/* ═══════════════════════════════════════════════════
   SEC 4 — THE NEURAL MAP
   Tron Light-Beam Edition — 8 skill categories
   Technique: CSS @property rotating conic-gradient
   border per card, circuit grid background, glassmorphism
═══════════════════════════════════════════════════ */

/* ── Animated border angle ── */
@property --bn-angle {
  syntax: '<angle>';
  initial-value: 0deg;
  inherits: false;
}

/* ─────────────────────────────────────────────────
   SECTION BACKGROUND
───────────────────────────────────────────────── */
#s4 {
  background:
    radial-gradient(ellipse at 50% 50%, rgba(0,242,255,.05) 0%, transparent 65%),
    var(--obs);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 80px 24px 60px;
  position: relative;
  overflow: hidden;
}

/* Grid lines */
#s4::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: .32;
  background-image:
    linear-gradient(0deg,
      transparent calc(100% - 1px),
      rgba(0,242,255,.065) 100%
    ),
    linear-gradient(90deg,
      transparent calc(100% - 1px),
      rgba(0,242,255,.065) 100%
    );
  background-size: 56px 56px;
  animation: s4-grid-drift 24s linear infinite;
}

/* Grid intersection dots */
#s4::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image: radial-gradient(circle, rgba(0,242,255,.14) 1px, transparent 1px);
  background-size: 56px 56px;
  animation: s4-grid-drift 24s linear infinite;
}

@keyframes s4-grid-drift {
  from { background-position: 0 0; }
  to   { background-position: 56px 56px; }
}

#s4 .sec-hdr,
#s4 .bento-grid {
  position: relative;
  z-index: 2;
}

#s4 .sec-hdr {
  margin-bottom: 48px;
}

/* ─────────────────────────────────────────────────
   BENTO GRID — 4 cols desktop → 2 cols tablet → 1 col mobile
   8 cards sit in two rows of 4.
───────────────────────────────────────────────── */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

/* ─────────────────────────────────────────────────
   BEAM FRAME — rotating conic-gradient "border"
───────────────────────────────────────────────── */
.bn-frame {
  --bn-angle: 0deg;
  --bn-color: 0,242,255;
  --bn-speed: 5.5s;

  position: relative;
  padding: 1.5px;

  background: conic-gradient(
    from var(--bn-angle),
    rgba(var(--bn-color), .05)   0%,
    rgba(var(--bn-color), .05)  60%,
    rgba(var(--bn-color), .50)  72%,
    rgba(var(--bn-color), .92)  78%,
    rgba(255,255,255, .88)      80%,
    rgba(var(--bn-color), .92)  82%,
    rgba(var(--bn-color), .50)  88%,
    rgba(var(--bn-color), .05) 100%
  );

  animation: bn-beam-spin var(--bn-speed) linear infinite;
  transition: --bn-speed .4s;

  box-shadow:
    0 0 24px rgba(var(--bn-color), .05),
    0 8px 40px rgba(0,0,0,.6);
}

@keyframes bn-beam-spin { to { --bn-angle: 360deg; } }

.bn-frame:hover {
  --bn-speed: 1.6s;
  box-shadow:
    0 0 44px rgba(var(--bn-color), .22),
    0 0 88px rgba(var(--bn-color), .08),
    0 14px 56px rgba(0,0,0,.75);
}

/* ─────────────────────────────────────────────────
   BENTO CARD — glassmorphic inner panel
───────────────────────────────────────────────── */
.bento-card {
  position: relative;
  width: 100%;
  height: 100%;
  padding: 22px 20px 18px;
  background: linear-gradient(145deg,
    rgba(4, 10, 30, .95),
    rgba(2,  5, 18, .98)
  );
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 0;
  transition: background .35s;
  border: none;
  border-radius: 0;
  clip-path: none;
}

/* Top accent beam line */
.bento-card .bc-top {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg,
    transparent,
    rgba(var(--bn-color), .6),
    rgba(255,255,255,.8),
    rgba(var(--bn-color), .6),
    transparent
  );
  opacity: .38;
  transition: opacity .35s;
  z-index: 2;
  pointer-events: none;
}
.bn-frame:hover .bc-top { opacity: 1; }

/* Inner hover shimmer */
.bento-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(165deg,
    rgba(var(--bn-color), .045) 0%,
    transparent 50%
  );
  opacity: 0;
  transition: opacity .35s;
  pointer-events: none;
  z-index: 0;
}
.bn-frame:hover .bento-card::before { opacity: 1; }

/* Scanlines */
.bento-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(var(--bn-color), .013) 2px,
    rgba(var(--bn-color), .013) 3px
  );
  pointer-events: none;
  z-index: 0;
}

.bento-card > * { position: relative; z-index: 1; }

/* ─────────────────────────────────────────────────
   CARD HEADER
───────────────────────────────────────────────── */
.bento-header {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  margin-bottom: 16px;
  padding-bottom: 13px;
  border-bottom: 1px solid rgba(var(--bn-color), .14);
  transition: border-color .35s;
}
.bn-frame:hover .bento-header { border-color: rgba(var(--bn-color), .3); }

.bento-icon {
  font-size: 26px;
  line-height: 1;
  flex-shrink: 0;
  filter: drop-shadow(0 0 10px rgba(var(--bn-color), .55));
  transition: filter .35s, transform .3s;
}
.bn-frame:hover .bento-icon {
  filter: drop-shadow(0 0 22px rgba(var(--bn-color), .9));
  transform: scale(1.08);
}

.bento-head-text { flex: 1; }

.bento-title {
  font-family: var(--fd);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .12em;
  color: #ffffff;
  text-shadow: 0 0 12px rgba(var(--bn-color), .35);
  line-height: 1.2;
  margin-bottom: 5px;
  transition: text-shadow .35s;
}
.bn-frame:hover .bento-title {
  text-shadow: 0 0 24px rgba(var(--bn-color), .65);
}

.bento-prefix {
  color: rgba(var(--bn-color), .8);
  margin-right: 6px;
  font-size: 10px;
}

.bento-desc {
  font-size: 9.5px;
  color: rgba(210,228,252,.62);
  letter-spacing: .04em;
  line-height: 1.5;
}

.bento-badge {
  display: inline-flex;
  align-items: center;
  margin-top: 6px;
  padding: 2px 9px;
  background: rgba(var(--bn-color), .08);
  border: 1px solid rgba(var(--bn-color), .22);
  font-size: 8px;
  letter-spacing: .14em;
  color: rgba(var(--bn-color), .9);
  clip-path: polygon(4px 0, 100% 0, calc(100% - 4px) 100%, 0 100%);
  transition: background .25s, border-color .25s;
}
.bn-frame:hover .bento-badge {
  background: rgba(var(--bn-color), .15);
  border-color: rgba(var(--bn-color), .45);
}

/* ─────────────────────────────────────────────────
   TECH TAGS
───────────────────────────────────────────────── */
.tech-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  flex: 1;
  margin-bottom: 14px;
  align-content: flex-start;
}

.tech-tag {
  font-family: var(--fm);
  font-size: 9.5px;
  padding: 5px 11px;
  background: rgba(0, 8, 24, .72);
  border: 1px solid rgba(var(--bn-color), .28);
  color: rgba(220,236,255, .88);
  letter-spacing: .05em;
  clip-path: polygon(4px 0, 100% 0, calc(100% - 4px) 100%, 0 100%);
  cursor: default;
  position: relative;
  overflow: hidden;
  transition: background .22s, border-color .22s, color .22s, transform .18s, box-shadow .22s;
}

/* Shimmer swipe on tag hover */
.tech-tag::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg,
    transparent,
    rgba(var(--bn-color), .12),
    transparent
  );
  transform: translateX(-120%);
  transition: transform .45s;
}

.tech-tag:hover {
  background: rgba(var(--bn-color), .12);
  border-color: rgba(var(--bn-color), .65);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow:
    0 4px 18px rgba(0,0,0,.4),
    0 0 14px rgba(var(--bn-color), .18);
}
.tech-tag:hover::before { transform: translateX(120%); }

/* ─────────────────────────────────────────────────
   CARD FOOTER
───────────────────────────────────────────────── */
.bento-footer {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 12px;
  border-top: 1px solid rgba(var(--bn-color), .1);
  margin-top: auto;
  transition: border-color .35s;
}
.bn-frame:hover .bento-footer { border-color: rgba(var(--bn-color), .24); }

.pulse-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--nm);
  box-shadow: 0 0 8px var(--nm);
  animation: bn-pulse 2.2s ease-in-out infinite;
  flex-shrink: 0;
}
@keyframes bn-pulse {
  0%,100% { opacity: .4; transform: scale(1); }
  50%      { opacity: 1;  transform: scale(1.25); }
}

.footer-text {
  font-size: 7.5px;
  letter-spacing: .18em;
  color: rgba(200,218,245,.45);
  text-transform: uppercase;
  flex: 1;
  transition: color .35s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.bn-frame:hover .footer-text { color: rgba(200,218,245,.7); }

.footer-count {
  font-family: var(--fd);
  font-size: 9px;
  letter-spacing: .1em;
  color: rgba(var(--bn-color), .8);
  transition: color .35s, text-shadow .35s;
  flex-shrink: 0;
}
.bn-frame:hover .footer-count {
  color: rgba(var(--bn-color), 1);
  text-shadow: 0 0 12px rgba(var(--bn-color), .6);
}

/* ─────────────────────────────────────────────────
   AUTOMATION CARD — radial pulse background
───────────────────────────────────────────────── */
.bento-card.automation .bc-pulse-bg {
  position: absolute;
  top: 50%; left: 50%;
  width: 100%; height: 100%;
  background: radial-gradient(circle at center, rgba(180,77,255,.1) 0%, transparent 68%);
  transform: translate(-50%,-50%) scale(.8);
  opacity: 0;
  animation: bc-auto-pulse 3.2s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}
@keyframes bc-auto-pulse {
  0%,100% { opacity: 0;   transform: translate(-50%,-50%) scale(.8); }
  50%      { opacity: .55; transform: translate(-50%,-50%) scale(1.6); }
}

/* ─────────────────────────────────────────────────
   DATA SCIENCE CARD — subtle pink radial glow
───────────────────────────────────────────────── */
.bento-card.datascience::before {
  background: linear-gradient(165deg,
    rgba(255,100,160,.04) 0%,
    transparent 55%
  );
}

/* ─────────────────────────────────────────────────
   MONITORING CARD — warm amber radial glow
───────────────────────────────────────────────── */
.bento-card.monitoring::before {
  background: linear-gradient(165deg,
    rgba(255,165,0,.04) 0%,
    transparent 55%
  );
}

/* ─────────────────────────────────────────────────
   RESPONSIVE
───────────────────────────────────────────────── */

/* Large tablet / small desktop — 2 columns */
@media (max-width: 1100px) {
  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    max-width: 860px;
  }
}

/* Narrow tablet — still 2 columns, tighter */
@media (max-width: 800px) {
  .bento-grid {
    gap: 13px;
  }
  .bento-card { padding: 18px 16px 15px; }
  .bento-title { font-size: 10.5px; }
  .bento-desc  { font-size: 9px; }
}

/* Mobile — single column */
@media (max-width: 580px) {
  #s4 { padding: 68px 14px 48px; }

  .bento-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .bento-card { padding: 20px 16px 16px; }
  .bento-title { font-size: 11px; }
  .bento-desc  { font-size: 9px; }
  .tech-tag    { font-size: 9px; padding: 4px 10px; }

  /* Speed up beam on mobile so it's clearly visible at a glance */
  .bn-frame { --bn-speed: 3s; }
}

/* Graceful @property fallback */
@supports not (background: conic-gradient(from 1deg, red, blue)) {
  .bn-frame {
    background: linear-gradient(145deg,
      rgba(var(--bn-color), .3),
      rgba(var(--bn-color), .08)
    );
    animation: bn-fallback 5s linear infinite;
  }
  @keyframes bn-fallback {
    0%   { box-shadow: 2px 0 0 rgba(var(--bn-color),.8), 0 0 20px rgba(var(--bn-color),.1); }
    25%  { box-shadow: 0 2px 0 rgba(var(--bn-color),.8), 0 0 20px rgba(var(--bn-color),.1); }
    50%  { box-shadow: -2px 0 0 rgba(var(--bn-color),.8), 0 0 20px rgba(var(--bn-color),.1); }
    75%  { box-shadow: 0 -2px 0 rgba(var(--bn-color),.8), 0 0 20px rgba(var(--bn-color),.1); }
    100% { box-shadow: 2px 0 0 rgba(var(--bn-color),.8), 0 0 20px rgba(var(--bn-color),.1); }
  }
}

/* ── Touch devices: beam always runs; tap triggers card glow ── */
@media (hover: none) {
  /* Beam runs at medium speed by default so it's always visible */
  .bn-frame { --bn-speed: 3.5s; }

  /* Tap glow on bento cards */
  .bn-frame:active {
    --bn-speed: 1s;
    box-shadow:
      0 0 44px rgba(var(--bn-color), .28),
      0 0 88px rgba(var(--bn-color), .1),
      0 14px 56px rgba(0,0,0,.75);
  }
  .bn-frame:active .bc-top { opacity: 1; }
  .bn-frame:active .bento-card::before { opacity: 1; }
  .bn-frame:active .bento-title {
    text-shadow: 0 0 24px rgba(var(--bn-color), .65);
  }
  .bn-frame:active .bento-icon {
    filter: drop-shadow(0 0 22px rgba(var(--bn-color), .9));
    transform: scale(1.08);
  }
  .bn-frame:active .bento-badge {
    background: rgba(var(--bn-color), .15);
    border-color: rgba(var(--bn-color), .45);
  }
  .bn-frame:active .footer-text { color: rgba(200,218,245,.7); }
  .bn-frame:active .footer-count {
    color: rgba(var(--bn-color), 1);
    text-shadow: 0 0 12px rgba(var(--bn-color), .6);
  }

  /* Tech tag tap glow */
  .tech-tag:active {
    background: rgba(var(--bn-color), .15);
    border-color: rgba(var(--bn-color), .7);
    color: #ffffff;
    box-shadow: 0 0 14px rgba(var(--bn-color), .22);
  }
  .tech-tag:active::before { transform: translateX(120%); }
}