/* ============================================================
   Sections — monochrome, premium. Hero (opening MacBook), problem,
   pinned demo, grid, principles, install, hood, footer, responsive.
   ============================================================ */

/* ---- Hero (the laptop is the whole first glance) ---- */
.hero { min-height: calc(100svh - var(--menubar-h)); display: flex; align-items: center; justify-content: center; padding-block: 2rem; }
.hero-fade { opacity: 0; animation: fade-in 1s var(--ease) forwards; animation-delay: 0.25s; }
.hero-laptop { width: 100%; }

/* ---- Problem ---- */
.problem .grid-2 { display: grid; grid-template-columns: 1fr; gap: 2.5rem; align-items: center; }
@media (min-width: 860px) { .problem .grid-2 { grid-template-columns: 1fr 1fr; } }
.problem h2 { font-size: var(--fs-h2); max-width: 16ch; }
.problem .lead { max-width: 46ch; }
.tab-flicker { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; max-width: 460px; }
.win { border-radius: 10px; border: 1px solid var(--hairline); background: var(--surface); overflow: hidden; transition: border-color 0.4s, background 0.4s, transform 0.4s var(--spring); }
.win.flash { border-color: var(--hairline-2); background: var(--surface-2); transform: translateY(-2px); }
.win-bar { display: flex; align-items: center; gap: 4px; padding: 5px 8px; background: rgba(255,255,255,0.04); border-bottom: 1px solid var(--hairline); }
.win-bar i { width: 6px; height: 6px; border-radius: 50%; background: #3a3a3f; }
.win-bar i:nth-child(1) { background: #ff5f57; } .win-bar i:nth-child(2) { background: #febc2e; } .win-bar i:nth-child(3) { background: #28c840; }
.win-bar span { margin-left: 5px; font-size: 9px; color: var(--ink-faint); font-family: var(--mono); }
.win-body { padding: 9px; display: flex; flex-direction: column; gap: 6px; min-height: 52px; }
.wrow { display: flex; align-items: center; gap: 6px; font-size: 10.5px; }
.wd { width: 6px; height: 6px; border-radius: 50%; background: var(--neutral); flex-shrink: 0; }
.wd.good { background: var(--good); } .wd.warning { background: var(--warning); } .wd.info { background: var(--info); }
.wl { color: var(--ink-dim); flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.wg { color: var(--ink-faint); font-family: var(--mono); font-size: 9px; }
.wbar { height: 4px; border-radius: 2px; background: rgba(255,255,255,0.12); overflow: hidden; }
.wbar b { display: block; height: 100%; background: #fff; border-radius: 2px; }
.win-body.mono .wt { font-family: var(--mono); font-size: 9.5px; color: var(--ink-dim); }
.win-body.mono .wt.d { color: var(--ink-faint); }

/* ---- Section header ---- */
.sec-head { max-width: 52ch; margin-bottom: 3rem; }
.sec-head.center { text-align: center; margin-inline: auto; }
.sec-head .eyebrow { display: inline-block; margin-bottom: 1rem; }
.sec-head h2 { font-size: var(--fs-h2); }
.sec-head p { margin-top: 1.1rem; color: var(--ink-dim); font-size: var(--fs-lead); }

/* ---- Pinned notch demo ---- */
.demo-track { position: relative; height: 240vh; }
.demo-pin { position: sticky; top: var(--menubar-h); height: calc(100svh - var(--menubar-h)); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2rem; }
.demo-caption { text-align: center; max-width: 34ch; min-height: 4.2em; }
.demo-caption h3 { font-size: clamp(1.5rem, 3.2vw, 2.4rem); transition: opacity 0.35s var(--ease), transform 0.4s var(--spring); }
.demo-caption p { color: var(--ink-dim); margin-top: 0.5rem; transition: opacity 0.35s var(--ease), transform 0.4s var(--spring); }
.demo-scale { position: relative; transition: transform 0.15s linear; }
.demo-scale .device { width: min(720px, 94vw); }
.demo-glow { position: absolute; inset: -14% -10%; z-index: -1; background: radial-gradient(50% 60% at 50% 45%, rgba(255,255,255,0.08), transparent 70%); filter: blur(8px); }
.demo-scale .panel { transition: opacity 0.3s var(--ease); }
.demo-progress { display: flex; gap: 8px; }
.demo-progress i { width: 40px; height: 3px; border-radius: 2px; background: rgba(255,255,255,0.14); transition: background 0.4s; }
.demo-progress i.on { background: #fff; }

/* ---- Module grid ---- */
.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); }
.grid-label { grid-column: 1 / -1; margin-top: 1.6rem; font-family: var(--mono); font-size: 0.76rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-faint); }
.grid-label:first-child { margin-top: 0; }

/* ---- Principles ---- */
.principles { display: grid; gap: 1rem; grid-template-columns: 1fr; }
@media (min-width: 840px) { .principles { grid-template-columns: repeat(3, 1fr); } }
.principle { padding: 2rem 1.7rem; border-radius: var(--radius-lg); border: 1px solid var(--hairline); background: var(--surface); display: flex; flex-direction: column; gap: 0.7rem; min-height: 280px; transition: border-color 0.4s, background 0.4s; }
.principle:hover { border-color: var(--hairline-2); background: var(--surface-2); }
.principle .num { font-family: var(--mono); font-size: 2.2rem; color: var(--ink-faint); line-height: 1; }
.principle h3 { font-size: 1.45rem; }
.principle p { color: var(--ink-dim); font-size: 0.94rem; }
.principle .demo-slot { margin-top: auto; }
.stale-pill { display: inline-flex; align-items: center; gap: 8px; padding: 6px 12px; border-radius: 999px; border: 1px dashed var(--hairline-2); font-size: 12.5px; color: var(--ink-faint); opacity: 0.7; }
.stale-pill .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ink-faint); }
.stale-pill .ts { font-family: var(--mono); font-size: 10.5px; }
.lock-row { display: flex; align-items: center; gap: 10px; font-family: var(--mono); font-size: 0.82rem; color: var(--ink-dim); }
.lock-row .k { color: var(--ink); }

/* ---- Install ---- */
.install .note { margin: 1.6rem auto 0; max-width: 56ch; color: var(--ink-dim); font-size: 0.95rem; text-align: center; }
.install .note code { color: var(--ink); }
.install .badges { display: flex; gap: 0.6rem; justify-content: center; flex-wrap: wrap; margin-top: 1.6rem; }
.badge { font-family: var(--mono); font-size: 0.78rem; color: var(--ink-dim); border: 1px solid var(--hairline); padding: 5px 12px; border-radius: 999px; }

/* ---- Under the hood ---- */
.hood { border-block: 1px solid var(--hairline); background: rgba(255,255,255,0.012); }
.hood-grid { display: grid; gap: 1.6rem 2.4rem; grid-template-columns: 1fr; }
@media (min-width: 760px) { .hood-grid { grid-template-columns: repeat(2, 1fr); } }
.hood-item { display: flex; gap: 1rem; }
.hood-item .n { font-family: var(--mono); color: var(--ink-faint); font-size: 0.85rem; padding-top: 0.2rem; }
.hood-item h4 { font-size: 1.08rem; margin-bottom: 0.3rem; }
.hood-item p { color: var(--ink-dim); font-size: 0.9rem; }
.stat-row { display: flex; gap: 3rem; flex-wrap: wrap; margin-top: 2.6rem; padding-top: 2.4rem; border-top: 1px solid var(--hairline); }
.stat .big { font-family: var(--display); font-size: clamp(2.2rem, 5vw, 3.4rem); font-weight: 700; letter-spacing: -0.04em; }
.stat .lbl { font-family: var(--mono); font-size: 0.8rem; color: var(--ink-faint); }

/* ---- Footer ---- */
.footer { padding-block: 4.5rem 3rem; border-top: 1px solid var(--hairline); }
.footer .f-top { display: flex; justify-content: space-between; align-items: flex-end; gap: 2rem; flex-wrap: wrap; }
.footer .f-mark { font-family: var(--display); font-weight: 700; font-size: clamp(2.5rem, 8vw, 5rem); letter-spacing: -0.04em; line-height: 0.9; }
.footer .f-tag { color: var(--ink-dim); margin-top: 0.6rem; }
.footer .f-links { display: flex; gap: 1.4rem; flex-wrap: wrap; }
.footer .f-links a { font-family: var(--mono); font-size: 0.86rem; color: var(--ink-dim); transition: color 0.2s; }
.footer .f-links a:hover { color: #fff; }
.footer .f-fine { margin-top: 2.5rem; font-family: var(--mono); font-size: 0.78rem; color: var(--ink-faint); }

/* ---- Responsive ---- */
@media (max-width: 780px) {
  .mb-menu { display: none; }
  .mb-toggle { display: inline-flex; }
  .mb-menu.open { display: flex; position: fixed; inset: var(--menubar-h) 0 auto 0; flex-direction: column; gap: 0.3rem; padding: 1rem; background: rgba(0,0,0,0.97); backdrop-filter: blur(20px); border-bottom: 1px solid var(--hairline); }
  .mb-notch-wrap, .mb-clock { display: none; }
}
@media (max-width: 620px) {
  .pill { font-size: 11px; height: 22px; padding: 0 8px; }
  .pill.left { right: calc(50% + 75px + 5px); } .pill.right { left: calc(50% + 75px + 5px); }
  .demo-scale { transform: none; }
}