/* Form 8843 generator — tax.liuzi.us */
:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --ink: #1c2430;
  --muted: #5c6a7d;
  --line: #dde3ec;
  --accent: #1a56db;
  --accent-dark: #1544a8;
  --ok: #0e7c4a;
  --warn-bg: #fff7e0;
  --warn-line: #e2b93b;
  --stop-bg: #fdeaea;
  --stop-line: #d05252;
  --info-bg: #e9f1ff;
  --info-line: #9dbdf5;
  --radius: 10px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
}

header.site {
  background: linear-gradient(135deg, #12316e, #1a56db);
  color: #fff;
  padding: 26px 16px 20px;
  text-align: center;
}
header.site h1 { margin: 0 0 4px; font-size: 1.7rem; letter-spacing: .3px; }
header.site .form-badge {
  display: inline-block; background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.35); border-radius: 999px;
  padding: 1px 10px; font-size: .8rem; margin-left: 8px; vertical-align: middle;
}
#tagline { margin: 2px 0 10px; opacity: .92; font-size: .98rem; }
#privacy-badge {
  display: inline-block; background: rgba(0,0,0,.22); border-radius: 999px;
  padding: 4px 14px; font-size: .85rem;
}
#lang-toggle {
  position: absolute; top: 14px; right: 14px;
  background: rgba(255,255,255,.14); color: #fff;
  border: 1px solid rgba(255,255,255,.5); border-radius: 999px;
  padding: 4px 14px; font-size: .9rem; cursor: pointer;
}
#lang-toggle:hover { background: rgba(255,255,255,.28); }
header.site { position: relative; }
@media (max-width: 560px) {
  header.site h1 { font-size: 1.35rem; padding: 0 76px; }
}

.sr-only {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

main { max-width: 780px; margin: 0 auto; padding: 20px 14px 40px; }

/* step indicator */
ol.steps {
  display: flex; list-style: none; margin: 4px 0 18px; padding: 0;
  justify-content: space-between; gap: 4px;
}
ol.steps li { flex: 1; text-align: center; font-size: .78rem; color: var(--muted); }
ol.steps .dot {
  display: block; width: 28px; height: 28px; line-height: 28px; margin: 0 auto 4px;
  border-radius: 50%; background: #64748b; color: #fff; font-weight: 700;
}
ol.steps li.current .dot { background: var(--accent); }
ol.steps li.current { color: var(--accent); font-weight: 600; }
ol.steps li.done .dot { background: var(--ok); }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 26px 20px; box-shadow: 0 1px 3px rgba(16, 30, 55, .06);
}
.card h2 { margin: 0 0 12px; font-size: 1.3rem; }
.card h3 { margin: 26px 0 8px; font-size: 1.05rem; }

.hint { color: var(--muted); font-size: .88rem; margin: 4px 0 10px; }
.req { color: var(--stop-line); }

.field { margin: 14px 0; }
.field label, .field legend { display: block; font-weight: 600; font-size: .95rem; margin-bottom: 5px; }
.field input[type="text"], .field input[type="date"], .field select {
  width: 100%; padding: 9px 11px; font-size: 1rem; color: var(--ink);
  border: 1px solid var(--line); border-radius: 7px; background: #fff;
}
.field input:focus, .field select:focus {
  outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent);
}
.field.has-error input, .field.has-error select { border-color: var(--stop-line); }
.field-error { color: #b02a2a; font-size: .86rem; margin: 5px 0 0; }
label.check.has-error, fieldset.has-error { border-radius: 6px; }

.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
@media (max-width: 560px) { .grid2 { grid-template-columns: 1fr; } }

fieldset.field { border: none; padding: 0; margin: 16px 0; }
label.radio { display: block; padding: 7px 4px; font-size: .97rem; cursor: pointer; }
label.check { display: block; margin: 14px 0; font-size: .95rem; cursor: pointer; }
label.check input, label.radio input { margin-right: 8px; }
.indent { margin-left: 26px; }

.yn-buttons { display: flex; gap: 10px; }
.yn-btn {
  min-width: 90px; padding: 8px 18px; font-size: 1rem; cursor: pointer;
  border: 1.5px solid var(--line); border-radius: 8px; background: #fff; color: var(--ink);
}
.yn-btn.on { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 700; }

.notice {
  border-radius: 8px; padding: 12px 16px; margin: 16px 0; font-size: .93rem;
  border: 1px solid; border-left-width: 5px;
}
.notice p { margin: 4px 0; }
.notice-title { font-weight: 700; }
.notice.info { background: var(--info-bg); border-color: var(--info-line); }
.notice.warn { background: var(--warn-bg); border-color: var(--warn-line); }
.notice.stop { background: var(--stop-bg); border-color: var(--stop-line); }
.notice.slim { margin: 0 0 14px; }

.exempt-count { font-weight: 600; color: var(--accent-dark); }

.days-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
@media (max-width: 560px) { .days-grid { grid-template-columns: 1fr; } }
.day-field input { text-align: center; font-size: 1.15rem; }
.day-quick { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
button.mini {
  font-size: .78rem; padding: 3px 9px; cursor: pointer;
  border: 1px solid var(--line); border-radius: 999px; background: #f2f5fa; color: var(--muted);
}
button.mini:hover { border-color: var(--accent); color: var(--accent); }

.visa-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; }
@media (max-width: 560px) { .visa-grid { grid-template-columns: repeat(3, 1fr); } }
.visa-cell label { font-size: .82rem; font-weight: 600; text-align: center; display: block; }
.visa-cell select { width: 100%; padding: 6px 4px; border: 1px solid var(--line); border-radius: 6px; }

.year-checks { display: flex; flex-wrap: wrap; gap: 4px 14px; }
.ycheck { font-size: .92rem; }

.nav-row { display: flex; justify-content: space-between; margin-top: 28px; }
button.primary, a.primary {
  background: var(--accent); color: #fff; border: none; border-radius: 8px;
  padding: 10px 22px; font-size: 1rem; font-weight: 600; cursor: pointer; text-decoration: none;
  display: inline-block;
}
button.primary:hover, a.primary:hover { background: var(--accent-dark); }
button.primary:disabled { background: #a9b6ca; cursor: not-allowed; }
button.secondary {
  background: #fff; color: var(--ink); border: 1.5px solid var(--line);
  border-radius: 8px; padding: 10px 20px; font-size: 1rem; cursor: pointer;
}
button.primary.big, a.primary.big { padding: 13px 30px; font-size: 1.08rem; }
.generate-row { text-align: center; margin: 26px 0 8px; }

table.review { width: 100%; border-collapse: collapse; font-size: .92rem; margin: 4px 0 8px; }
table.review th, table.review td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.review th { width: 44%; color: var(--muted); font-weight: 600; }
.blank { color: #6b7789; font-style: italic; }
.review-head { display: flex; align-items: baseline; gap: 10px; }
.edit-link {
  background: none; border: 1px solid var(--line); border-radius: 999px;
  color: var(--accent-dark); font-size: .8rem; padding: 2px 12px; cursor: pointer;
}
.edit-link:hover, .edit-link:focus { border-color: var(--accent); text-decoration: underline; }

.pdf-result { text-align: center; margin-top: 10px; }
.pdf-result .download { margin: 6px 0 4px; }
.pdf-preview {
  width: 100%; height: 560px; border: 1px solid var(--line); border-radius: 8px; margin-top: 8px;
  background: #eef1f6;
}

.next-steps { margin-top: 26px; text-align: left; }
.next-steps ol { padding-left: 22px; }
.next-steps li { margin: 8px 0; }
.next-steps li.attach-warn { background: var(--warn-bg); border-left: 4px solid var(--warn-line); padding: 8px 12px; }
.mail-address {
  background: #f5f8ff; border: 1px dashed var(--info-line); border-radius: 8px;
  padding: 12px 18px; margin-top: 12px; display: inline-block;
}
.mail-address .address { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: .95rem; }

footer.site {
  max-width: 780px; margin: 0 auto; padding: 8px 16px 46px; color: var(--muted); font-size: .82rem;
  text-align: center;
}
footer.site a { color: var(--accent-dark); }
#btn-clear {
  margin-top: 12px; background: none; border: 1px solid var(--line); border-radius: 999px;
  color: var(--muted); padding: 5px 16px; font-size: .82rem; cursor: pointer;
}
#btn-clear:hover { border-color: var(--stop-line); color: var(--stop-line); }