:root{
  /* Typography (Vietnamese-friendly) */
  --apk-font: "Be Vietnam Pro", "BeVietnamPro", "Inter", "Segoe UI", Roboto,
              "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans",
              "Tahoma", "Verdana", system-ui, -apple-system, sans-serif;

  /* Light theme base */
  --apk-page: #ffffff;
  --apk-surface: #ffffff;
  --apk-surface-2: #f6f7f9;
  --apk-text: #0f172a;
  --apk-muted: #64748b;
  --apk-border: rgba(15, 23, 42, 0.12);
  --apk-shadow: 0 10px 24px rgba(15,23,42,0.10);

  /* Gradients */
  --apk-grad-1: linear-gradient(135deg, #2563eb 0%, #7c3aed 55%, #db2777 100%);
  --apk-grad-2: linear-gradient(135deg, #16a34a 0%, #22c55e 40%, #2563eb 100%);
  --apk-grad-soft: linear-gradient(135deg, rgba(37,99,235,0.10), rgba(124,58,237,0.10), rgba(219,39,119,0.08));

  --apk-accent: #16a34a;
  --apk-accent2: #2563eb;

  /* NEW: Badge high-contrast colors */
  --apk-badge-undone: linear-gradient(135deg, #0ea5e9 0%, #2563eb 55%, #7c3aed 100%);
  --apk-badge-done: linear-gradient(135deg, #16a34a 0%, #22c55e 55%, #10b981 100%);
}

.apk-app{
  max-width: 1060px;
  margin: 0 auto;
  padding: 14px;
  color: var(--apk-text);
  background: transparent;
  font-family: var(--apk-font);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* =========================
   Header / Progress (Gradient)
========================= */
.apk-header{
  position: sticky;
  top: 0;
  z-index: 20;
  border-radius: 16px;
  margin-bottom: 14px;
  overflow: hidden;
  box-shadow: 0 10px 26px rgba(15,23,42,0.12);
  border: 1px solid rgba(255,255,255,0.55);
  background: var(--apk-grad-soft);
  backdrop-filter: blur(10px);
}
.apk-header::before{
  content:"";
  position:absolute;
  inset:0;
  background: rgba(255,255,255,0.82);
}
.apk-header > *{ position: relative; }

.apk-header__title{
  font-weight: 950;
  font-size: 16px;
  padding: 12px 12px 8px;
  letter-spacing: 0.2px;
}

.apk-progress{ padding: 0 12px 12px; }

.apk-progress__row{
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.apk-progress__text{
  font-size: 13px;
  color: var(--apk-muted);
  font-weight: 650;
}

.apk-progress__bar{
  height: 11px;
  width: 100%;
  margin-top: 10px;
  background: rgba(15,23,42,0.06);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid rgba(15,23,42,0.08);
}
.apk-progress__fill{
  display:block;
  height: 100%;
  width: 0%;
  background: var(--apk-grad-2);
  border-radius: 999px;
  transition: width .25s ease;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.22);
}

.apk-toggle-done{
  border: 0;
  background: var(--apk-grad-1);
  color: #fff;
  padding: 9px 12px;
  border-radius: 12px;
  font-weight: 900;
  cursor: pointer;
  font-size: 13px;
  box-shadow: 0 10px 18px rgba(37,99,235,0.18);
}
.apk-toggle-done:hover{ filter: brightness(1.03); }
.apk-toggle-done:active{ transform: translateY(1px); }

/* =========================
   Grid
========================= */
.apk-grid{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
@media (min-width: 640px){
  .apk-grid{ grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (min-width: 960px){
  .apk-grid{ grid-template-columns: repeat(5, minmax(0, 1fr)); }
}

.apk-card{
  display: block;
  text-decoration: none !important;
  color: inherit;
  border-radius: 16px;
  overflow: hidden;
  background: var(--apk-surface);
  border: 1px solid var(--apk-border);
  box-shadow: 0 6px 16px rgba(15,23,42,0.06);
  transition: transform .12s ease, box-shadow .12s ease, border-color .12s ease;
}
.apk-card:hover{
  transform: translateY(-2px);
  box-shadow: var(--apk-shadow);
  border-color: rgba(15,23,42,0.18);
}

/* no crop */
.apk-card__media{
  position: relative;
  width: 100%;
  aspect-ratio: 9 / 16;
  background: linear-gradient(180deg, #fafafa, #f3f4f6);
  display: flex;
  align-items: center;
  justify-content: center;
}
.apk-card__media img{
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

/* ✅ FIX: Badge trạng thái tương phản cao, đọc rõ trên mọi ảnh */
.apk-card__badge{
  position: absolute;
  top: 10px;
  left: 10px;

  font-size: 12px;
  padding: 7px 10px;
  border-radius: 999px;

  color: #ffffff;
  font-weight: 950;
  letter-spacing: 0.2px;

  background: var(--apk-badge-undone);
  border: 1px solid rgba(255,255,255,0.55);
  box-shadow:
    0 12px 20px rgba(15,23,42,0.18),
    inset 0 0 0 1px rgba(255,255,255,0.18);

  text-shadow: 0 1px 2px rgba(0,0,0,0.35);
}

/* Badge "Đã xong" nổi bật hơn nữa */
.apk-card.is-done .apk-card__badge{
  background: var(--apk-badge-done);
  border-color: rgba(255,255,255,0.60);
  box-shadow:
    0 12px 20px rgba(22,163,74,0.18),
    inset 0 0 0 1px rgba(255,255,255,0.18);
}

.apk-card__title{
  padding: 10px 10px 11px;
  font-size: 12px;
  color: #0f172a;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 700;
}

/* hide done by default */
.apk-grid[data-show-done="0"] .apk-card.is-done{ display: none; }

/* =========================
   Viewer
========================= */
.apk-viewer{
  border: 1px solid var(--apk-border);
  border-radius: 18px;
  overflow: hidden;
  background: var(--apk-surface);
  box-shadow: var(--apk-shadow);
}

/* Gradient back bar */
.apk-back{
  display: inline-block;
  padding: 12px 14px;
  color: #ffffff;
  text-decoration: none;
  font-weight: 950;
  width: 100%;
  background: var(--apk-grad-1);
}
.apk-back:hover{ filter: brightness(1.03); }
.apk-back:active{ transform: translateY(1px); }

.apk-viewer__media{
  background: radial-gradient(1200px 500px at 50% 10%, rgba(37,99,235,0.25), rgba(0,0,0,0.95));
}
.apk-viewer__img{
  width: 100%;
  height: auto;
  display: block;
  max-height: 78vh;
  object-fit: contain;
}

.apk-viewer__meta{
  padding: 12px 14px 14px;
  background: var(--apk-surface);
}

.apk-viewer__title{
  font-weight: 950;
  font-size: 14px;
  margin-bottom: 10px;
  color: #0f172a;
}

.apk-viewer__actions{
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.apk-btn{
  border-radius: 12px;
  padding: 10px 12px;
  font-weight: 950;
  border: 1px solid var(--apk-border);
  cursor: pointer;
  font-size: 13px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--apk-surface);
  color: #0f172a;
  box-shadow: 0 6px 16px rgba(15,23,42,0.06);
}
.apk-btn:hover{ background: var(--apk-surface-2); }
.apk-btn:active{ transform: translateY(1px); }

.apk-btn--primary{
  border: 0;
  background: var(--apk-grad-2);
  color: #ffffff;
  box-shadow: 0 12px 20px rgba(22,163,74,0.18);
}
.apk-btn--primary:hover{ filter: brightness(1.02); }
.apk-btn--primary:disabled{ opacity: .7; cursor: not-allowed; }

.apk-viewer__hint{
  margin-top: 10px;
  color: var(--apk-muted);
  font-size: 13px;
  line-height: 1.45;
  background: rgba(37,99,235,0.06);
  border: 1px solid rgba(37,99,235,0.10);
  border-radius: 14px;
  padding: 10px 12px;
}

/* =========================
   Modal Fullscreen
========================= */
.apk-modal{
  position: fixed;
  inset: 0;
  z-index: 999999;
  display: none;
  font-family: var(--apk-font);
}
.apk-modal.is-open{ display:block; }

.apk-modal__backdrop{
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.78);
}

.apk-modal__panel{
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
}

.apk-modal__topbar{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  color: rgba(255,255,255,0.95);
  background: linear-gradient(90deg, rgba(37,99,235,0.40), rgba(124,58,237,0.38), rgba(219,39,119,0.34));
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.10);
}

.apk-modal__title{
  font-weight: 950;
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.apk-modal__close{
  border: 1px solid rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.10);
  color: rgba(255,255,255,0.98);
  border-radius: 12px;
  padding: 8px 10px;
  font-weight: 950;
  cursor: pointer;
}
.apk-modal__close:hover{ background: rgba(255,255,255,0.14); }

.apk-modal__stage{
  position: relative;
  flex: 1;
  overflow: hidden;
  touch-action: none;
}

.apk-zoom-wrap{
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: translate3d(0,0,0) scale(1);
  transform-origin: center center;
  will-change: transform;
}

.apk-modal__img{
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  user-select: none;
  -webkit-user-drag: none;
  pointer-events: none;
}