:root {
  --black: #0a0a0a;
  --white: #ffffff;
  --gray-50: #f7f7f7;
  --gray-100: #f1f1f1;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-500: #737373;
  --gray-700: #404040;
  --gray-900: #171717;
  --success: #1f9d55;
  --warning: #b7791f;
  --danger: #c53030;
  --positive: #16a34a;
  --negative: #dc2626;
  --neutral: #2563eb;
  --icon-default: #374151;
  --icon-muted: #6b7280;
  --icon-accent: #1d4ed8;
  --radius: 14px;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--white);
  color: var(--black);
  line-height: 1.55;
}

body {
  min-height: 100vh;
}

.page {
  max-width: 920px;
  margin: 0 auto;
  padding: 16px 14px 92px;
  animation: pageFadeIn 320ms ease;
}

@keyframes pageFadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-header h1 {
  margin: 0;
  font-size: 1.6rem;
  line-height: 1.2;
}

.page-header p {
  margin: 8px 0 0;
  color: var(--gray-500);
}

.section {
  margin-top: 18px;
}

.section h2 {
  margin: 0 0 10px;
  font-size: 1.05rem;
}

.card {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.03);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
  animation: cardIn 300ms ease;
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  border-color: var(--gray-300);
}

.card + .card {
  margin-top: 10px;
}

.row {
  display: flex;
  gap: 10px;
}

.row.wrap {
  flex-wrap: wrap;
}

.grid {
  display: grid;
  gap: 10px;
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

.label {
  color: var(--gray-700);
  font-size: 0.92rem;
  margin-bottom: 6px;
}

input,
select,
textarea,
button {
  font: inherit;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--gray-300);
  background: var(--white);
  color: var(--black);
  border-radius: 10px;
  padding: 10px 12px;
}

textarea {
  min-height: 120px;
  resize: vertical;
}

button {
  border: 1px solid var(--black);
  background: var(--black);
  color: var(--white);
  border-radius: 10px;
  padding: 10px 14px;
  cursor: pointer;
  transition: background-color 120ms ease, border-color 120ms ease, color 120ms ease, transform 120ms ease;
}

button.secondary {
  background: var(--white);
  color: var(--black);
  border-color: var(--gray-300);
}

button.ghost {
  background: transparent;
  color: var(--black);
  border-color: var(--gray-300);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

button:active:not(:disabled) {
  transform: translateY(1px);
}

/* Semantic feedback colors for interactions */
button.tone-positive:active:not(:disabled) {
  background: var(--positive);
  border-color: var(--positive);
  color: var(--white);
}

button.tone-negative:active:not(:disabled) {
  background: var(--negative);
  border-color: var(--negative);
  color: var(--white);
}

button.tone-neutral:active:not(:disabled) {
  background: var(--neutral);
  border-color: var(--neutral);
  color: var(--white);
}

.option-list {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.choice-btn {
  text-align: left;
  border: 1px solid var(--gray-300);
  background: var(--white);
  color: var(--black);
}

/* Fix selected option contrast in onboarding */
.choice-btn.is-selected {
  background: var(--black);
  border-color: var(--black);
  color: var(--white);
}

.stat {
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  padding: 12px;
  background: var(--white);
}

.stat .num {
  font-weight: 700;
  font-size: 1.35rem;
}

.stat .txt {
  color: var(--gray-500);
  font-size: 0.86rem;
}

.nav {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--white);
  border-top: 1px solid var(--gray-200);
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  z-index: 10;
}

.nav a {
  text-decoration: none;
  color: var(--gray-500);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 8px 4px;
  font-size: 0.72rem;
}

.nav a .icon {
  color: var(--icon-muted);
}

.nav a:hover {
  color: var(--gray-700);
}

.nav a:hover .icon {
  color: var(--icon-default);
}

.nav a.is-active {
  color: var(--black);
}

.nav a.is-active .icon {
  color: var(--icon-accent);
}

.icon {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
  color: var(--icon-default);
}

.icon.fill {
  fill: currentColor;
  stroke: none;
}

.inline-icon {
  width: 18px;
  height: 18px;
  vertical-align: text-bottom;
  margin-right: 4px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
  color: var(--icon-default);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  border: 1px solid var(--gray-300);
  border-radius: 999px;
  padding: 3px 8px;
  font-size: 0.75rem;
  color: var(--gray-700);
  background: var(--white);
}

.badge .icon,
.badge .inline-icon {
  color: var(--icon-accent);
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(255, 255, 255, 0.98);
  z-index: 30;
  display: none;
}

.overlay.is-open {
  display: block;
  animation: overlayFade 200ms ease;
}

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

.overlay-panel {
  max-width: 920px;
  margin: 0 auto;
  min-height: 100vh;
  padding: 16px 14px 24px;
  animation: overlaySlide 240ms ease;
}

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

.overlay-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.lesson-card {
  min-height: 240px;
}

.bar-wrap {
  display: flex;
  gap: 8px;
  align-items: flex-end;
  min-height: 110px;
}

.bar {
  flex: 1;
  background: var(--gray-900);
  border-radius: 8px 8px 4px 4px;
}

.small {
  font-size: 0.86rem;
  color: var(--gray-500);
}

.overview-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.overview-item {
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  background: var(--white);
  padding: 10px;
}

.overview-item .k {
  font-size: 0.76rem;
  color: var(--gray-500);
}

.overview-item .v {
  font-size: 1rem;
  font-weight: 700;
  margin-top: 3px;
}

.overview-cta {
  margin-top: 10px;
}

.pulse-card {
  background: linear-gradient(180deg, #fcfcfc 0%, #f7f7f8 100%);
}

.pulse-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.pulse-head h2 {
  margin: 0;
}

.sparkline {
  width: 100%;
  height: 78px;
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  background: var(--white);
}

.sparkline-line {
  fill: none;
  stroke: var(--neutral);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.mini-bars {
  margin-top: 10px;
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 6px;
}

.mini-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.mini-col span {
  font-size: 0.68rem;
  color: var(--gray-500);
}

.mini-bar {
  width: 100%;
  max-width: 20px;
  border-radius: 5px 5px 3px 3px;
  background: linear-gradient(180deg, var(--neutral), #4f83ff);
}

.goal-wrap {
  margin-top: 12px;
}

.goal-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--gray-700);
  margin-bottom: 5px;
}

.goal-track {
  height: 8px;
  border-radius: 999px;
  background: var(--gray-200);
  overflow: hidden;
}

.goal-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--positive), var(--neutral));
}

/* Learn page redesign */
.learn-hero {
  background: linear-gradient(180deg, #fafafa 0%, #f3f4f6 100%);
}

.learn-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.lesson-card-ui {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 10px;
  align-items: start;
}

.lesson-card-ui h3 {
  margin: 0;
  font-size: 1.02rem;
}

.lesson-card-ui p {
  margin: 4px 0 0;
  color: var(--gray-700);
  font-size: 0.9rem;
}

.lesson-visual {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--gray-200);
  background: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
}

.lesson-meta {
  min-width: 0;
}

.lesson-actions {
  grid-column: 1 / -1;
  margin-top: 6px;
}

.lesson-actions button {
  width: 100%;
  border-radius: 12px;
  font-weight: 600;
}

.badge-done {
  border-color: rgba(22, 163, 74, 0.4);
  color: var(--positive);
  background: rgba(22, 163, 74, 0.08);
}

.lesson-completed {
  border-color: rgba(22, 163, 74, 0.4);
  background: linear-gradient(180deg, rgba(22, 163, 74, 0.08), rgba(22, 163, 74, 0.03));
}

.lesson-violet .lesson-visual {
  background: rgba(139, 92, 246, 0.12);
}

.lesson-blue .lesson-visual {
  background: rgba(37, 99, 235, 0.12);
}

.lesson-emerald .lesson-visual {
  background: rgba(22, 163, 74, 0.12);
}

.lesson-amber .lesson-visual {
  background: rgba(245, 158, 11, 0.16);
}

.lesson-cyan .lesson-visual {
  background: rgba(6, 182, 212, 0.14);
}

.learn-player-panel {
  max-width: 760px;
}

.lesson-player-card {
  max-width: 760px;
}

.lesson-player-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 14px;
  margin-bottom: 8px;
}

/* Tools redesign */
.tools-hero {
  background: linear-gradient(180deg, #fbfbfb, #f2f4f7);
}

.tools-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.tools-tab {
  white-space: nowrap;
  background: var(--white);
  border: 1px solid var(--gray-300);
  color: var(--gray-700);
  padding: 8px 12px;
  border-radius: 999px;
  transition: transform 120ms ease, background-color 120ms ease, color 120ms ease, border-color 120ms ease;
}

.tools-tab:hover {
  transform: translateY(-1px);
}

.tools-tab.is-active {
  background: var(--black);
  border-color: var(--black);
  color: var(--white);
}

.tools-grid-upgraded {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.tool-card-v2 {
  text-align: left;
  background: var(--white);
  border: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 168px;
}

.tool-card-v2 h3 {
  margin: 0;
  font-size: 1rem;
}

.tool-card-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
}

.tool-icon-wrap {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(180deg, #eef2ff, #e5edff);
  border: 1px solid #cbd5ff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tool-icon-wrap .icon,
.tool-icon-wrap .inline-icon {
  color: var(--icon-accent);
}

.tool-card-v2:hover .tool-icon-wrap {
  background: linear-gradient(180deg, #dbe8ff, #d3e1ff);
  border-color: #9ab5ff;
}

.tool-card-v2 h3 {
  color: var(--gray-900);
}

.tool-card-v2 .small {
  color: var(--gray-700);
}

.tools-overlay-top #toolBack .inline-icon,
.tools-overlay-top #toolClose .inline-icon {
  color: var(--icon-accent);
}

.tool-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.tools-overlay-panel {
  max-width: 920px;
}

.tools-overlay-top {
  gap: 10px;
}

.tools-overlay-top #toolBack {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.tool-panel {
  max-width: 760px;
  margin: 0 auto;
}

.switch-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  padding: 8px 10px;
  margin-bottom: 8px;
  background: var(--white);
}

.switch-btn {
  width: auto;
  min-width: 66px;
  border-radius: 999px;
  padding: 6px 10px;
  background: var(--gray-100);
  color: var(--gray-700);
  border-color: var(--gray-300);
}

.switch-btn.is-on {
  background: var(--positive);
  color: var(--white);
  border-color: var(--positive);
}

.deepwork-panel {
  position: relative;
  overflow: hidden;
}

.deepwork-panel::before {
  content: '';
  position: absolute;
  inset: -30% -20% auto -20%;
  height: 120px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.15), transparent 70%);
  animation: breathe 4s ease-in-out infinite;
}

.home-layout {
  display: block;
}

.home-main,
.home-side {
  min-width: 0;
}

@keyframes breathe {
  0%, 100% { transform: scale(0.95); opacity: 0.6; }
  50% { transform: scale(1.05); opacity: 1; }
}

.action-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  text-decoration: none;
  border: 1px solid var(--black);
  background: var(--black);
  color: var(--white);
  border-radius: 10px;
  padding: 0 12px;
  font-weight: 600;
}

.action-link.tone-positive {
  border-color: var(--positive);
  background: var(--positive);
}

.action-link.tone-negative {
  border-color: var(--negative);
  background: var(--negative);
}

.action-link.tone-neutral {
  border-color: var(--neutral);
  background: var(--neutral);
}

.device-sync-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.device-card {
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  background: var(--white);
  padding: 10px;
}

.device-status {
  border: 1px solid var(--gray-300);
  border-radius: 999px;
  padding: 2px 8px;
  font-size: 0.72rem;
}

.device-status.online {
  border-color: rgba(22, 163, 74, 0.35);
  color: var(--positive);
  background: rgba(22, 163, 74, 0.08);
}

.device-status.offline {
  border-color: rgba(220, 38, 38, 0.35);
  color: var(--negative);
  background: rgba(220, 38, 38, 0.08);
}

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

  .device-sync-grid {
    grid-template-columns: 1fr;
  }

  .mini-bars {
    gap: 4px;
  }

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

  .tools-grid-upgraded {
    grid-template-columns: 1fr;
  }
}

.hidden {
  display: none !important;
}

/* Onboarding layout and transitions */
body[data-page="onboarding"] .page {
  max-width: 560px;
  min-height: 100svh;
  padding: 16px 14px 110px;
}

.onboarding-shell {
  width: 100%;
  min-height: calc(100svh - 126px);
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 12px;
}

.onboarding-top {
  padding: 4px 2px;
}

.onboarding-top h1 {
  margin: 4px 0 0;
  font-size: 1.35rem;
  line-height: 1.25;
}

.onboarding-middle {
  display: flex;
  align-items: center;
  justify-content: center;
}

.onboarding-card {
  width: 100%;
}

.onboarding-actions {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.97);
  border-top: 1px solid var(--gray-200);
  backdrop-filter: blur(4px);
}

.onboarding-actions-inner {
  max-width: 560px;
  margin: 0 auto;
  padding: 10px 14px calc(10px + env(safe-area-inset-bottom));
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.onboarding-actions button {
  padding: 11px 10px;
}

.onboarding-card.step-next {
  animation: onboardingStepNext 220ms ease;
}

.onboarding-card.step-back {
  animation: onboardingStepBack 220ms ease;
}

@keyframes onboardingStepNext {
  from {
    opacity: 0;
    transform: translateX(14px) translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateX(0) translateY(0);
  }
}

@media (min-width: 768px) {
  .onboarding-actions {
    position: static;
    border-top: none;
    background: transparent;
    backdrop-filter: none;
  }

  .onboarding-actions-inner {
    max-width: 560px;
    margin-top: 10px;
    padding: 0;
  }

  body[data-page="onboarding"] .page {
    padding-bottom: 16px;
  }
}

/* Desktop app shell: left sidebar + content area */
@media (min-width: 1024px) {
  body:not([data-page="onboarding"]) {
    background: var(--gray-100);
  }

  body:not([data-page="onboarding"]) .nav {
    top: 0;
    bottom: 0;
    right: auto;
    width: 88px;
    border-top: none;
    border-right: 1px solid var(--gray-200);
    grid-template-columns: 1fr;
    align-content: start;
    padding-top: 18px;
    gap: 6px;
    box-shadow: 2px 0 18px rgba(0, 0, 0, 0.04);
  }

  body:not([data-page="onboarding"]) .nav a {
    min-height: 56px;
    padding: 8px 6px;
  }

  body:not([data-page="onboarding"]) .page {
    margin: 16px 16px 16px 104px;
    width: calc(100vw - 126px);
    max-width: none;
    min-height: calc(100vh - 40px);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 16px;
    box-shadow: var(--shadow);
    padding: 20px 20px 26px;
  }

  body[data-page="home"] #homeRoot {
    max-width: none;
  }

  body[data-page="home"] .home-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.6fr) minmax(330px, 1fr);
    gap: 16px;
    align-items: start;
  }

  body[data-page="home"] .home-side {
    position: sticky;
    top: 20px;
  }

  body[data-page="home"] .home-stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  body[data-page="learn"] .learn-grid,
  body[data-page="tools"] .tools-grid-upgraded {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@keyframes onboardingStepBack {
  from {
    opacity: 0;
    transform: translateX(-14px) translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateX(0) translateY(0);
  }
}