.app{max-width:1440px;margin:0 auto;padding:32px 24px 64px}.app-header h1{margin:0 0 6px;font-size:26px;letter-spacing:.5px}.subtitle{margin:0 0 24px;color:var(--text-dim);font-size:14px;line-height:1.6}.layout{display:grid;grid-template-columns:minmax(480px,640px) 1fr;gap:24px;align-items:start}@media(max-width:1080px){.layout{grid-template-columns:1fr}}.panel,.preview{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px}.dropzone{border:1.5px dashed var(--border);border-radius:var(--radius);padding:26px 16px;text-align:center;cursor:pointer;transition:border-color .15s,background .15s;background:var(--surface-2)}.dropzone:hover,.dropzone.drag-over{border-color:var(--accent);background:#20283a}.dropzone-inner{display:flex;flex-direction:column;gap:6px}.dropzone-inner strong{font-size:16px}.dropzone-inner span{color:var(--text-dim);font-size:13px}.dropzone-inner small{color:var(--accent);font-size:12px}.alert{margin-top:12px;padding:8px 12px;border-radius:8px;background:#ff6b6b1f;color:var(--danger);font-size:13px}.thumbs{list-style:none;margin:16px 0 0;padding:0;display:flex;gap:12px;flex-wrap:wrap}.thumb{background:var(--surface-2);border:1px solid var(--border);border-radius:10px;padding:8px;display:flex;flex-direction:column;gap:8px;align-items:center}.thumb-canvas{border-radius:6px;display:block;max-height:88px}.thumb-actions{display:flex;gap:4px}.thumb-actions button{padding:2px 8px;font-size:12px;border-radius:6px}.thumb-actions .danger:hover:not(:disabled){border-color:var(--danger);color:var(--danger)}.controls-grid{margin-top:20px;display:grid;grid-template-columns:1fr 1fr;gap:0 20px}@media(max-width:600px){.controls-grid{grid-template-columns:1fr}}.controls-col{display:flex;flex-direction:column;gap:16px}.field{display:flex;flex-direction:column;gap:8px;font-size:13px;color:var(--text-dim)}.field>span em{color:var(--text);font-style:normal;font-weight:600}.field>span .hint{margin-left:8px;color:var(--text-dim);font-size:12px}.field input[type=range]{width:100%;accent-color:var(--accent)}.group-title{margin-top:6px;padding-top:14px;padding-bottom:2px;border-top:1px solid var(--border);font-size:12px;font-weight:600;letter-spacing:1px;color:var(--text-dim)}.group-title.first{margin-top:0;border-top:none;padding-top:0}.check-field{flex-direction:row;align-items:center;gap:10px;color:var(--text);cursor:pointer}.check-field input[type=checkbox]{width:16px;height:16px;accent-color:var(--accent)}.color-row{flex-direction:row;align-items:center;justify-content:space-between}.color-row input[type=color]{width:44px;height:30px;padding:0;border:1px solid var(--border);border-radius:6px;background:var(--surface-2);cursor:pointer}.color-pair{display:flex;gap:8px}.ratio-group{display:flex;gap:8px;flex-wrap:wrap}.ratio-group button{flex:1;min-width:64px;padding:6px 8px;font-size:13px}.ratio-group button.active{border-color:var(--accent);background:#5b8cff2e;color:var(--text)}.actions{margin-top:22px;display:flex;gap:10px;flex-wrap:wrap}.actions button{flex:1;min-width:96px}.actions .primary{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}.actions .primary:hover:not(:disabled){background:var(--accent-hover)}.actions .ghost{background:transparent;flex:0 0 auto}.status{margin-top:12px;font-size:13px;color:var(--accent)}.preview-head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:12px;font-size:14px}.preview-head .dim{color:var(--text-dim);font-size:12px}.preview-stage{min-height:360px;border-radius:var(--radius);display:flex;align-items:center;justify-content:center;padding:16px;overflow:auto;background-color:#11141a;background-image:linear-gradient(45deg,#1c2230 25%,transparent 25%),linear-gradient(-45deg,#1c2230 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#1c2230 75%),linear-gradient(-45deg,transparent 75%,#1c2230 75%);background-size:24px 24px;background-position:0 0,0 12px,12px -12px,-12px 0}.preview-canvas{max-width:100%;max-height:70vh;height:auto;display:block;box-shadow:0 8px 30px #00000059}.empty{color:var(--text-dim);font-size:14px}:root{--bg: #0f1115;--surface: #181b22;--surface-2: #1f2430;--border: #2a3140;--text: #e7eaf0;--text-dim: #9aa3b2;--accent: #5b8cff;--accent-hover: #6f9aff;--danger: #ff6b6b;--radius: 12px;color-scheme:dark;font-family:system-ui,-apple-system,Segoe UI,PingFang SC,Microsoft YaHei,Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:radial-gradient(1200px 600px at 70% -10%,#1a2030,var(--bg));color:var(--text)}button{font:inherit;cursor:pointer;border:1px solid var(--border);background:var(--surface-2);color:var(--text);border-radius:8px;padding:8px 14px;transition:background .15s,border-color .15s,opacity .15s}button:hover:not(:disabled){border-color:var(--accent)}button:disabled{opacity:.45;cursor:not-allowed}