/* PSLE 3D theme — same design language as the Maths portal (Lexend, ink navy, ruled-line blue, highlighter yellow). */
@font-face { font-family: "Lexend"; font-weight: 400; font-display: swap; src: url("../fonts/lexend-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: "Lexend"; font-weight: 500; font-display: swap; src: url("../fonts/lexend-latin-500-normal.woff2") format("woff2"); }
@font-face { font-family: "Lexend"; font-weight: 600; font-display: swap; src: url("../fonts/lexend-latin-600-normal.woff2") format("woff2"); }
@font-face { font-family: "Lexend"; font-weight: 700; font-display: swap; src: url("../fonts/lexend-latin-700-normal.woff2") format("woff2"); }

:root {
  --paper: #F4F6FA; --surface: #FFFFFF; --surface-2: #EEF1F7;
  --ink: #17213A; --ink-2: #4A5572; --ink-3: #6E7A99; --line: #DCE1EC;
  --grid: rgba(39, 71, 168, 0.07);
  --action: #2747A8; --action-ink: #FFFFFF; --action-soft: #E5EBFA;
  --highlight: #F5C400; --good: #0F8A6C; --good-soft: #E1F3EE; --bad: #B42318; --bad-soft: #FDE7E5;
  --font: "Lexend", system-ui, -apple-system, "Segoe UI", sans-serif;
  --wrap: 1180px; --r: 12px; --r-lg: 18px;
  --focus: 0 0 0 3px var(--paper), 0 0 0 5px var(--action);
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--font); color: var(--ink); background: var(--paper); line-height: 1.6; font-feature-settings: "tnum" 1; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -0.015em; margin: 0 0 0.75rem; font-weight: 600; }
h1 { font-size: clamp(2.1rem, 1.4rem + 2.8vw, 3.6rem); letter-spacing: -0.025em; }
h2 { font-size: clamp(1.5rem, 1.2rem + 1.1vw, 2.1rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1rem; }
a { color: var(--action); text-underline-offset: 3px; }
:focus-visible { outline: none; box-shadow: var(--focus); border-radius: 6px; }
.icon { width: 1.4rem; height: 1.4rem; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.lead { font-size: 1.12rem; color: var(--ink-2); max-width: 46ch; }
.muted { color: var(--ink-3); }
.skip-link { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; z-index: 50; }
.skip-link:focus { left: 8px; }
.grid-paper { background-color: var(--surface); background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px); background-size: 24px 24px; }

/* Buttons & inputs */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; min-height: 46px; padding: 0 1.3rem; border-radius: var(--r); border: 1.5px solid var(--action);
  background: var(--action); color: var(--action-ink); font: inherit; font-weight: 600; text-decoration: none; cursor: pointer; }
.btn:hover { filter: brightness(1.08); }
.btn-ghost { background: transparent; color: var(--action); }
.btn-ghost:hover { background: var(--action-soft); filter: none; }
.btn-large { min-height: 54px; padding: 0 1.6rem; font-size: 1.05rem; }
.btn-small { min-height: 38px; padding: 0 1rem; font-size: .92rem; }
.input { font: inherit; width: 100%; min-height: 48px; padding: .6rem .85rem; border: 1.5px solid var(--line); border-radius: var(--r); background: var(--surface); color: var(--ink); }
.input:focus { outline: none; border-color: var(--action); box-shadow: 0 0 0 3px var(--action-soft); }

/* Header */
.site-header { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--paper) 90%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.header-inner { display: flex; align-items: center; gap: 1.5rem; min-height: 68px; }
.brand { display: flex; align-items: center; gap: .6rem; font-weight: 700; font-size: 1.15rem; color: var(--ink); text-decoration: none; white-space: nowrap; }
.brand-mark, .brand-logo { width: 34px; height: 34px; }
.site-nav { margin-left: auto; }
.site-nav .menu { list-style: none; display: flex; gap: .25rem; margin: 0; padding: 0; }
.site-nav a { display: block; padding: .5rem .8rem; border-radius: 8px; color: var(--ink-2); text-decoration: none; font-weight: 500; }
.site-nav a:hover { color: var(--ink); background: var(--surface-2); }

/* Hero */
.hero { border-bottom: 1px solid var(--line); overflow: hidden; }
.hero-inner { display: grid; grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr); gap: 2rem; align-items: center; min-height: min(78vh, 720px); padding-top: 3rem; padding-bottom: 3rem; }
.hero-copy h1 { max-width: 15ch; text-wrap: balance; }
.actions { display: flex; flex-wrap: wrap; gap: .75rem; margin: 1.75rem 0 2rem; }
.status-key { list-style: none; margin: 0; padding: 0; display: grid; gap: .45rem; font-size: .95rem; }
.status-key li { display: flex; align-items: center; gap: .6rem; }
.status-key .dot { width: 12px; height: 12px; border-radius: 3px; background: var(--c); }
.status-key .is-soon .dot { background: transparent; border: 2px dashed var(--c); }
.hero-stage { position: relative; aspect-ratio: 5 / 4; margin-right: max(-120px, calc((1180px - 100vw) / 2)); width: 100%; touch-action: pan-y; }
.hero-stage canvas { position: absolute; inset: 0; width: 100% !important; height: 100% !important; opacity: 0; transition: opacity .6s ease; cursor: grab; }
.hero-stage canvas:active { cursor: grabbing; }
.hero-stage.is-3d canvas { opacity: 1; }
.hero-drawing { position: absolute; inset: 0; width: 100%; height: 100%; transition: opacity .4s ease; }
.hero-stage.is-3d .hero-drawing { opacity: 0; pointer-events: none; }
.hero-drawing .f-top { fill: #6F8BE6; stroke: #fff; stroke-width: 1.2; }
.hero-drawing .f-right { fill: #2747A8; stroke: #fff; stroke-width: 1.2; }
.hero-drawing .f-left { fill: #1C3580; stroke: #fff; stroke-width: 1.2; }
.hero-drawing .dim { font: 600 15px var(--font); fill: var(--ink-2); }
.hero-drawing .wire { fill: none; stroke-width: 2; stroke-dasharray: 6 5; stroke-linejoin: round; }
.hero-drawing .wire-name { font: 600 15px var(--font); }
.hero-drawing .wire-soon { font: 500 12px var(--font); fill: var(--ink-3); }
.hero-drawing .maths-label { font: 600 14px var(--font); fill: var(--ink); }
.scene-labels { position: absolute; inset: 0; pointer-events: none; }
.scene-label { position: absolute; transform: translate(-50%, -100%); white-space: nowrap; font-size: .85rem; font-weight: 600; padding: .3rem .65rem; border-radius: 999px;
  background: var(--surface); border: 1.5px solid var(--c); color: var(--ink); box-shadow: 0 2px 10px rgba(23,33,58,.08); transition: opacity .3s ease; pointer-events: auto; cursor: pointer; }
.scene-label small { font-weight: 500; color: var(--ink-3); margin-left: .35rem; }
.scene-label.is-live { background: var(--c); color: #fff; }
.scene-label.is-live small { color: rgba(255,255,255,.8); }
.scene-label.below { transform: translate(-50%, 10px); }
.scene-label.formula { border-color: transparent; background: var(--ink); color: #fff; cursor: default; font-weight: 500; transform: translate(-50%, 0); }
.scene-hint { position: absolute; right: 8px; bottom: 0; margin: 0; font-size: .8rem; color: var(--ink-3); opacity: 0; transition: opacity .4s; }
.hero-stage.is-3d .scene-hint { opacity: 1; }

/* Sections */
.section { padding: 5rem 0; }
.section-alt { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.subjects { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin-top: 2rem; }
.subject.is-live { grid-column: 1 / -1; display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); column-gap: 3rem; align-items: start; padding: 2rem; }
.subject.is-live .subject-head h3 { font-size: 1.6rem; }
.subject.is-live .ticks { grid-column: 2; grid-row: 1; margin: 2.2rem 0 0; }
.subject.is-live .subject-foot { grid-column: 1; }
.subject { display: flex; flex-direction: column; gap: .5rem; padding: 1.5rem; background: var(--surface); border: 1.5px solid var(--line); border-radius: var(--r-lg); position: relative; }
.subject.is-live { border-color: var(--c); box-shadow: 0 10px 30px -18px var(--c); }
.subject.is-soon { border-style: dashed; border-color: color-mix(in srgb, var(--c) 45%, var(--line)); background: transparent; }
.subject-head { display: flex; align-items: center; gap: .65rem; }
.subject-head h3 { margin: 0; }
.subject-icon { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; color: var(--c); background: color-mix(in srgb, var(--c) 12%, var(--surface)); }
.subject.is-live .subject-icon { background: var(--c); color: #fff; }
.subject-state { align-self: flex-start; display: inline-block; margin-bottom: .75rem; font-size: .78rem; font-weight: 600; padding: .15rem .6rem; border-radius: 999px; background: var(--surface-2); color: var(--ink-2); }
.subject.is-live .subject-state { background: var(--good-soft); color: var(--good); }
.subject p { color: var(--ink-2); margin: .25rem 0 0; }
.subject-foot { margin-top: auto; padding-top: 1rem; display: flex; flex-direction: column; align-items: flex-start; gap: .5rem; }
.subject-note { font-size: .88rem; color: var(--ink-2); font-weight: 500; }
.admin-hint { font-size: .82rem; color: var(--bad); background: var(--bad-soft); padding: .4rem .6rem; border-radius: 8px; }
.ticks { list-style: none; padding: 0; margin: .5rem 0 0; display: grid; gap: .45rem; }
.ticks li { display: flex; gap: .55rem; color: var(--ink-2); }
.ticks li::before { content: ""; flex: none; width: 8px; height: 8px; margin-top: .55em; border-radius: 2px; background: var(--c, var(--action)); }
.chips { list-style: none; padding: 0; margin: .5rem 0 0; display: flex; gap: .4rem; flex-wrap: wrap; }
.chips li { font-size: .85rem; padding: .2rem .65rem; border-radius: 999px; border: 1px dashed var(--c); color: var(--ink-2); }

.steps { list-style: none; counter-reset: step; padding: 0; margin: 2rem 0 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1.5rem; }
.steps li { counter-increment: step; position: relative; padding-top: 3.25rem; }
.steps li::before { content: counter(step); position: absolute; top: 0; left: 0; width: 2.4rem; height: 2.4rem; border-radius: 8px; display: grid; place-items: center;
  font-weight: 600; background: var(--action); color: #fff; }
.steps li:not(:last-child)::after { content: ""; position: absolute; top: 1.2rem; left: 3rem; right: -1rem; border-top: 2px dashed var(--line); }
.steps p { color: var(--ink-2); }
.parents { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: start; }

/* Notify */
.notify { padding: 5rem 0; background: var(--ink); color: #fff; }
.notify .lead { color: rgba(255,255,255,.75); }
.notify-inner { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: 3rem; align-items: start; }
.notify-form { background: var(--surface); color: var(--ink); border-radius: var(--r-lg); padding: 1.75rem; }
.field { margin: 0 0 1rem; border: 0; padding: 0; min-width: 0; }
.field label, .field legend { display: block; font-weight: 500; margin-bottom: .4rem; padding: 0; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.pick { display: flex; flex-wrap: wrap; gap: .5rem; }
.field .pick-item { display: inline-flex; margin: 0; align-items: center; gap: .5rem; padding: .55rem .9rem; border: 1.5px dashed var(--c); border-radius: 999px; cursor: pointer; font-weight: 500; }
.pick-item input { width: 18px; height: 18px; accent-color: var(--c); margin: 0; }
.pick-item:has(input:checked) { background: color-mix(in srgb, var(--c) 12%, var(--surface)); border-style: solid; }
.consent { display: flex; gap: .6rem; align-items: flex-start; font-size: .92rem; color: var(--ink-2); margin: .25rem 0 1.25rem; }
.consent input { width: 20px; height: 20px; margin-top: 2px; flex: none; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.alert { padding: .75rem 1rem; border-radius: var(--r); margin-bottom: 1rem; font-weight: 500; }
.alert-success { background: var(--good-soft); color: #0B5E4A; }
.alert-error { background: var(--bad-soft); color: var(--bad); }

/* Footer & content pages */
.site-footer { padding: 2.5rem 0; border-top: 1px solid var(--line); background: var(--surface); }
.footer-inner { display: grid; grid-template-columns: auto 1fr auto; gap: 1.5rem; align-items: center; }
.footer-brand { display: flex; align-items: center; gap: .5rem; font-weight: 700; }
.footer-text, .footer-copy { margin: 0; font-size: .88rem; color: var(--ink-3); }
.footer-nav ul { list-style: none; display: flex; gap: 1rem; margin: 0; padding: 0; }
.content-wrap { max-width: 760px; padding-top: 3rem; padding-bottom: 4rem; }
.page-title { margin-bottom: 1.5rem; }
.meta { color: var(--ink-3); font-size: .9rem; }
.post-card { padding: 1.25rem 0; border-bottom: 1px solid var(--line); }
.post-card h2 { font-size: 1.35rem; margin: 0 0 .25rem; }
.post-card h2 a { color: var(--ink); text-decoration: none; }
.entry-content { font-size: 1.05rem; }
.entry-content img { max-width: 100%; height: auto; }

/* Responsive */
@media (max-width: 1080px) {
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps li::after { display: none; }
}
@media (max-width: 860px) {
  .subjects { grid-template-columns: 1fr; }
  .subject.is-live { grid-template-columns: 1fr; padding: 1.5rem; }
  .subject.is-live .ticks { grid-column: 1; grid-row: auto; margin-top: .5rem; }
  .hero-stage { margin-right: 0; aspect-ratio: 1 / 1; }
  .hero-inner { grid-template-columns: 1fr; min-height: 0; padding-top: 2rem; gap: 0; }
  .hero-copy h1 { max-width: 16ch; }
  .site-nav { display: none; }
  .header-inner .btn-small { margin-left: auto; }
  .parents, .notify-inner { grid-template-columns: 1fr; gap: 1.5rem; }
  .footer-inner { grid-template-columns: 1fr; }
  .section, .notify { padding: 3.5rem 0; }
}
@media (max-width: 560px) {
  .scene-label { font-size: .74rem; padding: .22rem .55rem; }
  .scene-label.formula { left: 50% !important; top: 4px !important; transform: translate(-50%, 0); }
  .subjects, .steps, .row { grid-template-columns: 1fr; }
  .wrap { padding: 0 16px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}