/* =============================================================
   공통 스타일 — 모든 페이지 (index, admin, 과목 페이지)
   흰 배경 고정 · 한글은 단어 중간에서 줄바꿈하지 않음(keep-all)
   ============================================================= */

/* ---------- 색 · 글꼴 ---------- */
:root {
  color-scheme: light;
  --bg: #ffffff;
  --ink: #0f1a2b; /* 기본 글자 */
  --muted: #5a6678; /* 흐린 글자 */
  --line: #e3e9f0; /* 테두리 */
  --soft: #f2f6fa; /* 연한 배경 */
  --sky: #1ea7e4; /* 메인 파랑 */
  --sky-d: #0e86c2;
  --sky-soft: #e3f4fc;
  --mint: #5fd3c0;
  --ok: #1f8a5b;
  --warn: #b26a00;
  --bad: #d2402f;
  --f-head: "Noto Sans KR", system-ui, -apple-system, sans-serif;
  --f-body: "Noto Sans KR", system-ui, -apple-system, sans-serif;
  --f-logo: "Montserrat", "Noto Sans KR", sans-serif;
}

/* ---------- 기본 ---------- */
* {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-tap-highlight-color: transparent;
  word-break: keep-all;
  overflow-wrap: break-word;
}
p,
li {
  text-wrap: pretty;
}
h1,
h2,
h3 {
  margin: 0;
  text-wrap: balance;
}
a {
  color: inherit;
}
button,
input {
  font: inherit;
  color: inherit;
}
button {
  cursor: pointer;
}
:focus-visible {
  outline: 3px solid var(--sky);
  outline-offset: 2px;
}
[hidden] {
  display: none !important;
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

/* 가운데 정렬 상자 (양옆 여백 + 아이폰 노치 여백) */
.inner {
  max-width: 1120px;
  margin: 0 auto;
  padding-left: max(20px, env(safe-area-inset-left, 0px));
  padding-right: max(20px, env(safe-area-inset-right, 0px));
}

/* ---------- 상단 바 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.86);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid transparent;
  padding-top: env(safe-area-inset-top, 0px);
}
.nav.scrolled {
  border-bottom-color: var(--line);
}
.nav .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  height: 64px;
}
.nav-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  min-width: 0;
}
.nav-actions .btn {
  padding: 9px 14px;
}

/* 로고: MSP | MY STUDY PLAN */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: none;
  white-space: nowrap;
  text-decoration: none;
  font-family: var(--f-head);
  font-weight: 900;
  font-size: 21px;
  color: var(--sky);
  letter-spacing: -0.02em;
}
.msp {
  font-family: var(--f-logo);
  font-weight: 800;
  font-size: 28px;
  line-height: 1;
  letter-spacing: 0.01em;
  color: #1d8fe0;
}
.lname {
  font-family: var(--f-logo);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.08em;
  line-height: 1.1;
  color: var(--ink);
  padding-left: 10px;
  border-left: 2px solid var(--line);
}

/* 로그인한 사람 이름 + 로그아웃 */
.who {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  background: var(--soft);
  border-radius: 12px;
  padding: 6px 6px 6px 12px;
  font-size: 14px;
  font-weight: 700;
}
.who span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.who button {
  border: none;
  background: #fff;
  border-radius: 9px;
  padding: 5px 10px;
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
  white-space: nowrap;
}

/* ---------- 버튼 ---------- */
.btn {
  border: none;
  border-radius: 12px;
  padding: 10px 16px;
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  white-space: nowrap;
}
.btn-sky {
  background: var(--sky);
  color: #fff;
}
.btn-sky:hover {
  background: var(--sky-d);
}
.btn-mint {
  background: #13a89e;
  color: #fff;
}
.btn-mint:hover {
  background: #0e8a82;
}
.btn-soft {
  background: var(--soft);
  color: var(--ink);
}
.btn-dark {
  background: var(--ink);
  color: #fff;
}

/* ---------- 흰 카드 · 입력칸 ---------- */
.card {
  min-width: 0;
  background: #fff;
  border-radius: 22px;
  box-shadow:
    0 20px 50px rgba(15, 26, 43, 0.1),
    0 2px 6px rgba(15, 26, 43, 0.05);
  padding: 22px 24px;
}
.card .btn-sky {
  width: 100%;
  padding: 15px;
  font-size: 17px;
  border-radius: 14px;
}
.card .btn-sky[disabled] {
  background: #b9d9ea;
  cursor: not-allowed;
}
.field {
  display: grid;
  gap: 6px;
  margin-bottom: 12px;
}
.field label {
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
}
.field input {
  width: 100%;
  border: 2px solid var(--line);
  border-radius: 14px;
  padding: 13px 14px;
  font-size: 18px;
  background: #fff;
  color: var(--ink);
}
.field input:focus {
  border-color: var(--sky);
  outline: none;
}
.err {
  color: var(--bad);
  font-size: 14px;
  font-weight: 700;
  min-height: 1.4em;
  margin: 2px 0 10px;
}
.note {
  margin: 12px 0 0;
  font-size: 12px;
  color: var(--muted);
}

/* 과목 아이콘 (첫 화면 카드 · 과목 페이지 공통) */
.glyph {
  width: 54px;
  height: 54px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  font-weight: 900;
  font-size: 22px;
  background: var(--cs, var(--soft));
  color: var(--c, var(--ink));
}

/* ---------- 휴대폰 ---------- */
@media (max-width: 480px) {
  .nav .inner {
    height: 58px;
  }
  .msp {
    font-size: 24px;
  }
  .lname {
    font-size: 11px;
    letter-spacing: 0.05em;
    padding-left: 8px;
  }
  .who .lab {
    display: none;
  }
}
@media (max-width: 420px) {
  .nav-actions .btn {
    padding: 8px 11px;
    font-size: 14px;
  }
}