:root {
  /* Flat Minimalist Pastel Theme */
  --bg: #fffcf8;
  --surface: transparent;
  --text: #1c1f1c;
  --text-muted: #b7b6ae;
  --border: #b7b6ae;
  --primary: #84b05b;
  --primary-hover: #f25157;
  --error: #f25157;
  --success: #84b05b;

  --font-sans: "Helvetica", system-ui, -apple-system, sans-serif;
  --font-mono: monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem 1.5rem;
}

.container {
  width: 100%;
  max-width: 900px;
}

header {
  margin-bottom: 4rem;
}

h1 {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 300;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1;
  margin-bottom: 1.5rem;
  text-transform: lowercase;
}

header p {
  color: var(--text);
  font-size: 1rem;
  font-weight: 400;
  max-width: 900px;
  border-left: 1px solid var(--border);
  padding-left: 1rem;
}

.card {
  background: var(--surface);
  border: none;
  border-radius: 0;
  padding: 0;
  box-shadow: none;
  margin-bottom: 2rem;
}

.form-group {
  margin-bottom: 3rem;
}

label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: lowercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--primary);
}

input[type="text"] {
  width: 100%;
  padding: 0.5rem 0;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 300;
  transition: all 0.2s;
}

input[type="text"]::placeholder {
  color: rgba(60, 62, 40, 0.3);
}

input:focus {
  outline: none;
  border-bottom-color: var(--text);
}

.drop-zone {
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 4rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  background: transparent;
  position: relative;
}

.drop-zone:hover,
.drop-zone.dragover {
  background: var(--text);
  color: var(--bg);
}

.drop-zone:hover .drop-zone-content,
.drop-zone.dragover .drop-zone-content {
  color: var(--bg);
}

.drop-zone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  color: var(--text);
  font-weight: 500;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: lowercase;
}

.hidden-input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.file-list {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  background: transparent;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 400;
}

.file-item-remove {
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  font-size: 1rem;
  font-weight: 300;
  line-height: 1;
}

.file-item-remove:hover {
  color: var(--error);
}

.btn {
  width: 100%;
  font-family: var(--font-mono);
  padding: 1.25rem;
  background: var(--text);
  color: var(--bg);
  border: none;
  border-radius: 0;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: lowercase;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
}

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

.btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  margin-top: 1.5rem;
}

.btn-secondary:hover:not(:disabled) {
  background: var(--text);
  color: var(--bg);
}

.hidden {
  display: none !important;
}

.status-box {
  margin-top: 2rem;
  padding: 3rem 2rem;
  text-align: center;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 0;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.8rem;
  text-transform: lowercase;
}

.loader {
  border: 2px solid var(--border);
  border-top: 2px solid var(--bg);
  background: var(--text);
  border-radius: 0; /* Square loader for brutalist look */
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 0 auto 1.5rem;
}

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

.success-box,
.error-box {
  padding: 3rem 2rem;
  border: 1px solid var(--border);
  border-radius: 0;
  margin-top: 2rem;
  text-align: center;
  font-weight: 500;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

.success-box {
  background: var(--text);
  color: var(--bg);
}

.success-box h3,
.error-box h3 {
  font-size: 1.25rem;
  font-weight: 300;
  text-transform: lowercase;
  margin-bottom: 1rem;
}

.error-box {
  background: var(--error);
  color: white;
  border-color: var(--error);
}