/* Negin Stone — Gohareh Limestone showroom.
   Single-theme dark and monochrome: only the stone and the factory photographs carry colour. */
:root{
  --bg:#0A0A0A;
  --surface:#121212;
  --ink:#F3F3F1;
  --muted:#A6A6A3;
  --faint:#5F5F5D;
  --line:#262626;
  --line-2:#333;
  --glass:rgba(10,10,10,.74);
  --hover:rgba(243,243,241,.06);
  --f-sans:Montserrat,"Helvetica Neue",Arial,sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
  --pad:max(20px, env(safe-area-inset-left, 0px));
  color-scheme:dark;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{
  background:var(--bg); color:var(--ink);
  font-family:var(--f-sans); font-weight:400; font-size:14px; line-height:1.55;
  -webkit-font-smoothing:antialiased; -moz-osx-font-smoothing:grayscale; text-rendering:optimizeLegibility;
  -webkit-tap-highlight-color:transparent;
}
button,select{font:inherit;color:inherit;-webkit-tap-highlight-color:transparent}
button{cursor:pointer}
:focus-visible{outline:1px solid var(--ink);outline-offset:3px}
[hidden]{display:none!important}
.vh{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
svg{stroke:currentColor;fill:none;stroke-width:1.3;stroke-linecap:round;stroke-linejoin:round}

/* ================= Layout ================= */
.app{
  /* One screen on desktop: every row is sized from the viewport, only the stage flexes */
  height:100vh; height:100dvh; min-height:540px;
  display:grid;
  grid-template-columns:340px minmax(0,1fr);
  grid-template-rows:auto minmax(0,1fr) auto auto;
  grid-template-areas:"top top" "info viewer" "rail rail" "foot foot";
  padding:0 var(--pad);
}

/* ================= Header ================= */
.top{grid-area:top;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0;border-bottom:1px solid var(--line);user-select:none;-webkit-user-select:none}
.brand{display:flex;align-items:center;gap:16px;min-width:0}
.mark{font-weight:600;font-size:13px;letter-spacing:.42em;text-transform:uppercase;white-space:nowrap}
.rule{width:28px;height:1px;background:var(--line-2);flex:none}
.sub{font-size:10.5px;letter-spacing:.24em;text-transform:uppercase;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.actions{display:flex;align-items:center;gap:14px;flex:none}
.back-link{display:inline-flex;align-items:center;gap:10px;height:32px;padding:0 16px 0 13px;border:1px solid var(--line);border-radius:999px;color:var(--muted);text-decoration:none;font-weight:500;font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;white-space:nowrap;transition:color .3s var(--ease),border-color .3s var(--ease),background-color .3s var(--ease)}
.back-link svg{width:14px;height:14px;flex:none;transition:transform .35s var(--ease)}
.back-link:hover{color:var(--ink);border-color:var(--faint);background:var(--hover)}
.back-link:hover svg{transform:translateX(-3px)}
.back-link:active{background:rgba(243,243,241,.1)}
.actions-sep{width:1px;height:16px;background:var(--line-2)}
.lang{display:flex;align-items:center;gap:10px;font-family:var(--f-mono);font-size:11px;letter-spacing:.14em}
.lang button{background:none;border:0;padding:6px 2px;color:var(--faint);transition:color .25s var(--ease);position:relative}
.lang button:hover{color:var(--muted)}
.lang button[aria-pressed="true"]{color:var(--ink)}
.lang button[aria-pressed="true"]::after{content:"";position:absolute;left:2px;right:2px;bottom:1px;height:1px;background:var(--ink)}
.lang-sep{width:1px;height:12px;background:var(--line-2)}

/* ================= Buttons ================= */
.btn{display:inline-flex;align-items:center;gap:9px;font-weight:500;font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;background:transparent;border:1px solid var(--line);border-radius:999px;padding:9px 16px;color:var(--muted);transition:border-color .3s var(--ease),background-color .3s var(--ease),color .3s var(--ease);white-space:nowrap}
.btn svg{width:13px;height:13px}
.btn:hover{border-color:var(--faint);color:var(--ink)}
.btn[aria-pressed="true"]{border-color:var(--muted);color:var(--ink);background:var(--hover)}
#compareBtn .i-x{display:none}
#compareBtn[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:var(--bg)}
#compareBtn[aria-pressed="true"] .i-x{display:block}
#compareBtn[aria-pressed="true"] .i-cmp{display:none}
.ibtn{width:32px;height:32px;border:0;background:transparent;border-radius:999px;display:grid;place-items:center;color:var(--muted);transition:color .25s var(--ease),background-color .25s var(--ease)}
.ibtn:hover{color:var(--ink);background:var(--hover)}
.ibtn svg{width:14px;height:14px}
.ibtn[aria-pressed="false"]{color:var(--faint)}
.ibtn[aria-pressed="true"]{color:var(--ink)}
.ibtn-line{border:1px solid var(--line)}
.fs-btn .i-exit{display:none}
.fs-btn.active .i-enter{display:none}
.fs-btn.active .i-exit{display:block}
.no-fs .fs-btn{display:none!important}

/* ================= Product information ================= */
.info{grid-area:info;padding:26px 32px 14px 0;min-width:0;min-height:0;display:flex;flex-direction:column;overflow-y:auto;scrollbar-width:none}
.info::-webkit-scrollbar{display:none}
.info-head,.info-body{display:flex;flex-direction:column}
.info-body{flex:1 0 auto}
.info-body > *{flex-shrink:0}
.eyebrow{font-family:var(--f-mono);font-weight:500;font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin:0;font-variant-numeric:tabular-nums}
.grade-title{margin:14px 0 0;font-weight:300;line-height:1.1}
.g-material{display:block;font-size:12px;font-weight:500;letter-spacing:.24em;text-transform:uppercase;color:var(--muted)}
.g-name{display:block;margin-top:10px;font-size:clamp(34px,min(4.4vw,7.2vh),64px);font-weight:300;letter-spacing:.04em;transition:opacity .35s var(--ease),transform .35s var(--ease)}
.swap{opacity:0!important;transform:translateY(6px)}
.note{font-size:13px;line-height:1.7;color:var(--muted);margin:16px 0 0;max-width:40ch;transition:opacity .35s var(--ease)}
.spec{display:grid;grid-template-columns:1fr 1fr;gap:16px 20px;margin:22px 0 22px;padding-top:18px;border-top:1px solid var(--line)}
.spec dt{font-family:var(--f-mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--faint)}
.spec dd{margin:6px 0 0;font-family:var(--f-mono);font-weight:500;font-size:12.5px;color:var(--ink);font-variant-numeric:tabular-nums}
.cta{margin-top:auto;align-self:flex-start;display:inline-flex;align-items:center;gap:14px;padding:15px 22px;border:1px solid var(--ink);color:var(--bg);background:var(--ink);text-decoration:none;font-weight:500;font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;line-height:1.4;transition:background-color .3s var(--ease),color .3s var(--ease)}
.cta svg{width:14px;height:14px;flex:none;transition:transform .3s var(--ease)}
.cta:hover{background:transparent;color:var(--ink)}
/* Desktop: the quote button stays visible at the foot of the info column, even when it scrolls */
@media (min-width:901px){ .cta{position:sticky;bottom:0;box-shadow:0 -14px 18px -6px var(--bg)} .cta:hover{background:var(--bg)} }
.cta:hover svg{transform:translateX(3px)}

/* ================= Viewer ================= */
.viewer{grid-area:viewer;min-width:0;min-height:0;display:flex;flex-direction:column;padding:16px 0 0}
.viewer-bar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-bottom:12px}
.modes{display:flex;gap:2px;border:1px solid var(--line);border-radius:999px;padding:3px}
.mode{display:inline-flex;align-items:baseline;gap:9px;border:0;background:transparent;border-radius:999px;padding:9px 18px;font-weight:500;font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--faint);transition:color .3s var(--ease),background-color .3s var(--ease);white-space:nowrap}
.mode:hover{color:var(--muted)}
.mode[aria-selected="true"]{background:var(--ink);color:var(--bg)}

.stage{
  position:relative;flex:1;min-height:0;overflow:hidden;isolation:isolate;border:1px solid var(--line);
  background:radial-gradient(52% 58% at 50% 50%, #151515 0%, var(--bg) 76%);
  user-select:none;-webkit-user-select:none;
}
.stage canvas{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:none;cursor:grab;outline:none;-webkit-touch-callout:none;transition:opacity .16s var(--ease)}
.stage canvas.dragging{cursor:grabbing}
.stage canvas.dip{opacity:0}
.stage canvas:focus-visible{box-shadow:inset 0 0 0 1px var(--faint)}
.comparing::after{content:"";position:absolute;top:0;bottom:0;left:50%;width:1px;background:var(--line);pointer-events:none;z-index:2}
.comparing[data-split="v"]::after{top:50%;bottom:auto;left:0;right:0;width:auto;height:1px}

.status{position:absolute;left:0;right:0;top:50%;transform:translateY(-50%);display:flex;justify-content:center;pointer-events:none;z-index:4}
.status span{font-family:var(--f-mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);background:var(--glass);border:1px solid var(--line);padding:9px 16px;border-radius:999px;max-width:80%;text-align:center}
.status.error span{text-transform:none;letter-spacing:.02em;font-family:var(--f-sans);font-size:13px;border-radius:4px;line-height:1.6}

/* Compare labels */
.cmp-labels{position:absolute;left:0;right:0;top:0;z-index:5;display:none;grid-template-columns:1fr 1fr;pointer-events:none}
.comparing .cmp-labels{display:grid}
.comparing[data-split="v"] .cmp-labels{grid-template-columns:1fr;grid-template-rows:1fr 1fr;bottom:0}
.cmp-tag{justify-self:start;align-self:start;margin:14px;pointer-events:auto;font-family:var(--f-mono);font-weight:500;font-size:11px;letter-spacing:.12em;color:var(--ink);background:var(--glass);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--line-2);border-radius:999px;padding:8px 14px}
.cmp-pick{position:relative;display:inline-flex;align-items:center;padding:0}
.cmp-pick select{appearance:none;-webkit-appearance:none;background:transparent;border:0;border-radius:999px;padding:8px 34px 8px 14px;font-family:var(--f-mono);font-weight:500;font-size:11px;letter-spacing:.12em;color:var(--ink);cursor:pointer}
.cmp-pick select option{background:#111;color:var(--ink)}
.cmp-pick svg{position:absolute;right:12px;width:12px;height:12px;pointer-events:none;color:var(--muted)}

/* Controls */
.controls{position:absolute;left:14px;right:14px;bottom:14px;z-index:5;display:flex;justify-content:space-between;align-items:flex-end;gap:10px;pointer-events:none}
.ctl-group{pointer-events:auto;display:flex;align-items:center;gap:2px;background:var(--glass);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--line);border-radius:999px;padding:3px;margin-left:auto}
.ctl-group.presets{margin-left:0}
.ctl-sep{width:1px;height:16px;background:var(--line-2);margin:0 4px}
.chip{border:0;background:transparent;border-radius:999px;padding:8px 12px;font-weight:500;font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);transition:color .25s var(--ease),background-color .25s var(--ease);white-space:nowrap}
.chip:hover{color:var(--ink);background:var(--hover)}
.preset-chips{display:flex;align-items:center;gap:2px}
.l-short{display:none}
.more{position:relative}
.menu{position:absolute;bottom:calc(100% + 10px);left:0;min-width:170px;display:flex;flex-direction:column;padding:4px;background:rgba(14,14,14,.94);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--line-2);border-radius:12px;z-index:6}
.menu-item{border:0;background:transparent;text-align:left;border-radius:8px;padding:10px 12px;font-weight:500;font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);white-space:nowrap;transition:color .2s var(--ease),background-color .2s var(--ease)}
.menu-item:hover,.menu-item:focus-visible{color:var(--ink);background:var(--hover);outline:none}
.cmp-only{display:none!important}
.comparing .cmp-only{display:grid!important}
.zoom-val{font-family:var(--f-mono);font-weight:500;font-size:10.5px;min-width:44px;text-align:center;font-variant-numeric:tabular-nums;color:var(--ink)}

/* Viewer footer */
.viewer-foot{display:flex;align-items:flex-start;justify-content:space-between;gap:24px;padding:10px 0 0}
.caption{margin:0;flex:1 1 280px;font-size:11.5px;line-height:1.6;color:var(--muted);max-width:72ch;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden}
.foot-right{display:flex;align-items:center;justify-content:flex-end;gap:8px 18px;flex:0 1 auto;flex-wrap:wrap}
.hint{font-family:var(--f-mono);font-size:10px;line-height:1.6;letter-spacing:.04em;color:var(--faint);text-align:right;max-width:46ch}
.link{display:inline-flex;align-items:center;gap:7px;color:var(--ink);text-decoration:none;font-weight:500;font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;border-bottom:1px solid var(--line-2);padding-bottom:3px;transition:border-color .25s var(--ease)}
.link svg{width:11px;height:11px}
.link:hover{border-color:var(--ink)}

/* Fullscreen viewer */
.viewer:fullscreen{background:var(--bg);padding:18px 22px}
.viewer:-webkit-full-screen{background:var(--bg);padding:18px 22px}

/* ================= Sorting selector ================= */
.rail{grid-area:rail;padding:14px 0 0;margin-top:14px;border-top:1px solid var(--line);user-select:none;-webkit-user-select:none}
.rail-title{margin:0 0 10px;font-family:var(--f-mono);font-weight:500;font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--faint)}
.grades{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:12px}
.grade{position:relative;width:100%;display:flex;flex-direction:column;gap:8px;padding:0 0 4px;border:0;background:transparent;text-align:left}
.grade-sw{display:block;width:100%;height:clamp(30px,6vh,56px);overflow:hidden;background:var(--surface);opacity:.55;transition:opacity .35s var(--ease)}
.grade-sw img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .7s var(--ease)}
.grade-meta{display:flex;align-items:baseline;justify-content:space-between;gap:8px;padding-top:8px;border-top:1px solid var(--line);position:relative}
.grade-meta::before{content:"";position:absolute;left:0;right:0;top:-1px;height:1px;background:var(--ink);transform:scaleX(0);transform-origin:left;transition:transform .45s var(--ease)}
.grade-name{font-weight:500;font-size:12px;letter-spacing:.12em;color:var(--faint);transition:color .3s var(--ease);white-space:nowrap}
.grade:hover .grade-sw{opacity:.85}
.grade:hover .grade-sw img{transform:scale(1.06)}
.grade:hover .grade-name{color:var(--muted)}
.grade[aria-pressed="true"] .grade-sw{opacity:1}
.grade[aria-pressed="true"] .grade-name{color:var(--ink)}
.grade[aria-pressed="true"] .grade-meta::before{transform:scaleX(1)}

/* ================= Footer ================= */
.foot{grid-area:foot;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:10px 0 calc(10px + env(safe-area-inset-bottom,0px));margin-top:12px;border-top:1px solid var(--line);font-size:10.5px;letter-spacing:.08em;color:var(--faint)}
.credit{font-family:var(--f-mono);letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}

/* ================= Responsive ================= */
/* Laptops: tighten spacing so everything stays on one screen; the info column scrolls on its own if needed */
@media (min-width:901px) and (max-height:780px){
  .top{padding:10px 0}
  .info{padding-top:18px}
  .eyebrow{display:none}
  .grade-title{margin-top:0}
  .note{font-size:12.5px;line-height:1.6;margin-top:12px}
  .spec{margin:16px 0 16px;padding-top:14px;gap:12px 16px}
  .cta{padding:12px 18px}
  .viewer{padding-top:12px}
  .viewer-bar{padding-bottom:10px}
  .mode{padding:8px 16px}
  .btn{padding:8px 14px}
  .hint{display:none}
  .caption{-webkit-line-clamp:1}
  .rail{margin-top:10px;padding-top:10px}
  .rail-title{margin-bottom:8px}
  .grade{gap:6px}
  .grade-meta{padding-top:6px}
  .foot{margin-top:8px;padding:8px 0}
}
@media (min-width:901px) and (max-height:640px){
  .viewer-foot,.rail-title{display:none}
  .note{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;overflow:hidden}
  .spec > div:nth-child(3){display:none}
}
@media (max-width:1180px){
  .app{grid-template-columns:290px minmax(0,1fr)}
  .info{padding-right:28px}
  .hint{display:none}
  .grades{gap:10px}
}
@media (max-width:900px){
  html,body{height:auto}
  .app{height:auto;min-height:0;grid-template-columns:minmax(0,1fr);grid-template-rows:auto;grid-template-areas:"top" "head" "viewer" "rail" "body" "foot";padding:0 max(16px, env(safe-area-inset-left,0px))}
  .info{display:contents}
  .info-head{grid-area:head;padding:22px 0 0}
  .info-body{grid-area:body;padding:26px 0 8px}
  .g-name{font-size:40px;margin-top:8px}
  .note{max-width:none}
  .cta{margin-top:28px;align-self:stretch;justify-content:space-between}
  .viewer{padding-top:16px}
  .viewer-bar{flex-wrap:wrap}
  .modes{flex:1 1 100%}
  .mode{flex:1;justify-content:center;padding:10px 6px;letter-spacing:.1em}
  #compareBtn{margin-left:auto}
  .stage{flex:none;height:clamp(380px,64vh,640px)}
  .stage.comparing{height:clamp(520px,84vh,900px)}
  .viewer-foot{flex-direction:column;gap:10px}
  .caption{flex:none}
  .foot-right{justify-content:flex-start}
  .rail{margin-top:14px}
  .grades{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;gap:10px;padding-bottom:6px;scrollbar-width:none}
  .grades::-webkit-scrollbar{display:none}
  .grades li{flex:0 0 112px;scroll-snap-align:start}
  .chip{padding:8px 9px}
  .cmp-tag{align-self:start;margin:10px}
}
@media (max-width:760px){
  .back-link{width:32px;padding:0;justify-content:center}
  .back-label{display:none}
  .actions{gap:10px}
  .actions-sep{display:none}
}
@media (max-width:560px){
  .sub,.rule{display:none}
  .mark{letter-spacing:.3em}
  .l-long{display:none}
  .l-short{display:inline}
  .stage{height:clamp(340px,58vh,520px)}
  .controls{flex-direction:column;align-items:stretch;left:10px;right:10px;bottom:10px}
  .ctl-group.presets{align-self:flex-start}
  .ctl-group{align-self:flex-end}
  .foot{flex-direction:column;align-items:flex-start;gap:6px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition-duration:0s!important;transition-delay:0s!important;animation:none!important}
}