/* ==========================================================================
   Event Registration Web App — single stylesheet
   --------------------------------------------------------------------------
   Contents
     1. Design tokens (colours, spacing, radii as CSS custom properties)
     2. Reset and base typography
     3. Page frame: header, main column, footer
     4. Shared components: buttons, badges, cards, forms, tables,
        flash messages, detail lists, dialog
     5. Page-specific sections: home, event detail, confirmation,
        organiser list/detail, error page
     6. Small-screen adjustments
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design tokens
   -------------------------------------------------------------------------- */
:root {
  /* Brand palette: deep teal with a warm amber accent */
  --colour-brand: #0e6e6e;
  --colour-brand-dark: #0a5252;
  --colour-accent: #e8a13d;
  --colour-ink: #1d2d35;          /* main text */
  --colour-ink-soft: #5a6b74;     /* secondary text */
  --colour-line: #d9e2e4;         /* borders and dividers */
  --colour-paper: #ffffff;        /* card surfaces */
  --colour-wash: #f4f7f7;         /* page background */
  --colour-danger: #b3372f;
  --colour-danger-dark: #942d26;
  --colour-success-bg: #e7f4ec;
  --colour-success-ink: #205b38;
  --colour-error-bg: #fbeae8;
  --colour-error-ink: #8c2b24;

  --radius: 10px;
  --shadow: 0 1px 3px rgba(29, 45, 53, 0.10), 0 4px 14px rgba(29, 45, 53, 0.06);
  --page-width: 62rem;
}

/* --------------------------------------------------------------------------
   2. Reset and base typography
   -------------------------------------------------------------------------- */
* {
  box-sizing: border-box;
  margin: 0;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--colour-ink);
  background-color: var(--colour-wash);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3 {
  line-height: 1.25;
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.2rem; }

a {
  color: var(--colour-brand);
}

/* Hides text visually but keeps it for screen readers. */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   3. Page frame
   -------------------------------------------------------------------------- */
.site-header {
  background-color: var(--colour-brand);
  color: #ffffff;
}

.site-header-inner {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: #ffffff;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.05rem;
}

.site-nav {
  display: flex;
  gap: 0.25rem;
}

.site-nav a {
  color: #ffffff;
  text-decoration: none;
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
}

.site-nav a:hover {
  background-color: var(--colour-brand-dark);
}

.page {
  flex: 1;                          /* pushes the footer to the bottom */
  width: 100%;
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 1.75rem 1.25rem 3rem;
}

.site-footer {
  border-top: 1px solid var(--colour-line);
  background-color: var(--colour-paper);
  text-align: center;
  padding: 1.1rem 1.25rem;
  font-size: 0.85rem;
  color: var(--colour-ink-soft);
}

.site-footer-note {
  font-size: 0.75rem;
}

.breadcrumb {
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

/* --------------------------------------------------------------------------
   4. Shared components
   -------------------------------------------------------------------------- */

/* Buttons — <a> and <button> share the same classes, so both need the
   same box model and font. */
.button {
  display: inline-block;
  padding: 0.5rem 1.05rem;
  border: 1px solid transparent;
  border-radius: 7px;
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
}

.button-primary {
  background-color: var(--colour-brand);
  color: #ffffff;
}

.button-primary:hover {
  background-color: var(--colour-brand-dark);
}

.button-secondary {
  background-color: var(--colour-paper);
  color: var(--colour-brand);
  border-color: var(--colour-line);
}

.button-secondary:hover {
  border-color: var(--colour-brand);
}

.button-danger {
  background-color: var(--colour-danger);
  color: #ffffff;
}

.button-danger:hover {
  background-color: var(--colour-danger-dark);
}

.button-small {
  padding: 0.2rem 0.7rem;
  font-size: 0.85rem;
  background-color: var(--colour-paper);
  color: var(--colour-brand);
  border-color: var(--colour-line);
}

.button-block {
  display: block;
  text-align: center;
}

/* Badges — small status/price pills used on cards and in the table. */
.badge {
  display: inline-block;
  padding: 0.1rem 0.6rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
}

.badge-price {
  background-color: var(--colour-accent);
  color: #3d2a08;
}

.badge-places {
  background-color: var(--colour-success-bg);
  color: var(--colour-success-ink);
}

.badge-full {
  background-color: var(--colour-error-bg);
  color: var(--colour-error-ink);
}

.badge-confirmed {
  background-color: var(--colour-success-bg);
  color: var(--colour-success-ink);
}

.badge-cancelled {
  background-color: #ececec;
  color: #5f5f5f;
}

/* Flash messages (one-off notices after an action) */
.flash-stack {
  margin-bottom: 1.25rem;
}

.flash {
  padding: 0.7rem 1rem;
  border-radius: var(--radius);
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.flash-success {
  background-color: var(--colour-success-bg);
  color: var(--colour-success-ink);
}

.flash-error {
  background-color: var(--colour-error-bg);
  color: var(--colour-error-ink);
}

/* Definition lists used on detail/confirmation pages */
.detail-list {
  display: grid;
  grid-template-columns: max-content 1fr;
  column-gap: 1.25rem;
  row-gap: 0.35rem;
}

.detail-list dt {
  font-weight: 600;
  color: var(--colour-ink-soft);
}

/* Forms */
.form-card {
  background-color: var(--colour-paper);
  border: 1px solid var(--colour-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  max-width: 40rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 1rem;
}

.form-field {
  margin-bottom: 1rem;
}

.form-field label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--colour-line);
  border-radius: 7px;
  font: inherit;
  background-color: #ffffff;
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: 2px solid var(--colour-brand);
  outline-offset: 1px;
}

/* Set by registration-form.js when a field fails a client-side check. */
.form-field input.input-invalid,
.form-field textarea.input-invalid {
  border-color: var(--colour-danger);
}

.required {
  color: var(--colour-danger);
}

.optional {
  font-weight: 400;
  color: var(--colour-ink-soft);
  font-size: 0.85rem;
}

.field-error {
  color: var(--colour-danger);
  font-size: 0.85rem;
  margin-top: 0.25rem;
}

.form-required-note {
  color: var(--colour-ink-soft);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.form-page h1 {
  margin-bottom: 0.25rem;
}

.form-page-intro {
  color: var(--colour-ink-soft);
  margin-bottom: 1rem;
}

/* Tables */
.table-wrap {
  overflow-x: auto;                /* the table scrolls, not the page */
  background-color: var(--colour-paper);
  border: 1px solid var(--colour-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.data-table th,
.data-table td {
  text-align: left;
  padding: 0.6rem 0.85rem;
  border-bottom: 1px solid var(--colour-line);
  white-space: nowrap;
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.data-table thead th {
  background-color: var(--colour-wash);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--colour-ink-soft);
}

.row-cancelled td {
  color: var(--colour-ink-soft);
}

/* Native <dialog> confirmation box.
   margin: auto re-centres the modal: the global "* { margin: 0 }" reset
   above removes the browser's default centring margin, so we restore it. */
dialog {
  margin: auto;
  border: none;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  max-width: 24rem;
}

dialog::backdrop {
  background-color: rgba(29, 45, 53, 0.5);
}

.dialog-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.25rem;
  justify-content: flex-end;
}

/* --------------------------------------------------------------------------
   5. Page-specific sections
   -------------------------------------------------------------------------- */

/* Home page */
.hero {
  margin-bottom: 1.75rem;
}

.hero-intro {
  max-width: 46rem;
  color: var(--colour-ink-soft);
  margin-top: 0.5rem;
}

.event-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr));
  gap: 1.25rem;
}

.event-card {
  background-color: var(--colour-paper);
  border: 1px solid var(--colour-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}

.event-card-body {
  padding: 1.15rem 1.15rem 0.5rem;
  flex: 1;
}

.event-card-title a {
  color: var(--colour-ink);
  text-decoration: none;
}

.event-card-title a:hover {
  color: var(--colour-brand);
}

.event-card-tagline {
  color: var(--colour-ink-soft);
  font-size: 0.92rem;
  margin: 0.35rem 0 0.75rem;
}

.event-meta {
  list-style: none;
  padding: 0;
  font-size: 0.88rem;
  color: var(--colour-ink-soft);
}

.event-meta li {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.3rem;
}

/* The inline SVG meta icons: drawn as thin outlines in the brand colour,
   sized to sit neatly beside the text. */
.event-meta-icon {
  flex-shrink: 0;
  width: 15px;
  height: 15px;
  fill: none;
  stroke: var(--colour-brand);
  stroke-width: 1.3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.event-card-footer {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding: 0.85rem 1.15rem;
  border-top: 1px solid var(--colour-line);
}

.event-card-footer .button {
  margin-left: auto;
}

/* Event detail page */
.event-detail-tagline {
  color: var(--colour-ink-soft);
  margin: 0.35rem 0 1.25rem;
  font-size: 1.05rem;
}

.event-detail-layout {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 1.5rem;
  align-items: start;
}

.event-detail-main h2 {
  margin-bottom: 0.5rem;
}

.event-detail-aside {
  background-color: var(--colour-paper);
  border: 1px solid var(--colour-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  display: grid;
  gap: 1.1rem;
}

/* Availability widget (bar is animated by event-availability.js) */
.availability-heading {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--colour-ink-soft);
  margin-bottom: 0.4rem;
}

.availability-bar {
  height: 0.7rem;
  border-radius: 999px;
  background-color: var(--colour-wash);
  border: 1px solid var(--colour-line);
  overflow: hidden;
}

.availability-bar-fill {
  height: 100%;
  background-color: var(--colour-accent);
  border-radius: inherit;
  transition: width 0.6s ease;     /* makes the JS update glide */
}

.availability-text {
  font-size: 0.9rem;
  color: var(--colour-ink-soft);
  margin-top: 0.35rem;
}

.fully-booked-note {
  background-color: var(--colour-error-bg);
  color: var(--colour-error-ink);
  padding: 0.7rem 1rem;
  border-radius: var(--radius);
  font-weight: 500;
}

/* Confirmation page */
.confirmation {
  display: flex;
  justify-content: center;
}

.confirmation-card {
  background-color: var(--colour-paper);
  border: 1px solid var(--colour-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
  max-width: 34rem;
  text-align: center;
  display: grid;
  gap: 1rem;
  justify-items: center;
}

.confirmation-icon {
  width: 3.2rem;
  height: 3.2rem;
  border-radius: 50%;
  background-color: var(--colour-success-bg);
  color: var(--colour-success-ink);
  font-size: 1.8rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.confirmation-card .detail-list {
  text-align: left;
}

.confirmation-note {
  font-size: 0.9rem;
  color: var(--colour-ink-soft);
}

/* Organiser pages */
.admin-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.admin-summary {
  color: var(--colour-ink-soft);
  font-size: 0.92rem;
}

.admin-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.admin-filter,
.admin-search {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.admin-filter label,
.admin-search label {
  font-weight: 600;
  font-size: 0.9rem;
}

.admin-filter select,
.admin-search input {
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--colour-line);
  border-radius: 7px;
  font: inherit;
  background-color: #ffffff;
}

.admin-search input {
  min-width: 16rem;
}

.search-status {
  margin-top: 0.5rem;
  font-size: 0.88rem;
  color: var(--colour-ink-soft);
}

.detail-panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.detail-panel {
  background-color: var(--colour-paper);
  border: 1px solid var(--colour-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.detail-panel h2 {
  margin-bottom: 0.6rem;
}

.detail-panel h2 + .detail-list {
  margin-bottom: 1rem;
}

.detail-actions {
  display: flex;
  gap: 0.75rem;
}

/* Error page */
.error-page {
  text-align: center;
  padding: 3rem 0;
  display: grid;
  gap: 1rem;
  justify-items: center;
}

/* --------------------------------------------------------------------------
   6. Small-screen adjustments
   -------------------------------------------------------------------------- */
@media (max-width: 44rem) {
  .event-detail-layout,
  .detail-panels,
  .form-row {
    grid-template-columns: 1fr;    /* stack the two-column layouts */
  }

  .admin-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .admin-search input {
    min-width: 0;
    width: 100%;
  }
}