:root {
  --arv-primary: #0d6efd;
  --arv-primary-dark: #0a58ca;
  --arv-success: #198754;
  --arv-surface: #ffffff;
  --arv-bg: #f0f4f8;
  --arv-bg-accent: #e8eef5;
  --arv-text: #1e293b;
  --arv-muted: #64748b;
  --arv-border: #dbe3ec;
  --arv-radius: 1rem;
  --arv-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --arv-checker-a: #d1d5db;
  --arv-checker-b: #f8fafc;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: Vazirmatn, Tahoma, sans-serif;
  background:
    radial-gradient(circle at top right, rgba(13, 110, 253, 0.08), transparent 28%),
    linear-gradient(180deg, var(--arv-bg) 0%, var(--arv-bg-accent) 100%);
  color: var(--arv-text);
  min-height: 100vh;
}

a {
  text-decoration: none;
}

.arv-navbar {
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid var(--arv-border);
}

.arv-brand {
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--arv-text);
}

.arv-brand span {
  color: var(--arv-primary);
}

.arv-hero {
  padding: 4rem 0 2.5rem;
}

.arv-hero-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.25;
}

.arv-hero-lead {
  color: var(--arv-muted);
  font-size: 1.05rem;
  max-width: 36rem;
}

.arv-card {
  background: var(--arv-surface);
  border: 1px solid var(--arv-border);
  border-radius: var(--arv-radius);
  box-shadow: var(--arv-shadow);
}

.arv-tool-card {
  display: block;
  height: 100%;
  padding: 1.5rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  color: inherit;
}

.arv-tool-card:hover {
  transform: translateY(-4px);
  border-color: rgba(13, 110, 253, 0.35);
  box-shadow: 0 16px 40px rgba(13, 110, 253, 0.12);
  color: inherit;
}

.arv-tool-icon {
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 0.9rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(13, 110, 253, 0.1);
  color: var(--arv-primary);
  font-size: 1.35rem;
  margin-bottom: 1rem;
}

.arv-tool-card.coming-soon {
  opacity: 0.72;
  pointer-events: none;
}

.arv-badge-soft {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: rgba(13, 110, 253, 0.1);
  color: var(--arv-primary);
  font-size: 0.85rem;
  font-weight: 600;
}

.arv-dropzone {
  border: 2px dashed #94a3b8;
  border-radius: var(--arv-radius);
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
  background: linear-gradient(180deg, #fff, #f8fbff);
}

.arv-dropzone:hover,
.arv-dropzone.is-dragover {
  border-color: var(--arv-primary);
  background: rgba(13, 110, 253, 0.04);
}

.arv-dropzone.is-dragover {
  transform: scale(1.01);
}

.arv-checker {
  background-color: var(--arv-checker-b);
  background-image:
    linear-gradient(45deg, var(--arv-checker-a) 25%, transparent 25%),
    linear-gradient(-45deg, var(--arv-checker-a) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--arv-checker-a) 75%),
    linear-gradient(-45deg, transparent 75%, var(--arv-checker-a) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}

.arv-preview-frame {
  min-height: 320px;
  border-radius: 0.85rem;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.arv-preview-frame img {
  max-width: 100%;
  max-height: 360px;
  object-fit: contain;
}

.arv-compare-frame {
  height: 210px;
  border-radius: 0.85rem;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.arv-compare-frame img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.arv-filter-item {
  border: 2px solid transparent;
  border-radius: 0.75rem;
  overflow: hidden;
  cursor: pointer;
  background: #0f172a;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.arv-filter-item:hover {
  transform: translateY(-2px);
}

.arv-filter-item.active {
  border-color: var(--arv-primary);
}

.arv-filter-item img {
  width: 100%;
  height: 64px;
  object-fit: cover;
  display: block;
}

.arv-filter-label {
  color: #fff;
  font-size: 0.75rem;
  text-align: center;
  padding: 0.35rem;
}

.arv-format-btn.active,
.arv-aspect-btn.active {
  background: var(--arv-primary) !important;
  border-color: var(--arv-primary) !important;
  color: #fff !important;
}

.arv-info-list li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.45rem 0;
  border-bottom: 1px dashed var(--arv-border);
  font-size: 0.92rem;
}

.arv-info-list li:last-child {
  border-bottom: none;
}

.arv-batch-thumb {
  height: 150px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.arv-batch-thumb img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.arv-alert-transparency {
  display: none;
}

.arv-alert-transparency.show {
  display: flex;
}

.arv-loading {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  display: none;
  align-items: center;
  justify-content: center;
  color: #fff;
  z-index: 2;
}

.arv-loading.show {
  display: flex;
}

.form-range::-webkit-slider-thumb {
  background: var(--arv-primary);
}

.nav-tabs .nav-link {
  color: var(--arv-muted);
  font-weight: 600;
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
}

.nav-tabs .nav-link.active {
  color: var(--arv-primary);
  background: transparent;
  border-bottom-color: var(--arv-primary);
}

.arv-footer {
  color: var(--arv-muted);
  font-size: 0.9rem;
  padding: 2rem 0 3rem;
}

.filter-none { filter: none; }
.filter-grayscale { filter: grayscale(100%); }
.filter-sepia { filter: sepia(100%); }
.filter-invert { filter: invert(80%); }
.filter-blur { filter: blur(2px); }
.filter-brightness { filter: brightness(1.5); }
.filter-contrast { filter: contrast(150%); }
.filter-hue { filter: hue-rotate(90deg); }

@media (max-width: 767.98px) {
  .arv-hero {
    padding-top: 2.5rem;
  }

  .arv-preview-frame {
    min-height: 240px;
  }
}

/* ---- Shared tool UI ---- */
.arv-stat {
  background: #fff;
  border: 1px solid var(--arv-border);
  border-radius: 0.85rem;
  padding: 1rem 1.1rem;
  height: 100%;
}
.arv-stat .arv-stat-value {
  font-size: 1.6rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--arv-primary);
}
.arv-stat .arv-stat-label {
  color: var(--arv-muted);
  font-size: 0.85rem;
  margin-top: 0.25rem;
}
.arv-stat.warn .arv-stat-value { color: #d97706; }
.arv-stat.danger .arv-stat-value { color: #dc2626; }
.arv-stat.ok .arv-stat-value { color: #16a34a; }
.arv-mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  direction: ltr;
  text-align: left;
}
.arv-color-swatch {
  width: 100%;
  height: 140px;
  border-radius: 0.85rem;
  border: 1px solid var(--arv-border);
}
.arv-seo-bar {
  height: 8px;
  border-radius: 999px;
  background: #e2e8f0;
  overflow: hidden;
}
.arv-seo-bar > span {
  display: block;
  height: 100%;
  border-radius: inherit;
  transition: width 0.2s ease, background 0.2s ease;
}
.arv-code-area {
  min-height: 320px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  direction: ltr;
  text-align: left;
  font-size: 0.9rem;
}
.arv-qr-box {
  width: 280px;
  max-width: 100%;
  margin: 0 auto;
  padding: 1rem;
  background: #fff;
  border-radius: 1rem;
  border: 1px solid var(--arv-border);
}
.arv-qr-box img, .arv-qr-box canvas {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}
.arv-file-chip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--arv-border);
  border-radius: 0.75rem;
  background: #fff;
}

.dropdown-menu-scroll {
  max-height: min(70vh, 480px);
  overflow-y: auto;
}