:root {
  --bg-start: #f4efe5;
  --bg-end: #d7e4ef;
  --card: rgba(255, 255, 255, 0.86);
  --card-border: rgba(32, 32, 32, 0.08);
  --text: #1f2b33;
  --muted: #5f6f7b;
  --primary: #0f766e;
  --primary-hover: #0b5f58;
  --accent: #e3b869;
  --output-bg: #132028;
  --output-text: #eef8ff;
  --shadow: 0 24px 48px rgba(15, 31, 45, 0.12);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Manrope", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 10% 10%, #fff1d3 0%, transparent 30%),
    radial-gradient(circle at 90% 15%, #d3f2ff 0%, transparent 34%),
    linear-gradient(145deg, var(--bg-start), var(--bg-end));
}

.shell {
  width: min(1100px, 92vw);
  margin: clamp(1rem, 2.5vw, 2.25rem) auto;
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

.panel {
  background: var(--card);
  backdrop-filter: blur(6px);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: clamp(1rem, 2.2vw, 2rem);
}

.hero h1 {
  margin: 0.25rem 0 0.25rem;
  font-family: "Sora", sans-serif;
  font-size: clamp(1.45rem, 1.2rem + 1.5vw, 2.2rem);
  line-height: 1.18;
}

.eyebrow {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--primary);
  font-weight: 700;
}

.subtitle {
  margin: 0.35rem 0 0;
  color: var(--muted);
  max-width: 62ch;
}

.convert-form {
  margin-top: 1rem;
  display: grid;
  gap: 1rem;
}

.drop-zone {
  border: 2px dashed rgba(15, 118, 110, 0.4);
  border-radius: 16px;
  padding: clamp(1rem, 2.5vw, 1.75rem);
  background: linear-gradient(180deg, #f7fdfc, #eef8f6);
  display: grid;
  gap: 0.45rem;
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.drop-zone:hover {
  transform: translateY(-1px);
  border-color: var(--primary);
}

.drop-zone.is-dragover {
  border-color: var(--accent);
  background: linear-gradient(180deg, #fff8e9, #fff3da);
}

.drop-zone input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
}

.drop-title {
  font-weight: 800;
  font-size: clamp(1rem, 0.95rem + 0.45vw, 1.25rem);
}

.drop-help {
  color: var(--muted);
  font-size: 0.9rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

button {
  border: 0;
  border-radius: 12px;
  padding: 0.7rem 1rem;
  font-size: 0.95rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: transform 120ms ease, opacity 120ms ease, background 120ms ease;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
}

#convert-btn {
  background: var(--primary);
  color: white;
}

#convert-btn:hover:not(:disabled) {
  background: var(--primary-hover);
}

.status {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.result-panel {
  display: grid;
  gap: 0.8rem;
}

.result-head {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

.result-head h2 {
  margin: 0;
  font-size: 1.05rem;
  font-family: "Sora", sans-serif;
}

.result-actions {
  display: flex;
  gap: 0.55rem;
}

.result-actions button {
  background: #dbe7ef;
  color: #163149;
}

.output {
  margin: 0;
  background: linear-gradient(180deg, #182b36, var(--output-bg));
  color: var(--output-text);
  border-radius: 14px;
  padding: 1rem;
  min-height: min(52vh, 420px);
  max-height: 58vh;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: "SFMono-Regular", "Consolas", "Liberation Mono", monospace;
  font-size: 0.86rem;
  line-height: 1.45;
}

@media (min-width: 900px) {
  .shell {
    grid-template-columns: 1.05fr 1fr;
  }
}