:root {
  --primary-color: #7da100;
  --primary-dark: #638000;
  --primary-light: #f3f8e5;
  --primary-border: #c4dc66;
  --dialog-bg: #eaf4fb;
  --dialog-border: #b9ddf5;
  --dialog-text: #0b4e7b;
  --text-main: #2d3748;
  --text-muted: #718096;
  --bg-page: #f8fafc;
  --card-bg: #ffffff;
  --success: #2e7d32;
  --success-bg: #edf7ed;
  --error: #d32f2f;
  --error-bg: #fdeded;
  --warning: #ed6c02;
  --warning-bg: #fff4e5;
  --radius: 12px;
  --shadow: 0 4px 15px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.6;
  padding: 20px;
}

.container {
  max-width: 1050px;
  margin: 0 auto;
  background: var(--card-bg);
  padding: 30px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* Header */
.exercise-header {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 25px;
  border-bottom: 2px solid #edf2f7;
  padding-bottom: 20px;
}

.exercise-number {
  background: #f39200;
  color: #fff;
  font-weight: 800;
  font-size: 2rem;
  width: 54px;
  height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  flex-shrink: 0;
  box-shadow: 0 3px 6px rgba(243, 146, 0, 0.3);
}

.header-content h1 {
  font-size: 1.65rem;
  color: #1a202c;
  margin-bottom: 6px;
}

.header-instructions {
  font-size: 1.05rem;
  color: #4a5568;
}

/* Role Badge */
.role-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--primary-light);
  border: 2px solid var(--primary-border);
  padding: 14px 22px;
  border-radius: var(--radius);
  margin-bottom: 25px;
  flex-wrap: wrap;
  gap: 12px;
}

.role-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-dark);
}

.role-badge .pill {
  background: var(--primary-color);
  color: white;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.95rem;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.partner-link-container {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-secondary-sm {
  background: white;
  border: 1px solid #cbd5e0;
  color: #4a5568;
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  text-decoration: none;
}

.btn-secondary-sm:hover {
  background: #edf2f7;
  color: #2d3748;
}

/* Model Dialogue (Formal) */
.dialogue-card {
  background: var(--dialog-bg);
  border: 1px solid var(--dialog-border);
  border-left: 6px solid #0088cc;
  padding: 18px 22px;
  border-radius: 8px;
  margin-bottom: 30px;
}

.dialogue-card h3 {
  color: var(--dialog-text);
  font-size: 1.05rem;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.dialogue-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  font-size: 0.98rem;
}

.dialog-line {
  background: rgba(255, 255, 255, 0.7);
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid rgba(0, 136, 204, 0.15);
}

.dialog-line strong {
  color: #0070ba;
  display: inline-block;
  min-width: 25px;
}

/* Workspace Grid */
.workspace-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 25px;
  margin-bottom: 30px;
}

@media (max-width: 768px) {
  .workspace-grid {
    grid-template-columns: 1fr;
  }
}

.column-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.03);
  display: flex;
  flex-direction: column;
}

.column-header {
  padding: 14px 18px;
  font-weight: 700;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.column-header.dictation {
  background: #f1f8db;
  color: #4d6800;
  border-bottom: 2px solid #d4e899;
}

.column-header.writing {
  background: #f0f7ff;
  color: #0b5394;
  border-bottom: 2px solid #c8e1fb;
}

.column-body {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

/* Dictation list items */
.surname-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: #fafbfc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  transition: all 0.2s;
}

.surname-item:hover {
  background: #f8faf0;
  border-color: #cddc39;
}

.surname-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.item-index {
  background: #e2e8f0;
  color: #4a5568;
  font-weight: 700;
  font-size: 0.85rem;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.surname-text {
  font-size: 1.15rem;
  font-weight: 600;
  color: #1a202c;
  letter-spacing: 0.3px;
}

.spell-hint-btn {
  background: #edf2f7;
  border: none;
  color: #4a5568;
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 0.8rem;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.2s;
}

.spell-hint-btn:hover {
  background: #e2e8f0;
  color: #1a202c;
}

.spelling-breakdown {
  font-family: monospace;
  font-size: 0.9rem;
  color: #638000;
  font-weight: 700;
  letter-spacing: 1px;
  margin-top: 4px;
  display: none;
  padding-left: 38px;
}

.spelling-breakdown.active {
  display: block;
}

/* Writing Inputs */
.input-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-bottom: 8px;
  border-bottom: 1px dashed #e2e8f0;
}

.input-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.input-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.input-field {
  flex: 1;
  padding: 10px 14px;
  border: 2px solid #cbd5e0;
  border-radius: 8px;
  font-size: 1.05rem;
  font-weight: 500;
  transition: all 0.2s;
  outline: none;
}

.input-field:focus {
  border-color: #3182ce;
  box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.15);
}

.input-field.is-valid {
  border-color: var(--success);
  background-color: var(--success-bg);
}

.input-field.is-warning {
  border-color: var(--warning);
  background-color: var(--warning-bg);
}

.input-field.is-invalid {
  border-color: var(--error);
  background-color: var(--error-bg);
}

.status-icon {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.item-feedback {
  font-size: 0.85rem;
  padding-left: 36px;
  margin-top: 2px;
  min-height: 18px;
}

.item-feedback.feedback-ok {
  color: var(--success);
  font-weight: 600;
}

.item-feedback.feedback-warn {
  color: var(--warning);
  font-weight: 600;
}

.item-feedback.feedback-err {
  color: var(--error);
  font-weight: 600;
}

/* Actions Section */
.actions-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 15px;
  padding-top: 20px;
  border-top: 2px solid #edf2f7;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 13px 28px;
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(125, 161, 0, 0.35);
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 6px 14px rgba(125, 161, 0, 0.4);
}

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

.btn-secondary {
  background: #f1f5f9;
  color: #475569;
  border: 1px solid #cbd5e1;
  padding: 12px 22px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-secondary:hover {
  background: #e2e8f0;
  color: #1e293b;
}

/* Results Box */
.results-card {
  margin-top: 25px;
  padding: 20px;
  border-radius: var(--radius);
  background: #ffffff;
  border: 2px solid #e2e8f0;
  display: none;
  animation: slideDown 0.3s ease-out forwards;
}

.results-card.visible {
  display: block;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  flex-wrap: wrap;
  gap: 10px;
}

.score-badge {
  font-size: 1.3rem;
  font-weight: 800;
  padding: 6px 18px;
  border-radius: 30px;
}

.score-perfect {
  background: var(--success-bg);
  color: var(--success);
  border: 2px solid var(--success);
}

.score-good {
  background: var(--warning-bg);
  color: var(--warning);
  border: 2px solid var(--warning);
}

.score-low {
  background: var(--error-bg);
  color: var(--error);
  border: 2px solid var(--error);
}

.results-message {
  font-size: 1.05rem;
  color: #4a5568;
}

/* Toast message for link copying */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: #1e293b;
  color: #ffffff;
  padding: 12px 20px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  font-size: 0.95rem;
  z-index: 1000;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.3s ease;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* Hub / Landing Styles */
.hub-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin: 35px 0;
}

@media (max-width: 640px) {
  .hub-grid {
    grid-template-columns: 1fr;
  }
}

.hub-card {
  border: 2px solid #e2e8f0;
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  background: white;
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hub-card:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.hub-card-title {
  font-size: 1.4rem;
  color: #1a202c;
  font-weight: 700;
  margin-bottom: 10px;
}

.hub-card-desc {
  color: #718096;
  font-size: 0.95rem;
  margin-bottom: 20px;
}

.hub-btn {
  display: block;
  background: var(--primary-color);
  color: white;
  text-decoration: none;
  font-weight: 700;
  padding: 12px 20px;
  border-radius: 8px;
  transition: background 0.2s;
  margin-bottom: 10px;
}

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