:root {
  --bg: #f7f4ec;
  --surface: #fffdf8;
  --soft: #eef2e6;
  --ink: #1f3328;
  --muted: #56655a;
  --line: #ddd8c9;
  --green: #23583c;
  --green-dark: #173f2a;
  --clay: #b5653b;
  --focus: #c47a2c;
  --danger: #9a302d;
  --radius: 14px;
  --font: Vazirmatn, "Vazir", Tahoma, "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}
body [hidden] { display: none !important; }
a { color: inherit; }
h1, h2, h3 { line-height: 1.5; margin: 0 0 12px; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 6px; }

.skip {
  position: absolute; inset-inline-start: 16px; top: -60px;
  background: var(--green); color: #fff; padding: 8px 16px; border-radius: 8px; z-index: 10;
}
.skip:focus { top: 12px; }

.site-header, main, .site-footer { max-width: 1120px; margin: 0 auto; padding-inline: 32px; }

.site-header {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding-block: 20px; border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-size: 24px; font-weight: 700; color: var(--green); }
.brand small { display: block; font-size: 12px; font-weight: 400; color: var(--muted); line-height: 1.2; }
.brand-mark { width: 34px; height: 34px; }
nav { display: flex; gap: 24px; font-size: 15px; }
nav a { text-decoration: none; padding: 4px 2px; }
nav a:hover { color: var(--green); text-decoration: underline; text-underline-offset: 6px; }

.hero {
  display: flex; align-items: flex-end; justify-content: space-between; gap: 32px;
  padding-block: 40px 28px;
}
.eyebrow { color: var(--clay); font-size: 14px; font-weight: 700; margin: 0 0 4px; }
h1 { font-size: clamp(32px, 4.4vw, 52px); letter-spacing: -.5px; }
.intro { color: var(--muted); max-width: 560px; margin: 0; font-size: 17px; }
.mini-steps { list-style: none; display: flex; gap: 8px; margin: 0; padding: 0; flex-shrink: 0; }
.mini-steps li {
  display: flex; align-items: center; gap: 8px; font-size: 14px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 999px; padding: 6px 14px 6px 8px;
}
.mini-steps b {
  display: grid; place-items: center; width: 26px; height: 26px; border-radius: 50%;
  background: var(--soft); color: var(--green); font-size: 13px;
}

.workspace {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px; scroll-margin-top: 16px; box-shadow: 0 1px 0 rgba(31, 51, 40, .04), 0 12px 32px -20px rgba(31, 51, 40, .25);
}
.form-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; }
.form-head h2 { font-size: 26px; margin: 0; }
.status {
  margin: 0; font-size: 14px; padding: 6px 14px; border-radius: 999px;
  background: var(--soft); display: inline-flex; align-items: center; gap: 8px;
}
.status::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: #9aa59c; }
.status[data-state="ok"]::before { background: #2f8a4f; }
.status[data-state="off"] { background: #f8e9e2; color: #7a2e1c; }
.status[data-state="off"]::before { background: var(--danger); }

form { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: 32px; margin-top: 24px; }

.upload {
  position: relative; display: flex; align-items: center; justify-content: center;
  min-height: 300px; border: 2px dashed #b8b39f; border-radius: 12px;
  background: var(--bg); cursor: pointer; text-align: center; overflow: hidden;
  transition: border-color .15s, background-color .15s;
}
.upload:hover, .upload.dragging { border-color: var(--green); background: var(--soft); }
.upload-col:has(.file-input:focus-visible) .upload { outline: 3px solid var(--focus); outline-offset: 3px; }
.upload-label { display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 24px; }
.upload-label svg { width: 44px; height: 44px; color: var(--green); }
.upload-label small { color: var(--muted); font-size: 13px; }
.upload img { width: 100%; height: 100%; max-height: 360px; object-fit: contain; }
.file-input {
  position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
}
.file-row { display: flex; justify-content: space-between; gap: 8px; font-size: 14px; margin: 10px 0 0; overflow-wrap: anywhere; }
.link-btn { background: none; border: 0; padding: 0; font: inherit; color: var(--danger); text-decoration: underline; cursor: pointer; flex-shrink: 0; }
.note { color: var(--muted); font-size: 13px; margin: 6px 0 0; }

label { display: block; font-size: 15px; font-weight: 700; margin-bottom: 6px; }
.opt, .req { font-weight: 400; color: var(--muted); font-size: 13px; }
input:not([type=file]), select, textarea {
  display: block; width: 100%; margin: 0 0 18px; padding: 11px 13px;
  border: 1px solid #c3bfae; border-radius: 10px; background: #fff; color: var(--ink); font: inherit;
}
textarea { resize: vertical; margin-bottom: 0; }
input:focus-visible, select:focus-visible, textarea:focus-visible { border-color: var(--green); }
[aria-invalid="true"] { border-color: var(--danger) !important; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.button {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  margin-top: 20px; min-height: 50px; padding: 12px 26px; width: 100%;
  background: var(--green); color: #fff; border: 0; border-radius: 10px;
  font: inherit; font-weight: 700; cursor: pointer;
}
.button:hover { background: var(--green-dark); }
.button[aria-busy="true"] { opacity: .75; cursor: progress; }
.spinner { display: none; width: 18px; height: 18px; border: 2px solid rgba(255,255,255,.4); border-top-color: #fff; border-radius: 50%; animation: spin .8s linear infinite; }
.button[aria-busy="true"] .spinner { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }
.error { color: var(--danger); font-size: 14px; margin: 10px 0 0; min-height: 1em; }

.result {
  margin-top: 28px; padding: 24px; background: var(--soft); border-radius: 12px;
  border-inline-start: 4px solid var(--green);
}
.result:focus { outline: none; }
.result:focus-visible { outline: 3px solid var(--focus); }
.answer { white-space: pre-wrap; overflow-wrap: anywhere; }
.disclaimer { font-size: 13px; color: var(--muted); border-top: 1px solid var(--line); padding-top: 12px; margin: 16px 0 0; }

.how, .tips { padding-block: 48px 8px; }
.how h2, .tips h2 { font-size: 24px; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.steps article { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
.steps b { display: block; font-size: 17px; }
.steps p { color: var(--muted); margin: 6px 0 0; }
.tips ul { margin: 0; padding-inline-start: 22px; color: var(--muted); }

.site-footer {
  display: flex; justify-content: space-between; gap: 12px; margin-top: 48px;
  padding-block: 24px; border-top: 1px solid var(--line); font-size: 14px; color: var(--muted);
}
.site-footer b { color: var(--green); }

@media (max-width: 820px) {
  .hero { flex-direction: column; align-items: flex-start; }
  form { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .site-header, main, .site-footer { padding-inline: 16px; }
  .site-header { flex-wrap: wrap; }
  nav { gap: 14px; font-size: 14px; }
  .workspace { padding: 20px 16px; }
  .pair { grid-template-columns: 1fr; gap: 0; }
  .upload { min-height: 220px; }
  .mini-steps { flex-wrap: wrap; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition: none !important; }
}
.feedback { margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--line); }
.feedback > p { margin: 0 0 10px; }
.feedback-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.feedback-actions button { border: 1px solid var(--line); background: var(--surface); color: var(--green); border-radius: 7px; padding: 8px 12px; font: inherit; cursor: pointer; }
.feedback-actions button:hover:not(:disabled) { background: var(--soft); }
.feedback-actions button:disabled { opacity: .6; cursor: wait; }
#feedback-status { color: var(--muted); }