/* ========================================
   PsyQuiz Portal — Design System
   ======================================== */

/* --- CSS Variables --- */
:root {
  /* 배경 */
  --bg: #F0F4FF;
  --bg-warm: #F8F6FF;
  --card-bg: #FFFFFF;
  --card-bg-hover: #F8FAFF;

  /* 텍스트 */
  --text-primary: #2C3E50;
  --text-secondary: #5D6D7E;
  --text-muted: #95A5A6;
  --text-inverse: #FFFFFF;

  /* 브랜드 */
  --brand-primary: #3498DB;
  --brand-secondary: #9B59B6;
  --brand-gradient: linear-gradient(135deg, #3498DB, #9B59B6);

  /* 상태 */
  --status-complete: #27AE60;
  --status-complete-bg: #D5F5E3;
  --status-dev: #F39C12;
  --status-dev-bg: #FEF9E7;

  /* 공통 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 999px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.14);
  --shadow-glow: 0 0 20px rgba(52,152,219,0.3);
  --transition: 0.25s ease;
  --transition-fast: 0.15s ease;
  --transition-slow: 0.4s ease;

  /* 폰트 */
  --font-family: 'Pretendard Variable', 'Pretendard', -apple-system, BlinkMacSystemFont, '맑은 고딕', sans-serif;

  /* 보더 */
  --border-color: rgba(0,0,0,0.06);
}

/* 다크모드 */
[data-theme="dark"] {
  --bg: #0F0F23;
  --bg-warm: #1A1A3E;
  --card-bg: #1E1E3F;
  --card-bg-hover: #2A2A5A;
  --text-primary: #E8E8F0;
  --text-secondary: #A0A0C0;
  --text-muted: #6B6B8A;
  --text-inverse: #FFFFFF;
  --status-complete-bg: #1A3D2A;
  --status-dev-bg: #3D3520;
  --border-color: rgba(255,255,255,0.1);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.4);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
}

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

/* 스킵 링크 */
.skip-link {
  position: absolute;
  top: -100%;
  left: 8px;
  background: var(--brand-primary);
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  z-index: 9999;
  font-size: 0.85rem;
}
.skip-link:focus {
  top: 8px;
}

/* --- 다크모드 토글 (고정) --- */
.btn-theme-float {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 100;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--card-bg);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.btn-theme-float:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-lg);
}
.btn-theme-float:active {
  transform: scale(0.95);
}

/* --- Hero 섹션 --- */
.hero {
  text-align: center;
  padding: 60px 20px 48px;
  animation: slideUp 0.6s ease;
}

.hero-icon {
  font-size: 3.5rem;
  margin-bottom: 12px;
  animation: float 3s ease-in-out infinite;
}

.hero-title {
  font-size: 2.8rem;
  font-weight: 900;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 400px;
  margin: 0 auto 24px;
  line-height: 1.7;
}

.hero-features {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.feature-chip {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
}

/* --- 과목 섹션 --- */
.courses-section {
  padding: 0 20px 40px;
  max-width: 960px;
  margin: 0 auto;
}

/* 분야 그룹 */
.field-group {
  margin-bottom: 40px;
}

.field-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border-color);
}

.field-icon {
  font-size: 2rem;
}

.field-title {
  font-size: 1.4rem;
  font-weight: 800;
}

.field-title-en {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.field-count {
  margin-left: auto;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--card-bg);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-color);
}

/* 과목 카드 그리드 */
.course-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 520px) {
  .course-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 800px) {
  .course-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* 과목 카드 */
.course-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  background: var(--card-bg);
  border-radius: var(--radius-xl);
  padding: 32px 20px 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  cursor: pointer;
  animation: popIn 0.4s ease backwards;
}

.course-card:nth-child(1) { animation-delay: 0.1s; }
.course-card:nth-child(2) { animation-delay: 0.2s; }
.course-card:nth-child(3) { animation-delay: 0.3s; }

.course-card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-lg);
  border-color: var(--brand-primary);
}

.course-card:active {
  transform: scale(0.98);
}

/* 카드 상태 배지 */
.course-card-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
}

.badge-complete {
  background: var(--status-complete-bg);
  color: var(--status-complete);
}

.badge-dev {
  background: var(--status-dev-bg);
  color: var(--status-dev);
}

/* 카드 내용 */
.course-card-icon {
  font-size: 3rem;
  margin-bottom: 12px;
}

.course-card-title {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.course-card-title-en {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  font-weight: 500;
}

.course-card-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
}

.course-card-meta span {
  font-size: 0.72rem;
  color: var(--text-muted);
  background: var(--bg);
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  font-weight: 600;
}

/* 플레이스홀더 */
.field-placeholder {
  opacity: 0.7;
}

.placeholder-text {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
  text-align: center;
  padding: 24px;
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  border: 2px dashed var(--border-color);
}

/* --- 신청 게시판 --- */
.request-section {
  padding: 0 20px 60px;
  max-width: 720px;
  margin: 0 auto;
}

.section-title {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 8px;
  text-align: center;
}

.section-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 28px;
  line-height: 1.6;
}

/* 신청 폼 */
.request-form {
  background: var(--card-bg);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  margin-bottom: 28px;
}

.form-row {
  margin-bottom: 16px;
}

.form-row:last-of-type {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 10px 14px;
  font-size: 0.92rem;
  font-family: var(--font-family);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg);
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.15);
}

.form-textarea {
  resize: vertical;
  min-height: 60px;
}

/* 제출 버튼 */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 700;
  font-family: var(--font-family);
  color: var(--text-inverse);
  background: var(--brand-gradient);
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  box-shadow: var(--shadow-md), var(--shadow-glow);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-primary:active {
  transform: scale(0.97);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* 신청 목록 */
.request-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.request-loading {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  padding: 32px;
}

/* 신청 카드 */
.request-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: border-color var(--transition-fast);
  animation: slideUp 0.3s ease backwards;
}

.request-card:hover {
  border-color: rgba(52, 152, 219, 0.3);
}

.request-card-body {
  flex: 1;
  min-width: 0;
}

.request-card-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
  word-break: break-word;
}

.request-card-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
  line-height: 1.5;
  word-break: break-word;
}

.request-card-date {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* 동의 버튼 */
.agree-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 10px 14px;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg);
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
  min-width: 56px;
  font-family: var(--font-family);
}

.agree-btn:hover:not(.agreed) {
  border-color: var(--brand-primary);
  background: rgba(52, 152, 219, 0.08);
}

.agree-btn:active:not(.agreed) {
  transform: scale(0.95);
}

.agree-btn.agreed {
  border-color: var(--brand-primary);
  background: rgba(52, 152, 219, 0.12);
  cursor: default;
}

.agree-btn-icon {
  font-size: 1.2rem;
  line-height: 1;
}

.agree-btn.agreed .agree-btn-icon {
  animation: popIn 0.3s ease;
}

.agree-btn-count {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.agree-btn.agreed .agree-btn-count {
  color: var(--brand-primary);
}

/* 빈 목록 */
.request-empty {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  padding: 40px 20px;
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  border: 2px dashed var(--border-color);
}

/* --- 관련 플랫폼 섹션 --- */
.platforms-section {
  padding: 0 20px 60px;
  max-width: 960px;
  margin: 0 auto;
}

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

@media (min-width: 520px) {
  .platform-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 800px) {
  .platform-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.platform-card {
  display: flex;
  flex-direction: column;
  background: var(--card-bg);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: transform var(--transition), box-shadow var(--transition);
  text-decoration: none;
  color: inherit;
}

.platform-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.platform-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 20px 20px 16px;
}

.platform-psyda .platform-card-header {
  background: linear-gradient(135deg, #5B86E5, #36D1DC);
}

.platform-study .platform-card-header {
  background: linear-gradient(135deg, #56AB2F, #A8E063);
}

.platform-chat .platform-card-header {
  background: linear-gradient(135deg, #36D1DC, #5B86E5);
}

.platform-badge {
  font-size: 0.7rem;
  font-weight: 700;
  color: #fff;
  background: rgba(0,0,0,0.2);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
}

.platform-icon {
  font-size: 1.5rem;
  opacity: 0.9;
}

.platform-title {
  font-size: 1.2rem;
  font-weight: 800;
  padding: 0 20px;
  margin-top: -4px;
}

.platform-psyda .platform-title { color: #4A76D4; }
.platform-study .platform-title { color: #3D8C2E; }
.platform-chat .platform-title { color: #2BBBD0; }

[data-theme="dark"] .platform-psyda .platform-title { color: #7EA8F8; }
[data-theme="dark"] .platform-study .platform-title { color: #7ECF6A; }
[data-theme="dark"] .platform-chat .platform-title { color: #5CE0F0; }

.platform-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 4px 20px 12px;
}

.platform-features {
  list-style: none;
  padding: 0 20px 16px;
  flex: 1;
}

.platform-features li {
  font-size: 0.82rem;
  color: var(--text-secondary);
  padding: 4px 0;
  padding-left: 20px;
  position: relative;
}

.platform-features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  font-weight: 700;
}

.platform-psyda .platform-features li::before { color: #4A76D4; }
.platform-study .platform-features li::before { color: #3D8C2E; }
.platform-chat .platform-features li::before { color: #2BBBD0; }

.platform-link {
  display: block;
  text-align: center;
  padding: 12px 20px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-inverse);
  background: #2C3E50;
  transition: background var(--transition-fast);
}

.platform-card:hover .platform-link {
  background: #34495E;
}

[data-theme="dark"] .platform-link {
  background: #1A1A3E;
}

[data-theme="dark"] .platform-card:hover .platform-link {
  background: #2A2A5A;
}

/* --- Footer --- */
.footer {
  text-align: center;
  padding: 24px 20px;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
}

/* --- Animations --- */
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes popIn {
  from {
    opacity: 0;
    transform: scale(0.5);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* --- 반응형 --- */
@media (min-width: 600px) {
  .hero {
    padding: 80px 32px 56px;
  }

  .hero-title {
    font-size: 3.5rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
    max-width: 500px;
  }

  .courses-section {
    padding: 0 32px 48px;
  }

  .request-section {
    padding: 0 32px 80px;
  }

  .request-form {
    padding: 32px;
  }
}

@media (min-width: 900px) {
  .hero-title {
    font-size: 4rem;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus visible */
:focus-visible {
  outline: 3px solid var(--brand-primary);
  outline-offset: 2px;
}