/* Help page — builds on the site stylesheet (/styles.css) for tokens, type, header, buttons and footer */

.nav a[aria-current="page"] { opacity: 1; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }

/* ============ Hero + chapter index ============ */
.g-hero { max-width: var(--max); margin: 0 auto; padding: clamp(130px, 14vw, 180px) var(--gutter) 0; }
.g-hero-head { display: grid; grid-template-columns: 7fr 5fr; gap: 0 clamp(32px, 6vw, 96px); align-items: end; }
.g-hero-head .label { grid-column: 1 / -1; }
.g-hero h1 { font-size: clamp(64px, 8.4vw, 132px); line-height: 1.02; letter-spacing: -.01em; }
.g-lead { max-width: 24em; margin-bottom: .8em; font-size: 18px; color: var(--ink-2); }

.chapters { margin-top: clamp(80px, 10vw, 140px); display: grid; grid-template-columns: repeat(3, 1fr); gap: 56px clamp(16px, 2.4vw, 32px); }
.chapters a { display: grid; grid-template-columns: auto 1fr; grid-template-areas: "img img" "num title" ". sub"; column-gap: 14px; }
.c-img { grid-area: img; aspect-ratio: 4 / 3; overflow: hidden; margin-bottom: 20px; }
.c-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 1.2s var(--ease); }
.chapters a:hover .c-img img { transform: scale(1.04); }
.c-sand { background: var(--sand); }
.c-sand img { object-fit: contain; padding: 9% 0; filter: drop-shadow(0 18px 22px rgba(40, 30, 20, .28)); }
.c-shot img { object-fit: cover; object-position: top; padding: 9% 22% 0; filter: drop-shadow(0 10px 20px rgba(40, 30, 20, .2)); }
.chapters .mono { grid-area: num; padding-top: 5px; color: var(--ink-3); }
.chapters strong { grid-area: title; font-size: 20px; font-weight: 500; }
.chapters em { grid-area: sub; font-style: normal; font-size: 15px; color: var(--ink-3); }

/* ============ Chapter scaffolding ============ */
.ch { padding-top: clamp(130px, 15vw, 220px); }
.ch-head { max-width: var(--max); margin: 0 auto clamp(56px, 7vw, 96px); padding: 0 var(--gutter); display: grid; grid-template-columns: 7fr 5fr; gap: 0 clamp(32px, 6vw, 96px); align-items: end; }
.ch-head .label { grid-column: 1 / -1; }
.ch-head h2 { font-size: clamp(52px, 6vw, 96px); line-height: 1.06; }
.ch-intro { max-width: 26em; margin-bottom: .8em; color: var(--ink-2); }
.ch-head h2 em, .faq-head h2 em, .g-hero h1 em { color: var(--ink-3); }

/* ============ 01 · anatomy ============ */
.anatomy-band { background: var(--sand); padding: clamp(100px, 11vw, 150px) var(--gutter) clamp(64px, 7vw, 96px); }
.anatomy { display: flex; flex-wrap: wrap; justify-content: center; align-items: flex-end; gap: 80px clamp(48px, 6vw, 96px); }
.dev { --w: 280px; position: relative; flex: none; width: var(--w); }
.dev-front { margin: 0 210px; }
.dev-back { margin-right: 210px; }
.dev img { width: 100%; filter: drop-shadow(0 30px 34px rgba(40, 30, 20, .32)); }
.dev figcaption { margin-top: 32px; text-align: center; color: var(--ink-3); }

.lbl { position: absolute; top: var(--y); z-index: 1; display: flex; align-items: center; font-size: 14px; line-height: 1.6; color: var(--ink-2); }
.lbl .t { flex: none; width: 196px; }
.lbl b { display: block; margin-bottom: 2px; font-size: 15px; font-weight: 500; color: var(--ink); }
.lbl i { position: relative; flex: none; width: var(--len, 80px); height: 1px; background: var(--ink); }
.lbl i::after { content: ""; position: absolute; top: -3px; width: 7px; height: 7px; border-radius: 50%; background: var(--bg); box-shadow: 0 0 0 1.5px var(--ink); }
.lbl-l { right: calc(100% - var(--x)); transform: translateY(-50%); }
.lbl-l .t { padding-right: 14px; text-align: right; }
.lbl-l i::after { right: -3.5px; }
.lbl-r { left: var(--x); transform: translateY(-50%); }
.lbl-r .t { padding-left: 14px; }
.lbl-r i::after { left: -3.5px; }
.lbl-t { top: auto; bottom: calc(100% - var(--y)); left: var(--x); flex-direction: column; transform: translateX(-50%); }
.lbl-t .t { width: 260px; padding-bottom: 12px; text-align: center; }
.lbl-t i { width: 1px; height: var(--len, 80px); }
.lbl-t i::after { top: auto; bottom: -3.5px; left: -3px; }
.dev-front .lbl-l { --len: 96px; }
.dev-front .lbl-r { --len: 90px; }
.dev-front .lbl-t { --len: 80px; }
.dev-back .lbl-r { --len: 126px; }
.legend { display: none; }

.features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0 clamp(16px, 2.4vw, 32px); margin-top: clamp(80px, 9vw, 130px); }
.features li { padding-top: 20px; border-top: 1px solid var(--ink); }
.features b { display: block; font-size: clamp(56px, 5.6vw, 88px); line-height: 1; letter-spacing: -.02em; }
.features small { margin-left: .06em; font-size: .34em; letter-spacing: 0; }
.features strong { display: block; margin-top: 20px; font-weight: 500; }
.features span { display: block; margin-top: 4px; font-size: 15px; color: var(--ink-2); }

.acc { margin-top: clamp(80px, 9vw, 130px); }
.acc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(16px, 3vw, 40px); }
.acc-art { aspect-ratio: 2 / 1; display: grid; place-items: center; background: var(--paper); }
.acc-art svg { width: 52%; fill: none; stroke: var(--ink); stroke-width: 1.3; stroke-linecap: round; }
.acc figcaption { margin-top: 16px; max-width: 30em; color: var(--ink-2); }
.acc figcaption strong { display: block; margin-bottom: 2px; font-weight: 500; color: var(--ink); }

/* ============ 02 · interactive controls (dark) ============ */
.ch-night { margin-top: clamp(130px, 15vw, 220px); padding-bottom: clamp(110px, 12vw, 170px); background: var(--night); color: var(--on-night); }
.ch-night .label, .ch-night .ch-intro { color: var(--on-night-2); }
.ch-night .ch-head h2 em { color: #d9b98a; }

.demo { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); display: grid; grid-template-columns: 7fr 5fr; gap: clamp(40px, 6vw, 96px); align-items: center; }
.demo-stage { position: relative; padding: 24px 0; }
.demo-stage::before { content: ""; position: absolute; left: 50%; top: 40%; width: 130%; aspect-ratio: 1.4; transform: translate(-50%, -50%); background: radial-gradient(closest-side, rgba(217, 185, 138, .16), transparent); pointer-events: none; }

.d-dev { position: relative; width: min(600px, 100%); margin: 0 auto; aspect-ratio: 5 / 4; border-radius: 13% 13% 0 0 / 16% 16% 0 0; background: linear-gradient(165deg, #34302b, #1a1715 45%, #121110); box-shadow: inset 0 1.5px 0 rgba(255, 255, 255, .16), inset 0 0 0 1px rgba(255, 255, 255, .07); -webkit-mask-image: linear-gradient(#000 52%, transparent 97%); mask-image: linear-gradient(#000 52%, transparent 97%); }
.d-panel { position: absolute; left: 6.5%; right: 6.5%; top: 7%; height: 25%; border-radius: 28px; background: #090807; box-shadow: inset 0 3px 8px rgba(0, 0, 0, .9), 0 1px 0 rgba(255, 255, 255, .07); }
.d-slider { position: absolute; left: 5.5%; top: 13%; bottom: 13%; width: 10.5%; border-radius: 99px; background: #030303; box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .07), inset 0 3px 6px #000; transition: box-shadow .4s; }
.d-slider i { position: absolute; left: 13%; right: 13%; top: 44%; aspect-ratio: 1; border-radius: 50%; background: radial-gradient(circle at 36% 30%, #7b766f, #34312d 55%, #171513); box-shadow: 0 3px 6px rgba(0, 0, 0, .7), inset 0 1px 0 rgba(255, 255, 255, .28); transition: top .6s cubic-bezier(.5, 0, .2, 1); }
.d-dev[data-mode="call"] .d-slider i { top: 6%; }
.d-screen { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); width: 31%; height: 66%; padding: 6% 5% 5%; display: grid; grid-template-rows: auto 1fr auto; border-radius: 6px; background: #000; box-shadow: 0 0 0 1px #211e1b; color: #f2f5ff; font-family: var(--mono); line-height: 1; text-shadow: 0 0 7px rgba(205, 222, 255, .55); }
.d-screen > * { transition: opacity .35s; }
.s-top { display: flex; align-items: center; gap: 6px; font-size: clamp(8px, .75vw, 10px); letter-spacing: .04em; }
.s-rec { font-style: normal; color: #ff5a4e; opacity: 0; }
.s-bat { margin-left: auto; width: 14px; height: 7px; border-radius: 1.5px; box-shadow: inset 0 0 0 1px currentColor; background: linear-gradient(90deg, currentColor 70%, transparent 0) 2px 2px / calc(100% - 4px) 3px no-repeat; }
.s-main { align-self: center; justify-self: center; font-size: clamp(17px, 2.1vw, 27px); letter-spacing: .02em; white-space: nowrap; }
.s-sub { justify-self: center; font-size: clamp(8px, .8vw, 11px); letter-spacing: .06em; white-space: nowrap; }
.d-dev.is-rec .s-rec { opacity: 1; animation: recBlink 1s steps(2) infinite; }
@keyframes recBlink { 50% { opacity: .2; } }
.d-dev.is-off .d-screen > * { opacity: 0; }
.d-btn { position: absolute; right: 5.5%; top: 50%; width: 10.5%; aspect-ratio: 1; transform: translateY(-50%); border-radius: 50%; background: #030303; box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .07), inset 0 3px 6px #000; }
.d-btn i { position: absolute; inset: 12%; border-radius: 50%; background: radial-gradient(circle at 36% 30%, #7b766f, #34312d 55%, #171513); box-shadow: 0 3px 6px rgba(0, 0, 0, .7), inset 0 1px 0 rgba(255, 255, 255, .28); transition: transform .15s, filter .15s; }
.d-dev.is-press .d-btn i { transform: scale(.86); filter: brightness(.75); }
@property --hold { syntax: "<number>"; inherits: false; initial-value: 0; }
.d-btn::before { content: ""; position: absolute; inset: -22%; border-radius: 50%; background: conic-gradient(#d9b98a calc(var(--hold) * 1turn), transparent 0); -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 3px), #000 calc(100% - 2.5px)); mask: radial-gradient(farthest-side, transparent calc(100% - 3px), #000 calc(100% - 2.5px)); opacity: 0; }
.d-dev.is-hold .d-btn::before { opacity: 1; animation: hold 1.2s linear forwards; }
@keyframes hold { to { --hold: 1; } }
.d-btn::after { content: ""; position: absolute; inset: 0; border-radius: 50%; box-shadow: 0 0 0 2px #d9b98a; opacity: 0; }
.d-dev.is-tap .d-btn::after { animation: tap .7s var(--ease); }
@keyframes tap { from { opacity: 1; transform: scale(1); } to { opacity: 0; transform: scale(1.9); } }
.d-dev.is-slide .d-slider { box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .07), inset 0 3px 6px #000, 0 0 0 2px rgba(217, 185, 138, .75); }
.d-ribs { position: absolute; left: 0; right: 0; top: 37%; bottom: 0; background: repeating-linear-gradient(45deg, rgba(255, 255, 255, .075) 0 2px, rgba(255, 255, 255, 0) 12px, rgba(0, 0, 0, .38) 26px, rgba(255, 255, 255, .075) 36px); }
.d-hint { margin-top: 8px; text-align: center; color: #d9b98a; min-height: 1em; }

.demo-list { border-top: 1px solid rgba(239, 231, 218, .16); }
.demo-list button { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 0 16px; width: 100%; padding: 20px 0; border: 0; border-bottom: 1px solid rgba(239, 231, 218, .16); background: none; color: inherit; font: inherit; text-align: left; cursor: pointer; opacity: .5; transition: opacity .3s; }
.demo-list button:hover { opacity: .8; }
.demo-list button[aria-selected="true"] { opacity: 1; }
.demo-list strong { font-size: 20px; font-weight: 500; }
.demo-list .key { grid-column: 2; grid-row: 1; padding: 3px 12px; border-radius: 99px; box-shadow: inset 0 0 0 1px rgba(239, 231, 218, .4); font-family: var(--mono); font-size: 12px; }
.demo-list button[aria-selected="true"] .key { background: #d9b98a; box-shadow: none; color: var(--ink); }
.demo-list .d { grid-column: 1 / -1; max-height: 0; overflow: hidden; color: var(--on-night-2); transition: max-height .5s var(--ease), margin .5s var(--ease); }
.demo-list button[aria-selected="true"] .d { max-height: 120px; margin-top: 8px; }

/* ============ 03 · photo + vertical steps ============ */
.split-steps { display: grid; grid-template-columns: 5fr 7fr; gap: clamp(40px, 6vw, 96px); align-items: start; }
.ss-media { aspect-ratio: 4 / 5; overflow: hidden; }
.ss-media img { width: 100%; height: 100%; object-fit: cover; }
.vsteps li { display: grid; grid-template-columns: 76px 1fr; padding: 28px 0; border-top: 1px solid var(--line); }
.vsteps li:first-child { border-top-color: var(--ink); }
.vsteps .serif { font-size: 40px; line-height: 1; color: var(--ink-3); }
.vsteps strong { font-size: 19px; font-weight: 500; }
.vsteps p { margin-top: 6px; color: var(--ink-2); }
.note { margin-top: 16px; padding: 26px 30px; background: var(--sand); color: var(--ink-2); }
.note .mono { display: block; margin-bottom: 8px; color: var(--ink); }

/* ============ 04 / 05 · horizontal steps ============ */
.hsteps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0 clamp(20px, 3vw, 40px); }
.hsteps .serif { display: block; font-size: clamp(64px, 6vw, 96px); line-height: 1; color: var(--ink); }
.hsteps strong { position: relative; display: block; margin-top: 28px; padding-top: 22px; border-top: 1px solid var(--ink); font-size: 19px; font-weight: 500; }
.hsteps strong::before { content: ""; position: absolute; left: 0; top: -4px; width: 7px; height: 7px; border-radius: 50%; background: var(--ink); }
.hsteps p { margin-top: 8px; color: var(--ink-2); }

.screens-band { margin-top: clamp(80px, 9vw, 130px); padding: clamp(80px, 9vw, 130px) var(--gutter); background: var(--sand); }
.screens { max-width: 1080px; margin: 0 auto; display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(16px, 3vw, 40px); align-items: start; }
.screens figure:nth-child(even) { margin-top: 56px; }
.frame { overflow: hidden; border: 7px solid var(--ink); border-radius: 30px; background: var(--ink); box-shadow: 0 40px 60px -36px rgba(40, 30, 20, .55); }
.frame img { width: 100%; }
.screens figcaption { margin-top: 18px; text-align: center; color: var(--ink-2); }

/* ============ 06 · FAQ ============ */
.faq-wrap { display: grid; grid-template-columns: 5fr 7fr; gap: clamp(40px, 6vw, 96px); align-items: start; }
.faq-head h2 { font-size: clamp(52px, 6vw, 96px); line-height: 1.06; }
.faq { border-top: 1px solid var(--ink); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { position: relative; padding: 26px 48px 26px 0; font-size: 19px; font-weight: 500; list-style: none; cursor: pointer; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before, .faq summary::after { content: ""; position: absolute; right: 6px; top: 50%; width: 16px; height: 1.5px; background: var(--ink); transition: transform .35s var(--ease); }
.faq summary::after { transform: rotate(90deg); }
.faq details[open] summary::after { transform: rotate(0); }
.faq details p { padding: 0 48px 28px 0; color: var(--ink-2); }

/* ============ Closing ============ */
.g-close { position: relative; overflow: hidden; margin-top: clamp(130px, 15vw, 220px); height: min(100svh, 940px); min-height: 620px; text-align: center; }
.g-close-media { position: absolute; inset: 0; }
.g-close-media img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 62%; }
.g-close::after { content: ""; position: absolute; inset: 0 0 45%; background: linear-gradient(180deg, rgba(243, 238, 230, .6), rgba(243, 238, 230, 0)); pointer-events: none; }
.g-close-inner { position: relative; z-index: 1; padding: clamp(100px, 13vh, 150px) var(--gutter) 0; }
.g-close h2 { font-size: clamp(56px, 6.4vw, 104px); line-height: 1.08; }
.g-close p { margin: 20px auto 32px; max-width: 30em; color: var(--ink-2); }

/* ============ Responsive ============ */
@media (max-width: 1080px) {
  .g-hero-head, .ch-head { grid-template-columns: 1fr; }
  .g-lead, .ch-intro { margin-top: 24px; }
  .chapters { grid-template-columns: 1fr 1fr; }
  .demo { grid-template-columns: 1fr; }
  .features { grid-template-columns: 1fr 1fr; gap: 48px 24px; }
  .split-steps { grid-template-columns: 1fr; }
  .ss-media { aspect-ratio: 16 / 10; }
  .hsteps { grid-template-columns: 1fr 1fr; gap: 56px 32px; }
  .screens { grid-template-columns: 1fr 1fr; }
  .faq-wrap { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .g-hero h1 { font-size: 60px; }
  .g-lead { font-size: 16px; }
  .chapters { gap: 36px 14px; }
  .chapters strong { font-size: 16px; }
  .chapters em { font-size: 13px; }
  .chapters .mono { padding-top: 3px; }
  .ch-head h2, .faq-head h2 { font-size: 48px; }

  /* anatomy: numbered pins + legend instead of leader labels */
  .anatomy { flex-wrap: nowrap; gap: 16px; align-items: flex-start; }
  .dev, .dev-front, .dev-back { width: calc(50% - 8px); margin: 0; }
  .lbl, .lbl-l, .lbl-r, .lbl-t { left: var(--x); right: auto; top: var(--y); bottom: auto; transform: none; }
  .lbl .t, .lbl i { display: none; }
  .lbl::before { content: attr(data-n); position: absolute; transform: translate(-50%, -50%); display: grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; background: var(--bg); color: var(--ink); box-shadow: 0 0 0 1px var(--ink), 0 4px 10px rgba(0, 0, 0, .3); font: 500 11px var(--mono); }
  .legend { display: grid; gap: 14px; max-width: 520px; margin: 48px auto 0; font-size: 15px; color: var(--ink-2); }
  .legend b { display: block; font-weight: 500; color: var(--ink); }

  .acc-grid { grid-template-columns: 1fr; }
  .hsteps { grid-template-columns: 1fr; gap: 40px; }
  .hsteps .serif { font-size: 48px; }
  .hsteps strong { margin-top: 16px; padding-top: 16px; }
  .vsteps li { grid-template-columns: 56px 1fr; }
  .vsteps .serif { font-size: 32px; }
  .screens { gap: 16px; }
  .screens figure:nth-child(even) { margin-top: 32px; }
  .frame { border-width: 5px; border-radius: 22px; }

  .g-close { height: auto; min-height: 0; display: flex; flex-direction: column; text-align: left; }
  .g-close::after { display: none; }
  .g-close-media { position: relative; order: 2; aspect-ratio: 4 / 5; }
  .g-close-media img { object-position: 58% 50%; }
  .g-close-inner { padding: 0 var(--gutter) 48px; }
  .g-close h2 { font-size: 52px; }
  .g-close p { margin-left: 0; }
}