:root {
    --bg: #0b1120;
    --surface: #111a2d;
    --surface-soft: #162238;
    --text: #e7eefc;
    --muted: #98a7c2;
    --line: #263653;
    --primary: #6d8cff;
    --primary-dark: #5575f2;
    --primary-soft: #1c2a52;
    --success: #43d19a;
    --danger: #ff7b72;
    --shadow: 0 18px 50px rgba(0,0,0,.28);
    --radius: 22px;
}
* { box-sizing: border-box; }
html { min-width: 320px; background: var(--bg); }
body { margin: 0; min-height: 100vh; color: var(--text); background: radial-gradient(circle at 10% 5%, rgba(87,116,255,.16), transparent 28rem), var(--bg); font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif; line-height: 1.5; }
button, input, select { font: inherit; }
button { cursor: pointer; }
.shell { width: min(1220px, calc(100% - 32px)); margin-inline: auto; }
.site-header { color: #fff; background: linear-gradient(135deg, rgba(7,14,35,.99), rgba(25,46,111,.98)), #0d1735; overflow: hidden; }
.header-inner { min-height: 260px; display: flex; align-items: center; justify-content: space-between; gap: 48px; padding-block: 52px; }
.eyebrow { margin: 0 0 8px; color: inherit; opacity: .68; font-size: .76rem; font-weight: 800; letter-spacing: .16em; }
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 14px; font-size: clamp(2rem,5vw,3.55rem); line-height: 1.05; letter-spacing: -.045em; }
.header-copy { max-width: 720px; margin-bottom: 0; color: rgba(231,238,252,.78); font-size: 1.05rem; }
.header-badge { width: 244px; min-width: 244px; aspect-ratio: 1.55; display: grid; place-content: center; gap: 5px; padding: 24px; color: #dbe5ff; background: linear-gradient(135deg,#202e5d,#344a92); border: 1px solid rgba(145,167,255,.35); border-radius: 22px; box-shadow: 0 28px 65px rgba(0,0,0,.25); transform: rotate(5deg); }
.header-badge span { display: block; font-size: 1.7rem; font-weight: 900; letter-spacing: .16em; }
.header-badge span:nth-child(2) { opacity: .52; }
.header-badge span:nth-child(3) { opacity: .22; }
.main-layout { display: grid; grid-template-columns: minmax(330px,430px) minmax(0,1fr); gap: 24px; align-items: start; padding-block: 28px 56px; }
.control-panel, .preview-panel { background: var(--surface); border: 1px solid rgba(54,73,108,.8); border-radius: var(--radius); box-shadow: var(--shadow); }
.control-panel { overflow: hidden; }
.panel-section { padding: 26px; border-bottom: 1px solid var(--line); }
.section-heading { display: flex; gap: 13px; align-items: flex-start; margin-bottom: 20px; }
.section-heading h2, .preview-header h2 { margin-bottom: 3px; font-size: 1.15rem; letter-spacing: -.02em; }
.section-heading p { margin-bottom: 0; color: var(--muted); font-size: .88rem; }
.step { width: 32px; height: 32px; flex: 0 0 32px; display: grid; place-items: center; color: var(--primary); background: var(--primary-soft); border-radius: 10px; font-size: .84rem; font-weight: 900; }
.upload-box { display: flex; align-items: center; gap: 14px; min-height: 82px; padding: 16px; border: 1.5px dashed #405375; border-radius: 16px; background: var(--surface-soft); transition: border-color 160ms ease, background 160ms ease, transform 160ms ease; cursor: pointer; }
.upload-box:hover { border-color: var(--primary); background: #1b2b50; transform: translateY(-1px); }
.upload-box input { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.upload-box strong, .upload-box small { display: block; }
.upload-box small { max-width: 280px; margin-top: 2px; overflow: hidden; color: var(--muted); text-overflow: ellipsis; white-space: nowrap; }
.upload-icon { width: 42px; height: 42px; display: grid; place-items: center; color: var(--primary); background: #1b2946; border: 1px solid #34496f; border-radius: 13px; font-size: 1.25rem; font-weight: 900; }
.field-grid { display: grid; gap: 14px; }
.two-columns { grid-template-columns: repeat(2,minmax(0,1fr)); }
.position-grid { grid-template-columns: minmax(0,1fr) minmax(0,1fr) auto; }
.field { display: block; margin-bottom: 15px; }
.field:last-child { margin-bottom: 0; }
.field > span:first-child { display: block; margin-bottom: 7px; color: #cbd7ed; font-size: .84rem; font-weight: 750; }
.field small, .helper { display: block; margin: 7px 0 0; color: var(--muted); font-size: .78rem; }
input[type=text], input[type=number], select { width: 100%; min-height: 44px; padding: 9px 11px; color: var(--text); background: #0d1729; border: 1px solid #354866; border-radius: 11px; outline: none; transition: border-color 150ms ease, box-shadow 150ms ease; }
input[type=text]::placeholder, input[type=number]::placeholder { color: #71819e; }
input[type=text]:focus, input[type=number]:focus, select:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(109,140,255,.18); }
.color-control { display: flex; align-items: center; gap: 10px; min-height: 44px; padding: 6px 10px; border: 1px solid #354866; border-radius: 11px; background: #0d1729; }
.color-control input[type=color] { width: 46px; height: 30px; padding: 0; border: 0; border-radius: 8px; background: transparent; }
.color-control output { color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .83rem; }
.range-field input[type=range] { width: 100%; accent-color: var(--primary); }
.button { min-height: 44px; padding: 10px 15px; border: 0; border-radius: 12px; font-weight: 800; transition: transform 150ms ease, box-shadow 150ms ease, background 150ms ease; }
.button:hover { transform: translateY(-1px); }
.button-primary { color: #081126; background: var(--primary); box-shadow: 0 10px 22px rgba(77,108,237,.28); }
.button-primary:hover { background: var(--primary-dark); }
.button-secondary { color: #d5def2; background: #202d46; }
.button-secondary:hover { background: #2a3a59; }
.full-width { width: 100%; margin-top: 12px; }
.align-end { align-self: end; margin-bottom: 0; }
.generate-section { padding: 24px 26px 26px; background: linear-gradient(180deg,#15213a,#111b30); }
.summary-line { display: flex; justify-content: space-between; gap: 16px; margin-bottom: 5px; color: var(--muted); font-size: .85rem; }
.summary-line strong { color: var(--text); }
.status { min-height: 20px; margin: 10px 0 0; color: var(--muted); font-size: .82rem; text-align: center; }
.status.error { color: var(--danger); font-weight: 700; }
.status.success { color: var(--success); font-weight: 700; }
.preview-panel { position: sticky; top: 20px; padding: 24px; }
.preview-header, .preview-footer { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.preview-header { margin-bottom: 18px; }
.preview-header .eyebrow { color: var(--primary); opacity: 1; }
.preview-number { padding: 7px 11px; color: #aebeff; background: var(--primary-soft); border-radius: 999px; font-size: .83rem; font-weight: 850; }
.canvas-stage { position: relative; min-height: 390px; display: grid; place-items: center; overflow: hidden; background: linear-gradient(45deg,#1c2940 25%,transparent 25%), linear-gradient(-45deg,#1c2940 25%,transparent 25%), linear-gradient(45deg,transparent 75%,#1c2940 75%), linear-gradient(-45deg,transparent 75%,#1c2940 75%), #101a2d; background-position: 0 0,0 10px,10px -10px,-10px 0; background-size: 20px 20px; border: 1px solid var(--line); border-radius: 17px; }
#previewCanvas { display: none; max-width: 100%; max-height: min(68vh,700px); width: auto; height: auto; touch-action: none; cursor: grab; user-select: none; box-shadow: 0 18px 45px rgba(0,0,0,.42); }
#previewCanvas.dragging { cursor: grabbing; }
.canvas-empty { display: grid; justify-items: center; gap: 5px; color: var(--muted); text-align: center; }
.canvas-empty strong { color: var(--text); }
.empty-icon { width: 62px; height: 62px; display: grid; place-items: center; margin-bottom: 5px; color: #aebeff; background: var(--primary-soft); border-radius: 18px; font-size: 1.8rem; }
.preview-footer { padding: 12px 2px 0; color: var(--muted); font-size: .78rem; }
.notice { margin-top: 18px; padding: 15px 16px; color: #c3d0e8; background: #182744; border-left: 4px solid var(--primary); border-radius: 10px; font-size: .84rem; }
.noscript { max-width: 900px; margin: 20px auto; padding: 16px; color: #ffb8b2; background: #3b1c26; border-radius: 12px; text-align: center; }
@media (max-width:920px) { .header-badge { display: none; } .main-layout { grid-template-columns: 1fr; } .preview-panel { position: static; grid-row: 1; } }
@media (max-width:560px) { .shell { width: min(100% - 20px,1220px); } .header-inner { min-height: auto; padding-block: 38px; } .panel-section, .generate-section, .preview-panel { padding: 20px; } .two-columns, .position-grid { grid-template-columns: 1fr; } .align-end { width: 100%; } .canvas-stage { min-height: 270px; } .preview-footer { align-items: flex-start; flex-direction: column; gap: 3px; } }