/* ZeroFee Tools - SVG to PNG Converter styles (no frameworks) */

:root {
  --bg: #f6f8fc;
  --card: #ffffff;
  --text: #1a2333;
  --muted: #5b6b85;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --border: #e2e8f2;
  --success: #15803d;
  --error: #b91c1c;
  --radius: 12px;
  --shadow: 0 2px 10px rgba(20, 40, 90, 0.07);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

.wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ---------- header ---------- */
.site-header {
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
  color: #fff;
  padding: 36px 0 30px;
  text-align: center;
}
.brand { display: flex; align-items: center; justify-content: center; gap: 10px; }
.brand-icon { font-size: 2rem; }
.brand h1 { margin: 0; font-size: 2.2rem; letter-spacing: 0.5px; }
.tagline { margin: 8px 0 4px; font-size: 1.1rem; opacity: 0.95; }
.privacy-badge {
  display: inline-block;
  margin: 10px 0 0;
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.35);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 0.92rem;
}

/* ---------- tabs ---------- */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 0;
  justify-content: center;
}
.tab-btn {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.tab-btn:hover { border-color: var(--primary); color: var(--primary); }
.tab-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ---------- panels ---------- */
.tool-panel {
  display: none;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px;
  margin: 18px 0 8px;
}
.tool-panel.active { display: block; }
.tool-panel h2 { margin-top: 0; }
.tool-panel h3 { margin: 22px 0 10px; font-size: 1.05rem; }
.how { color: var(--muted); }

/* ---------- dropzone ---------- */
.dropzone {
  border: 2px dashed #b9c6e2;
  border-radius: var(--radius);
  background: #fafcff;
  text-align: center;
  padding: 34px 18px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  margin: 16px 0;
}
.dropzone:hover { border-color: var(--primary); }
.dropzone.drag { border-color: var(--primary); background: #eef4ff; }
.dropzone:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.dz-icon { font-size: 2rem; }
.dz-sub { color: var(--muted); font-size: 0.9rem; margin: 4px 0 0; }

/* ---------- code input ---------- */
.code-input {
  width: 100%;
  padding: 12px 14px;
  font-size: 0.9rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fbfdff;
  resize: vertical;
  margin: 8px 0 4px;
}
.code-input:focus { outline: 2px solid var(--primary); border-color: var(--primary); }

/* ---------- preview ---------- */
.preview-box {
  border: 1px solid var(--border);
  border-radius: 10px;
  background:
    repeating-conic-gradient(#f1f5f9 0% 25%, #ffffff 0% 50%) 50% / 24px 24px;
  padding: 18px;
  text-align: center;
  margin: 10px 0;
}
.preview-box img {
  max-width: 100%;
  max-height: 280px;
  height: auto;
}

/* ---------- buttons & inputs ---------- */
.btn-primary, .btn-secondary, .btn-ghost {
  border: none;
  border-radius: 10px;
  padding: 12px 22px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); }
.btn-primary:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-secondary { background: #eef2f9; color: var(--text); }
.btn-secondary:hover { background: #e0e8f7; }
.btn-ghost { background: transparent; color: var(--muted); border: 1px solid var(--border); }
.btn-ghost:hover { color: var(--text); border-color: #b9c6e2; }
a.btn-secondary { display: inline-block; text-decoration: none; }

.row { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0; align-items: center; }

.text-input {
  width: 100%;
  max-width: 420px;
  padding: 11px 14px;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
}
.text-input:focus { outline: 2px solid var(--primary); border-color: var(--primary); }
.num-input { max-width: 140px; }
.field-label { display: block; margin: 14px 0 6px; font-weight: 600; }

input[type="color"] {
  width: 44px;
  height: 32px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: 8px;
  vertical-align: middle;
  cursor: pointer;
}

.quality-pick {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  margin: 14px 0;
  display: grid;
  gap: 8px;
}
.quality-pick legend { font-weight: 700; padding: 0 8px; }
.quality-pick label { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

.fileinfo { color: var(--muted); font-size: 0.95rem; }
.hint { color: var(--muted); font-size: 0.92rem; }
.result-line { margin: 10px 0; font-size: 1.02rem; }

/* ---------- status ---------- */
.status { margin: 12px 0 0; font-size: 0.95rem; min-height: 1.2em; }
.status.show.info { color: var(--muted); }
.status.show.success { color: var(--success); font-weight: 600; }
.status.show.error { color: var(--error); font-weight: 600; }

/* ---------- faq ---------- */
.faq {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px;
  margin: 26px 0;
}
.faq h2 { margin-top: 0; }
.faq h3 { margin: 18px 0 4px; font-size: 1.02rem; }
.faq p { margin: 4px 0 0; color: var(--muted); }

.hidden { display: none !important; }

/* ---------- responsive ---------- */
@media (max-width: 600px) {
  .tool-panel, .faq { padding: 18px 14px; }
  .brand h1 { font-size: 1.7rem; }
  .tab-btn { padding: 9px 14px; font-size: 0.88rem; }
}