/*
 * common.css — 로망아바타 모바일/데스크탑 공통 스타일
 * ref: https://developer.mozilla.org/en-US/docs/Web/CSS
 * ref: https://www.w3.org/WAI/WCAG21/quickref/ (접근성)
 * UTF-8 without BOM | LF line endings
 */

/* ── CSS 변수 (공통) */
:root {
  /* 색상 */
  --color-bg:          #0f0f0f;
  --color-bg-2:        #181818;
  --color-primary:     #ff0000;
  --color-primary-dark:#cc0000;
  --color-text:        #c8d8e8;
  --color-text-muted:  #8898aa;
  --color-text-dim:    #6b7c93;
  --color-border:      rgba(255,0,0, 0.12);
  --color-border-hover:rgba(255,0,0, 0.35);
  --color-success:     #68d391;
  --color-danger:      #fc8181;
  --color-live:        #e53e3e;

  /* 타이포그래피 */
  --font-base: 'SchoolSafetyTteokbokki', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs:  0.75rem;
  --font-size-sm:  0.875rem;
  --font-size-md:  1rem;
  --font-size-lg:  1.125rem;
  --font-size-xl:  1.25rem;
  --font-size-2xl: 1.5rem;

  /* 간격 */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* 반경 */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;
  --radius-xl:  16px;
  --radius-full: 9999px;

  /* 전환 */
  --transition-fast:   0.15s ease;
  --transition-base:   0.25s ease;
  --transition-slow:   0.4s ease;

  /* 레이아웃 */
  --max-width: 1200px;
  --header-height: 64px;
}

/* ── 다크 모드 대응
 * ref: https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme
 */
@media (prefers-color-scheme: light) {
  :root {
    --color-bg:         #f8fafc;
    --color-bg-2:       #ffffff;
    --color-text:       #1a2332;
    --color-text-muted: #4a5568;
    --color-text-dim:   #718096;
  }
}

/* ── 폰트 */
@font-face {
  font-family: 'SchoolSafetyTteokbokki';
  src: url('https://cdn.jsdelivr.net/gh/projectnoonnu/2510-1@1.0/HakgyoansimTTeokbokkiB.woff2') format('woff2');
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

/* ── 기본 body */
body {
  font-family: var(--font-base);
  background: var(--color-bg);
  color: var(--color-text);
  overflow-x: hidden;
}

/* ── 접근성: 본문 바로가기
 * ref: https://www.w3.org/WAI/WCAG21/Techniques/general/G1
 */
.skip-to-main {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-primary);
  color: var(--color-bg);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 700;
  z-index: 9999;
  text-decoration: none;
  transition: top var(--transition-fast);
}
.skip-to-main:focus {
  top: var(--space-4);
}

/* ── 공통 컨테이너 */
.g-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-8);
  width: 100%;
}
@media (max-width: 768px) {
  .g-inner {
    padding: 0 var(--space-4);
  }
}

/* ── 공통 버튼
 * ref: https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Roles/button_role
 */
.g-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.875rem 2rem;
  border-radius: var(--radius-full);
  font-family: var(--font-base);
  font-size: var(--font-size-md);
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all var(--transition-base);
  min-height: 48px;
  min-width: 48px;
  white-space: nowrap;
}
.g-btn:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
}
.g-btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: var(--color-bg);
  box-shadow: 0 4px 20px rgba(255,0,0, 0.4);
}
.g-btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(255,0,0, 0.6);
}
.g-btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid rgba(255,0,0, 0.5);
}
.g-btn-outline:hover {
  background: rgba(255,0,0, 0.1);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

/* ── 공통 카드 */
.g-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: all var(--transition-base);
}
.g-card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

/* ── LIVE 배지 */
.g-live-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(229, 62, 62, 0.9);
  color: #fff;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 700;
}
.g-live-dot {
  width: 6px;
  height: 6px;
  background: #fff;
  border-radius: 50%;
  animation: g-blink 1.5s ease-in-out infinite;
}

/* ── 태그 배지 */
.g-tag {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  background: rgba(255,0,0, 0.12);
  color: var(--color-primary);
}

/* ── 네비게이션 공통 */
.g-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15,15,15, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,0,0, 0.08);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

/* ── 푸터 공통 */
.g-footer {
  background: #020b14;
  border-top: 1px solid rgba(255,0,0, 0.08);
  padding: var(--space-12) 0 var(--space-8);
  margin-top: auto;
}

/* ── 메뉴 active 처리 */
.g-nav-link {
  position: relative;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  font-weight: 600;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast);
  text-decoration: none;
}
.g-nav-link:hover,
.g-nav-link.active {
  color: var(--color-primary);
}
.g-nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
}

/* ── 페이지 히어로 공통 */
.g-page-hero {
  background: linear-gradient(180deg, #181818 0%, #0f0f0f 100%);
  padding: var(--space-12) 0 var(--space-10);
  border-bottom: 1px solid rgba(255,0,0, 0.08);
}

/* ── 섹션 공통 */
.g-section {
  padding: var(--space-20) 0;
}
.g-section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
  line-height: 1.2;
}
.g-section-sub {
  font-size: var(--font-size-md);
  color: var(--color-text-muted);
  margin-bottom: var(--space-12);
  line-height: 1.7;
}

/* ── 애니메이션 */
@keyframes g-blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.3; }
}
@keyframes g-glow {
  0%, 100% { transform: scale(1); opacity: 0.6; }
  50%       { transform: scale(1.1); opacity: 1; }
}
@keyframes g-fade-in {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── 모션 감소 대응
 * ref: https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-reduced-motion
 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ── 반응형 유틸리티 */
@media (max-width: 768px) {
  .g-hide-mobile { display: none !important; }
}
@media (min-width: 769px) {
  .g-hide-desktop { display: none !important; }
}

/* ── 스크린 리더 전용
 * ref: https://www.w3.org/WAI/WCAG21/Techniques/css/C7
 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}