@import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable-dynamic-subset.min.css");

/*
 * CoreMate 브랜드 사이트(edu_homepage)의 디자인 토큰을 그대로 옮겨온 값.
 * app/globals.css 의 --color-brand-*, --color-ink-*, radius, 폰트를 참고.
 */
:root {
  --color-brand-50: #eef4ff;
  --color-brand-100: #d9e6ff;
  --color-brand-200: #b7cdff;
  --color-brand-500: #2f5be0;
  --color-brand-600: #1e3fb8;
  --color-brand-700: #163094;
  --color-brand-800: #112572;

  --color-ink-50: #f7f8fa;
  --color-ink-100: #eef0f4;
  --color-ink-200: #dee2ea;
  --color-ink-300: #c2c9d6;
  --color-ink-400: #97a0b4;
  --color-ink-500: #6b7488;
  --color-ink-600: #4b536a;
  --color-ink-700: #353c50;
  --color-ink-800: #1f2538;
  --color-ink-900: #10162a;

  --color-background: #ffffff;
  --color-foreground: var(--color-ink-900);
  --color-muted: var(--color-ink-500);
  --color-border: var(--color-ink-200);

  --font-sans: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont,
    system-ui, "Segoe UI", Roboto, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;

  /* edu_homepage 는 카드류 radius 를 8px 로 통일해두었다(둥근 카드가 가벼워 보인다는 피드백). */
  --radius-card: 0.5rem;
  --max-width: 1280px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

html {
  color-scheme: light;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-sans);
  background: var(--color-background);
  color: var(--color-foreground);
  line-height: 1.6;
  letter-spacing: -0.01em;
  word-break: keep-all;
  overflow-wrap: break-word;
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3 {
  letter-spacing: -0.025em;
  font-weight: 700;
}

::selection {
  background: var(--color-brand-600);
  color: #ffffff;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

@media (min-width: 768px) {
  .container {
    padding: 0 2rem;
  }
}

/* ---------- 공통 상단바 ---------- */
.top-bar {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid transparent;
  background: rgba(255, 255, 255, 0);
  backdrop-filter: blur(8px);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.top-bar.is-scrolled {
  background: rgba(255, 255, 255, 0.85);
  border-bottom-color: var(--color-ink-200);
}

.top-bar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.01em;
  color: var(--color-ink-900);
  white-space: nowrap;
}

.brand img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: block;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink-600);
  white-space: nowrap;
  border-radius: 999px;
  padding: 8px 14px;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.back-link:hover {
  background: var(--color-ink-100);
  color: var(--color-ink-900);
}

/* ---------- 페이지 헤더 ---------- */
.page-header {
  padding: 48px 0 28px;
}

.page-header h1 {
  font-size: 32px;
  margin: 0 0 10px;
  color: var(--color-ink-900);
}

.page-header p {
  color: var(--color-muted);
  margin: 0;
  font-size: 15px;
}

/* ---------- 카드 목록 ---------- */
.card-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-bottom: 56px;
}

.card {
  display: block;
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 22px 24px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.card:hover {
  border-color: var(--color-brand-500);
  box-shadow: 0 8px 30px rgb(16 22 42 / 0.06);
}

.card-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-ink-900);
  margin: 0 0 6px;
}

.card-desc {
  font-size: 14px;
  color: var(--color-ink-600);
  margin: 0 0 12px;
}

.card-meta {
  font-size: 13px;
  color: var(--color-muted);
  font-weight: 500;
}

.card-info {
  font-size: 13px;
  color: var(--color-ink-600);
  margin: 2px 0;
}

.page-header .card-info {
  color: var(--color-ink-600);
}

.badge {
  display: inline-flex;
  align-items: center;
  background: var(--color-brand-50);
  color: var(--color-brand-800);
  border: 1px solid var(--color-brand-200);
  border-radius: 999px;
  padding: 3px 11px;
  font-size: 12px;
  font-weight: 600;
  margin-right: 8px;
}

.card-disabled {
  cursor: default;
  background: var(--color-ink-50);
}

.card-disabled:hover {
  border-color: var(--color-border);
  box-shadow: none;
}

.card-disabled .card-title {
  color: var(--color-ink-500);
}

.badge-muted {
  background: var(--color-ink-100);
  color: var(--color-ink-600);
  border-color: var(--color-ink-200);
}

.badge-soon {
  background: var(--color-ink-50);
  color: var(--color-ink-500);
  border-color: var(--color-ink-200);
}

.empty-state {
  padding: 48px 0;
  color: var(--color-muted);
  text-align: center;
  font-size: 14px;
}

/* ---------- 교안 뷰어 ---------- */
.viewer-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  height: 64px;
  flex-wrap: nowrap;
}

.viewer-title {
  flex: 1;
  min-width: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink-800);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: center;
}

.nav-buttons {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.nav-btn {
  border: 1px solid var(--color-border);
  background: var(--color-background);
  border-radius: 999px;
  padding: 9px 16px;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  color: var(--color-ink-700);
  white-space: nowrap;
  transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
}

.nav-btn:hover:not(:disabled) {
  border-color: var(--color-brand-500);
  color: var(--color-brand-700);
  background: var(--color-brand-50);
}

.nav-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.viewer-frame-wrap {
  height: calc(100vh - 64px);
  width: 100%;
  overflow: hidden;
  background: var(--color-ink-50);
}

#lesson-frame {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}

@media (max-width: 640px) {
  .viewer-title {
    display: none;
  }

  .brand span {
    display: none;
  }
}