/* ============================================================
   퇴계중 1-1반 소통플랫폼 - Main Stylesheet
   중학생 친화적 밝은 색상 + 모바일 반응형
   ============================================================ */

/* ---------- CSS 변수 ---------- */
:root {
  /* 주색상 팔레트 */
  --primary:        #6C63FF;
  --primary-light:  #8B85FF;
  --primary-dark:   #4D47CC;
  --primary-bg:     #F0EFFF;

  --secondary:      #FF6584;
  --secondary-light:#FF8FA3;
  --secondary-bg:   #FFF0F3;

  --accent-green:   #43D9AD;
  --accent-yellow:  #FFD166;
  --accent-blue:    #4FC3F7;
  --accent-orange:  #FF9A3C;

  /* 페이지별 테마 */
  --chat-color:     #6C63FF;
  --birthday-color: #FF6584;
  --study-color:    #43D9AD;
  --umbrella-color: #4FC3F7;

  /* 중립 색상 */
  --gray-50:   #F8F9FE;
  --gray-100:  #F0F2F8;
  --gray-200:  #E2E6F0;
  --gray-300:  #CBD1E0;
  --gray-400:  #9AA3BC;
  --gray-500:  #6B7498;
  --gray-600:  #4A5270;
  --gray-700:  #2D3352;
  --gray-800:  #1A1E36;

  /* 텍스트 */
  --text-primary:   #2D3352;
  --text-secondary: #6B7498;
  --text-muted:     #9AA3BC;

  /* 배경 */
  --bg-main:    #F4F6FE;
  --bg-card:    #FFFFFF;
  --bg-sidebar: #1E2140;

  /* 사이드바 */
  --sidebar-width: 260px;
  --header-height: 64px;
  --bottom-nav-height: 64px;

  /* 반경·그림자 */
  --radius-sm:  8px;
  --radius-md:  12px;
  --radius-lg:  16px;
  --radius-xl:  24px;
  --radius-full: 999px;

  --shadow-sm:  0 1px 4px rgba(44,51,96,.08);
  --shadow-md:  0 4px 16px rgba(44,51,96,.12);
  --shadow-lg:  0 8px 32px rgba(44,51,96,.16);
  --shadow-xl:  0 16px 48px rgba(44,51,96,.20);

  /* 전환 */
  --transition: .2s ease;
  --transition-slow: .35s ease;

  /* 폰트 */
  --font-main:  'Noto Sans KR', sans-serif;
  --font-title: 'Nunito', 'Noto Sans KR', sans-serif;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  background: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

/* ---------- Utilities ---------- */
.hidden { display: none !important; }
.mt-2  { margin-top: .5rem; }
.mt-4  { margin-top: 1rem; }
.text-muted { color: var(--text-muted); }
.required { color: var(--secondary); }

/* ============================================================
   LAYOUT
   ============================================================ */
.layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  margin-left: var(--sidebar-width);
  transition: margin-left var(--transition-slow);
}

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--bg-card);
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  box-shadow: var(--shadow-sm);
}
.header__left { display: flex; align-items: center; gap: .75rem; }
.header__menu-btn {
  display: none;
  width: 40px; height: 40px;
  border-radius: var(--radius-sm);
  background: var(--gray-100);
  color: var(--gray-600);
  font-size: 1.1rem;
  align-items: center; justify-content: center;
  transition: background var(--transition);
}
.header__menu-btn:hover { background: var(--primary-bg); color: var(--primary); }
.header__title {
  font-family: var(--font-title);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}
.header__right { display: flex; align-items: center; gap: .75rem; }
.header__date {
  font-size: .8rem;
  color: var(--text-muted);
  font-weight: 500;
}
.header__admin-badge {
  display: flex;
  align-items: center;
  gap: .3rem;
  background: linear-gradient(135deg, #FF6584, #FF9A3C);
  color: #fff;
  font-size: .75rem;
  font-weight: 700;
  padding: .25rem .7rem;
  border-radius: var(--radius-full);
}

.main-content {
  flex: 1;
  padding: 1.5rem;
  padding-bottom: 1.5rem;
}

/* ============================================================
   SIDEBAR
   ============================================================ */
.sidebar {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-sidebar);
  display: flex;
  flex-direction: column;
  z-index: 200;
  transition: transform var(--transition-slow);
  overflow-y: auto;
}
.sidebar-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 190;
}

.sidebar__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.25rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.sidebar__logo { display: flex; align-items: center; gap: .75rem; }
.sidebar__logo-icon { font-size: 2rem; line-height: 1; }
.sidebar__logo-title {
  font-family: var(--font-title);
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
}
.sidebar__logo-sub {
  font-size: .72rem;
  color: rgba(255,255,255,.5);
  font-weight: 400;
}
.sidebar__close-btn {
  display: none;
  width: 32px; height: 32px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,.1);
  color: rgba(255,255,255,.7);
  align-items: center; justify-content: center;
  font-size: .9rem;
}

.sidebar__nav {
  flex: 1;
  padding: 1rem .75rem;
  display: flex;
  flex-direction: column;
  gap: .25rem;
}
.sidebar__nav-item {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .75rem 1rem;
  border-radius: var(--radius-md);
  color: rgba(255,255,255,.65);
  font-size: .9rem;
  font-weight: 500;
  transition: all var(--transition);
  position: relative;
}
.sidebar__nav-item:hover {
  background: rgba(255,255,255,.08);
  color: #fff;
}
.sidebar__nav-item.active {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  box-shadow: 0 4px 12px rgba(108,99,255,.4);
}
.sidebar__nav-icon {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.sidebar__nav-text { flex: 1; }
.sidebar__nav-badge {
  background: var(--secondary);
  color: #fff;
  font-size: .65rem;
  font-weight: 700;
  padding: .15rem .45rem;
  border-radius: var(--radius-full);
  min-width: 20px;
  text-align: center;
}
.sidebar__nav-badge[data-count="0"] { display: none; }

.sidebar__footer {
  padding: 1rem .75rem 1.5rem;
  border-top: 1px solid rgba(255,255,255,.08);
}
.sidebar__admin-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .7rem 1rem;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,.07);
  color: rgba(255,255,255,.7);
  font-size: .85rem;
  font-weight: 600;
  transition: all var(--transition);
}
.sidebar__admin-btn:hover {
  background: rgba(255,102,132,.2);
  color: var(--secondary-light);
}
.sidebar__admin-btn.active {
  background: rgba(255,102,132,.25);
  color: var(--secondary-light);
}

/* ============================================================
   BOTTOM NAV (모바일)
   ============================================================ */
.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: var(--bottom-nav-height);
  background: var(--bg-card);
  border-top: 1px solid var(--gray-200);
  z-index: 100;
  box-shadow: 0 -4px 16px rgba(44,51,96,.08);
}
.bottom-nav__item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .2rem;
  color: var(--text-muted);
  font-size: .65rem;
  font-weight: 500;
  transition: color var(--transition);
  padding: .3rem 0;
}
.bottom-nav__item i { font-size: 1.2rem; }
.bottom-nav__item.active { color: var(--primary); }
.bottom-nav__item:hover { color: var(--primary); }

/* ============================================================
   PAGES
   ============================================================ */
.page { display: none; }
.page.active { display: block; }

.page-inner { max-width: 900px; margin: 0 auto; }

.page-header { margin-bottom: 1.5rem; }
.page-header__title {
  font-family: var(--font-title);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: .4rem;
  display: flex;
  align-items: center;
  gap: .5rem;
}
.page-header__desc { color: var(--text-secondary); font-size: .9rem; }

.page-action-bar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: .75rem;
  margin-bottom: 1.25rem;
}

.section-title-row {
  display: flex; align-items: center; justify-content: space-between;
  margin: 1.5rem 0 1rem;
}
.section-title {
  font-family: var(--font-title);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex; align-items: center; gap: .4rem;
}

/* ============================================================
   HOME PAGE
   ============================================================ */
.home { max-width: 1000px; margin: 0 auto; }

/* 히어로 */
.home__hero {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  /* 포토 배경 시: 그라디언트는 오버레이로 대체 */
  background: #1E2140;
  padding: 0;
  margin-bottom: 1.5rem;
  text-align: center;
  color: #fff;
  min-height: 280px;
  display: flex;
  align-items: flex-end;
}

/* 학교 사진 레이어 */
.home__hero-photo {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.home__hero-photo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 35%;
  display: block;
  transition: transform .6s ease;
}
.home__hero:hover .home__hero-photo-img {
  transform: scale(1.03);
}
/* 사진 위 오버레이 (gradient) */
.home__hero-photo-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(30, 33, 64, .15) 0%,
    rgba(30, 33, 64, .35) 40%,
    rgba(30, 33, 64, .80) 75%,
    rgba(30, 33, 64, .92) 100%
  );
}

.home__hero-bg {
  position: absolute; inset: 0; overflow: hidden; pointer-events: none; z-index: 1;
}
.hero-shape {
  position: absolute;
  border-radius: 50%;
  background: rgba(108, 99, 255, .18);
}
.hero-shape--1 { width: 300px; height: 300px; top: -100px; right: -50px; }
.hero-shape--2 { width: 200px; height: 200px; bottom: -80px; left: -40px; }

.home__hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  padding: 2rem 2rem 2.2rem;
}

/* 학교명 배지 */
.home__hero-school-badge {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  background: rgba(108, 99, 255, .75);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,.25);
  border-radius: var(--radius-full);
  padding: .3rem 1rem;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .04em;
  margin-bottom: .7rem;
  color: #fff;
}

.home__hero-emoji { font-size: 3.5rem; margin-bottom: .5rem; line-height: 1; }
.home__hero-title {
  font-family: var(--font-title);
  font-size: 2rem;
  font-weight: 900;
  margin-bottom: .5rem;
  text-shadow: 0 2px 12px rgba(0,0,0,.45);
  color: #fff;
  line-height: 1.2;
}
.home__hero-subtitle {
  font-size: 1rem;
  opacity: .92;
  margin-bottom: 1rem;
  text-shadow: 0 1px 6px rgba(0,0,0,.4);
}
.home__hero-date {
  display: inline-block;
  background: rgba(255,255,255,.2);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-full);
  padding: .4rem 1.2rem;
  font-size: .85rem;
  font-weight: 600;
  border: 1px solid rgba(255,255,255,.2);
}

/* 생일 배너 */
.birthday-banner {
  background: linear-gradient(135deg, #FF6584, #FF9A3C);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  color: #fff;
}
.birthday-banner__inner {
  display: flex; align-items: center; gap: 1rem;
}
.birthday-banner__emoji { font-size: 2.5rem; flex-shrink: 0; }
.birthday-banner__label { font-size: .8rem; opacity: .85; }
.birthday-banner__names { font-size: 1.1rem; font-weight: 700; }
.birthday-banner__btn {
  margin-left: auto;
  background: rgba(255,255,255,.2);
  border: 1px solid rgba(255,255,255,.4);
  color: #fff;
  padding: .5rem 1rem;
  border-radius: var(--radius-full);
  font-size: .82rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition);
}
.birthday-banner__btn:hover { background: rgba(255,255,255,.35); }

/* 기능 카드 그리드 */
.home__cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.feature-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  right: 0; height: 4px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.feature-card--chatbox::before  { background: var(--chat-color); }
.feature-card--birthday::before { background: var(--birthday-color); }
.feature-card--study::before    { background: var(--study-color); }
.feature-card--umbrella::before { background: var(--umbrella-color); }

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.feature-card--chatbox:hover   { border-color: var(--chat-color); }
.feature-card--birthday:hover  { border-color: var(--birthday-color); }
.feature-card--study:hover     { border-color: var(--study-color); }
.feature-card--umbrella:hover  { border-color: var(--umbrella-color); }

.feature-card__icon-wrap {
  flex-shrink: 0;
  width: 52px; height: 52px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  background: var(--gray-100);
}
.feature-card--chatbox  .feature-card__icon-wrap { background: #F0EFFF; }
.feature-card--birthday .feature-card__icon-wrap { background: #FFF0F3; }
.feature-card--study    .feature-card__icon-wrap { background: #EDFAF5; }
.feature-card--umbrella .feature-card__icon-wrap { background: #E8F7FE; }
.feature-card__icon { font-size: 1.7rem; line-height: 1; }

.feature-card__body { flex: 1; min-width: 0; }
.feature-card__title {
  font-family: var(--font-title);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: .3rem;
}
.feature-card__desc {
  font-size: .8rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: .5rem;
}
.feature-card__tags { display: flex; flex-wrap: wrap; gap: .3rem; }
.tag {
  font-size: .68rem;
  font-weight: 600;
  padding: .2rem .55rem;
  border-radius: var(--radius-full);
  background: var(--gray-100);
  color: var(--gray-500);
}
.feature-card--chatbox  .tag { background: var(--primary-bg);    color: var(--primary); }
.feature-card--birthday .tag { background: var(--secondary-bg);  color: var(--secondary); }
.feature-card--study    .tag { background: #EDFAF5; color: #2BA87D; }
.feature-card--umbrella .tag { background: #E8F7FE; color: #1E8FC4; }

.feature-card__arrow {
  color: var(--gray-300);
  font-size: .9rem;
  align-self: center;
  flex-shrink: 0;
}
.feature-card:hover .feature-card__arrow { color: var(--gray-500); }

/* 홈 위젯 */
.home__bottom-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.home-widget {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.home-widget__header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 1.1rem .75rem;
  border-bottom: 1px solid var(--gray-100);
}
.home-widget__title {
  font-size: .9rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex; align-items: center; gap: .4rem;
}
.home-widget__title i { color: var(--primary); font-size: .85rem; }
.home-widget__more {
  font-size: .75rem;
  color: var(--primary);
  font-weight: 600;
  padding: .2rem .5rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.home-widget__more:hover { background: var(--primary-bg); }
.home-widget__body { padding: .75rem 1.1rem; min-height: 80px; }

.widget-empty {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: .5rem;
  padding: 1rem;
  color: var(--text-muted);
  text-align: center;
}
.widget-empty i { font-size: 1.5rem; }
.widget-empty p { font-size: .8rem; line-height: 1.5; }
.widget-empty.large { padding: 3rem 1rem; }
.widget-empty.large i { font-size: 2.5rem; }
.widget-empty.large p { font-size: .9rem; }

/* 위젯 아이템 */
.widget-item {
  display: flex; align-items: center; gap: .6rem;
  padding: .45rem 0;
  border-bottom: 1px solid var(--gray-100);
  font-size: .8rem;
  cursor: pointer;
  transition: color var(--transition);
}
.widget-item:last-child { border-bottom: none; }
.widget-item:hover { color: var(--primary); }
.widget-item__icon { flex-shrink: 0; }
.widget-item__text { flex: 1; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.widget-item__date { color: var(--text-muted); font-size: .72rem; flex-shrink: 0; }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .6rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: .9rem;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
}
.btn--primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  box-shadow: 0 4px 12px rgba(108,99,255,.3);
}
.btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(108,99,255,.4);
}
.btn--secondary {
  background: var(--gray-100);
  color: var(--text-secondary);
}
.btn--secondary:hover { background: var(--gray-200); }
.btn--danger {
  background: linear-gradient(135deg, #FF6584, #FF4D6D);
  color: #fff;
  box-shadow: 0 4px 12px rgba(255,101,132,.3);
}
.btn--danger:hover { transform: translateY(-1px); }
.btn--success {
  background: linear-gradient(135deg, #43D9AD, #2AB890);
  color: #fff;
  box-shadow: 0 4px 12px rgba(67,217,173,.3);
}
.btn--sm {
  padding: .35rem .8rem;
  font-size: .78rem;
}

/* ============================================================
   FILTER TABS
   ============================================================ */
.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.25rem;
}
.filter-tab {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .45rem 1rem;
  border-radius: var(--radius-full);
  font-size: .82rem;
  font-weight: 600;
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 2px solid var(--gray-200);
  transition: all var(--transition);
  cursor: pointer;
}
.filter-tab:hover { border-color: var(--primary); color: var(--primary); }
.filter-tab.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(108,99,255,.3);
}

/* ============================================================
   CHAT LIST
   ============================================================ */
.chat-list { display: flex; flex-direction: column; gap: .75rem; }
.chat-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.25rem;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all var(--transition);
  border-left: 4px solid transparent;
}
.chat-card:hover { transform: translateX(4px); box-shadow: var(--shadow-md); }
.chat-card[data-cat="study"]  { border-color: var(--chat-color); }
.chat-card[data-cat="class"]  { border-color: var(--accent-green); }
.chat-card[data-cat="friend"] { border-color: var(--secondary); }
.chat-card[data-cat="etc"]    { border-color: var(--accent-yellow); }

.chat-card__top {
  display: flex; align-items: center; gap: .6rem;
  margin-bottom: .5rem;
}
.chat-card__cat {
  display: inline-flex; align-items: center; gap: .3rem;
  font-size: .72rem;
  font-weight: 700;
  padding: .18rem .55rem;
  border-radius: var(--radius-full);
}
.cat--study  { background: var(--primary-bg);   color: var(--primary); }
.cat--class  { background: #EDFAF5; color: #2BA87D; }
.cat--friend { background: var(--secondary-bg); color: var(--secondary); }
.cat--etc    { background: #FFF8E6; color: #CC8800; }

.chat-card__anon {
  font-size: .72rem;
  color: var(--text-muted);
  background: var(--gray-100);
  padding: .18rem .5rem;
  border-radius: var(--radius-full);
}
.chat-card__date {
  margin-left: auto;
  font-size: .72rem;
  color: var(--text-muted);
}
.chat-card__content {
  font-size: .88rem;
  color: var(--text-primary);
  line-height: 1.6;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.chat-card__footer {
  margin-top: .6rem;
  display: flex; align-items: center; justify-content: space-between;
}
.chat-card__author { font-size: .78rem; color: var(--text-muted); }
.chat-card__delete {
  font-size: .75rem;
  color: var(--secondary);
  padding: .2rem .6rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.chat-card__delete:hover { background: var(--secondary-bg); }

/* 소통함 삭제 버튼 (관리자용) */
.btn--danger-sm {
  display: inline-flex; align-items: center; gap: .3rem;
  font-size: .75rem; font-weight: 600;
  color: var(--secondary);
  background: var(--secondary-bg);
  border: 1px solid rgba(255,101,132,.25);
  padding: .25rem .65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
  white-space: nowrap;
}
.btn--danger-sm:hover {
  background: var(--secondary);
  color: #fff;
  transform: scale(1.04);
}

/* ============================================================
   BIRTHDAY PAGE
   ============================================================ */
.history-card {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 1.5rem;
  color: #fff;
}
.history-card__header {
  padding: .9rem 1.25rem;
  font-size: .9rem;
  font-weight: 700;
  background: rgba(0,0,0,.15);
  display: flex; align-items: center; gap: .5rem;
}
.history-card__body { padding: 1rem 1.25rem; font-size: .88rem; line-height: 1.8; }

.birthday-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: .75rem; }
.birthday-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 1.1rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition);
  position: relative;
}
.birthday-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.birthday-card--today {
  background: linear-gradient(135deg, #FF6584, #FF9A3C);
  color: #fff;
}
.birthday-card__emoji { font-size: 2rem; margin-bottom: .4rem; }
.birthday-card__name { font-weight: 700; font-size: .95rem; }
.birthday-card__date { font-size: .78rem; color: var(--text-muted); margin-top: .2rem; }
.birthday-card--today .birthday-card__date { color: rgba(255,255,255,.8); }
.birthday-card__msg { font-size: .78rem; color: var(--text-secondary); margin-top: .35rem; font-style: italic; }
.birthday-card--today .birthday-card__msg { color: rgba(255,255,255,.85); }
.birthday-card__today-badge {
  position: absolute; top: .5rem; right: .5rem;
  background: rgba(255,255,255,.25);
  color: #fff;
  font-size: .65rem; font-weight: 700;
  padding: .15rem .4rem;
  border-radius: var(--radius-full);
}
.birthday-card__delete-btn {
  position: absolute; top: .5rem; left: .5rem;
  background: rgba(255,101,132,.1);
  color: var(--secondary);
  font-size: .7rem;
  padding: .2rem .5rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.birthday-card__delete-btn:hover { background: var(--secondary-bg); }

/* ---- 생일 오늘 별자리 특별 카드 ---- */
.birthday-card--zodiac {
  background: linear-gradient(145deg, #FF6584 0%, #FF9A3C 55%, #FFD166 100%);
  color: #fff;
  padding: 1.4rem;
  text-align: left;
  grid-column: 1 / -1; /* 전체 너비 */
}
.birthday-card__header-row {
  display: flex; align-items: center; gap: .8rem;
  margin-bottom: .7rem;
}
.birthday-card__emoji-big { font-size: 2.8rem; line-height: 1; }
.birthday-card__zodiac-badge {
  display: inline-block;
  background: rgba(255,255,255,.25);
  color: #fff;
  font-size: .72rem; font-weight: 700;
  padding: .25rem .7rem;
  border-radius: var(--radius-full);
  margin-bottom: .65rem;
  letter-spacing: .03em;
}
.birthday-card__celeb-msg {
  background: rgba(255,255,255,.18);
  border-left: 3px solid rgba(255,255,255,.6);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: .6rem .8rem;
  font-size: .88rem; line-height: 1.65;
  white-space: pre-line;
  margin-bottom: .8rem;
}
.birthday-card__zodiac-grid {
  display: flex; flex-direction: column; gap: .5rem;
}
.birthday-card__zodiac-item .label,
.birthday-card__zodiac-mini .label {
  display: block; font-size: .65rem; opacity: .75; font-weight: 700;
  text-transform: uppercase; letter-spacing: .04em; margin-bottom: .15rem;
}
.birthday-card__zodiac-item .value {
  font-size: .8rem; line-height: 1.5;
}
.birthday-card__zodiac-row {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: .4rem;
}
.birthday-card__zodiac-mini {
  background: rgba(255,255,255,.15);
  border-radius: var(--radius-sm);
  padding: .45rem .6rem;
}
.birthday-card__zodiac-mini .value {
  font-size: .78rem; font-weight: 600;
}
.birthday-card__zodiac-strengths {
  display: flex; flex-wrap: wrap; gap: .35rem;
}
.strength-tag {
  background: rgba(255,255,255,.28);
  color: #fff;
  font-size: .7rem; font-weight: 700;
  padding: .2rem .55rem;
  border-radius: var(--radius-full);
}
.birthday-card--today .birthday-card__name { color: #fff; }
.birthday-card__msg--today {
  margin-top: .65rem;
  font-size: .8rem; font-style: italic;
  opacity: .88;
}

@media (min-width: 480px) {
  .birthday-card__zodiac-row { grid-template-columns: repeat(4, 1fr); }
}

/* ============================================================
   STUDY PAGE
   ============================================================ */
.study-action-bar {
  justify-content: space-between;
}
.search-box {
  display: flex; align-items: center; gap: .5rem;
  background: var(--bg-card);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-md);
  padding: .5rem .9rem;
  flex: 1; max-width: 340px;
  transition: border-color var(--transition);
}
.search-box:focus-within { border-color: var(--primary); }
.search-box i { color: var(--gray-400); font-size: .9rem; }
.search-box input {
  flex: 1; border: none; outline: none;
  font-size: .88rem; color: var(--text-primary);
  background: transparent;
}

.study-list { display: flex; flex-direction: column; gap: .75rem; }
.study-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.25rem;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all var(--transition);
  display: flex; align-items: flex-start; gap: 1rem;
}
.study-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.study-card__icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-md);
  background: #EDFAF5;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}
.study-card__body { flex: 1; min-width: 0; }
.study-card__title {
  font-weight: 700; font-size: .95rem;
  color: var(--text-primary);
  margin-bottom: .2rem;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.study-card__excerpt {
  font-size: .82rem;
  color: var(--text-secondary);
  line-height: 1.5;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  margin-bottom: .4rem;
}
.study-card__meta {
  display: flex; align-items: center; gap: .75rem;
  font-size: .75rem; color: var(--text-muted);
}
.study-card__meta i { font-size: .7rem; }
.study-card__file-badge {
  display: inline-flex; align-items: center; gap: .25rem;
  font-size: .72rem;
  background: #EDFAF5;
  color: #2BA87D;
  padding: .15rem .5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
}
.study-card__actions {
  display: flex; flex-direction: column; align-items: flex-end; gap: .4rem;
  flex-shrink: 0;
}

/* ============================================================
   UMBRELLA PAGE
   ============================================================ */
.umbrella-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.umbrella-stat {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 1.2rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.umbrella-stat--active { border-top: 3px solid var(--secondary); }
.umbrella-stat--ok     { border-top: 3px solid var(--accent-green); }
.umbrella-stat__num {
  font-family: var(--font-title);
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
}
.umbrella-stat__label { font-size: .78rem; color: var(--text-muted); font-weight: 500; }

.umbrella-list { display: flex; flex-direction: column; gap: .75rem; }
.umbrella-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.25rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: all var(--transition);
}
.umbrella-card:hover { box-shadow: var(--shadow-md); }
.umbrella-card--overdue { border-left: 4px solid var(--secondary); }
.umbrella-card__icon {
  width: 46px; height: 46px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  background: #E8F7FE;
  flex-shrink: 0;
}
.umbrella-card--returned .umbrella-card__icon { background: #EDFAF5; }
.umbrella-card__body { flex: 1; min-width: 0; }
.umbrella-card__name { font-weight: 700; font-size: .95rem; }
.umbrella-card__info {
  display: flex; flex-wrap: wrap; gap: .5rem .75rem;
  margin-top: .3rem;
  font-size: .78rem; color: var(--text-muted);
}
.umbrella-card__info i { margin-right: .2rem; }
.umbrella-card__status {
  font-size: .72rem; font-weight: 700;
  padding: .2rem .6rem;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}
.status--renting  { background: #FFF0F3; color: var(--secondary); }
.status--returned { background: #EDFAF5; color: #2BA87D; }
.status--overdue  { background: #FFE9EC; color: #E63553; animation: pulse 2s infinite; }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .6; }
}

.umbrella-card__actions { display: flex; gap: .4rem; flex-shrink: 0; }

/* ============================================================
   MODALS
   ============================================================ */
.modal {
  position: fixed; inset: 0;
  z-index: 300;
  display: flex; align-items: center; justify-content: center;
  padding: 1rem;
}
.modal.hidden { display: none; }
.modal__overlay {
  position: absolute; inset: 0;
  background: rgba(29,33,64,.6);
  backdrop-filter: blur(4px);
}
.modal__box {
  position: relative; z-index: 1;
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  animation: modalIn .25s ease;
}
.modal__box--large { max-width: 640px; }
.modal__box--xlarge { max-width: 780px; }

@keyframes modalIn {
  from { opacity: 0; transform: translateY(20px) scale(.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.modal__header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.25rem 1.5rem 1rem;
  border-bottom: 1px solid var(--gray-100);
  position: sticky; top: 0;
  background: var(--bg-card);
  z-index: 1;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}
.modal__title {
  font-family: var(--font-title);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex; align-items: center; gap: .5rem;
}
.modal__title i { color: var(--primary); }
.modal__close {
  width: 32px; height: 32px;
  border-radius: var(--radius-sm);
  background: var(--gray-100);
  color: var(--gray-500);
  display: flex; align-items: center; justify-content: center;
  font-size: .9rem;
  transition: all var(--transition);
}
.modal__close:hover { background: var(--secondary-bg); color: var(--secondary); }
.modal__body { padding: 1.25rem 1.5rem; }
.modal__footer {
  display: flex; justify-content: flex-end; gap: .6rem;
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--gray-100);
}

/* ============================================================
   FORMS
   ============================================================ */
.form-group { margin-bottom: 1.1rem; }
.form-label {
  display: block;
  font-size: .85rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: .4rem;
}
.form-control {
  width: 100%;
  padding: .65rem .9rem;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-md);
  font-size: .9rem;
  color: var(--text-primary);
  background: var(--gray-50);
  transition: border-color var(--transition);
  outline: none;
}
.form-control:focus { border-color: var(--primary); background: #fff; }
textarea.form-control { resize: vertical; min-height: 100px; }

.char-count {
  text-align: right;
  font-size: .72rem;
  color: var(--text-muted);
  margin-top: .3rem;
}

.radio-group { display: flex; flex-wrap: wrap; gap: .5rem; }
.radio-label {
  display: flex; align-items: center; gap: .4rem;
  padding: .45rem .9rem;
  border-radius: var(--radius-full);
  border: 2px solid var(--gray-200);
  cursor: pointer;
  font-size: .82rem;
  font-weight: 600;
  transition: all var(--transition);
}
.radio-label:hover { border-color: var(--primary); color: var(--primary); }
.radio-label input[type="radio"] { display: none; }
.radio-label:has(input:checked) {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* 토글 스위치 */
.anon-toggle { display: flex; align-items: center; }
.toggle-label {
  display: flex; align-items: center; gap: .75rem;
  cursor: pointer;
  font-size: .85rem;
  font-weight: 600;
}
.toggle-label input { display: none; }
.toggle-slider {
  position: relative;
  width: 44px; height: 24px;
  border-radius: 12px;
  background: var(--gray-300);
  transition: background var(--transition);
  flex-shrink: 0;
}
.toggle-slider::after {
  content: '';
  position: absolute;
  left: 3px; top: 3px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: #fff;
  transition: transform var(--transition);
  box-shadow: 0 1px 4px rgba(0,0,0,.2);
}
.toggle-label input:checked ~ .toggle-slider { background: var(--primary); }
.toggle-label input:checked ~ .toggle-slider::after { transform: translateX(20px); }

/* 파일 드롭존 */
.file-drop-zone {
  border: 2px dashed var(--gray-300);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--gray-50);
}
.file-drop-zone:hover, .file-drop-zone.dragover {
  border-color: var(--primary);
  background: var(--primary-bg);
}
.file-drop-zone__inner i { font-size: 2rem; color: var(--gray-400); margin-bottom: .5rem; }
.file-drop-zone:hover .file-drop-zone__inner i { color: var(--primary); }
.file-drop-zone__inner p { font-size: .88rem; color: var(--text-secondary); font-weight: 600; }
.file-drop-zone__hint { font-size: .75rem; color: var(--text-muted); }

.file-preview-area { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .75rem; }
.file-preview-item {
  display: flex; align-items: center; gap: .4rem;
  background: var(--gray-100);
  border-radius: var(--radius-sm);
  padding: .35rem .6rem;
  font-size: .78rem;
  max-width: 200px;
}
.file-preview-item i { color: var(--gray-500); flex-shrink: 0; }
.file-preview-item span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.file-preview-item button {
  color: var(--secondary);
  font-size: .7rem;
  flex-shrink: 0;
  margin-left: .2rem;
}
.file-preview-image {
  width: 60px; height: 60px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* ============================================================
   BIRTHDAY POPUP
   ============================================================ */
.birthday-popup {
  position: fixed; inset: 0;
  z-index: 500;
  display: flex; align-items: center; justify-content: center;
  padding: 1rem;
}
.birthday-popup.hidden { display: none; }
.birthday-popup__overlay {
  position: absolute; inset: 0;
  background: rgba(0,0,0,.6);
}
.birthday-popup__box {
  position: relative; z-index: 1;
  background: linear-gradient(135deg, #fff9fb, #fff);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2rem;
  text-align: center;
  max-width: 380px;
  width: 100%;
  box-shadow: var(--shadow-xl);
  animation: popupIn .4s cubic-bezier(.34,1.56,.64,1);
}
@keyframes popupIn {
  from { opacity: 0; transform: scale(.7); }
  to   { opacity: 1; transform: scale(1); }
}
.birthday-popup__confetti { position: absolute; inset: 0; overflow: hidden; pointer-events: none; border-radius: var(--radius-xl); }
.birthday-popup__close {
  position: absolute; top: 1rem; right: 1rem;
  width: 30px; height: 30px;
  border-radius: 50%;
  background: var(--gray-100);
  color: var(--gray-500);
  display: flex; align-items: center; justify-content: center;
  font-size: .8rem;
}
.birthday-popup__emoji { font-size: 4rem; margin-bottom: .5rem; animation: bounce 1s infinite; }
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-10px); }
}
.birthday-popup__title {
  font-family: var(--font-title);
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--secondary);
  margin-bottom: .75rem;
}
.birthday-popup__names {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: .5rem;
  line-height: 1.8;
}
.birthday-popup__msg { font-size: .9rem; color: var(--text-secondary); margin-bottom: 1.25rem; }
.birthday-popup__btn { width: 100%; justify-content: center; }

/* 컨페티 조각 */
.confetti-piece {
  position: absolute;
  width: 8px; height: 8px;
  top: -10px;
  animation: confetti-fall linear infinite;
  border-radius: 2px;
}
@keyframes confetti-fall {
  0%   { transform: translateY(-10px) rotate(0deg); opacity: 1; }
  100% { transform: translateY(400px) rotate(720deg); opacity: 0; }
}

/* ============================================================
   TOAST
   ============================================================ */
.toast-container {
  position: fixed;
  bottom: calc(var(--bottom-nav-height) + 1rem);
  right: 1rem;
  z-index: 400;
  display: flex; flex-direction: column; gap: .5rem;
}
.toast {
  display: flex; align-items: center; gap: .6rem;
  background: var(--gray-800);
  color: #fff;
  padding: .8rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: .85rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  min-width: 240px;
  max-width: 340px;
  animation: toastIn .3s ease;
}
.toast--success { background: linear-gradient(135deg, #43D9AD, #2AB890); }
.toast--error   { background: linear-gradient(135deg, #FF6584, #FF4D6D); }
.toast--warn    { background: linear-gradient(135deg, #FFD166, #FFBA00); color: var(--gray-800); }
@keyframes toastIn {
  from { opacity: 0; transform: translateX(20px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ============================================================
   ADMIN
   ============================================================ */
.admin-modal__desc { font-size: .88rem; color: var(--text-secondary); margin-bottom: .75rem; }
.admin-error {
  display: flex; align-items: center; gap: .4rem;
  color: var(--secondary); font-size: .78rem;
  margin-top: .4rem;
}

/* 관리자 전용 요소 */
.admin-only { display: none !important; }
body.admin-mode .admin-only { display: flex !important; }
body.admin-mode .admin-only.chat-card__delete { display: inline-flex !important; }

/* ============================================================
   LOADING
   ============================================================ */
.loading-spinner {
  display: flex; align-items: center; gap: .5rem;
  color: var(--text-muted); font-size: .85rem;
  padding: 1rem;
}

/* ============================================================
   REPLY SECTION — 공부방 답변
   ============================================================ */
.reply-section {
  margin-top: 1.75rem;
  padding-top: 1.25rem;
  border-top: 2px dashed var(--gray-200);
}
.reply-section__header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 1rem;
}
.reply-section__title {
  font-family: var(--font-title);
  font-size: 1rem;
  font-weight: 800;
  color: var(--text-primary);
  display: flex; align-items: center; gap: .4rem;
}
.reply-section__title i { color: var(--primary); }
.reply-count {
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--primary);
  color: #fff;
  font-size: .7rem;
  font-weight: 700;
  min-width: 20px; height: 20px;
  padding: 0 .4rem;
  border-radius: var(--radius-full);
  margin-left: .25rem;
}

/* 답변 목록 */
.reply-list { display: flex; flex-direction: column; gap: .75rem; margin-bottom: 1.25rem; }
.reply-item {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 1rem 1.1rem;
  position: relative;
  transition: box-shadow var(--transition);
}
.reply-item:hover { box-shadow: var(--shadow-sm); }
.reply-item__header {
  display: flex; align-items: center; gap: .6rem;
  margin-bottom: .5rem;
}
.reply-item__avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: .8rem;
  font-weight: 700;
  flex-shrink: 0;
  text-transform: uppercase;
}
.reply-item__author { font-weight: 700; font-size: .88rem; color: var(--text-primary); }
.reply-item__date { font-size: .72rem; color: var(--text-muted); margin-left: auto; }
.reply-item__content {
  font-size: .88rem;
  color: var(--text-primary);
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-all;
}
.reply-item__images {
  display: flex; flex-wrap: wrap; gap: .5rem;
  margin-top: .6rem;
}
.reply-item__image {
  width: 80px; height: 80px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 2px solid var(--gray-200);
  transition: transform var(--transition);
}
.reply-item__image:hover { transform: scale(1.05); }
.reply-item__actions {
  position: absolute; top: .7rem; right: .7rem;
  display: flex; gap: .3rem;
  opacity: 0;
  transition: opacity var(--transition);
}
.reply-item:hover .reply-item__actions { opacity: 1; }
.reply-action-btn {
  width: 26px; height: 26px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: .72rem;
  transition: all var(--transition);
}
.reply-action-btn--edit  { background: var(--primary-bg); color: var(--primary); }
.reply-action-btn--edit:hover  { background: var(--primary); color: #fff; }
.reply-action-btn--del   { background: var(--secondary-bg); color: var(--secondary); }
.reply-action-btn--del:hover   { background: var(--secondary); color: #fff; }

/* 답변 수정 하이라이트 */
.reply-item--editing {
  border-color: var(--primary);
  background: var(--primary-bg);
}

/* 답변 작성 폼 */
.reply-form {
  background: var(--bg-card);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition);
}
.reply-form:focus-within { border-color: var(--primary); }
.reply-form__header {
  background: var(--gray-100);
  padding: .6rem 1rem;
  font-size: .82rem;
  font-weight: 700;
  color: var(--text-secondary);
  display: flex; align-items: center; gap: .4rem;
}
.reply-form__row {
  display: flex;
  gap: .75rem;
  padding: .75rem 1rem 0;
}
.reply-form__textarea-wrap { flex: 1; }
.reply-form__attach {
  padding: .5rem 1rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .5rem;
}
.reply-attach-btn {
  display: inline-flex; align-items: center; gap: .35rem;
  background: var(--primary-bg);
  color: var(--primary);
  border-radius: var(--radius-full);
  padding: .3rem .8rem;
  font-size: .78rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}
.reply-attach-btn:hover { background: var(--primary); color: #fff; }
.reply-image-preview {
  display: flex; flex-wrap: wrap; gap: .4rem;
}
.reply-preview-item {
  position: relative;
  width: 56px; height: 56px;
}
.reply-preview-item img {
  width: 100%; height: 100%;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 2px solid var(--gray-200);
}
.reply-preview-item__remove {
  position: absolute; top: -6px; right: -6px;
  width: 18px; height: 18px;
  background: var(--secondary);
  color: #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: .55rem;
  cursor: pointer;
  border: 1.5px solid #fff;
}
.reply-form__actions {
  display: flex; justify-content: flex-end; gap: .5rem;
  padding: .6rem 1rem .75rem;
}

/* 이미지 라이트박스 */
.image-lightbox {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.88);
  z-index: 600;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
}
.image-lightbox img {
  max-width: 92vw; max-height: 90vh;
  border-radius: var(--radius-md);
  object-fit: contain;
  box-shadow: var(--shadow-xl);
}

/* 관리자 전체 삭제 버튼 */
.admin-delete-all-bar {
  display: flex; align-items: center; justify-content: flex-end;
  gap: .5rem;
  margin-bottom: .5rem;
}

/* ============================================================
   답변 영역 데스크/모바일 반응형
   ============================================================ */
@media (max-width: 600px) {
  .reply-form__row { flex-direction: column; }
  .reply-form__row input[type="text"] { flex: unset !important; width: 100%; }
}

/* ============================================================
   STUDY DETAIL — 게시글 상세 스타일
   ============================================================ */
.study-detail-post {
  padding-bottom: 1.25rem;
  border-bottom: 2px solid var(--gray-100);
  margin-bottom: .25rem;
}
.study-detail-post__title {
  font-family: var(--font-title);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: .5rem;
  line-height: 1.4;
}
.study-detail-post__meta {
  display: flex; flex-wrap: wrap; gap: .6rem;
  margin-bottom: .85rem;
  font-size: .78rem;
  color: var(--text-muted);
}
.study-detail-post__meta i { margin-right: .2rem; }
.study-detail-post__content {
  font-size: .92rem;
  color: var(--text-primary);
  line-height: 1.85;
  white-space: pre-wrap;
  word-break: break-all;
}
.study-detail-files {
  margin-top: 1.1rem;
  padding: 1rem;
  background: var(--gray-50);
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-200);
}
.study-detail-files__title {
  font-size: .82rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: .6rem;
  display: flex; align-items: center; gap: .35rem;
}
.study-detail-files__list {
  display: flex; flex-wrap: wrap; gap: .5rem;
}
.study-file-link {
  display: inline-flex; align-items: center; gap: .4rem;
  background: var(--bg-card);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  padding: .4rem .75rem;
  font-size: .8rem;
  color: var(--text-primary);
  text-decoration: none;
  transition: all var(--transition);
}
.study-file-link:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.study-file-link i { color: var(--primary); }

/* ============================================================
   이미지 첨부 버튼 · 링크 입력 UI (Storage 없는 무료 버전)
   ============================================================ */

/* 폼 라벨 힌트 */
.form-label-hint {
  font-size: .72rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-left: .35rem;
}

/* 이미지 첨부 버튼 */
.attach-image-btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  background: #EDFAF5;
  color: #2BA87D;
  border-radius: var(--radius-full);
  padding: .4rem 1rem;
  font-size: .82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: 1.5px solid #B2F0DA;
}
.attach-image-btn:hover { background: #43D9AD; color: #fff; border-color: #43D9AD; }

/* 링크 입력 행 */
.link-input-row {
  display: flex;
  align-items: center;
  gap: .5rem;
  flex-wrap: wrap;
}
.link-input-row .form-control { min-width: 0; }
.link-input-row .btn { flex-shrink: 0; }

/* 등록된 링크 목록 */
.post-links-area {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  margin-top: .6rem;
}
.link-item {
  display: flex;
  align-items: center;
  gap: .5rem;
  background: #EEF2FF;
  border: 1px solid #C7D2FE;
  border-radius: var(--radius-sm);
  padding: .4rem .75rem;
  font-size: .82rem;
}
.link-item i { color: #4F46E5; flex-shrink: 0; }
.link-item__text {
  flex: 1;
  color: #4F46E5;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-decoration: none;
}
.link-item__text:hover { text-decoration: underline; }
.link-item__remove {
  flex-shrink: 0;
  color: var(--secondary);
  font-size: .72rem;
  padding: .1rem .3rem;
  border-radius: 4px;
  transition: background var(--transition);
}
.link-item__remove:hover { background: var(--secondary-bg); }

/* ============================================================
   무료 플랜 안내 배너
   ============================================================ */
.free-plan-notice {
  display: flex;
  align-items: center;
  gap: .5rem;
  background: linear-gradient(135deg, #EEF2FF, #F0FDF4);
  border: 1px solid #C7D2FE;
  border-radius: var(--radius-md);
  padding: .6rem 1rem;
  font-size: .78rem;
  color: #4338CA;
  margin-bottom: 1rem;
}
.free-plan-notice i { color: #22C55E; }

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--gray-300); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--gray-400); }

/* ============================================================
   RESPONSIVE — 태블릿 (max 1024px)
   ============================================================ */
@media (max-width: 1024px) {
  .home__bottom-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================================
   RESPONSIVE — 모바일 (max 768px)
   ============================================================ */
@media (max-width: 768px) {
  :root { --sidebar-width: 0px; }

  .layout { margin-left: 0; padding-bottom: var(--bottom-nav-height); }

  .sidebar {
    width: 260px;
    transform: translateX(-100%);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay.open { display: block; }
  .sidebar__close-btn { display: flex; }

  .header__menu-btn { display: flex; }

  .bottom-nav { display: flex; }

  .main-content { padding: 1rem; }

  .home__hero { min-height: 220px; }
  .home__hero-content { padding: 1.5rem 1.25rem 1.75rem; }
  .home__hero-title { font-size: 1.5rem; }
  .home__hero-school-badge { font-size: .72rem; }

  .home__cards { grid-template-columns: 1fr; }
  .home__bottom-grid { grid-template-columns: 1fr; }

  .feature-card { padding: 1rem; }

  .umbrella-stats { grid-template-columns: repeat(3, 1fr); gap: .5rem; }
  .umbrella-stat { padding: .9rem .5rem; }
  .umbrella-stat__num { font-size: 1.5rem; }

  .birthday-list { grid-template-columns: repeat(2, 1fr); }

  .modal__box { max-width: 100%; margin: 0; border-radius: var(--radius-xl) var(--radius-xl) 0 0; }
  .modal { align-items: flex-end; padding: 0; }

  .toast-container { bottom: calc(var(--bottom-nav-height) + .75rem); right: .75rem; left: .75rem; }
  .toast { min-width: unset; max-width: 100%; }

  .page-header__title { font-size: 1.3rem; }

  .filter-tabs { gap: .35rem; }
  .filter-tab { padding: .4rem .75rem; font-size: .78rem; }

  .birthday-banner__btn { display: none; }

  .study-action-bar { flex-direction: column; align-items: stretch; }
  .search-box { max-width: 100%; }
}

/* ============================================================
   RESPONSIVE — 소형 (max 480px)
   ============================================================ */
@media (max-width: 480px) {
  .birthday-list { grid-template-columns: 1fr; }
  .umbrella-card { flex-wrap: wrap; }
  .umbrella-card__actions { width: 100%; justify-content: flex-end; }
  .radio-group { gap: .35rem; }
  .radio-label { padding: .35rem .7rem; font-size: .78rem; }
}