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.text-button{margin-left:auto;white-space:nowrap;font-size:10px}.history-row{display:flex;align-items:center;justify-content:space-between;gap:20px;border-top:1px solid #304353;padding-top:18px}.history-row a{font:13px monospace;color:var(--blue)}.history-row p{font-size:11px;margin-top:7px}.history-row small{font-size:10px;color:#839eb2}.history-price{text-align:right}.history-price>strong{display:block;font-size:14px;font-weight:500;margin-bottom:12px}.history-price>.badge{font-size:9px}.subtle-count{font:13px monospace;color:#8aa5bb}.account-tip{display:flex;align-items:center;gap:12px;color:#7f9bb0;padding:0 10px}.account-tip p{font-size:11px}.compact-empty{padding:15px 0;text-align:center}.compact-empty p{font-size:13px;color:#c8d8e4}.compact-empty span{font-size:11px;color:var(--muted);display:block;margin:5px 0 15px}.compact-empty a{font-size:12px}.cart-dialog{position:fixed;inset:0 0 0 auto;margin:0;height:100dvh;max-height:100dvh;width:490px;max-width:100vw;padding:0 30px 30px;background:#101923;border:0;border-left:1px solid #3b4c5c;color:var(--text);box-shadow:-20px 0 70px #0005}.cart-dialog[open]{animation:drawer-in .2s ease-out}dialog::backdrop{background:#030911b8;backdrop-filter:blur(4px)}@keyframes drawer-in{from{transform:translateX(100%)}to{transform:translateX(0)}}.cart-head{position:sticky;top:0;background:#101923;display:flex;justify-content:space-between;align-items:center;padding:27px 0 23px;border-bottom:1px solid #32414e;z-index:1}.cart-head .eyebrow{font-size:8px;margin-bottom:8px}.cart-head h2{font-size:26px;letter-spacing:-.8px}.cart-head h2>span{font-size:13px;color:#9bb2c5;vertical-align:middle;padding-left:9px}.cart-empty{min-height:calc(100% - 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30px;gap:10px}.cart-total>span{font-size:13px}.cart-total span span{color:var(--muted);font-size:11px}.cart-total>strong{font-size:24px;letter-spacing:-.7px}.buyer-heading{border-top:1px solid #324654;padding-top:26px;margin-bottom:23px}.buyer-heading h3{font-size:17px;margin-bottom:9px}.buyer-heading p{font-size:11px}.checkout-button{margin-top:25px;gap:7px}.checkout-button .icon{order:2;margin-left:auto}.checkout-button{justify-content:flex-start}.checkout-note{font-size:10px;text-align:center;margin:15px 5px 5px;line-height:1.8}.checkout-note .icon{width:12px;height:12px;margin-right:4px}#cart-limit{margin:20px 0 0;padding:12px}#cart-limit p{font-size:11px}.confirm-dialog{max-width:calc(100vw - 32px);width:410px;padding:30px;border:1px solid #41576b;border-radius:12px;background:#142330;color:var(--text)}.confirm-dialog h2{font-size:24px;letter-spacing:-.5px;margin:20px 0 15px}.confirm-dialog p{font-size:13px}.confirm-icon{color:var(--yellow)}.confirm-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:25px}.toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);z-index:100;background:#dcecff;color:#102a3d;border:1px solid #b5d4ed;border-radius:8px;padding:12px 18px;display:flex;align-items:center;gap:10px;font-size:12px;box-shadow:0 8px 30px #0004;max-width:calc(100vw - 32px);width:max-content}.toast-error{background:#ffdddd;color:#612831;border-color:#e7a7b1}.demo-toggle{position:fixed;bottom:18px;left:18px;display:flex;align-items:center;gap:8px;background:#1c2a37;color:#c5d8e7;border:1px solid #425b70;border-radius:20px;padding:7px 12px;font-size:10px;z-index:35;box-shadow:0 4px 20px #0003}.demo-toggle:hover{background:#293e50}.demo-toggle>.icon{width:14px;height:14px}.demo-toggle-dot{width:4px;height:4px}.demo-panel{position:fixed;bottom:62px;left:18px;width:330px;max-width:calc(100vw - 36px);max-height:calc(100dvh - 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@media(min-width:1440px){.hero{padding-top:92px}.hero h1{font-size:112px}.hero-bottom{margin-block:36px 46px}.waveform-stage{min-height:195px}.hero-trust{padding-top:40px}}
@media(max-width:1100px){.main-nav{gap:18px;margin-right:8px}.header-actions{gap:14px}.hero h1{letter-spacing:-4px}.hero-actions{gap:16px}.hero-login{font-size:11px}.hero-bottom>p{font-size:13px}.plans:has(.plan:nth-child(4)){grid-template-columns:repeat(2,1fr)}.plan-price{font-size:38px}.account-layout{grid-template-columns:1.1fr 1fr}.account-card{padding:21px}.stat{padding-inline:15px}.stat>strong{font-size:18px}}
@media(max-width:850px){.container,.header-inner{width:calc(100% - 48px)}.header-inner{height:78px;gap:20px}.main-nav{display:none}.header-actions{margin-left:auto}.hero{padding-top:58px}.hero h1{font-size:8.7vw;letter-spacing:-3.8px}.hero-bottom{align-items:center}.hero-actions{flex-direction:column;align-items:flex-start;gap:9px}.hero-login span{display:inline}.hero-trust{gap:25px}.section{padding-block:75px}.section-heading h2{font-size:38px}.section-heading>p{font-size:12px}.feature h3{font-size:15px}.feature p{font-size:12px}.feature{padding-right:20px}.feature:nth-child(3n+2){padding-inline:20px}.feature:nth-child(3n){padding-left:20px}.steps{gap:22px}.step{flex-direction:column;gap:19px}.step-number{font-size:32px}.download-card{padding:32px;grid-template-columns:1fr 105px}.download-glyph img{width:100px}.download-copy h2{font-size:36px}.download-actions{gap:9px}.download-actions .button{padding:12px;font-size:11px}.download-actions .button>span{display:none}.payment-layout{grid-template-columns:260px 1fr;gap:28px}.order-panel{padding:25px}.qr-paper{width:252px;height:252px;padding:16px}.qr-paper img{width:220px;height:220px}.transfer-details>div{display:block}.transfer-details dd{margin-top:5px;justify-content:space-between}.transfer-amount strong{font-size:35px}.account-stats{grid-template-columns:1fr 1fr}.stat:nth-child(2){border-right:0}.stat:nth-child(-n+2){border-bottom:1px solid #344453}.account-layout{grid-template-columns:1fr}.account-side{display:grid;grid-template-columns:1fr 1fr;gap:16px}.account-tip{grid-column:1/-1}.device-row{flex-wrap:wrap}.device-row .text-button{margin-left:0}.card-heading h2{font-size:17px}.history-row{gap:10px}.plans:has(.plan:nth-child(3)){grid-template-columns:repeat(2,1fr)}.plans:has(.plan:nth-child(3):last-child) .plan:last-child{grid-column:1/-1}}
@media(max-width:600px){html{scroll-padding-top:88px}.container,.header-inner{width:calc(100% - 40px)}.header-inner{height:73px;gap:12px}.brand{gap:7px}.brand img{width:27px;height:31px}.brand-name{font-size:22px;letter-spacing:-1px}.brand-slogan{font-size:5.3px;letter-spacing:.8px;margin-top:4px}.header-actions{gap:13px}.desktop-login{display:none}.mobile-login{display:inline}.header-login{font-size:11px}.button-cart{padding:7px 9px;gap:6px;min-height:35px}.cart-label{display:none}.cart-count{width:17px;min-width:17px;height:17px;font-size:9px}.hero{padding-top:44px}.hero-eyebrow{font-size:7.5px;letter-spacing:1.05px;gap:7px}.status-dot{width:5px;height:5px}.hero h1{font-size:clamp(34px,8.7vw,52px);letter-spacing:-1.65px;line-height:1.1;margin-block:23px}.hero-bottom{display:block;margin:22px 0 30px}.hero-bottom>p{font-size:12px;line-height:1.9;max-width:330px}.desktop-break{display:none}.hero-actions{display:flex;flex-direction:row;align-items:center;margin-top:22px;gap:20px}.hero-actions>.button{min-height:43px;min-width:117px;padding:11px 15px;font-size:12px}.hero-login{font-size:10px;line-height:1.9}.hero-login span{display:block}.sound-showcase{padding:16px 14px 0;border-radius:8px}.showcase-top{gap:9px}.showcase-file{font-size:9px;gap:6px}.showcase-file>.icon{width:14px;height:14px}.file-spec{display:none}.showcase-top .badge{font-size:8px;padding:4px 6px;gap:3px}.showcase-top .badge .icon{width:10px;height:10px}.waveform-stage{gap:6px;min-height:132px;padding:20px 0 35px}.wave-time{font-size:6px}.waveform{height:90px}.wave-marker{top:28px;bottom:25px;left:59%}.marker-label{font-size:5.5px;letter-spacing:.5px;padding:3px 6px}.showcase-bottom{flex-direction:column-reverse;align-items:flex-start;gap:15px;padding:13px 0 15px}.recipient{width:100%;font-size:10px}.recipient-check{margin-left:auto}.recipient small{font-size:5.5px}.recipient-id{font-size:8px;margin-left:4px}.recipient-avatar{width:27px;height:27px}.showcase-security{font-size:8px;gap:6px}.showcase-security .icon{width:11px;height:11px}.showcase-caption{font-size:5.5px;bottom:-18px}.hero-trust{flex-wrap:wrap;gap:13px 20px;justify-content:flex-start;padding:29px 0 0;font-size:8px}.hero-trust .icon{width:12px;height:12px}.hero-trust>span{gap:5px}.section-features{margin-top:46px}.section{padding-block:55px}.section-heading{display:block;margin-bottom:30px}.section-heading h2,h2{font-size:33px;letter-spacing:-1px}.section-heading>p{font-size:12px;line-height:1.8;margin-top:18px}.eyebrow{font-size:8px;letter-spacing:1.6px;margin-bottom:15px}.feature-grid{grid-template-columns:1fr}.feature,.feature:nth-child(3n+2),.feature:nth-child(3n),.feature:nth-child(-n+3){border:0;padding:24px 0;border-bottom:1px solid #2c3a47}.feature:first-child{padding-top:0}.feature:last-child{padding-bottom:0;border-bottom:0}.feature-icon{width:35px;height:35px;float:left;margin:0 16px 0 0;border-radius:8px}.feature h3{font-size:15px;padding-top:7px;margin-bottom:12px}.feature p{margin-left:51px;font-size:12px;max-width:none;line-height:1.85}.feature-icon>.icon{width:19px;height:19px}.steps{grid-template-columns:1fr;gap:27px;margin-top:34px}.step{flex-direction:row;gap:20px}.step-number{font-size:30px;width:34px;flex-shrink:0}.step h3{font-size:15px;margin-bottom:8px}.step p{font-size:12px}.section-heading-center>p:last-child{font-size:12px;max-width:260px;margin:15px auto 0}.plans,.plans:has(.plan:nth-child(3)),.plans:has(.plan:nth-child(4)){grid-template-columns:1fr;gap:18px}.plan{padding:25px}.plan-heading h3{font-size:21px}.plan-price{font-size:42px}.plan-description{font-size:11px}.plan li{font-size:12px}.pricing-note{font-size:9px;line-height:1.9;margin-top:22px;align-items:flex-start;padding-inline:6px}.pricing-note>.icon{margin-top:3px}.download-card{padding:26px 23px;display:block;overflow:hidden}.download-glyph{display:none}.download-copy h2{font-size:31px}.version{font-size:8px;letter-spacing:1px}.download-copy>p{font-size:12px}.download-actions{display:grid;gap:10px}.download-actions .button{font-size:12px}.download-actions .button>span{display:inline;font-size:10px}.download-notice{margin-top:26px;padding-top:20px;gap:9px}.download-notice p{font-size:9px}.footer-inner{min-height:145px;flex-wrap:wrap;justify-content:space-between;gap:9px;padding-block:22px 44px}.footer-inner>p{font-size:9px;order:3;width:100%;max-width:285px;line-height:1.9}.footer-inner>span{font-size:10px}.footer-inner>a{width:25px;height:25px}.order-page,.account-page{padding-block:27px 60px;min-height:calc(100vh - 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26px)}.error-card{margin-block:30px 60px;padding-inline:15px;min-height:370px}.empty-state h1,.empty-state h2{font-size:25px}.empty-state>p{font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}.spinner{border-style:dotted}}

/* Giao diện kính sáng — màu trung tính, xanh hệ thống, bo góc mềm. */
:root{color-scheme:light;--bg:#f5f5f7;--surface:#fff;--surface-raised:#f0f3f8;--border:#d9dce2;--text:#1d1d1f;--muted:#62666e;--blue:#0071e3;--blue-hover:#0077ed;--green:#217442;--red:#b42332;--yellow:#855c00;--radius:24px;--font:-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif}
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white}.button-cart:hover{background:#e0e8f2}.button:disabled{background:#e2e4e9;border-color:#d5d8dd;color:#737780;opacity:1}.button:disabled:hover{transform:none}.text-button,.copy-button{color:#0066cc}.icon-button{color:#606672;border-radius:50%}.icon-button:hover{background:#e3e9f0;color:#1d1d1f}.eyebrow{color:#0066cc}.skip-link{background:#0071e3;color:white}.site-header{background:#fafafacc;border-bottom:1px solid #d6d8de80;backdrop-filter:blur(24px) saturate(180%);-webkit-backdrop-filter:blur(24px) saturate(180%)}.header-inner{height:76px;max-width:1200px}.brand-name{font-weight:650;font-size:26px;color:#24262b}.brand-domain{color:#5d6672}.brand-slogan{color:#687380}.main-nav{color:#464c56;font-size:12px}.header-login{color:#353c46}.cart-count{background:#0071e3;color:white;border-radius:50%}.hero{padding-top:76px;position:relative}.hero-eyebrow{justify-content:center;font-size:10px;color:#596675;letter-spacing:1.4px}.status-dot{background:#0071e3;box-shadow:none}.hero 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p{color:#7c8fa2}.quantity-control{background:#fff8;border-color:#cddae8;border-radius:999px;overflow:hidden}.quantity-button{color:#587a99}.quantity-button:hover{background:#dfedfb}.quantity-control output{color:#385b7a}.cart-total>strong{color:#2d4963}.cart-total span span{color:#8395a6}.buyer-heading{border-color:#d8e3ed}.buyer-heading h3{color:#324d67}.buyer-heading p{color:#7a8fa1}.checkout-note{color:#788fa2}.confirm-dialog{background:#f5f9fff0;color:#2c455e;border-color:#fff;border-radius:26px;box-shadow:0 30px 100px #243c5730;backdrop-filter:blur(30px)}.confirm-dialog p{color:#798b9e}dialog::backdrop{background:#28394f3d;backdrop-filter:blur(7px);-webkit-backdrop-filter:blur(7px)}.toast{background:#fffffff2;color:#37536e;border-color:white;border-radius:999px;box-shadow:0 8px 35px #1b355c20;backdrop-filter:blur(25px)}.toast-error{background:#fff1f2f5;color:#a33c49;border-color:#f5d9df}.demo-toggle{background:#ffffffc7;color:#466785;border-color:#ffffff;border-radius:999px;box-shadow:0 3px 18px #263c5717;backdrop-filter:blur(20px)}.demo-toggle:hover{background:#fff}.demo-toggle-dot{background:#0071e3;box-shadow:none}.demo-panel{background:#f5f9fff2;border-color:#fff;border-radius:23px;box-shadow:0 15px 70px #1b365d25;backdrop-filter:blur(35px);color:#334d67}.demo-head{border-color:#d3dfed}.demo-head small{color:#7b8fa4}.demo-panel>label,.demo-section-label{color:#667f99}.demo-panel select{background:#ffffffb3;color:#365572;border-color:#cad9e8;border-radius:9px;padding:10px}.demo-button{background:#ffffffb0;color:#52738f;border-color:#d0deec;border-radius:9px}.demo-button:hover{background:#e5f1ff;border-color:#91bde8}.demo-head .icon-button:hover{background:#e1ecf8}
@media(min-width:1440px){.hero h1{font-size:104px}.hero{padding-top:88px}}
@media(max-width:1100px){.feature,.feature:nth-child(3n+2),.feature:nth-child(3n),.feature:nth-child(-n+3){padding:24px}.plan{padding:27px}.hero h1{letter-spacing:-4px}}
@media(max-width:850px){.hero{padding-top:59px}.hero h1{font-size:8.4vw;letter-spacing:-3.7px}.hero-actions{flex-direction:row;align-items:center}.hero-bottom>p{font-size:15px}.feature-grid{gap:14px}.feature,.feature:nth-child(3n+2),.feature:nth-child(3n),.feature:nth-child(-n+3){padding:21px;border-radius:21px}.feature h3{font-size:15px}.feature p{font-size:12px}.download-card{padding:35px;grid-template-columns:1fr 110px}.download-glyph{width:105px;height:105px;border-radius:28px}.download-glyph img{width:72px;height:72px}.stat:nth-child(-n+2){border-color:#e1e7ee}.section-heading h2{font-size:38px}}
@media(max-width:600px){.header-inner{height:70px}.brand-name{font-size:22px}.hero{padding-top:47px}.hero-eyebrow{font-size:7px;letter-spacing:1px}.hero h1{font-size:9.15vw;letter-spacing:-1.8px;margin-block:25px;line-height:1.06}.hero-bottom{margin:24px 0 33px;gap:22px}.hero-bottom>p{font-size:13px;max-width:330px;margin:auto}.hero-actions{justify-content:center;gap:18px;margin-top:23px}.hero-login{font-size:10px}.hero-login span{display:block;margin:0}.hero-actions>.button{min-width:117px;min-height:42px}.sound-showcase{padding:17px 15px 0;border-radius:20px}.sound-showcase:before{inset:-20px -10px}.showcase-file{font-size:9px}.waveform-stage{min-height:132px}.marker-label{font-size:5.5px;letter-spacing:.5px;padding:4px 7px}.showcase-security{font-size:8px}.recipient{font-size:10px}.hero-trust{font-size:8px;justify-content:center;gap:13px 17px;padding-top:31px}.hero-trust .icon{width:12px;height:12px}.section-features{margin-top:47px}.section-heading h2,h2{font-size:33px;letter-spacing:-1.1px}.feature-grid{gap:14px}.feature,.feature:nth-child(3n+2),.feature:nth-child(3n),.feature:nth-child(-n+3){padding:23px 20px;border:1px solid #edeff2;border-radius:23px}.feature h3{font-size:15px}.feature p{font-size:12px;line-height:1.85}.feature-icon{border-radius:11px}.plan{padding:27px;border-radius:24px}.plan-heading h3{font-size:22px}.plan-price{font-size:42px}.plan-description{font-size:11px}.download-card{padding:28px 23px;border-radius:26px}.download-copy h2{font-size:31px;letter-spacing:-1px}.download-notice p{font-size:9px}.download-copy>p{font-size:12px}.footer-inner>p{color:#7a838e}.order-panel{border-radius:22px;padding:22px 18px}.transfer-column{border-color:#dce5ef}.transfer-details dt{font-size:10px}.transfer-details dd{font-size:10px}.license-key{font-size:14px}.login-card{padding:30px 24px;border-radius:27px}.login-card h1{font-size:24px}.login-card>p{font-size:11px}.login-footer a{display:block}.account-stats{border-radius:21px}.stat>strong{font-size:16px}.account-card{border-radius:21px}.card-heading h2{font-size:17px}.field input{font-size:16px}.cart-dialog{border-radius:0}.cart-head{background:#f7fafff5}.toast{border-radius:19px}.confirm-dialog{border-radius:24px}.demo-panel{border-radius:21px}}
/* Giữ sóng âm trong khung trên màn hình nhỏ; tăng tương phản chữ phụ. */
.waveform{min-width:0;flex:1}.wave-time{flex-shrink:0}#main:focus{outline:none}.field label>span,.field input::placeholder,.hint,.card-heading p,.device-row p,.history-row small,.stat>small,.stat>span,.order-buyer,.payment-note,.qr-column .hint,.safe-note,.checkout-note,.buyer-heading p,.download-notice p,.footer-inner>p,.plan-description,.plan-price small,.pricing-note,.account-tip p,.login-card>.hint{color:#657383}.transfer-details dt,.sample-notice,.cart-row-copy p,.renew-option small,.compact-empty span,.demo-head small{color:#62768b}.hero-login{color:#626f7e}.showcase-security,.recipient small,.recipient-id,.wave-time{color:#5f7489}.feature p{color:#616b77}.plan-kicker{color:#657383}.section-heading>p{color:#686f79}.toast{font-size:12px}
@media(max-width:600px){.field label{font-size:12px}.field label>span{font-size:10px}.transfer-details dt,.transfer-details dd{font-size:11px}.order-buyer,.qr-column .hint,.payment-note,.buyer-heading p{font-size:11px}.order-head>.badge{margin-top:0}.order-head{align-items:center}.hero h1{font-size:9vw}.showcase-file{font-size:9px}}

/* Graphite / kính tối. Font được đóng gói cục bộ, không dùng CDN. */
@font-face{font-family:"Inter Local";src:url("assets/inter-vietnamese.woff2") format("woff2");font-style:normal;font-weight:100 900;font-display:swap}
:root{color-scheme:dark;--bg:#000;--surface:#161617;--surface-raised:#212123;--border:#343437;--text:#f5f5f7;--muted:#a1a1a6;--blue:#2997ff;--blue-hover:#4aa7ff;--green:#84d49c;--red:#ff9b9b;--yellow:#efcd80;--font:"Inter Local",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
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@media(min-width:1440px){.hero h1{font-size:100px}}
@media(max-width:850px){.hero{padding-top:60px}.hero h1{font-size:8vw;letter-spacing:-3px}.hero-bottom>p{font-size:15px}.stat:nth-child(-n+2){border-color:#3a3a40}}
@media(max-width:600px){.hero{padding-top:48px}.hero-eyebrow{font-size:6.7px;letter-spacing:1px}.hero h1{font-size:8.5vw;letter-spacing:-1.5px;line-height:1.1}.hero-bottom>p{font-size:12px}.hero-login{font-size:10px}.feature,.feature:nth-child(3n+2),.feature:nth-child(3n),.feature:nth-child(-n+3){border-color:#ffffff06}.transfer-column{border-color:#3a3a40}.cart-head{background:#1d1d20f5}.footer-inner>p{color:#a1a1a6}.section-heading h2{font-size:32px;letter-spacing:-1.5px}.download-copy h2{letter-spacing:-1.3px}}