;width:38px;height:38px;border-radius:11px;background:#e0f2fe;color:#0369a1}.step-grid h3{font-size:20px;margin:16px 0 8px}.step-grid p{color:var(--muted);margin:0}.content-section,.document-section{padding:80px 0}.prose{font-size:17px}.prose h2{font-size:32px;line-height:1.2;margin:46px 0 14px}.prose h3{font-size:23px;margin:32px 0 10px}.prose p,.prose li{color:#374151}.prose a{color:#0369a1}.faq-list{max-width:820px;margin:auto}.faq-list details{background:#fff;border:1px solid var(--line);border-radius:14px;margin:12px 0;padding:0 20px}.faq-list summary{cursor:pointer;font-weight:800;padding:18px 0;display:flex;justify-content:space-between}.faq-list details p{color:var(--muted);margin:0 0 18px}.page-hero{padding:80px 0 55px;background:var(--bg)}.page-hero h1{font-size:clamp(38px,5vw,58px)}.contact-form{display:grid;gap:16px;margin-top:32px}.contact-form label{display:grid;gap:7px;font-weight:750}.hp-field{position:absolute!important;left:-9999px!important}.form-notice{padding:14px;border-radius:10px}.is-ok{background:#ecfdf3}.is-error{background:#fef2f2}.site-footer{background:var(--ink);color:#d5dbea;padding:60px 0 25px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:50px}.footer-brand{font-size:23px;font-weight:850;color:#fff}.footer-grid p{max-width:420px;color:#9ca3af}.footer-grid nav{display:grid;align-content:start;gap:9px}.footer-grid nav strong{color:#fff;margin-bottom:5px}.footer-grid nav a{text-decoration:none;color:#b6bfcc}.copyright{border-top:1px solid #2d3748;margin-top:40px;padding-top:22px;color:#8f9bad;font-size:14px}.simple-home{padding:120px 0;text-align:center}@media(max-width:780px){.container,.narrow{width:min(100% - 24px,1120px)}.main-nav{display:none}.header-inner{gap:12px}.lang-switch{margin-left:auto}.hero{padding-top:55px}.hero-grid{grid-template-columns:1fr;gap:36px}.visual-card{min-height:250px}.tool-card{padding:22px}.tool-head{display:block}.privacy-chip{display:inline-block;margin-top:15px}.control-grid,.step-grid,.footer-grid{grid-template-columns:1fr}.tool-actions .button{flex:1}.footer-grid{gap:30px}}

/* ToolCMS V2 additions */
.home-language-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:28px}
.related-section{padding:72px 0;background:#f8fafc}
.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.related-card{display:flex;flex-direction:column;gap:8px;padding:22px;border:1px solid #e2e8f0;border-radius:18px;background:#fff;color:#111827;text-decoration:none;box-shadow:0 8px 24px rgba(15,23,42,.05)}
.related-card:hover{transform:translateY(-2px);border-color:#93c5fd}
.related-card span{color:#64748b;font-size:.94rem;line-height:1.6}
.playing[disabled],button[disabled]{opacity:.65;cursor:wait}
@media (max-width:800px){.related-grid{grid-template-columns:1fr}.main-nav{display:none}}

/* SoundOfText tool upgrade: upload, multi text, same-origin audio, history */
.tool-tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin:-4px 0 24px}
.tool-tab{appearance:none;border:0;background:transparent;color:var(--muted);font:inherit;font-weight:750;padding:12px 14px;cursor:pointer;border-bottom:2px solid transparent}
.tool-tab.active{color:var(--accent);border-bottom-color:var(--accent)}
.tool-panel[hidden]{display:none!important}
.input-heading{display:flex;justify-content:space-between;align-items:center;gap:18px}
.switch-label{display:flex!important;align-items:center;gap:8px;color:var(--muted);font-size:13px;font-weight:650!important;cursor:pointer}
.switch-label input{position:absolute;opacity:0;pointer-events:none}
.switch-ui{position:relative;width:34px;height:20px;border-radius:999px;background:#d1d5db;transition:.2s}
.switch-ui:after{content:"";position:absolute;width:14px;height:14px;border-radius:50%;background:#fff;top:3px;left:3px;box-shadow:0 1px 4px rgba(15,23,42,.25);transition:.2s}
.switch-label input:checked+.switch-ui{background:var(--accent)}
.switch-label input:checked+.switch-ui:after{transform:translateX(14px)}
.multi-hint{margin:7px 0 0;color:var(--muted);font-size:13px}
.upload-zone{min-height:190px;border:1.5px dashed #b8c5d6;border-radius:18px;background:#f8fbff;display:flex!important;flex-direction:column;align-items:center;justify-content:center;gap:7px;text-align:center;padding:28px;cursor:pointer;color:var(--muted)}
.upload-zone:hover{border-color:var(--accent);background:#f0f9ff}
.upload-zone strong{color:var(--ink);font-size:17px}
.upload-zone input{position:absolute;opacity:0;pointer-events:none}
.upload-icon{display:grid;place-items:center;width:52px;height:52px;border-radius:14px;background:#e0f2fe;color:#0369a1;font-size:12px;font-weight:900;letter-spacing:.08em}
.upload-name{min-height:24px;margin:10px 0 0;color:var(--muted);font-size:13px;text-align:center}
.history-card{margin-top:28px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow)}
.history-head{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}
.history-head h2{font-size:clamp(26px,3vw,36px);margin:0;line-height:1.15}
.history-count{display:grid;place-items:center;min-width:36px;height:36px;padding:0 10px;border-radius:999px;background:#e0f2fe;color:#075985;font-weight:850}
.history-actions{display:flex;flex-wrap:wrap;gap:9px;margin:22px 0}
.button.compact{padding:9px 13px;font-size:14px}
.button.danger{background:#fff1f2;color:#be123c;border-color:#fecdd3}
.history-list{display:grid;gap:12px}
.history-item{display:grid;grid-template-columns:minmax(0,1fr) minmax(300px,480px);align-items:center;gap:18px;border:1px solid var(--line);border-radius:15px;padding:16px 18px;background:#fbfdff}
.history-copy{min-width:0}
.history-meta{display:flex;gap:9px;align-items:center;margin-bottom:6px;font-size:11px;text-transform:uppercase;letter-spacing:.045em}
.history-meta strong{color:var(--accent)}
.history-meta span{color:var(--muted);text-transform:none;letter-spacing:0}
.history-copy p{margin:0;color:#334155;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.history-controls{display:grid;grid-template-columns:minmax(0,1fr) auto auto;align-items:center;gap:8px;min-width:0}
.history-controls audio{display:block;width:100%;min-width:240px;height:40px;margin:0}
.icon-button{display:grid;place-items:center;width:38px;height:38px;border:1px solid var(--line);border-radius:10px;background:#fff;color:#475569;font:inherit;font-weight:850;cursor:pointer}
.icon-button:hover{border-color:#93c5fd;color:#0369a1}
.history-empty{text-align:center;color:var(--muted);padding:22px 0;margin:0}
@media(max-width:780px){
  .input-heading{align-items:flex-start}
  .history-card{padding:20px}
  .history-item{grid-template-columns:1fr}
  .history-controls{grid-template-columns:minmax(0,1fr) auto auto}
  .history-actions .button{flex:1 1 calc(50% - 9px)}
}
@media(max-width:480px){
  .history-controls{grid-template-columns:minmax(0,1fr) auto auto}
  .history-controls audio{min-width:0}
  .tool-tabs{overflow:auto}
  .tool-tab{white-space:nowrap}
}
/* Responsive images inside article content */
.prose figure {
    width: 100%;
    max-width: 100%;
    margin: 28px auto;
    text-align: center;
}

.prose figure img,
.prose > img,
.prose p img {
    display: block;
    width: auto;
    max-width: 100%;
    height: auto;
    margin-left: auto;
    margin-right: auto;
    object-fit: contain;
}

.prose figcaption {
    margin-top: 8px;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.5;
    text-align: center;
}

/* Prevent content from forcing the page wider than the screen */
.prose {
    min-width: 0;
    overflow-wrap: anywhere;
}

.content-section,
.document-section,
.container,
.narrow {
    min-width: 0;
}

@media (max-width: 780px) {
    .prose figure {
        margin: 22px auto;
    }

    .prose figure img,
    .prose > img,
    .prose p img {
        width: 100%;
        max-width: 100%;
        height: auto;
    }
}

/* =========================================================
   SoundOfText language dropdown
   Custom visible scrollbar independent of Windows/Chrome
   ========================================================= */

.language-field {
    min-width: 0;
}

.language-field-label {
    display: block;
    font-weight: 750;
}

.language-select {
    position: relative;
    width: 100%;
    margin-top: 8px;
}

.language-select-button {
    width: 100%;
    min-height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 13px 18px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fbfdff;
    color: var(--ink);
    font: inherit;
    font-weight: 750;
    text-align: left;
    cursor: pointer;
    outline: none;
}

.language-select-button:hover {
    border-color: #93c5fd;
}

.language-select-button:focus-visible,
.language-select.open .language-select-button {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(2, 132, 199, .11);
}

.language-select-arrow {
    flex: 0 0 auto;
    font-size: 18px;
    line-height: 1;
    transition: transform .2s ease;
}

.language-select.open .language-select-arrow {
    transform: rotate(180deg);
}

.language-dropdown {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 8px);
    z-index: 1000;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    box-shadow: 0 20px 55px rgba(15, 23, 42, .18);
}

.language-dropdown[hidden] {
    display: none !important;
}

.language-search-wrap {
    position: relative;
    z-index: 2;
    padding: 12px;
    border-bottom: 1px solid var(--line);
    background: #fff;
}

.language-search {
    width: 100%;
    height: 44px;
    padding: 10px 13px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #f8fafc;
    color: var(--ink);
    font: inherit;
    outline: none;
}

.language-search:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(2, 132, 199, .1);
}

/*
 * JS tự bọc #languageList bằng .language-scroll-area và tạo
 * .language-scrollbar + .language-scroll-thumb.
 */
.language-scroll-area {
    position: relative;
    height: 330px;
    max-height: 330px;
    overflow: hidden;
    border-radius: 0 0 14px 14px;
    background: #fff;
}

.language-list {
    width: 100%;
    height: 100%;
    max-height: none;
    padding-right: 20px;
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.language-list::-webkit-scrollbar {
    width: 0;
    height: 0;
    display: none;
}

.language-scrollbar {
    position: absolute;
    z-index: 6;
    top: 7px;
    right: 5px;
    bottom: 7px;
    width: 12px;
    border-radius: 999px;
    background: #e2e8f0;
    cursor: pointer;
    user-select: none;
    touch-action: none;
}

.language-scroll-thumb {
    position: absolute;
    top: 0;
    left: 2px;
    width: 8px;
    min-height: 44px;
    border-radius: 999px;
    background: #64748b;
    cursor: grab;
    transition: background-color .15s ease;
    will-change: transform;
}

.language-scroll-thumb:hover {
    background: #475569;
}

.language-scroll-thumb.dragging {
    background: #334155;
    cursor: grabbing;
}

.language-scrollbar.is-hidden {
    display: none;
}

.language-option {
    width: 100%;
    display: block;
    padding: 11px 16px;
    border: 0;
    background: #fff;
    color: var(--ink);
    font: inherit;
    text-align: left;
    cursor: pointer;
}

.language-option:hover,
.language-option:focus-visible {
    background: #f1f5f9;
    outline: none;
}

.language-option.selected {
    background: #e0f2fe;
    color: #0369a1;
    font-weight: 800;
}

.language-option[hidden] {
    display: none !important;
}

@media (max-width: 780px) {
    .language-dropdown {
        position: fixed;
        left: 12px;
        right: 12px;
        top: 86px;
        bottom: 16px;
        width: auto;
        display: flex;
        flex-direction: column;
        overflow: hidden;
    }

    .language-search-wrap {
        flex: 0 0 auto;
    }

    .language-scroll-area {
        flex: 1 1 auto;
        height: auto;
        max-height: none;
        min-height: 0;
    }

    .language-list {
        height: 100%;
        max-height: none;
    }
}