/* ═══════════════════════════════════════════════════════════════════════════
   index.css — Dashboard / Home page styles
   ═══════════════════════════════════════════════════════════════════════════ */

/* ─── Header ─────────────────────────────────────────────────────────────── */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 15, 11, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--clr-border);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--sp-4) var(--sp-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.brand-icon {
  font-size: 2rem;
  line-height: 1;
}

.brand-title {
  font-size: 1.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, #f1f5f9 0%, var(--clr-accent-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.03em;
}

.brand-subtitle {
  font-size: 0.72rem;
  color: var(--clr-text-muted);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.header-stats {
  display: flex;
  gap: var(--sp-3);
  align-items: center;
}

.xp-pill {
  border-color: rgba(251, 191, 36, 0.2) !important;
}

/* Overall progress bar under header */
.global-progress-bar {
  height: 2px;
  background: var(--clr-bg-surface);
  overflow: hidden;
}

.global-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--clr-accent), var(--clr-correct));
  width: 0%;
  transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─── Main Layout ─────────────────────────────────────────────────────────── */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--sp-8) var(--sp-6);
  display: flex;
  flex-direction: column;
  gap: var(--sp-8);
}

/* ─── Section headers ─────────────────────────────────────────────────────── */
.section-header {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.section-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
}

.section-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--clr-text-primary);
}

.section-desc {
  color: var(--clr-text-secondary);
  font-size: 0.9rem;
  max-width: 560px;
}

/* ─── Units Grid ──────────────────────────────────────────────────────────── */
.units-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--sp-5);
}

/* ─── Unit Card ───────────────────────────────────────────────────────────── */
.unit-card {
  background: var(--clr-bg-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
  cursor: pointer;
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-base);
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  position: relative;
}

.unit-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--clr-accent-dim) 0%, transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-base);
  border-radius: inherit;
}

.unit-card:hover {
  border-color: rgba(16, 185, 129, 0.3);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(16, 185, 129, 0.1);
  transform: translateY(-3px);
  z-index: 10;
}

.unit-card:hover::before {
  opacity: 1;
}

.unit-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--sp-3);
  position: relative;
}

.unit-number {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-accent-light);
}

.unit-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--clr-text-primary);
  line-height: 1.3;
  margin-top: var(--sp-1);
}

/* Progress ring inside card */
.unit-ring-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.unit-ring-label {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Mastery mini bar in card */
.unit-mastery-bar {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.unit-mastery-row {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.mastery-bar-track {
  flex: 1;
  height: 4px;
  background: var(--clr-bg-raised);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.mastery-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.mastery-bar-fill.m-1 {
  background: var(--clr-mastery--1);
}

.mastery-bar-fill.m0 {
  background: var(--clr-mastery-0);
}

.mastery-bar-fill.m1 {
  background: var(--clr-mastery-1);
}

.mastery-bar-fill.m2 {
  background: var(--clr-mastery-2);
}

.mastery-bar-fill.m3 {
  background: var(--clr-mastery-3);
}

.mastery-bar-count {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--clr-text-secondary);
  min-width: 20px;
  text-align: right;
}

/* Subtopic visual breakdown on card */
.unit-subtopics {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  margin-top: var(--sp-2);
}

.subtopic-status-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.subtopic-status-name {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--clr-text-secondary);
}

.subtopic-status-boxes {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
}

.subtopic-word-box {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  opacity: 0.85;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.subtopic-word-box:hover {
  opacity: 1;
  transform: scale(1.3);
  z-index: 10;
}

.subtopic-word-box.m-1 {
  background: var(--clr-mastery--1);
}

.subtopic-word-box.m0 {
  background: var(--clr-mastery-0);
}

.subtopic-word-box.m1 {
  background: var(--clr-mastery-1);
}

.subtopic-word-box.m2 {
  background: var(--clr-mastery-2);
}

.subtopic-word-box.m3 {
  background: var(--clr-mastery-3);
}

/* ─── Drawer ──────────────────────────────────────────────────────────────── */
.drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 400px;
  max-width: 100vw;
  background: var(--clr-bg-surface);
  border-left: 1px solid var(--clr-border);
  z-index: 500;
  transform: translateX(100%);
  transition: transform var(--transition-slow) cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
}

.drawer.open {
  transform: translateX(0);
  box-shadow: -8px 0 40px rgba(0, 0, 0, 0.5);
}

.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 499;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-slow);
  backdrop-filter: blur(2px);
}

.drawer-backdrop.open {
  opacity: 1;
  pointer-events: all;
}

.drawer-inner {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: var(--sp-6);
  overflow-y: auto;
  gap: var(--sp-5);
}

.drawer-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--sp-4);
}

.drawer-unit-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-accent-light);
}

.drawer-unit-name {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--clr-text-primary);
  margin-top: var(--sp-1);
}

.drawer-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-2);
}

.drawer-stats .stat-pill {
  padding: var(--sp-2) var(--sp-3);
}

.drawer-stats .stat-value {
  font-size: 1.1rem;
}

/* Subtopic list in drawer */
.subtopic-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.subtopic-item {
  background: var(--clr-bg-raised);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: var(--sp-4);
  cursor: pointer;
  transition:
    background var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.subtopic-item:hover {
  background: var(--clr-bg-hover);
  border-color: rgba(16, 185, 129, 0.3);
  transform: translateX(3px);
}

.subtopic-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--clr-text-primary);
}

.subtopic-meta {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.subtopic-count {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
}

.subtopic-study-btn {
  margin-left: auto;
  font-size: 0.75rem;
  padding: 2px 10px;
}

.drawer-actions {
  margin-top: auto;
  padding-top: var(--sp-4);
}

/* ─── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .header-stats {
    display: none;
  }

  .header-inner {
    padding: var(--sp-3) var(--sp-4);
  }

  .main-content {
    padding: var(--sp-6) var(--sp-4);
  }

  .units-grid {
    grid-template-columns: 1fr;
  }

  .drawer {
    width: 100vw;
  }
}