:root {
  --bg: #0f0f12;
  --surface: #18181c;
  --border: #2a2a30;
  --text: #e8e8ec;
  --text-muted: #888896;
  --accent: #22c55e;
  --accent-hover: #16a34a;
  --error: #ef4444;
  --radius: 12px;
  --font-sans: "DM Sans", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 480px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  text-align: center;
  margin-bottom: 2rem;
}

.header h1 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.main {
  flex: 1;
}

.flash {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0.75rem 1rem;
  background: rgba(239, 68, 68, 0.12);
  color: var(--error);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius);
  font-size: 0.9rem;
}

.upload-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.drop-zone {
  position: relative;
  padding: 2rem;
  background: var(--surface);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s, background 0.2s;
  cursor: pointer;
}

.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--accent);
  background: rgba(34, 197, 94, 0.06);
}

.drop-zone input[type="file"] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.drop-text {
  display: block;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.drop-zone.has-file .drop-text {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.btn {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  padding: 0.875rem 1.25rem;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.hint {
  margin: 1rem 0 0;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.footer {
  margin-top: auto;
  padding-top: 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.footer a {
  color: var(--text-muted);
  text-decoration: underline;
}

.footer a:hover {
  color: var(--text);
}