:root {
  --header-bg: #1a1a1a;
  --panel: #ffffff;
  --ink: #1f2328;
  --muted: #6b7280;
  --border: #e6e8eb;
  --green: #83b81a;
  --green-dark: #6d9c14;
  --green-ink: #ffffff;
  --accent: #f5f6f7;
  --ok: #83b81a;
  --warn: #b45309;
  --danger: #dc2626;
  --radius: 10px;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.14);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: #eceef0;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 32px 24px;
}

.card {
  width: 100%;
  max-width: 720px;
  background: var(--panel);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

/* Dark header bar: Sirius left, Acer right. Generous padding. */
.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 26px 36px;
  background: var(--header-bg);
}
.card__header img.logo-sirius { height: 48px; width: auto; display: block; }
.card__header img.logo-acer { height: 22px; width: auto; display: block; opacity: 0.92; }
.brand-left { display: flex; align-items: center; gap: 14px; }
.clarity-mark {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  border-left: 1px solid #3a3a3a;
  padding-left: 14px;
}
.clarity-mark .name { color: var(--green); font-weight: 700; font-size: 18px; letter-spacing: .3px; }
.clarity-mark .tag { color: #b9bdc2; font-size: 11px; margin-top: 2px; }

.card__body { padding: 28px; }
h1 { font-size: 20px; margin: 0 0 6px; color: var(--green-dark); }
.lead { color: var(--muted); margin: 0 0 24px; font-size: 14px; line-height: 1.5; }

.field { margin-bottom: 20px; }
.field-label { font-weight: 600; font-size: 14px; }
.req { color: var(--green-dark); font-size: 12px; font-weight: 600; margin-left: 6px; }
.opt { color: var(--muted); font-size: 12px; font-weight: 500; margin-left: 6px; }
.hint { color: var(--muted); font-size: 13px; margin: 4px 0 10px; }
.hint code {
  background: var(--accent);
  padding: 1px 6px;
  border-radius: 5px;
  font-size: 12px;
}

.dropzone {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 84px;
  padding: 14px;
  border: 1.5px dashed var(--border);
  border-radius: 8px;
  background: var(--accent);
  cursor: pointer;
  text-align: center;
  transition: border-color 0.15s, background 0.15s;
}
.dropzone:hover, .dropzone.dragover { border-color: var(--green); background: #f0f5e6; }
.dropzone input[type="file"] { display: none; }
.dz-text { color: var(--muted); font-size: 14px; }
.dropzone.has-file .dz-text { color: var(--ink); font-weight: 600; }

textarea, select.select {
  width: 100%;
  background: var(--accent);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--ink);
  padding: 12px 14px;
  font: inherit;
}
textarea { resize: vertical; }
select.select { cursor: pointer; }
textarea:focus, select.select:focus { outline: none; border-color: var(--green); }

.toolbar { display: flex; gap: 10px; margin-top: 8px; flex-wrap: wrap; }
button, .btn-download {
  font: inherit;
  cursor: pointer;
  border-radius: 8px;
  padding: 10px 16px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--ink);
  font-weight: 550;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: background 0.15s, border-color 0.15s, filter 0.15s;
}
button:hover, .btn-download:hover { background: var(--accent); }
button.primary {
  background: var(--green);
  color: var(--green-ink);
  border-color: var(--green);
}
button.primary:hover { background: var(--green-dark); border-color: var(--green-dark); }
button:disabled { opacity: 0.55; cursor: default; }
.btn-icon { display: block; }

.status {
  border-radius: 8px;
  padding: 14px 16px;
  font-size: 14px;
  border: 1px solid var(--border);
  background: var(--accent);
  margin-top: 8px;
}
.status.working { color: var(--ink); }
.status.error { color: var(--danger); border-color: #fecaca; background: #fee2e2; }
.spinner {
  display: inline-block;
  width: 14px; height: 14px;
  margin-right: 10px;
  border: 2px solid var(--border);
  border-top-color: var(--green);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  vertical-align: -2px;
}
@keyframes spin { to { transform: rotate(360deg); } }

.result { margin-top: 24px; }
.result-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 8px;
}
.result-head h2 { margin: 0; font-size: 18px; color: var(--green-dark); }
.preview {
  width: 100%;
  height: 520px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: white;
}

.card__footer {
  padding: 16px 28px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
  text-align: center;
  font-style: italic;
  background: var(--accent);
}

.hidden { display: none; }