:root {
  --n5-ink: #211a17;
  --n5-muted: #706762;
  --n5-paper: #fffaf4;
  --n5-paper-deep: #f7ede2;
  --n5-vermilion: #d95c42;
  --n5-vermilion-dark: #ad3f2c;
  --n5-green: #496d5b;
  --n5-line: rgba(92, 62, 45, 0.14);
  --n5-shadow: 0 24px 70px rgba(93, 57, 38, 0.12);
  --coredive-paper: #fff9f1;
  --coredive-oat: #f1e5d7;
  --coredive-sand: #e6d4c3;
  --coredive-taupe: #c9b6a7;
  --coredive-ink: #2a211d;
  --coredive-accent: #e56647;
  --coredive-accent-dark: #bd4d33;
}

html {
  scroll-behavior: smooth;
}

body {
  background:
    radial-gradient(circle at 78% 10%, rgba(230, 157, 121, 0.18), transparent 30rem),
    radial-gradient(circle at 12% 34%, rgba(103, 137, 113, 0.09), transparent 28rem),
    var(--n5-paper);
  color: var(--n5-ink);
  user-select: text;
  -webkit-user-select: text;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  opacity: 0.22;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.92' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.08'/%3E%3C/svg%3E");
}

body:not(.course-audio-ready) .audio-pill {
  visibility: hidden;
  pointer-events: none;
  opacity: 0;
  transform: translateX(-50%) translateY(1rem);
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 1200;
  transform: translateY(-180%);
  border-radius: 0.5rem;
  background: var(--n5-ink);
  color: #fff;
  padding: 0.7rem 1rem;
  text-decoration: none;
  transition: transform 180ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.global-nav {
  background: rgba(255, 250, 244, 0.82);
  border-bottom-color: var(--n5-line);
}

.nav-content {
  max-width: 1120px;
}

.nav-logo {
  color: var(--n5-ink);
  letter-spacing: -0.035em;
}

.nav-logo-img {
  border-radius: 8px;
  box-shadow: 0 6px 18px rgba(173, 63, 44, 0.2);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--n5-vermilion-dark);
}

.nav-account-btn {
  display: inline-flex;
  gap: 0.45rem;
  align-items: center;
  min-height: 2rem;
  border: 1px solid rgba(229, 102, 71, 0.2);
  border-radius: 0.6rem;
  background: rgba(255, 249, 241, 0.88);
  color: var(--coredive-ink);
  padding: 0.3rem 0.65rem 0.3rem 0.45rem;
  font-size: 0.75rem;
  font-weight: 720;
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.coredive-inline-mark {
  display: block;
  flex: 0 0 auto;
}

.nav-account-btn img,
.nav-account-btn .coredive-inline-mark {
  width: 1.25rem;
  height: 1.25rem;
}

.nav-account-btn i {
  width: 0.38rem;
  height: 0.38rem;
  border-radius: 50%;
  background: var(--coredive-taupe);
  transition: background 180ms ease, box-shadow 180ms ease;
}

.nav-account-btn.is-connected i {
  background: #5f806d;
  box-shadow: 0 0 0 3px rgba(95, 128, 109, 0.12);
}

.nav-account-btn:hover {
  border-color: rgba(229, 102, 71, 0.42);
  background: var(--coredive-paper);
  transform: translateY(-1px);
}

.app {
  max-width: 1120px;
  padding-top: calc(var(--nav-height) + 32px);
}

.n5-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(20rem, 0.88fr);
  gap: clamp(2.5rem, 7vw, 6.5rem);
  align-items: center;
  width: 100%;
  min-height: min(47rem, calc(100dvh - var(--nav-height) - 2rem));
  padding: clamp(3.5rem, 8vw, 7rem) 0 clamp(4.5rem, 9vw, 8rem);
  box-sizing: border-box;
}

.n5-hero-copy {
  position: relative;
  z-index: 1;
}

.n5-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  margin: 0 0 1.5rem;
  color: var(--n5-vermilion-dark);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.14em;
}

.n5-eyebrow::before {
  width: 1.9rem;
  height: 1px;
  content: "";
  background: currentColor;
}

.n5-hero h1 {
  max-width: 10ch;
  margin: 0;
  color: var(--n5-ink);
  font-family: "Songti SC", "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: clamp(3.5rem, 7.6vw, 6.8rem);
  font-weight: 700;
  letter-spacing: -0.075em;
  line-height: 0.98;
  text-wrap: balance;
}

.n5-hero h1 em {
  color: var(--n5-vermilion);
  font-style: normal;
}

.n5-hero-lead {
  max-width: 36rem;
  margin: 1.75rem 0 0;
  color: var(--n5-muted);
  font-size: clamp(1.05rem, 2vw, 1.22rem);
  line-height: 1.85;
  text-wrap: pretty;
}

.n5-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2.2rem;
}

.n5-primary,
.n5-secondary {
  min-height: 3.35rem;
  border-radius: 0.85rem;
  padding: 0.9rem 1.35rem;
  font-size: 0.98rem;
  font-weight: 720;
  transition: transform 220ms cubic-bezier(.2,.8,.2,1), box-shadow 220ms ease, background 220ms ease;
}

.n5-primary {
  border-color: var(--n5-vermilion);
  background: var(--n5-vermilion);
  color: #fff;
  box-shadow: 0 12px 28px rgba(173, 63, 44, 0.24);
}

.n5-primary:hover {
  border-color: var(--n5-vermilion-dark);
  background: var(--n5-vermilion-dark);
  transform: translateY(-2px);
  box-shadow: 0 16px 34px rgba(173, 63, 44, 0.28);
}

.n5-secondary {
  border-color: var(--n5-line);
  background: rgba(255, 255, 255, 0.56);
  color: var(--n5-ink);
}

.n5-secondary:hover {
  border-color: rgba(92, 62, 45, 0.28);
  background: #fff;
  transform: translateY(-2px);
}

.n5-primary:active,
.n5-secondary:active {
  transform: translateY(1px) scale(0.985);
}

.n5-primary:focus-visible,
.n5-secondary:focus-visible,
.n5-plan-choice:focus-visible,
.nav-icon-btn:focus-visible,
.kana-card:focus-visible {
  outline: 3px solid rgba(73, 109, 91, 0.34);
  outline-offset: 3px;
}

.n5-no-login {
  margin: 0.9rem 0 0;
  color: #8f837c;
  font-size: 0.8rem;
}

.n5-lesson-preview {
  position: relative;
  padding: clamp(1.4rem, 4vw, 2.2rem);
  overflow: hidden;
  border: 1px solid rgba(92, 62, 45, 0.12);
  border-radius: 2.2rem 0.9rem 2.2rem 0.9rem;
  background: rgba(255, 255, 255, 0.7);
  box-shadow: var(--n5-shadow), inset 0 1px 0 rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.n5-lesson-preview::after {
  position: absolute;
  right: -4rem;
  bottom: -5rem;
  width: 14rem;
  height: 14rem;
  border: 1px solid rgba(217, 92, 66, 0.12);
  border-radius: 50%;
  content: "";
  box-shadow: 0 0 0 2rem rgba(217, 92, 66, 0.035), 0 0 0 4rem rgba(217, 92, 66, 0.025);
}

.n5-preview-head,
.n5-preview-progress,
.n5-preview-footer {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.n5-preview-label {
  color: var(--n5-muted);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.08em;
}

.n5-preview-time {
  color: var(--n5-green);
  font-size: 0.76rem;
  font-weight: 700;
}

.n5-kana-line {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.55rem;
  margin: 2.1rem 0 1.35rem;
}

.n5-kana-line span {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  border-radius: 0.85rem;
  background: var(--n5-paper-deep);
  color: var(--n5-ink);
  font-family: "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: clamp(1.6rem, 4vw, 2.25rem);
  font-weight: 600;
}

.n5-kana-line span:first-child {
  background: var(--n5-vermilion);
  color: #fff;
  box-shadow: 0 8px 20px rgba(173, 63, 44, 0.22);
}

.n5-preview-progress {
  gap: 0.8rem;
  margin-bottom: 1.5rem;
}

.n5-preview-track {
  flex: 1;
  height: 0.42rem;
  overflow: hidden;
  border-radius: 1rem;
  background: rgba(73, 109, 91, 0.12);
}

.n5-preview-track span {
  display: block;
  width: 20%;
  height: 100%;
  border-radius: inherit;
  background: var(--n5-green);
}

.n5-preview-progress strong {
  color: var(--n5-green);
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
}

.n5-preview-footer {
  align-items: flex-start;
  padding-top: 1.15rem;
  border-top: 1px solid var(--n5-line);
}

.n5-preview-footer strong {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.95rem;
}

.n5-preview-footer p {
  max-width: 23rem;
  margin: 0;
  color: var(--n5-muted);
  font-size: 0.82rem;
  line-height: 1.6;
}

.n5-path {
  width: 100%;
  padding: 0 0 clamp(5rem, 10vw, 8rem);
}

.n5-section-kicker {
  margin: 0 0 0.8rem;
  color: var(--n5-vermilion-dark);
  font-size: 0.78rem;
  font-weight: 720;
  letter-spacing: 0.12em;
}

.n5-section-title {
  max-width: 15ch;
  margin: 0;
  font-family: "Songti SC", "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: clamp(2.1rem, 5vw, 3.7rem);
  line-height: 1.16;
  letter-spacing: -0.055em;
  text-wrap: balance;
}

.n5-path-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(2rem, 7vw, 6rem);
  margin-top: 2.7rem;
  padding-top: 2rem;
  border-top: 1px solid var(--n5-line);
}

.n5-path-steps {
  display: grid;
  gap: 0;
}

.n5-path-step {
  display: grid;
  grid-template-columns: 3.2rem 1fr auto;
  gap: 1rem;
  align-items: start;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--n5-line);
}

.n5-path-step-number {
  color: var(--n5-vermilion-dark);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
}

.n5-path-step h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 720;
}

.n5-path-step p {
  margin: 0;
  color: var(--n5-muted);
  font-size: 0.86rem;
  line-height: 1.65;
}

.n5-path-step small {
  color: #998c84;
  font-size: 0.72rem;
  white-space: nowrap;
}

.n5-path-note {
  align-self: end;
  padding: 1.7rem;
  border-left: 3px solid var(--n5-green);
  background: rgba(73, 109, 91, 0.065);
}

.n5-path-note strong {
  display: block;
  margin-bottom: 0.55rem;
  color: var(--n5-green);
  font-size: 0.92rem;
}

.n5-path-note p {
  margin: 0;
  color: var(--n5-muted);
  font-size: 0.86rem;
  line-height: 1.75;
}

.lesson-workspace {
  width: 100%;
  margin-top: 1rem;
  padding: clamp(2rem, 6vw, 4.5rem);
  box-sizing: border-box;
  border: 1px solid rgba(92, 62, 45, 0.12);
  border-radius: 2.3rem;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--n5-shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.lesson-workspace-head {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: end;
  margin-bottom: 2.3rem;
  padding-bottom: 1.7rem;
  border-bottom: 1px solid var(--n5-line);
}

.lesson-workspace-head h2 {
  margin: 0.35rem 0 0;
  font-family: "Songti SC", "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  letter-spacing: -0.05em;
}

.lesson-workspace-head p {
  max-width: 28rem;
  margin: 0;
  color: var(--n5-muted);
  font-size: 0.88rem;
  line-height: 1.7;
}

.lesson-workspace .nav-row {
  justify-content: flex-start;
}

.lesson-workspace .dashboard-panel,
.lesson-workspace .interaction-area,
.lesson-workspace .kana-table {
  max-width: none;
}

.lesson-workspace .dashboard-panel {
  border-color: var(--n5-line);
  box-shadow: none;
  background: var(--n5-paper);
}

.lesson-workspace .kana-table {
  grid-template-columns: repeat(10, 1fr);
}

.lesson-workspace .kana-card {
  border-width: 1px;
  border-color: var(--n5-line);
  border-radius: 1rem;
  box-shadow: 0 8px 18px rgba(93, 57, 38, 0.05);
}

.lesson-workspace .kana-card:hover {
  transform: translateY(-3px);
  border-color: rgba(217, 92, 66, 0.38);
  box-shadow: 0 12px 24px rgba(93, 57, 38, 0.1);
}

.lesson-workspace .kana-card.target {
  border-color: var(--n5-vermilion);
  background: rgba(217, 92, 66, 0.07);
}

.quality-panel {
  width: 100%;
  margin-top: clamp(3rem, 8vw, 6rem);
  padding: clamp(1.5rem, 5vw, 2.8rem);
  box-sizing: border-box;
  border-top: 1px solid var(--n5-line);
  border-bottom: 1px solid var(--n5-line);
}

.quality-panel-head {
  display: grid;
  grid-template-columns: 1fr minmax(16rem, 0.75fr);
  gap: 2rem;
  align-items: end;
}

.quality-panel-head h2 {
  margin: 0.25rem 0 0;
  font-family: "Songti SC", "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: clamp(2rem, 5vw, 3.4rem);
  letter-spacing: -0.05em;
}

.quality-panel-head > p {
  margin: 0;
  color: var(--n5-muted);
  font-size: 0.86rem;
  line-height: 1.7;
}

.quality-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 2rem;
  overflow: hidden;
  border: 1px solid var(--n5-line);
  border-radius: 1rem;
  background: var(--n5-line);
}

.quality-metrics article {
  display: grid;
  gap: 0.35rem;
  min-width: 0;
  background: var(--n5-paper);
  padding: 1.25rem;
}

.quality-metrics span {
  color: var(--n5-ink);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: clamp(1.45rem, 4vw, 2.25rem);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.05em;
}

.quality-metrics small {
  color: var(--n5-muted);
  font-size: 0.75rem;
}

.n5-planner {
  position: fixed;
  inset: 0;
  z-index: 1300;
  display: none;
  place-items: center;
  padding: 1rem;
  background: rgba(33, 26, 23, 0.46);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.n5-planner.is-open {
  display: grid;
}

.divecore-account-modal {
  position: fixed;
  inset: 0;
  z-index: 1350;
  display: none;
  place-items: center;
  padding: 1rem;
  background: rgba(42, 33, 29, 0.42);
  backdrop-filter: blur(18px) saturate(0.78);
  -webkit-backdrop-filter: blur(18px) saturate(0.78);
}

.divecore-account-modal.is-open {
  display: grid;
}

body.n5-modal-open .audio-pill,
body.n5-modal-open .daily-widget,
body.account-modal-open .audio-pill,
body.account-modal-open .daily-widget {
  display: none !important;
}

.divecore-account-panel {
  display: grid;
  grid-template-columns: minmax(18rem, 0.88fr) minmax(22rem, 1.12fr);
  width: min(100%, 58rem);
  max-height: calc(100dvh - 2rem);
  overflow: auto;
  box-sizing: border-box;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 1.75rem;
  background: var(--coredive-paper);
  box-shadow: 0 34px 100px rgba(53, 37, 28, 0.26);
}

.coredive-brand-panel {
  position: relative;
  display: grid;
  align-content: space-between;
  gap: 2rem;
  min-height: 35rem;
  overflow: hidden;
  padding: clamp(2rem, 4vw, 3rem);
  background:
    radial-gradient(circle at 14% 8%, rgba(229, 102, 71, 0.18), transparent 14rem),
    linear-gradient(145deg, #fffaf3 0%, var(--coredive-oat) 100%);
  color: var(--coredive-ink);
}

.coredive-brand-panel::after {
  position: absolute;
  right: -5rem;
  bottom: -7rem;
  width: 18rem;
  height: 18rem;
  border: 1px solid rgba(229, 102, 71, 0.2);
  border-radius: 50%;
  box-shadow:
    0 0 0 2.5rem rgba(229, 102, 71, 0.045),
    0 0 0 5rem rgba(229, 102, 71, 0.025);
  content: "";
}

.coredive-lockup {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.coredive-lockup img,
.coredive-lockup .coredive-inline-mark {
  width: 2.65rem;
  height: 2.65rem;
}

.coredive-lockup span {
  color: var(--coredive-ink);
  font: 680 1.55rem/1 ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif;
  letter-spacing: -0.045em;
}

.coredive-brand-panel h2 {
  position: relative;
  z-index: 1;
  max-width: 12ch;
  margin: 0;
  font: 650 clamp(2.15rem, 4.2vw, 3.35rem)/1.08 ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif;
  letter-spacing: -0.065em;
  text-wrap: balance;
}

.coredive-kicker {
  margin: 0 0 0.65rem;
  color: var(--coredive-accent-dark);
  font: 720 0.7rem/1.2 ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  letter-spacing: 0.12em;
}

.coredive-brand-panel .divecore-account-intro {
  position: relative;
  z-index: 1;
  max-width: 27rem;
  margin: 1.2rem 0 0;
  color: rgba(42, 33, 29, 0.7);
  font-size: 0.92rem;
}

.coredive-benefits {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 0.55rem;
}

.coredive-benefits span {
  display: flex;
  gap: 0.65rem;
  align-items: center;
  color: rgba(42, 33, 29, 0.78);
  font-size: 0.78rem;
  font-weight: 650;
}

.coredive-benefits span::before {
  width: 0.48rem;
  height: 0.48rem;
  border: 2px solid var(--coredive-accent);
  border-radius: 50%;
  content: "";
}

.coredive-tagline {
  position: relative;
  z-index: 1;
  margin: 0;
  color: rgba(42, 33, 29, 0.52);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}

.coredive-account-surface {
  position: relative;
  display: grid;
  align-content: center;
  min-height: 35rem;
  padding: clamp(2rem, 5vw, 3.4rem);
  background: rgba(255, 253, 249, 0.96);
  color: var(--coredive-ink);
}

.coredive-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  display: grid;
  place-items: center;
  width: 2.35rem;
  height: 2.35rem;
  border: 1px solid rgba(42, 33, 29, 0.08);
  border-radius: 50%;
  background: var(--coredive-paper);
  color: rgba(42, 33, 29, 0.54);
  font-size: 1.1rem;
  transition: color 180ms ease, transform 180ms ease, background 180ms ease;
}

.coredive-close:hover {
  background: var(--coredive-oat);
  color: var(--coredive-ink);
  transform: rotate(5deg);
}

.coredive-form-heading {
  padding-right: 2.75rem;
}

.coredive-form-heading h3,
.coredive-connected h3,
.coredive-welcome h3 {
  margin: 0;
  color: var(--coredive-ink);
  font: 650 clamp(1.65rem, 3vw, 2.15rem)/1.16 ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif;
  letter-spacing: -0.045em;
  text-wrap: balance;
}

.coredive-form-heading > p:last-child,
.coredive-connected > p,
.coredive-welcome > p {
  margin: 0.65rem 0 0;
  color: rgba(42, 33, 29, 0.62);
  font-size: 0.84rem;
  line-height: 1.65;
}

.divecore-account-intro {
  margin: 1.35rem 0;
  color: var(--n5-muted);
  font-size: 0.88rem;
  line-height: 1.7;
}

.divecore-field {
  display: grid;
  gap: 0.45rem;
  margin-top: 1rem;
}

.divecore-field span {
  color: var(--coredive-ink);
  font-size: 0.8rem;
  font-weight: 700;
}

.divecore-field input {
  width: 100%;
  min-height: 3rem;
  box-sizing: border-box;
  border: 1px solid rgba(42, 33, 29, 0.13);
  border-radius: 0.75rem;
  background: #fffefa;
  color: var(--coredive-ink);
  padding: 0.7rem 0.85rem;
  font: inherit;
  outline: none;
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.divecore-field input:focus {
  border-color: var(--coredive-accent);
  box-shadow: 0 0 0 3px rgba(229, 102, 71, 0.12);
}

.divecore-account-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
  margin-top: 1.35rem;
}

.divecore-account-actions .coredive-primary,
.divecore-account-actions .coredive-secondary {
  width: 100%;
}

.coredive-primary,
.coredive-secondary {
  min-height: 3rem;
  border-radius: 0.75rem;
  padding: 0.75rem 1rem;
  font: 720 0.82rem/1.2 ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  transition: border-color 180ms ease, background 180ms ease, color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.coredive-primary {
  border: 1px solid var(--coredive-accent);
  background: var(--coredive-accent);
  color: #fff;
  box-shadow: 0 10px 24px rgba(193, 74, 46, 0.18);
}

.coredive-primary:hover {
  border-color: var(--coredive-accent-dark);
  background: var(--coredive-accent-dark);
  transform: translateY(-1px);
}

.coredive-secondary {
  border: 1px solid rgba(42, 33, 29, 0.14);
  background: transparent;
  color: var(--coredive-ink);
}

.coredive-secondary:hover {
  border-color: rgba(229, 102, 71, 0.38);
  background: var(--coredive-paper);
  transform: translateY(-1px);
}

.coredive-primary:focus-visible,
.coredive-secondary:focus-visible,
.coredive-close:focus-visible,
.nav-account-btn:focus-visible {
  outline: 3px solid rgba(229, 102, 71, 0.24);
  outline-offset: 2px;
}

.coredive-privacy {
  margin: 1rem 0 0;
  color: rgba(42, 33, 29, 0.5);
  font-size: 0.7rem;
  line-height: 1.55;
}

.coredive-forgot {
  display: block;
  margin: 0.65rem 0 0 auto;
  border: 0;
  background: transparent;
  color: var(--coredive-accent-dark);
  padding: 0.2rem 0;
  font-size: 0.74rem;
  font-weight: 650;
  text-underline-offset: 0.2rem;
}

.coredive-forgot:hover {
  text-decoration: underline;
}

.coredive-reset {
  display: grid;
}

.coredive-reset-actions {
  display: grid;
  gap: 0.65rem;
  margin-top: 1.2rem;
}

.coredive-tertiary {
  min-height: 2.35rem;
  border: 0;
  background: transparent;
  color: rgba(42, 33, 29, 0.62);
  padding: 0.45rem;
  font-size: 0.76rem;
  font-weight: 650;
}

.coredive-tertiary:hover {
  color: var(--coredive-accent-dark);
}

.coredive-reset-sent {
  margin: 1rem 0 0;
  border-left: 2px solid var(--coredive-accent);
  background: rgba(229, 102, 71, 0.055);
  color: rgba(42, 33, 29, 0.68);
  padding: 0.75rem 0.85rem;
  font-size: 0.76rem;
  line-height: 1.6;
}

.coredive-primary:disabled,
.coredive-secondary:disabled,
.coredive-tertiary:disabled {
  cursor: wait;
  opacity: 0.56;
  transform: none;
}

.coredive-welcome,
.coredive-connected {
  display: grid;
  justify-items: center;
  text-align: center;
}

.coredive-reset[hidden],
.coredive-reset [hidden],
.coredive-welcome[hidden],
.coredive-connected[hidden],
#divecore-signed-out[hidden] {
  display: none;
}

.coredive-welcome-mark,
.coredive-connected-mark {
  display: grid;
  place-items: center;
  width: 6.5rem;
  height: 6.5rem;
  margin-bottom: 1.4rem;
  border-radius: 50%;
  background: radial-gradient(circle, #fffefa 0 42%, var(--coredive-oat) 43% 100%);
  box-shadow: 0 16px 42px rgba(84, 59, 44, 0.12);
}

.coredive-connected-mark {
  width: 4.75rem;
  height: 4.75rem;
}

.coredive-welcome-mark img,
.coredive-welcome-mark .coredive-inline-mark { width: 4.5rem; height: 4.5rem; }
.coredive-connected-mark img,
.coredive-connected-mark .coredive-inline-mark { width: 3.15rem; height: 3.15rem; }

.coredive-welcome-details {
  display: grid;
  gap: 0.55rem;
  width: min(100%, 22rem);
  margin: 1.5rem 0;
}

.coredive-welcome-details span {
  border-bottom: 1px solid rgba(42, 33, 29, 0.08);
  padding: 0.55rem 0;
  color: rgba(42, 33, 29, 0.72);
  font-size: 0.78rem;
}

.coredive-welcome > .coredive-primary {
  width: min(100%, 18rem);
}

.coredive-connected > strong {
  margin-top: 0.75rem;
  color: var(--coredive-accent-dark);
  font-size: 0.78rem;
  font-weight: 650;
}

.coredive-connected .divecore-account-actions {
  width: 100%;
}

.divecore-account-status {
  min-height: 1.35rem;
  margin-top: 1rem;
  color: var(--n5-muted);
  font-size: 0.8rem;
  line-height: 1.55;
}

.divecore-account-status[data-tone="success"] {
  color: #5f806d;
}

.divecore-account-status[data-tone="error"] {
  color: var(--coredive-accent-dark);
}

.n5-planner-panel {
  width: min(100%, 34rem);
  max-height: calc(100dvh - 2rem);
  overflow: auto;
  box-sizing: border-box;
  border-radius: 1.6rem;
  background: var(--n5-paper);
  padding: clamp(1.5rem, 5vw, 2.4rem);
  box-shadow: 0 30px 90px rgba(33, 26, 23, 0.28);
}

.n5-planner-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 1rem;
}

.n5-planner-head h2 {
  margin: 0;
  font-family: "Songti SC", "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: 1.8rem;
  letter-spacing: -0.04em;
}

.n5-planner-close {
  width: 2.2rem;
  height: 2.2rem;
  border: 0;
  border-radius: 50%;
  padding: 0;
  background: var(--n5-paper-deep);
  color: var(--n5-muted);
  font-size: 1.15rem;
}

.n5-plan-group {
  margin-top: 1.7rem;
}

.n5-plan-group h3 {
  margin: 0 0 0.8rem;
  font-size: 0.92rem;
}

.n5-plan-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
}

.n5-plan-choice {
  min-height: 4.25rem;
  border: 1px solid var(--n5-line);
  border-radius: 0.8rem;
  background: #fff;
  color: var(--n5-ink);
  padding: 0.75rem;
  font-size: 0.82rem;
  line-height: 1.4;
}

.n5-plan-choice.is-selected {
  border-color: var(--n5-vermilion);
  background: rgba(217, 92, 66, 0.075);
  color: var(--n5-vermilion-dark);
  box-shadow: inset 0 0 0 1px var(--n5-vermilion);
}

.n5-plan-submit {
  width: 100%;
  margin-top: 1.7rem;
}

.n5-plan-result {
  display: none;
  margin-top: 1.3rem;
  border-radius: 0.85rem;
  background: rgba(73, 109, 91, 0.075);
  color: var(--n5-green);
  padding: 1rem;
  font-size: 0.86rem;
  line-height: 1.6;
}

.n5-plan-result.is-visible {
  display: block;
}

.sync-alert-box,
.footer-actions,
.seo-guide {
  max-width: 920px !important;
}

.seo-guide {
  width: 100%;
  box-sizing: border-box;
}

@media (max-width: 860px) {
  .n5-hero {
    grid-template-columns: 1fr;
    gap: 3rem;
    min-height: auto;
    padding-top: 4.5rem;
  }

  .n5-hero h1 {
    max-width: 11ch;
  }

  .n5-lesson-preview {
    width: min(100%, 34rem);
    box-sizing: border-box;
  }

  .n5-path-grid {
    grid-template-columns: 1fr;
  }

  .lesson-workspace .kana-table {
    grid-template-columns: repeat(5, 1fr);
  }

  .lesson-workspace-head {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .quality-panel-head {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .quality-metrics {
    grid-template-columns: repeat(2, 1fr);
  }

  .nav-links a:nth-last-child(-n + 2) {
    display: none;
  }

  .divecore-account-panel {
    grid-template-columns: 1fr;
    width: min(100%, 36rem);
  }

  .coredive-brand-panel,
  .coredive-account-surface {
    min-height: auto;
  }

  .coredive-brand-panel {
    gap: 1.5rem;
    padding: 1.8rem;
  }

  .coredive-brand-panel h2 {
    max-width: 16ch;
    font-size: clamp(2rem, 7vw, 2.8rem);
  }

  .coredive-benefits {
    grid-template-columns: 1fr 1fr;
  }

  .coredive-tagline {
    display: none;
  }

  .coredive-account-surface {
    padding: 2.6rem 1.8rem 1.8rem;
  }
}

@media (max-width: 560px) {
  .app {
    padding-inline: 1rem;
  }

  .n5-hero {
    padding-top: 3.3rem;
  }

  .n5-hero h1 {
    font-size: clamp(3rem, 15vw, 4.5rem);
  }

  .n5-actions {
    display: grid;
  }

  .n5-primary,
  .n5-secondary {
    width: 100%;
  }

  .n5-lesson-preview {
    border-radius: 1.5rem 0.75rem 1.5rem 0.75rem;
  }

  .n5-path-step {
    grid-template-columns: 2.4rem 1fr;
  }

  .n5-path-step small {
    grid-column: 2;
  }

  .lesson-workspace {
    margin-inline: -0.25rem;
    width: calc(100% + 0.5rem);
    padding: 1.25rem;
    border-radius: 1.45rem;
  }

  .lesson-workspace .kana-table {
    gap: 0.5rem;
  }

  .nav-links {
    display: none;
  }

  .lang-select,
  #btn-theme {
    display: none;
  }

  .n5-plan-options {
    grid-template-columns: 1fr;
  }

  .divecore-account-actions {
    grid-template-columns: 1fr;
  }

  .divecore-account-modal {
    align-items: end;
    padding: 0;
  }

  .divecore-account-panel {
    max-height: 94dvh;
    border-radius: 1.5rem 1.5rem 0 0;
  }

  .coredive-brand-panel {
    padding: 1.45rem;
  }

  .coredive-lockup img,
  .coredive-lockup .coredive-inline-mark {
    width: 2.2rem;
    height: 2.2rem;
  }

  .coredive-lockup span {
    font-size: 1.35rem;
  }

  .coredive-brand-panel h2 {
    font-size: 1.9rem;
  }

  .coredive-account-surface {
    padding: 2.5rem 1.35rem 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}