:root {
  --bg: #fbf8f3;
  --surface: rgba(255, 255, 255, 0.78);
  --surface-strong: rgba(255, 255, 255, 0.92);
  --line: rgba(43, 52, 69, 0.12);
  --text: #253049;
  --muted: #5f6a82;
  --accent: #ff6b6b;
  --accent-2: #4ecdc4;
  --accent-3: #ffd166;
  --shadow: 0 24px 70px rgba(56, 69, 103, 0.14);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI Variable", "Yu Gothic UI", "Hiragino Kaku Gothic ProN", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 107, 107, 0.18), transparent 30%),
    radial-gradient(circle at 82% 12%, rgba(78, 205, 196, 0.2), transparent 28%),
    radial-gradient(circle at 90% 80%, rgba(255, 209, 102, 0.18), transparent 24%),
    linear-gradient(180deg, #fffdf9 0%, #f8f3ed 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.45) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.4) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.3), transparent 85%);
}

.page-shell {
  width: min(1400px, calc(100% - 32px));
  margin: 0 auto;
  padding: 20px 0 48px;
}

.hero {
  position: relative;
  display: grid;
  gap: 12px;
  padding: 24px 28px;
  border-radius: 28px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.72));
  border: 1px solid rgba(255, 255, 255, 0.8);
  box-shadow: var(--shadow);
}

.eyebrow,
.section-label,
.ai-label,
.summary-label {
  margin: 0 0 10px;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero-topline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 20px;
}

.hero-mini-note {
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted);
}

.hero h1,
.panel h2,
.subsection-head h3,
.output-card h3 {
  margin: 0;
  line-height: 1.1;
}

.hero h1 {
  font-family: "Bahnschrift", "Trebuchet MS", sans-serif;
  font-size: clamp(2rem, 3vw, 3rem);
  letter-spacing: -0.04em;
}

.hero-text {
  max-width: 920px;
  margin: 10px 0 0;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--muted);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(340px, 0.9fr) minmax(360px, 1.1fr);
  gap: 24px;
  margin-top: 24px;
}

.panel {
  padding: 24px;
  border-radius: var(--radius-xl);
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.85);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.panel h2 {
  font-size: clamp(1.45rem, 2vw, 2rem);
  letter-spacing: -0.03em;
}

.header-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.preset-box {
  margin-top: 20px;
  padding: 16px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid var(--line);
}

.preset-box label,
.form-grid label {
  display: grid;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
}

.assist-select,
.preset-box select,
.form-grid input,
.form-grid textarea {
  width: 100%;
  border: 1px solid rgba(52, 64, 92, 0.14);
  border-radius: 14px;
  padding: 13px 14px;
  background: var(--surface-strong);
  color: var(--text);
  font: inherit;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.preset-box select:focus,
.assist-select:focus,
.form-grid input:focus,
.form-grid textarea:focus,
.output-area:focus {
  outline: none;
  border-color: rgba(255, 107, 107, 0.45);
  box-shadow: 0 0 0 4px rgba(255, 107, 107, 0.12);
  transform: translateY(-1px);
}

.assist-select,
.preset-box select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  padding-right: 46px;
  color: #66728d;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%2377859d' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  background-size: 14px;
}

.form-grid input::placeholder,
.form-grid textarea::placeholder,
.output-area::placeholder {
  color: #8e97ab;
}

.form-grid {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.form-grid textarea {
  min-height: 88px;
  resize: vertical;
}

.subsection-card {
  display: grid;
  gap: 14px;
  margin-top: 6px;
  padding: 18px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid rgba(43, 52, 69, 0.08);
}

.subsection-head {
  display: grid;
  gap: 6px;
}

.subsection-help {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: #67748f;
}

.subsection-head h3 {
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

.subsection-grid {
  display: grid;
  gap: 14px;
}

.field-help {
  margin-top: -2px;
  font-weight: 400;
  font-size: 0.84rem;
  line-height: 1.6;
  color: #74809a;
}

.font-preview-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: -2px;
}

.font-preview-card {
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.66);
  border: 1px solid rgba(43, 52, 69, 0.08);
}

.preview-label,
.preview-meta,
.font-preview-sample {
  margin: 0;
}

.preview-label {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #7d889f;
}

.preview-meta {
  margin-top: 6px;
  font-size: 0.88rem;
  color: #5f6a82;
}

.font-preview-sample {
  margin-top: 12px;
  color: #31405f;
}

.font-latin-preview {
  font-size: 1.35rem;
  line-height: 1.45;
}

.font-ja-preview {
  font-size: 1.1rem;
  line-height: 1.7;
}

button {
  border: none;
  font: inherit;
  cursor: pointer;
}

.ghost-button,
.copy-button {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--text);
  border: 1px solid rgba(43, 52, 69, 0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.primary-button {
  padding: 13px 18px;
  border-radius: 16px;
  color: #fff;
  background: linear-gradient(135deg, #ff6b6b 0%, #ff8f70 45%, #ffa95a 100%);
  box-shadow: 0 18px 32px rgba(255, 107, 107, 0.25);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.ghost-button:hover,
.copy-button:hover,
.primary-button:hover {
  transform: translateY(-2px);
}

.primary-button:hover {
  box-shadow: 0 24px 36px rgba(255, 107, 107, 0.32);
}

.summary-card {
  margin-top: 20px;
  padding: 18px 18px 20px;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(78, 205, 196, 0.16), rgba(255, 255, 255, 0.82)),
    rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(78, 205, 196, 0.18);
}

.summary-card p {
  margin: 0;
  line-height: 1.7;
}

.implementation-guide {
  padding: 14px 16px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(78, 205, 196, 0.14), rgba(255, 255, 255, 0.78));
  border: 1px solid rgba(78, 205, 196, 0.16);
}

.implementation-guide p {
  margin: 0;
  line-height: 1.75;
}

.output-tabs {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}

.tab-button {
  padding: 11px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.62);
  color: #67748f;
  border: 1px solid rgba(43, 52, 69, 0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.tab-button.is-active {
  background: linear-gradient(135deg, rgba(255, 107, 107, 0.16), rgba(255, 169, 90, 0.18));
  color: var(--text);
  box-shadow: 0 10px 24px rgba(255, 107, 107, 0.12);
}

.tab-panel {
  display: none;
  margin-top: 18px;
}

.tab-panel.is-active {
  display: block;
}

.output-stack {
  display: grid;
  gap: 18px;
}

.output-card {
  padding: 18px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
}

.output-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.output-card h3 {
  font-size: 1.12rem;
}

.output-area {
  width: 100%;
  min-height: 240px;
  border: 1px solid rgba(52, 64, 92, 0.12);
  border-radius: 18px;
  padding: 16px;
  background: rgba(252, 251, 249, 0.96);
  color: var(--text);
  font: inherit;
  line-height: 1.75;
  resize: vertical;
}

.implementation-area {
  min-height: 520px;
}

.output-help {
  margin: 0 0 14px;
  font-size: 0.94rem;
  line-height: 1.75;
  color: #66728d;
}

.toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  padding: 12px 16px;
  border-radius: 999px;
  color: #fff;
  background: rgba(37, 48, 73, 0.92);
  box-shadow: 0 16px 36px rgba(37, 48, 73, 0.2);
  animation: toast-in 2s ease forwards;
}

@keyframes toast-in {
  0% {
    opacity: 0;
    transform: translateY(12px);
  }
  10%, 80% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(8px);
  }
}

@media (max-width: 1120px) {
  .workspace {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(100% - 18px, 100%);
    padding-top: 18px;
  }

  .hero,
  .panel {
    padding: 20px;
    border-radius: 24px;
  }

  .hero-topline,
  .panel-header,
  .output-card-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-actions {
    width: 100%;
  }

  .output-tabs {
    flex-wrap: wrap;
  }

  .font-preview-panel {
    grid-template-columns: 1fr;
  }
}