:root{color-scheme:light dark;--bg:#f5f6fb;--bg-glow-1:rgba(99, 102, 241, 0.16);--bg-glow-2:rgba(6, 182, 212, 0.12);--surface:#ffffff;--surface-2:#f8f9fd;--surface-3:#eef1f9;--text:#101321;--text-soft:#414858;--muted:#646c7e;--border:rgba(16, 19, 33, 0.10);--border-strong:rgba(16, 19, 33, 0.18);--brand:#4f46e5;--brand-2:#7c3aed;--accent:#0891b2;--btn-1:#4f46e5;--btn-2:#7c3aed;--btn-3:#0891b2;--brand-soft:rgba(99, 102, 241, 0.10);--success:#047857;--success-soft:rgba(4, 120, 87, 0.10);--danger:#b91c1c;--danger-soft:rgba(185, 28, 28, 0.09);--warning:#b45309;--warning-soft:rgba(180, 83, 9, 0.10);--shadow-sm:0 1px 2px rgba(16, 19, 33, 0.05);--shadow-md:0 14px 34px -18px rgba(16, 19, 33, 0.30);--shadow-lg:0 30px 70px -32px rgba(16, 19, 33, 0.38);--radius-sm:10px;--radius-md:16px;--radius-lg:24px;--radius-xl:30px;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", "Helvetica Neue",
    Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Hiragino Sans",
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0.9)}}*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 18px);-webkit-text-size-adjust:100%}body{margin:0;font-family:var(--font-sans);font-size:16px;line-height:1.65;color:var(--text);background:radial-gradient(1100px 520px at 78% -8%,var(--bg-glow-1),transparent 62%),radial-gradient(900px 460px at 8% 4%,var(--bg-glow-2),transparent 58%),var(--bg);min-height:100vh;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}img,svg,canvas{display:block;max-width:100%}[hidden]{display:none!important}h1,h2,h3,h4{margin:0 0 .5em;line-height:1.13;letter-spacing:-.025em;font-weight:700;color:var(--text)}h1{font-size:clamp(2.4rem,5.2vw,4rem);letter-spacing:-.035em}h2{font-size:clamp(1.75rem,3.2vw,2.5rem);letter-spacing:-.03em}h3{font-size:1.13rem;letter-spacing:-.015em}p{margin:0 0 1em}p:last-child{margin-bottom:0}a{color:var(--brand);text-decoration-thickness:.08em;text-underline-offset:.18em}a:hover{color:var(--brand-2)}button,input,select{font:inherit;color:inherit}button{cursor:pointer}::selection{background:var(--brand);color:#fff}:focus-visible{outline:3px solid var(--brand);outline-offset:3px;border-radius:4px}.wrap{width:min(100% - 40px,var(--wrap));margin-inline:auto}.wrap-narrow{max-width:780px}.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.skip-link{position:fixed;top:10px;left:10px;z-index:200;padding:10px 16px;border-radius:10px;background:var(--surface);border:1px solid var(--border-strong);box-shadow:var(--shadow-md);transform:translateY(-160%);transition:transform .15s ease}.skip-link:focus{transform:translateY(0);color:var(--text)}.icon{width:1.2em;height:1.2em;flex:none;vertical-align:-.18em}.icon-sprite{position:absolute;width:0;height:0;overflow:hidden}.button{--btn-bg:linear-gradient(135deg, var(--btn-1) 0%, var(--btn-2) 55%, var(--btn-3) 120%);display:inline-flex;align-items:center;justify-content:center;gap:.55em;padding:.72em 1.2em;border:1px solid transparent;border-radius:999px;background:var(--btn-bg);color:#fff;font-weight:600;font-size:.98rem;line-height:1.2;text-decoration:none;box-shadow:0 10px 26px -14px rgba(79,70,229,.75);transition:transform .15s ease,box-shadow .15s ease,filter .15s ease}.button:hover{color:#fff;filter:saturate(1.08)brightness(1.03);transform:translateY(-1px);box-shadow:0 14px 30px -14px rgba(79,70,229,.8)}.button:active{transform:translateY(0)}.button[disabled],.button[aria-disabled=true]{opacity:.55;cursor:not-allowed;transform:none;box-shadow:none;filter:none}.button-ghost{background:var(--surface);color:var(--text);border-color:var(--border-strong);box-shadow:var(--shadow-sm)}.button-ghost:hover{color:var(--text);background:var(--surface-3);box-shadow:var(--shadow-sm)}.button-small{padding:.5em .9em;font-size:.875rem}.button-large{padding:.88em 1.4em;font-size:1.02rem}.button-link{border:0;background:0 0;padding:.35em 0;color:var(--muted);font-size:.875rem;font-weight:500;text-decoration:underline;text-underline-offset:.16em}.button-link:hover{color:var(--danger)}.site-header{position:sticky;top:0;z-index:80;background:rgba(245,246,251,.82);border-bottom:1px solid var(--border);backdrop-filter:saturate(1.4)blur(14px);-webkit-backdrop-filter:saturate(1.4)blur(14px)}@media(prefers-color-scheme:dark){.site-header{background:rgba(11,13,20,.82)}}.header-inner{display:flex;align-items:center;gap:28px;min-height:var(--header-h)}.brand{display:inline-flex;align-items:center;gap:10px;color:var(--text);text-decoration:none;font-weight:750;letter-spacing:-.03em;font-size:1.1rem;flex:none}.brand:hover{color:var(--text)}.brand-mark{display:inline-flex;filter:drop-shadow(0 6px 14px rgba(99,102,241,.28))}.brand-mark-small{filter:none}.site-nav{display:flex;align-items:center;gap:22px;margin-left:6px}.site-nav a{color:var(--text-soft);text-decoration:none;font-size:.92rem;font-weight:550;padding:6px 2px;border-bottom:2px solid transparent}.site-nav a:hover{color:var(--text);border-bottom-color:var(--brand)}.header-tools{margin-left:auto;display:flex;align-items:center;gap:12px}.lang-switcher{position:relative}.lang-switcher summary{display:inline-flex;align-items:center;gap:7px;padding:8px 12px;border:1px solid var(--border-strong);border-radius:999px;background:var(--surface);color:var(--text-soft);font-size:.86rem;font-weight:600;cursor:pointer;list-style:none;box-shadow:var(--shadow-sm)}.lang-switcher summary::-webkit-details-marker{display:none}.lang-switcher summary:hover{color:var(--text)}.lang-switcher .icon-chevron{width:.95em;height:.95em;transition:transform .15s ease}.lang-switcher[open] .icon-chevron{transform:rotate(180deg)}.lang-current{max-width:7.5em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.lang-list{position:absolute;right:0;top:calc(100% + 8px);z-index:90;min-width:190px;max-height:min(70vh,460px);overflow:auto;margin:0;padding:7px;list-style:none;background:var(--surface);border:1px solid var(--border-strong);border-radius:14px;box-shadow:var(--shadow-lg)}.lang-list a{display:block;padding:8px 11px;border-radius:9px;color:var(--text-soft);text-decoration:none;font-size:.9rem}.lang-list a:hover{background:var(--surface-3);color:var(--text)}.lang-list a[aria-current=true]{background:var(--brand-soft);color:var(--brand);font-weight:650}.hero{padding:84px 0 0}.hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr)minmax(0,.95fr);align-items:center;gap:56px}.eyebrow{display:inline-flex;align-items:center;gap:7px;margin-bottom:16px;padding:5px 11px;border:1px solid var(--border-strong);border-radius:999px;background:var(--surface);color:var(--text-soft);font-size:.76rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;box-shadow:var(--shadow-sm)}.eyebrow .icon{color:var(--brand);width:1em;height:1em}.hero h1{margin-bottom:20px;max-width:15ch}.grad-text{white-space:nowrap;background:linear-gradient(120deg,var(--brand) 5%,var(--brand-2) 52%,var(--accent) 100%);-webkit-background-clip:text;background-clip:text;color:transparent}.hero-lead{font-size:clamp(1.02rem,1.5vw,1.17rem);color:var(--text-soft);max-width:36rem;margin-bottom:26px}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:24px}.hero-checks{display:flex;flex-wrap:wrap;gap:8px 20px;margin:0;padding:0;list-style:none;color:var(--muted);font-size:.875rem}.hero-checks li{display:inline-flex;align-items:center;gap:6px}.hero-checks .icon{color:var(--success);width:1em;height:1em}.hero-art{position:relative;padding:18px 8px 26px;isolation:isolate}.art-card{position:relative;border-radius:var(--radius-xl);background:var(--surface);border:1px solid var(--border-strong);box-shadow:var(--shadow-lg);overflow:hidden;transform:rotate(1.2deg)}.art-bar{display:flex;align-items:center;gap:7px;padding:13px 16px;border-bottom:1px solid var(--border);background:var(--surface-2)}.art-bar span{width:9px;height:9px;border-radius:50%;background:var(--border-strong)}.art-bar span:first-child{background:#fca5a5}.art-bar span:nth-child(2){background:#fcd34d}.art-bar span:nth-child(3){background:#86efac}.art-bar em{margin-left:auto;font-style:normal;font-family:var(--font-mono);font-size:.7rem;color:var(--muted)}.art-canvas{width:100%;height:auto}.art-chips{display:flex;gap:8px;padding:0 16px 16px;flex-wrap:wrap}.art-chips span{display:inline-flex;align-items:center;gap:5px;padding:5px 10px;border-radius:999px;background:var(--surface-3);border:1px solid var(--border);color:var(--text-soft);font-size:.73rem;font-weight:600}.art-float{position:absolute;display:inline-flex;align-items:center;gap:7px;padding:9px 13px;border-radius:12px;background:var(--surface);border:1px solid var(--border-strong);box-shadow:var(--shadow-md);color:var(--text-soft);font-size:.8rem;font-weight:600;z-index:2}.art-float .icon{color:var(--brand)}.art-float-a{left:-18px;top:34px;transform:rotate(-3deg)}.art-float-b{right:-10px;bottom:8px;transform:rotate(2deg)}.stat-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:52px 0 0;padding:16px;border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--surface);box-shadow:var(--shadow-sm)}.stat{display:flex;flex-direction:column;gap:2px;padding:10px 16px;border-radius:var(--radius-md)}.stat+.stat{border-left:1px solid var(--border)}.stat-value{font-size:1.3rem;font-weight:750;letter-spacing:-.03em;color:var(--text)}.stat-label{font-size:.82rem;color:var(--muted)}.section{padding:86px 0}.section-alt{background:var(--surface-2);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}.section-head{max-width:660px;margin:0 auto 42px;text-align:center}.section-head p{margin:0;color:var(--text-soft);font-size:1.02rem}.tool-section{padding:20px 0 86px}.tool-head{max-width:700px;margin:0 0 30px}.tool-head p{color:var(--text-soft);margin:0;max-width:38rem}.tool-card{display:grid;grid-template-columns:minmax(0,1.12fr)minmax(0,.88fr);border:1px solid var(--border-strong);border-radius:var(--radius-xl);background:var(--surface);box-shadow:var(--shadow-lg);overflow:hidden}.upload-pane{padding:28px;border-right:1px solid var(--border)}.settings-pane{padding:28px;background:var(--surface-2)}.dropzone{width:100%;min-height:316px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;padding:34px 24px;border:2px dashed var(--border-strong);border-radius:var(--radius-lg);background:radial-gradient(420px 220px at 50% 0%,var(--brand-soft),transparent 70%),var(--surface-2);color:var(--text);text-align:center;transition:border-color .15s ease,background .15s ease,transform .15s ease}.dropzone:hover,.dropzone.is-dragging{border-color:var(--brand);background:radial-gradient(420px 220px at 50% 0%,var(--brand-soft),transparent 70%),var(--surface)}.dropzone.is-dragging{transform:scale(1.005)}.dropzone-icon{display:grid;place-items:center;width:58px;height:58px;margin-bottom:10px;border-radius:18px;background:linear-gradient(135deg,var(--btn-1),var(--btn-2));color:#fff;box-shadow:0 16px 30px -16px rgba(99,102,241,.8)}.dropzone-icon .icon{width:26px;height:26px}.dropzone-title{font-size:1.08rem;font-weight:700;letter-spacing:-.01em}.dropzone-hint{color:var(--text-soft);font-size:.93rem}.dropzone-formats{margin-top:4px;color:var(--muted);font-size:.79rem}.dropzone-button{margin-top:16px;padding:.6em 1.1em;border-radius:999px;background:var(--text);color:var(--surface);font-size:.86rem;font-weight:650}.file-card{display:grid;grid-template-columns:150px minmax(0,1fr);gap:18px;align-items:center;padding:16px;border:1px solid var(--border-strong);border-radius:var(--radius-lg);background:var(--surface-2)}.file-thumb{aspect-ratio:1;border-radius:var(--radius-md);overflow:hidden;border:1px solid var(--border);background-color:#fff;background-image:linear-gradient(45deg,#eef0f6 25%,transparent 25%),linear-gradient(-45deg,#eef0f6 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#eef0f6 75%),linear-gradient(-45deg,transparent 75%,#eef0f6 75%);background-size:16px 16px;background-position:0 0,0 8px,8px -8px,-8px 0}.file-thumb img{width:100%;height:100%;object-fit:contain}.file-info{min-width:0}.file-name{margin:0 0 3px;font-weight:700;letter-spacing:-.01em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-meta{display:flex;flex-wrap:wrap;gap:6px;margin:0;color:var(--muted);font-size:.84rem}.file-downscale{margin:7px 0 0;color:var(--warning);font-size:.8rem}.file-actions{display:flex;align-items:center;gap:12px;margin-top:14px}.alert{display:flex;align-items:flex-start;gap:9px;margin-top:14px;padding:12px 14px;border:1px solid var(--border);border-color:color-mix(in srgb,var(--danger) 30%,transparent);border-radius:var(--radius-sm);background:var(--danger-soft);color:var(--danger);font-size:.88rem;line-height:1.45}.alert .icon{margin-top:2px}.settings-pane .advanced{border:1px solid var(--border);border-radius:var(--radius-md);background:var(--surface);overflow:hidden}.advanced summary{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:13px 15px;font-size:.9rem;font-weight:650;cursor:pointer;list-style:none}.advanced summary::-webkit-details-marker{display:none}.advanced summary .icon{color:var(--muted);transition:transform .15s ease}.advanced[open] summary .icon{transform:rotate(180deg)}.advanced-body{display:flex;flex-direction:column;gap:16px;padding:16px;border-top:1px solid var(--border)}.field{display:flex;flex-direction:column;gap:6px}.field>label,.range-head label{font-size:.84rem;font-weight:650;color:var(--text-soft)}.field-hint{margin:0;color:var(--muted);font-size:.76rem;line-height:1.45}select,input[type=range]{width:100%}select{appearance:none;padding:9px 34px 9px 12px;border:1px solid var(--border-strong);border-radius:10px;background-color:var(--surface);background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);background-position:calc(100% - 17px),calc(100% - 12px);background-size:5px 5px,5px 5px;background-repeat:no-repeat;font-size:.88rem}select:hover{border-color:var(--brand)}.range-head{display:flex;align-items:center;justify-content:space-between}output{min-width:2ch;padding:2px 8px;border-radius:999px;background:var(--brand-soft);color:var(--brand);font-size:.78rem;font-weight:700;text-align:center}input[type=range]{accent-color:var(--brand);margin:0}.switch{display:flex;align-items:flex-start;gap:11px;cursor:pointer}.switch 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.icon{width:1.1em;height:1.1em}.button-convert.is-busy .icon{animation:spin 1.1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.free-pill{display:inline-flex;align-items:center;gap:4px;padding:5px 10px;border-radius:999px;background:var(--success-soft);color:var(--success);font-size:.76rem;font-weight:700;white-space:nowrap}.token-status{margin:10px 0 0;color:var(--success);font-size:.8rem;font-weight:600}.limit-note{margin:12px 0 0;color:var(--muted);font-size:.77rem}.privacy-note{display:flex;align-items:flex-start;gap:6px;margin:10px 0 0;color:var(--muted);font-size:.77rem;line-height:1.5}.privacy-note .icon{margin-top:2px;color:var(--success)}.privacy-note a{color:var(--muted);text-decoration:underline}.tool-aside{margin-top:18px;padding:14px 16px;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--surface)}.tool-aside h3{margin:0 0 8px;font-size:.76rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}.tool-aside ul{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:5px}.tool-aside li{display:flex;align-items:flex-start;gap:6px;color:var(--text-soft);font-size:.79rem;line-height:1.4}.tool-aside .icon{margin-top:2px;color:var(--success)}.convert-progress{display:flex;align-items:center;gap:10px;margin-top:14px}.convert-progress-track{flex:1;height:9px;border-radius:999px;background:var(--surface-3);overflow:hidden}.convert-progress-fill{display:block;height:100%;width:0;border-radius:inherit;background:linear-gradient(90deg,var(--brand),var(--brand-2),var(--accent));transition:width .25s ease}.convert-progress-value{min-width:3.2em;text-align:right;color:var(--text-soft);font-size:.8rem;font-variant-numeric:tabular-nums;font-weight:700}.convert-status{min-height:1.4em;margin:12px 0 0;color:var(--brand);font-size:.84rem;font-weight:600}.result{margin-top:26px;scroll-margin-top:calc(var(--header-h) + 20px);padding:28px;border:1px solid var(--border-strong);border-radius:var(--radius-xl);background:var(--surface);box-shadow:var(--shadow-md)}.result-head{display:flex;align-items:flex-start;justify-content:space-between;gap:24px;flex-wrap:wrap;margin-bottom:22px}.result-head h2{margin-bottom:6px}.result-head h2:focus,.result-head h2:focus-visible{outline:none}.result-head p{color:var(--text-soft);margin:0;max-width:40rem}.result-actions{display:flex;gap:10px;flex-wrap:wrap}.compare{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.preview-figure{margin:0}.preview-figure figcaption{margin-bottom:8px;color:var(--muted);font-size:.78rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase}.preview-frame{display:grid;place-items:center;min-height:230px;padding:14px;border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--surface-2);overflow:hidden}.preview-frame 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