:root {
  --bg-top: #eef6ff;
  --bg-bottom: #e7f2eb;
  --surface: #ffffff;
  --surface-soft: #f8fbff;
  --text: #10203a;
  --muted: #5a6a80;
  --line: #d8e3f1;
  --line-strong: #b9c9dd;
  --primary: #0e7a6e;
  --primary-strong: #0b5f56;
  --shadow-soft: 0 10px 28px rgba(16, 32, 58, 0.08);
  --radius-lg: 18px;
  --radius-md: 12px;
}

* {
  box-sizing: border-box;
}

html {
  scrollbar-gutter: stable;
}

body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", sans-serif;
  color: var(--text);
  background:
    radial-gradient(1100px 420px at -8% -15%, rgba(20, 113, 190, 0.15) 0%, rgba(20, 113, 190, 0) 72%),
    radial-gradient(920px 360px at 108% 0%, rgba(14, 122, 110, 0.14) 0%, rgba(14, 122, 110, 0) 66%),
    linear-gradient(155deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
  min-height: 100vh;
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 26px 16px 44px;
}

.hero {
  background: linear-gradient(140deg, rgba(255, 255, 255, 0.86) 0%, rgba(248, 252, 255, 0.98) 60%);
  border: 1px solid rgba(185, 201, 221, 0.68);
  border-radius: 22px;
  padding: 20px 22px;
  box-shadow: var(--shadow-soft);
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.55rem, 1.1rem + 1.3vw, 2.2rem);
}

.hero p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.55;
}

.panel {
  background: linear-gradient(180deg, var(--surface) 0%, var(--surface-soft) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 18px;
  margin-top: 16px;
  box-shadow: var(--shadow-soft);
}

.control-group {
  display: grid;
  gap: 8px;
}

.control-group.buttons {
  align-content: end;
  grid-template-columns: 1fr;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 14px;
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #fff;
  padding: 14px;
}

.card h2 {
  margin: 0;
  color: var(--primary-strong);
  font-size: 1.15rem;
}

.hint {
  margin: 6px 0 10px;
  color: var(--muted);
  font-size: 0.93rem;
}

.flow-arrow {
  margin-top: 4px;
  text-align: center;
  font-size: 1.3rem;
  line-height: 1;
  color: #3a4f6d;
}

label {
  font-weight: 700;
  color: #193158;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  padding: 9px 10px;
  font: inherit;
  color: var(--text);
  background: #fff;
}

textarea {
  resize: vertical;
  min-height: 164px;
}

button {
  border: 0;
  border-radius: 10px;
  padding: 10px 12px;
  font-weight: 700;
  cursor: pointer;
  background: linear-gradient(180deg, #f0f4f8 0%, #e0e8f1 100%);
  color: #1a2f4d;
  box-shadow: 0 2px 8px rgba(16, 32, 58, 0.12);
}

button.primary {
  background: linear-gradient(180deg, var(--primary) 0%, var(--primary-strong) 100%);
  color: #fff;
}

.inline-controls {
  margin-top: 10px;
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 8px;
  align-items: center;
}

.output {
  margin: 12px 0 0;
  min-height: 42px;
  overflow-x: auto;
  overflow-y: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f6faff;
  padding: 10px;
  white-space: nowrap;
  line-height: 1.35;
}

.result-tools {
  margin-top: 10px;
  display: flex;
  align-items: end;
  gap: 8px;
  flex-wrap: wrap;
}

.result-tools-item {
  display: grid;
  gap: 4px;
  min-width: 170px;
}

.result-tools-item label {
  font-size: 0.82rem;
  font-weight: 700;
  color: #3a4f6d;
}

.result-tools-item select {
  height: 34px;
  padding: 4px 8px;
}

.compact-button {
  height: 34px;
  padding: 6px 10px;
  font-size: 0.9rem;
}

.copy-toast {
  position: fixed;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%) translateY(8px);
  background: rgba(16, 32, 58, 0.92);
  color: #fff;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.86rem;
  line-height: 1;
  pointer-events: none;
  opacity: 0;
  transition: opacity 160ms ease, transform 160ms ease;
  z-index: 50;
}

.copy-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.guide-content ul {
  margin: 10px 0 0;
  padding-left: 20px;
}

@media (max-width: 640px) {
  .inline-controls {
    grid-template-columns: 1fr;
  }
}