/* App navigation, refined motion, analytics, and sign-in surfaces with Theme support. */
body { overflow-x: hidden; }
main > * { animation: enter .42s ease both; }

@keyframes enter {
  from { opacity: 0; transform: translateY(9px); }
  to { opacity: 1; transform: none; }
}

/* Instant Zero-Lag Theme Switching */
html.theme-switching,
html.theme-switching *,
html.theme-switching *::before,
html.theme-switching *::after {
  transition: none !important;
  animation-duration: 0s !important;
}

button, a, .subject, .chapter-row, .plan-item, .metrics article {
  transition: transform .2s ease, box-shadow .2s ease, background-color .2s ease, color .2s ease, border-color .2s ease;
}

.dark-btn:hover, .timer-start:hover, .plan-form button:hover, .date-modal > button:hover, .auth-card > button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 17px rgba(76, 60, 148, 0.2);
}

.subject:hover, .metrics article:hover, .chart-card:hover, .analytics-cards article:hover {
  box-shadow: var(--shadow-hover);
}

/* Nuclear page-hidden rule for desktop & all screen sizes */
[data-page].page-hidden,
section.page-hidden,
.hero-grid.page-hidden,
.metrics.page-hidden,
.utility-grid.page-hidden,
.section-head.page-hidden,
.subject-grid.page-hidden,
.syllabus-summary-section.page-hidden,
.subject-detail-view.page-hidden,
.two-col.page-hidden,
.planner-board.page-hidden,
.analytics-page.page-hidden,
.logs-page.page-hidden,
.admin-page.page-hidden,
.page-hidden {
  display: none !important;
  visibility: hidden !important;
  height: 0 !important;
  overflow: hidden !important;
  margin: 0 !important;
  padding: 0 !important;
  border: none !important;
}

.toast {
  font-size: 14px;
  padding: 15px 20px;
  max-width: 440px;
  box-shadow: 0 12px 30px rgba(0,0,0,0.35);
}

.modal-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 14, 24, 0.75);
  backdrop-filter: blur(4px);
  z-index: 1000;
  place-items: center;
  padding: 20px;
  overflow-y: auto;
}

.modal-backdrop.open {
  display: grid;
  animation: fade .2s ease;
}

@keyframes fade { from { opacity: 0; } to { opacity: 1; } }

.date-modal {
  position: relative;
  width: min(430px, 100%);
  background: var(--card-bg);
  border-radius: 18px;
  padding: 33px;
  box-shadow: 0 25px 70px rgba(0,0,0,0.45);
  border: 1px solid var(--card-border);
  animation: pop .25s ease;
  color: var(--ink);
}

@keyframes pop { from { transform: scale(.96); } to { transform: scale(1); } }

.modal-close {
  position: absolute;
  right: 15px;
  top: 12px;
  border: 0;
  background: transparent;
  font-size: 25px;
  color: var(--subtle);
  cursor: pointer;
  transition: color 0.15s ease;
}

.modal-close:hover { color: var(--purple); }

.modal-icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: #ffead9;
  color: #df8c57;
  font-size: 22px;
}

[data-theme="dark"] .modal-icon {
  background: #3d231b;
  color: #f5a975;
}

.date-modal h2 {
  font: 700 25px 'Playfair Display';
  margin: 16px 0 8px;
  color: var(--ink);
}

.date-modal > p:not(.eyebrow) {
  font-size: 14px;
  line-height: 1.55;
  color: var(--muted);
}

.date-modal label {
  display: grid;
  gap: 7px;
  font-size: 12px;
  font-weight: bold;
  margin: 20px 0;
  color: var(--ink);
}

.date-modal input {
  padding: 12px;
  border: 1px solid var(--input-border);
  background: var(--input-bg);
  color: var(--ink);
  border-radius: 8px;
  font: 14px 'DM Sans';
  outline-color: var(--purple);
}

.date-modal > button:last-child {
  width: 100%;
  border: 0;
  border-radius: 8px;
  background: var(--purple);
  color: #fff;
  padding: 13px;
  font: 600 14px 'DM Sans';
  cursor: pointer;
  transition: all 0.2s ease;
}

.date-modal > button:last-child:hover {
  background: var(--purple-hover);
}

.analytics-page { margin: 0 0 55px; }
.analytics-title {
  display: flex;
  justify-content: space-between;
  align-items: end;
  margin-bottom: 22px;
}

.analytics-title h2 {
  font: 700 26px 'Playfair Display';
  margin: 0 0 7px;
  color: var(--ink);
}

.analytics-title p:not(.eyebrow) {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
}

.analytics-title select {
  border: 1px solid var(--input-border);
  background: var(--card-bg);
  border-radius: 8px;
  padding: 10px;
  font: 13px 'DM Sans';
  color: var(--ink);
  outline-color: var(--purple);
}

.analytics-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 22px;
}

.analytics-cards article {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px;
  background: var(--card-bg);
  border-radius: 14px;
  box-shadow: var(--shadow);
  border: 1px solid var(--card-border);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.analytics-cards article:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.analytics-cards span {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--purple-soft);
  color: var(--purple);
  font-size: 20px;
  flex-shrink: 0;
}

.analytics-cards b { font-size: 20px; font-weight: 700; color: var(--ink); display: block; }
.analytics-cards p { font-size: 12px; color: var(--muted); margin: 3px 0 0; }

/* Deep Analytics Grid: Pipeline & Priority Chapters */
.deep-analytics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 22px;
}

.pipeline-card, .priority-card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--card-border);
  display: flex;
  flex-direction: column;
}

.pipeline-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 18px;
}

.pipeline-item {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.pipeline-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}

.pipeline-meta small {
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
}

.pipeline-track {
  width: 100%;
  height: 9px;
  background: var(--progress-track, rgba(120, 120, 150, 0.15));
  border-radius: 10px;
  overflow: hidden;
}

.pipeline-fill {
  height: 100%;
  border-radius: 10px;
  background: linear-gradient(90deg, var(--purple, #685bb3), #8b7de0);
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.priority-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 18px;
  max-height: 380px;
  overflow-y: auto;
  padding-right: 4px;
}

.priority-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 14px;
  background: var(--tip-bg, rgba(120, 120, 150, 0.05));
  border: 1px solid var(--card-border);
  border-radius: 12px;
  gap: 12px;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.priority-row:hover {
  transform: translateX(3px);
  background: var(--card-hover, rgba(120, 120, 150, 0.08));
  border-color: var(--purple-soft, #685bb3);
}

.priority-info {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.priority-info b {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.priority-info small {
  font-size: 11.5px;
  color: var(--muted);
}

.priority-badge {
  font-size: 11.5px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 20px;
  flex-shrink: 0;
}

/* Growth Velocity & Learning Curve Card */
.growth-card {
  background: var(--card-bg);
  border-radius: 18px;
  padding: 26px 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--card-border);
  margin-bottom: 22px;
  position: relative;
  overflow: hidden;
  transition: box-shadow 0.2s ease;
}

.growth-card:hover {
  box-shadow: 0 14px 35px rgba(0, 0, 0, 0.1);
}

.growth-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.growth-header h3 {
  font: 700 20px 'Playfair Display', serif;
  margin: 0 0 4px;
  color: var(--ink);
}

.growth-header p:not(.eyebrow) {
  font-size: 12.5px;
  color: var(--muted);
  margin: 0;
}

.growth-metric-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.growth-tabs {
  display: flex;
  background: var(--tag-bg, rgba(120, 120, 150, 0.1));
  border-radius: 10px;
  padding: 3px;
  gap: 2px;
}

.growth-tabs button {
  border: 0;
  background: transparent;
  padding: 6px 12px;
  border-radius: 8px;
  font: 600 12px 'DM Sans', sans-serif;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.2s ease;
}

.growth-tabs button.active {
  background: var(--card-bg);
  color: var(--purple);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.growth-velocity-badge {
  font-size: 12px;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 20px;
  background: var(--mint-soft, rgba(82, 164, 126, 0.15));
  color: var(--mint, #52a47e);
  display: inline-flex;
  align-items: center;
}

.growth-chart-wrap {
  width: 100%;
  min-height: 200px;
  position: relative;
  margin: 10px 0 16px;
}

.growth-svg {
  width: 100%;
  height: 200px;
  overflow: visible;
}

.growth-dot-group {
  cursor: pointer;
}

.growth-dot {
  transition: r 0.2s ease, fill 0.2s ease, stroke-width 0.2s ease;
}

.growth-dot-group:hover .growth-dot,
.growth-dot-group:focus .growth-dot {
  r: 6.5;
  fill: #8b7de0;
  stroke: #ffffff;
  stroke-width: 3;
}

.growth-metrics-footer {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  padding-top: 16px;
  border-top: 1px solid var(--line, rgba(120, 120, 150, 0.15));
}

.growth-foot-stat {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--tip-bg, rgba(120, 120, 150, 0.04));
  border-radius: 12px;
  border: 1px solid var(--card-border);
}

.growth-foot-stat .foot-icon {
  font-size: 18px;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--card-bg);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
}

.growth-foot-stat small {
  display: block;
  font-size: 11px;
  color: var(--muted);
  font-weight: 500;
  margin-bottom: 2px;
}

.growth-foot-stat strong {
  display: block;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--ink);
}

.chart-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 20px;
  margin-bottom: 22px;
}

.chart-card, .session-history {
  background: var(--card-bg);
  border-radius: 14px;
  padding: 23px;
  box-shadow: var(--shadow);
  border: 1px solid var(--card-border);
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
}

.chart-header h3, .session-history h3 {
  font: 700 18px 'Playfair Display';
  margin: 0 0 5px;
  color: var(--ink);
}

.chart-header p, .session-history p {
  font-size: 12px;
  color: var(--muted);
  margin: 0;
}

.chart-header > b {
  font-size: 14px;
  color: var(--purple);
  background: var(--purple-soft);
  padding: 7px 11px;
  border-radius: 6px;
}

.bar-chart {
  height: 200px;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 9px;
  border-bottom: 1px solid var(--line);
  padding: 0 6px;
}

.chart-bar {
  height: 100%;
  flex: 1;
  display: flex;
  align-items: end;
  justify-content: center;
  position: relative;
}

.chart-bar i {
  display: block;
  width: 100%;
  max-width: 32px;
  min-height: 5px;
  border-radius: 6px 6px 0 0;
  background: linear-gradient(var(--purple-hover), var(--purple));
  transition: height .5s ease;
}

.chart-bar span {
  position: absolute;
  bottom: -22px;
  font-size: 10px;
  color: var(--muted);
}

.subject-chart { display: grid; gap: 15px; margin-top: 21px; }
.subject-progress { font-size: 12px; }
.subject-progress span {
  display: flex;
  justify-content: space-between;
  margin-bottom: 6px;
  color: var(--ink);
}

.subject-progress i {
  display: block;
  height: 7px;
  border-radius: 10px;
  background: var(--progress-track);
  overflow: hidden;
}

.subject-progress i:after {
  content: '';
  display: block;
  height: 100%;
  width: var(--p);
  background: var(--c);
  border-radius: 10px;
}

.session-history { margin-top: 18px; }
.session-row {
  display: flex;
  justify-content: space-between;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink);
}

.session-row:last-child { border: 0; }
.session-row small { color: var(--muted); }

.auth-screen {
  position: fixed;
  z-index: 2000;
  inset: 0;
  background: linear-gradient(135deg, var(--paper) 40%, var(--purple-soft));
  display: grid;
  place-items: center;
  padding: 22px;
}

.auth-screen.hidden { display: none; }

.auth-theme-toggle {
  position: absolute;
  top: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
  display: grid;
  place-items: center;
  font-size: 19px;
  cursor: pointer;
  color: var(--ink);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  z-index: 2010;
}

.auth-theme-toggle:hover {
  transform: scale(1.08) rotate(12deg);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.auth-card {
  width: min(420px, 100%);
  padding: 34px;
  background: var(--card-bg);
  border-radius: 20px;
  box-shadow: 0 28px 70px rgba(0,0,0,0.35);
  border: 1px solid var(--card-border);
  text-align: left;
  color: var(--ink);
}

.auth-card > .brand-mark { margin-bottom: 19px; }
.auth-card h2 {
  font: 700 28px 'Playfair Display';
  margin: 0 0 9px;
  color: var(--ink);
}

.auth-card > p:not(.eyebrow) {
  font-size: 14px;
  line-height: 1.5;
  color: var(--muted);
}

.auth-card label {
  display: grid;
  gap: 7px;
  font-size: 12px;
  font-weight: bold;
  margin: 15px 0;
  color: var(--ink);
}

.auth-card input {
  border: 1px solid var(--input-border);
  background: var(--input-bg);
  color: var(--ink);
  border-radius: 8px;
  padding: 12px;
  font: 14px 'DM Sans';
  outline-color: var(--purple);
}

.auth-card > button {
  width: 100%;
  border: 0;
  border-radius: 8px;
  padding: 12px;
  background: var(--purple);
  color: #fff;
  font: 600 14px 'DM Sans';
  cursor: pointer;
  margin-top: 5px;
  transition: all 0.2s ease;
}

.auth-card > button:hover {
  background: var(--purple-hover);
}

.auth-card .auth-switch {
  background: var(--purple-soft);
  color: var(--purple);
  margin-top: 10px;
}

.google-auth-btn {
  display: flex !important;
  align-items: center;
  justify-content: center;
  gap: 11px;
  width: 100%;
  background: var(--card-bg) !important;
  color: var(--ink) !important;
  border: 1px solid var(--line) !important;
  border-radius: 10px !important;
  padding: 11px 18px !important;
  font: 600 13.5px 'DM Sans', sans-serif !important;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  margin-top: 18px !important;
}

.google-auth-btn:hover {
  background: var(--paper) !important;
  border-color: var(--purple) !important;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.1);
}

.auth-divider {
  display: flex;
  align-items: center;
  text-align: center;
  margin: 18px 0 10px;
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--line);
}

.auth-divider span {
  padding: 0 12px;
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--subtle);
}

.auth-card small {
  display: block;
  margin-top: 14px;
  text-align: center;
  font-size: 11px;
  line-height: 1.4;
  color: var(--muted);
}

@media(max-width: 800px) {
  .analytics-cards, .chart-grid { grid-template-columns: 1fr; }
  .analytics-title { align-items: start; gap: 12px; flex-direction: column; }
}

@media(max-width: 650px) {
  .analytics-cards { grid-template-columns: 1fr; }
  .analytics-title h2 { font-size: 24px; }
  .bar-chart { height: 150px; }
  .auth-card { padding: 28px 23px; }
}