/* ============================================
   EngExe — Design System & Styles
   ============================================ */

/* === CSS Variables === */
:root {
  /* Colors - HSL based */
  --bg-primary: hsl(230, 25%, 7%);
  --bg-secondary: hsl(230, 20%, 10%);
  --bg-tertiary: hsl(230, 18%, 14%);
  --bg-card: hsl(230, 20%, 11%);
  --bg-card-hover: hsl(230, 20%, 13%);

  --surface-glass: hsla(230, 25%, 18%, 0.4);
  --surface-glass-border: hsla(230, 30%, 30%, 0.3);
  --surface-glass-hover: hsla(230, 25%, 22%, 0.5);

  --text-primary: hsl(0, 0%, 95%);
  --text-secondary: hsl(230, 10%, 65%);
  --text-tertiary: hsl(230, 10%, 45%);
  --text-on-accent: hsl(0, 0%, 100%);

  --accent-primary: hsl(245, 80%, 65%);
  --accent-primary-hover: hsl(245, 80%, 72%);
  --accent-secondary: hsl(270, 70%, 65%);
  --accent-gradient: linear-gradient(135deg, hsl(245, 80%, 65%), hsl(280, 70%, 60%));
  --accent-gradient-vivid: linear-gradient(135deg, hsl(245, 90%, 68%), hsl(310, 80%, 60%));

  --success: hsl(150, 60%, 50%);
  --success-bg: hsla(150, 60%, 50%, 0.12);
  --warning: hsl(40, 90%, 60%);
  --warning-bg: hsla(40, 90%, 60%, 0.12);
  --error: hsl(0, 70%, 60%);
  --error-bg: hsla(0, 70%, 60%, 0.12);
  --info: hsl(210, 80%, 60%);
  --info-bg: hsla(210, 80%, 60%, 0.12);

  /* Type colors */
  --color-word-arrange: hsl(210, 80%, 60%);
  --color-word-arrange-bg: hsla(210, 80%, 60%, 0.1);
  --color-grammar: hsl(280, 70%, 60%);
  --color-grammar-bg: hsla(280, 70%, 60%, 0.1);
  --color-vocab: hsl(150, 60%, 50%);
  --color-vocab-bg: hsla(150, 60%, 50%, 0.1);
  --color-summary: hsl(30, 80%, 55%);
  --color-summary-bg: hsla(30, 80%, 55%, 0.1);
  --color-blank: hsl(300, 70%, 65%);
  --color-blank-bg: hsla(300, 70%, 65%, 0.1);
  --color-true-false: hsl(0, 70%, 65%);
  --color-true-false-bg: hsla(0, 70%, 65%, 0.1);
  --color-insertion: hsl(50, 90%, 55%);
  --color-insertion-bg: hsla(50, 90%, 55%, 0.1);
  --color-implication: hsl(180, 70%, 50%);
  --color-implication-bg: hsla(180, 70%, 50%, 0.1);
  --color-subject: hsl(330, 80%, 60%);
  --color-subject-bg: hsla(330, 80%, 60%, 0.1);

  /* Typography */
  --font-sans: 'Inter', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px hsla(0, 0%, 0%, 0.15);
  --shadow-md: 0 4px 16px hsla(0, 0%, 0%, 0.2);
  --shadow-lg: 0 8px 32px hsla(0, 0%, 0%, 0.3);
  --shadow-xl: 0 16px 48px hsla(0, 0%, 0%, 0.4);
  --shadow-glow: 0 0 40px hsla(245, 80%, 65%, 0.15);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-spring: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* === Background Particles === */
.bg-particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.bg-particle {
  position: absolute;
  border-radius: 50%;
  opacity: 0;
  animation: particleFloat linear infinite;
}

@keyframes particleFloat {
  0% {
    opacity: 0;
    transform: translateY(100vh) scale(0);
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translateY(-10vh) scale(1);
  }
}

/* === Scrollbar === */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: hsla(230, 20%, 30%, 0.5);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: hsla(230, 20%, 40%, 0.6);
}

/* === Header === */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: hsla(230, 25%, 7%, 0.8);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--surface-glass-border);
  transition: var(--transition-base);
}

.header.scrolled {
  background: hsla(230, 25%, 7%, 0.95);
  box-shadow: var(--shadow-md);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-gradient);
  border-radius: var(--radius-md);
  color: white;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--accent-gradient-vivid);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-badge {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 6px;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  color: white;
  letter-spacing: 0.05em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent-gradient);
  color: var(--text-on-accent);
  box-shadow: 0 4px 16px hsla(245, 80%, 65%, 0.3);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px hsla(245, 80%, 65%, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

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

.btn-ghost:hover {
  background: var(--surface-glass-hover);
  color: var(--text-primary);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
}

.btn-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
}

.btn-icon:hover {
  background: var(--surface-glass);
  color: var(--text-primary);
}

.btn-generate {
  padding: 12px 28px;
  font-size: 1rem;
  border-radius: var(--radius-lg);
}

.btn-generate:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* === Modal === */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: hsla(0, 0%, 0%, 0.6);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 520px;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  transform: translateY(20px) scale(0.97);
  transition: all var(--transition-spring);
}

.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

.modal-lg {
  max-width: 640px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-xl);
  border-bottom: 1px solid var(--surface-glass-border);
}

.modal-header h3 {
  font-size: 1.1rem;
  font-weight: 700;
}

.btn-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-glass);
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-close:hover {
  background: var(--error-bg);
  color: var(--error);
}

.modal-body {
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.modal-footer {
  padding: var(--space-md) var(--space-xl) var(--space-xl);
  display: flex;
  justify-content: flex-end;
}

/* === Forms === */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-group input[type="password"],
.form-group input[type="text"],
.form-group select {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  transition: all var(--transition-fast);
  outline: none;
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px hsla(245, 80%, 65%, 0.15);
}

.input-with-icon {
  position: relative;
}

.input-with-icon input {
  padding-right: 44px;
}

.btn-toggle-pw {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 4px;
  display: flex;
  transition: color var(--transition-fast);
}

.btn-toggle-pw:hover {
  color: var(--text-secondary);
}

.form-hint {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.form-link {
  font-size: 0.8rem;
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.form-link:hover {
  color: var(--accent-primary-hover);
  text-decoration: underline;
}

.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.checkbox-group-row {
  flex-direction: row;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.875rem;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 6px 0;
  transition: color var(--transition-fast);
}

.checkbox-label:hover {
  color: var(--text-primary);
}

.checkbox-label input[type="checkbox"] {
  display: none;
}

.checkbox-custom {
  width: 18px;
  height: 18px;
  border: 2px solid var(--surface-glass-border);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.checkbox-label input:checked + .checkbox-custom {
  background: var(--accent-gradient);
  border-color: var(--accent-primary);
}

.checkbox-label input:checked + .checkbox-custom::after {
  content: '✓';
  color: white;
  font-size: 0.7rem;
  font-weight: 700;
}

input[type="range"] {
  width: 100%;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent-gradient);
  cursor: pointer;
  border: 2px solid var(--bg-primary);
  box-shadow: 0 2px 8px hsla(245, 80%, 65%, 0.3);
}

.range-value {
  font-size: 0.8rem;
  color: var(--accent-primary);
  font-weight: 600;
}

/* === Hero === */
.main {
  position: relative;
  z-index: 1;
  padding-top: 64px;
}

.hero {
  padding: var(--space-3xl) var(--space-lg) var(--space-xl);
  text-align: center;
}

.hero-content {
  max-width: 700px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 6px 16px;
  background: var(--surface-glass);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-primary);
  margin-bottom: var(--space-lg);
  animation: fadeInUp 0.6s ease;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.5); }
}

.hero-title {
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.04em;
  margin-bottom: var(--space-md);
  animation: fadeInUp 0.6s ease 0.1s both;
}

.gradient-text {
  background: var(--accent-gradient-vivid);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
  animation: fadeInUp 0.6s ease 0.2s both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* === Input Section === */
.input-section {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-2xl);
  animation: fadeInUp 0.6s ease 0.3s both;
}

/* === Mode Toggle === */
.mode-toggle {
  display: flex;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-lg);
  padding: 4px;
}

.mode-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 20px;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
}

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

.mode-btn.active {
  background: var(--accent-gradient);
  color: var(--text-on-accent);
  box-shadow: var(--shadow-sm);
}

/* === Generate Form === */
.gen-form {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.gen-row {
  display: flex;
  gap: var(--space-md);
}

.gen-field {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.gen-field-full {
  flex: 1 1 100%;
}

.gen-field label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.gen-field input[type="text"],
.gen-field select {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  outline: none;
  transition: all var(--transition-fast);
}

.gen-field input[type="text"]:focus,
.gen-field select:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px hsla(245, 80%, 65%, 0.15);
}

.gen-length-control {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.gen-length-control input[type="range"] {
  flex: 1;
}

.gen-checkbox {
  padding: 8px 0;
}

.gen-topics {
  margin-top: var(--space-xs);
}

.gen-topics-label {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  margin-bottom: var(--space-sm);
}

.gen-topic-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.gen-hint {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

/* === Passage Preview === */
.gen-preview {
  margin-top: var(--space-md);
  animation: fadeInUp 0.4s ease;
}

.gen-passage-text {
  padding: var(--space-lg);
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-primary);
  max-height: 400px;
  overflow-y: auto;
  white-space: pre-wrap;
}

@media (max-width: 768px) {
  .gen-row {
    flex-direction: column;
  }
}


.input-card {
  background: var(--bg-card);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-md);
}

.input-card:focus-within {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow);
}

.input-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid hsla(230, 20%, 20%, 0.5);
}

.input-card-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.input-card-actions {
  display: flex;
  gap: var(--space-xs);
}

textarea {
  width: 100%;
  min-height: 240px;
  padding: var(--space-lg);
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  line-height: 1.8;
  resize: vertical;
  outline: none;
}

textarea::placeholder {
  color: var(--text-tertiary);
}

.input-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid hsla(230, 20%, 20%, 0.5);
  background: hsla(230, 20%, 8%, 0.5);
}

.char-count {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

/* === Samples === */
.samples {
  text-align: center;
  margin-top: var(--space-lg);
}

.samples-label {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  margin-bottom: var(--space-sm);
}

.sample-chips {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.chip {
  padding: 8px 16px;
  background: var(--surface-glass);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-base);
}

.chip:hover {
  background: var(--surface-glass-hover);
  color: var(--text-primary);
  border-color: var(--accent-primary);
  transform: translateY(-1px);
}

/* === Loading === */
.loading-section {
  max-width: 500px;
  margin: var(--space-3xl) auto;
  padding: 0 var(--space-lg);
}

.loading-card {
  text-align: center;
  padding: var(--space-3xl) var(--space-xl);
}

.loading-animation {
  position: relative;
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-xl);
}

.loading-ring {
  position: absolute;
  inset: 0;
  border: 3px solid transparent;
  border-top-color: var(--accent-primary);
  border-right-color: var(--accent-secondary);
  border-radius: 50%;
  animation: spin 1.2s linear infinite;
}

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

.loading-icon {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-primary);
  animation: loadingPulse 1.5s ease infinite;
}

@keyframes loadingPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.9); }
}

.loading-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.loading-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.loading-progress {
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
  max-width: 300px;
  margin: 0 auto;
}

.loading-progress-bar {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  width: 0%;
  transition: width 0.5s ease;
}

/* === Results === */
.results-section {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg) var(--space-3xl);
  animation: fadeInUp 0.5s ease;
}

.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
  gap: var(--space-md);
}

.results-title {
  font-size: 1.5rem;
  font-weight: 800;
}

.results-meta {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.results-header-right {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  align-items: center;
}

/* === Dropdown === */
.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 240px;
  background: var(--bg-secondary);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 50;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-base);
  padding: var(--space-xs);
}

.dropdown-menu.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  width: 100%;
  padding: 10px 14px;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
}

.dropdown-item:hover {
  background: var(--surface-glass);
}

.dropdown-icon {
  font-size: 1rem;
  flex-shrink: 0;
}

.dropdown-hint {
  margin-left: auto;
  font-size: 0.7rem;
  color: var(--text-tertiary);
  font-weight: 400;
}

/* === Answer Sheet Panel === */
.answer-sheet {
  background: var(--bg-card);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.answer-sheet-header {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid hsla(230, 20%, 18%, 0.5);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 1rem;
}

.answer-sheet-body {
  padding: var(--space-lg);
}

.answer-group {
  margin-bottom: var(--space-lg);
}

.answer-group:last-child {
  margin-bottom: 0;
}

.answer-group-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--surface-glass-border);
}

.answer-entry {
  padding: var(--space-sm) 0;
  border-bottom: 1px solid hsla(230, 20%, 18%, 0.3);
}

.answer-entry:last-child {
  border-bottom: none;
}

.answer-entry-num {
  font-weight: 700;
  color: var(--accent-primary);
  margin-right: var(--space-sm);
}

.answer-entry-answer {
  font-weight: 600;
  color: var(--success);
}

.answer-entry-explain {
  display: block;
  margin-top: 4px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
  padding-left: var(--space-lg);
}

/* === Result Passage === */
.result-passage {
  margin-bottom: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-tertiary);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-lg);
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-primary);
  white-space: pre-wrap;
  max-height: 250px;
  overflow-y: auto;
}
.result-passage-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-primary);
  margin-bottom: var(--space-sm);
  display: block;
  border-bottom: 1px solid var(--surface-glass-border);
  padding-bottom: var(--space-xs);
}

/* === Tabs === */
.tabs {
  display: flex;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
  background: var(--bg-secondary);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-lg);
  padding: 4px;
  overflow-x: auto;
}

.tab {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 10px 18px;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.tab:hover {
  color: var(--text-primary);
  background: var(--surface-glass);
}

.tab.active {
  background: var(--surface-glass);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.tab-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.tab-count {
  font-size: 0.7rem;
  padding: 1px 6px;
  background: var(--surface-glass);
  border-radius: var(--radius-full);
  color: var(--text-tertiary);
}

/* === Question Cards === */
.results-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.question-panel {
  display: none;
}

.question-panel.active {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  animation: fadeInUp 0.3s ease;
}

.all-section-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  background: var(--surface-glass);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-md);
  margin-top: var(--space-md);
}

.all-section-header:first-child {
  margin-top: 0;
}

.question-card {
  background: var(--bg-card);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}

.question-card:hover {
  border-color: hsla(230, 30%, 35%, 0.5);
  box-shadow: var(--shadow-md);
}

.question-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid hsla(230, 20%, 18%, 0.5);
}

.question-number {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
}

.question-type-label {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Type-specific colors */
.type-word-arrange .question-number {
  background: var(--color-word-arrange-bg);
  color: var(--color-word-arrange);
}
.type-word-arrange .question-type-label {
  background: var(--color-word-arrange-bg);
  color: var(--color-word-arrange);
}

.type-grammar .question-number {
  background: var(--color-grammar-bg);
  color: var(--color-grammar);
}
.type-grammar .question-type-label {
  background: var(--color-grammar-bg);
  color: var(--color-grammar);
}

.type-vocab .question-number {
  background: var(--color-vocab-bg);
  color: var(--color-vocab);
}
.type-vocab .question-type-label {
  background: var(--color-vocab-bg);
  color: var(--color-vocab);
}

.type-summary .question-number {
  background: var(--color-summary-bg);
  color: var(--color-summary);
}
.type-summary .question-type-label {
  background: var(--color-summary-bg);
  color: var(--color-summary);
}

.type-blank .question-number {
  background: var(--color-blank-bg);
  color: var(--color-blank);
}
.type-blank .question-type-label {
  background: var(--color-blank-bg);
  color: var(--color-blank);
}

.type-true-false .question-number {
  background: var(--color-true-false-bg);
  color: var(--color-true-false);
}
.type-true-false .question-type-label {
  background: var(--color-true-false-bg);
  color: var(--color-true-false);
}

.type-insertion .question-number {
  background: var(--color-insertion-bg);
  color: var(--color-insertion);
}
.type-insertion .question-type-label {
  background: var(--color-insertion-bg);
  color: var(--color-insertion);
}

.type-implication .question-number {
  background: var(--color-implication-bg);
  color: var(--color-implication);
}
.type-implication .question-type-label {
  background: var(--color-implication-bg);
  color: var(--color-implication);
}

.type-subject .question-number {
  background: var(--color-subject-bg);
  color: var(--color-subject);
}
.type-subject .question-type-label {
  background: var(--color-subject-bg);
  color: var(--color-subject);
}

.question-card-body {
  padding: var(--space-lg);
}

.question-text {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.question-text .korean {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.word-box {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  border: 1px dashed var(--surface-glass-border);
}

.word-chip {
  padding: 6px 14px;
  background: var(--surface-glass);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--text-primary);
  font-weight: 500;
  transition: all var(--transition-fast);
  cursor: default;
}

.grammar-options {
  display: inline;
  font-weight: 700;
  color: var(--accent-primary);
  padding: 2px 8px;
  background: hsla(245, 80%, 65%, 0.1);
  border-radius: 4px;
}

.choices-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.choice-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.choice-item:hover {
  background: var(--surface-glass-hover);
}

.choice-label {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-glass);
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-secondary);
  flex-shrink: 0;
}

/* Answer display */
.answer-box {
  margin-top: var(--space-md);
  padding: var(--space-md);
  background: var(--success-bg);
  border: 1px solid hsla(150, 60%, 50%, 0.2);
  border-radius: var(--radius-md);
  display: none;
}

.answer-box.visible {
  display: block;
  animation: fadeInUp 0.3s ease;
}

.answer-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--success);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xs);
}

.answer-text {
  font-size: 0.9rem;
  color: var(--text-primary);
  line-height: 1.6;
}

/* === History === */
.history-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.history-date-group {
  margin-bottom: var(--space-md);
}

.history-date-header {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent-primary);
  margin-bottom: var(--space-sm);
  padding-bottom: 4px;
  border-bottom: 1px solid var(--surface-glass-border);
}

.history-date-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.history-topic-group {
  background: var(--bg-secondary);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.history-topic-header {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 10px 14px;
  background: var(--bg-tertiary);
  font-size: 0.85rem;
  font-weight: 600;
}

.topic-icon { font-size: 1rem; }
.topic-name { color: var(--text-primary); }

.history-topic-items {
  display: flex;
  flex-direction: column;
}

.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  border-top: 1px solid var(--surface-glass-border);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.history-item:hover {
  background: var(--surface-glass-hover);
}

.history-item-left {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.history-item-title {
  font-size: 0.85rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

.badge {
  font-size: 0.65rem;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 700;
}
.badge-ai { background: var(--accent-gradient); color: white; }
.badge-direct { background: var(--surface-glass); color: var(--text-secondary); border: 1px solid var(--surface-glass-border); }

.history-item-meta {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.history-item-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.btn-regen-history {
  font-size: 1rem;
  opacity: 0.7;
}
.btn-regen-history:hover {
  opacity: 1;
  background: var(--surface-glass-border);
}

.empty-state {
  text-align: center;
  color: var(--text-tertiary);
  padding: var(--space-xl);
  font-size: 0.9rem;
}

/* === Footer === */
.footer {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  color: var(--text-tertiary);
  font-size: 0.8rem;
  border-top: 1px solid var(--surface-glass-border);
}

/* === Print Styles === */
.print-area {
  display: none;
}

@media print {
  /* Hide everything except print area */
  .header,
  .main,
  .footer,
  .modal-overlay,
  .bg-particles {
    display: none !important;
  }
  .print-area {
    display: block !important;
    position: static;
    width: 100%;
    background: white;
    color: black;
    padding: 10mm;
    font-family: 'Malgun Gothic', '맑은 고딕', 'Noto Sans KR', sans-serif;
    font-size: 11pt;
    line-height: 1.7;
  }
  .print-area h1 {
    font-size: 16pt;
    margin-bottom: 10pt;
    border-bottom: 2px solid #333;
    padding-bottom: 6pt;
  }
  .print-area h2 {
    font-size: 13pt;
    margin-top: 14pt;
    margin-bottom: 6pt;
    color: #333;
    border-left: 3px solid #6366f1;
    padding-left: 8pt;
  }
  .print-area .print-question {
    margin-bottom: 12pt;
    page-break-inside: avoid;
  }
  .print-area .print-q-num {
    font-weight: 700;
    margin-right: 4pt;
  }
  .print-area .print-words {
    margin-top: 4pt;
    padding: 6pt;
    border: 1px dashed #aaa;
  }
  .print-area .print-word {
    display: inline-block;
    padding: 3pt 8pt;
    margin: 2pt 3pt;
    border: 1px solid #ccc;
    font-size: 10pt;
  }
  .print-area .print-grammar {
    font-weight: 700;
    color: #333;
  }
  .print-area .print-answer-section {
    page-break-before: always;
    border-top: 1px solid #aaa;
    padding-top: 10pt;
  }
}

/* === Responsive === */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-desc {
    font-size: 0.9rem;
  }

  .results-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .results-header-right {
    width: 100%;
    overflow-x: auto;
  }

  .tabs {
    overflow-x: auto;
  }

  .input-card-header {
    flex-direction: column;
    gap: var(--space-sm);
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.6rem;
  }

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

  .input-card-footer {
    flex-direction: column;
    gap: var(--space-sm);
  }
}