:root {
  --color-primary: #4a90e2;
  --color-primary-hover: #357abd;
  --color-primary-tint: #eef4fc;
  --color-text: #333;
  --color-secondary-text: #666;
  --color-muted: #888;
  --color-border: #ccc;
  --color-bg: #f5f5f5;
}

* {
  box-sizing: border-box;
}

body {
  font-family: sans-serif;
  margin: 0;
  padding: 40px 20px;
  background-color: var(--color-bg);
  color: var(--color-text);
  position: relative;
  overflow-x: hidden;
}

header,
main {
  max-width: 680px;
  margin: 0 auto;
  position: relative;
}

.hero-blob {
  position: absolute;
  top: -60px;
  right: -80px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(74, 144, 226, 0.18), rgba(74, 144, 226, 0) 70%);
  z-index: 0;
  pointer-events: none;
}

header {
  margin-bottom: 40px;
}

h1 {
  font-size: 28px;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  width: 26px;
  height: 26px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.title-text {
  background: linear-gradient(90deg, var(--color-text) 0%, var(--color-primary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: -0.3px;
}

.title-underline {
  display: block;
  width: 240px;
  max-width: 70%;
  height: 10px;
  margin: -4px 0 10px 34px;
  stroke: var(--color-primary);
  stroke-width: 2;
  fill: none;
  stroke-linecap: round;
  opacity: 0.55;
}

header p {
  color: var(--color-secondary-text);
  margin: 0;
}

.card {
  background: #fff;
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group:last-child {
  margin-bottom: 0;
}

label {
  display: block;
  font-weight: bold;
  margin-bottom: 4px;
}

small {
  display: block;
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 8px;
}

input,
textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-family: inherit;
  font-size: 15px;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

textarea {
  resize: vertical;
}

.api-key-row {
  display: flex;
  gap: 8px;
}

.api-key-row input {
  flex: 1;
}

.scene-group,
.lang-toggle {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.scene-btn,
.lang-btn {
  background: #fff;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: 8px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
}

.scene-btn:hover,
.lang-btn:hover {
  border-color: var(--color-primary);
}

.scene-btn.active,
.lang-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border: none;
  padding: 12px 24px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 15px;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
}

.btn-primary:disabled {
  background: var(--color-border);
  cursor: not-allowed;
}

.btn-outline {
  background: #fff;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  padding: 10px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
}

.btn-outline:hover {
  background: var(--color-primary-tint);
}

.btn-outline:disabled {
  color: var(--color-muted);
  border-color: var(--color-border);
  cursor: not-allowed;
  background: #fff;
}

.btn-generate {
  width: 100%;
  margin-top: 8px;
}

.result-box {
  white-space: pre-wrap;
  line-height: 1.6;
  padding: 12px;
  background: var(--color-bg);
  border-radius: 6px;
  min-height: 60px;
  margin-bottom: 12px;
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.error-text {
  color: #c0392b;
  font-size: 13px;
  margin: 4px 0 12px;
}

@media (max-width: 480px) {
  body {
    padding: 24px 16px;
  }

  .api-key-row {
    flex-direction: column;
  }

  .btn-outline {
    flex: 1;
    text-align: center;
  }
}