/* =========================================================================
   DRM4 Survey — Style Sheet
   한국 고등학생 일상생활 활동 및 정서 조사
   ========================================================================= */

/* --- Reset & Base --- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;600;700&display=swap');

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

:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: rgba(255, 255, 255, 0.05);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --border-glass: rgba(255, 255, 255, 0.1);
  --text-primary: #e8e8f0;
  --text-secondary: #a0a0b8;
  --text-muted: #6b6b80;
  --accent-positive: #4ade80;
  --accent-positive-bg: rgba(74, 222, 128, 0.1);
  --accent-positive-border: rgba(74, 222, 128, 0.3);
  --accent-negative: #f87171;
  --accent-negative-bg: rgba(248, 113, 113, 0.1);
  --accent-negative-border: rgba(248, 113, 113, 0.3);
  --accent-blue: #60a5fa;
  --accent-blue-bg: rgba(96, 165, 250, 0.1);
  --accent-purple: #a78bfa;
  --accent-purple-bg: rgba(167, 139, 250, 0.1);
  --accent-amber: #fbbf24;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --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);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* --- App Container --- */
.app-container {
  max-width: 640px;
  margin: 0 auto;
  padding: 1rem;
  padding-bottom: 2rem;
}

/* --- Header --- */
.app-header {
  text-align: center;
  padding: 2rem 1rem 1.5rem;
}

.app-header__badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
  color: #fff;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.app-header__title {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, #fff, #c8c8e0);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.3rem;
}

.app-header__subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* --- Progress Bar --- */
.progress-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-bottom: 1.5rem;
  padding: 0 1rem;
  transition: opacity 0.3s ease, max-height 0.3s ease;
}

.progress-bar.hide {
  opacity: 0;
  max-height: 0;
  margin-bottom: 0;
  overflow: hidden;
  pointer-events: none;
}

.progress-step {
  display: flex;
  align-items: center;
}

.progress-step__circle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 2px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  position: relative;
  transition: var(--transition);
  flex-shrink: 0;
}

.progress-step__label {
  position: absolute;
  top: calc(100% + 4px);
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.6rem;
  white-space: nowrap;
  color: var(--text-muted);
  font-weight: 400;
}

.progress-step__line {
  width: 40px;
  height: 2px;
  background: var(--border-glass);
  transition: var(--transition);
}

.progress-step.active .progress-step__circle {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 0 16px rgba(167, 139, 250, 0.4);
}

.progress-step.active .progress-step__label {
  color: var(--accent-purple);
  font-weight: 500;
}

.progress-step.completed .progress-step__circle {
  background: var(--accent-positive);
  border-color: transparent;
  color: #fff;
}

.progress-step.completed .progress-step__label {
  color: var(--accent-positive);
}

.progress-step.completed + .progress-step .progress-step__line,
.progress-step__line.completed {
  background: var(--accent-positive);
}

/* --- Glass Card --- */
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: var(--transition);
}

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

/* --- Section / Page --- */
.part-section {
  display: none;
  animation: fadeSlideIn 0.4s ease;
}

.part-section.active {
  display: block;
}

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.part-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.part-description {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

/* --- Intro Page --- */
.intro-hero {
  text-align: center;
  padding: 2rem 1rem;
}

.intro-hero__icon {
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

.intro-hero__title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.intro-hero__subtitle {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.intro-card {
  margin-bottom: 1rem;
}

.intro-card__heading {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.intro-card__text {
  color: var(--text-secondary);
  line-height: 1.7;
}

.intro-step {
  display: flex;
  gap: 0.8rem;
  align-items: flex-start;
  padding: 0.6rem 0;
}

.intro-step__number {
  width: 28px;
  height: 28px;
  min-width: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
}

.intro-step__title {
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.15rem;
}

.intro-step__desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* --- Form Elements --- */
.form-group {
  margin-bottom: 1rem;
}

.form-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 500;
  margin-bottom: 0.35rem;
  color: var(--text-secondary);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.88rem;
  transition: var(--transition);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--accent-purple);
  box-shadow: 0 0 0 3px rgba(167, 139, 250, 0.15);
}

.form-select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23a0a0b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 0.7rem center;
  background-size: 1rem;
  padding-right: 2.2rem;
}

.form-select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

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

/* --- Activity Card --- */
.activity-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 0.75rem;
  position: relative;
  transition: var(--transition);
}

.activity-card--positive {
  border-left: 3px solid var(--accent-positive);
}

.activity-card--negative {
  border-left: 3px solid var(--accent-negative);
}

.activity-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.8rem;
}

.activity-card__number {
  font-size: 0.82rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.activity-card__number-badge {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 700;
  color: #fff;
}

.activity-card--positive .activity-card__number-badge {
  background: var(--accent-positive);
}

.activity-card--negative .activity-card__number-badge {
  background: var(--accent-negative);
}

.activity-card__delete {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 0.2rem;
  border-radius: 50%;
  transition: var(--transition);
  line-height: 1;
}

.activity-card__delete:hover {
  color: var(--accent-negative);
  background: var(--accent-negative-bg);
}

.activity-card__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
}

.activity-card__grid .form-group.full-width {
  grid-column: 1 / -1;
}

/* --- Likert Scale (Emotion) --- */
.emotion-group {
  margin-top: 0.8rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--border-glass);
}

.emotion-group__title {
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.emotion-group__title--positive {
  color: var(--accent-positive);
}

.emotion-group__title--negative {
  color: var(--accent-negative);
}

.emotion-group__title--meaning {
  color: var(--accent-amber);
}

.likert-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0;
  flex-wrap: wrap;
}

.likert-item__label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  min-width: 70px;
  flex-shrink: 0;
}

.likert-scale {
  display: flex;
  gap: 0.2rem;
  flex: 1;
  justify-content: flex-end;
}

.likert-radio {
  cursor: pointer;
  position: relative;
}

.likert-radio input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.likert-radio span {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-glass);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--transition);
}

.likert-radio:hover span {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}

.likert-radio input:checked + span {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 0 8px rgba(167, 139, 250, 0.3);
}

.likert-hint {
  display: flex;
  justify-content: space-between;
  font-size: 0.65rem;
  color: var(--text-muted);
  padding: 0 0 0.3rem;
}

/* --- Buttons --- */
.btn {
  padding: 0.7rem 1.5rem;
  border: none;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border-glass);
}

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

.btn-block {
  display: block;
  width: 100%;
  text-align: center;
  justify-content: center;
}

.btn-start-survey {
  font-size: 1rem;
  padding: 0.85rem 2rem;
}

.add-activity-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 0.8rem;
  border: 2px dashed var(--border-glass);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 1rem;
}

.add-activity-btn:hover {
  border-color: var(--accent-purple);
  color: var(--accent-purple);
  background: var(--accent-purple-bg);
}

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

/* --- Navigation Buttons --- */
.nav-buttons {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1.5rem;
  gap: 1rem;
}

/* --- Activity Count Badge --- */
.activity-count {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.8rem;
  background: var(--bg-card);
  border-radius: 20px;
  border: 1px solid var(--border-glass);
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.8rem;
  width: fit-content;
}

/* --- Background Survey (Demographics) --- */
.demo-card {
  margin-bottom: 0.8rem;
}

.radio-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.radio-option {
  cursor: pointer;
  position: relative;
}

.radio-option input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.radio-option span {
  display: inline-block;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-glass);
  background: rgba(255, 255, 255, 0.04);
  font-size: 0.82rem;
  color: var(--text-secondary);
  transition: var(--transition);
}

.radio-option:hover span {
  background: rgba(255, 255, 255, 0.08);
}

.radio-option input:checked + span {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
  border-color: transparent;
  color: #fff;
}

/* --- Completion Screen --- */
.completion-screen {
  text-align: center;
  padding: 3rem 1rem;
}

.completion-screen__icon {
  font-size: 4rem;
  margin-bottom: 1rem;
}

.completion-screen__title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.completion-screen__desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.submit-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.8rem;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
}

.submit-status__spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-glass);
  border-top-color: var(--accent-purple);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.submit-status__text {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.submit-status--success {
  border-color: var(--accent-positive-border);
  background: var(--accent-positive-bg);
}

.submit-status--success .submit-status__text {
  color: var(--accent-positive);
}

.submit-status--error {
  border-color: var(--accent-negative-border);
  background: var(--accent-negative-bg);
}

.submit-status--error .submit-status__text {
  color: var(--accent-negative);
}

/* --- Toast --- */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 0.7rem 1.2rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
  font-size: 0.85rem;
  box-shadow: var(--shadow-lg);
  transition: transform 0.3s ease, opacity 0.3s ease;
  opacity: 0;
  z-index: 1000;
  max-width: 90%;
  text-align: center;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* --- Section badges --- */
.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 12px;
  margin-bottom: 0.5rem;
}

.section-badge--positive {
  background: var(--accent-positive-bg);
  color: var(--accent-positive);
  border: 1px solid var(--accent-positive-border);
}

.section-badge--negative {
  background: var(--accent-negative-bg);
  color: var(--accent-negative);
  border: 1px solid var(--accent-negative-border);
}

.section-badge--info {
  background: var(--accent-blue-bg);
  color: var(--accent-blue);
  border: 1px solid rgba(96, 165, 250, 0.3);
}

/* --- Field Error --- */
.field-error {
  border-color: var(--accent-negative) !important;
  box-shadow: 0 0 0 2px var(--accent-negative-bg) !important;
  animation: shakeField 0.4s ease;
}

@keyframes shakeField {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-4px); }
  40% { transform: translateX(4px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}

.emotion-group.field-error {
  border-color: var(--accent-negative) !important;
  border: 1px solid var(--accent-negative);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  background: var(--accent-negative-bg);
}

/* --- Button Loading State --- */
.btn.is-loading {
  pointer-events: none;
  opacity: 0.7;
  position: relative;
}

.btn.is-loading::after {
  content: '';
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin-left: 0.4rem;
}

/* --- Retry Button --- */
.btn-retry {
  margin-top: 1rem;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
  color: #fff;
  padding: 0.6rem 1.5rem;
  border: none;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-retry:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* --- Responsive --- */
@media (max-width: 480px) {
  .app-container {
    padding: 0.75rem;
  }

  .app-header__title {
    font-size: 1.3rem;
  }

  .activity-card__grid {
    grid-template-columns: 1fr;
  }

  .likert-radio span {
    width: 32px;
    height: 32px;
    font-size: 0.72rem;
  }

  .likert-scale {
    gap: 0.15rem;
  }

  .progress-step__line {
    width: 28px;
  }

  .form-textarea {
    min-height: 80px;
  }

  .nav-buttons {
    flex-direction: column;
  }

  .nav-buttons .btn {
    width: 100%;
    justify-content: center;
  }

  .likert-endpoint {
    font-size: 0.52rem;
    min-width: 20px;
  }

  .activity-nav-btn {
    font-size: 0.72rem;
    padding: 0.3rem 0.5rem;
  }
}

/* --- Activity Navigation Bar --- */
.activity-nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.5rem 0.8rem;
  margin-bottom: 0.8rem;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
}

.activity-nav-btn {
  background: none;
  border: 1px solid var(--border-glass);
  color: var(--text-secondary);
  padding: 0.35rem 0.7rem;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.activity-nav-btn:hover:not(:disabled) {
  border-color: var(--accent-purple);
  color: var(--accent-purple);
  background: var(--accent-purple-bg);
}

.activity-nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.activity-nav-progress {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

.activity-actions {
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
}

/* --- Emotion Group Colored Backgrounds (DRM3 style) --- */
.emotion-group {
  margin-bottom: 0.6rem;
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-sm);
}

.emotion-group--positive {
  background: rgba(74, 222, 128, 0.06);
  border: 1px solid rgba(74, 222, 128, 0.15);
}

.emotion-group--negative {
  background: rgba(248, 113, 113, 0.06);
  border: 1px solid rgba(248, 113, 113, 0.15);
}

.emotion-group--meaning {
  background: rgba(251, 191, 36, 0.10);
  border: 1px solid rgba(251, 191, 36, 0.25);
}

.emotion-group--meaning .likert-item__label,
.emotion-group--meaning .emotion-group__title {
  color: #fde68a;
}

/* --- Likert Endpoint Labels --- */
.likert-scale-wrap {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex: 1;
  justify-content: flex-end;
}

.likert-endpoint {
  font-size: 0.58rem;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.15;
  min-width: 26px;
  flex-shrink: 0;
}