/* Envision C: layers stack-up, capability index, capability bodies, roadmap, principles */

/* 01 layers: a board stack-up, every layer tied to one bus */
.stack { position: relative; margin-top: clamp(32px, 4vw, 52px); padding-right: 22px; border-bottom: 1px solid var(--grid); }
.stack::after { content: ""; position: absolute; right: 0; top: 0; bottom: 0; width: 2px; background: linear-gradient(180deg, #5C9BFF, #2A4C8F); }
.stack li {
  display: grid; grid-template-columns: minmax(0, 1fr); align-items: center; gap: 10px 14px;
  padding: 14px 0; border-top: 1px solid var(--grid);
  font: 400 clamp(21px, 2.3vw, 30px)/1.15 var(--serif); letter-spacing: -0.01em;
}
.stack li::after { content: ""; grid-column: 1; height: 8px; margin-right: -22px; background: var(--b); }
.stack li:nth-child(1) { --b: repeating-linear-gradient(90deg, var(--cu) 0 14px, transparent 0 22px) 0 50% / 100% 4px no-repeat, linear-gradient(var(--cu), var(--cu)) 0 100% / 100% 1px no-repeat; }
.stack li:nth-child(2) { --b: repeating-linear-gradient(180deg, var(--blue) 0 1px, transparent 0 3.5px); }
.stack li:nth-child(3) { --b: repeating-linear-gradient(45deg, var(--rule) 0 1.5px, transparent 0 6px); }
.stack li:nth-child(4) { --b: var(--pcb); }
.stack li:nth-child(5) { --b: radial-gradient(circle, var(--blue) 1.2px, transparent 1.6px) 0 0 / 8px 8px; }
.stack li:nth-child(6) { --b: linear-gradient(var(--ink-2), var(--ink-2)) 0 0 / 100% 1px no-repeat, linear-gradient(var(--ink-2), var(--ink-2)) 0 100% / 100% 1px no-repeat; }
@media (min-width: 760px) {
  .stack li { grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); min-height: 72px; padding: 0; }
  .stack li::after { grid-column: 2; height: 14px; }
}
@media (min-width: 1000px) { .stack, .idx { margin-left: var(--rail); } }

/* 02 capability index */
.idx { counter-reset: i; display: grid; margin-top: clamp(32px, 4vw, 48px); border-top: 1px solid var(--rule); }
.idx li { counter-increment: i; border-bottom: 1px solid var(--grid); }
.idx a { display: flex; align-items: baseline; gap: 14px; min-height: 52px; padding: 13px 0; text-decoration: none; font-size: 17px; font-weight: 500; line-height: 1.3; }
.idx a:hover { color: var(--ink); text-decoration: underline; }
@media (min-width: 760px) {
  .idx { grid-template-columns: repeat(4, minmax(0, 1fr)); border-bottom: 1px solid var(--grid); }
  .idx li { border-bottom: 0; }
  .idx li + li { border-left: 1px solid var(--grid); }
  .idx a { flex-direction: column; gap: 22px; height: 100%; padding: 16px 18px 20px; }
  .idx li:first-child a { padding-left: 0; }
}

/* 2.1 hardware */
.hw img { width: 100%; border: 1px solid var(--grid); background: var(--raised); border-radius: 4px; }
.caps { counter-reset: c; margin-top: 24px; border-top: 1px solid var(--grid); }
.caps li { counter-increment: c; display: flex; align-items: center; gap: 14px; padding: 12px 0; border-bottom: 1px solid var(--grid); font-size: 18px; font-weight: 600; line-height: 1.3; }
.caps li::before {
  content: counter(c); flex: none; display: grid; place-items: center; width: 26px; height: 26px; border-radius: 50%;
  border: 1.5px solid var(--cu); color: var(--cu); font-size: 12px; font-weight: 700;
}
@media (min-width: 640px) { .caps { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 32px; } }

/* 2.2 delivery track: design to store release */
.flow { counter-reset: f; display: grid; }
.flow > li { counter-increment: f; position: relative; padding: 0 0 26px 46px; font-size: 19px; font-weight: 600; line-height: 1.3; min-height: 32px; }
.flow > li::before {
  content: counter(f); position: absolute; left: 0; top: -3px; display: grid; place-items: center; width: 32px; height: 32px; border-radius: 50%;
  background: var(--bg); border: 1.5px solid var(--blue); color: var(--ink); font-size: 13px; font-weight: 700;
}
.flow > li::after { content: ""; position: absolute; left: 15.25px; top: 30px; bottom: 0; width: 1.5px; background: var(--rule); }
.flow > li:last-child { padding-bottom: 0; }
.flow > li:last-child::before { border-color: var(--cu); background: var(--cu); color: var(--bg); }
.flow > li:last-child::after { display: none; }
.stores { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.stores li { padding: 5px 12px; border: 1px solid var(--rule); border-radius: 4px; font-size: 14px; font-weight: 500; color: var(--ink-2); white-space: nowrap; }
@media (min-width: 640px) {
  .flow { grid-template-columns: repeat(4, minmax(0, 1fr)); background: var(--pcb) 0 15px / 100% 2px no-repeat; }
  .flow > li { padding: 48px 16px 0 0; }
  .flow > li::before { top: 0; }
  .flow > li::after { display: none; }
}
.mob { display: grid; gap: 8px 40px; align-items: center; margin-top: 36px; }
.mob img { width: 100%; max-width: 440px; border: 1px solid var(--grid); background: var(--raised); border-radius: 4px; padding: clamp(10px, 2vw, 20px); }
@media (min-width: 760px) { .mob { grid-template-columns: minmax(0, 6fr) minmax(0, 5fr); } .mob .offer { margin-top: 0; } }

/* 2.3 sport: a ruled 2 x 2 sheet, not floating cards */
.apps { display: grid; gap: 1px; background: var(--grid); border: 1px solid var(--grid); }
.apps > div { background: var(--bg); padding: 20px 20px 26px; }
.apps img { width: 100%; margin-bottom: 18px; background: var(--raised); border-radius: 2px; }
.apps p { margin-top: 8px; color: var(--ink-2); font-size: 16px; line-height: 1.55; }
@media (min-width: 640px) { .apps { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* 2.4 applied AI */
.ai { display: grid; gap: 28px 40px; align-items: start; }
.ail { border-top: 1px solid var(--rule); }
.ail li { padding: 14px 0; border-bottom: 1px solid var(--grid); font: 400 clamp(21px, 2vw, 26px)/1.25 var(--serif); }
.ai img { width: 100%; border: 1px solid var(--grid); background: var(--raised); border-radius: 4px; }
.ai .offer { margin-top: 0; }
@media (min-width: 760px) { .ai { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } .ai .offer { grid-column: 1 / -1; } }

/* 03 roadmap */
.cr .st { display: inline-flex; align-items: center; gap: 9px; justify-self: start; margin-top: 4px; padding: 5px 12px; border: 1px solid var(--cu); border-radius: 999px; color: var(--cu); font-size: 14px; font-weight: 600; }
.cr .st::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--cu); }
.plat { display: grid; gap: 32px 40px; align-items: start; }
.lead { font-size: clamp(18px, 1.6vw, 21px); line-height: 1.55; max-width: 44ch; }
.mk { margin-top: 28px; font-size: 15px; color: var(--ink-2); font-weight: 500; }
.meas { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.meas li { display: flex; align-items: center; gap: 10px; padding: 9px 14px; border: 1px solid var(--rule); border-radius: 4px; font-weight: 600; }
.meas li::before { content: ""; width: 18px; height: 2px; background: var(--blue); }
.meas .m2::before { background: var(--cu); }
.meas .m3::before { background: linear-gradient(90deg, var(--blue) 50%, var(--cu) 50%); }
.plates { border: 1px solid var(--grid); background: var(--raised); border-radius: 4px; padding: 16px 16px 12px; }
.plates img { width: 100%; }
.plates figcaption { display: flex; justify-content: space-around; padding-top: 8px; font-size: 14px; color: var(--ink-2); }
.disc { grid-column: 1 / -1; padding: 14px 0 0; border-top: 1px dashed var(--rule); color: var(--ink-2); font-size: 15px; line-height: 1.55; }
@media (min-width: 760px) { .plat { grid-template-columns: minmax(0, 6fr) minmax(0, 5fr); } }

/* 3.2 four sources merge into one bus */
.merge { display: grid; gap: 28px; align-items: center; }
.src { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.src li { padding: 11px 14px; border: 1px solid var(--rule); border-radius: 4px; font-size: 15px; font-weight: 600; line-height: 1.3; }
.merge img { display: none; }
.hub { position: relative; padding: 20px 22px; border: 1px solid var(--b1); border-radius: 4px; background: linear-gradient(180deg, rgba(92, 155, 255, 0.09), rgba(92, 155, 255, 0.02)); }
.hub::before { content: ""; position: absolute; left: 50%; top: -29px; height: 28px; border-left: 1.5px solid var(--blue); }
.hub b { display: block; font: 400 clamp(24px, 2.4vw, 32px)/1.15 var(--serif); }
.hub ul { display: flex; flex-wrap: wrap; gap: 4px 18px; margin-top: 8px; color: var(--ink-2); }
@media (min-width: 760px) {
  .merge { grid-template-columns: minmax(0, 1fr) 200px minmax(0, 1fr); gap: 0; }
  .src { grid-template-columns: 1fr; gap: 0; }
  .src li { height: 56px; display: flex; align-items: center; justify-content: flex-end; padding: 0 14px 0 0; border: 0; text-align: right; font-size: 17px; }
  .merge img { display: block; width: 200px; height: 224px; }
  .hub::before { display: none; }
}

/* 04 principles */
.why { counter-reset: w; display: grid; margin-top: clamp(32px, 4vw, 52px); border-top: 1px solid var(--rule); }
.why li { counter-increment: w; padding: 24px 0 30px; border-bottom: 1px solid var(--grid); }
.why h3 { font-size: clamp(26px, 2.4vw, 32px); }
.why p { margin-top: 10px; color: var(--ink-2); max-width: 34ch; }
@media (min-width: 640px) { .why { grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 32px; } }
@media (min-width: 1000px) {
  .why { grid-template-columns: repeat(4, minmax(0, 1fr)); column-gap: 0; margin-left: var(--rail); }
  .why li { padding-right: 28px; }
  .why li + li { padding-left: 24px; border-left: 1px solid var(--grid); }
}

/* contact form */
.cf { display: grid; gap: 22px 32px; margin-top: clamp(32px, 4vw, 52px); max-width: 860px; }
.fw { grid-column: 1 / -1; }
.fr { display: grid; gap: 8px; }
.fr label { font-size: 14px; font-weight: 600; color: var(--ink-2); }
.fr label span { font-weight: 400; }
.cf input:not([type="checkbox"]), .cf textarea { width: 100%; font: inherit; color: var(--ink); background: var(--raised); border: 1px solid var(--rule); border-radius: 8px; padding: 12px 14px; }
.cf textarea { resize: vertical; min-height: 150px; }
.cf input:focus-visible, .cf textarea:focus-visible { outline: 2px solid var(--blue); outline-offset: 1px; border-color: transparent; }
.ok { display: flex; gap: 12px; align-items: flex-start; font-size: 15px; line-height: 1.5; color: var(--ink-2); }
.ok input { flex: none; width: 18px; height: 18px; margin: 3px 0 0; accent-color: var(--blue); }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.fa { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 24px; }
.cf button { min-height: 46px; padding: 0 30px; font: inherit; font-weight: 600; color: var(--bg); background: var(--ink); border: 0; border-radius: 999px; cursor: pointer; }
.cf button:hover { background: #fff; }
.cf button:disabled { opacity: 0.6; cursor: progress; }
.fs { color: var(--ink-2); }
.fs.err { color: var(--cu); }
@media (min-width: 760px) { .cf { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
@media (min-width: 1000px) { .cf { margin-left: var(--rail); } }