/* halfFull landing — show the exact moment the product matters: a Japanese
   form rejecting half-width katakana. Everything else is supporting cast. */

:root {
  --ink:       #0E1320;
  --ink-soft:  #5B6377;
  --ink-faint: #9098A8;
  --paper:     #FAFAFB;
  --card:      #FFFFFF;
  --line:      #E8E9EE;

  --amber:     #E47118;
  --amber-2:   #FFA951;
  --error:     #D03030;
  --error-bg:  #FFF1F0;
  --ok:        #1F8E4D;
  --ok-bg:     #EAF7EF;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink:       #ECEEF6;
    --ink-soft:  #A4ABC0;
    --ink-faint: #7B8398;
    --paper:     #0E1320;
    --card:      #1A2034;
    --line:      #2A3151;
    --error-bg:  rgba(208, 48, 48, 0.12);
    --ok-bg:     rgba(31, 142, 77, 0.12);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue",
               "PingFang SC", "Hiragino Sans GB", "Hiragino Kaku Gothic ProN", sans-serif;
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* Background: two soft radial colour washes (warm top-left, cool bottom-right)
   on top of the paper base, giving a faint mesh-gradient depth without competing
   with the content. The blobs are fixed so they don't scroll out of view. */
body {
  background:
    radial-gradient(60% 50% at 12% 8%,   rgba(255, 178, 124, 0.16), transparent 70%),
    radial-gradient(55% 45% at 88% 92%,  rgba(146, 168, 232, 0.14), transparent 70%),
    var(--paper);
  background-attachment: fixed;
}
@media (prefers-color-scheme: dark) {
  body {
    background:
      radial-gradient(60% 50% at 12% 8%,   rgba(255, 178, 124, 0.10), transparent 70%),
      radial-gradient(55% 45% at 88% 92%,  rgba(120, 145, 220, 0.12), transparent 70%),
      var(--paper);
    background-attachment: fixed;
  }
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 96px 24px 64px;
  text-align: center;
}

.icon {
  width: 128px; height: 128px;
  border-radius: 28px;
  box-shadow: 0 12px 32px -16px rgba(14, 19, 32, 0.25);
  margin: 0 auto 24px;
  display: block;
}

h1 {
  font-size: 52px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
  line-height: 1;
}

/* Three taglines stacked — EN / ZH / JA. The EN one is full-width as a
   little visual proof of what the product produces. */

.tagline {
  font-size: 17px;
  color: var(--ink-soft);
  margin: 0 0 6px;
  line-height: 1.5;
}
.tagline:last-of-type { margin-bottom: 40px; }
.tagline.lang-en { color: var(--ink); font-weight: 500; }
.kbd-line { margin-right: 4px; }
/* Halfwidth/fullwidth visual contrast in the EN tagline — the line itself
   visually demonstrates what the product does to your text.
   Half-width = "the problem" (de-emphasized); full-width = "the result" (emphasized). */
.tagline .hw { color: var(--ink-faint); }
.tagline .fw { color: var(--ink); margin-left: 4px; }

kbd {
  display: inline-block;
  font: 600 0.88em/1 -apple-system, "SF Mono", Menlo, monospace;
  padding: 2px 7px;
  margin: 0 1px;
  background: var(--card);
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  color: var(--ink);
  vertical-align: 1px;
}

/* Form demo cards. Mimicking a real Japanese form (label above, required tag,
   border state on the field, validation message under). */

.forms {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 0 0 40px;
  text-align: left;
}
@media (max-width: 560px) {
  .forms { grid-template-columns: 1fr; }
}

.form {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
}

.row label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 10px;
  letter-spacing: 0.01em;
}
.row .req {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 6px;
  font-size: 10px;
  font-weight: 600;
  color: white;
  background: var(--ink-faint);
  border-radius: 3px;
  vertical-align: 1px;
}

.field {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0;
  transition: border-color 0.15s ease;
}
.field input {
  width: 100%;
  border: none;
  background: transparent;
  padding: 10px 12px;
  font: 16px/1.2 "Hiragino Kaku Gothic ProN", "Hiragino Sans GB",
                -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--ink);
  outline: none;
  border-radius: 8px;
}
.field[data-state="error"] { border-color: var(--error); background: var(--error-bg); }
.field[data-state="ok"]    { border-color: var(--ok);    background: var(--ok-bg); }

.msg {
  margin: 8px 0 0;
  font-size: 13px;
  font-family: "Hiragino Kaku Gothic ProN", -apple-system, BlinkMacSystemFont, sans-serif;
}
.msg.error { color: var(--error); font-weight: 500; }
.msg.ok    { color: var(--ok);    font-weight: 500; }

/* Single CTA. Amber gradient, matches the .icns icon. */

.download {
  display: inline-block;
  padding: 14px 32px;
  background: linear-gradient(180deg, var(--amber-2), var(--amber));
  color: white;
  font-weight: 600;
  font-size: 16px;
  border-radius: 10px;
  text-decoration: none;
  box-shadow: 0 8px 20px -8px rgba(228, 113, 24, 0.5);
  transition: transform 0.05s ease, box-shadow 0.15s ease;
}
.download:hover  { box-shadow: 0 12px 28px -8px rgba(228, 113, 24, 0.6); }
.download:active { transform: scale(0.98); }

footer {
  margin: 48px 0 0;
  font-size: 13px;
  color: var(--ink-faint);
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
}
footer a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
footer a:hover { border-bottom-color: var(--ink-soft); }