:root {
  --red: #e11d2a;
  --red-dark: #b91722;
  --ink: #1d2027;
  --muted: #6b7280;
  --line: #e6e8eb;
  --bg: #f4f5f7;
  --panel: #ffffff;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 8px 24px rgba(16, 24, 40, .06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
}

/* Header */
.site-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px; background: var(--panel); border-bottom: 1px solid var(--line);
}
.brand { display: flex; flex-direction: column; line-height: 1.1; }
.brand-mark { font-weight: 800; letter-spacing: .08em; color: var(--red); font-size: 20px; }
.brand-sub { font-size: 11px; color: var(--muted); letter-spacing: .04em; }
.site-nav a { color: var(--ink); text-decoration: none; font-size: 14px; font-weight: 600; }
.site-nav a:hover { color: var(--red); }

/* Layout */
.wrap { max-width: 1080px; margin: 0 auto; padding: 28px 24px 48px; }
.page-title { font-size: 26px; margin: 8px 0 4px; }
.page-sub { color: var(--muted); margin: 0 0 24px; }
.layout { display: grid; grid-template-columns: 1fr 1.15fr; gap: 24px; align-items: start; }
@media (max-width: 820px) { .layout { grid-template-columns: 1fr; } }

.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 22px; }

/* Steps */
.step { margin-bottom: 22px; }
.step h2 { font-size: 15px; display: flex; align-items: center; gap: 9px; margin: 0 0 12px; }
.num {
  display: inline-grid; place-items: center; width: 22px; height: 22px;
  background: var(--red); color: #fff; border-radius: 50%; font-size: 12px; font-weight: 700;
}

/* Dropzone */
.dropzone {
  display: block; border: 2px dashed #f0a6ac; border-radius: 12px; background: #fff6f6;
  padding: 26px 16px; text-align: center; cursor: pointer; transition: border-color .15s, background .15s;
}
.dropzone.dragover { border-color: var(--red); background: #ffecee; }
.dropzone.has-file { border-style: solid; border-color: #cfe9d6; background: #f3fbf5; padding: 16px; }
.dz-icon { font-size: 26px; color: var(--red); }
.dropzone p { margin: 8px 0 4px; font-size: 14px; }
.dropzone small { color: var(--muted); }
.dz-filled { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.file-name { font-size: 14px; font-weight: 600; word-break: break-all; }
.file-remove { border: none; background: transparent; color: var(--muted); cursor: pointer; font-size: 16px; }
.file-remove:hover { color: var(--red); }

/* Options */
.options { display: flex; gap: 10px; flex-wrap: wrap; }
.opt { position: relative; flex: 1 1 120px; }
.opt input { position: absolute; opacity: 0; pointer-events: none; }
.opt span {
  display: block; text-align: center; padding: 11px 12px; border: 1.5px solid var(--line);
  border-radius: 10px; font-size: 14px; font-weight: 600; cursor: pointer; transition: all .12s;
}
.opt input:checked + span { border-color: var(--red); background: #fff1f2; color: var(--red); }

/* Buttons */
.btn { display: inline-block; text-align: center; border: none; border-radius: 10px; font-size: 15px; font-weight: 700; cursor: pointer; padding: 13px 18px; text-decoration: none; transition: background .12s, opacity .12s; }
.btn-block { display: block; width: 100%; }
.btn-primary { background: var(--red); color: #fff; }
.btn-primary:hover { background: var(--red-dark); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-ghost { background: #fff; color: var(--red); border: 1.5px solid var(--red); padding: 9px 16px; font-size: 14px; }
.btn-ghost:hover { background: #fff1f2; }
.btn-ghost.copied { background: #f3fbf5; color: #1c7a3e; border-color: #9bd6ab; }

.form-msg { font-size: 13px; min-height: 18px; margin: 10px 0 0; }
.form-msg.error { color: var(--red); }
.form-msg.info { color: var(--muted); }

/* Preview */
.preview-title { font-size: 15px; margin: 0 0 14px; }
.canvas-wrap { position: relative; border-radius: 12px; overflow: hidden; background: #2b2f36; }
#preview-canvas { display: block; width: 100%; height: auto; }
.canvas-placeholder {
  position: absolute; inset: 0; display: grid; place-items: center; text-align: center;
  color: #cbd0d8; padding: 20px; background: linear-gradient(135deg, #2b2f36, #3a3f48);
}
.canvas-placeholder p { margin: 0; font-size: 14px; }

.order-hint { font-size: 13px; color: var(--muted); margin: 14px 0 0; }
.order-result { margin: 16px 0 0; padding: 16px; border: 1px solid var(--line); border-radius: 12px; background: #fafbfc; }
.code-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.code-row small { color: var(--muted); font-size: 12px; }
.order-code { font-size: 24px; font-weight: 800; letter-spacing: .06em; color: var(--ink); }
.code-instruct { font-size: 13px; color: var(--muted); margin: 12px 0 14px; }

.order-btn-spacer { height: 14px; }
#order-btn { margin-top: 14px; }

.site-footer { text-align: center; color: var(--muted); font-size: 13px; padding: 24px; border-top: 1px solid var(--line); }