:root{--bg:#f5f7fa;--panel:#ffffffe6;--panel-strong:#fff;--border:#0f172a14;--border-strong:#0f172a24;--text:#0f172a;--text-soft:#475569;--text-faint:#64748b;--accent:#111827;--accent-soft:#f1f5f9;--success-bg:#ecfdf3;--success-border:#a7f3d0;--success-text:#065f46;--error-bg:#fef2f2;--error-border:#fecaca;--error-text:#991b1b;--working-bg:#eff6ff;--working-border:#bfdbfe;--working-text:#1d4ed8;--idle-bg:#f8fafc;--idle-border:#e2e8f0;--idle-text:#334155;--shadow:0 24px 60px #0f172a0f;--radius-lg:24px;--radius-md:16px;--sans:system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;--mono:"SFMono-Regular", "JetBrains Mono", Consolas, monospace}*{box-sizing:border-box}html,body{min-height:100%;color:var(--text);font-family:var(--sans);background:linear-gradient(#fafbfc 0%,#f5f7fa 100%);margin:0}body{min-height:100vh}button,input{font:inherit}.app-shell{width:min(1120px,100% - 32px);margin:0 auto;padding:32px 0 40px}.topbar{justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:20px;display:flex}.brand-block{gap:8px;display:grid}.brand-title{letter-spacing:-.04em;margin:0;font-size:clamp(1.75rem,2.5vw,2.4rem);font-weight:800;line-height:1}.brand-subtitle{max-width:640px;color:var(--text-soft);margin:0;font-size:.98rem;line-height:1.7}.locale-switch{border:1px solid var(--border);background:#ffffffc7;border-radius:999px;align-items:center;gap:6px;padding:4px;display:inline-flex;box-shadow:0 8px 24px #0f172a0a}.locale-button{min-width:78px;height:38px;color:var(--text-soft);cursor:pointer;background:0 0;border:0;border-radius:999px;padding:0 14px;font-weight:600;transition:background .16s,color .16s}.locale-button.is-active{background:var(--accent);color:#fff}.content-grid{grid-template-columns:minmax(360px,.95fr) minmax(0,1.05fr);align-items:stretch;gap:16px;display:grid}.panel{border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--panel);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);box-shadow:var(--shadow);padding:24px}.log-panel,.downloads-panel{grid-column:1/-1}.panel-head{justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px;display:flex}.panel-head.compact{margin-bottom:14px}.panel-title,.section-title{letter-spacing:-.02em;margin:0;font-size:1rem;font-weight:700}.section-note,.downloads-note{color:var(--text-soft);margin:0;font-size:.94rem;line-height:1.7}.converter-form{gap:16px;display:grid}.field-block{gap:10px;display:grid}.field-label,.status-label,.range-field span{color:var(--text-faint);letter-spacing:.08em;text-transform:uppercase;font-size:.76rem;font-weight:700;display:block}.input-row{grid-template-columns:1fr auto;gap:12px;display:grid}input[type=text],input[type=number]{border:1px solid var(--border);border-radius:var(--radius-md);background:var(--panel-strong);width:100%;min-height:52px;color:var(--text);outline:none;padding:0 16px;transition:border-color .16s,box-shadow .16s}input[type=text]:focus,input[type=number]:focus{border-color:#0f172a38;box-shadow:0 0 0 4px #0f172a0a}.primary-button,.secondary-button,.download-link{border-radius:var(--radius-md);cursor:pointer;border:0;min-height:52px;padding:0 18px;font-weight:600;transition:background .16s,opacity .16s,transform .16s}.primary-button{background:var(--accent);color:#fff}.secondary-button,.download-link{background:var(--accent-soft);min-height:40px;color:var(--text)}.primary-button:hover,.secondary-button:hover,.download-link:hover{transform:translateY(-1px)}.primary-button:disabled,.secondary-button:disabled,.download-link:disabled,.locale-button:disabled,input:disabled{opacity:.56;cursor:not-allowed;transform:none}.toggle-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.toggle-card,.range-card,.status-item,.download-item{border:1px solid var(--border);border-radius:var(--radius-md);background:#ffffffd1}.toggle-card{grid-template-columns:auto 1fr;align-items:start;gap:12px;padding:16px;display:grid}.toggle-card input,.inline-option input{width:16px;height:16px;accent-color:var(--accent);margin-top:2px}.toggle-card span{gap:4px;display:grid}.toggle-card strong{font-size:.96rem;font-weight:600}.toggle-card small,.inline-option{color:var(--text-soft);line-height:1.6}.range-card{padding:16px}.range-grid{grid-template-columns:1fr 1fr;gap:12px;display:grid}.range-field{gap:8px;display:grid}.status-banner{border-radius:var(--radius-md);border:1px solid;margin-bottom:12px;padding:16px 18px;transition:background .18s,border-color .18s,color .18s}.status-banner-title{margin:0;font-size:1rem;font-weight:700}.status-banner-detail{color:inherit;opacity:.9;margin:6px 0 0;line-height:1.6}.status-banner-idle{background:var(--idle-bg);border-color:var(--idle-border);color:var(--idle-text)}.status-banner-working{background:var(--working-bg);border-color:var(--working-border);color:var(--working-text)}.status-banner-done{background:var(--success-bg);border-color:var(--success-border);color:var(--success-text)}.status-banner-error{background:var(--error-bg);border-color:var(--error-border);color:var(--error-text)}.task-progress{gap:8px;margin-bottom:14px;display:grid}.task-progress-track{background:#e7edf5;border-radius:999px;height:10px;position:relative;overflow:hidden}.task-progress-bar{border-radius:inherit;background:linear-gradient(90deg,#0f172a 0%,#334155 100%);width:0%;height:100%;transition:width .18s}.task-progress-bar-working{background:linear-gradient(90deg,#2563eb 0%,#60a5fa 100%)}.task-progress-bar-done{background:linear-gradient(90deg,#059669 0%,#34d399 100%)}.task-progress-bar-error{background:linear-gradient(90deg,#dc2626 0%,#f87171 100%)}.task-progress-track.is-indeterminate .task-progress-bar{width:38%;animation:1.1s ease-in-out infinite task-progress-slide}.task-progress-meta{color:var(--text-soft);margin:0;font-size:.9rem}@keyframes task-progress-slide{0%{transform:translate(-110%)}to{transform:translate(290%)}}.status-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.status-item{padding:14px 16px}.status-item-wide{grid-column:1/-1}.status-value{color:var(--text);word-break:break-word;margin:8px 0 0;line-height:1.65}.status-value.mono,.mono{font-family:var(--mono);font-size:.84rem}.busy-pill{height:34px;color:var(--text-soft);background:#eef2f7;border-radius:999px;align-items:center;gap:8px;padding:0 12px;font-size:.88rem;font-weight:600;display:inline-flex}.busy-pill:before{content:"";background:#0f172a;border-radius:50%;width:8px;height:8px}.hidden{display:none}.log-output{border:1px solid var(--border);border-radius:var(--radius-md);color:#dbe4f0;min-height:220px;max-height:380px;font:.83rem/1.7 var(--mono);white-space:pre-wrap;background:#0f172a;margin:0;padding:16px;overflow:auto}.downloads-options{gap:10px;margin-top:16px;display:grid}.inline-option{align-items:center;gap:10px;display:inline-flex}.downloads-list{gap:12px;margin-top:18px;display:grid}.toast-stack{z-index:40;pointer-events:none;gap:10px;width:min(360px,100vw - 24px);display:grid;position:fixed;bottom:20px;right:20px}.toast{border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text);pointer-events:auto;background:#fffffff5;padding:14px 16px;line-height:1.6;box-shadow:0 18px 40px 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24px}.topbar,.panel-head,.download-item,.input-row,.toggle-grid,.range-grid{flex-direction:column;grid-template-columns:1fr;align-items:stretch}.topbar{display:grid}.locale-switch{width:fit-content}.panel{padding:18px}.input-row,.toggle-grid,.range-grid,.status-list{grid-template-columns:1fr}.download-item{display:grid}.toast-stack{width:auto;bottom:12px;left:12px;right:12px}.status-item-wide{grid-column:auto}}