/* ============================================================
   UltraFastNotepad — 공통 스타일시트
   색상 테마: 앰버 (#FF8F00 primary, #FFF8E1 배경)
   다크모드: prefers-color-scheme 지원
   모바일 우선 반응형
   ============================================================ */

/* --- CSS 변수 (라이트 모드) --- */
:root {
  --color-primary: #FF8F00;
  --color-primary-dark: #E65100;
  --color-primary-light: #FFB300;
  --color-bg: #FFF8E1;
  --color-bg-card: #FFFFFF;
  --color-bg-footer: #F5F0E0;
  --color-text: #3E2723;
  --color-text-secondary: #6D4C41;
  --color-text-muted: #8D6E63;
  --color-border: #FFE0B2;
  --color-shadow: rgba(255, 143, 0, 0.1);
  --color-hero-gradient-start: #FFF8E1;
  --color-hero-gradient-end: #FFE0B2;
  --max-width: 1100px;
  --radius: 12px;
  --radius-sm: 8px;
}

/* --- 다크모드 --- */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1A1410;
    --color-bg-card: #2A2018;
    --color-bg-footer: #1A1410;
    --color-text: #FFF8E1;
    --color-text-secondary: #FFCC80;
    --color-text-muted: #BCAAA4;
    --color-border: #4E342E;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-hero-gradient-start: #1A1410;
    --color-hero-gradient-end: #2A2018;
  }
}

/* --- 리셋 --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    'Noto Sans KR', 'Noto Sans JP', sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
}

/* --- 레이아웃 --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* --- 네비게이션 --- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-text);
  text-decoration: none;
}

.navbar-brand:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.navbar-brand .brand-icon {
  width: 32px;
  height: 32px;
  background: var(--color-primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFF;
  font-weight: 900;
  font-size: 1rem;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}

.navbar-links a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

.navbar-links a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

/* 언어 선택 */
.lang-switcher {
  display: flex;
  gap: 4px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 3px;
}

.lang-btn {
  background: none;
  border: none;
  padding: 4px 10px;
  border-radius: 16px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all 0.2s;
}

.lang-btn:hover {
  color: var(--color-primary);
}

.lang-btn.active {
  background: var(--color-primary);
  color: #FFF;
}

/* --- 히어로 섹션 --- */
.hero {
  background: linear-gradient(135deg, var(--color-hero-gradient-start), var(--color-hero-gradient-end));
  padding: 80px 0 60px;
  text-align: center;
}

.hero h1 {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.hero h1 span {
  color: var(--color-primary);
}

.hero .slogan {
  font-size: 1.3rem;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  font-weight: 500;
}

.hero-badges {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.badge-link img {
  height: 50px;
}

.hero-screenshot {
  max-width: 300px;
  margin: 0 auto;
  border-radius: 24px;
  box-shadow: 0 20px 60px var(--color-shadow);
  border: 2px solid var(--color-border);
  background: var(--color-bg-card);
  aspect-ratio: 9/16;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* --- 기능 카드 섹션 --- */
.section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text);
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  margin-bottom: 48px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px var(--color-shadow);
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, #FFF3E0, #FFE0B2);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin: 0 auto 16px;
}

@media (prefers-color-scheme: dark) {
  .feature-icon {
    background: linear-gradient(135deg, #3E2723, #4E342E);
  }
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --- Pro 섹션 --- */
.pro-section {
  background: linear-gradient(135deg, #FF8F00, #E65100);
  color: #FFF;
  padding: 80px 0;
  text-align: center;
  border-radius: 0;
}

.pro-section .section-title {
  color: #FFF;
}

.pro-section .section-subtitle {
  color: rgba(255, 255, 255, 0.85);
}

.pro-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 24px;
  padding: 8px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.pro-features {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
  margin-top: 32px;
}

.pro-feature-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.05rem;
  font-weight: 500;
}

.pro-feature-item .check {
  width: 24px;
  height: 24px;
  background: rgba(255, 255, 255, 0.25);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
}

/* --- 푸터 --- */
.footer {
  background: var(--color-bg-footer);
  border-top: 1px solid var(--color-border);
  padding: 40px 0 24px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 24px;
}

.footer-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
  margin-bottom: 4px;
}

.footer-brand-sub {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.footer-bottom {
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

/* --- 법적 페이지 스타일 --- */
.legal-page {
  padding: 40px 0 80px;
}

.legal-page h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.legal-meta {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 40px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.legal-page h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-top: 40px;
  margin-bottom: 16px;
  color: var(--color-primary-dark);
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-border);
}

@media (prefers-color-scheme: dark) {
  .legal-page h2 {
    color: var(--color-primary-light);
  }
}

.legal-page h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 28px;
  margin-bottom: 12px;
  color: var(--color-text);
}

.legal-page p,
.legal-page li {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 12px;
}

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

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

.legal-page table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.9rem;
}

.legal-page table th,
.legal-page table td {
  border: 1px solid var(--color-border);
  padding: 10px 14px;
  text-align: left;
}

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

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

.highlight-box {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 20px;
  margin: 20px 0;
}

.highlight-box p {
  color: var(--color-text);
  font-weight: 500;
}

/* --- 지원 페이지 --- */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  text-align: left;
  transition: background 0.2s;
}

.faq-question:hover {
  background: var(--color-hero-gradient-end);
}

.faq-question .arrow {
  font-size: 0.8rem;
  transition: transform 0.3s;
  color: var(--color-primary);
}

.faq-item.open .faq-question .arrow {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.contact-section {
  max-width: 600px;
  margin: 60px auto 0;
  text-align: center;
}

.contact-section h2 {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.contact-email-btn {
  display: inline-block;
  background: var(--color-primary);
  color: #FFF;
  padding: 14px 32px;
  border-radius: 28px;
  font-size: 1rem;
  font-weight: 600;
  transition: background 0.2s, transform 0.2s;
}

.contact-email-btn:hover {
  background: var(--color-primary-dark);
  color: #FFF;
  text-decoration: none;
  transform: translateY(-2px);
}

/* 버그 신고 폼 */
.bug-form {
  max-width: 600px;
  margin: 40px auto 0;
  text-align: left;
}

.bug-form h2 {
  font-size: 1.3rem;
  margin-bottom: 20px;
  text-align: center;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 6px;
  color: var(--color-text);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  background: var(--color-bg-card);
  color: var(--color-text);
  font-family: inherit;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

.submit-btn {
  display: inline-block;
  background: var(--color-primary);
  color: #FFF;
  padding: 12px 32px;
  border: none;
  border-radius: 24px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.submit-btn:hover {
  background: var(--color-primary-dark);
}

/* --- 반응형 --- */
@media (max-width: 768px) {
  .hero {
    padding: 48px 0 40px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero .slogan {
    font-size: 1.1rem;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .pro-features {
    flex-direction: column;
    align-items: center;
    gap: 16px;
  }

  .footer-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .footer-links {
    justify-content: center;
  }

  .navbar-links {
    gap: 12px;
  }

  .section {
    padding: 48px 0;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .legal-page h1 {
    font-size: 1.5rem;
  }

  .legal-page h2 {
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  .navbar .container {
    flex-wrap: wrap;
    height: auto;
    padding: 10px 20px;
    gap: 8px;
  }

  .navbar-links {
    width: 100%;
    justify-content: center;
    gap: 8px;
    font-size: 0.8rem;
  }

  .hero h1 {
    font-size: 1.6rem;
  }

  .lang-btn {
    padding: 3px 8px;
    font-size: 0.75rem;
  }
}