/*
 * main.css for album.html
 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  /* clamp(MIN, VAL, MAX) */
  font-size: clamp(12px, 1rem + 0.5vw, 24px);
}

a {
  color: gray !important;
  text-decoration: none;
}
a:active {
  color: deepskyblue;
}
a:focus-visible {
  border-radius: 0.25em;
  /* lighter or semi-transparent border */
  outline: 0.125em solid rgba(0,255,255,0.375);
  outline-offset: 0.125em;
}
a:visited {
  color: darkseagreen;
}
a:hover {
  color: darkorange !important;
  border-bottom: dotted 0.125em dimgray;
  padding-bottom: 0.125em;
  text-decoration: none !important;
  font-weight: bold;
}

body {
  align-items: center;
  background-color: #121212;
  color: #e0e0e0;
  display: flex;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, "Microsoft YaHei", "STHeiti", "Heiti SC", "PingFang SC", "微软雅黑", "黑体", "华文细黑", "Hiragino Sans GB", "Helvetica Neue", "Sarasa Gothic", "Source Code Pro", Verdana, Arial, sans-serif;
  font-size: 16px;
  height: 100vh;
  justify-content: center;
  overflow: hidden;
}

/* Remove outline on mouse click, but keep it for keyboard */
button:focus:not(:focus-visible) {
  outline: none;
}

/* BEGIN cover */
@keyframes effectFadeOut {
  0% {
    /* Blocks background clicks while active */
    pointer-events: auto;
    visibility: visible;
    opacity: 1;
  }
  85% {
    pointer-events: auto;
    visibility: visible;
    opacity: 1;
  }
  100% {
    /* Allows clicking elements underneath */
    pointer-events: none;
    visibility: hidden; /* completely gone from the layout */
    opacity: 0;
  }
}
/* The animation class triggered by JavaScript */
.animate {
  animation: effectFadeOut var(--duration, 5s) ease-out forwards;
}
/* The full-screen overlay */
.cover-overlay {
  background-color: rgba(0,0,0,0.85); /* semi-transparent */
  height: 100vh; width: 100vw;
  left: 0; top: 10;
  position: fixed;
  z-index: 999; /* must be higher than all other elements */
  /* Centering the content inside */
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  /* Default state: hidden and non-interactive */
  pointer-events: none;
  visibility: hidden;
  opacity: 0;
}
.cover-overlay div:first-child {
  background-color: transparent;
  display: inline-block;
  position: relative;
}
.cover-overlay div:first-child div#bgcCover {
  background-color: rgba(0,0,80,0.5); /* navy */
  border-radius: 0.55rem;
  height: 100%; width: 100%;
  left: 0; top: 0;
  position: absolute;
  z-index: -1;
}
/* The content element centered inside the overlay */
.cover-content {
  z-index: 1;
  position: relative;
  color: lightgray;
  background-color: transparent;
  border: double 1rem gray;
  border-radius: 0.55rem;
  font-family: "Microsoft YaHei", "微软雅黑", "STHeiti", "Heiti SC", "黑体", "Hiragino Sans GB", "Segoe UI", Helvetica, "Helvetica Neue", "Sarasa Gothic", "Source Code Pro", Verdana, Arial, -apple-system, sans-serif;
  font-size: 3rem;
  font-weight: bold;
  padding: 1.5rem;
}
/* Default landscape or standard layout */
.cover-content,
.cover-overlay .cover-extra,
.cover-content::before {
  writing-mode: horizontal-tb;
}
.cover-overlay .cover-extra::after {
  /*
  color: transparent;
  /* ⏹ ⏸ ⏵ ⏯ */
  color: dimgray;
  content: '© Jason Zhu | Dockerian'; /* content: '■ ⏸ ▶ ⏯'; */
  display: inline-block;
  height: 3.5rem; /* adding extra gap */
  font-size: 0.75rem;
  text-align: center;
  padding: 0.5rem 0.125rem;
  vertical-align: middle;
}
.cover-content::before {
  content: "舟山诗词影集";
  background-image: url('images/album-title.png');
  background-position: center;
  background-repeat: no-repeat; /* prevents tiling */
  background-size: contain;; /* scales to fit */
  color: transparent;
}
/* Portrait layout media query */
@media (orientation: portrait) {
  .cover-content,
  .cover-content::before {
    text-orientation: mixed; /* or upright */
    writing-mode: vertical-rl;
  }
  .cover-overlap .cover-extra {
    height: 6.5rem; /* adding extra gap */
  }
  .cover-overlay .cover-extra::after {
    content: '© Jason Zhu'; /* content: '■ ⏸ ▶ ⏯'; */
  }
  .cover-content::before {
    content: "诗 词 影 集";
    background-image: url('images/album-poetry.png');
    color: transparent;
  }
}
/* END cover */

/* responsive container to portrait and landscape forms */
.box-album {
  align-items: center;
  background-color: #1a1a1a;
  border-radius: 0.5em;
  border: 0.125em solid #333;
  box-shadow: 0 0.625em 1.875em rgba(0,0,0,0.7);
  display: flex;
  height: 100vh;
  justify-content: center;
  max-height: 99vh;
  max-width: 100vw;
  overflow: hidden;
  position: relative;
  width: 100vw;
}
.box-album:hover .p-exif {
  transform: translateX(0);
}
/* box containing images, handling flexible boundaries */
.box-image {
  align-items: center;
  display: flex;
  height: 100%;
  justify-content: center;
  position: relative; /* Essential to anchor absolute positioning context */
  width: 100%;
}
.box-image img, .box-image #curImage {
  max-height: 100%;
  max-width: 100%;
  object-fit: contain;
  pointer-events: none; /* Prevents image tracking dragging from fighting touches */
  user-select: none;
}
.box-image #curImage.disabled {
  height: 35%;
  max-height: 35%;
  max-width: 35%;
  width: 35%;
}

/* standard interactive UI overlays */
.ui-overlay {
  pointer-events: none;
  position: absolute;
  z-index: 10;
}
.ui-overlay button,
.ui-overlay input {
  background: rgba(0,0,0,0.6);
  border-radius: 0.25em;
  border: 0.0625em solid rgba(255,255,255,0.2);
  color: #fff;
  cursor: pointer;
  font-size: 0.875em;
  opacity: 0;
  padding: 0.5em 0.75em;
  pointer-events: auto;
  transition: opacity 0.2s ease, background 0.2s ease, transform 0.1s ease;
}

.ui-overlay button:hover {
  background: rgba(255,255,255,0.25);
  border-color: #fff;
}
.ui-overlay button:active {
  transform: scale(0.95);
}

/* active visibility elements on container hover */
.box-album:hover .ui-overlay button,
.box-album:hover .ui-overlay input,
.box-album:hover .btn-nav {
  opacity: 1;
}
/* optional visual feedback hint when hovering over the exact center */
.box-album:hover .click-zone:hover {
  background: rgba(0,0,0,0.05);
  border-color: rgba(255,255,255,0.075);
  border-radius: 20em;
}

/* dead-center overlay hitbox */
.click-zone:active {
  /* mobile device tap */
  -webkit-tap-highlight-color: rgba(0,0,0,0.25);
  border-radius: 50% !important; /* circle */
  transition: background-color 0.1s ease;
}
.click-zone {
  -webkit-tap-highlight-color: transparent;
  background: rgba(255,255,255,0); /* Invisible but fully actionable */
  border: 0.0625em dashed rgba(255,255,255,0); /* Hidden boundary frame */
  border-radius: 7em;
  color: darkred;
  cursor: pointer;
  font-size: 1.5em;
  font-weight: bold;
  height: 11.5em; /* Custom centralized hitbox height */
  left: 50%;
  padding: 5em 1em 2em 1em;
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  transition: border-color 0.2s ease, background-color 0.2s ease;
  text-align: center;
  width: 12em;  /* Custom centralized hitbox width */
  z-index: 99;  /* Over the image info pane */
}
.click-zone#clikZone:focus-visible {
  outline-color: rgb(0,0,0,0.125);
  outline-style: doted;
  outline-width: 0.125em;
  outline-offset: 0.25em;
}

#btnOpenP.active, #clikZone.active {
  display: inline-block;
  opacity: 1;
}
#btnOpenP.disabled, #clikZone.disabled {
  display: inline-block;
  opacity: 0.35;
  outline: none;
  border: none;
}

.divAwait, #divAwait {
  display: flex;
  background-position: center;
  background-image: url(images/awaiting-dots.gif);
  background-repeat: no-repeat;
  background-size: 20%;
  align-items: center;
  justify-content: center;
  display: grid;
  place-items: center;
  height: 100vh; width: 100vw;
  display: block;
  text-align: center;
  vertical-align: middle;
  left: 0; top: 0;
  position: fixed;
  z-index: 9;
  opacity: 0;
}
.divAwait img {
  display: none; /* DOES NOT center as inline-block */
  border: dotted 1px red;
  object-fit: contain;
  max-height: 33%;
  max-width: 33%;
}

.divCount, .sequence {
  bottom: 0em;
  left: 0em; right: auto;
  margin: 2em 1em;
  position: fixed;
  opacity: 0.35;
  z-index: 99;
}
.divCount #digitNum {
  cursor: default;
  align-items: center;     /* Vertically centers content */
  display: inline-flex;
  justify-content: center; /* Horizontally centers content */
  font-size: 1.5em;
  border-radius: 0.25em;
  border: solid 1px gray;
  min-width: 2.75em;
  padding: 0.5em;
}
.divCount #gigitNum.done {
  border-color: lime;
  color: lawngreen;
}
.divCount #digitNum.fair {
  border-color: gold;
  color: darkorange;
}
.divCount #digitNum.good {
  border-color: darkseagreen;
  color: limegreen;
}
.divCount #digitNum.okay {
  border-color: deepskyblue;
  color: whitesmoke;
}
.divCount #digitNum.poor {
  border-color: darkred;
  color: crimson;
}
.divCount #digitNum.step {
  color: gray;
}
.divCount:hover, #digiNum:hover, .step:hover {
  color: white;
  opacity: 1;
}
.divCount#divCount.await {
  opacity: 0.05;
}
.divCount#divCount.ready {
  opacity: 0.75;
}

.divLinks {
  bottom: 3.75em;
  left: 0em; right: auto;
  margin: 2em 1.25em;
  position: fixed;
  opacity: 0.35;
  z-index: 99;
}
.divLinks img {
  height: 3.5em;
}
.divLinks:hover {
  opacity: 1;
}
.divLinks:hover a {
  border: none !important; /* disable border */
}

.div-Pane {
  background: transparent;
  height: 100vh;
  opacity: 0.15;
  pointer-events: auto;
  position: fixed;
  top: 0;
  width: 30vw; /* 30% of the viewport width */
  z-index: 1; /* Ensure it sits on top */
}
.div-Pane#divHZone {
  left: 25vw; width: 50vw;
  opacity: 1;
}
.div-Pane#divLSide {
  left: 0; right: auto;
}
.div-Pane#divLSide:hover ~ .p-actions {
  opacity: 1;
}
.div-Pane#divLSide:hover ~ .p-actions #btnSlide,
.p-actions#pActions #divSlide:hover #btnSlide {
  max-width: 10em;
  width: 10em;
}
.div-Pane#divRSide {
  left: auto; right: 0;
}

/* actions panel for configuration transformations */
.p-actions {
  align-items: flex-start;
  display: flex;
  flex-direction: column;
  gap: 0.25em;
  height: 25vh; width: 25vw;
  min-height: 25vh;
  min-width: 25vw;
  opacity: 0.5;
  pointer-events: none;
  position: fixed;
  left: 0.75em;
  top: 1em;
}
.p-actions, .p-exif h3 {
  /* Prevent from selecting text */
  -webkit-touch-callout: none; /* iOS Safari */
  -webkit-user-select: none;   /* Safari */
  -khtml-user-select: none;    /* Konqueror HTML */
  -moz-user-select: none;      /* Old versions of Firefox */
  -ms-user-select: none;       /* Internet Explorer/Edge */
  user-select: none;           /* Non-prefixed version */
}
.p-actions:hover,
.p-actions:hover .p-slideshow,
.p-actions:hover .btn-Label .btn-Style,
.p-actions:hover #btnSlide {
  opacity: 0.95;
}
.p-slideshow {
  cursor: default;
  align-items: center;
  background: rgba(0,0,0,0.6);
  border-radius: 0.25em;
  border: 0.075em solid rgba(255,255,255,0.2);
  display: flex;
  gap: 0.25em;
  padding-right: 0.75em;
  text-align: left;
  transition: opacity 0.2s ease;
  opacity: 0.75;
}
.p-slideshow:hover {
  opacity: 1;
}

/* show on hover */
.box-album:hover .btn-Label .btn-Style {
  opacity: 0.75;
}

.btn-Label {
  display: inline-block;
  pointer-events: auto;
  white-space: nowrap;
  text-align: left;
}
.btn-Label .btn-Style#btnFoldr,
.btn-Label .btn-Style#btnFiles,
.btn-Label .btn-Style#btnFresh,
.btn-Label .btn-Style#btnSlide {
  background: rgba(0,0,0,0.5);
  border-radius: 0.25em;
  border: 0.0625em solid rgba(255,255,255,0.2);
  color: #fff;
  cursor: pointer;
  font-size: 1em;
  display: inline-flex;
  justify-content: flex-start; /* horizontal */
  align-items: center; /* vertical */
  gap: 0em;
  margin: 0em 0em 0em 0em;
  padding: 0.35em 0.75em 0.5em 0.75em;
  pointer-events: auto;
  transition: opacity 0.2s ease, background 0.2s ease, border-color 0.2s ease, transform 0.1s ease;
  user-select: none;
}
.btn-Label .btn-Style b,
.btn-Label .btn-Style span {
  margin: 0em; padding: 0em;
  display: inline-block;
}

/* highlight on button hover */
.btn-Label .btn-Style:hover,
.btn-Label .btn-Style:focus-visible {
  background: rgba(0,0,0,0.5);
  border-color: #fff;
  color: cyan;
  white-space: nowrap;
  text-align: left;
  opacity: 1;
}
/* responsive spring scaling effect on click/press */
.btn-Label .btn-Style:active,
.btn-Label .btn-Style:is-pressed {
  transform: scale(0.95);
}

.btn-Label #btnFiles ~ input {
  display: none;
}

.btn-Style#btnFiles b,
.btn-Style#btnFoldr b,
.btn-Style#btnFresh b,
.btn-Style#btnSlide b {
  /* Comparing to visibility setting, in order to
     prevent from its behaviors being overwritten by
     pseudo b::before or its children, use
  display: none; /* remove from element tree */
  visibility: collapse;
}
.btn-Style#btnFoldr::before,
.btn-Style#btnFiles::before,
.btn-Style#btnFresh::before,
.btn-Style#btnSlide::before {
  content: "";
  background-image: url();
  background-position: center;
  background-repeat: no-repeat; /* prevents tiling */
  background-size: contain; /* scales to fit */
  box-sizing: border-box; /* ensures padding/borders don't break the 1em size */
  display: inline-block;
  flex: 0em 0em 1em; /* do not grow, do not shrink, fix width at 1em */
  margin: 0em 0.25em 0em 0em;
  padding: 0;
  height: 1em; width: 1em;
  max-height: 1em; max-width: 1em;
  min-height: 1em; min-width: 1em;
  text-align: left;
  vertical-align: middle;
  white-space: nowrap;
}

.btn-Style#btnFiles::before {
  background-image: url("images/btn-files.png");
  content: "\01F4C2"; /* set its color to transparent vs
  color: aliceblue;   /* no color bg-image is present */
  color: transparent;
}
.btn-Style#btnFoldr::before {
  background-image: url("images/btn-folder.png");
  content: "\0F5BC;"; /* set its color to transparent vs
  color: moccasin;    /* no color bg-image is present */
  color: transparent;
}
.btn-Style#btnFresh::before {
  background-image: url("images/btn-refresh.png");
  content: "\021BA;"; /* set its color to transparent vs
  color: violet;      /* no color bg-image is present */
  color: transparent;
}

.btn-Style#btnSlide {
  border: none;
  background: transparent;
  display: inline-block;
  font-size: 1em;
  text-align: left !important;
  overflow: hidden;
  width: 4.5em;
}
.btn-Style#btnFiles:hover,
.btn-Style#btnFoldr:hover,
.btn-Style#btnFresh:hover,
.btn-Style#btnSlide:hover {
  background: rgba(0,0,0,0.5);
  border: dotted 1px gray;
  border-radius: 0.25em;
  color: cyan;
  opacity: 1;
}
.btn-Style#btnSlide[aria-disabled="false"]::before {
  background-image: url("images/btn-start.png");
  content: "►";     /* set its color to transparent vs
  color: palegreen; /* no color bg-image is present */
  color: transparent;
}
.btn-Style#btnSlide[aria-disabled="true"]::before {
  background-image: url("images/btn-stop.png");
  content: "■";   /* set its color to transparent vs
  color: crimson; /* no color bg-image is present */
  color: transparent;
  pointer-events: none; /* prevents mouse clicks, but keyboard users can still focus */
  cursor: not-allowed;
}

#divSlide:has(#btnSlide[aria-disabled="true"]) {
  pointer-events: none;
  opacity: 0.5;
}

.p-slideshow input {
  margin: 0em 0.25em;
}
.p-slideshow input[type="number"] {
  background: rgba(255,255,255,0.1);
  border: none;
  opacity: 1;
  padding: 0.35em;
  text-align: center;
  width: 3em;
}
.p-slideshow::after {
  content: "sec";
  padding: 0em 0em 0.25em 0;
  display: inline-block;
}

/* base navigation arrow overlays configuration */
.btn-nav {
  background: rgba(0,0,0,0.5);
  border-radius: 50%;
  border: 0.04em solid rgba(255,255,255,0.3);
  color: white;
  cursor: pointer;
  font-size: 1.5em;
  height: 2.5em;
  opacity: 0;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  transition: opacity 0.2s ease, background 0.2s ease, transform 0.1s ease;
  width: 2.5em;
  z-index: 99; /* Elevated higher than the .p-exif panel */
}
/* solid 100% opacity on desktop mouse pointer hover */
.btn-nav:hover {
  background: rgba(0,0,0,0.9);
  opacity: 1 !important; /* Forces peak focus priority over container state checks */
}
/* state rule applied dynamically by JS during mobile touch operations */
.btn-nav.force-visible {
  opacity: 1 !important;
}
.btn-next { right: 0.5em; }
.btn-prev { left: 0.5em; }
/* active hover visibility logic for parent desktop container tracking */
.box-album:hover .btn-nav {
  opacity: 0.75;
}

/* dynamic EXIF metadata panel: hover-triggered slide out */
.p-exif {
  background: rgba(20,20,20,0.95);
  border-left: 0.0625em solid #333;
  bottom: 0;
  height: 100vh;
  overflow: hidden;
  pointer-events: auto;
  position: absolute;
  right: 0;
  top: 0;
  transform: translateX(100%);
  transition: transform 0.3s ease;
  font-size: 0.8125em;
  text-align: right;
  width: 18em;
  z-index: 20;
}
.p-exif .p-scroll {
  /* ensure padding doesn't break the 100% height */
  box-sizing: border-box;
  height: 100%; width: 100%;
  overflow-y: auto;
  padding: 0em 1em;
}
.p-exif#bgcPanel {
  background-color: black;
  border-radius: 0em 0em 0em 0em;
  position: absolute;
  opacity: 0.75;
  z-index: 10;
}
.p-exif#divPanel {
  background-color: transparent;
}
.p-exif div#divBlack {
  cursor: default;
  background-color: black;
  height: 3.85em; width: 125%;
  margin: 0em -2em 0em -2em !important;
  padding: 0em 0em 0em 0em !important;
  position: absolute !important;
  top: 0em;
}
.p-exif .p-scroll h3 {
  color: lightsteelblue;
  background-color: #1F1F1F;
  border-bottom: 0.0625em solid #444;
  cursor: default;
  display: flex;
  flex-direction: row;
  justify-content: flex-end;
  margin: 0.75em -0.5em 0.75em -0.5em;
  padding: 0.5em 0.55em;
  position: sticky;
  top: 0.5em;
  vertical-align: middle;
  white-space: nowrap;
}
.p-exif-bar {
  line-height: 1.4;
  margin-bottom: 0.5em;
  overflow-wrap: break-word; /* Modern standard */
  word-wrap: break-word;     /* Legacy fallback for older browsers */
  white-space: normal;
}
.p-exif-tag {
  display: block;
  font-weight: bold;
  color: #888;
}

.p-number {
  color: gray;
  font-size: 0.875em;
  display: none;
}
.p-number::before {
  content: "(";
}
.p-number::after {
  content: ")";
}

.char-png {
  display: inline-block;
  height: 1.5em;
  padding: 0em 0.5em 0em 0.5em;
  vertical-align: middle;
  opacity: 0.25;
}
.char-png#gifStats {
  padding: 0em 0.25em 0.35em 0.25em;
  height: 2em;
}
.char-png#btnOpenP, .char-png#gifExifP {
  height: 1.25em;
  display: none;
}
.char-png#btnOpenP {
  cursor: pointer;
}

/* media overrides for portrait and mobile */
@media (max-width: 30em)
    or (orientation: portrait) {
  .box-album {
    height: 99vh;
    width: 99vw;
  }
  .box-album:hover .p-exif {
    transform: translateY(0);
  }
  .btn-nav {
    font-size: 1.25em;
    height: 2em;
    opacity: 0.5; /* Baseline safe visibility for mobile hardware screens */
    width: 2em;
  }
  .divCount, .divLinks {
    right: 0; left: auto;
  }
  .p-exif {
    border-left: none;
    border-top: 0.0625em solid #333;
    height: 35svh;
    top: auto;
    transform: translateY(100%);
    text-align: left;
    width: 100%;
    z-index: 15; /* Sub-layer stack depth behind overlay buttons */
  }
  .p-exif#bgcPanel {
    opacity: 0.75;
    z-index: 10;
  }
  .p-exif .p-scroll h3 #h3Header { order: 1 }
  .p-exif .p-scroll h3 #btnOpenP { order: 2 }
  .p-exif .p-scroll h3 #gifExifP { order: 3 }
  .p-exif .p-scroll h3 {
    justify-content: flex-start;
    margin-top: 0.55em;
  }
}
@media (pointer: coarse) {
  /* Styles specifically for touchscreen/mobile users */
  #lblFoldr {
    display: none;
  }
}