/* ============================================================
   Stone TD 공식 웹사이트 스타일
   모바일 반응형, 다크 테마, 한국어/영어 토글 지원
   ============================================================ */

/* ─────────── 다국어 전환 (lang.js 제어) ─────────── */
/* 기본: show-ko 클래스가 없으면 ko 표시 (초기 로딩 시 FOUC 방지) */
[data-lang="en"] {
  display: none;
}
[data-lang="ko"] {
  display: initial;
}

/* show-en 상태 */
body.show-en [data-lang="ko"] {
  display: none !important;
}
body.show-en [data-lang="en"] {
  display: initial;
}

/* show-ko 상태 (명시적) */
body.show-ko [data-lang="en"] {
  display: none !important;
}
body.show-ko [data-lang="ko"] {
  display: initial;
}

/* block 요소용 (section, div, p, li 등) */
body.show-en section[data-lang="ko"],
body.show-en div[data-lang="ko"],
body.show-en p[data-lang="ko"],
body.show-en li[data-lang="ko"],
body.show-en h1[data-lang="ko"],
body.show-en h2[data-lang="ko"],
body.show-en h3[data-lang="ko"],
body.show-en ul[data-lang="ko"] {
  display: none !important;
}
body.show-en section[data-lang="en"],
body.show-en div[data-lang="en"],
body.show-en p[data-lang="en"],
body.show-en li[data-lang="en"],
body.show-en h1[data-lang="en"],
body.show-en h2[data-lang="en"],
body.show-en h3[data-lang="en"],
body.show-en ul[data-lang="en"] {
  display: block;
}

body.show-ko section[data-lang="en"],
body.show-ko div[data-lang="en"],
body.show-ko p[data-lang="en"],
body.show-ko li[data-lang="en"],
body.show-ko h1[data-lang="en"],
body.show-ko h2[data-lang="en"],
body.show-ko h3[data-lang="en"],
body.show-ko ul[data-lang="en"] {
  display: none !important;
}
body.show-ko section[data-lang="ko"],
body.show-ko div[data-lang="ko"],
body.show-ko p[data-lang="ko"],
body.show-ko li[data-lang="ko"],
body.show-ko h1[data-lang="ko"],
body.show-ko h2[data-lang="ko"],
body.show-ko h3[data-lang="ko"],
body.show-ko ul[data-lang="ko"] {
  display: block;
}

/* 언어 전환 버튼 */
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 7px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
  margin-left: 8px;
}

.lang-switch:hover {
  background: var(--accent);
  color: #fff5e6;
  border-color: var(--accent);
  box-shadow: 0 0 12px rgba(255, 69, 0, 0.4);
}

.lang-switch:active {
  transform: scale(0.96);
}



:root {
  /* Fire 테마 — Stone TD 아이콘 기반 */
  --bg-primary: #080000;           /* 깊은 흑적색 */
  --bg-secondary: #180505;         /* 어두운 버건디 */
  --bg-card: #241010;              /* 카드 배경 (약간 밝음) */
  --border: #4a1515;               /* 어두운 적색 테두리 */
  --text-primary: #fff5e6;         /* 따뜻한 크림 (본문 흰색) */
  --text-secondary: #d4a574;       /* 따뜻한 금색/탄 */
  --text-muted: #8b5a2b;           /* 어두운 갈색 */
  --accent: #ff4500;               /* 불꽃 주황-빨강 (메인 강조) */
  --accent-hover: #ff6b35;         /* 밝은 불꽃 */
  --accent-gold: #ffb800;          /* 따뜻한 금색 (보조 강조) */
  --accent-dark: #8b1a00;          /* 진한 적색 */
  --danger: #dc2626;
  --success: #10b981;
  --max-width: 880px;
  --radius: 12px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Pretendard",
    "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ─────────── 공통 컨테이너 ─────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
}

/* ─────────── 헤더 / 네비게이션 ─────────── */
header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 20px;
}

.logo-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 0 14px rgba(255, 69, 0, 0.45), 0 0 4px rgba(255, 184, 0, 0.3);
  transition: box-shadow 0.3s ease, transform 0.2s ease;
}

.logo:hover .logo-icon {
  box-shadow: 0 0 20px rgba(255, 69, 0, 0.7), 0 0 8px rgba(255, 184, 0, 0.5);
  transform: scale(1.05);
}

.nav-links {
  display: flex;
  gap: 20px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--accent);
}

/* ─────────── Hero 섹션 (index.html 전용) ─────────── */
.hero {
  padding: 80px 0 60px;
  text-align: center;
  background: linear-gradient(
    180deg,
    var(--bg-primary) 0%,
    var(--bg-secondary) 100%
  );
}

.hero h1 {
  font-size: clamp(36px, 8vw, 56px);
  font-weight: 800;
  margin-bottom: 16px;
  background: linear-gradient(
    135deg,
    #fff5e6 0%,
    var(--accent-gold) 35%,
    var(--accent) 70%,
    var(--accent-dark) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 40px rgba(255, 69, 0, 0.3);
  filter: drop-shadow(0 0 20px rgba(255, 69, 0, 0.2));
}

.hero .tagline {
  font-size: clamp(16px, 3.5vw, 20px);
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-badges {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  border: 1px solid var(--border);
}

/* ─────────── 섹션 공통 ─────────── */
section {
  padding: 48px 0;
}

.section-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 32px;
}

/* ─────────── 기능 카드 그리드 ─────────── */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform 0.2s, border-color 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 4px 24px rgba(255, 69, 0, 0.15), 0 0 0 1px rgba(255, 69, 0, 0.3);
}

.feature-card .emoji {
  font-size: 32px;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
}

/* ─────────── Download 버튼 ─────────── */
.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  color: #fff5e6;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 700;
  font-size: 15px;
  transition: all 0.2s ease;
  box-shadow: 0 4px 16px rgba(255, 69, 0, 0.3);
  border: 1px solid rgba(255, 184, 0, 0.2);
}

.btn:hover {
  background: linear-gradient(135deg, var(--accent-hover) 0%, var(--accent) 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(255, 69, 0, 0.5);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--bg-card);
}

/* ─────────── 법적 문서 스타일 (privacy / terms) ─────────── */
.legal-container {
  max-width: 760px;
  margin: 48px auto;
  padding: 0 20px;
}

.legal-container h1 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.legal-container .legal-subtitle {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 40px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.legal-container h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
  margin-top: 40px;
  margin-bottom: 12px;
}

.legal-container h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 20px;
  margin-bottom: 8px;
}

.legal-container p,
.legal-container li {
  color: var(--text-secondary);
  font-size: 15px;
  margin-bottom: 10px;
}

.legal-container ul,
.legal-container ol {
  padding-left: 24px;
  margin-bottom: 16px;
}

.legal-container li {
  margin-bottom: 6px;
}

.legal-container strong {
  color: var(--text-primary);
  font-weight: 600;
}

.legal-container a {
  color: var(--accent);
  text-decoration: none;
}

.legal-container a:hover {
  text-decoration: underline;
}

/* 언어 구분 섹션 */
.lang-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 32px;
}

.lang-label {
  display: inline-block;
  background: var(--accent);
  color: #0f0f14;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 16px;
  text-transform: uppercase;
}

/* ─────────── 테이블 스타일 ─────────── */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  overflow: hidden;
}

.data-table th,
.data-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}

.data-table th {
  background: var(--bg-card);
  color: var(--text-primary);
  font-weight: 600;
}

.data-table td {
  color: var(--text-secondary);
}

.data-table tr:last-child td {
  border-bottom: none;
}

/* ─────────── 푸터 ─────────── */
footer {
  margin-top: auto;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 40px 0 24px;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  list-style: none;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-copyright {
  color: var(--text-muted);
  font-size: 13px;
}

/* ─────────── 모바일 대응 ─────────── */
@media (max-width: 640px) {
  .hero {
    padding: 60px 0 40px;
  }

  section {
    padding: 32px 0;
  }

  .section-title {
    font-size: 24px;
  }

  .nav-links {
    gap: 12px;
  }

  .nav-links a {
    font-size: 13px;
  }

  .legal-container {
    margin: 32px auto;
  }

  .legal-container h1 {
    font-size: 26px;
  }

  .legal-container h2 {
    font-size: 19px;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    justify-content: center;
  }
}