* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #ffffff;
  --bg-secondary: #f7f7f6;
  --text: #1a1a1a;
  --text-secondary: #6b6b6b;
  --text-tertiary: #a8a8a8;
  --border: rgba(0,0,0,0.1);
  --border-md: rgba(0,0,0,0.18);
  --radius-md: 8px;
  --radius-lg: 12px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
}

.hidden { display: none !important; }

/* 로그인 */
.login-screen {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
}
.login-wrap { display: flex; flex-direction: column; align-items: center; gap: 0; }
.login-hero { display: flex; align-items: center; gap: 18px; margin-bottom: 36px; }
.hero-icon {
  width: 64px; height: 64px;
  border: 0.5px solid var(--border);
  border-radius: var(--radius-lg);
  display: flex; align-items: center; justify-content: center;
  font-size: 26px; color: var(--text-tertiary);
  background: var(--bg-secondary);
}
.login-title { font-size: 20px; font-weight: 500; letter-spacing: 0.08em; }
.login-sub { font-size: 13px; color: var(--text-tertiary); margin-top: 4px; }
.login-form { width: 280px; display: flex; flex-direction: column; gap: 10px; }
.login-form input {
  font-size: 13px; padding: 10px 12px;
  border: 0.5px solid var(--border-md);
  border-radius: var(--radius-md);
  background: var(--bg); color: var(--text);
  outline: none; font-family: inherit;
}
.login-form input:focus { border-color: var(--text); }
.login-error { font-size: 12px; color: #c0392b; min-height: 16px; }
.login-btn {
  font-size: 13px; padding: 10px;
  border: none; border-radius: var(--radius-md);
  background: var(--text); color: var(--bg);
  cursor: pointer; font-weight: 500; margin-top: 4px;
  font-family: inherit;
}

/* 앱 레이아웃 */
.main-app { height: 100vh; display: flex; flex-direction: column; }

.header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px 12px;
  border-bottom: 0.5px solid var(--border);
  flex-shrink: 0; z-index: 100;
  background: var(--bg);
}
.header-left { display: flex; align-items: center; gap: 12px; }
.menu-btn { cursor: pointer; display: flex; flex-direction: column; gap: 4px; padding: 4px; }
.bar { width: 18px; height: 1.5px; background: var(--text); border-radius: 2px; }
.logo { font-size: 13px; font-weight: 500; letter-spacing: 0.08em; cursor: pointer; color: var(--text); }
.header-right { display: flex; align-items: center; gap: 10px; }
.notif-btn { position: relative; cursor: pointer; }
.notif-btn i { font-size: 17px; color: var(--text-secondary); }
.notif-dot {
  position: absolute; top: -2px; right: -2px;
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--text); border: 1.5px solid var(--bg);
}
.avatar-sm {
  width: 26px; height: 26px; border-radius: 50%;
  border: 0.5px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 10px; font-weight: 500; color: var(--text-secondary);
}

.body { display: flex; flex: 1; min-height: 0; }

/* 사이드바 */
.sidebar {
  width: 156px; flex-shrink: 0;
  border-right: 0.5px solid var(--border);
  padding: 16px 0;
  overflow: hidden;
  transition: width 0.2s;
}
.sidebar.hidden { width: 0; padding: 0; }
.menu-item {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 16px; font-size: 12px;
  color: var(--text-secondary); cursor: pointer;
  border-left: 2px solid transparent;
  white-space: nowrap;
}
.menu-item:hover { color: var(--text); background: var(--bg-secondary); }
.menu-item.active { color: var(--text); font-weight: 500; border-left-color: var(--text); background: var(--bg-secondary); }
.menu-item i { font-size: 14px; flex-shrink: 0; }

/* 콘텐츠 */
.content { flex: 1; overflow-y: auto; min-width: 0; }
.page { display: none; }
.page.active { display: block; }

.page-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 20px 16px;
}
.page-title { font-size: 15px; font-weight: 500; padding: 20px 20px 16px; }
.page-header .page-title { padding: 0; }

.add-btn {
  display: flex; align-items: center; gap: 6px;
  font-size: 12px; padding: 6px 12px;
  border: 0.5px solid var(--border-md);
  border-radius: var(--radius-md);
  background: transparent; color: var(--text-secondary);
  cursor: pointer; font-family: inherit;
}
.add-btn:hover { color: var(--text); }

/* 홈 */
.home-hero {
  display: flex; align-items: stretch;
  border-bottom: 0.5px solid var(--border);
  position: relative; overflow: hidden;
}
.home-text-side {
  width: 200px; flex-shrink: 0;
  padding: 32px 24px;
  display: flex; flex-direction: column; justify-content: center;
  border-right: 0.5px solid var(--border);
  background: var(--bg); z-index: 2;
}
.home-title { font-size: 28px; font-weight: 500; letter-spacing: 0.06em; line-height: 1.2; margin-bottom: 12px; }
.home-dday { font-size: 12px; color: var(--text-secondary); }
.home-dday span { font-weight: 500; color: var(--text); }
.photo-area {
  flex: 1; position: relative; overflow: hidden;
  min-height: 200px; cursor: pointer;
  background: var(--bg-secondary);
}
.parallax-img {
  width: 100%; object-fit: cover;
  position: absolute; top: 0; left: 0;
  will-change: transform; display: none;
}
.photo-placeholder {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 8px;
}
.photo-placeholder i { font-size: 26px; color: var(--text-tertiary); }
.photo-placeholder span { font-size: 11px; color: var(--text-tertiary); }
.photo-edit-hint {
  position: absolute; bottom: 10px; right: 10px;
  font-size: 11px; color: var(--text-tertiary);
  background: var(--bg); border: 0.5px solid var(--border);
  border-radius: var(--radius-md); padding: 4px 10px;
  opacity: 0; transition: opacity 0.15s; z-index: 3;
  pointer-events: none;
}
.photo-area:hover .photo-edit-hint { opacity: 1; }

.home-recent { padding: 22px 24px; }
.section-label { font-size: 10px; color: var(--text-tertiary); letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 10px; }
.recent-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin-bottom: 16px; }
.recent-thumb {
  aspect-ratio: 1; background: var(--bg-secondary);
  border: 0.5px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  overflow: hidden; cursor: pointer;
}
.recent-thumb.empty i { font-size: 16px; color: var(--text-tertiary); }
.recent-thumb img { width: 100%; height: 100%; object-fit: cover; }
.recent-entry {
  padding: 10px 0; border-bottom: 0.5px solid var(--border);
  display: flex; justify-content: space-between; align-items: baseline;
  font-size: 13px; color: var(--text-secondary); cursor: pointer;
}
.recent-entry:hover { color: var(--text); }
.recent-entry-date { font-size: 11px; color: var(--text-tertiary); flex-shrink: 0; margin-left: 12px; }
.recent-entry-text { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* 캘린더 */
.cal-nav {
  display: flex; align-items: center; gap: 10px;
  padding: 0 20px 12px;
}
.cal-month { font-size: 13px; font-weight: 500; }
.cal-arrow { cursor: pointer; color: var(--text-secondary); padding: 2px 4px; font-size: 15px; }
.cal-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 2px; padding: 0 20px; }
.cal-header { font-size: 11px; color: var(--text-tertiary); text-align: center; padding: 4px 0; }
.cal-day {
  aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
  font-size: 12px; color: var(--text-secondary);
  cursor: pointer; border-radius: var(--radius-md); position: relative;
}
.cal-day:hover { background: var(--bg-secondary); }
.cal-day.has-record::after {
  content: ''; width: 4px; height: 4px; border-radius: 50%;
  background: var(--text); position: absolute; bottom: 2px;
  left: 50%; transform: translateX(-50%);
}
.cal-day.selected { background: var(--text); color: var(--bg); }
.cal-day.selected::after { background: var(--bg); }
.cal-day.today { font-weight: 500; color: var(--text); }

/* 날짜 상세 */
.day-detail { margin: 16px 20px; border: 0.5px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; }
.day-detail-header {
  padding: 12px 14px; border-bottom: 0.5px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
}
.day-detail-title { font-size: 13px; font-weight: 500; }
.day-photos { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--border); }
.day-photo {
  aspect-ratio: 4/3; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-secondary); cursor: pointer;
}
.day-photo img { width: 100%; height: 100%; object-fit: cover; }
.day-photo i { font-size: 22px; color: var(--text-tertiary); }
.day-diary { padding: 12px 14px; font-size: 13px; color: var(--text-secondary); line-height: 1.7; border-bottom: 0.5px solid var(--border); }
.day-reactions { padding: 8px 14px; display: flex; gap: 8px; border-bottom: 0.5px solid var(--border); }
.reaction-btn {
  display: flex; align-items: center; gap: 4px;
  font-size: 12px; color: var(--text-secondary);
  cursor: pointer; padding: 3px 10px;
  border: 0.5px solid var(--border); border-radius: 20px;
}
.reaction-btn.active { color: var(--text); border-color: var(--border-md); font-weight: 500; }
.day-comments { padding: 10px 14px; }
.comment-row { display: flex; gap: 8px; margin-bottom: 8px; align-items: flex-start; }
.comment-avatar {
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--bg-secondary); border: 0.5px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 10px; font-weight: 500; color: var(--text-secondary); flex-shrink: 0;
}
.comment-meta { font-size: 10px; color: var(--text-tertiary); margin-bottom: 1px; }
.comment-text { font-size: 12px; line-height: 1.5; }
.comment-input-row {
  display: flex; gap: 8px; align-items: center;
  margin-top: 8px; padding-top: 8px; border-top: 0.5px solid var(--border);
}
.comment-input {
  flex: 1; font-size: 12px; border: none;
  background: transparent; color: var(--text);
  outline: none; font-family: inherit;
}
.comment-send {
  font-size: 11px; color: var(--text-secondary); cursor: pointer;
  padding: 3px 8px; border: 0.5px solid var(--border);
  border-radius: var(--radius-md); background: transparent; font-family: inherit;
}

/* 게시판 */
.board-list { padding: 0 20px; }
.board-item {
  border-bottom: 0.5px solid var(--border);
  padding: 12px 0; cursor: pointer;
}
.board-item:hover .board-item-title { color: var(--text-secondary); }
.board-notice { background: var(--bg-secondary); padding: 10px 12px; border-radius: var(--radius-md); margin-bottom: 2px; }
.notice-badge {
  font-size: 10px; padding: 2px 7px; border-radius: 10px;
  border: 0.5px solid var(--border-md); color: var(--text-secondary);
  margin-right: 8px;
}
.board-item-title { font-size: 13px; font-weight: 500; margin-bottom: 3px; }
.board-item-meta { font-size: 11px; color: var(--text-tertiary); display: flex; gap: 10px; }

/* 연표 */
.tl-wrap { padding: 4px 20px 20px 40px; position: relative; }
.tl-line { position: absolute; left: 28px; top: 0; bottom: 0; width: 0.5px; background: var(--border); }
.tl-item { position: relative; margin-bottom: 22px; }
.tl-dot {
  position: absolute; left: -18px; top: 4px;
  width: 8px; height: 8px; border-radius: 50%;
  border: 1.5px solid var(--text); background: var(--bg);
}
.tl-date { font-size: 11px; color: var(--text-tertiary); margin-bottom: 2px; }
.tl-title { font-size: 13px; font-weight: 500; }
.tl-desc { font-size: 12px; color: var(--text-secondary); margin-top: 2px; }

.future-list { padding: 0 20px; }
.future-item {
  border: 0.5px dashed var(--border-md);
  border-radius: var(--radius-md);
  padding: 10px 14px; margin-bottom: 8px;
  display: flex; gap: 14px; align-items: center;
}
.future-date { font-size: 11px; color: var(--text-tertiary); min-width: 58px; }
.future-text { font-size: 13px; color: var(--text-secondary); }

/* 떠도는 생각들 */
.thoughts-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 20px 12px;
}
.thoughts-month { font-size: 14px; font-weight: 500; }
.thoughts-canvas {
  margin: 0 20px;
  min-height: 260px; border: 0.5px solid var(--border);
  border-radius: var(--radius-lg); padding: 18px;
  position: relative; overflow: hidden;
}
.thought-tag {
  position: absolute; font-size: 12px; color: var(--text-secondary);
  cursor: default; user-select: none;
  animation: fadeIn 0.3s ease;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.thoughts-input {
  display: flex; gap: 8px; margin: 10px 20px 0;
}
.thoughts-input input {
  flex: 1; font-size: 13px;
  border: 0.5px solid var(--border);
  border-radius: var(--radius-md); padding: 8px 12px;
  background: var(--bg); color: var(--text);
  outline: none; font-family: inherit;
}
.thoughts-input button {
  font-size: 12px; padding: 8px 14px;
  border: 0.5px solid var(--border);
  border-radius: var(--radius-md);
  background: transparent; color: var(--text-secondary);
  cursor: pointer; font-family: inherit;
}

/* 편지 */
.letter-tabs {
  display: flex; border-bottom: 0.5px solid var(--border); padding: 0 20px;
}
.letter-tab {
  font-size: 13px; padding: 12px 0; margin-right: 18px;
  color: var(--text-secondary); cursor: pointer;
  border-bottom: 1.5px solid transparent; margin-bottom: -0.5px;
}
.letter-tab.active { color: var(--text); font-weight: 500; border-bottom-color: var(--text); }
.letter-body-pad { padding: 18px 20px; }
.letter-list { display: flex; flex-direction: column; gap: 8px; }
.letter-card {
  border: 0.5px solid var(--border); border-radius: var(--radius-lg);
  padding: 14px; cursor: pointer;
}
.letter-card:hover { background: var(--bg-secondary); }
.letter-meta {
  font-size: 11px; color: var(--text-tertiary); margin-bottom: 5px;
  display: flex; justify-content: space-between; align-items: center;
}
.letter-preview { font-size: 13px; color: var(--text-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.unread-badge {
  font-size: 10px; background: var(--text); color: var(--bg);
  padding: 2px 7px; border-radius: 10px;
}
.letter-compose-wrap { border: 0.5px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; }
.letter-paper { background: var(--bg); padding: 24px 24px 16px; }
.letter-salutation { font-size: 13px; color: var(--text-secondary); margin-bottom: 14px; font-style: italic; }
.letter-paper textarea {
  width: 100%; font-size: 13px; border: none;
  background: transparent; color: var(--text);
  outline: none; resize: none; height: 200px;
  font-family: inherit; line-height: 1.9;
}
.letter-footer {
  border-top: 0.5px solid var(--border); padding: 10px 14px;
  display: flex; justify-content: space-between; align-items: center;
  background: var(--bg-secondary);
}
.letter-to { font-size: 11px; color: var(--text-tertiary); }
.send-btn {
  font-size: 12px; padding: 6px 16px;
  border: 0.5px solid var(--border-md);
  border-radius: var(--radius-md); background: var(--bg);
  color: var(--text); cursor: pointer;
  display: flex; align-items: center; gap: 6px; font-family: inherit;
}

/* 알림 */
.notif-list { padding: 0 20px; }
.notif-item {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 12px 0; border-bottom: 0.5px solid var(--border); cursor: pointer;
}
.notif-icon {
  width: 30px; height: 30px; border-radius: 50%;
  background: var(--bg-secondary); border: 0.5px solid var(--border);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
  font-size: 14px; color: var(--text-secondary);
}
.notif-text { font-size: 13px; font-weight: 500; line-height: 1.5; }
.notif-time { font-size: 11px; color: var(--text-tertiary); margin-top: 2px; }
.notif-read .notif-text { font-weight: 400; color: var(--text-secondary); }

/* 모달 */
.modal-bg {
  position: fixed; inset: 0; background: rgba(0,0,0,0.4);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000;
}
.modal {
  background: var(--bg); border-radius: var(--radius-lg);
  padding: 24px; width: 340px; max-width: 90vw;
  border: 0.5px solid var(--border);
  max-height: 80vh; overflow-y: auto;
}
.modal-title { font-size: 15px; font-weight: 500; margin-bottom: 16px; }
.modal label {
  font-size: 12px; color: var(--text-secondary);
  display: block; margin-bottom: 4px; margin-top: 12px;
}
.modal input[type="text"], .modal input[type="date"], .modal input[type="file"], .modal textarea {
  width: 100%; font-size: 13px;
  border: 0.5px solid var(--border-md);
  border-radius: var(--radius-md); padding: 8px 10px;
  background: var(--bg-secondary); color: var(--text);
  outline: none; font-family: inherit;
}
.modal textarea { resize: none; height: 90px; }
.modal input[type="file"] { padding: 6px 10px; }
.modal-check { display: flex; align-items: center; gap: 8px; margin-top: 14px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 18px; }
.btn-cancel {
  font-size: 13px; padding: 7px 14px;
  border: 0.5px solid var(--border); border-radius: var(--radius-md);
  background: transparent; color: var(--text-secondary); cursor: pointer; font-family: inherit;
}
.btn-save {
  font-size: 13px; padding: 7px 14px;
  border: none; border-radius: var(--radius-md);
  background: var(--text); color: var(--bg);
  cursor: pointer; font-family: inherit;
}

/* 스크롤바 */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-md); border-radius: 2px; }