/*
 * Projects Manager — Frontend Stylesheet
 * Mobile-first, CSS Grid layout, smooth animations
 *
 * @package Projects_Manager
 * @version 1.0.0
 */

/* ==========================================================================
   1. CSS Custom Properties
   ========================================================================== */
:root {
  --pm-color-primary:    #1a56db;
  --pm-color-primary-h:  #1344b3;
  --pm-color-secondary:  #374151;
  --pm-color-text:       #111827;
  --pm-color-muted:      #6b7280;
  --pm-color-bg:         #ffffff;
  --pm-color-bg-alt:     #f9fafb;
  --pm-color-border:     #e5e7eb;
  --pm-color-shadow:     rgba(0,0,0,.08);
  --pm-color-shadow-h:   rgba(0,0,0,.16);

  --pm-radius-card:      12px;
  --pm-radius-btn:       6px;
  --pm-radius-badge:     20px;

  --pm-gap:              1.5rem;
  --pm-transition:       250ms cubic-bezier(.4,0,.2,1);
  --pm-font:             inherit;
}

/* ==========================================================================
   2. Wrapper & Grid
   ========================================================================== */
.pm-projects-wrap {
  width: 100%;
  font-family: var(--pm-font);
}

/* Grid — mobile-first: always 1 col */
.pm-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--pm-gap);
  width: 100%;
}

/* Tablet ≥ 600px: 2 columns (unless forced to 1) */
@media (min-width: 600px) {
  .pm-grid.pm-columns-2,
  .pm-grid.pm-columns-3,
  .pm-grid.pm-columns-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Desktop ≥ 960px: respect actual column setting */
@media (min-width: 960px) {
  .pm-grid.pm-columns-1 { grid-template-columns: 1fr; }
  .pm-grid.pm-columns-2 { grid-template-columns: repeat(2, 1fr); }
  .pm-grid.pm-columns-3 { grid-template-columns: repeat(3, 1fr); }
  .pm-grid.pm-columns-4 { grid-template-columns: repeat(4, 1fr); }
}

/* No-projects message */
.pm-no-projects {
  grid-column: 1 / -1;
  text-align: center;
  padding: 3rem 1rem;
  color: var(--pm-color-muted);
  font-size: 1rem;
}

/* ==========================================================================
   3. Filter Bar
   ========================================================================== */
.pm-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.75rem;
  align-items: center;
}

.pm-filter-btn {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .45rem 1.1rem;
  border: 1.5px solid var(--pm-color-border);
  border-radius: var(--pm-radius-badge);
  background: var(--pm-color-bg);
  color: var(--pm-color-secondary);
  font-size: .875rem;
  font-weight: 500;
  cursor: pointer;
  transition:
    background  var(--pm-transition),
    border-color var(--pm-transition),
    color        var(--pm-transition),
    box-shadow   var(--pm-transition);
  line-height: 1;
}

.pm-filter-btn:hover {
  border-color: var(--pm-color-primary);
  color: var(--pm-color-primary);
}

.pm-filter-btn.is-active {
  background:    var(--pm-color-primary);
  border-color:  var(--pm-color-primary);
  color:         #fff;
  box-shadow:    0 2px 8px rgba(26,86,219,.35);
}

/* ==========================================================================
   4. Project Card — Base
   ========================================================================== */
.pm-card {
  display: flex;
  flex-direction: column;
  background: var(--pm-color-bg);
  border-radius: var(--pm-radius-card);
  overflow: hidden;
  transition:
    transform   var(--pm-transition),
    box-shadow  var(--pm-transition);
  animation: pm-fade-in .35s ease both;
}

@keyframes pm-fade-in {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Entrance animation stagger for grid children */
.pm-card:nth-child(1)  { animation-delay: .04s; }
.pm-card:nth-child(2)  { animation-delay: .08s; }
.pm-card:nth-child(3)  { animation-delay: .12s; }
.pm-card:nth-child(4)  { animation-delay: .16s; }
.pm-card:nth-child(5)  { animation-delay: .20s; }
.pm-card:nth-child(6)  { animation-delay: .24s; }
.pm-card:nth-child(7)  { animation-delay: .28s; }
.pm-card:nth-child(8)  { animation-delay: .32s; }

/* ---- Style variants ---- */
.pm-card--shadow {
  box-shadow: 0 2px 12px var(--pm-color-shadow);
}

.pm-card--shadow:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 28px var(--pm-color-shadow-h);
}

.pm-card--border {
  border: 1.5px solid var(--pm-color-border);
}

.pm-card--border:hover {
  border-color: var(--pm-color-primary);
  transform: translateY(-3px);
}

.pm-card--minimal {
  background: transparent;
}

.pm-card--minimal:hover .pm-card__img {
  transform: scale(1.04);
}

/* ==========================================================================
   5. Card Media
   ========================================================================== */
.pm-card__media {
  position: relative;
  overflow: hidden;
  background: var(--pm-color-bg-alt);
  aspect-ratio: 16 / 9;
}

.pm-card__img-link {
  display: block;
  width: 100%;
  height: 100%;
}

.pm-card__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .4s ease;
}

.pm-card:hover .pm-card__img {
  transform: scale(1.04);
}

.pm-card__img-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #e5e7eb 0%, #f3f4f6 100%);
}

/* Video embed */
.pm-card__video-wrap {
  position: relative;
  width: 100%;
  height: 100%;
}

.pm-card__video-iframe,
.pm-card__video-native {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

/* ==========================================================================
   6. Card Body
   ========================================================================== */
.pm-card__body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 1.25rem 1.5rem 1.5rem;
  gap: .65rem;
}

.pm-card__title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--pm-color-text);
}

.pm-card__title a {
  color: inherit;
  text-decoration: none;
  transition: color var(--pm-transition);
}

.pm-card__title a:hover {
  color: var(--pm-color-primary);
}

.pm-card__excerpt {
  margin: 0;
  font-size: .875rem;
  line-height: 1.6;
  color: var(--pm-color-muted);
  flex: 1;
}

.pm-card__actions {
  display: flex;
  gap: .6rem;
  flex-wrap: wrap;
  margin-top: .25rem;
}

/* ==========================================================================
   7. Buttons
   ========================================================================== */
.pm-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  padding: .5rem 1.1rem;
  border: 1.5px solid transparent;
  border-radius: var(--pm-radius-btn);
  font-size: .875rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition:
    background    var(--pm-transition),
    border-color  var(--pm-transition),
    color         var(--pm-transition),
    box-shadow    var(--pm-transition);
  white-space: nowrap;
  line-height: 1;
}

.pm-btn--primary {
  background: var(--pm-color-primary);
  border-color: var(--pm-color-primary);
  color: #fff;
}

.pm-btn--primary:hover {
  background:   var(--pm-color-primary-h);
  border-color: var(--pm-color-primary-h);
  box-shadow:   0 3px 10px rgba(26,86,219,.4);
  color: #fff;
}

.pm-btn--secondary {
  background:   transparent;
  border-color: var(--pm-color-border);
  color:        var(--pm-color-secondary);
}

.pm-btn--secondary:hover {
  border-color: var(--pm-color-primary);
  color:        var(--pm-color-primary);
}

/* ==========================================================================
   8. Load More
   ========================================================================== */
.pm-load-more-wrap {
  display: flex;
  justify-content: center;
  margin-top: 2.5rem;
}

.pm-load-more-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  padding: .7rem 2rem;
  background: var(--pm-color-primary);
  color: #fff;
  border: none;
  border-radius: var(--pm-radius-btn);
  font-size: .9375rem;
  font-weight: 600;
  cursor: pointer;
  transition:
    background   var(--pm-transition),
    box-shadow   var(--pm-transition),
    opacity      var(--pm-transition);
}

.pm-load-more-btn:hover:not(:disabled) {
  background: var(--pm-color-primary-h);
  box-shadow: 0 4px 16px rgba(26,86,219,.4);
}

.pm-load-more-btn:disabled,
.pm-load-more-btn.is-done {
  background: var(--pm-color-border);
  color: var(--pm-color-muted);
  cursor: not-allowed;
  box-shadow: none;
}

/* Spinner */
.pm-btn-spinner {
  display: none;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: pm-spin .6s linear infinite;
}

.pm-load-more-btn.is-loading .pm-btn-spinner {
  display: block;
}

.pm-load-more-btn.is-loading .pm-btn-text {
  opacity: .6;
}

@keyframes pm-spin {
  to { transform: rotate(360deg); }
}

/* ==========================================================================
   9. Skeleton Loading
   ========================================================================== */
.pm-skeleton-card {
  border-radius: var(--pm-radius-card);
  overflow: hidden;
  background: var(--pm-color-bg);
  box-shadow: 0 2px 12px var(--pm-color-shadow);
}

.pm-skeleton-img {
  aspect-ratio: 16/9;
  background: linear-gradient(90deg, #e5e7eb 25%, #f3f4f6 50%, #e5e7eb 75%);
  background-size: 200% 100%;
  animation: pm-shimmer 1.4s infinite;
}

.pm-skeleton-body {
  padding: 1.25rem 1.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: .75rem;
}

.pm-skeleton-line {
  height: .85rem;
  border-radius: 4px;
  background: linear-gradient(90deg, #e5e7eb 25%, #f3f4f6 50%, #e5e7eb 75%);
  background-size: 200% 100%;
  animation: pm-shimmer 1.4s infinite;
}

.pm-skeleton-title { height: 1.1rem; width: 70%; }
.pm-skeleton-short { width: 45%; }

@keyframes pm-shimmer {
  to { background-position: -200% 0; }
}

/* ==========================================================================
   10. Grid transition when filtering
   ========================================================================== */
.pm-grid.is-filtering {
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease;
}

.pm-grid.is-visible {
  opacity: 1;
  transition: opacity .3s ease;
}

/* ==========================================================================
   11. Single Project Page
   ========================================================================== */
.pm-single-main {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

.pm-single-project {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* Media */
.pm-single__media {
  border-radius: var(--pm-radius-card);
  overflow: hidden;
  background: var(--pm-color-bg-alt);
}

.pm-single__thumbnail { line-height: 0; }

.pm-single__img {
  width: 100%;
  height: auto;
  display: block;
}

.pm-single__video-wrap {
  position: relative;
  padding-top: 56.25%;
}

.pm-single__video-iframe,
.pm-single__video-native {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* Header */
.pm-single__header {
  display: flex;
  flex-direction: column;
  gap: .75rem;
}

.pm-single__title {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 800;
  line-height: 1.25;
  color: var(--pm-color-text);
}

/* Category badges */
.pm-single__cats {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
}

.pm-single__cat-badge {
  display: inline-block;
  padding: .25rem .8rem;
  background: var(--pm-color-bg-alt);
  border: 1.5px solid var(--pm-color-border);
  border-radius: var(--pm-radius-badge);
  font-size: .8125rem;
  font-weight: 500;
  color: var(--pm-color-secondary);
  text-decoration: none;
  transition: border-color var(--pm-transition), color var(--pm-transition);
}

.pm-single__cat-badge:hover {
  border-color: var(--pm-color-primary);
  color: var(--pm-color-primary);
}

/* External link button */
.pm-single__ext-link {
  align-self: flex-start;
}

/* Body */
.pm-single__body {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--pm-color-text);
}

.pm-single__body p    { margin: 0 0 1.2em; }
.pm-single__body h2   { font-size: 1.4rem; margin: 1.5em 0 .5em; }
.pm-single__body h3   { font-size: 1.2rem; margin: 1.3em 0 .4em; }
.pm-single__body img  { max-width: 100%; border-radius: 8px; }
.pm-single__body a    { color: var(--pm-color-primary); }

/* ==========================================================================
   12. Project Navigation
   ========================================================================== */
.pm-project-nav {
  margin-top: 1rem;
  border-top: 1.5px solid var(--pm-color-border);
  padding-top: 1.75rem;
}

.pm-project-nav__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: center;
}

.pm-project-nav__link {
  display: flex;
  flex-direction: column;
  gap: .25rem;
  text-decoration: none;
  color: var(--pm-color-text);
  padding: .75rem;
  border-radius: 8px;
  transition: background var(--pm-transition);
}

.pm-project-nav__link:hover {
  background: var(--pm-color-bg-alt);
}

.pm-project-nav__link--next {
  text-align: right;
  align-items: flex-end;
}

.pm-project-nav__link--disabled {
  pointer-events: none;
  opacity: 0;
}

.pm-project-nav__label {
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--pm-color-muted);
}

.pm-project-nav__title {
  font-size: .9375rem;
  font-weight: 600;
  color: var(--pm-color-text);
}

.pm-project-nav__all {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1.5px solid var(--pm-color-border);
  border-radius: 50%;
  color: var(--pm-color-secondary);
  font-size: 1.1rem;
  text-decoration: none;
  transition:
    border-color var(--pm-transition),
    color        var(--pm-transition);
}

.pm-project-nav__all:hover {
  border-color: var(--pm-color-primary);
  color: var(--pm-color-primary);
}

/* ==========================================================================
   13. Utilities / Accessibility
   ========================================================================== */
.screen-reader-text {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

/* Focus visible ring */
.pm-filter-btn:focus-visible,
.pm-load-more-btn:focus-visible,
.pm-btn:focus-visible,
.pm-project-nav__link:focus-visible,
.pm-project-nav__all:focus-visible {
  outline: 3px solid var(--pm-color-primary);
  outline-offset: 2px;
}

/* ==========================================================================
   14. Dark-mode support (respects OS preference)
   ========================================================================== */
@media (prefers-color-scheme: dark) {
  :root {
    --pm-color-text:    #f9fafb;
    --pm-color-muted:   #9ca3af;
    --pm-color-bg:      #1f2937;
    --pm-color-bg-alt:  #111827;
    --pm-color-border:  #374151;
    --pm-color-shadow:  rgba(0,0,0,.4);
    --pm-color-shadow-h:rgba(0,0,0,.6);
    --pm-color-secondary: #d1d5db;
  }
}