/* SKU14 공모전 게시판
 * 짙은 잉크색 사이드바 + 인디고 포인트 + 카드형 콘텐츠.
 * AI 관련 요소는 바이올렛→시안 그라데이션 하나로 묶어 구분한다.
 *
 * 구성 방법
 *   - 색·간격·그림자는 모두 :root 의 CSS 변수(--이름)로 정의하고, 규칙에서는 var(--이름)으로 쓴다.
 *     그래서 다크 모드는 변수 값만 바꾸면 화면 전체가 따라 바뀐다.
 *   - 파일은 "═══ 구역 이름" 주석으로 화면 부분별로 나뉜다 (사이드바, 본문 틀, 히어로, 목록 ...).
 *   - 반응형: 맨 아래 @media 에서 960px 이하(사이드바 접기), 640px 이하(휴대폰) 배치를 고친다. */

/* ─── 디자인 토큰 (밝은 테마 기본값) ─── */
:root {
  /* 사이드바 (짙은 남색 계열) */
  --sidebar:        #0e1325;
  --sidebar-2:      #121a33;
  --sidebar-on:     rgba(255, 255, 255, .08);
  --sidebar-text:   #b9c2d8;
  --sidebar-dim:    #6f7a95;

  /* 브랜드 포인트 색 (인디고). soft = 옅은 배경용, ring = 포커스·선택 테두리용 반투명 */
  --brand:          #4f46e5;
  --brand-dark:     #4338ca;
  --brand-soft:     #eef0ff;
  --brand-ring:     rgba(79, 70, 229, .22);

  /* AI 요소 전용 그라데이션 (바이올렛 → 시안) */
  --ai-1:           #7c3aed;
  --ai-2:           #0ea5e9;
  --ai-soft:        #f4f0ff;
  --ai-grad:        linear-gradient(120deg, var(--ai-1), var(--ai-2));

  /* 바탕(bg) → 카드(surface) → 카드 안 회색 칸(surface-2) 순으로 겹쳐 쌓인다 */
  --bg:             #f4f5fa;
  --surface:        #ffffff;
  --surface-2:      #f7f8fc;
  --border:         #e5e7f0;
  --border-strong:  #d4d8e6;

  /* 글자색: 본문 / 보조 / 흐린 설명 */
  --text:           #141826;
  --text-2:         #3a4153;
  --muted:          #6b7385;

  /* 상태 색: 가능(ok) / 임박(warn) / 금지·오류(danger) / 좋아요(like) */
  --ok:             #0f8a5f;
  --ok-soft:        #e3f6ee;
  --warn:           #b45309;
  --warn-soft:      #fef3e2;
  --danger:         #c0362c;
  --like:           #e0245e;

  /* 게시물 종류 배지 색 (공모전 / 해커톤 / 기타) */
  --k-contest:      #4f46e5;
  --k-contest-soft: #eef0ff;
  --k-hack:         #0e7490;
  --k-hack-soft:    #e1f5f9;
  --k-etc:          #6b7385;
  --k-etc-soft:     #f0f1f5;

  /* 모서리 둥글기, 사이드바 폭, 그림자 3단계, 움직임 가속 곡선 */
  --radius:         16px;
  --radius-sm:      10px;
  --sidebar-w:      252px;
  --shadow-sm:      0 1px 2px rgba(16, 24, 48, .05);
  --shadow:         0 1px 2px rgba(16, 24, 48, .04), 0 6px 24px -8px rgba(16, 24, 48, .10);
  --shadow-lg:      0 2px 4px rgba(16, 24, 48, .04), 0 18px 40px -12px rgba(16, 24, 48, .18);
  --ease:           cubic-bezier(.2, .7, .2, 1);
}

/* ─── 다크 모드 ───
 * 1) 운영체제가 다크 모드이고, 사용자가 밝은 테마를 직접 고르지 않았을 때 (data-theme="light" 가 아님)
 * 2) 또는 data-theme="dark" 를 명시했을 때 (아래 두 번째 블록, 값은 같다)
 * 변수 값만 바꾸므로 나머지 규칙은 그대로 둔다. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --sidebar: #0a0e1b; --sidebar-2: #0d1222; --sidebar-on: rgba(255, 255, 255, .07);
    --sidebar-text: #a9b3cb; --sidebar-dim: #5f6a85;
    --brand: #8b85ff; --brand-dark: #a8a3ff; --brand-soft: #1e1f3d; --brand-ring: rgba(139, 133, 255, .3);
    --ai-1: #a78bfa; --ai-2: #38bdf8; --ai-soft: #1f1a33;
    --bg: #0c1019; --surface: #141927; --surface-2: #1a2031; --border: #262d40; --border-strong: #323a50;
    --text: #e8ebf3; --text-2: #c3c9d8; --muted: #8d96aa;
    --ok: #4ad19a; --ok-soft: #12302a; --warn: #f0b45a; --warn-soft: #34270f; --danger: #f2766c;
    --like: #ff6b9a;
    --k-contest: #a8a3ff; --k-contest-soft: #1e1f3d; --k-hack: #5fd0e6; --k-hack-soft: #0f2a31;
    --k-etc: #a2a9ba; --k-etc-soft: #20263a;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px -10px rgba(0, 0, 0, .5);
    --shadow-lg: 0 2px 4px rgba(0, 0, 0, .3), 0 20px 40px -14px rgba(0, 0, 0, .6);
  }
}

:root[data-theme="dark"] {
  --sidebar: #0a0e1b; --sidebar-2: #0d1222; --sidebar-on: rgba(255, 255, 255, .07);
  --sidebar-text: #a9b3cb; --sidebar-dim: #5f6a85;
  --brand: #8b85ff; --brand-dark: #a8a3ff; --brand-soft: #1e1f3d; --brand-ring: rgba(139, 133, 255, .3);
  --ai-1: #a78bfa; --ai-2: #38bdf8; --ai-soft: #1f1a33;
  --bg: #0c1019; --surface: #141927; --surface-2: #1a2031; --border: #262d40; --border-strong: #323a50;
  --text: #e8ebf3; --text-2: #c3c9d8; --muted: #8d96aa;
  --ok: #4ad19a; --ok-soft: #12302a; --warn: #f0b45a; --warn-soft: #34270f; --danger: #f2766c;
  --like: #ff6b9a;
  --k-contest: #a8a3ff; --k-contest-soft: #1e1f3d; --k-hack: #5fd0e6; --k-hack-soft: #0f2a31;
  --k-etc: #a2a9ba; --k-etc-soft: #20263a;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px -10px rgba(0, 0, 0, .5);
  --shadow-lg: 0 2px 4px rgba(0, 0, 0, .3), 0 20px 40px -14px rgba(0, 0, 0, .6);
}

/* ─── 기본 규칙 ─── */

/* width 에 padding·border 를 포함해 계산 (크기 계산이 직관적이 된다) */
* { box-sizing: border-box; }

/* display 를 지정한 요소에도 hidden 속성이 이기도록 */
/* (예: .card { display: grid } 인 요소에 hidden 을 줘도 확실히 숨는다. app.js 는 hidden 속성으로 보이고 숨긴다) */
[hidden] { display: none !important; }

html, body { height: 100%; }

/* 글꼴: Pretendard 를 우선 쓰고, 없으면 맑은 고딕 → 시스템 글꼴 순으로 대체.
 * font 단축 속성 15px/1.65 = 글자 크기 15px, 줄 높이 1.65배 */
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.65 "Pretendard Variable", Pretendard, "Malgun Gothic", "맑은 고딕",
        system-ui, -apple-system, sans-serif;
  letter-spacing: -.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

::selection { background: var(--brand-ring); }

/* 아이콘 svg: 부모 크기를 채우고, 선 아이콘으로 그리며 색은 글자색(currentColor)을 따른다 */
svg { width: 100%; height: 100%; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* 키보드(Tab)로 이동할 때만 포커스 테두리를 보인다 (마우스 클릭 때는 보이지 않음) - 접근성 */
:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }

/* ═══════════════════════════════════════════════════ 사이드바 */

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar-w);
  background:
    radial-gradient(120% 50% at 0% 0%, rgba(124, 58, 237, .18), transparent 60%),
    linear-gradient(180deg, var(--sidebar), var(--sidebar-2));
  display: flex;
  flex-direction: column;
  z-index: 40;
  border-right: 1px solid rgba(255, 255, 255, .04);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 68px;
  padding: 0 22px;
  color: #fff;
  flex-shrink: 0;
}
.logo:hover { text-decoration: none; }

.logo-mark { font-size: 20px; font-weight: 800; letter-spacing: -.5px; }
.logo-mark b {
  background: var(--ai-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 800;
}
.logo-divider { width: 1px; height: 16px; background: rgba(255, 255, 255, .2); }
.logo-text { font-size: 13.5px; color: #cdd5ea; font-weight: 600; }

.sidenav { padding: 8px 12px; display: flex; flex-direction: column; gap: 3px; }

.sidenav a {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 11px;
  color: var(--sidebar-text);
  font-size: 14px;
  transition: background .15s var(--ease), color .15s var(--ease);
}
.sidenav a:hover { background: rgba(255, 255, 255, .05); color: #fff; text-decoration: none; }
.sidenav a.on { background: var(--sidebar-on); color: #fff; }
.sidenav a.on::before {
  content: "";
  position: absolute;
  left: -12px;
  top: 10px;
  bottom: 10px;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--ai-grad);
}

.sidenav .ico { width: 19px; height: 19px; flex-shrink: 0; opacity: .85; }
.sidenav a.on .ico { opacity: 1; }
.sidenav .label { display: flex; flex-direction: column; line-height: 1.3; font-weight: 600; }
.sidenav .label small { font-size: 11px; font-weight: 400; color: var(--sidebar-dim); letter-spacing: .01em; }
.sidenav a.on .label small { color: #aab4f0; }

.sidefoot {
  margin-top: auto;
  padding: 18px 22px 22px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--sidebar-dim);
}
.sidefoot p { margin: 0 0 4px; }
.sidefoot .dim { opacity: .7; }

/* ═══════════════════════════════════════════════════ 본문 틀 */

.shell {
  margin-left: var(--sidebar-w);
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

/* 상단바: 스크롤해도 위에 붙어 있고(sticky), 뒤 내용이 흐리게 비치는 유리 효과(backdrop-filter).
 * color-mix 로 배경색을 78% 만 섞어 반투명하게 만든다. */
.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 32px;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: saturate(1.6) blur(14px);
  -webkit-backdrop-filter: saturate(1.6) blur(14px);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
}

.hamburger {
  display: none;
  width: 38px; height: 38px;
  padding: 8px;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
}
.hamburger:hover { background: var(--surface-2); }

.page-title { font-size: 16px; font-weight: 700; margin: 0; letter-spacing: -.2px; }

.topbar-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
}
.topbar-right > a {
  font-weight: 600;
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--brand);
  color: #fff;
}
.topbar-right > a:hover { background: var(--brand-dark); text-decoration: none; }

.avatar {
  width: 34px; height: 34px;
  border-radius: 50%;
  background: var(--ai-grad);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
  box-shadow: 0 0 0 3px var(--surface);
}

.whoami { display: flex; flex-direction: column; line-height: 1.25; }
.whoami b { font-size: 13.5px; font-weight: 700; }
.whoami small { font-size: 11.5px; color: var(--muted); }

/* ═══════════════════════════════════════════════════ 히어로 */

.hero {
  position: relative;
  overflow: hidden;
  margin: 24px 32px 0;
  max-width: 1116px;
  border-radius: 22px;
  color: #fff;
  padding: 34px 36px 36px;
  background:
    radial-gradient(60% 120% at 0% 0%, rgba(124, 58, 237, .75), transparent 60%),
    radial-gradient(50% 120% at 100% 0%, rgba(14, 165, 233, .6), transparent 60%),
    radial-gradient(60% 80% at 70% 120%, rgba(79, 70, 229, .7), transparent 70%),
    #1b1946;
  box-shadow: var(--shadow-lg);
}
.hero::after {
  /* 은은한 격자 */
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(90deg, transparent, #000 40%, #000 70%, transparent);
  pointer-events: none;
}
.hero > * { position: relative; z-index: 1; }

.hero h2 {
  margin: 0 0 10px;
  font-size: 30px;
  font-weight: 800;
  letter-spacing: -.8px;
  line-height: 1.3;
}
.hero h2 u {
  text-decoration: none;
  background: linear-gradient(90deg, #c4b5fd, #7dd3fc);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero .sub {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13.5px;
}
.hero .sub span {
  padding: 4px 11px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .12);
  border: 1px solid rgba(255, 255, 255, .16);
  color: rgba(255, 255, 255, .95);
}

.hero .act { margin-top: 20px; display: flex; gap: 10px; flex-wrap: wrap; }

.hero .btn-light {
  background: #fff;
  color: #1b1946;
  font-weight: 700;
  padding: 9px 18px;
  border-radius: 999px;
  font-size: 14px;
  box-shadow: 0 6px 20px -6px rgba(0, 0, 0, .4);
  transition: transform .15s var(--ease);
}
.hero .btn-light:hover { text-decoration: none; transform: translateY(-1px); }

/* ═══════════════════════════════════════════════════ 콘텐츠 */

main {
  flex: 1;
  padding: 24px 32px 56px;
  max-width: 1180px;
  width: 100%;
}

.stack { display: flex; flex-direction: column; gap: 20px; }
.stack-sm { display: flex; flex-direction: column; gap: 14px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 24px;
}

.card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.card-head h2 { margin: 0; font-size: 17px; font-weight: 700; letter-spacing: -.3px; }
.card-head .check { margin-left: auto; }
.card-head > .muted:last-child { margin-left: auto; }

h3 { font-size: 14px; margin: 0 0 9px; }

.muted { color: var(--muted); font-weight: 400; }
.small { font-size: 12.5px; }
.dim { opacity: .75; }
.hint { color: var(--muted); font-size: 13px; margin: 12px 0 0; }
.hint.top { margin: -4px 0 16px; line-height: 1.6; }

.row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.row.spread { justify-content: space-between; }

.back {
  font-size: 13.5px;
  color: var(--muted);
  align-self: flex-start;
  padding: 6px 12px 6px 8px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
}
.back:hover { color: var(--text); text-decoration: none; border-color: var(--border-strong); }

.pagefoot {
  padding: 20px 32px 28px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 12.5px;
  color: var(--muted);
}

/* ═══════════════════════════════════════════════════ 타일 */

.tiles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(200px, 100%), 1fr));
  gap: 14px;
}

.tile {
  --accent: var(--brand);
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  padding: 38px 20px 18px;          /* 위쪽 색 점 자리 */
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  color: var(--text);
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-height: 112px;
  justify-content: flex-end;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease);
}
.tile::before {
  content: "";
  position: absolute;
  top: 16px; left: 20px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--accent) 16%, transparent);
}
.tile::after {
  content: "";
  position: absolute;
  right: -40px; top: -40px;
  width: 120px; height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent) 14%, transparent), transparent 70%);
}
.tile b { font-size: 28px; font-weight: 800; line-height: 1.15; letter-spacing: -.8px; }
.tile span { font-size: 13px; font-weight: 600; color: var(--text-2); }
.tile small { font-size: 11.5px; color: var(--muted); }

.tile.c1 { --accent: #4f46e5; }
.tile.c2 { --accent: #e5604a; }
.tile.c3 { --accent: #0f9d7a; }
.tile.c4 { --accent: #0ea5e9; }

a.tile:hover { text-decoration: none; transform: translateY(-2px); box-shadow: var(--shadow); }

/* ═══════════════════════════════════════════════════ 폼 */

label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; }
label > span { color: var(--text-2); font-weight: 600; font-size: 13px; }
label > span small { font-weight: 400; color: var(--muted); }

label.check { flex-direction: row; align-items: center; gap: 8px; cursor: pointer; }
label.check > span { color: var(--text); font-weight: 500; font-size: 13.5px; }

input, select, textarea {
  font: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 10px 13px;
  width: 100%;
  transition: border-color .15s var(--ease), box-shadow .15s var(--ease);
}
input::placeholder, textarea::placeholder { color: var(--muted); opacity: .8; }
input[type=checkbox] { width: 16px; height: 16px; accent-color: var(--brand); }
textarea { resize: vertical; }
input[name="end_date"], select { cursor: pointer; }

input:hover, select:hover, textarea:hover { border-color: color-mix(in srgb, var(--brand) 35%, var(--border-strong)); }
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 4px var(--brand-ring);
}
input:disabled, textarea:disabled { background: var(--surface-2); color: var(--muted); }

button, .btn {
  font: inherit;
  font-weight: 650;
  font-size: 14px;
  color: #fff;
  background: var(--brand);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 10px 18px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  box-shadow: 0 1px 2px rgba(16, 24, 48, .12), inset 0 1px 0 rgba(255, 255, 255, .12);
  transition: background .15s var(--ease), transform .1s var(--ease), box-shadow .15s var(--ease);
}
button:hover, .btn:hover { background: var(--brand-dark); text-decoration: none; }
button:active { transform: translateY(1px); }
button:disabled { opacity: .5; cursor: not-allowed; transform: none; }

button.ghost {
  background: var(--surface);
  color: var(--text-2);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}
button.ghost:hover { background: var(--surface-2); color: var(--text); }
button.small { padding: 6px 12px; font-size: 13px; border-radius: 8px; }

.filters {
  display: grid;
  grid-template-columns: 1fr 200px auto;
  gap: 16px;
  align-items: end;
}
.filters label.check { padding-bottom: 11px; }

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px;
}

.auth-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(320px, 100%), 1fr));
  align-items: start;
  gap: 20px;
  max-width: 800px;
}

/* ═══════════════════════════════════════════════════ 태그 */

.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11.5px;
  font-weight: 700;
  line-height: 1;
  padding: 5px 9px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-dark);
  white-space: nowrap;
}
.tag.ok    { background: var(--ok-soft);   color: var(--ok); }
.tag.warn  { background: var(--warn-soft); color: var(--warn); }
.tag.plain { background: transparent; color: var(--muted); box-shadow: inset 0 0 0 1px var(--border-strong); }
.tag.kind-contest   { background: var(--k-contest-soft); color: var(--k-contest); }
.tag.kind-hackathon { background: var(--k-hack-soft);    color: var(--k-hack); }
.tag.kind-etc       { background: var(--k-etc-soft);     color: var(--k-etc); }

.tag-list { display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0 0; }
.ttag {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-2);
  padding: 3px 9px;
  border-radius: 7px;
  background: var(--surface-2);
  border: 1px solid var(--border);
}

/* ═══════════════════════════════════════════════════ 목록 */

.items { display: flex; flex-direction: column; }

.items.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(320px, 100%), 1fr));
  gap: 14px;
}
.items.cards > * { min-width: 0; }

.item {
  display: flex;
  flex-direction: column;
  padding: 18px 20px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), border-color .18s var(--ease);
}
.items:not(.cards) .item { border-radius: 0; border-width: 1px 0 0; padding: 16px 4px; }
.items:not(.cards) .item:first-child { border-top: none; }

.item:hover {
  text-decoration: none;
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--brand) 30%, var(--border));
  box-shadow: var(--shadow);
}
.item:hover h3 { color: var(--brand); }

.item-top { display: flex; align-items: center; gap: 6px; margin-bottom: 10px; flex-wrap: wrap; }
.item h3 {
  margin: 0;
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -.25px;
  transition: color .15s var(--ease);
}
/* 요약은 최대 2줄까지만 보이고 넘치면 … 처리 (-webkit-line-clamp, 주요 브라우저 모두 지원) */
.item-summary {
  margin: 8px 0 0;
  font-size: 13.5px;
  color: var(--text-2);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.item-summary.excerpt { color: var(--muted); font-size: 13px; }
.item-meta {
  display: flex;
  gap: 4px 12px;
  flex-wrap: wrap;
  font-size: 12.5px;
  color: var(--muted);
  margin-top: auto;
  padding-top: 12px;
}
.item-meta span + span::before { content: "·"; margin-right: 12px; opacity: .6; }
.item-depts {
  margin-top: 8px;
  font-size: 12px;
  color: var(--muted);
  padding-top: 10px;
  border-top: 1px dashed var(--border);
}

.empty { color: var(--muted); padding: 36px 10px; text-align: center; font-size: 14px; grid-column: 1 / -1; margin: 0; }
.empty.small { padding: 18px 10px; font-size: 13.5px; }

/* 불러오는 동안 보여주는 자리 */
/* 회색 막대 위로 밝은 띠가 흐르는 효과: 3배 넓은 그라데이션 배경을 shimmer 애니메이션으로 옆으로 민다 */
.skeleton {
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.skeleton i {
  display: block;
  height: 12px;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--surface-2) 25%, var(--border) 50%, var(--surface-2) 75%);
  background-size: 300% 100%;
  animation: shimmer 1.3s infinite linear;
}
.skeleton i:nth-child(1) { width: 30%; }
.skeleton i:nth-child(2) { width: 85%; height: 16px; }
.skeleton i:nth-child(3) { width: 60%; }
.sk-reco { min-height: 150px; }
@keyframes shimmer { from { background-position: 100% 0; } to { background-position: -200% 0; } }

/* ═══════════════════════════════════════════════════ AI 공통 */

.ai-badge {
  display: inline-grid;
  place-items: center;
  flex-shrink: 0;
  width: 28px; height: 28px;
  border-radius: 9px;
  background: var(--ai-grad);
  color: #fff;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .04em;
  box-shadow: 0 4px 14px -4px color-mix(in srgb, var(--ai-1) 70%, transparent);
}
.ai-badge.lg { width: 44px; height: 44px; border-radius: 13px; font-size: 14px; }

.ai-mini {
  display: inline-block;
  vertical-align: 1px;
  font-size: 9.5px;
  font-weight: 800;
  padding: 2px 5px;
  border-radius: 5px;
  color: #fff;
  background: var(--ai-grad);
}

.bar {
  height: 6px;
  border-radius: 999px;
  background: var(--surface-2);
  box-shadow: inset 0 0 0 1px var(--border);
  overflow: hidden;
}
.bar i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--ai-grad);
  transition: width .5s var(--ease);
}
.bar.lg { height: 10px; margin: 8px 0 6px; }

/* ═══════════════════════════════════════════════════ AI 추천 */

.reco {
  position: relative;
  border-radius: var(--radius);
  padding: 22px 24px 24px;
  background:
    radial-gradient(80% 140% at 0% 0%, color-mix(in srgb, var(--ai-1) 10%, transparent), transparent 60%),
    radial-gradient(60% 140% at 100% 0%, color-mix(in srgb, var(--ai-2) 10%, transparent), transparent 60%),
    var(--surface);
  border: 1px solid color-mix(in srgb, var(--ai-1) 22%, var(--border));
  box-shadow: var(--shadow);
}

.reco-head { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.reco-head h2 { margin: 0; font-size: 17px; font-weight: 750; letter-spacing: -.3px; }
.reco-head p { margin: 2px 0 0; font-size: 13px; }
.reco-head .more { margin-left: auto; font-size: 13.5px; font-weight: 600; white-space: nowrap; }

.reco-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
}
.reco-page .reco-grid { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }

.reco-card {
  display: flex;
  flex-direction: column;
  padding: 16px 18px 18px;
  border-radius: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), border-color .18s var(--ease);
}
.reco-card:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: color-mix(in srgb, var(--ai-1) 35%, var(--border));
}
.reco-card-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 8px; }
.reco-card-head .item-top { margin: 4px 0 0; }
.reco-card h3 { margin: 10px 0 0; font-size: 15px; font-weight: 700; line-height: 1.45; letter-spacing: -.2px; }
.reco-why {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-2);
  padding: 9px 11px;
  border-radius: 10px;
  background: var(--ai-soft);
}
.reco-why .spark {
  margin-right: 6px;
  background: var(--ai-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 800;
}

.score-ring {
  --p: 0;
  flex-shrink: 0;
  width: 46px; height: 46px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  /* 원형 게이지 원리 (두 겹의 배경)
   *   아래층 conic-gradient: 12시 방향부터 시계방향으로 --p% 까지 그라데이션, 나머지는 회색
   *   위층 radial-gradient : 가운데를 카드색으로 덮어 도넛 모양만 남긴다
   * app.js 의 scoreRing() 이 --p 에 점수(0~100)를 넣는다. */
  background:
    radial-gradient(closest-side, var(--surface) 76%, transparent 78%),
    conic-gradient(var(--ai-1), var(--ai-2) calc(var(--p) * 1%), var(--surface-2) 0);
  box-shadow: inset 0 0 0 1px var(--border);
}
.score-ring b { font-size: 13.5px; font-weight: 800; letter-spacing: -.3px; }

/* 자체 모델 결과 */
.reco-terms {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  padding: 9px 11px;
  border-radius: 10px;
  background: var(--ai-soft);
  font-size: 12.5px;
}
.reco-terms .spark {
  background: var(--ai-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 800;
}
.reco-terms .muted { margin-right: 2px; }
.ttag.hit {
  background: var(--surface);
  border-color: color-mix(in srgb, var(--ai-1) 30%, var(--border));
  color: var(--text);
  font-weight: 600;
}

.reco-controls {
  display: flex;
  align-items: flex-end;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.reco-controls label { width: min(340px, 100%); }
.model-line { margin: 0 0 11px; font-size: 12.5px; color: var(--muted); }

.reco-groups { display: flex; flex-direction: column; gap: 22px; }
.tier-head { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.tier-head h3 { margin: 0; font-size: 15px; font-weight: 750; }
.tier-count {
  font-size: 11.5px;
  font-weight: 800;
  min-width: 22px;
  padding: 2px 7px;
  border-radius: 999px;
  text-align: center;
  color: #fff;
  background: var(--ai-grad);
}

.model-card summary { cursor: pointer; font-weight: 700; font-size: 14.5px; }
.model-card[open] summary { margin-bottom: 10px; }
.model-card ol { margin: 0; padding-left: 20px; display: flex; flex-direction: column; gap: 8px; font-size: 14px; color: var(--text-2); line-height: 1.65; }
.model-card b { color: var(--text); }

.ml-card {
  border-color: color-mix(in srgb, var(--ai-2) 22%, var(--border));
}
.ml-depts { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(220px, 100%), 1fr)); gap: 10px; }
.ml-dept {
  display: block;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  transition: transform .18s var(--ease), border-color .18s var(--ease), box-shadow .18s var(--ease);
}
.ml-dept:hover { text-decoration: none; transform: translateY(-2px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--ai-1) 35%, var(--border)); }
.ml-dept.me { border-color: var(--ok); box-shadow: 0 0 0 3px var(--ok-soft); }
.tag-list.tight { margin-top: 8px; gap: 4px; }
.tag-list.tight .ttag { font-size: 11.5px; padding: 2px 7px; }

.reco-cta {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}
.reco-cta h2 { margin: 0; font-size: 17px; font-weight: 750; letter-spacing: -.3px; }
.reco-cta p { margin: 3px 0 0; color: var(--muted); font-size: 13.5px; }
.reco-cta > div { flex: 1; min-width: 220px; }
.reco-cta .btn { background: var(--ai-grad); border-radius: 999px; padding: 10px 20px; }
.reco-cta .btn:hover { filter: brightness(1.06); }

/* ═══════════════════════════════════════════════════ 상세 */

.post-head { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }
.post-head h2 { margin: 0; font-size: 22px; font-weight: 800; line-height: 1.4; letter-spacing: -.6px; }

.meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  margin: 20px 0;
  border-radius: 12px;
  overflow: hidden;
  background: var(--border);
  border: 1px solid var(--border);
}
.meta > div { background: var(--surface-2); padding: 12px 16px; }
.meta dt { font-size: 11.5px; color: var(--muted); font-weight: 600; letter-spacing: .02em; }
.meta dd { margin: 3px 0 0; font-size: 14px; font-weight: 600; }

.body {
  white-space: pre-wrap;
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-2);
}
.source { font-size: 14px; margin: 0; word-break: break-all; }
.source a {
  display: inline-flex;
  font-weight: 600;
  padding: 7px 13px;
  border-radius: 999px;
  background: var(--brand-soft);
}
.source a:hover { text-decoration: none; filter: brightness(.97); }

.depts { margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--border); }
.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  font-size: 13px;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-2);
}
.chip.me { border-color: var(--brand); background: var(--brand-soft); color: var(--brand-dark); font-weight: 700; }

/* AI 분석 카드 */
.ai-card {
  border-color: color-mix(in srgb, var(--ai-1) 22%, var(--border));
  background:
    radial-gradient(60% 100% at 100% 0%, color-mix(in srgb, var(--ai-2) 8%, transparent), transparent 70%),
    var(--surface);
}
.ai-summary {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--ai-soft);
  border-left: 3px solid var(--ai-1);
}
.ai-sub { margin: 20px 0 10px; font-size: 13px; color: var(--muted); font-weight: 700; letter-spacing: .02em; }
.ai-depts { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 10px; }
.ai-dept {
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
}
.ai-dept.me { border-color: var(--ok); box-shadow: 0 0 0 3px var(--ok-soft); }
.ai-dept-head { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.ai-dept-head strong { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; }
.ai-dept-head .ai-score { margin-left: auto; font-size: 15px; font-weight: 800; }
.ai-reason { margin: 8px 0 0; font-size: 13px; color: var(--text-2); line-height: 1.55; }

.ai-status { margin-bottom: 14px; }
.ai-status p { margin: 4px 0 0; }

/* ═══════════════════════════════════════════════════ 댓글 */

.comments { display: flex; flex-direction: column; gap: 4px; margin-bottom: 18px; }

.comment { display: flex; flex-direction: column; padding: 12px 14px; border-radius: 12px; background: var(--surface-2); }
.comment-head { display: flex; align-items: center; gap: 9px; font-size: 12.5px; color: var(--muted); }
.comment-head strong { color: var(--text); font-size: 13.5px; }
.comment-head button { margin-left: auto; }
.comment-body { margin: 5px 0 0; white-space: pre-wrap; font-size: 14.5px; }

.comment-form { display: flex; flex-direction: column; gap: 11px; }
.reason { margin: 0; font-size: 13px; color: var(--muted); }
.reason.blocked { color: var(--warn); font-weight: 600; }

/* ═══════════════════════════════════════════════════ 관리자 */

.notice { border-top: 1px solid var(--border); padding: 16px 4px; }
.notice:first-child { border-top: none; padding-top: 2px; }
.notice-top { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 7px; }
.notice h4 { margin: 0 0 10px; font-size: 15px; font-weight: 600; line-height: 1.45; }

.deptbox {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  margin: 0;
  background: var(--surface-2);
}
.deptbox legend { font-size: 12.5px; color: var(--muted); font-weight: 700; padding: 0 6px; }
.deptbox legend small { font-weight: 400; }

/* 관리자 글쓰기: 실시간 학과 적합 확률 */
.predict-box {
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid color-mix(in srgb, var(--ai-1) 22%, var(--border));
  background:
    radial-gradient(60% 120% at 100% 0%, color-mix(in srgb, var(--ai-2) 8%, transparent), transparent 70%),
    var(--surface);
  transition: opacity .2s;
}
.predict-box.busy .predict-list { opacity: .55; }
.predict-head { display: flex; align-items: flex-start; gap: 10px; }
.predict-head > div { flex: 1; min-width: 0; }
.predict-head strong { font-size: 14px; }
.predict-head small { font-weight: 400; margin-left: 4px; }
.predict-head p { margin: 2px 0 0; }
.predict-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px;
  transition: opacity .2s;
}
.predict-list:not(:empty) { margin-top: 12px; }
.predict-row {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 6px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.predict-row:hover { border-color: color-mix(in srgb, var(--ai-1) 40%, var(--border)); }
.predict-row.on { border-color: var(--ok); box-shadow: 0 0 0 3px var(--ok-soft); }
.predict-row-head { display: flex; align-items: baseline; gap: 6px; min-width: 0; }
.predict-row-head strong { font-size: 13.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.predict-row-head .muted { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.predict-prob { margin-left: auto; font-size: 15px; font-variant-numeric: tabular-nums; }
.predict-terms { font-size: 12px; color: var(--muted); }

.dept-grid { display: flex; flex-direction: column; gap: 13px; }
.dept-college > strong { display: block; font-size: 12px; color: var(--muted); margin-bottom: 5px; }
.dept-college .opts { display: flex; gap: 8px 16px; flex-wrap: wrap; }
.dept-college label { flex-direction: row; align-items: center; gap: 6px; }
.dept-college label > span { color: var(--text); font-weight: 400; font-size: 13.5px; }

.dept-editor {
  margin-top: 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  background: var(--surface-2);
}
.dept-editor summary { cursor: pointer; font-size: 13px; font-weight: 700; color: var(--brand); }
.dept-editor[open] summary { margin-bottom: 13px; }
.dept-editor .row { margin-top: 13px; }

/* ═══════════════════════════════════════════════════ 토스트 */

/* 화면 아래 가운데 고정. left 50% + translateX(-50%) = 자기 폭에 상관없이 정확히 가운데 */
.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  background: #141826;
  color: #fff;
  padding: 11px 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  z-index: 60;
  max-width: 90vw;
  box-shadow: 0 10px 30px -6px rgba(0, 0, 0, .35);
  animation: toast-in .25s var(--ease);
}
@keyframes toast-in { from { opacity: 0; transform: translate(-50%, 8px); } }

/* 좁은 화면에서 사이드바를 열면 뒤를 덮는 반투명 막 (inset: 0 = 화면 전체). z-index 는 사이드바보다 아래 */
.scrim {
  position: fixed;
  inset: 0;
  background: rgba(8, 12, 24, .55);
  backdrop-filter: blur(2px);
  z-index: 35;
}

/* ═══════════════════════════════════════════════════ 관심 키워드 선택기 */

.picker-box {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px 14px;
  margin: 0;
  background: var(--surface-2);
}
.picker-box legend { font-size: 13px; font-weight: 700; color: var(--text-2); padding: 0 6px; }
.picker-box legend small { font-weight: 500; color: var(--muted); margin-left: 4px; }
.picker-box legend small.warn { color: var(--warn); }
.pick-group + .pick-group { margin-top: 10px; }
.pick-group > strong { display: block; font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.picks { display: flex; flex-wrap: wrap; gap: 6px; }
button.pick {
  font-size: 13px;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 999px;
  color: var(--text-2);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  box-shadow: none;
}
button.pick:hover { background: var(--brand-soft); color: var(--brand-dark); }
button.pick.on {
  color: #fff;
  background: var(--brand);
  border-color: var(--brand);
  font-weight: 650;
}
button.pick.on::before { content: "✓ "; }

/* ═══════════════════════════════════════════════════ 팀원 모집 */

.btn.small { padding: 7px 13px; font-size: 13px; }
.card-head > .btn { margin-left: auto; }
.filters.three { grid-template-columns: 1fr 160px 200px; }

.recruit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(320px, 100%), 1fr));
  gap: 14px;
}
.recruit-card {
  display: flex;
  flex-direction: column;
  padding: 18px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow-sm);
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), border-color .18s var(--ease);
}
.recruit-card:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: color-mix(in srgb, var(--brand) 30%, var(--border));
}
.recruit-card.closed { opacity: .62; }
.recruit-card h3 { margin: 10px 0 0; font-size: 15.5px; font-weight: 700; line-height: 1.45; letter-spacing: -.25px; }
.recruit-post {
  margin: 6px 0 0;
  font-size: 12.5px;
  color: var(--text-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.ttag.want { background: var(--k-hack-soft); border-color: transparent; color: var(--k-hack); font-weight: 600; }

/* 마음에 들어요 */
.recruit-foot {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 10px;
  margin-top: auto;
}
.recruit-foot .item-meta { min-width: 0; }
.like-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  flex: none;
  padding: 4px 11px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.4;
  cursor: pointer;
  transition: color .15s, border-color .15s, background .15s, transform .15s;
}
.like-btn:hover:not(:disabled) { color: var(--like); border-color: color-mix(in srgb, var(--like) 45%, var(--border)); }
.like-btn:active:not(:disabled) { transform: scale(.94); }
.like-btn:disabled { cursor: default; opacity: .7; }
.like-btn .heart { font-size: 14px; line-height: 1; }
.like-btn.on {
  color: var(--like);
  border-color: color-mix(in srgb, var(--like) 40%, transparent);
  background: color-mix(in srgb, var(--like) 10%, var(--surface));
}
.like-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 14px; }
.like-row .muted { margin: 0; }
.person-like { margin: 10px 0 0; font-size: 12.5px; font-weight: 600; color: var(--like); }

.linked-post { margin: 0 0 14px; font-size: 14px; }
.match-box {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--ai-soft);
}
.match-box p { margin: 2px 0 0; }
.owner-actions { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--border); }
button.danger { color: var(--danger); }

.mini-list { display: flex; flex-direction: column; gap: 6px; }
.mini-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--surface-2);
  color: var(--text);
}
.mini-row:hover { text-decoration: none; background: var(--brand-soft); }
.mini-row strong { font-size: 14px; font-weight: 650; }
.mini-row .muted { margin-left: auto; }

/* ═══════════════════════════════════════════════════ 그룹 스터디 */

.filters.one { grid-template-columns: minmax(0, 240px); }

/* 역할 표시: 멘토 = 초록, 멘티 = 청록, 방장 = 인디고 */
.tag.mentor { background: var(--ok-soft);      color: var(--ok); }
.tag.mentee { background: var(--k-hack-soft);  color: var(--k-hack); }
.tag.owner  { background: var(--brand-soft);   color: var(--brand-dark); }

/* 멘토링 만들기: 내 역할 고르기 (멘토 / 멘티 두 칸 버튼) */
.role-pick {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-2);
}
.role-pick label { position: relative; flex-direction: row; cursor: pointer; }
.role-pick input { position: absolute; opacity: 0; pointer-events: none; }
.role-pick span {
  padding: 7px 16px;
  border-radius: 7px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-2);
}
.role-pick input:checked + span { background: var(--brand); color: #fff; }
.role-pick input:focus-visible + span { outline: 2px solid var(--brand-ring); outline-offset: 1px; }

.study-members { display: flex; flex-direction: column; gap: 18px; }
.study-group-title { margin: 0 0 8px; font-size: 13px; font-weight: 700; color: var(--text-2); }
.study-member {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--surface-2);
}
.study-member + .study-member { margin-top: 6px; }
.study-member .avatar { box-shadow: none; }
.study-member .person-who { flex: 1; }
.study-member-tools { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.study-member-tools select { width: auto; padding: 6px 10px; font-size: 13px; }

.study-search { display: grid; grid-template-columns: 1fr 140px auto; gap: 10px; margin-bottom: 12px; }

/* ═══════════════════════════════════════════════════ 팀원 찾기 */

.my-tags { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin: -4px 0 16px; }
.people-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr));
  gap: 12px;
}
.person-card {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 16px 18px;
  border-radius: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
}
.person-head { display: flex; align-items: center; gap: 12px; }
.avatar.lg { width: 42px; height: 42px; font-size: 16px; box-shadow: none; }
.person-who { display: flex; flex-direction: column; line-height: 1.35; flex: 1; min-width: 0; }
.person-who strong { font-size: 15px; }
.person-why { margin: 10px 0 0; font-size: 12.5px; font-weight: 600; color: var(--ok); }
.person-bio {
  margin: 8px 0 4px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-2);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 가입 폼의 표시 이름 미리보기 */
/* 로그인 · 회원가입 */
.auth-wrap { display: flex; flex-direction: column; align-items: center; padding-top: 12px; }
.auth-card { width: 100%; max-width: 420px; }
.auth-card.wide { max-width: 640px; }
.auth-title { text-align: center; margin-bottom: 18px; }
.auth-title .logo-mark { font-size: 22px; font-weight: 800; color: var(--brand); letter-spacing: -.5px; }
.auth-title h2 { margin: 8px 0 2px; font-size: 20px; }
.auth-title p { margin: 0; }
button.block { width: 100%; padding: 11px 16px; }
.auth-switch { margin: 16px 0 0; text-align: center; font-size: 13px; color: var(--muted); }
.auth-switch a { font-weight: 700; margin-left: 4px; }
.auth-box {
  margin: 0;
  padding: 12px 14px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-2);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.auth-box legend { font-size: 13px; font-weight: 700; color: var(--text-2); padding: 0 6px; }
.auth-box legend small { font-weight: 500; color: var(--danger); margin-left: 4px; }
.auth-box .mt { margin-top: 2px; }
.code-row { display: flex; gap: 8px; align-items: center; }
.code-row input { flex: 1; min-width: 0; }
.code-row button { flex: none; white-space: nowrap; }
.code-row input[name="code"] { letter-spacing: 4px; font-variant-numeric: tabular-nums; font-weight: 700; }
.code-timer { flex: none; min-width: 48px; text-align: right; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--brand); }
.code-timer.over { color: var(--danger); }
.code-timer.done { color: var(--ok); font-size: 18px; min-width: 24px; }
.auth-box.verified { border-color: color-mix(in srgb, var(--ok) 45%, var(--border)); background: var(--ok-soft); }
.auth-box input[readonly] { background: var(--surface); color: var(--text-2); }
.auth-msg { margin: 0; line-height: 1.5; }
.auth-msg.ok { color: var(--ok); }
.auth-msg.warn { color: var(--warn); }
.auth-msg.blocked { color: var(--danger); }
.auth-optional {
  border: 1px dashed var(--border-strong);
  border-radius: 12px;
  padding: 10px 14px;
}
.auth-optional summary { cursor: pointer; font-size: 13.5px; font-weight: 700; color: var(--text-2); }
.auth-optional summary small { font-weight: 400; color: var(--muted); margin-left: 4px; }
.auth-optional[open] { display: flex; flex-direction: column; gap: 12px; }
.auth-optional[open] summary { margin-bottom: 2px; }

.namecard {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  border: 1px dashed var(--border-strong);
  border-radius: 12px;
  background: var(--surface-2);
}
.namecard-label { font-size: 12px; font-weight: 600; color: var(--muted); }
.namecard b { font-size: 19px; font-weight: 800; color: var(--brand-dark); letter-spacing: .3px; }
.namecard-note { font-size: 12px; color: var(--muted); line-height: 1.5; }

/* 화면 전환 시 살짝 떠오르기 */
/* ═══════════════════════════════════════════════════ AI 구조 소개 (#/ai) */

.aa-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
  margin-top: 18px;
}
.aa-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  min-width: 0;
}
.aa-stat span { font-size: 12px; color: var(--muted); }
.aa-stat b { font-size: 14.5px; letter-spacing: -.2px; overflow-wrap: anywhere; }
.aa-stats:not(.off) .aa-stat:first-child b {
  background: var(--ai-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.aa-stats.off .aa-stat:first-child b { color: var(--warn); }

/* 구조도: 층마다 아래로 화살표 */
.aa-flow { display: flex; flex-direction: column; gap: 26px; }
.aa-layer { position: relative; }
.aa-layer + .aa-layer::before {
  content: "";
  position: absolute;
  top: -21px;
  left: 50%;
  width: 2px;
  height: 14px;
  background: color-mix(in srgb, var(--ai-1) 45%, var(--border));
}
.aa-layer + .aa-layer::after {
  content: "";
  position: absolute;
  top: -9px;
  left: calc(50% - 4px);
  border: 5px solid transparent;
  border-top-color: color-mix(in srgb, var(--ai-1) 60%, var(--border));
}
.aa-lt { margin: 0 0 8px; font-size: 12.5px; font-weight: 700; color: var(--muted); letter-spacing: .02em; }
.aa-boxes { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 10px; }
.aa-boxes.one { grid-template-columns: 1fr; }
.aa-box {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  min-width: 0;
}
.aa-box b { font-size: 14px; }
.aa-box span { font-size: 12.5px; color: var(--text-2); line-height: 1.55; }
.aa-box.sig { border-color: color-mix(in srgb, var(--like) 35%, var(--border)); background: color-mix(in srgb, var(--like) 6%, var(--surface)); }
.aa-box.wide b { font-size: 14.5px; }
.aa-box.out { background: var(--ai-soft); border-color: color-mix(in srgb, var(--ai-1) 25%, var(--border)); transition: transform .15s var(--ease), box-shadow .15s; }
.aa-box.out:hover { text-decoration: none; transform: translateY(-2px); box-shadow: var(--shadow); }

.aa-split { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.aa-branch { padding: 14px 16px; border-radius: 12px; border: 1px solid var(--border); background: var(--surface); }
.aa-branch.tfidf { border-top: 3px solid var(--ai-2); }
.aa-branch.emb { border-top: 3px solid var(--ai-1); }
.aa-bt { margin: 0 0 8px; font-weight: 700; font-size: 14.5px; }
.aa-bt em { font-style: normal; margin-left: 6px; padding: 1px 8px; border-radius: 999px; font-size: 12px; background: var(--ai-soft); color: var(--ai-1); }
.aa-branch ol { margin: 0; padding-left: 18px; display: flex; flex-direction: column; gap: 5px; font-size: 13.5px; line-height: 1.55; }
.aa-branch small { display: block; color: var(--muted); font-size: 12px; }
.aa-out { margin: 10px 0 0; font-size: 12.5px; font-weight: 600; color: var(--text-2); }
.aiarch code {
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 12.5px;
  padding: 1px 6px;
  border-radius: 6px;
  background: var(--surface-2);
  border: 1px solid var(--border);
}

.aa-compare { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.aa-compare p:not(.aa-bt) { margin: 0; font-size: 13.5px; line-height: 1.7; color: var(--text-2); }

.aa-formulas { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 10px; }
.aa-f { display: flex; flex-direction: column; gap: 6px; padding: 12px 14px; border-radius: 12px; background: var(--surface-2); min-width: 0; }
.aa-f > span { font-size: 12px; color: var(--muted); font-weight: 600; }
.aa-f code { align-self: flex-start; max-width: 100%; overflow-x: auto; white-space: nowrap; font-size: 13px; background: var(--surface); }
.aa-f small { font-size: 12px; color: var(--muted); }

.aa-sys { display: flex; align-items: stretch; gap: 10px; }
.aa-sys.sub { margin-top: 10px; display: grid; grid-template-columns: 1fr 1fr; }
.aa-node { flex: 1; display: flex; flex-direction: column; gap: 4px; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--border); background: var(--surface-2); min-width: 0; }
.aa-node b { font-size: 14px; }
.aa-node span { font-size: 12.5px; color: var(--text-2); }
.aa-node.main { border-color: color-mix(in srgb, var(--ai-1) 35%, var(--border)); background: var(--ai-soft); }
.aa-arrow { align-self: center; color: var(--muted); font-size: 18px; }
.aa-notes { margin: 16px 0 0; padding-left: 18px; display: flex; flex-direction: column; gap: 6px; font-size: 13.5px; line-height: 1.65; color: var(--text-2); }
.aa-notes b { color: var(--text); }

/* 화면이 바뀔 때마다 새 내용이 6px 아래에서 살짝 떠오르며 나타난다 */
#view > * { animation: rise .28s var(--ease); }
@keyframes rise { from { opacity: 0; transform: translateY(6px); } }

/* 운영체제에서 "동작 줄이기" 를 켠 사용자(어지럼증 등)에게는 모든 애니메이션을 끈다 - 접근성 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ═══════════════════════════════════════════════════ 좁은 화면 */

/* 태블릿 이하: 사이드바를 화면 왼쪽 밖으로 밀어 두고(translateX(-100%)), .open 이 붙으면 들어온다.
 * 본문은 사이드바 자리만큼 띄우던 여백을 없애고, 필터는 한 줄에 하나씩 */
@media (max-width: 960px) {
  .sidebar { transform: translateX(-100%); transition: transform .22s var(--ease); }
  .sidebar.open { transform: none; box-shadow: var(--shadow-lg); }
  .shell { margin-left: 0; }
  .hamburger { display: block; }
  .filters, .filters.three { grid-template-columns: 1fr; }
  .filters label.check { padding-bottom: 0; }
}

/* 휴대폰: 여백을 줄이고 카드 격자를 한 줄 한 개로, 긴 제목은 … 로 자른다 */
@media (max-width: 640px) {
  .topbar { padding: 0 16px; }
  .tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .tile { padding: 34px 14px 14px; min-height: 100px; }
  .tile b { font-size: 24px; }
  .page-title { font-size: 15px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .topbar-right > a { padding: 6px 12px; font-size: 13px; white-space: nowrap; }
  .hero { margin: 16px 16px 0; padding: 26px 20px 28px; border-radius: 18px; }
  .hero h2 { font-size: 23px; }
  main { padding: 18px 16px 44px; }
  .pagefoot { padding: 16px; }
  .card, .reco { padding: 18px; }
  .whoami { display: none; }
  .items.cards, .reco-grid, .reco-page .reco-grid, .ai-depts { grid-template-columns: 1fr; }
  .auth-grid { grid-template-columns: 1fr; }
  .reco-head { flex-wrap: wrap; }
  .aa-split, .aa-compare, .aa-sys.sub { grid-template-columns: 1fr; }
  .aa-sys { flex-direction: column; }
  .aa-arrow { transform: rotate(90deg); }
  .study-search { grid-template-columns: 1fr; }
  .study-member-tools { margin-left: 0; width: 100%; }
}