/* ============================================================
   Gentle Yoga With Penny - Stylesheet
   ============================================================ */

/* --- Cascade Layers --- */
@layer reset, base, layout, components, utilities;

/* ============================================================
   LAYER: Reset
   ============================================================ */
@layer reset {
  *,
  *::before,
  *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  html {
    -moz-text-size-adjust: none;
    -webkit-text-size-adjust: none;
    text-size-adjust: none;
    scroll-behavior: smooth;
  }

  body {
    min-block-size: 100dvh;
    line-height: 1.6;
  }

  img, picture, svg {
    display: block;
    max-inline-size: 100%;
    block-size: auto;
  }

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

  h1, h2, h3, h4 {
    text-wrap: balance;
  }

  p {
    text-wrap: pretty;
  }

  a {
    color: inherit;
    text-decoration-skip-ink: auto;
  }

  ul[role="list"],
  ol[role="list"] {
    list-style: none;
  }
}

/* ============================================================
   LAYER: Base - Design tokens & typography
   ============================================================ */
@layer base {
  :root {
    /* Colour palette */
    --clr-sage: #7C9082;
    --clr-teal: #5B8A8A;
    --clr-cream: #F5F1EB;
    --clr-charcoal: #2D2D2D;
    --clr-bg: #FAFAF8;
    --clr-white: #FFFFFF;

    /* Derived colours using color-mix */
    --clr-sage-light: color-mix(in oklch, var(--clr-sage), var(--clr-white) 75%);
    --clr-sage-mid: color-mix(in oklch, var(--clr-sage), var(--clr-white) 40%);
    --clr-teal-light: color-mix(in oklch, var(--clr-teal), var(--clr-white) 80%);
    --clr-teal-dark: color-mix(in oklch, var(--clr-teal), var(--clr-charcoal) 25%);
    --clr-border: color-mix(in oklch, var(--clr-sage), transparent 70%);

    /* Typography */
    --font-body: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    --font-size-base: 1.125rem;
    --font-size-sm: 0.9rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 2.5rem;
    --font-size-hero: clamp(2rem, 5vw, 3.2rem);
    --line-height-tight: 1.2;
    --line-height-normal: 1.6;
    --letter-spacing-heading: -0.02em;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* Layout */
    --max-width: 72rem;
    --content-width: 52rem;
    --gutter: clamp(1rem, 4vw, 2rem);
    --radius: 0.5rem;
    --radius-lg: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.1);
  }

  /* Dark mode */
  @media (prefers-color-scheme: dark) {
    :root {
      --clr-bg: #1a1f1c;
      --clr-charcoal: #e8e6e1;
      --clr-cream: #2a2f2c;
      --clr-white: #222722;
      --clr-sage-light: color-mix(in oklch, var(--clr-sage), #1a1f1c 60%);
      --clr-sage-mid: color-mix(in oklch, var(--clr-sage), #1a1f1c 30%);
      --clr-teal-light: color-mix(in oklch, var(--clr-teal), #1a1f1c 70%);
      --clr-border: color-mix(in oklch, var(--clr-sage), transparent 50%);
      --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
      --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
      --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.35);
    }
  }

  body {
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    color: var(--clr-charcoal);
    background-color: var(--clr-bg);
    line-height: var(--line-height-normal);
  }

  h1, h2, h3, h4 {
    line-height: var(--line-height-tight);
    letter-spacing: var(--letter-spacing-heading);
    color: var(--clr-charcoal);
  }

  h1 { font-size: var(--font-size-hero); font-weight: 700; }
  h2 { font-size: var(--font-size-2xl); font-weight: 600; }
  h3 { font-size: var(--font-size-xl); font-weight: 600; }
  h4 { font-size: var(--font-size-lg); font-weight: 600; }

  a {
    color: var(--clr-teal-dark);
    transition: color var(--transition-fast);

    &:hover {
      color: var(--clr-teal);
    }

    &:focus-visible {
      outline: 2px solid var(--clr-teal);
      outline-offset: 2px;
      border-radius: 2px;
    }
  }

  ::selection {
    background-color: var(--clr-sage-light);
    color: var(--clr-charcoal);
  }
}

/* ============================================================
   LAYER: Layout - Page structure, grid, nav
   ============================================================ */
@layer layout {
  /* Skip link */
  .skip-link {
    position: absolute;
    inset-block-start: -100%;
    inset-inline-start: var(--space-md);
    background: var(--clr-teal);
    color: var(--clr-white);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius);
    z-index: 1000;
    font-weight: 600;
    text-decoration: none;

    &:focus {
      inset-block-start: var(--space-md);
    }
  }

  /* Container */
  .container {
    max-inline-size: var(--max-width);
    margin-inline: auto;
    padding-inline: var(--gutter);
  }

  .container--narrow {
    max-inline-size: var(--content-width);
  }

  /* Site header */
  .site-header {
    background-color: var(--clr-white);
    border-block-end: 1px solid var(--clr-border);
    position: sticky;
    inset-block-start: 0;
    z-index: 100;
  }

  .site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-block: var(--space-md);
    gap: var(--space-lg);
  }

  .site-header__brand {
    text-decoration: none;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
  }

  .site-header__name {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--clr-sage);
    line-height: 1.1;
  }

  .site-header__tagline {
    font-size: var(--font-size-sm);
    color: color-mix(in oklch, var(--clr-charcoal), transparent 40%);
    line-height: 1.2;
  }

  /* Desktop nav */
  .main-nav__list {
    display: flex;
    gap: var(--space-lg);
    list-style: none;
  }

  .main-nav__link {
    text-decoration: none;
    font-weight: 500;
    padding-block: var(--space-xs);
    position: relative;
    color: var(--clr-charcoal);
    transition: color var(--transition-fast);

    &::after {
      content: "";
      position: absolute;
      inset-block-end: 0;
      inset-inline-start: 0;
      inline-size: 0;
      block-size: 2px;
      background-color: var(--clr-sage);
      transition: inline-size var(--transition-base);
    }

    &:hover::after,
    &[aria-current="page"]::after {
      inline-size: 100%;
    }

    &[aria-current="page"] {
      color: var(--clr-sage);
    }
  }

  /* Mobile nav - CSS-only hamburger using checkbox hack */
  .nav-toggle {
    display: none;
  }

  .nav-toggle-label {
    display: none;
    cursor: pointer;
    padding: var(--space-sm);
    min-block-size: 44px;
    min-inline-size: 44px;
    align-items: center;
    justify-content: center;
  }

  .nav-toggle-label__icon {
    display: block;
    inline-size: 24px;
    block-size: 2px;
    background: var(--clr-charcoal);
    position: relative;
    transition: background var(--transition-fast);

    &::before,
    &::after {
      content: "";
      position: absolute;
      inline-size: 24px;
      block-size: 2px;
      background: var(--clr-charcoal);
      inset-inline-start: 0;
      transition: transform var(--transition-base);
    }

    &::before { inset-block-start: -7px; }
    &::after { inset-block-start: 7px; }
  }

  /* Hamburger active state */
  .nav-toggle:checked ~ .nav-toggle-label .nav-toggle-label__icon {
    background: transparent;

    &::before {
      inset-block-start: 0;
      transform: rotate(45deg);
    }

    &::after {
      inset-block-start: 0;
      transform: rotate(-45deg);
    }
  }

  @media (max-width: 768px) {
    .nav-toggle-label {
      display: flex;
    }

    .main-nav {
      position: absolute;
      inset-block-start: 100%;
      inset-inline: 0;
      background: var(--clr-white);
      border-block-end: 1px solid var(--clr-border);
      max-block-size: 0;
      overflow: hidden;
      transition: max-block-size var(--transition-slow);
    }

    .nav-toggle:checked ~ .main-nav {
      max-block-size: 300px;
    }

    .main-nav__list {
      flex-direction: column;
      padding: var(--space-md) var(--gutter) var(--space-lg);
      gap: 0;
    }

    .main-nav__link {
      display: block;
      padding-block: var(--space-sm);
    }
  }

  /* Main content */
  .site-main {
    min-block-size: 60dvh;
  }

  /* Section spacing */
  .section {
    padding-block: var(--space-3xl);
  }

  .section--alt {
    background-color: var(--clr-cream);
  }

  .section__heading {
    text-align: center;
    margin-block-end: var(--space-sm);
  }

  .section__subheading {
    text-align: center;
    color: color-mix(in oklch, var(--clr-charcoal), transparent 35%);
    margin-block-end: var(--space-2xl);
    font-weight: 400;
  }

  /* Site footer */
  .site-footer {
    background-color: var(--clr-cream);
    border-block-start: 1px solid var(--clr-border);
    padding-block: var(--space-2xl);
  }

  .site-footer__inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    text-align: center;
  }

  @media (min-width: 768px) {
    .site-footer__inner {
      grid-template-columns: 1fr auto 1fr;
      text-align: start;
    }

    .site-footer__end {
      text-align: end;
    }
  }

  .site-footer__name {
    font-weight: 600;
    color: var(--clr-sage);
    margin-block-end: var(--space-xs);
  }

  .site-footer__contact-list {
    list-style: none;
    font-size: var(--font-size-sm);
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
  }

  .site-footer__social-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 500;
  }

  .site-footer__copy {
    font-size: var(--font-size-sm);
    color: color-mix(in oklch, var(--clr-charcoal), transparent 40%);
  }

  /* Pablo tribute */
  .pablo-tribute {
    margin-block-start: var(--space-lg);
    padding-block-start: var(--space-md);
    border-block-start: 1px solid var(--clr-border);
    text-align: center;
    font-size: var(--font-size-sm);
    color: color-mix(in oklch, var(--clr-charcoal), transparent 45%);
    font-style: italic;
  }

  .pablo-tribute__paw {
    display: inline-block;
    vertical-align: middle;
    margin-inline: 0.3em;
  }


}

/* ============================================================
   LAYER: Components - Cards, buttons, hero, form, etc.
   ============================================================ */
@layer components {
  /* ---------- Buttons ---------- */
  .btn {
    display: inline-block;
    padding: var(--space-sm) var(--space-lg);
    border: 2px solid transparent;
    border-radius: var(--radius);
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition:
      background-color var(--transition-fast),
      color var(--transition-fast),
      border-color var(--transition-fast),
      transform var(--transition-fast);
    min-block-size: 44px;
    line-height: 1.4;

    &:hover {
      transform: translateY(-1px);
    }

    &:active {
      transform: translateY(0);
    }

    &:focus-visible {
      outline: 2px solid var(--clr-teal);
      outline-offset: 2px;
    }
  }

  .btn--primary {
    background-color: var(--clr-sage);
    color: var(--clr-white);
    border-color: var(--clr-sage);

    &:hover {
      background-color: var(--clr-teal);
      border-color: var(--clr-teal);
      color: var(--clr-white);
    }
  }

  .btn--secondary {
    background-color: transparent;
    color: var(--clr-sage);
    border-color: var(--clr-sage);

    &:hover {
      background-color: var(--clr-sage);
      color: var(--clr-white);
    }
  }

  /* ---------- Hero ---------- */
  .hero {
    position: relative;
    background-color: var(--clr-cream);
    padding-block: var(--space-4xl);
    overflow: hidden;
  }

  .hero__inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
    align-items: center;
  }

  @media (min-width: 768px) {
    .hero__inner {
      grid-template-columns: 1fr 1fr;
    }
  }

  .hero__content {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
  }

  .hero__heading {
    font-size: var(--font-size-hero);
    color: var(--clr-charcoal);
  }

  .hero__subheading {
    font-size: var(--font-size-lg);
    color: color-mix(in oklch, var(--clr-charcoal), transparent 25%);
    font-weight: 400;
  }

  .hero__text {
    font-size: var(--font-size-base);
    max-inline-size: 42ch;
  }

  .hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-block-start: var(--space-sm);
  }

  .hero__image {
    border-radius: var(--radius-lg);
    aspect-ratio: 4 / 3;
    object-fit: cover;
    inline-size: 100%;
    box-shadow: var(--shadow-lg);
  }

  /* ---------- Class cards ---------- */
  .class-grid {
    container-type: inline-size;
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  @container (min-width: 500px) {
    .class-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  @container (min-width: 800px) {
    .class-grid {
      grid-template-columns: repeat(3, 1fr);
    }
  }

  /* Fallback for browsers without container queries */
  @supports not (container-type: inline-size) {
    @media (min-width: 600px) {
      .class-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (min-width: 1024px) {
      .class-grid {
        grid-template-columns: repeat(3, 1fr);
      }
    }
  }

  .class-card {
    background: var(--clr-white);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-lg);
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    overflow: hidden;
    transition:
      box-shadow var(--transition-base),
      transform var(--transition-base);
  }

  .class-card__image {
    inline-size: 100%;
    block-size: 160px;
    object-fit: cover;
  }

  .class-card__body {
    padding: var(--space-lg);
    padding-block-start: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    flex: 1;
  }

  /* Cards without images get padding on all sides */
  .class-card:not(:has(.class-card__image)) {
    padding: var(--space-lg);
  }

  .class-card:has(.class-card__image) .class-card__day {
    padding-inline: var(--space-lg);
    padding-block-start: var(--space-md);
  }

  .class-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
  }

  .class-card__day {
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--clr-teal);
  }

  .class-card__name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--clr-charcoal);
  }

  .class-card__detail {
    font-size: var(--font-size-sm);
    color: color-mix(in oklch, var(--clr-charcoal), transparent 30%);
    display: flex;
    align-items: baseline;
    gap: var(--space-xs);
  }

  .class-card__detail-icon {
    flex-shrink: 0;
    inline-size: 1em;
  }

  .class-card__price {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--clr-sage);
    margin-block-start: auto;
    padding-block-start: var(--space-sm);
  }

  .class-card__price span {
    font-size: var(--font-size-sm);
    font-weight: 400;
    color: color-mix(in oklch, var(--clr-charcoal), transparent 40%);
  }

  .class-card__notes {
    font-size: var(--font-size-sm);
    color: color-mix(in oklch, var(--clr-charcoal), transparent 25%);
    line-height: var(--line-height-normal);
  }

  .class-card__cta {
    margin-block-start: var(--space-sm);
  }

  /* ---------- About sections ---------- */
  .about-intro {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
    align-items: start;
  }

  @media (min-width: 768px) {
    .about-intro {
      grid-template-columns: 2fr 1fr;
    }
  }

  .about-intro__text {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
  }

  .about-intro__quote {
    font-size: var(--font-size-xl);
    font-style: italic;
    color: var(--clr-teal);
    border-inline-start: 3px solid var(--clr-sage);
    padding-inline-start: var(--space-lg);
    margin-block: var(--space-md);
  }

  .about-intro__image {
    border-radius: var(--radius-lg);
    aspect-ratio: 3 / 4;
    object-fit: cover;
    inline-size: 100%;
    max-inline-size: 280px;
    margin-inline: auto;
    box-shadow: var(--shadow-md);
  }

  @media (min-width: 768px) {
    .about-intro__image {
      max-inline-size: none;
      margin-inline: 0;
    }
  }

  .experience-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    padding-inline-start: 0;
  }

  .experience-list li {
    padding-inline-start: var(--space-lg);
    position: relative;

    &::before {
      content: "";
      position: absolute;
      inset-inline-start: 0;
      inset-block-start: 0.6em;
      inline-size: 8px;
      block-size: 8px;
      border-radius: 50%;
      background-color: var(--clr-sage);
    }
  }

  .bwy-section {
    background: var(--clr-white);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    margin-block-start: var(--space-2xl);
  }

  .bwy-section__heading {
    color: var(--clr-sage);
    margin-block-end: var(--space-md);
  }

  .bwy-benefits {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-block-start: var(--space-md);
  }

  .bwy-benefits li {
    padding-inline-start: var(--space-lg);
    position: relative;

    &::before {
      content: "\2713";
      position: absolute;
      inset-inline-start: 0;
      color: var(--clr-sage);
      font-weight: 700;
    }
  }

  .bwy-logo-link {
    display: block;
    margin-block-start: var(--space-xl);
    width: fit-content;
  }

  .bwy-logo {
    display: block;
    border-radius: var(--radius-md);
    width: 100px;
    height: auto;
  }

  @media (min-width: 768px) {
    .bwy-logo {
      width: 120px;
    }
  }

  /* ---------- Contact ---------- */
  .contact-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  @media (min-width: 768px) {
    .contact-layout {
      grid-template-columns: 1fr 1fr;
    }
  }

  .contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
  }

  .contact-info__item {
    display: flex;
    align-items: start;
    gap: var(--space-md);
  }

  .contact-info__icon {
    flex-shrink: 0;
    inline-size: 1.5rem;
    block-size: 1.5rem;
    color: var(--clr-sage);
    margin-block-start: 0.15em;
  }

  .contact-info__label {
    font-size: var(--font-size-sm);
    color: color-mix(in oklch, var(--clr-charcoal), transparent 35%);
    margin-block-end: 0.1em;
  }

  .contact-info__value {
    font-weight: 500;
  }

  .contact-info__value a {
    text-decoration: none;

    &:hover {
      text-decoration: underline;
    }
  }

  /* Form */
  .contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
  }

  .form-field {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
  }

  .form-field label {
    font-weight: 500;
    font-size: var(--font-size-sm);
  }

  .form-field input,
  .form-field textarea {
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius);
    background: var(--clr-white);
    color: var(--clr-charcoal);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);

    &:focus {
      outline: none;
      border-color: var(--clr-teal);
      box-shadow: 0 0 0 3px var(--clr-teal-light);
    }

    &::placeholder {
      color: color-mix(in oklch, var(--clr-charcoal), transparent 60%);
    }
  }

  .form-field textarea {
    min-block-size: 150px;
    resize: vertical;
  }

  .form-submit {
    align-self: flex-start;
  }

  .form-privacy {
    font-size: var(--font-size-sm);
    color: color-mix(in oklch, var(--clr-charcoal), transparent 35%);
  }

  .form-success {
    background: var(--clr-sage-light);
    border: 1px solid var(--clr-sage);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
  }

  /* ---------- Privacy Policy ---------- */
  .prose {
    max-inline-size: var(--content-width);
    margin-inline: auto;

    & h2 {
      margin-block-start: var(--space-2xl);
      margin-block-end: var(--space-md);
    }

    & h3 {
      margin-block-start: var(--space-xl);
      margin-block-end: var(--space-sm);
    }

    & p {
      margin-block-end: var(--space-md);
    }

    & ul, & ol {
      padding-inline-start: var(--space-xl);
      margin-block-end: var(--space-md);
    }

    & li {
      margin-block-end: var(--space-xs);
    }

    & a {
      text-decoration: underline;
    }
  }
}

/* ============================================================
   LAYER: Utilities
   ============================================================ */
@layer utilities {
  .visually-hidden {
    position: absolute;
    inline-size: 1px;
    block-size: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }

  .text-center {
    text-align: center;
  }
}

/* ============================================================
   Scroll-driven animations (progressive enhancement)
   ============================================================ */
@supports (animation-timeline: view()) {
  @media (prefers-reduced-motion: no-preference) {
    .fade-in {
      animation: fade-in-up linear both;
      animation-timeline: view();
      animation-range: entry 0% entry 30%;
    }

    @keyframes fade-in-up {
      from {
        opacity: 0;
        transform: translateY(2rem);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }
  }
}

/* Fallback: elements are visible if scroll animations aren't supported */
@supports not (animation-timeline: view()) {
  .fade-in {
    opacity: 1;
  }
}

/* ============================================================
   View Transitions (progressive enhancement)
   ============================================================ */
@view-transition {
  navigation: auto;
}

::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 200ms;
}

/* ============================================================
   Reduced motion - disable all animations and transitions
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}