:root {
  --bg: #070815;
  --bg-elevated: #0f1022;
  --bg-elevated-soft: #151632;
  --accent: #4f46e5;
  --accent-soft: rgba(79, 70, 229, 0.16);
  --accent-strong: rgba(129, 140, 248, 0.32);
  --border-subtle: rgba(148, 163, 184, 0.25);
  --text-main: #e5e7eb;
  --text-soft: #9ca3af;
  --text-muted: #6b7280;
  --danger: #ef4444;
  --radius-lg: 18px;
  --transition: 160ms ease-out;
  --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.7);
}

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

html,
body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #111827 0, #020617 50%, #000 100%);
  color: var(--text-main);
  min-height: 100%;
}

body {
  display: flex;
  flex-direction: column;
}

/* Layout */

.app-header {
  max-width: 1080px;
  margin: 18px auto 0;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  backdrop-filter: blur(20px);
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.35);
  background: radial-gradient(circle at top left, rgba(79, 70, 229, 0.18), transparent 45%),
              radial-gradient(circle at top right, rgba(56, 189, 248, 0.18), transparent 45%),
              rgba(15, 23, 42, 0.92);
  box-shadow: 0 20px 60px rgba(15, 23, 42, 0.9);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.logo-dot {
  width: 18px;
  height: 18px;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 30%, #ffffff, #a5b4fc 40%, #4f46e5 70%, #0f172a 100%);
  box-shadow: 0 0 18px rgba(129, 140, 248, 0.7);
}

.brand-text {
  font-size: 0.95rem;
}

.nav-links {
  display: flex;
  gap: 16px;
  font-size: 0.9rem;
}

.nav-links a {
  color: var(--text-soft);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: var(--transition);
}

.nav-links a:hover {
  border-color: rgba(148, 163, 184, 0.5);
  color: #e5e7eb;
  background: rgba(15, 23, 42, 0.9);
}

.app-main {
  flex: 1;
  max-width: 1080px;
  margin: 18px auto 40px;
  padding: 0 20px 20px;
}

/* Hero */

.hero {
  padding: 26px 22px 24px;
  border-radius: 24px;
  background: radial-gradient(circle at top left, rgba(79, 70, 229, 0.35), transparent 60%),
              radial-gradient(circle at bottom right, rgba(8, 47, 73, 0.7), transparent 65%),
              linear-gradient(135deg, #020617, #020617, #020617);
  border: 1px solid rgba(148, 163, 184, 0.45);
  box-shadow: var(--shadow-soft);
}

.hero h1 {
  margin: 0 0 10px;
  font-size: clamp(1.8rem, 3vw, 2.2rem);
}

.hero p {
  margin: 0 0 14px;
  color: var(--text-soft);
}

.hero-bullets {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.hero-bullets li {
  font-size: 0.85rem;
  border-radius: 999px;
  padding: 6px 12px;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.4);
}

/* Controls */

.controls {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.control-group {
  padding: 12px 14px;
  border-radius: 18px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 14px 35px rgba(15, 23, 42, 0.8);
}

.control-group label {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text-soft);
}

#qualityValue {
  color: #a5b4fc;
}

input[type="range"] {
  width: 100%;
}

select {
  width: 100%;
  padding: 7px 10px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: #020617;
  color: var(--text-main);
  font-size: 0.86rem;
}

/* Uploader */

.uploader {
  margin-top: 22px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.drop-zone {
  flex: 1;
  border-radius: 24px;
  border: 1.5px dashed rgba(148, 163, 184, 0.7);
  background: radial-gradient(circle at top, rgba(79, 70, 229, 0.12), transparent 55%),
              rgba(15, 23, 42, 0.98);
  padding: 22px 18px;
  text-align: center;
  position: relative;
  cursor: pointer;
  transition: var(--transition);
}

.drop-zone.dragover {
  border-color: #a5b4fc;
  box-shadow: 0 0 0 1px rgba(129, 140, 248, 0.4),
              0 18px 40px rgba(30, 64, 175, 0.8);
  transform: translateY(-1px);
}

#fileInput {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.drop-title {
  font-size: 1rem;
  margin: 0 0 4px;
}

.drop-subtitle {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.btn-secondary {
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.7);
  background: rgba(15, 23, 42, 0.95);
  color: var(--text-soft);
  font-size: 0.85rem;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition);
}

.btn-secondary:hover {
  border-color: #f97316;
  color: #fed7aa;
  box-shadow: 0 14px 30px rgba(248, 115, 22, 0.35);
}

/* Results */

.results-section {
  margin-top: 26px;
  padding: 16px 0 0;
}

.results-section h2 {
  font-size: 1.1rem;
  margin: 0 0 12px;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.results-placeholder {
  grid-column: 1 / -1;
  margin: 0;
  padding: 16px 14px;
  font-size: 0.9rem;
  text-align: center;
  border-radius: 18px;
  border: 1px dashed rgba(148, 163, 184, 0.45);
  background: rgba(15, 23, 42, 0.9);
  color: var(--text-muted);
}

.result-card {
  border-radius: 18px;
  padding: 12px 12px 10px;
  background: var(--bg-elevated-soft);
  border: 1px solid rgba(148, 163, 184, 0.35);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.9);
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.85rem;
}

.result-header {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: baseline;
}

.result-name {
  font-weight: 500;
  color: #e5e7eb;
  word-break: break-all;
}

.result-format {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.98);
  border: 1px solid rgba(148, 163, 184, 0.5);
  color: #a5b4fc;
}

.preview-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.preview-box {
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid rgba(30, 64, 175, 0.5);
  background: #020617;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-box img {
  max-width: 100%;
  display: block;
}

.result-stats {
  display: flex;
  justify-content: space-between;
  gap: 6px;
}

.result-stats span {
  font-size: 0.78rem;
  color: var(--text-soft);
}

.result-stats .good {
  color: #4ade80;
}

.result-actions {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-top: 2px;
}

.btn-download,
.btn-small {
  flex: 1;
  padding: 7px 10px;
  font-size: 0.8rem;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  transition: var(--transition);
}

.btn-download {
  background: linear-gradient(135deg, #4f46e5, #0ea5e9);
  color: #f9fafb;
  box-shadow: 0 12px 28px rgba(37, 99, 235, 0.75);
}

.btn-download:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 45px rgba(37, 99, 235, 0.9);
}

.btn-small {
  background: rgba(15, 23, 42, 0.96);
  color: var(--text-soft);
  border-color: rgba(148, 163, 184, 0.6);
}

.btn-small:hover {
  border-color: #a5b4fc;
  color: #e5e7eb;
}

/* Footer */

.app-footer {
  text-align: center;
  font-size: 0.8rem;
  padding: 14px 12px 20px;
  color: var(--text-muted);
}

.app-footer a {
  color: #a5b4fc;
  text-decoration: none;
}

.app-footer a:hover {
  text-decoration: underline;
}

/* Misc */

.hidden {
  display: none;
}

/* Responsive */

@media (max-width: 720px) {
  .app-header {
    flex-direction: column;
    gap: 8px;
    border-radius: 24px;
  }

  .controls {
    grid-template-columns: 1fr;
  }

  .uploader {
    flex-direction: column;
    align-items: stretch;
  }

  .btn-secondary {
    width: 100%;
  }
}