/* Index page styles — The Mechanical Researcher */
/* Desk scene with card stack */
/* All sizes proportional via vw/vh/vmin/% — no fixed pixel dimensions */

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

html, body {
  height: 100%;
  overflow: hidden;
  font-family: 'IBM Plex Sans', sans-serif;
}

/* --- Desk scene --- */

.desk-scene {
  width: 100%;
  height: 100%;
  /* Light warm wood base color */
  background-color: #d4b896;
  /* Wood grain: converging lines for oblique perspective feel */
  background-image:
    /* Broad grain bands — slightly converging toward top (oblique) */
    repeating-linear-gradient(
      178deg,
      transparent,
      transparent 2.5vh,
      rgba(160,120,75,0.12) 2.5vh,
      rgba(160,120,75,0.12) 2.8vh,
      transparent 2.8vh,
      transparent 4vh
    ),
    /* Fine grain lines */
    repeating-linear-gradient(
      178deg,
      transparent,
      transparent 0.9vh,
      rgba(140,105,65,0.07) 0.9vh,
      rgba(140,105,65,0.07) 1vh
    ),
    /* Subtle knot / color variation */
    radial-gradient(
      ellipse 40vw 25vh at 30% 60%,
      rgba(190,150,100,0.25) 0%,
      transparent 100%
    ),
    radial-gradient(
      ellipse 30vw 20vh at 75% 35%,
      rgba(175,135,90,0.2) 0%,
      transparent 100%
    ),
    /* Oblique shading — lighter at top (further), darker at bottom (closer) */
    linear-gradient(
      to bottom,
      rgba(255,245,225,0.3) 0%,
      transparent 30%,
      rgba(0,0,0,0.06) 100%
    );
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.desk-surface {
  position: absolute;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* Make mug clickable */
.mug {
  pointer-events: auto;
  cursor: pointer;
}

/* --- Mug (teal diner mug, oblique 3D view from above) --- */
/* Proportions: ~3.25" diameter body, ~4.5" with handle, vs 5" card width */
/* Card stack is 18vmin wide, so mug body ≈ 12vmin wide */

.mug {
  position: absolute;
  left: 22%;
  top: 26%;
  width: 12vmin;
  height: 14vmin;
  /* Cylindrical body — horizontal gradient for left/right curvature shading */
  background:
    linear-gradient(
      90deg,
      #1a6b6b 0%,
      #2a8a8a 12%,
      #35a0a0 30%,
      #3bb0ab 48%,
      #35a0a0 66%,
      #2a8a8a 85%,
      #1a6b6b 100%
    );
  border-radius: 50% 50% 50% 50% / 3% 3% 5% 5%;
  box-shadow:
    0.4vmin 0.8vmin 2vmin rgba(0,0,0,0.35),
    -0.15vmin 0 0.4vmin rgba(0,0,0,0.1);
}

/* Chip in the rim — small notch on the left edge */
.mug-chip {
  position: absolute;
  top: 0.2vmin;
  left: 1.5vmin;
  width: 1.2vmin;
  height: 0.8vmin;
  background: #d4b896; /* desk wood color showing through */
  border-radius: 0 0 50% 50%;
  z-index: 5;
  box-shadow: inset 0 0.1vmin 0.2vmin rgba(0,0,0,0.15);
}

/* Elliptical rim (top opening — seen from oblique above) */
.mug::before {
  content: '';
  position: absolute;
  top: -1.2vmin;
  left: -0.2vmin;
  width: calc(100% + 0.4vmin);
  height: 5vmin;
  border-radius: 50%;
  /* Thick rim edge */
  border: 0.4vmin solid #1a6b6b;
  /* Tea/coffee liquid inside — darker center, lighter edge (meniscus) */
  background:
    radial-gradient(
      ellipse 70% 60% at 45% 50%,
      #3a2210 0%,
      #5c3a1e 35%,
      #7a5533 65%,
      #1a6b6b 100%
    );
  box-shadow:
    inset 0 0.3vmin 0.8vmin rgba(0,0,0,0.3),
    inset 0 -0.15vmin 0.4vmin rgba(255,255,255,0.08);
}

/* Elliptical base (bottom of cylinder — overlaps body to avoid gap) */
.mug-base {
  position: absolute;
  bottom: -0.6vmin;
  left: -0.2vmin;
  width: calc(100% + 0.4vmin);
  height: 3vmin;
  border-radius: 50%;
  background:
    linear-gradient(
      90deg,
      #155858 0%,
      #1a6b6b 30%,
      #228080 50%,
      #1a6b6b 70%,
      #155858 100%
    );
  box-shadow: 0 0.4vmin 1vmin rgba(0,0,0,0.25);
  z-index: -1;
  clip-path: inset(50% 0 0 0);
}

/* Handle — thick C-shape, diner style, flush against body */
.mug::after {
  content: '';
  position: absolute;
  right: -2.5vmin;
  top: 20%;
  width: 3vmin;
  height: 5.5vmin;
  border: 0.7vmin solid transparent;
  border-right-color: #2a8a8a;
  border-top-color: #2a8a8a;
  border-bottom-color: #2a8a8a;
  border-radius: 0 50% 50% 0;
  /* Shading on handle */
  background:
    linear-gradient(
      180deg,
      #35a0a0 0%,
      #3bb0ab 30%,
      #35a0a0 70%,
      #2a8a8a 100%
    );
  background-clip: padding-box;
  box-shadow: 0.2vmin 0.3vmin 0.6vmin rgba(0,0,0,0.2);
}

/* --- Pen --- */

.pen {
  position: absolute;
  left: 38%;
  bottom: 18%;
  width: 12vmin;
  height: 0.7vmin;
  background: linear-gradient(90deg, #1a1512 0%, #1a1512 75%, #c4a44a 75%, #c4a44a 85%, #1a1512 85%);
  border-radius: 0.15vmin 0.35vmin 0.35vmin 0.15vmin;
  transform: rotate(-12deg);
  box-shadow: 0.1vmin 0.2vmin 0.6vmin rgba(0,0,0,0.3);
  pointer-events: auto;
  cursor: pointer;
}

.pen::before {
  content: '';
  position: absolute;
  left: -0.9vmin;
  top: 0.08vmin;
  width: 1vmin;
  height: 0.5vmin;
  background: linear-gradient(90deg, #8b7a68, #1a1512);
  clip-path: polygon(0 50%, 100% 0, 100% 100%);
}

/* --- Card stack (decorative pile on desk, oblique view) --- */

.card-stack {
  position: absolute;
  right: 14%;
  top: 42%;
  transform: translateY(-50%) perspective(50vmin) rotateX(45deg);
  transform-style: preserve-3d;
  width: 18vmin;
  height: calc(18vmin * 3 / 5);  /* 5:3 aspect ratio */
  pointer-events: none;
}

/* --- Active card area (where the zoomed card lives) --- */

.active-card-area {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 5;
  pointer-events: none;
}

/* --- Index card --- */

.index-card {
  position: absolute;
  background: transparent;
  border: none;
  border-radius: 0.6vmin;
  cursor: pointer;
  pointer-events: auto;
  transform-origin: center center;
  will-change: transform, opacity;
  transition: none;
  transform-style: preserve-3d;
}

.index-card .card-date {
  position: absolute;
  top: 1em;
  right: 1em;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7em;
  color: #8b7a68;
}

.index-card .card-revised {
  position: absolute;
  top: 2.4em;
  right: 1em;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.6em;
  color: #a8967e;
  font-style: italic;
}

.index-card .card-category {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7em;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #8b7a68;
  margin-bottom: 0.3em;
}

.index-card .card-title {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 1.8em;
  font-weight: 600;
  color: #1a1512;
  line-height: 1.3;
  margin-bottom: 0.4em;
}

.index-card .card-abstract {
  font-family: 'IBM Plex Sans Condensed', sans-serif;
  font-size: 1.1em;
  color: #4a3f35;
  line-height: 1.5;
}

.index-card .card-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  margin-top: 0.6em;
}

.card-permalink {
  font-size: 0.8em;
  text-decoration: none;
  color: #8b7a68;
  opacity: 0.5;
  transition: opacity 0.15s ease;
  cursor: pointer;
}

.card-permalink:hover {
  opacity: 1;
}

/* --- Card back (visible during flip) --- */

.index-card .card-back {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  visibility: hidden;
  background: #fffef7;
  border: 1px solid #d4c9b8;
  overflow: hidden;
  box-shadow:
    0 0.2vmin 0.8vmin rgba(0,0,0,0.15),
    0 0.1vmin 0.2vmin rgba(0,0,0,0.1);
}

/* Back face styles — applied randomly via data-back attribute */
.index-card .card-back[data-back="lines"] {
  background-image:
    repeating-linear-gradient(
      transparent,
      transparent 2.4vmin,
      #c8dae8 2.4vmin,
      #c8dae8 calc(2.4vmin + 1px)
    );
  background-position: 0 1.2vmin;
}

.index-card .card-back[data-back="stain"] {
  background-image:
    radial-gradient(
      ellipse 35% 40% at 65% 40%,
      rgba(140, 100, 60, 0.12) 0%,
      rgba(140, 100, 60, 0.06) 40%,
      transparent 70%
    ),
    radial-gradient(
      ellipse 20% 25% at 60% 45%,
      rgba(120, 80, 40, 0.08) 0%,
      transparent 60%
    );
}

.index-card .card-back[data-back="blank"] {
  /* just the cream card, nothing else */
}

.index-card .card-front {
  position: absolute;
  inset: 0;
  padding: 1em;
  background: #fffef7;
  border: 1px solid #d4c9b8;
  border-radius: inherit;
  box-shadow:
    0 0.2vmin 0.8vmin rgba(0,0,0,0.15),
    0 0.1vmin 0.2vmin rgba(0,0,0,0.1);
  background-image:
    repeating-linear-gradient(
      transparent,
      transparent 2.4vmin,
      #c8dae8 2.4vmin,
      #c8dae8 calc(2.4vmin + 1px)
    );
  background-position: 0 1.2vmin;
}

/* --- End card --- */

.index-card.end-card {
  background-image: none;
}

.index-card.end-card .card-front {
  display: flex;
  align-items: center;
  justify-content: center;
}

.index-card.end-card .card-title {
  text-align: center;
  color: #8b7a68;
  font-size: max(1rem, 2.2vmin);
}

/* --- Bottom bar --- */

.bottom-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  text-align: center;
  padding: 0.8vh 1vw;
  background: rgba(43, 30, 22, 0.85);
  backdrop-filter: blur(4px);
  z-index: 20;
}

.bottom-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8vmin;
}

.bottom-bar .site-title {
  font-family: 'IBM Plex Mono', monospace;
  font-size: max(0.6rem, 0.9vmin);
  color: #c4b8a4;
  letter-spacing: 0.05em;
}

.bottom-bar .github-link,
.bottom-bar .rss-link {
  color: #c4b8a4;
  opacity: 0.6;
  transition: opacity 0.15s ease;
  line-height: 1;
  display: flex;
}

.bottom-bar .github-link:hover,
.bottom-bar .rss-link:hover {
  opacity: 1;
}

/* --- Info button (on desk next to pen) --- */

.info-btn {
  position: absolute;
  left: 40%;
  bottom: 24%;
  width: 3vmin;
  height: 3vmin;
  min-width: 1.5rem;
  min-height: 1.5rem;
  border-radius: 50%;
  border: 0.15vmin solid #8b7a68;
  background: rgba(255, 254, 247, 0.8);
  color: #6b5b4a;
  font-family: 'IBM Plex Sans', sans-serif;
  pointer-events: auto;
  font-size: max(0.65rem, 1.4vmin);
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0.1vmin 0.4vmin rgba(0,0,0,0.15);
  transition: background 0.15s ease, transform 0.15s ease;
}

.info-btn:hover {
  background: #fffef7;
  transform: scale(1.1);
}

/* --- Info overlay --- */

.info-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(43, 30, 22, 0.7);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.info-overlay.active {
  display: flex;
}

.info-card {
  background: #fffef7;
  border: 1px solid #d4c9b8;
  border-radius: 8px;
  padding: 2.5rem;
  max-width: 32rem;
  width: 100%;
  box-shadow: 0 0.5vmin 2vmin rgba(0,0,0,0.3);
  position: relative;
  font-family: 'IBM Plex Sans Condensed', sans-serif;
  font-size: 1rem;
  color: #4a3f35;
  line-height: 1.7;
}

.info-card p {
  margin-bottom: 1em;
}

.info-card p:last-child {
  margin-bottom: 0;
}

.info-hint {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85em;
  color: #8b7a68;
  font-style: italic;
}

.info-close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  border: 1px solid #d4c9b8;
  background: #fffef7;
  color: #6b5b4a;
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.info-close:hover {
  background: #f0e8d8;
}

/* --- Brown packages (source downloads) --- */

.packages {
  position: absolute;
  left: 8%;
  bottom: 28%;
  width: 16vmin;
  height: 8vmin;
  pointer-events: auto;
  cursor: pointer;
  transform: perspective(50vmin) rotateX(40deg) rotate(-3deg);
  transform-style: preserve-3d;
}

.package {
  position: absolute;
  left: 0;
  width: 100%;
  border-radius: 0.3vmin;
  /* Kraft paper texture */
  background:
    repeating-linear-gradient(
      175deg,
      transparent,
      transparent 1.2vmin,
      rgba(160, 120, 70, 0.08) 1.2vmin,
      rgba(160, 120, 70, 0.08) 1.4vmin
    ),
    linear-gradient(180deg, #c9a06c, #b8914e);
  box-shadow:
    0 0.2vmin 0.8vmin rgba(0,0,0,0.25),
    inset 0 0.1vmin 0.3vmin rgba(255,255,255,0.15);
}

.package-bottom {
  bottom: 0;
  height: 55%;
  z-index: 1;
}

.package-top {
  bottom: 48%;
  height: 50%;
  width: 90%;
  left: 5%;
  z-index: 2;
}

/* Twine — horizontal and vertical cross lines */
.package::before,
.package::after {
  content: '';
  position: absolute;
  background: #a08060;
  z-index: 3;
}

/* Horizontal twine */
.package::before {
  top: 50%;
  left: 0;
  width: 100%;
  height: 0.15vmin;
  transform: translateY(-50%);
}

/* Vertical twine */
.package::after {
  left: 50%;
  top: 0;
  height: 100%;
  width: 0.15vmin;
  transform: translateX(-50%);
}

.packages:hover .package {
  filter: brightness(1.05);
}

/* --- Packages overlay (source downloads modal) --- */

.packages-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(43, 30, 22, 0.7);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.packages-overlay.active {
  display: flex;
}

.packages-modal {
  background: #fffef7;
  border: 1px solid #d4c9b8;
  border-radius: 8px;
  padding: 2rem;
  max-width: 36rem;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 0.5vmin 2vmin rgba(0,0,0,0.3);
  position: relative;
}

.packages-title {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 1.2rem;
  font-weight: 600;
  color: #1a1512;
  margin-bottom: 1.25rem;
}

.packages-close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  border: 1px solid #2c2420;
  background: #fffef7;
  color: #2c2420;
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.packages-close:hover {
  background: #f0e8d8;
}

/* Package index cards */
.pkg-card {
  background: #fffef7;
  border: 1px solid #d4c9b8;
  border-radius: 4px;
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
  /* Lined paper effect */
  background-image: repeating-linear-gradient(
    to bottom,
    transparent,
    transparent 1.6em,
    #e8dfd2 1.6em,
    #e8dfd2 1.65em
  );
  background-position: 0 0.4em;
}

.pkg-card-name {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  color: #1a1512;
  margin-bottom: 0.25rem;
}

.pkg-card-meta {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  color: #8b7a68;
  display: flex;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.pkg-card-links {
  display: flex;
  gap: 1rem;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.8rem;
}

.pkg-card-links a {
  color: #6b5b4a;
  text-decoration: none;
  border: 1px solid #2c2420;
  border-radius: 3px;
  padding: 0.2rem 0.5rem;
  background: #fffef7;
}

.pkg-card-links a:hover {
  background: #f0e8d8;
}

/* --- Mobile adjustments --- */

@media (max-width: 600px) {
  .mug {
    left: 10%;
    top: 14%;
    width: 16vmin;
    height: 18vmin;
  }

  .pen {
    left: 55%;
    bottom: 10%;
    width: 20vmin;
    height: 1.2vmin;
  }

  .info-btn {
    left: 58%;
    bottom: 16%;
    width: 5vmin;
    height: 5vmin;
    min-width: 2rem;
    min-height: 2rem;
    font-size: max(0.8rem, 2vmin);
  }

  .card-stack {
    right: 50%;
    top: 46%;
    transform: translateX(50%) translateY(-50%) perspective(50vmin) rotateX(45deg);
  }

  .index-card {
    border-radius: 4px;
    padding: 0.75em;
  }

  .bottom-bar {
    padding: 0.6vh 2vw;
  }

  .info-card {
    padding: 1.5rem;
    font-size: 0.9rem;
  }

  .packages {
    left: 70%;
    top: 12%;
    width: 14vmin;
    height: 7vmin;
  }
}

/* ========================================================
   Grid (exploded) view
   ======================================================== */

.grid-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: #d4b896;
  overflow-y: auto;
  overflow-x: hidden;
  display: none;
}

.grid-overlay.active {
  display: block;
}

.grid-close {
  position: fixed;
  top: 2vmin;
  right: 2vmin;
  z-index: 60;
  width: 5vmin;
  height: 5vmin;
  min-width: 2rem;
  min-height: 2rem;
  border-radius: 50%;
  border: 0.2vmin solid #8b7a68;
  background: #fffef7;
  color: #4a3f35;
  font-size: max(1rem, 2vmin);
  line-height: 1;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0.2vmin 0.8vmin rgba(0,0,0,0.15);
}

.grid-close:hover {
  background: #f0e8d8;
}

.grid-overlay.active ~ .grid-close {
  display: flex;
}

.grid-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3vmin;
  padding: 5vmin 4vw 8vmin;
  max-width: 80rem;
  margin: 0 auto;
}

@media (min-width: 600px) {
  .grid-container {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1000px) {
  .grid-container {
    grid-template-columns: repeat(3, 1fr);
  }
}

.grid-card {
  background: #fffef7;
  border: 1px solid #d4c9b8;
  border-radius: 0.6vmin;
  padding: 2vmin;
  aspect-ratio: 5 / 3;
  cursor: pointer;
  box-shadow:
    0 0.2vmin 0.8vmin rgba(0,0,0,0.15),
    0 0.1vmin 0.2vmin rgba(0,0,0,0.1);
  background-image:
    repeating-linear-gradient(
      transparent,
      transparent 2.4vmin,
      #c8dae8 2.4vmin,
      #c8dae8 calc(2.4vmin + 1px)
    );
  background-position: 0 1.2vmin;
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.grid-card:hover {
  transform: translateY(-0.3vmin);
  box-shadow:
    0 0.4vmin 1.2vmin rgba(0,0,0,0.2),
    0 0.2vmin 0.4vmin rgba(0,0,0,0.12);
}

.grid-card {
  position: relative;
}

.grid-card .card-date {
  position: absolute;
  top: 2vmin;
  right: 2vmin;
  font-family: 'IBM Plex Mono', monospace;
  font-size: max(0.55rem, 0.9vmin);
  color: #8b7a68;
}

.grid-card .card-revised {
  position: absolute;
  top: 4.5vmin;
  right: 2vmin;
  font-family: 'IBM Plex Mono', monospace;
  font-size: max(0.45rem, 0.75vmin);
  color: #a8967e;
  font-style: italic;
}

.grid-card .card-category {
  font-family: 'IBM Plex Mono', monospace;
  font-size: max(0.55rem, 0.9vmin);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #8b7a68;
  margin-bottom: 0.3vmin;
}

.grid-card .card-title {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: max(0.85rem, 1.6vmin);
  font-weight: 600;
  color: #1a1512;
  line-height: 1.3;
  margin-bottom: 0.5vmin;
}

.grid-card .card-abstract {
  font-family: 'IBM Plex Sans Condensed', sans-serif;
  font-size: max(0.7rem, 1.1vmin);
  color: #4a3f35;
  line-height: 1.5;
}

.grid-card .card-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  margin-top: auto;
  padding-top: 0.5vmin;
}