/* How it works: a four-step loop with a progress rail and one product mock per step */

.how { background: linear-gradient(180deg, var(--page) 0%, var(--page-deep) 100%); }

.steps { position: relative; display: grid; gap: clamp(3rem, 7vw, 6rem); }
.steps::before { content: ""; position: absolute; left: 21px; top: 22px; bottom: 22px; width: 2px; background: var(--line); }
.steps::after { content: ""; position: absolute; left: 21px; top: 22px; width: 2px; height: calc((100% - 44px) * var(--progress, 0)); background: linear-gradient(180deg, var(--teal-400), var(--teal-600)); transition: height 300ms linear; }

.step { position: relative; display: grid; grid-template-columns: 44px minmax(0, 1fr) minmax(0, 1.05fr); gap: clamp(1.25rem, 3vw, 3rem); align-items: start; }
.step__node { position: relative; z-index: 1; width: 44px; height: 44px; display: grid; place-items: center; border-radius: 50%; background: var(--surface); border: 2px solid var(--line-strong); font-family: var(--font-display); font-weight: 500; color: var(--text-faint); transition: background var(--t-med), color var(--t-med), border-color var(--t-med), transform var(--t-med) var(--ease-out); }
.step.is-active .step__node { background: var(--ink-900); border-color: var(--ink-900); color: #fff; transform: scale(1.08); }
.step.is-done .step__node { background: var(--teal-500); border-color: var(--teal-500); color: #fff; }

.step__copy { display: grid; gap: 1rem; padding-top: .35rem; max-width: 30rem; }
.step__copy h3 { font-size: clamp(1.7rem, 2.6vw, 2.3rem); letter-spacing: -.025em; }
.step__copy > p { color: var(--text-soft); }
.step__points { display: grid; gap: .55rem; margin-top: .4rem; }
.step__points li { display: flex; gap: .75rem; align-items: baseline; font-size: .98rem; color: var(--ink-800); }
.step__points li::before { content: ""; flex: none; width: 14px; height: 2px; background: var(--teal-500); transform: translateY(-4px); }
.step__mock { position: sticky; top: calc(var(--nav-h) + 24px); }

/* Shared mock chrome */
.mock { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); box-shadow: var(--shadow-md); overflow: hidden; }
.mock__head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1rem 1.25rem; border-bottom: 1px solid var(--line); }
.mock__head > div { display: grid; line-height: 1.25; }
.mock__head strong { font-family: var(--font-display); font-weight: 500; font-size: 1.1rem; }
.mock__eyebrow { font-size: var(--fs-micro); color: var(--text-faint); }

.plan { padding-bottom: 1.25rem; }
.plan__ex { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; padding: 1rem 1.25rem .35rem; }
.plan__ex strong { font-family: var(--font-display); font-weight: 500; }
.plan__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: .6rem; padding: .6rem 1.25rem 0; margin: 0; }
.plan__grid div { background: var(--page); border-radius: var(--r-sm); padding: .7rem .8rem; min-width: 0; }
.plan__grid dt { font-size: var(--fs-micro); color: var(--text-faint); }
.plan__grid dd { margin: 0; font-family: var(--font-display); font-size: 1.3rem; font-weight: 500; color: var(--ink-900); white-space: nowrap; }
.plan__note { margin: 1rem 1.25rem 0; padding: .8rem 1rem; border-radius: var(--r-sm); background: #fff7f4; border: 1px solid rgba(232,105,74,.28); font-size: .92rem; color: var(--ink-900); }
.plan__note-label { display: block; font-size: var(--fs-micro); font-weight: 600; color: var(--alert-ink); margin-bottom: .1rem; }
.plan__btn { margin: 1.1rem 1.25rem 0; pointer-events: none; }

.cam { position: relative; aspect-ratio: 1 / 1.02; background: radial-gradient(120% 90% at 50% 0%, #fff 0%, var(--mint-50) 60%, var(--mint-100) 100%); }
.cam__bar { position: absolute; z-index: 2; top: 0; left: 0; right: 0; display: flex; justify-content: space-between; padding: .85rem 1.1rem; }
.cam canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.cam__brackets { position: absolute; inset: 0; pointer-events: none; }
.cam__brackets i:nth-child(-n+2) { top: 48px; }

.sum { padding-bottom: .5rem; }
.sum__tiles { display: grid; grid-template-columns: repeat(4, 1fr); gap: .6rem; padding: 1rem 1.25rem; }
.sum__tiles div { background: var(--page); border-radius: var(--r-sm); padding: .7rem .8rem; display: grid; gap: .1rem; min-width: 0; }
.sum__tiles span { font-size: var(--fs-micro); color: var(--text-faint); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sum__tiles b { font-family: var(--font-display); font-size: 1.55rem; font-weight: 500; letter-spacing: -.02em; }
.sum__tiles small { font-family: var(--font-body); font-size: .72rem; color: var(--text-faint); margin-left: .15rem; font-weight: 400; }
.sum__errors { padding: .25rem 1.25rem 1.25rem; display: grid; gap: .7rem; }
.sum__errors li, .board__issues li { display: grid; grid-template-columns: 8.5rem 1fr 1.5rem; gap: .8rem; align-items: center; font-size: .9rem; }
.sum__errors i, .board__issues i { display: block; height: 7px; border-radius: 7px; background: var(--page-deep); position: relative; overflow: hidden; }
.sum__errors i::after, .board__issues i::after { content: ""; position: absolute; inset: 0 auto 0 0; width: var(--w); border-radius: 7px; background: linear-gradient(90deg, #f2a58f, var(--alert)); transform-origin: left; transform: scaleX(0); transition: transform 900ms var(--ease-out) 200ms; }
.step__mock.is-in .sum__errors i::after, .board.is-in .board__issues i::after { transform: scaleX(1); }
.sum__errors b, .board__issues b { text-align: right; font-weight: 600; }

.loopback { margin-top: clamp(2.5rem, 5vw, 4rem); margin-left: calc(44px + clamp(1.25rem, 3vw, 3rem)); display: flex; align-items: center; gap: .85rem; color: var(--ink-800); font-family: var(--font-display); font-size: 1.15rem; }
.loopback svg { color: var(--teal-600); flex: none; }

@media (max-width: 900px) {
  .step { grid-template-columns: 36px minmax(0, 1fr); }
  .step__node { width: 36px; height: 36px; font-size: .95rem; }
  .steps::before, .steps::after { left: 17px; }
  .step__mock { position: static; grid-column: 2; }
  .loopback { margin-left: calc(36px + 1.25rem); }
}
@media (max-width: 480px) {
  .sum__tiles { grid-template-columns: repeat(2, 1fr); }
  .plan__grid { grid-template-columns: repeat(2, 1fr); }
  .sum__errors li, .board__issues li { grid-template-columns: 7rem 1fr 1.25rem; }
}