/*
 * Gradient Fund — Reference Stylesheet
 * =====================================
 * This file is the complete intended stylesheet for the site.
 * Copy it to src/css/styles.css and adjust as needed.
 *
 * Design system: "Clean Ivory" (Fulcrum Project)
 * Feel: Academic, warm, polished, professional but approachable.
 *
 * Structure:
 *   1. Reset & base
 *   2. Design tokens (CSS custom properties)
 *   3. Typography
 *   4. Layout — page shell, header, footer
 *   5. Home page — hero, approach cards, CTA
 *   6. Questions page — search, accordion, link tiles
 *   7. Utilities
 *   8. Responsive overrides (mobile-first, breakpoints at 640px / 768px / 1024px)
 */


/* ─────────────────────────────────────────────────────────────────────────────
   1. Reset & Base
   ───────────────────────────────────────────────────────────────────────────── */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%; /* 16px base */
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg-page);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--text-body-size);
  line-height: 1.625;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}

input,
textarea,
select {
  font: inherit;
}


/* ─────────────────────────────────────────────────────────────────────────────
   2. Design Tokens
   ───────────────────────────────────────────────────────────────────────────── */

:root {
  /* ── Backgrounds ── */
  --color-bg-page:       #FAF9F6; /* warm ivory — primary page background */
  --color-bg-card:       #FFFFFF; /* white — cards, accordion bodies      */

  /* ── Primary accent — Navy ── */
  --color-navy:          #1B3A5C; /* headings, active states, links        */
  --color-navy-dark:     #0F2440; /* hover state for navy elements         */
  --color-navy-light-bg: #E8EDF2; /* light tint — badge/tile hover bg      */

  /* ── Secondary accent — Green ── */
  --color-green:         #4A7C59;
  --color-green-light-bg:#E8F0EA;

  /* ── Text ── */
  --color-text-primary:  #1A1A1A;
  --color-text-secondary:#6B7280;
  --color-text-tertiary: #9CA3AF;

  /* ── Borders ── */
  --color-border-light:  #E5E7EB;
  --color-border-subtle: #F3F4F6;

  /* ── Shadows ── */
  --shadow-card:       0 1px 3px rgba(27, 58, 92, 0.08),
                       0 1px 2px rgba(27, 58, 92, 0.06);
  --shadow-card-hover: 0 4px 6px rgba(27, 58, 92, 0.10),
                       0 2px 4px rgba(27, 58, 92, 0.06);

  /* ── Typography ── */
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body:    'Inter', system-ui, -apple-system, sans-serif;

  --text-h1-size:   2rem;
  --text-h2-size:   1.5rem;
  --text-h3-size:   1.25rem;
  --text-body-size: 0.9375rem; /* 15px */
  --text-small-size:0.75rem;   /* 12px */

  /* ── Spacing (base-8 scale) ── */
  --space-1:  0.25rem;   /*  4px */
  --space-2:  0.5rem;    /*  8px */
  --space-3:  0.75rem;   /* 12px */
  --space-4:  1rem;      /* 16px */
  --space-5:  1.25rem;   /* 20px */
  --space-6:  1.5rem;    /* 24px */
  --space-8:  2rem;      /* 32px */
  --space-10: 2.5rem;    /* 40px */
  --space-12: 3rem;      /* 48px */
  --space-16: 4rem;      /* 64px */

  /* ── Layout ── */
  --max-width-page:    80rem;   /* 1280px */
  --max-width-content: 56rem;   /* 896px  */
  --page-padding-x:    var(--space-4);  /* 16px mobile */

  /* ── Border radii ── */
  --radius-card:  0.5rem;
  --radius-input: 0.375rem;
  --radius-tile:  0.375rem;
  --radius-pill:  9999px;

  /* ── Transitions ── */
  --transition-fast:   150ms ease;
  --transition-normal: 200ms ease;
}


/* ─────────────────────────────────────────────────────────────────────────────
   3. Typography
   ───────────────────────────────────────────────────────────────────────────── */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--color-text-primary);
  line-height: 1.3;
}

h1 { font-size: var(--text-h1-size); font-weight: 700; line-height: 1.2; }
h2 { font-size: var(--text-h2-size); }
h3 { font-size: var(--text-h3-size); font-weight: 500; line-height: 1.4; }

p {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

a:focus-visible {
  outline: 2px solid var(--color-navy);
  outline-offset: 2px;
  border-radius: 2px;
}

strong {
  font-weight: 600;
  color: var(--color-text-primary);
}


/* ─────────────────────────────────────────────────────────────────────────────
   4. Layout — page shell, header, footer
   ───────────────────────────────────────────────────────────────────────────── */

/* ── Page wrapper ── */
.page-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.page-wrapper > main {
  flex: 1;
}

/* ── Constrained content container ── */
.container {
  width: 100%;
  max-width: var(--max-width-page);
  margin-inline: auto;
  padding-inline: var(--page-padding-x);
}

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

/* ── Site header ── */
.site-header {
  background-color: var(--color-bg-card);
  border-bottom: 1px solid var(--color-border-light);
  padding-block: var(--space-4);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.site-header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.site-header__logo-img {
  height: 2.75rem;
  width: auto;
  object-fit: contain;
}

/* ── Site nav ── */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.site-nav__link {
  font-family: var(--font-body);
  font-size: var(--text-small-size);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-pill);
  transition: color var(--transition-fast),
              background-color var(--transition-fast);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.site-nav__link:hover {
  color: var(--color-navy);
  background-color: var(--color-navy-light-bg);
}

.site-nav__link--active {
  color: var(--color-navy);
  background-color: var(--color-navy-light-bg);
}

/* ── Site footer ── */
.site-footer {
  border-top: 1px solid var(--color-border-light);
  padding-block: var(--space-8);
  margin-top: var(--space-16);
}

.site-footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.site-footer__text {
  font-size: var(--text-small-size);
  color: var(--color-text-tertiary);
}

.site-footer__link {
  font-size: var(--text-small-size);
  color: var(--color-navy);
  transition: color var(--transition-fast);
}

.site-footer__link:hover {
  color: var(--color-navy-dark);
  text-decoration: underline;
}


/* ─────────────────────────────────────────────────────────────────────────────
   5. Home Page
   ───────────────────────────────────────────────────────────────────────────── */

/* ── Page-level top padding ── */
.page-main {
  padding-block: var(--space-12) var(--space-16);
}

/* ── Home hero: two-column logo + intro ── */
.home-hero {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

.home-hero__logo-col {
  flex-shrink: 0;
}

.home-hero__logo {
  width: 7rem;   /* 112px */
  height: auto;
}

.home-hero__text-col {
  flex: 1;
}

.home-hero__tagline {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-8);
}

/* ── Approach cards ── */
.approach-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.approach-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-card);
  padding: var(--space-6);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
  transition: box-shadow var(--transition-normal),
              transform var(--transition-fast);
}

.approach-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-1px);
}

/* Large decorative background letter */
.approach-card__label {
  display: block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 5rem;
  line-height: 1;
  color: var(--color-navy);
  opacity: 0.10;
  position: absolute;
  bottom: var(--space-2);
  right: var(--space-4);
  user-select: none;
  pointer-events: none;
}

.approach-card__text {
  font-family: var(--font-body);
  font-size: var(--text-body-size);
  color: var(--color-text-secondary);
  line-height: 1.7;
  position: relative; /* sit above the decorative label */
}

/* ── Home CTA paragraph ── */
.home-cta {
  font-size: var(--text-body-size);
  color: var(--color-text-secondary);
  line-height: 1.75;
}

.home-cta a {
  color: var(--color-navy);
  font-weight: 500;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 2px;
  transition: text-decoration-color var(--transition-fast),
              color var(--transition-fast);
}

.home-cta a:hover {
  color: var(--color-navy-dark);
  text-decoration-color: currentColor;
}


/* ─────────────────────────────────────────────────────────────────────────────
   6. Questions Page
   ───────────────────────────────────────────────────────────────────────────── */

/* ── Page heading ── */
.questions-heading {
  font-family: var(--font-heading);
  font-size: var(--text-h1-size);
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: var(--space-8);
  letter-spacing: -0.02em;
}

/* ── Search bar ── */
.search {
  margin-bottom: var(--space-8);
}

.search__input {
  width: 100%;
  max-width: 28rem; /* 448px — feels focused, not stretched */
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-input);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-body-size);
  color: var(--color-text-primary);
  transition: border-color var(--transition-fast),
              box-shadow var(--transition-fast);
  /* Native search-cancel button styling */
  -webkit-appearance: none;
  appearance: none;
}

.search__input::placeholder {
  color: var(--color-text-tertiary);
}

.search__input:focus {
  outline: none;
  border-color: var(--color-navy);
  box-shadow: 0 0 0 3px rgba(27, 58, 92, 0.12);
}

/* Remove IE/Edge X button — we rely on the native one */
.search__input::-ms-clear { display: none; }

/* ── No-results message (shown by JS when filter matches nothing) ── */
.search__empty {
  display: none;
  font-size: var(--text-body-size);
  color: var(--color-text-tertiary);
  padding: var(--space-6) 0;
}

.search__empty--visible {
  display: block;
}

/* ── Accordion shell ── */
.accordion {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

/* ── Accordion item (one per organisation) ── */
.accordion__item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: box-shadow var(--transition-normal);
}

.accordion__item--open {
  box-shadow: var(--shadow-card-hover);
}

/* ── Accordion header (the clickable button row) ── */
.accordion__header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-6);
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: var(--text-h3-size);
  color: var(--color-text-primary);
  background: var(--color-bg-card);
  text-align: left;
  transition: background-color var(--transition-fast),
              color var(--transition-fast);
  /* Reset button styles */
  border: none;
  cursor: pointer;
}

.accordion__header:hover {
  background-color: var(--color-navy-light-bg);
  color: var(--color-navy);
}

.accordion__item--open > .accordion__header {
  background-color: var(--color-navy-light-bg);
  color: var(--color-navy);
  border-bottom: 1px solid var(--color-border-light);
}

.accordion__header:focus-visible {
  outline: 2px solid var(--color-navy);
  outline-offset: -2px;
}

/* ── Chevron icon ── */
.accordion__chevron {
  flex-shrink: 0;
  width: 1rem;
  height: 1rem;
  color: var(--color-text-tertiary);
  transition: transform var(--transition-normal),
              color var(--transition-fast);
}

.accordion__header:hover .accordion__chevron,
.accordion__item--open > .accordion__header .accordion__chevron {
  color: var(--color-navy);
}

.accordion__item--open > .accordion__header .accordion__chevron {
  transform: rotate(180deg);
}

/* ── Accordion body (the collapsible panel) ── */
.accordion__body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 280ms cubic-bezier(0.4, 0, 0.2, 1);
  background: var(--color-bg-page);
}

.accordion__item--open > .accordion__body {
  max-height: 9999px; /* large enough for any content */
}

/* Optional note inside accordion body (used for OEPA open-call text) */
.accordion__note {
  padding: var(--space-5) var(--space-6);
  font-size: var(--text-body-size);
  color: var(--color-text-secondary);
  line-height: 1.7;
  border-bottom: 1px solid var(--color-border-subtle);
}

.accordion__note a {
  color: var(--color-navy);
  font-weight: 500;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 2px;
  transition: text-decoration-color var(--transition-fast);
}

.accordion__note a:hover {
  text-decoration-color: currentColor;
}

/* ── Link tile (one per question) ── */
.link-tile {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-6);
  background: var(--color-bg-card);
  border-left: 3px solid transparent;
  text-decoration: none;
  transition: background-color var(--transition-fast),
              border-left-color var(--transition-fast);
}

/* Divider between consecutive tiles */
.link-tile + .link-tile {
  border-top: 1px solid var(--color-border-subtle);
}

.link-tile:hover {
  background-color: var(--color-navy-light-bg);
  border-left-color: var(--color-navy);
}

.link-tile:focus-visible {
  outline: 2px solid var(--color-navy);
  outline-offset: -2px;
}

.link-tile__title {
  font-family: var(--font-body);
  font-size: var(--text-body-size);
  font-weight: 400;
  color: var(--color-navy);
  line-height: 1.5;
  flex: 1;
  /* Prevent very long titles from breaking layout */
  min-width: 0;
}

.link-tile__arrow {
  flex-shrink: 0;
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast),
              transform var(--transition-fast);
}

.link-tile:hover .link-tile__arrow {
  color: var(--color-navy);
  transform: translateX(2px);
}


/* ─────────────────────────────────────────────────────────────────────────────
   7. Utilities
   ───────────────────────────────────────────────────────────────────────────── */

/* Visually hidden but accessible to screen readers */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Used by JS to hide elements */
[hidden] {
  display: none !important;
}


/* ─────────────────────────────────────────────────────────────────────────────
   8. Responsive overrides  (mobile-first)
   ───────────────────────────────────────────────────────────────────────────── */

/* ── sm: 640px ── */
@media (min-width: 640px) {
  :root {
    --page-padding-x: var(--space-6); /* 24px */
  }

  .home-hero__logo {
    width: 8rem;
  }
}

/* ── md: 768px ── */
@media (min-width: 768px) {
  :root {
    --page-padding-x: var(--space-8); /* 32px */
    --text-h1-size: 2.5rem;
  }

  /* Home hero switches to side-by-side */
  .home-hero {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--space-10);
  }

  .home-hero__logo-col {
    width: 20%;
    min-width: 7rem;
  }

  .home-hero__logo {
    width: 100%;
    max-width: 9rem;
  }

  .home-hero__text-col {
    flex: 1;
  }

  /* Approach cards: 3 columns */
  .approach-cards {
    grid-template-columns: repeat(3, 1fr);
  }

  /* Search input: natural width on larger screens */
  .search__input {
    width: auto;
  }
}

/* ── lg: 1024px ── */
@media (min-width: 1024px) {
  :root {
    --page-padding-x: var(--space-10); /* 40px */
  }

  .home-hero__logo {
    max-width: 10rem;
  }
}