@layer reset, base, components, layout, responsive, utilities;

@layer reset {
  html {
    box-sizing: border-box;
    scroll-behavior: smooth;
  }

  *,
  *::before,
  *::after {
    box-sizing: inherit;
  }

  body,
  h1,
  h2,
  p,
  dl,
  dd,
  figure,
  ul {
    margin: 0;
  }

  ul {
    padding: 0;
    list-style: none;
  }

  img {
    display: block;
    max-width: 100%;
  }
}

@layer base {
  :root {
    color-scheme: light;
    --color-canvas: #f8f5f0;
    --color-sheet: #fffdfa;
    --color-ink: #302b29;
    --color-graphite: #59504b;
    --color-muted: #786b62;
    --color-accent: #b4412c;
    --color-accent-hover: #963522;
    --color-peach: #f4dccb;
    --color-peach-soft: #faede4;
    --color-stage: #3d302d;
    --color-stage-glow: #ffc3a5;
    --color-line: #e3dacf;
    --color-line-dark: #6a5650;
    --color-focus: #26628c;
    --color-header-scrim: rgba(248, 245, 240, 0.94);
    --shadow-phone: 0 22px 56px rgba(70, 46, 36, 0.16);
    --shadow-note: 0 12px 24px rgba(70, 46, 36, 0.18);
    --shadow-header: 0 1px 0 rgba(70, 46, 36, 0.08);
    --space-2xs: 0.25rem;
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4.5rem;
    --radius-small: 0.625rem;
    --radius-medium: 1rem;
    --radius-phone: 2.75rem;
    --page-gutter: clamp(1.25rem, 4vw, 3.5rem);
    --content-width: 76rem;
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --duration-fast: 150ms;
    --duration-base: 220ms;
  }

  body {
    min-width: 20rem;
    overflow-x: hidden;
    background: var(--color-canvas);
    color: var(--color-ink);
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    font-size: 1rem;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }

  h1,
  h2,
  strong {
    font-weight: 800;
  }

  h1,
  h2 {
    line-height: 1.08;
    letter-spacing: -0.03em;
    text-wrap: balance;
  }

  h1 {
    font-size: clamp(3rem, 6.7vw, 6rem);
  }

  h2 {
    font-size: clamp(2.25rem, 6vw, 4rem);
  }

  p,
  dd,
  figcaption span {
    color: var(--color-graphite);
    text-wrap: pretty;
  }

  a {
    color: inherit;
  }

  :focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 4px;
    border-radius: var(--radius-small);
  }

  ::selection {
    background: var(--color-peach);
    color: var(--color-ink);
  }
}

@layer components {
  .skip-link {
    position: fixed;
    inset-block-start: var(--space-md);
    inset-inline-start: var(--space-md);
    z-index: 5;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-small);
    background: var(--color-stage);
    color: var(--color-sheet);
    font-weight: 700;
    text-decoration: none;
    transform: translateY(-180%);
    transition: transform var(--duration-fast) var(--ease-out);
  }

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

  .brand {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    text-decoration: none;
  }

  .brand img {
    flex: 0 0 auto;
    border-radius: 22%;
  }

  .button,
  .nav-action {
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding-inline: 1.25rem;
    border: 1px solid transparent;
    border-radius: var(--radius-medium);
    font-weight: 750;
    line-height: 1.2;
    text-align: center;
    text-decoration: none;
    transition:
      transform var(--duration-fast) var(--ease-out),
      background-color var(--duration-base) ease,
      color var(--duration-base) ease;
  }

  .button:active,
  .nav-action:active {
    transform: scale(0.98);
  }

  .button-primary,
  .nav-action {
    background: var(--color-accent);
    color: var(--color-sheet);
  }

  .button-light {
    background: var(--color-stage-glow);
    color: var(--color-stage);
  }

  .text-link {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    font-weight: 750;
    text-decoration-color: var(--color-accent);
    text-decoration-thickness: 2px;
    text-underline-offset: 0.3em;
  }

  .text-link::after {
    content: "→";
    margin-inline-start: var(--space-xs);
    transition: transform var(--duration-fast) var(--ease-out);
  }

  .phone-frame {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-phone);
    background: var(--color-sheet);
    box-shadow: var(--shadow-phone);
  }

  .phone-frame::after {
    content: "";
    position: absolute;
    inset: 0;
    border: 0.4rem solid var(--color-sheet);
    border-radius: inherit;
    pointer-events: none;
  }

  .phone-frame img {
    width: 100%;
    height: auto;
  }

  .section-kicker,
  .eyebrow {
    color: var(--color-accent);
    font-size: 0.875rem;
    font-weight: 800;
    letter-spacing: 0.08em;
  }
}

@layer layout {
  .site-header {
    position: sticky;
    inset-block-start: 0;
    z-index: 4;
    background: var(--color-header-scrim);
    box-shadow: var(--shadow-header);
    backdrop-filter: blur(14px);
  }

  .nav-shell,
  .section-shell,
  .footer-shell,
  .proof-shell {
    width: min(100% - (2 * var(--page-gutter)), var(--content-width));
    margin-inline: auto;
  }

  .nav-shell {
    min-height: 4.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    padding-block: var(--space-xs);
  }

  .nav-shell .brand {
    gap: var(--space-xs);
    font-size: 0.9375rem;
  }

  .nav-links {
    display: none;
    align-items: center;
    gap: var(--space-xl);
  }

  .nav-links a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    color: var(--color-graphite);
    font-size: 0.9375rem;
    font-weight: 650;
    text-decoration: none;
    transition: color var(--duration-base) ease;
  }

  .nav-action {
    min-height: 44px;
    padding-inline: 0.875rem;
    font-size: 0.8125rem;
  }

  .hero {
    position: relative;
    isolation: isolate;
    overflow: hidden;
    padding-block: clamp(3rem, 8vw, 7rem) clamp(4rem, 10vw, 8rem);
  }

  .hero-shell {
    width: min(100% - (2 * var(--page-gutter)), var(--content-width));
    margin-inline: auto;
    display: grid;
    gap: var(--space-3xl);
    align-items: center;
  }

  .hero-copy,
  .hero-visual,
  .daily-copy,
  .daily-visual {
    min-width: 0;
  }

  .eyebrow {
    margin-block-end: var(--space-lg);
  }

  .hero-lede {
    max-width: 38rem;
    margin-block-start: var(--space-xl);
    font-size: clamp(1.125rem, 2vw, 1.35rem);
  }

  .hero h1 {
    display: grid;
    gap: var(--space-sm);
  }

  .hero-title-topic {
    color: var(--color-accent);
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    line-height: 1.2;
    letter-spacing: 0.02em;
  }

  .hero-actions,
  .closing-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-sm) var(--space-lg);
    margin-block-start: var(--space-xl);
  }

  .availability {
    margin-block-start: var(--space-md);
    color: var(--color-muted);
    font-size: 0.875rem;
  }

  .hero-visual {
    position: relative;
    width: min(100%, 25rem);
    justify-self: center;
  }

  .phone-frame-hero {
    transform: rotate(2.5deg);
  }

  .practice-note {
    position: absolute;
    inset-block-start: 16%;
    inset-inline-start: -0.75rem;
    width: 5.5rem;
    aspect-ratio: 1;
    display: grid;
    place-content: center;
    justify-items: center;
    border-radius: 50%;
    background: var(--color-stage);
    color: var(--color-stage-glow);
    box-shadow: var(--shadow-note);
    line-height: 1.05;
    transform: rotate(-7deg);
  }

  .practice-note span {
    color: inherit;
    font-size: 0.75rem;
    font-weight: 700;
  }

  .practice-note strong {
    font-size: 2rem;
    font-variant-numeric: tabular-nums;
  }

  .string-lines {
    position: absolute;
    inset-block-start: 12%;
    inset-inline: 0;
    z-index: -1;
    display: grid;
    gap: 0.55rem;
    transform: rotate(-4deg);
    pointer-events: none;
  }

  .string-lines span {
    display: block;
    width: 100%;
    height: 1px;
    background: var(--color-line);
  }

  .proof {
    border-block: 1px solid var(--color-line);
    background: var(--color-sheet);
  }

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

  .proof-item {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-2xs);
    padding: var(--space-lg) var(--space-md);
  }

  .proof-item:nth-child(odd) {
    border-inline-end: 1px solid var(--color-line);
  }

  .proof-item:nth-child(-n + 2) {
    border-block-end: 1px solid var(--color-line);
  }

  .proof-item strong {
    font-size: clamp(1.25rem, 5vw, 1.75rem);
    letter-spacing: -0.03em;
  }

  .proof-item span {
    color: var(--color-muted);
    font-size: 0.8125rem;
  }

  .daily {
    display: grid;
    gap: var(--space-3xl);
    align-items: center;
    padding-block: clamp(5rem, 12vw, 10rem);
  }

  #daily,
  #path,
  #fit,
  #facts,
  #privacy {
    scroll-margin-top: 5.5rem;
  }

  .daily-visual {
    width: min(100%, 23rem);
    justify-self: center;
  }

  .phone-frame-secondary {
    transform: rotate(-1.5deg);
  }

  .image-caption {
    margin-block-start: var(--space-lg);
    color: var(--color-muted);
    font-size: 0.875rem;
    text-align: center;
  }

  .section-intro,
  .path-heading > p:last-child,
  .fit-heading > p:last-child,
  .privacy-layout > div > p,
  .closing-copy > p {
    max-width: 42rem;
    margin-block-start: var(--space-lg);
    font-size: 1.0625rem;
  }

  .practice-rhythm {
    margin-block-start: var(--space-2xl);
    border-block-start: 1px solid var(--color-line);
  }

  .practice-rhythm > div {
    display: grid;
    gap: var(--space-xs);
    padding-block: var(--space-lg);
    border-block-end: 1px solid var(--color-line);
  }

  .practice-rhythm dt {
    font-size: 1.125rem;
    font-weight: 800;
  }

  .practice-rhythm dd {
    font-size: 0.975rem;
  }

  .path {
    overflow: hidden;
    padding-block: clamp(5rem, 11vw, 9rem);
    background: var(--color-peach-soft);
  }

  .path-heading > p:last-child {
    max-width: 38rem;
  }

  .screen-rail {
    width: min(100%, 90rem);
    margin-inline: auto;
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: minmax(17.5rem, 78vw);
    gap: var(--space-lg);
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    scroll-snap-type: inline mandatory;
    scrollbar-width: thin;
    scrollbar-color: var(--color-accent) transparent;
    margin-block-start: var(--space-3xl);
    padding: 0 var(--page-gutter) var(--space-xl);
  }

  .screen-rail:focus-visible {
    outline-offset: -4px;
  }

  .screen-shot {
    min-width: 0;
    scroll-snap-align: center;
  }

  .screen-shot .phone-frame {
    width: 100%;
  }

  .screen-shot figcaption {
    display: grid;
    gap: var(--space-2xs);
    margin-block-start: var(--space-lg);
  }

  .screen-shot figcaption strong {
    font-size: 1.125rem;
  }

  .screen-shot figcaption span {
    font-size: 0.9rem;
  }

  .fit {
    padding-block: clamp(5rem, 12vw, 9rem);
  }

  .fit-heading {
    max-width: 48rem;
  }

  .fit-heading .section-kicker {
    margin-block-end: var(--space-md);
  }

  .fit-grid {
    display: grid;
    gap: var(--space-lg);
    margin-block-start: var(--space-3xl);
  }

  .fit-card {
    padding: var(--space-xl);
    border: 1px solid var(--color-line);
    border-block-start: 0.25rem solid var(--color-accent);
    border-radius: var(--radius-medium);
    background: var(--color-sheet);
  }

  .fit-card h3 {
    margin: 0;
    font-size: 1.25rem;
    line-height: 1.3;
    letter-spacing: -0.02em;
    text-wrap: balance;
  }

  .fit-card p {
    margin-block-start: var(--space-md);
    font-size: 0.975rem;
  }

  .fit-action {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-sm) var(--space-lg);
    margin-block-start: var(--space-xl);
  }

  .fit-action span {
    max-width: 28rem;
    color: var(--color-muted);
    font-size: 0.875rem;
  }

  .facts {
    padding-block: clamp(5rem, 12vw, 9rem);
    border-block-start: 1px solid var(--color-line);
    background: var(--color-sheet);
  }

  .facts-heading {
    max-width: 50rem;
  }

  .facts-heading .section-kicker {
    margin-block-end: var(--space-md);
  }

  .facts-heading > p:last-child {
    max-width: 44rem;
    margin-block-start: var(--space-lg);
    font-size: 1.0625rem;
  }

  .facts-heading a {
    font-weight: 700;
    text-decoration-color: var(--color-accent);
    text-decoration-thickness: 2px;
    text-underline-offset: 0.25em;
  }

  .answer-grid {
    display: grid;
    gap: 0;
    margin-block-start: var(--space-3xl);
    border-block-start: 1px solid var(--color-line);
  }

  .answer-card {
    padding-block: var(--space-xl);
    border-block-end: 1px solid var(--color-line);
  }

  .answer-card h3 {
    margin: 0;
    font-size: 1.25rem;
    line-height: 1.3;
    letter-spacing: -0.02em;
    text-wrap: balance;
  }

  .answer-card p {
    margin-block-start: var(--space-md);
    font-size: 0.975rem;
  }

  .privacy {
    background: var(--color-stage);
    color: var(--color-sheet);
  }

  .privacy-layout {
    display: grid;
    gap: var(--space-3xl);
    padding-block: clamp(5rem, 12vw, 9rem);
  }

  .privacy-layout h2 {
    color: var(--color-sheet);
  }

  .section-kicker-dark {
    margin-block-end: var(--space-md);
    color: var(--color-stage-glow);
  }

  .privacy-layout > div > p {
    color: var(--color-stage-glow);
  }

  .privacy-layout .button {
    margin-block-start: var(--space-xl);
  }

  .privacy :focus-visible {
    outline-color: var(--color-stage-glow);
  }

  .privacy-list {
    border-block-start: 1px solid var(--color-line-dark);
  }

  .privacy-list li {
    display: grid;
    gap: var(--space-xs);
    padding-block: var(--space-lg);
    border-block-end: 1px solid var(--color-line-dark);
  }

  .privacy-list strong {
    color: var(--color-sheet);
    font-size: 1.125rem;
  }

  .privacy-list span {
    color: var(--color-stage-glow);
    font-size: 0.9375rem;
  }

  .closing {
    display: grid;
    gap: var(--space-xl);
    align-items: center;
    padding-block: clamp(5rem, 12vw, 9rem);
  }

  .closing-icon {
    width: clamp(7rem, 26vw, 12rem);
    height: auto;
    border-radius: 22%;
    box-shadow: var(--shadow-phone);
  }

  .site-footer {
    border-block-start: 1px solid var(--color-line);
    background: var(--color-sheet);
  }

  .footer-shell {
    display: grid;
    gap: var(--space-lg);
    padding-block: var(--space-xl) max(var(--space-xl), env(safe-area-inset-bottom));
  }

  .footer-shell > p,
  .footer-shell small {
    color: var(--color-muted);
    font-size: 0.875rem;
  }

  .footer-shell nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs) var(--space-lg);
  }

  .footer-shell nav a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    color: var(--color-graphite);
    font-size: 0.9rem;
    font-weight: 650;
    text-decoration-color: var(--color-accent);
    text-underline-offset: 0.25em;
  }
}

@layer responsive {
  @media (min-width: 34rem) {
    .practice-rhythm > div,
    .privacy-list li {
      grid-template-columns: minmax(8rem, 0.7fr) minmax(0, 1.3fr);
      gap: var(--space-xl);
    }

    .closing {
      grid-template-columns: auto minmax(0, 1fr);
      gap: var(--space-2xl);
    }
  }

  @media (min-width: 48rem) {
    .nav-links {
      display: flex;
    }

    .hero-shell {
      grid-template-columns: minmax(0, 1.25fr) minmax(17rem, 0.75fr);
      gap: clamp(2rem, 5vw, 5rem);
    }

    .hero-visual {
      justify-self: end;
    }

    .proof-shell {
      grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .proof-item {
      padding: var(--space-xl) clamp(1rem, 3vw, 2rem);
    }

    .proof-item:nth-child(n) {
      border-block-end: 0;
      border-inline-end: 1px solid var(--color-line);
    }

    .proof-item:last-child {
      border-inline-end: 0;
    }

    .daily {
      grid-template-columns: minmax(17rem, 0.78fr) minmax(0, 1.22fr);
      gap: clamp(3rem, 8vw, 8rem);
    }

    .daily-copy {
      grid-column: 2;
      grid-row: 1;
    }

    .daily-visual {
      grid-column: 1;
      grid-row: 1;
      justify-self: start;
    }

    .screen-rail {
      grid-auto-columns: 23rem;
      padding-inline: max(var(--page-gutter), calc((100vw - var(--content-width)) / 2));
    }

    .fit-grid {
      grid-template-columns: repeat(3, minmax(0, 1fr));
    }

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

    .answer-card {
      padding: var(--space-xl);
    }

    .answer-card:nth-child(odd) {
      padding-inline-start: 0;
      border-inline-end: 1px solid var(--color-line);
    }

    .answer-card:nth-child(even) {
      padding-inline-end: 0;
    }

    .privacy-layout {
      grid-template-columns: minmax(0, 1.05fr) minmax(19rem, 0.95fr);
      gap: clamp(3rem, 8vw, 8rem);
    }

    .footer-shell {
      grid-template-columns: auto minmax(0, 1fr) auto;
      align-items: center;
    }

    .footer-shell > p {
      display: none;
    }

    .footer-shell nav {
      justify-content: center;
    }

    .footer-shell small {
      justify-self: end;
    }
  }

  @media (min-width: 72rem) {
    .hero {
      min-height: calc(100dvh - 4.5rem);
      display: grid;
      align-items: center;
    }

    .hero-visual {
      width: 25rem;
    }

    .practice-note {
      inset-inline-start: -2.5rem;
    }

    .screen-rail {
      grid-auto-columns: 25rem;
      gap: var(--space-2xl);
    }
  }

  @media (min-width: 72rem) and (max-height: 52rem) {
    .hero {
      padding-block: 2.5rem;
    }

    .hero h1 {
      font-size: clamp(4.5rem, 6.5vw, 5.5rem);
    }

    .hero .eyebrow {
      margin-block-end: var(--space-md);
    }

    .hero-lede,
    .hero-actions {
      margin-block-start: 1.25rem;
    }

    .hero-visual {
      width: 17rem;
    }
  }

  @media (hover: hover) and (pointer: fine) {
    .button:hover,
    .nav-action:hover {
      transform: translateY(-2px);
    }

    .button-primary:hover,
    .nav-action:hover {
      background: var(--color-accent-hover);
    }

    .button-light:hover {
      background: var(--color-sheet);
    }

    .nav-links a:hover {
      color: var(--color-accent);
    }

    .text-link:hover::after {
      transform: translateX(0.25rem);
    }
  }

  @media (prefers-reduced-motion: reduce) {
    html {
      scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
    }

    .phone-frame-hero,
    .phone-frame-secondary,
    .practice-note,
    .string-lines {
      transform: none;
    }
  }
}

@layer utilities {
  .visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
  }

  @supports not (backdrop-filter: blur(1px)) {
    .site-header {
      background: var(--color-canvas);
    }
  }

  @media print {
    .site-header,
    .hero-actions,
    .closing-actions,
    .site-footer,
    .string-lines,
    .practice-note {
      display: none;
    }

    body,
    .path,
    .privacy {
      background: var(--color-sheet);
      color: var(--color-ink);
    }

    .privacy-layout h2,
    .privacy-layout > div > p,
    .privacy-list strong,
    .privacy-list span {
      color: var(--color-ink);
    }
  }
}