/* ============================================================
   Polestar Lifetime Learning — Main Stylesheet
   Modern CSS: custom properties, layers, grid/flexbox, fluid type
   ============================================================ */

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

/* ── Reset ─────────────────────────────────────────────────── */
@layer reset {
  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  img, picture, video { display: block; max-width: 100%; }
  input, button, textarea, select { font: inherit; }
  ul[role="list"], ol[role="list"] { list-style: none; }
  h1, h2, h3, h4 { text-wrap: balance; }
  p { text-wrap: pretty; }
}

/* ── Design tokens ──────────────────────────────────────────── */
:root {
  --color-purple:       #483f92;
  --color-purple-dark:  #28004b;
  --color-purple-light: #9999cb;
  --color-blue:         #256292;
  --color-blue-dark:    #1c3764;
  --color-text:         #333;
  --color-bg:           #fff;
  --color-border:       #ddd;
  --color-footer-bg:    #f4f4f4;
  --color-focus:        #ffbf47;

  --font-sans:   Verdana, Arial, Helvetica, sans-serif;
  --font-serif:  "Palatino Linotype", "Book Antiqua", Palatino, serif;
  --font-ui:     "Myriad Pro", "Segoe UI", sans-serif;

  --size-content: 980px;
  --radius:       4px;
  --transition:   200ms ease;

  --fs-sm:   clamp(0.75rem, 1.5vw, 0.875rem);
  --fs-base: clamp(0.875rem, 1.8vw, 1rem);
  --fs-lg:   clamp(1rem, 2.5vw, 1.25rem);
  --fs-xl:   clamp(1.25rem, 3vw, 1.75rem);
  --fs-2xl:  clamp(1.5rem, 4vw, 2.25rem);
}

/* ── Base ───────────────────────────────────────────────────── */
@layer base {
  html {
    font-size: 100%;
    scroll-behavior: smooth;
    color-scheme: light;
  }

  body {
    font-family: var(--font-sans);
    font-size: var(--fs-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.65;
  }

  /* Visible focus ring for all interactive elements */
  :focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
    border-radius: 2px;
  }

  a {
    color: var(--color-purple-dark);
    text-decoration: underline;
    text-underline-offset: 0.15em;
    transition: color var(--transition);
  }
  a:hover { color: var(--color-blue); }

  h1 { font-size: var(--fs-2xl); color: var(--color-blue-dark); margin-block-end: 0.75rem; }
  h2 { font-size: var(--fs-xl);  color: var(--color-blue-dark); margin-block-end: 0.5rem; }
  h3 { font-size: var(--fs-lg);  color: var(--color-blue-dark); margin-block-end: 0.4rem; }

  p { margin-block-end: 1rem; }
  p:last-child { margin-block-end: 0; }

  ul:not([role="list"]):not([class]) { padding-inline-start: 1.5rem; margin-block-end: 1rem; }
  li { margin-block-end: 0.25rem; }

  table {
    border-collapse: collapse;
    width: 100%;
    margin-block: 1.5rem;
    font-size: var(--fs-sm);
  }
  th, td {
    padding: 0.6rem 0.9rem;
    text-align: left;
    border: 1px solid var(--color-border);
  }
  th { background: #f0eeff; color: var(--color-blue-dark); font-weight: 700; }
  tr:nth-child(even) td { background: #fafafa; }
}

/* ── Layout ─────────────────────────────────────────────────── */
@layer layout {
  /* Skip to main content — visible on focus only */
  .skip-link {
    position: absolute;
    top: -100%;
    left: 1rem;
    z-index: 9999;
    background: var(--color-purple);
    color: #fff;
    padding: 0.6rem 1.2rem;
    font-weight: 700;
    text-decoration: none;
    border-radius: 0 0 var(--radius) var(--radius);
    transition: top 0.1s;
  }
  .skip-link:focus { top: 0; }

  .site-header {
    background: var(--color-bg);
    border-block-end: 2px solid var(--color-border);
  }

  .header-inner {
    max-width: var(--size-content);
    margin-inline: auto;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 2rem;
  }

  .logo img { height: 90px; width: auto; }

  .tagline {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: var(--fs-lg);
    color: var(--color-blue-dark);
    flex: 1;
    text-align: right;
  }

  .site-content {
    max-width: var(--size-content);
    margin-inline: auto;
    padding: 2rem 1.5rem;
  }

  .site-footer {
    background: var(--color-footer-bg);
    border-block-start: 1px solid var(--color-border);
    margin-block-start: 3rem;
  }

  .footer-inner {
    max-width: var(--size-content);
    margin-inline: auto;
    padding: 1.5rem;
    font-size: var(--fs-sm);
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 2rem;
    align-items: center;
    justify-content: space-between;
  }
}

/* ── Navigation ─────────────────────────────────────────────── */
@layer components {
  .site-nav {
    background: var(--color-purple);
    position: sticky;
    top: 0;
    z-index: 100;
  }

  .nav-inner {
    max-width: var(--size-content);
    margin-inline: auto;
    padding-inline: 1.5rem;
    display: flex;
    align-items: stretch;
    justify-content: space-between;
  }

  /* Hamburger toggle — hidden on desktop */
  .nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.75rem 0.5rem;
    color: #fff;
    flex-direction: column;
    gap: 5px;
    align-items: center;
    justify-content: center;
    align-self: center;
  }

  .nav-toggle-bar {
    display: block;
    width: 24px;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
  }

  /* Animate hamburger → X when open */
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .nav-list {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    gap: 0;
  }

  .nav-item > a {
    display: block;
    padding: 0.75rem 1rem;
    color: #fff;
    text-decoration: none;
    font-family: var(--font-ui);
    font-size: var(--fs-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    white-space: nowrap;
    transition: background var(--transition);
  }

  .nav-item > a:hover,
  .nav-item > a:focus-visible {
    background: var(--color-purple-light);
    color: #fff;
    outline-offset: -3px;
  }

  .nav-item.active > a,
  .nav-item > a[aria-current="page"] {
    background: var(--color-purple-dark);
    color: #fff;
  }

  /* Dropdown */
  .nav-item.has-dropdown { position: relative; }

  .dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--color-purple);
    min-width: 240px;
    list-style: none;
    box-shadow: 0 6px 16px rgb(0 0 0 / 0.3);
    z-index: 200;
    border-top: 2px solid var(--color-purple-light);
  }

  .dropdown li:not(:last-child) {
    border-block-end: 1px solid rgb(255 255 255 / 0.1);
  }

  .dropdown a {
    display: block;
    padding: 0.65rem 1rem;
    color: #fff;
    text-decoration: none;
    font-family: var(--font-ui);
    font-size: var(--fs-sm);
    font-weight: 600;
    white-space: nowrap;
    transition: background var(--transition);
  }

  .dropdown a:hover,
  .dropdown a:focus-visible {
    background: var(--color-purple-light);
    outline-offset: -3px;
  }

  .dropdown a[aria-current="page"] {
    background: var(--color-purple-dark);
  }

  /* Show on hover + focus-within for keyboard navigation */
  .nav-item.has-dropdown:hover .dropdown,
  .nav-item.has-dropdown:focus-within .dropdown {
    display: block;
  }

  /* ── Slideshow ────────────────────────────────────────────── */
  .slideshow { overflow: hidden; position: relative; }

  .swiper {
    width: 100%;
    aspect-ratio: 938 / 391;
    max-height: 391px;
  }

  .swiper-slide {
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    display: flex;
    align-items: flex-end;
    padding: 1.5rem 2rem;
  }

  .slide-caption {
    font-family: var(--font-serif);
    font-style: italic;
    font-weight: 700;
    font-size: var(--fs-l);
    color: var(--color-blue-dark);
    background: rgb(255 255 255 / 0.3);
    padding: 0.4rem 0.85rem;
    border-radius: var(--radius);
    backdrop-filter: blur(3px);
    max-width: 80%;
  }

  .swiper-pagination-bullet {
    background: #fff;
    opacity: 0.6;
  }
  .swiper-pagination-bullet-active {
    background: var(--color-purple);
    opacity: 1;
  }

  /* Slideshow pause button */
  .slideshow-pause {
    position: absolute;
    bottom: 0.75rem;
    right: 0.75rem;
    z-index: 10;
    background: rgb(0 0 0 / 0.45);
    color: #fff;
    border: 1px solid rgb(255 255 255 / 0.4);
    border-radius: var(--radius);
    padding: 0.3rem 0.6rem;
    font-size: var(--fs-sm);
    cursor: pointer;
    transition: background var(--transition);
    line-height: 1;
  }
  .slideshow-pause:hover { background: rgb(0 0 0 / 0.7); }

  /* ── Page content ─────────────────────────────────────────── */
  .welcome { padding-block: 2rem; }

  .page-content { max-width: 780px; }

  .page-image {
    float: right;
    margin: 0 0 1.5rem 2rem;
    max-width: min(400px, 45%);
    border: 1px solid var(--color-purple);
    border-radius: var(--radius);
  }

  .page-content::after { content: ""; display: table; clear: both; }

  /* ── Board of Directors ───────────────────────────────────── */
  .board-photo {
    width: 120px;
    border-radius: var(--radius);
    border: 1px solid var(--color-purple);
  }

  .board-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    margin-block-start: 2rem;
  }

  .board-card {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    padding: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: #fafafa;
  }

  .board-card img {
    width: 90px;
    height: auto;
    border-radius: var(--radius);
    flex-shrink: 0;
  }

  .board-card h3 { font-size: var(--fs-base); margin-block-end: 0.25rem; }
  .board-card p  { font-size: var(--fs-sm); margin-block-end: 0.2rem; }
  .board-role    { color: #555; }

  /* ── News ─────────────────────────────────────────────────── */
  .news-list { display: flex; flex-direction: column; gap: 2.5rem; }

  .news-article { border-block-end: 1px solid var(--color-border); padding-block-end: 2rem; }
  .news-article:last-child { border-block-end: none; }

  .news-meta { font-size: var(--fs-sm); color: #666; margin-block-end: 0.5rem; }

  .news-article img {
    float: left;
    margin: 0 1.5rem 1rem 0;
    max-width: 340px;
    border-radius: var(--radius);
  }

  .news-article::after { content: ""; display: table; clear: both; }

  /* ── Section list ─────────────────────────────────────────── */
  .section-list { list-style: none; padding: 0; margin-block-start: 1.5rem; }
  .section-list li { border-block-end: 1px solid var(--color-border); }
  .section-list a {
    display: block;
    padding: 0.6rem 0;
    font-weight: 600;
    text-decoration: none;
  }
  .section-list a:hover { color: var(--color-purple); }

  /* ── Program skill levels ─────────────────────────────────── */
  .skill-levels { display: flex; flex-direction: column; gap: 1.5rem; margin-block-start: 1.5rem; }

  .skill-level {
    padding: 1rem 1.25rem;
    border-inline-start: 4px solid var(--color-purple);
    background: #f8f7ff;
    border-radius: 0 var(--radius) var(--radius) 0;
  }

  .skill-level h3 { color: var(--color-purple); margin-block-end: 0.25rem; }
  .skill-ages { font-weight: 400; font-size: var(--fs-sm); color: #555; }

  /* ── Attributes pill list ─────────────────────────────────── */
  .attributes-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    list-style: none;
    padding: 0;
    margin-block-start: 1rem;
  }

  .attributes-list li {
    background: var(--color-purple);
    color: #fff;
    padding: 0.3rem 0.75rem;
    border-radius: 999px;
    font-size: var(--fs-sm);
    font-weight: 600;
  }

  /* ── Contact ──────────────────────────────────────────────── */
  .contact-list { list-style: none; padding: 0; display: flex; flex-direction: column; gap: 1rem; }

  .contact-list li { display: flex; gap: 0.5rem; align-items: baseline; flex-wrap: wrap; }

  .contact-label { font-weight: 700; min-width: 140px; color: var(--color-blue-dark); }
}

/* ── Utilities ──────────────────────────────────────────────── */
@layer utilities {
  .visually-hidden {
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    height: 1px;
    overflow: hidden;
    position: absolute;
    white-space: nowrap;
    width: 1px;
  }
}

/* ── Reduced motion ─────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
  .swiper { --swiper-speed: 0 !important; }
}

/* ── Responsive — tablet ─────────────────────────────────────── */
@media (max-width: 860px) {
  .board-grid { grid-template-columns: 1fr; }
  .tagline    { font-size: var(--fs-base); }
}

/* ── Responsive — mobile ─────────────────────────────────────── */
@media (max-width: 680px) {
  .header-inner  { flex-direction: column; align-items: flex-start; gap: 0.75rem; }
  .logo img      { height: 70px; }
  .tagline       { text-align: left; }

  /* Hamburger nav */
  .nav-toggle    { display: flex; }

  .nav-list {
    flex-direction: column;
    display: none;
    width: 100%;
    padding-block-end: 0.5rem;
  }

  .nav-list.is-open { display: flex; }

  .nav-item > a  { padding: 0.65rem 1rem; }

  .dropdown {
    position: static;
    display: block;
    box-shadow: none;
    border-top: none;
    padding-inline-start: 1.25rem;
    background: var(--color-purple-dark);
  }

  .page-image { float: none; margin: 0 0 1rem 0; max-width: 100%; }
  .news-article img { float: none; margin: 0 0 1rem 0; max-width: 100%; }
  .footer-inner  { flex-direction: column; gap: 0.25rem; }
  .swiper        { aspect-ratio: auto; height: 220px; }
  .slide-caption { font-size: var(--fs-base); max-width: 100%; }
}