:root {
  --bg-top: #eaf3fc;
  --bg-bottom: #dce9f8;
  --card-bg: #ffffff;
  --border: #cfe0f3;
  --text: #33475b;
  --muted: #85a0bb;
  --accent: #a7c7ec;
  --accent-strong: #7fa8d9;
  --accent-contrast: #ffffff;
  --danger: #e6a4b4;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(160deg, var(--bg-top), var(--bg-bottom));
  color: var(--text);
}

.site-header {
  text-align: center;
  padding: 32px 16px 16px;
}

.site-header h1 {
  margin: 0 0 16px;
  font-size: 2.6rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
}

/* 로그인/회원가입 바 */
.auth-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.auth-bar-guest,
.auth-bar-user {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.auth-btn {
  border: 1px solid var(--accent);
  background: var(--card-bg);
  color: var(--accent-strong);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, transform 0.1s ease;
}

.auth-btn:hover {
  background: var(--accent);
  color: var(--accent-contrast);
}

.auth-btn:active {
  transform: scale(0.97);
}

.auth-btn-primary {
  background: var(--accent-strong);
  color: var(--accent-contrast);
  border-color: var(--accent-strong);
}

.auth-btn-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
}

.auth-user-name {
  font-weight: 600;
  color: var(--text);
}

.role-badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
  background: #fde9c8;
  color: #a4772c;
}

.role-badge[data-role="admin"] {
  background: #cdeedd;
  color: #2f8a5c;
}

.server-status {
  margin: 12px auto 0;
  max-width: 420px;
  font-size: 0.8rem;
  color: #b5657a;
  background: #fdeef1;
  border: 1px solid #f5cdd7;
  border-radius: 10px;
  padding: 8px 12px;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 16px;
}

/* 페이지 정렬/추가삭제 툴바 */
.page-toolbar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.sort-tabs {
  display: flex;
  gap: 4px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px;
}

.sort-tab {
  border: none;
  background: transparent;
  color: var(--muted);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.sort-tab:hover {
  color: var(--accent-strong);
}

.sort-tab.active {
  background: var(--accent-strong);
  color: var(--accent-contrast);
}

.page-actions {
  display: flex;
  gap: 8px;
}

/* 페이지 번호 선택 */
.page-picker {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.nav-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--accent);
  background: var(--card-bg);
  color: var(--accent-strong);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.nav-btn:hover:not(:disabled) {
  background: var(--accent);
  color: var(--accent-contrast);
}

.nav-btn:disabled {
  opacity: 0.35;
  cursor: default;
}

.page-numbers {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: center;
}

.page-number-btn {
  min-width: 34px;
  height: 34px;
  padding: 0 8px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.page-number-btn:hover {
  border-color: var(--accent-strong);
}

.page-number-btn.active {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: var(--accent-contrast);
}

/* 사진 그리드 (페이지당 자유 개수) */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}

.photo-tile {
  position: relative;
  aspect-ratio: 1 / 1;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(127, 168, 217, 0.12);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.photo-tile:hover {
  border-color: var(--accent-strong);
  box-shadow: 0 8px 22px rgba(127, 168, 217, 0.2);
}

.photo-tile img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.photo-tile.add-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--muted);
}

.photo-tile.empty-hint {
  cursor: default;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
  padding: 16px;
}

.plus {
  font-size: 2rem;
  line-height: 1;
  font-weight: 300;
}

.remove-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 50%;
  background: rgba(94, 128, 168, 0.65);
  color: #fff;
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.remove-btn:hover {
  background: rgba(94, 128, 168, 0.9);
}

/* 페이지 코멘트 */
.page-caption {
  display: block;
  width: 100%;
  min-height: 90px;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  font-family: inherit;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background: var(--card-bg);
}

.page-caption:focus {
  outline: none;
  border-color: var(--accent-strong);
}

.page-caption:disabled {
  background: transparent;
  border-color: transparent;
  resize: none;
  padding-left: 0;
  padding-right: 0;
  color: var(--text);
  opacity: 1;
}

.page-caption::placeholder {
  color: var(--muted);
}

/* 사진 크게보기 */
.lightbox-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(20, 28, 38, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}

.lightbox-img {
  max-width: 90vw;
  max-height: 85vh;
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.lightbox-close,
.lightbox-arrow {
  position: absolute;
  border: none;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease;
}

.lightbox-close:hover,
.lightbox-arrow:hover {
  background: rgba(255, 255, 255, 0.25);
}

.lightbox-close {
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 16px;
}

.lightbox-arrow {
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  font-size: 1.6rem;
}

.lightbox-prev {
  left: 16px;
}

.lightbox-next {
  right: 16px;
}

/* 모달 */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(51, 71, 91, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 100;
}

.modal {
  background: var(--card-bg);
  border-radius: 18px;
  padding: 28px;
  width: 100%;
  max-width: 340px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: 0 12px 32px rgba(51, 71, 91, 0.25);
}

.modal h2 {
  margin: 0;
  font-size: 1.2rem;
  color: var(--text);
}

.modal label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text);
}

.modal .hint {
  font-weight: 400;
  color: var(--muted);
  font-size: 0.75rem;
}

.modal input {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 9px 12px;
  font-size: 0.9rem;
  background: #f7fbff;
  color: var(--text);
}

.modal input:focus {
  outline: none;
  border-color: var(--accent-strong);
}

.modal-error {
  margin: 0;
  font-size: 0.8rem;
  color: #c1546b;
  background: #fdeef1;
  border-radius: 8px;
  padding: 6px 10px;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 4px;
}

@media (max-width: 600px) {
  .photo-grid {
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 8px;
  }

  .lightbox-arrow {
    width: 40px;
    height: 40px;
    font-size: 1.3rem;
  }
}