:root {
  --bg-start: #0d1b12;
  --bg-end: #142a1c;
  --fire-orange: #e8792a;
  --fire-orange-dark: #c2601a;
  --leaf-green: #3f7a4f;
  --text-light: #f4ede1;
  --text-muted: #c9bfae;
  --surface: rgba(255, 255, 255, 0.06);
  --surface-border: rgba(255, 255, 255, 0.12);
  --error: #e05b4f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Segoe UI', Arial, sans-serif;
  color: var(--text-light);
  background: radial-gradient(circle at top, var(--bg-end), var(--bg-start) 70%);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

.site-header {
  text-align: center;
  padding: 48px 20px 24px;
}

.brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.flame {
  font-size: 2.5rem;
}

.brand h1 {
  margin: 0;
  font-size: 2.4rem;
  letter-spacing: 0.15em;
  background: linear-gradient(90deg, var(--fire-orange), var(--leaf-green));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline {
  margin: 0;
  letter-spacing: 0.3em;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.subtitle {
  margin: 16px 0 4px;
  font-size: 1.1rem;
  color: var(--text-light);
}

.claim {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  max-width: 560px;
}

main {
  width: 100%;
  display: flex;
  justify-content: center;
  padding: 0 20px 40px;
}

#text-generation-tool {
  width: 100%;
  max-width: 640px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 16px;
  padding: 28px;
  backdrop-filter: blur(6px);
}

#topic {
  width: 100%;
  padding: 14px 16px;
  margin-bottom: 16px;
  font-size: 16px;
  font-family: inherit;
  border-radius: 10px;
  border: 1px solid var(--surface-border);
  background: rgba(0, 0, 0, 0.25);
  color: var(--text-light);
  resize: vertical;
}

#topic::placeholder {
  color: var(--text-muted);
}

#topic:focus,
#generate-button:focus-visible,
#copy-button:focus-visible {
  outline: 2px solid var(--fire-orange);
  outline-offset: 2px;
}

#generate-button {
  display: block;
  width: 100%;
  padding: 14px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.05em;
  border: none;
  border-radius: 10px;
  color: #fff;
  background: linear-gradient(90deg, var(--fire-orange), var(--fire-orange-dark));
  cursor: pointer;
  transition: filter 0.2s ease, transform 0.1s ease;
}

#generate-button:hover:not(:disabled) {
  filter: brightness(1.1);
}

#generate-button:active:not(:disabled) {
  transform: scale(0.99);
}

#generate-button:disabled {
  opacity: 0.6;
  cursor: progress;
}

.error-box {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: 10px;
  background: rgba(224, 91, 79, 0.15);
  border: 1px solid var(--error);
  color: #ffd9d4;
  font-size: 0.9rem;
}

.result-container {
  margin-top: 20px;
}

.result-content {
  display: flex;
}

#result {
  flex: 1;
  min-height: 280px;
  padding: 16px;
  font-size: 16px;
  line-height: 1.5;
  border-radius: 10px;
  border: 1px solid var(--surface-border);
  background: rgba(0, 0, 0, 0.25);
  color: var(--text-light);
  resize: vertical;
}

.copy-button-container {
  margin-top: 10px;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
}

.copy-feedback {
  font-size: 0.85rem;
  color: var(--leaf-green);
}

#copy-button {
  padding: 10px 16px;
  font-size: 14px;
  border: none;
  border-radius: 8px;
  color: #fff;
  background: var(--leaf-green);
  cursor: pointer;
  transition: filter 0.2s ease;
}

#copy-button:hover {
  filter: brightness(1.1);
}

.loader {
  display: block;
  margin: 36px auto 0;
  border: 6px solid rgba(255, 255, 255, 0.15);
  border-top: 6px solid var(--fire-orange);
  border-radius: 50%;
  width: 42px;
  height: 42px;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.site-footer {
  padding: 20px;
  color: var(--text-muted);
  font-size: 0.8rem;
}