/* SNS Management — circular PDCA diagram */
/* Tighten section padding so it isn't so far from neighbours */
#services-sns .services{
  padding: 0 clamp(40px, 8vw, 120px) clamp(64px, 9vh, 120px) !important;
}
/* Reduce vertical gaps: heading block + matrix wrapper */
.sns-management-section .reveal{ margin-bottom: clamp(40px, 6vh, 80px) !important; gap: 8px !important; }
.stk-matrix-wrap{ padding-top: clamp(8px, 1.5vh, 20px) !important; }
.stk-pdca{
  margin-top: clamp(24px, 3vh, 44px);
  display: flex;
  justify-content: center;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .8s ease, transform .9s cubic-bezier(.19,1,.22,1);
}
.stk-pdca.is-vis{ opacity: 1; transform: none; }

.stk-pdca-stage{
  position: relative;
  width: min(680px, 92vw);
  aspect-ratio: 1;
  margin: 0 auto;
}

/* Per-step background image layers */
.stk-pdca-bg{ position: absolute; inset: 0; border-radius: 50%; overflow: hidden; z-index: 0; }

/* Large ZIHEN mark behind the circle — colour shifts bone→vermillion as step advances */
.stk-pdca-logo-wrap{
  position: absolute;
  inset: 9%;
  z-index: 0;
  pointer-events: none;
  filter: url(#stk-logo-wave);
}
.stk-pdca-logo{
  position: absolute;
  inset: 0;
  --step: 0;
  -webkit-mask: url(zihen-mark-white.png) center / contain no-repeat;
  mask: url(zihen-mark-white.png) center / contain no-repeat;
  background-color: var(--bone);
  opacity: .16;
}
.stk-logo-wave-defs{ position: absolute; width: 0; height: 0; }
.stk-pdca-bg-layer{
  position: absolute; inset: 0;
  opacity: 0;
  transition: opacity .6s ease;
}
.stk-pdca-bg-layer.is-on{ opacity: .5; }
.stk-pdca-bg-layer image-slot{ display: block; width: 100%; height: 100%; }
/* dim veil so center text stays readable over a photo */
.stk-pdca-bg::after{
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(242,238,232,.55) 30%, rgba(242,238,232,.82) 75%);
  pointer-events: none;
}

/* Ring SVG */
.stk-pdca-ring{
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  overflow: visible;
}
.pdca-ring-base{
  fill: none;
  stroke: rgba(14,14,14,.12);
  stroke-width: 1;
}
.pdca-ring-dash{
  fill: none;
  stroke: rgba(14,14,14,.20);
  stroke-width: 1;
  stroke-dasharray: 2 10;
}
.pdca-ring-spin{
  transform-origin: 200px 200px;
  animation: pdca-spin 40s linear infinite;
}
@keyframes pdca-spin{ to { transform: rotate(360deg); } }
.pdca-ring-prog{
  fill: none;
  stroke: var(--vermillion);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-dasharray: 942;           /* 2πr, r=150 */
  transform: rotate(-90deg);
  transform-origin: 200px 200px;
  transition: stroke-dashoffset .8s cubic-bezier(.22,1,.36,1);
  filter: drop-shadow(0 0 5px rgba(217,81,44,.4));
}
.pdca-arrows path{
  fill: none;
  stroke: rgba(14,14,14,.35);
  stroke-width: 1.4;
  stroke-linecap: round;
}

/* Center detail */
.stk-pdca-center{
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  width: 46%;
  text-align: center;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
}
.stk-pdca-eyebrow{
  font-family: var(--serif); font-style: italic; font-weight: 400;
  font-size: clamp(15px, 1.4vw, 20px); color: var(--earth);
  margin-bottom: 6px;
}
.stk-pdca-center-num{
  font-family: var(--mono); font-size: 11px; letter-spacing: .3em;
  color: var(--vermillion);
}
.stk-pdca-center-jp{
  font-family: var(--sans); font-weight: 400;
  font-size: clamp(22px, 2.4vw, 34px); letter-spacing: .04em;
  color: var(--ink); line-height: 1.4;
}
.stk-pdca-center-en{
  font-family: var(--serif); font-style: italic; font-weight: 300;
  font-size: clamp(13px, 1.2vw, 17px); color: var(--stone); letter-spacing: .04em;
}
.stk-pdca-center-body{
  font-family: var(--sans); font-weight: 300;
  font-size: clamp(12px, 1.05vw, 14px); line-height: 1.85; letter-spacing: .03em;
  color: var(--earth); margin-top: 8px; max-width: 26ch;
}

/* Nodes */
.stk-pdca-node{
  position: absolute;
  appearance: none; border: 0; background: transparent; cursor: pointer;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 10px;
  transition: transform .35s cubic-bezier(.19,1,.22,1);
}
.node-top{ top: -2%; left: 50%; transform: transl(-50%, 0); transform: translateX(-50%); }
.node-right{ right: -2%; top: 50%; transform: translateY(-50%); }
.node-bottom{ bottom: -2%; left: 50%; transform: translateX(-50%); }
.node-left{ left: -2%; top: 50%; transform: translateY(-50%); }

.pdca-node-dot{
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--bone-soft);
  border: 1px solid rgba(14,14,14,.4);
  transition: background .3s ease, border-color .3s ease, transform .3s ease;
}
.pdca-node-num{
  font-family: var(--mono); font-size: 10px; letter-spacing: .26em;
  color: var(--stone);
}
.pdca-node-jp{
  font-family: var(--sans); font-weight: 400;
  font-size: clamp(14px, 1.3vw, 18px); letter-spacing: .08em;
  color: var(--earth);
  white-space: nowrap;
  transition: color .3s ease;
}
.stk-pdca-node.is-active .pdca-node-dot{
  background: var(--vermillion); border-color: var(--vermillion);
  transform: scale(1.4);
  box-shadow: 0 0 12px rgba(217,81,44,.5);
}
.stk-pdca-node.is-active .pdca-node-jp{ color: var(--ink); }
.stk-pdca-node.is-active .pdca-node-num{ color: var(--vermillion); }

@media (max-width: 720px){
  .stk-pdca-stage{ width: 94vw; }
  .stk-pdca-center{ width: 56%; }
  .stk-pdca-center-body{ display: none; }
  .pdca-node-jp{ font-size: 13px; }
  /* Disable the turbulence wave on mobile — it janks/looks buggy on phones */
  .stk-pdca-logo-wrap{ filter: none !important; }
}

/* Image-add placeholder (background drop zone) removed until photos are ready */
.stk-pdca-bg-layer{ display: none !important; }

/* ── SNS Management background → footer gray (--ink-soft), dark theme ── */
#services-sns .services,
#services-sns .sub-section.sns-management-section{
  background: var(--ink-soft) !important;
  color: var(--bone) !important;
}
.sns-management-section .reveal .sub-h.tw-heading{ color: var(--bone) !important; }
.sns-management-section .reveal .sub-jp{ color: var(--stone-light) !important; }
.sns-management-section .sns-intro{ color: var(--stone-light) !important; }

/* Diagram veil → dark so a dropped photo sits on the gray */
.stk-pdca-bg::after{
  background: radial-gradient(circle at 50% 50%, rgba(26,26,26,.50) 30%, rgba(26,26,26,.82) 75%) !important;
}
/* Ring + arrows → light strokes on dark */
.pdca-ring-base{ stroke: rgba(242,238,232,.14) !important; }
.pdca-ring-dash{ stroke: rgba(242,238,232,.22) !important; }
.pdca-arrows path{ stroke: rgba(242,238,232,.38) !important; }
/* Center text → light */
.stk-pdca-eyebrow{ color: var(--stone-light) !important; }
.stk-pdca-center-jp{ color: var(--bone) !important; }
.stk-pdca-center-en{ color: var(--stone-light) !important; }
.stk-pdca-center-body{ color: var(--stone-light) !important; }
/* Nodes → light */
.pdca-node-dot{ background: var(--ink) !important; border-color: rgba(242,238,232,.5) !important; }
.pdca-node-num{ color: var(--stone-light) !important; }
.pdca-node-jp{ color: var(--stone-light) !important; }
.stk-pdca-node.is-active .pdca-node-jp{ color: var(--bone) !important; }
/* Matrix text (if shown) → light */
.stk-axis-col-en, .stk-axis-row-en{ color: var(--bone) !important; }
.stk-axis-col-jp, .stk-axis-row-jp{ color: var(--stone-light) !important; }
.stk-cell-jp{ color: var(--bone) !important; }


/* ════════════════════════════════════════════════════════════
   SNS Management — 4-quadrant grid (replaces circular PDCA)
   Default: each quadrant waves; hover stops the wave (settles).
   ════════════════════════════════════════════════════════════ */
.stk-quad-wrap{ position: relative; margin-top: clamp(40px, 6vh, 80px); }
.stk-quad-wave-defs{ position: absolute; width: 0; height: 0; }
.stk-quad-grid{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(16px, 1.8vw, 26px);
  max-width: 1000px;
  margin: 0 auto;
}
.stk-quad{
  position: relative;
  background: var(--ink);
  border: 1px solid rgba(242,238,232,.14);
  padding: clamp(24px, 2.6vw, 40px);
  min-height: clamp(180px, 22vh, 240px);
  display: flex;
  flex-direction: column;
  gap: 18px;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .7s ease var(--d,0s), transform .7s cubic-bezier(.19,1,.22,1) var(--d,0s), border-color .35s ease, background .35s ease;
  filter: url(#stk-quad-wave);
  will-change: filter;
}
.stk-quad-wrap.is-vis .stk-quad{ opacity: 1; transform: none; }
/* Hover: stop the wave, settle, vermillion frame */
.stk-quad:hover{
  filter: none;
  background: #161310;
  border-color: var(--vermillion);
}
@media (prefers-reduced-motion: reduce){
  .stk-quad{ filter: none; }
}

.stk-quad-head{
  display: flex; align-items: baseline; gap: 14px;
}
.stk-quad-num{
  font-family: var(--mono); font-size: 12px; letter-spacing: .26em;
  color: var(--vermillion);
}
.stk-quad-axis{
  font-family: var(--mono); font-size: 10px; letter-spacing: .28em;
  text-transform: uppercase; color: var(--stone);
}
.stk-quad-body{ display: flex; flex-direction: column; gap: 12px; }
.stk-quad-jp{
  font-family: 'Shippori Mincho','Hiragino Mincho ProN',serif; font-weight: 600;
  font-size: clamp(20px, 2vw, 28px); line-height: 1.3; letter-spacing: .02em;
  color: var(--bone); margin: 0;
}
.stk-quad-en{
  font-family: Georgia,'Times New Roman',serif; font-style: italic;
  font-size: 13px; letter-spacing: .04em; color: var(--stone-light);
}
.stk-quad-rule{ width: 40px; height: 1px; background: rgba(217,81,44,.55); margin: 4px 0; }
.stk-quad-text{
  font-family: 'Shippori Mincho','Hiragino Mincho ProN',serif; font-weight: 300;
  font-size: 14px; line-height: 2.0; letter-spacing: .04em;
  color: var(--stone-light); margin: 0;
}
@media (max-width: 720px){
  .stk-quad-grid{ grid-template-columns: 1fr; gap: 14px; }
  .stk-quad{ min-height: 0; padding: 24px; }
}