/* 이미지 벡터 변환기 전용 스타일
   테마: 바이올렛 계열 — 디자인/편집 도구 느낌을 살리면서 기존 스카이블루(이미지 변환기)와
   겹치지 않게 골랐습니다. */

:root {
  --vc-primary: #7c3aed;
  --vc-primary-dark: #6d28d9;
  --vc-bg: #faf8fd;
  --vc-card-bg: #ffffff;
  --vc-border: #e4d9f7;
  --vc-text: #1e1b2e;
  --vc-text-muted: #6b6478;
  --vc-danger: #dc2626;
  --vc-warning: #b45309;
  --vc-radius: 12px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  background: var(--vc-bg);
  color: var(--vc-text);
  line-height: 1.6;
}

.top-bar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  height: 56px;
  padding: 0 16px;
  background: var(--vc-bg);
}

/* PC처럼 넓은 화면에서는 스크롤을 올렸을 때 상단바 전체가 화면을 가리지 않도록,
   막대(.top-bar) 자체를 폭 전체가 아니라 버튼 크기만큼만 남기고 배경도 지웁니다.
   .back-link 자체가 이미 불투명한 배경(pill 버튼)을 갖고 있어서 겹침 문제 없이
   버튼만 떠 있는 것처럼 보입니다. */
@media (min-width: 768px) {
  .top-bar {
    width: fit-content;
    height: auto;
    padding: 12px 16px 0;
    background: transparent;
  }
}

.back-link {
  display: inline-block;
  padding: 6px 14px;
  background: var(--vc-card-bg);
  border: 1px solid var(--vc-border);
  border-radius: 999px;
  color: var(--vc-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.06);
}

.back-link:hover {
  color: var(--vc-primary);
}

.page-header {
  text-align: center;
  padding: 10px 16px 16px;
}

.page-header h1 {
  margin: 0 0 8px;
  font-family: "Encode Sans Expanded", -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 800;
  font-size: 2.2rem;
  letter-spacing: -0.01em;
  color: var(--vc-primary-dark);
}

.subtitle {
  margin: 0;
  color: var(--vc-text-muted);
  font-size: 1.1rem;
}

.tagline-extra {
  margin: 6px 0 0;
  color: var(--vc-text-muted);
  font-size: 0.9rem;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 16px 48px;
}

.vc-card {
  margin-top: 20px;
  background: var(--vc-card-bg);
  border: 1px solid var(--vc-border);
  border-radius: var(--vc-radius);
  padding: 20px;
  box-shadow: 0 1px 8px rgba(30, 27, 46, 0.04);
}

.vc-dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 6px;
  padding: 40px 20px;
  border: 2px dashed var(--vc-border);
  border-radius: var(--vc-radius);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.vc-dropzone:hover,
.vc-dropzone:focus-visible {
  border-color: var(--vc-primary);
  background: rgba(124, 58, 237, 0.05);
  outline: none;
}

.vc-dropzone.vc-dropzone-active {
  border-color: var(--vc-primary);
  background: rgba(124, 58, 237, 0.08);
}

.vc-dropzone-icon {
  color: var(--vc-primary);
  margin-bottom: 4px;
}

.vc-dropzone-text {
  margin: 0;
  font-weight: 600;
  color: var(--vc-text);
}

.vc-dropzone-hint {
  margin: 0 0 8px;
  font-size: 0.85rem;
  color: var(--vc-text-muted);
}

.vc-choose-btn {
  padding: 9px 20px;
  border: none;
  border-radius: 999px;
  background: var(--vc-primary);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.12s ease;
}

.vc-choose-btn:hover {
  background: var(--vc-primary-dark);
}

.vc-error {
  margin: 12px 0 0;
  padding: 10px 14px;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 8px;
  color: var(--vc-danger);
  font-size: 0.88rem;
}

.vc-error[hidden] {
  display: none;
}

.vc-warning {
  margin: 12px 0 0;
  padding: 10px 14px;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 8px;
  color: var(--vc-warning);
  font-size: 0.85rem;
}

.vc-warning[hidden] {
  display: none;
}

.vc-workspace {
  margin-top: 20px;
  background: var(--vc-card-bg);
  border: 1px solid var(--vc-border);
  border-radius: var(--vc-radius);
  padding: 20px;
  box-shadow: 0 1px 8px rgba(30, 27, 46, 0.04);
}

.vc-workspace[hidden] {
  display: none;
}

.vc-preview-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 20px;
}

.vc-preview-box {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.vc-preview-frame {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 160px;
  background:
    linear-gradient(45deg, #f1eafb 25%, transparent 25%),
    linear-gradient(-45deg, #f1eafb 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #f1eafb 75%),
    linear-gradient(-45deg, transparent 75%, #f1eafb 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
  border: 1px solid var(--vc-border);
  border-radius: 10px;
  overflow: hidden;
}

.vc-preview-frame img,
.vc-preview-frame svg {
  max-width: 100%;
  max-height: 260px;
  object-fit: contain;
}

.vc-preview-box figcaption {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 0.8rem;
}

.vc-preview-label {
  font-weight: 700;
  color: var(--vc-primary-dark);
}

.vc-preview-meta {
  color: var(--vc-text-muted);
}

.vc-preview-box[hidden] {
  display: none;
}

.vc-spinner {
  width: 28px;
  height: 28px;
  border: 3px solid var(--vc-border);
  border-top-color: var(--vc-primary);
  border-radius: 50%;
  animation: vc-spin 0.7s linear infinite;
}

@keyframes vc-spin {
  to {
    transform: rotate(360deg);
  }
}

.vc-advanced {
  margin-top: 18px;
  border-top: 1px solid var(--vc-border);
  padding-top: 12px;
}

.vc-advanced-label {
  margin: 0;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--vc-primary-dark);
}

.vc-detail-value {
  display: inline-block;
  min-width: 1.6em;
  padding: 1px 6px;
  border-radius: 999px;
  background: rgba(124, 58, 237, 0.12);
  color: var(--vc-primary-dark);
  font-weight: 700;
  font-size: 0.78rem;
  text-align: center;
}

.vc-advanced-body {
  margin-top: 12px;
}

.vc-advanced-body input[type="range"] {
  width: 100%;
  accent-color: var(--vc-primary);
}

.vc-detail-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.76rem;
  color: var(--vc-text-muted);
  margin-top: 2px;
}

.vc-advanced-hint {
  margin: 8px 0 0;
  font-size: 0.78rem;
  color: var(--vc-text-muted);
}

.vc-result-actions {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.vc-result-actions[hidden] {
  display: none;
}

.vc-download-btn {
  padding: 10px 22px;
  border: none;
  border-radius: 999px;
  background: #16a34a;
  color: #fff;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}

.vc-download-btn:hover {
  background: #15803d;
}

.vc-secondary-btn {
  padding: 10px 18px;
  border: 1px solid var(--vc-border);
  border-radius: 999px;
  background: var(--vc-card-bg);
  color: var(--vc-text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

.vc-secondary-btn:hover {
  border-color: var(--vc-primary);
  color: var(--vc-primary-dark);
}

.ads-container {
  margin: 40px 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--vc-card-bg);
  border: 1px solid var(--vc-border);
  border-radius: var(--vc-radius);
  color: var(--vc-text-muted);
  font-size: 0.85rem;
}

.ads-rail {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  width: 160px;
  margin: 0;
  display: none;
  z-index: 5;
}

.ads-rail-left {
  left: 16px;
}

.ads-rail-right {
  right: 16px;
}

@media (min-width: 932px) {
  .ads-rail {
    display: flex;
  }
}

.info-section {
  margin-top: 24px;
}

.info-section h2 {
  color: var(--vc-primary-dark);
  font-size: 1.35rem;
  margin-top: 32px;
}

.faq-list .faq-item {
  margin-bottom: 16px;
}

.faq-list dt {
  font-weight: 600;
  color: var(--vc-text);
  margin-bottom: 4px;
}

.faq-list dd {
  margin: 0;
  color: var(--vc-text-muted);
}

.footer-links {
  margin: 8px 0 0;
}

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

.footer-links a:hover {
  color: var(--vc-primary);
}

.page-footer {
  text-align: center;
  padding: 24px 16px 40px;
  color: var(--vc-text-muted);
  font-size: 0.85rem;
}

.scroll-top-btn {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 20;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--vc-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 2px 10px rgba(124, 58, 237, 0.35);
  transition: background 0.12s ease, transform 0.12s ease;
}

.scroll-top-btn:hover {
  background: var(--vc-primary-dark);
  transform: translateY(-2px);
}

.scroll-top-btn[hidden] {
  display: none;
}

@media (max-width: 560px) {
  .page-header h1 {
    font-size: 1.7rem;
  }

  .vc-dropzone {
    padding: 28px 14px;
  }

  .vc-preview-row {
    grid-template-columns: 1fr;
  }
}