/* ===================================================================
   NITARTI · how it works — vertical timeline (LIGHT theme)
   Redesigned to blend with the site: light surfaces, teal accents,
   site typography. Scoped to .how-timeline.
   =================================================================== */
.how-timeline {
  --brand-deep:   #008a44;
  --brand-mint:   #00ab55;
  --line-soft:    var(--line);
  --line-hi:      var(--line-strong);
  --text-mute:    var(--ink-500);
  --text-dim:     var(--ink-400);
  --font-display: var(--font-sans);
  --maxw:         1180px;
  --radius-lg:    var(--r-lg);
  --ease:         cubic-bezier(.2,.7,.2,1);
  --ease-out:     cubic-bezier(.2,.8,.2,1);
  position: relative;
  color: var(--ink-700);
}

.how-timeline .htl-head { max-width: 760px; text-align: center; margin: 0 auto; }
.how-timeline .htl-eyebrow { display:inline-block; font-size: 13px; font-weight: 700; letter-spacing: .04em; color: var(--teal-600); }
.how-timeline .htl-title { color: var(--ink-900); font-size: clamp(28px, 4vw, 42px); font-weight: 800; line-height: 1.12; margin: 8px 0 0; }
.how-timeline .htl-title em { color: var(--teal-600); font-style: normal; }

.timeline { position: relative; max-width: var(--maxw); margin: 0 auto; padding: 54px var(--gutter) 0; }

.timeline__line { position: absolute; top: 54px; bottom: 24px; left: 50%; width: 2px; background: var(--line-hi); transform: translateX(-50%); border-radius: 999px; overflow: hidden; pointer-events: none; }
.timeline__line-fill { position: absolute; inset: 0 0 auto 0; height: 0%; background: linear-gradient(180deg, var(--brand-deep), var(--brand-mint)); will-change: height; }

.timeline-step { position: relative; display: grid; grid-template-columns: 1fr 90px 1fr; align-items: center; gap: 30px; margin-bottom: 96px; }
.timeline-step:last-child { margin-bottom: 24px; }
.timeline-step__copy { display: flex; flex-direction: column; gap: 12px; grid-column: 1; grid-row: 1; text-align: end; padding-inline-end: 26px; }
.timeline-step__demo { grid-column: 3; grid-row: 1; padding-inline-start: 26px; }
.timeline-step__node { grid-column: 2; grid-row: 1; display: flex; align-items: center; justify-content: center; }
.timeline-step[data-side="right"] .timeline-step__copy { grid-column: 3; text-align: start; padding-inline-end: 0; padding-inline-start: 26px; align-items: flex-start; }
.timeline-step[data-side="right"] .timeline-step__demo { grid-column: 1; padding-inline-start: 0; padding-inline-end: 26px; }
.timeline-step[data-side="left"] .timeline-step__copy { margin-inline-start: auto; align-items: flex-end; }

.timeline-step__copy h3 { color: var(--ink-900); font-size: clamp(22px, 2.6vw, 30px); font-weight: 800; line-height: 1.15; margin: 0; }
.timeline-step__copy p { color: var(--ink-500); line-height: 1.7; max-width: 42ch; font-size: 15.5px; margin: 0; }
.timeline-step__num { font-family: var(--font-mono); font-size: 13px; font-weight: 600; letter-spacing: .12em; color: var(--teal-600); }

.timeline-step__node-dot { position: relative; width: 18px; height: 18px; background: var(--white); border: 2px solid var(--line-hi); border-radius: 50%; z-index: 1; transition: border-color .5s var(--ease), background .5s var(--ease), transform .5s var(--ease), box-shadow .5s var(--ease); }
.timeline-step.is-lit .timeline-step__node-dot { border-color: var(--brand-mint); background: var(--brand-mint); transform: scale(1.2); box-shadow: 0 0 0 5px rgba(0,171,85,.16); }

.timeline-step__copy, .timeline-step__demo { opacity: 0; transform: translateY(24px); transition: opacity .7s var(--ease-out), transform .7s var(--ease-out); }
.timeline-step.is-active .timeline-step__copy { opacity: 1; transform: none; transition-delay: .05s; }
.timeline-step.is-active .timeline-step__demo { opacity: 1; transform: none; transition-delay: .16s; }

.demo { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 24px; position: relative; overflow: hidden; height: 220px; display: flex; box-shadow: var(--shadow-sm); }
.demo::before { content: ""; position: absolute; inset: 0; background: radial-gradient(70% 80% at 100% 100%, rgba(0,171,85,.06), transparent 60%); pointer-events: none; }

.demo--connect { align-items: center; justify-content: space-between; gap: 14px; color: var(--teal-600); }
.demo-connect__device, .demo-connect__cloud { display: flex; flex-direction: column; align-items: center; gap: 8px; flex-shrink: 0; font-family: var(--font-mono); font-size: 10px; letter-spacing: .12em; color: var(--ink-400); z-index: 1; }
.demo-connect__device::before { content: ""; width: 54px; height: 54px; border: 1.5px solid var(--teal-500); border-radius: 10px; background: var(--teal-50); position: relative; }
.demo-connect__device-dot { position: absolute; width: 8px; height: 8px; margin-top: 23px; background: var(--brand-mint); border-radius: 50%; animation: connectPulse 1.6s ease-in-out infinite; }
@keyframes connectPulse { 0%,100%{ opacity:1; transform:scale(1);} 50%{ opacity:.4; transform:scale(.7);} }
.demo-connect__cloud svg { width: 54px; height: 36px; color: var(--teal-500); }
.demo-connect__arc { flex: 1; height: 80px; color: var(--teal-500); z-index: 1; }

.demo--monitor { flex-direction: column; gap: 12px; color: var(--teal-600); justify-content: space-between; }
.demo-monitor__readout { display: flex; align-items: baseline; justify-content: space-between; font-family: var(--font-mono); z-index: 1; }
.demo-monitor__label { font-size: 11px; letter-spacing: .12em; color: var(--ink-400); }
.demo-monitor__value { font-size: clamp(24px, 3vw, 30px); font-weight: 800; color: var(--teal-600); }
.demo-monitor__spark { width: 100%; height: 84px; z-index: 1; }

.demo--visualize { display: grid; grid-template-columns: 1.4fr 1fr; grid-template-rows: 1fr 1fr; gap: 10px; color: var(--teal-600); }
.demo-vis__tile { background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 12px; position: relative; z-index: 1; opacity: 0; transform: translateY(10px) scale(.96); transition: opacity .6s var(--ease-out), transform .6s var(--ease-out); }
.timeline-step.is-active .demo-vis__tile { opacity: 1; transform: none; }
.timeline-step.is-active .demo-vis__tile:nth-child(1){ transition-delay:.28s } .timeline-step.is-active .demo-vis__tile:nth-child(2){ transition-delay:.4s } .timeline-step.is-active .demo-vis__tile:nth-child(3){ transition-delay:.52s }
.demo-vis__tile--chart { grid-column: 1/2; grid-row: 1/3; display: flex; align-items: center; }
.demo-vis__tile--chart svg { width: 100%; height: 100%; max-height: 116px; }
.demo-vis__tile--ring { display: flex; align-items: center; justify-content: center; }
.demo-vis__tile--ring svg { width: 54px; height: 54px; color: var(--teal-500); }
.demo-vis__tile--bars { display: flex; align-items: flex-end; gap: 5px; padding: 14px 12px 12px; height: 100%; }
.demo-vis__bar { flex: 1; height: var(--h, 50%); background: linear-gradient(to top, var(--brand-deep), var(--brand-mint)); border-radius: 2px 2px 0 0; transform-origin: bottom; transform: scaleY(0); transition: transform .6s var(--ease-out); }
.timeline-step.is-active .demo-vis__bar { transform: scaleY(1); }
.timeline-step.is-active .demo-vis__bar:nth-child(1){ transition-delay:.62s } .timeline-step.is-active .demo-vis__bar:nth-child(2){ transition-delay:.69s } .timeline-step.is-active .demo-vis__bar:nth-child(3){ transition-delay:.76s } .timeline-step.is-active .demo-vis__bar:nth-child(4){ transition-delay:.83s } .timeline-step.is-active .demo-vis__bar:nth-child(5){ transition-delay:.9s }

.demo--control { flex-direction: column; align-items: center; justify-content: center; gap: 14px; color: var(--teal-600); }
.demo-control__lock { width: 70px; height: 88px; transition: color .5s var(--ease); z-index: 1; }
.demo-control__shackle { transform-box: fill-box; transform-origin: 100% 100%; transition: transform .55s cubic-bezier(.4,0,.2,1); }
.timeline-step.is-unlocked .demo-control__shackle { transform: rotate(28deg); }
.demo-control__status { display: flex; align-items: center; gap: 9px; font-family: var(--font-mono); font-size: 12px; letter-spacing: .1em; color: currentColor; z-index: 1; }
.demo-control__pulse { width: 7px; height: 7px; background: currentColor; border-radius: 50%; animation: connectPulse 1.4s ease-in-out infinite; }
.timeline-step.is-unlocked .demo-control__lock, .timeline-step.is-unlocked .demo-control__status { color: #b45309; }

@media (max-width: 900px) {
  .timeline { padding: 36px var(--gutter) 0; }
  .timeline__line { display: none; }
  .timeline-step__node { display: none; }
  .timeline-step { grid-template-columns: 1fr; grid-template-rows: auto auto; gap: 14px 0; margin-bottom: 54px; }
  .timeline-step__copy,
  .timeline-step[data-side="right"] .timeline-step__copy,
  .timeline-step[data-side="left"] .timeline-step__copy { grid-column: 1; grid-row: 1; text-align: right; padding: 0; margin-inline-start: 0; margin-inline-end: 0; align-items: flex-start; }
  .timeline-step__demo, .timeline-step[data-side="right"] .timeline-step__demo { grid-column: 1; grid-row: 2; padding: 0; min-width: 0; }
  .demo, .demo--connect { min-width: 0; }
  .demo--connect { gap: 8px; }
  .demo-connect__device, .demo-connect__cloud { flex-shrink: 0; }
  .demo-connect__connector, .demo--connect > svg { min-width: 0; max-width: 100%; flex: 1 1 auto; }
  .timeline-step__copy p { text-align: right; }
  .demo { height: 176px; padding: 16px; }
  .demo-monitor__spark { height: 64px; }
  .demo-control__lock { width: 56px; height: 70px; }
}

@media (prefers-reduced-motion: reduce) {
  .timeline-step__copy, .timeline-step__demo, .timeline-step__node-dot, .demo-vis__tile, .demo-vis__bar, .demo-control__shackle, .timeline__line-fill { transition: none !important; }
  .demo-connect__device-dot, .demo-control__pulse { animation: none !important; }
  .timeline-step__copy, .timeline-step__demo, .demo-vis__tile, .demo-vis__bar { opacity: 1 !important; transform: none !important; }
}