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

:root {
  --bg: #0c0f14;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-hover: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.1);
  --text: #f0f2f5;
  --muted: #8b95a5;
  --accent: #6ee7b7;
  --accent-dim: rgba(110, 231, 183, 0.15);
  --danger: #f87171;
  --radius: 16px;
  --font: "Instrument Sans", system-ui, sans-serif;
}

body {
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  line-height: 1.5;
}

.backdrop {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 10%, rgba(110, 231, 183, 0.12), transparent),
    radial-gradient(ellipse 60% 50% at 80% 90%, rgba(99, 102, 241, 0.1), transparent);
  pointer-events: none;
}

.container {
  width: 100%;
  max-width: 480px;
  position: relative;
}

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

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.logo svg {
  color: var(--accent);
}

.subtitle {
  color: var(--muted);
  font-size: 0.95rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  backdrop-filter: blur(12px);
}

.field-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}

.folder-input-wrap {
  display: flex;
  align-items: center;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0 0.85rem;
  margin-bottom: 1.25rem;
  transition: border-color 0.2s;
}

.folder-input-wrap:focus-within {
  border-color: rgba(110, 231, 183, 0.4);
}

.folder-prefix {
  color: var(--muted);
  font-size: 0.95rem;
  user-select: none;
}

#folder {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.75rem 0.5rem;
}

#folder::placeholder {
  color: rgba(139, 149, 165, 0.5);
}

.dropzone {
  border: 1.5px dashed var(--border);
  border-radius: 12px;
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  outline: none;
}

.dropzone:hover,
.dropzone:focus-visible {
  border-color: rgba(110, 231, 183, 0.35);
  background: var(--surface-hover);
}

.dropzone.dragover {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.dropzone.disabled,
.dropzone.disabled:hover,
.dropzone.disabled:focus-visible {
  opacity: 0.45;
  cursor: not-allowed;
  border-color: var(--border);
  background: transparent;
  pointer-events: none;
}

.disabled-banner {
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.25);
  color: var(--danger);
  border-radius: 10px;
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  margin-bottom: 1.25rem;
  text-align: center;
}

.disabled-banner.hidden {
  display: none;
}

#folder:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.link-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  text-decoration: none;
}

.dropzone-icon {
  color: var(--muted);
  margin-bottom: 0.75rem;
  transition: color 0.2s, transform 0.2s;
}

.dropzone:hover .dropzone-icon,
.dropzone.dragover .dropzone-icon {
  color: var(--accent);
  transform: translateY(-2px);
}

.dropzone-title {
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.dropzone-hint {
  font-size: 0.875rem;
  color: var(--muted);
}

.link-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.link-btn:hover {
  opacity: 0.8;
}

.file-list {
  list-style: none;
  margin-top: 1rem;
  max-height: 200px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.file-list.hidden {
  display: none;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.55rem 0.75rem;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 8px;
  font-size: 0.875rem;
}

.file-item-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.file-item-size {
  color: var(--muted);
  flex-shrink: 0;
  font-size: 0.8rem;
}

.file-item-remove {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  padding: 0.15rem;
  line-height: 1;
  border-radius: 4px;
  transition: color 0.15s;
}

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

.upload-btn {
  width: 100%;
  margin-top: 1.25rem;
  padding: 0.85rem 1.5rem;
  background: var(--accent);
  color: #0c0f14;
  border: none;
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.15s;
  position: relative;
  overflow: hidden;
}

.upload-btn:hover:not(:disabled) {
  opacity: 0.92;
  transform: translateY(-1px);
}

.upload-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.upload-btn.uploading {
  pointer-events: none;
}

.upload-btn.uploading .btn-label {
  opacity: 0;
}

.btn-progress {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
}

.btn-progress.hidden {
  display: none;
}

.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(1rem);
  background: rgba(20, 24, 32, 0.95);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
  max-width: 90vw;
  text-align: center;
}

.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast.success {
  border-color: rgba(110, 231, 183, 0.3);
  color: var(--accent);
}

.toast.error {
  border-color: rgba(248, 113, 113, 0.3);
  color: var(--danger);
}

.toast.hidden {
  display: none;
}