/* 이미지 변환기 전용 스타일
   테마: 스카이블루 계열 — 파일 업로드/편집형 도구답게 밝고 가벼운 톤으로,
   기존에 쓰인 청록(QR)·남색(비밀번호)·핑크(그라데이션)와 겹치지 않게 골랐습니다. */

:root {
  --ic-primary: #0ea5e9;
  --ic-primary-dark: #0284c7;
  --ic-bg: #f7f9fb;
  --ic-card-bg: #ffffff;
  --ic-border: #d7e6ef;
  --ic-text: #1e293b;
  --ic-text-muted: #64748b;
  --ic-danger: #dc2626;
  --ic-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(--ic-bg);
  color: var(--ic-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(--ic-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(--ic-card-bg);
  border: 1px solid var(--ic-border);
  border-radius: 999px;
  color: var(--ic-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(--ic-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(--ic-primary-dark);
}

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

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

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 16px 48px;
}

.ic-card {
  margin-top: 20px;
  background: var(--ic-card-bg);
  border: 1px solid var(--ic-border);
  border-radius: var(--ic-radius);
  padding: 20px;
  box-shadow: 0 1px 8px rgba(15, 23, 42, 0.04);
}

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

.ic-dropzone:hover,
.ic-dropzone:focus-visible {
  border-color: var(--ic-primary);
  background: rgba(14, 165, 233, 0.05);
  outline: none;
}

.ic-dropzone.ic-dropzone-active {
  border-color: var(--ic-primary);
  background: rgba(14, 165, 233, 0.08);
}

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

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

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

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

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

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

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

.ic-file-list-section {
  margin-top: 20px;
}

.ic-file-list-section[hidden] {
  display: none;
}

.ic-file-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.ic-file-count {
  font-size: 0.9rem;
  color: var(--ic-text-muted);
}

.ic-clear-all-btn {
  padding: 6px 14px;
  border: 1px solid var(--ic-border);
  border-radius: 999px;
  background: var(--ic-card-bg);
  color: var(--ic-text-muted);
  font-size: 0.82rem;
  cursor: pointer;
}

.ic-clear-all-btn:hover {
  border-color: var(--ic-danger);
  color: var(--ic-danger);
}

.ic-settings {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 16px;
  padding: 14px 16px;
  background: #f0f9ff;
  border: 1px solid var(--ic-border);
  border-radius: var(--ic-radius);
}

.ic-setting {
  flex: 1;
  min-width: 180px;
}

.ic-setting label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ic-text);
}

.ic-setting-value {
  color: var(--ic-primary-dark);
  font-weight: 700;
}

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

.ic-setting-hint {
  margin: 4px 0 0;
  font-size: 0.76rem;
  color: var(--ic-text-muted);
}

.ic-file-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.ic-file-card {
  background: var(--ic-card-bg);
  border: 1px solid var(--ic-border);
  border-radius: var(--ic-radius);
  padding: 14px 16px;
}

.ic-file-info {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.ic-file-name {
  font-weight: 600;
  font-size: 0.92rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

.ic-file-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.ic-format-btn {
  padding: 7px 14px;
  border: 1px solid var(--ic-border);
  border-radius: 999px;
  background: var(--ic-card-bg);
  color: var(--ic-text);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease, color 0.12s ease;
}

.ic-format-btn:hover:not(:disabled) {
  border-color: var(--ic-primary);
  color: var(--ic-primary-dark);
}

.ic-format-btn[aria-pressed="true"] {
  background: var(--ic-primary);
  border-color: var(--ic-primary);
  color: #fff;
}

.ic-format-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.ic-remove-btn {
  margin-left: auto;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--ic-text-muted);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
}

.ic-remove-btn:hover {
  background: #fef2f2;
  color: var(--ic-danger);
}

.ic-file-status {
  margin-top: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
}

.ic-file-status[hidden] {
  display: none;
}

.ic-file-status-text {
  color: var(--ic-text-muted);
}

.ic-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--ic-border);
  border-top-color: var(--ic-primary);
  border-radius: 50%;
  animation: ic-spin 0.7s linear infinite;
  flex-shrink: 0;
}

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

.ic-file-status.ic-status-error .ic-file-status-text {
  color: var(--ic-danger);
}

.ic-save-btn {
  padding: 7px 16px;
  border: none;
  border-radius: 999px;
  background: #16a34a;
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

.ic-save-btn:hover {
  background: #15803d;
}

.ads-container {
  margin: 40px 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--ic-card-bg);
  border: 1px solid var(--ic-border);
  border-radius: var(--ic-radius);
  color: var(--ic-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(--ic-primary-dark);
  font-size: 1.35rem;
  margin-top: 32px;
}

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

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

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

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

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

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

.page-footer {
  text-align: center;
  padding: 24px 16px 40px;
  color: var(--ic-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(--ic-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 2px 10px rgba(14, 165, 233, 0.35);
  transition: background 0.12s ease, transform 0.12s ease;
}

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

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

@media (max-width: 480px) {
  .page-header h1 {
    font-size: 1.7rem;
  }

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

  .ic-file-info {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
  }
}