:root {
    color-scheme: light;
    --ink: #17384d;
    --ink-soft: #294f60;
    --muted: #60747d;
    --paper: #fffdf8;
    --canvas: #f5f0e6;
    --white: #ffffff;
    --line: #d4dedc;
    --blue: #247faf;
    --blue-dark: #175f86;
    --blue-soft: #e4f1f6;
    --green: #4d8875;
    --green-dark: #356b5d;
    --green-soft: #e2f0e9;
    --olive: #767b4c;
    --olive-soft: #f0efe2;
    --gold: #f2bd5f;
    --focus: #f2aa32;
    --shadow: 0 24px 70px rgba(29, 55, 65, 0.12);
    --shadow-small: 0 12px 34px rgba(29, 55, 65, 0.08);
    --radius-large: 2rem;
    --radius: 1.25rem;
    --page: 74rem;
    --font-ui: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --text-h1: clamp(1.625rem, 1.35rem + 1.2vw, 2.25rem);
    --text-h2: clamp(1.375rem, 1.2rem + 0.75vw, 1.75rem);
    --text-h3: clamp(1.125rem, 1.05rem + 0.35vw, 1.375rem);
}

* { box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    scroll-padding-top: 6rem;
    background: var(--canvas);
}

body {
    min-height: 100vh;
    margin: 0;
    overflow-x: hidden;
    color: var(--ink);
    background:
        radial-gradient(circle at 5% 8%, rgba(76, 139, 149, 0.13), transparent 24rem),
        radial-gradient(circle at 96% 22%, rgba(242, 189, 95, 0.13), transparent 22rem),
        var(--paper);
    font: 400 1rem/1.68 var(--font-ui);
    text-rendering: optimizeLegibility;
}

img {
    display: block;
    max-width: 100%;
    height: auto;
}

a {
    color: var(--blue-dark);
    text-decoration-thickness: 0.08em;
    text-underline-offset: 0.18em;
}

a:hover { text-decoration-thickness: 0.14em; }

a:focus-visible,
.button:focus-visible {
    outline: 3px solid var(--focus);
    outline-offset: 4px;
}

.skip-link {
    position: fixed;
    z-index: 100;
    top: 0.75rem;
    left: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: 0.65rem;
    color: #fff;
    background: var(--ink);
    transform: translateY(-180%);
}

.skip-link:focus { transform: translateY(0); }

.section-shell {
    width: min(calc(100% - 2.5rem), var(--page));
    margin-inline: auto;
}

.site-header {
    position: relative;
    z-index: 30;
    border-bottom: 1px solid rgba(72, 99, 106, 0.14);
    background: rgba(255, 253, 248, 0.9);
    backdrop-filter: blur(14px);
}

.header-inner {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 2rem;
    width: min(calc(100% - 2.5rem), var(--page));
    min-height: 5.25rem;
    margin-inline: auto;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    width: fit-content;
    color: var(--ink);
    text-decoration: none;
}

.brand-wordmark {
    display: block;
    width: clamp(10.5rem, 14vw, 12.75rem);
    height: auto;
}

.brand-mark {
    display: grid;
    flex: 0 0 auto;
    width: 2.85rem;
    height: 2.85rem;
    place-items: center;
    border-radius: 0.9rem 0.9rem 0.9rem 0.25rem;
    color: #fff;
    background: var(--blue-dark);
    font: 700 1.9rem/1 var(--font-ui);
    box-shadow: 0 8px 18px rgba(23, 95, 134, 0.17);
}

.brand-copy {
    display: grid;
    gap: 0.12rem;
}

.brand-copy strong {
    font: 700 1.25rem/1 var(--font-ui);
    letter-spacing: 0.03em;
}

.brand-copy small {
    color: var(--muted);
    font-size: 0.7rem;
    letter-spacing: 0.02em;
}

.main-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(0.8rem, 2vw, 1.75rem);
}

.main-nav a {
    min-height: 2.75rem;
    display: inline-flex;
    align-items: center;
    color: var(--ink-soft);
    font-size: 0.85rem;
    font-weight: 750;
    text-decoration: none;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] { color: var(--blue-dark); }

.header-demo-link {
    min-height: 2.85rem;
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.65rem 1rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--ink);
    background: #fff;
    font-size: 0.82rem;
    font-weight: 800;
    text-decoration: none;
    box-shadow: 0 5px 18px rgba(29, 55, 65, 0.06);
}

.header-demo-link:hover { border-color: var(--blue); }

h1, h2, h3, blockquote {
    overflow-wrap: anywhere;
    margin-top: 0;
    font-family: var(--font-ui);
    font-weight: 700;
    line-height: 1.18;
    letter-spacing: -0.012em;
}

h1 { font-size: var(--text-h1); line-height: 1.15; }
h2 { font-size: var(--text-h2); line-height: 1.2; }
h3 { font-size: var(--text-h3); line-height: 1.25; font-weight: 600; }
p { max-width: 70ch; }

.eyebrow {
    margin: 0 0 0.9rem;
    color: var(--green-dark);
    font-size: 0.75rem;
    font-weight: 850;
    letter-spacing: 0.17em;
    text-transform: uppercase;
}

.lead,
.section-lead {
    color: var(--ink-soft);
    font-size: clamp(1.1rem, 1.8vw, 1.35rem);
    line-height: 1.55;
}

.hero {
    min-height: calc(100svh - 5.25rem);
    display: grid;
    grid-template-columns: minmax(0, 1.06fr) minmax(20rem, 0.94fr);
    grid-template-rows: 1fr auto;
    gap: 2.5rem clamp(2.5rem, 6vw, 6rem);
    align-items: center;
    padding-block: clamp(3.5rem, 7vh, 6rem) 2rem;
}

.hero-copy { min-width: 0; }
.hero h1 {
    max-width: 13ch;
    margin-bottom: 1.35rem;
}
.hero .lead { max-width: 42rem; margin-bottom: 0.9rem; }
.hero-support { max-width: 40rem; color: var(--muted); }

.entry-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    gap: 0.75rem;
    margin-top: 2rem;
}

.button {
    min-height: 3.25rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.78rem 1.25rem;
    border: 2px solid var(--blue);
    border-radius: 0.9rem;
    font-weight: 800;
    line-height: 1.25;
    text-align: center;
    text-decoration: none;
    transition: transform 150ms ease, box-shadow 150ms ease, background 150ms ease;
}

.button:hover {
    transform: translateY(-1px);
    box-shadow: 0 9px 22px rgba(23, 95, 134, 0.13);
}

.button-primary { color: #fff; background: var(--blue); }
.button-primary:hover { background: var(--blue-dark); }
.button-secondary { color: var(--ink); background: #fff; }

.account-link {
    min-height: 3.25rem;
    display: grid;
    align-content: center;
    padding: 0.42rem 0.35rem;
    color: var(--ink-soft);
    text-decoration: none;
}

.account-link span { font-size: 0.9rem; font-weight: 800; }
.account-link small { color: var(--muted); font-size: 0.7rem; }

.hero-visual {
    position: relative;
    min-width: 0;
    margin: 0;
}

.hero-image-frame {
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(43, 75, 85, 0.12);
    border-radius: var(--radius-large);
    background: #f8f6ef;
    box-shadow: var(--shadow);
    transform: rotate(1.4deg);
}

.hero-image-frame::before {
    content: "";
    position: absolute;
    z-index: 1;
    inset: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.72);
    border-radius: calc(var(--radius-large) - 0.7rem);
    pointer-events: none;
}

.hero-image-frame img {
    width: 100%;
    aspect-ratio: 3 / 2;
    object-fit: cover;
}

.hero-visual figcaption {
    position: relative;
    z-index: 2;
    width: fit-content;
    max-width: calc(100% - 2rem);
    margin: -1.5rem auto 0;
    display: flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.75rem 1rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--ink-soft);
    background: rgba(255, 255, 255, 0.95);
    font-size: 0.8rem;
    font-weight: 750;
    box-shadow: var(--shadow-small);
}

.caption-dot {
    width: 0.55rem;
    height: 0.55rem;
    flex: 0 0 auto;
    border-radius: 50%;
    background: var(--green);
}

.principle-strip {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    margin: 0;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 1.1rem;
    background: rgba(255, 255, 255, 0.76);
    list-style: none;
    box-shadow: 0 10px 32px rgba(29, 55, 65, 0.05);
}

.principle-strip li {
    min-width: 0;
    padding: 1rem 1.25rem;
}

.principle-strip li + li { border-left: 1px solid var(--line); }
.principle-strip strong { display: block; color: var(--ink); font-size: 0.88rem; }
.principle-strip span { display: block; color: var(--muted); font-size: 0.78rem; }

.beta-notice {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 1rem 1.4rem;
    margin-block: 1.5rem 0;
    padding: 1.1rem 1.25rem;
    border: 1px solid #bed3c7;
    border-radius: 1rem;
    background: var(--green-soft);
}

.beta-notice h2 {
    margin: 0 0 0.15rem;
    font: 800 0.95rem/1.35 system-ui, sans-serif;
    letter-spacing: 0;
}

.beta-notice p { margin: 0; color: var(--ink-soft); font-size: 0.85rem; }
.beta-notice > a { font-size: 0.82rem; font-weight: 800; white-space: nowrap; }

.status-pill,
.demo-chip {
    display: inline-flex;
    width: fit-content;
    align-items: center;
    justify-content: center;
    padding: 0.38rem 0.65rem;
    border-radius: 999px;
    color: var(--green-dark);
    background: rgba(255, 255, 255, 0.82);
    font-size: 0.64rem;
    font-weight: 900;
    letter-spacing: 0.09em;
    text-transform: uppercase;
}

.status-planned {
    margin-bottom: 1.2rem;
    color: var(--olive);
    background: var(--olive-soft);
}

.section-block {
    padding-block: clamp(5rem, 10vw, 8.5rem);
}

.section-heading {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.65fr);
    gap: 2.5rem;
    align-items: end;
    margin-bottom: 2.5rem;
}

.section-heading h2,
.section-copy h2 { max-width: 17ch; margin-bottom: 0; }
.section-heading > p { margin: 0 0 0.35rem; color: var(--muted); }

.step-list {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
    margin: 0;
    padding: 0;
    counter-reset: viveka-step;
    list-style: none;
}

.step-list li {
    position: relative;
    min-width: 0;
    min-height: 18rem;
    padding: 1.5rem;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: #fff;
    counter-increment: viveka-step;
    box-shadow: var(--shadow-small);
}

.step-list li::after {
    content: counter(viveka-step);
    position: absolute;
    right: -0.15em;
    bottom: -0.28em;
    color: rgba(36, 127, 175, 0.07);
    font: 700 9rem/1 var(--font-ui);
}

.step-number {
    display: grid;
    width: 2.5rem;
    height: 2.5rem;
    margin-bottom: 3rem;
    place-items: center;
    border-radius: 50%;
    color: #fff;
    background: var(--olive);
}

.step-number::before { content: counter(viveka-step, decimal-leading-zero); font-size: 0.72rem; font-weight: 850; }
.step-list h3 { position: relative; z-index: 1; margin-bottom: 0.7rem; }
.step-list p { position: relative; z-index: 1; margin: 0; color: var(--muted); font-size: 0.9rem; }

.paper-first-band {
    padding-block: clamp(5rem, 10vw, 8rem);
    background:
        linear-gradient(90deg, rgba(36, 127, 175, 0.04) 1px, transparent 1px),
        linear-gradient(rgba(36, 127, 175, 0.04) 1px, transparent 1px),
        #f5f8f4;
    background-size: 1.5rem 1.5rem;
    border-block: 1px solid rgba(82, 114, 111, 0.12);
}

.split-layout {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(22rem, 1.1fr);
    gap: clamp(3rem, 8vw, 7rem);
    align-items: center;
}

.section-copy { min-width: 0; }
.section-copy h2 { margin-bottom: 1.25rem; }
.section-copy > p:not(.eyebrow):not(.feature-note) { color: var(--ink-soft); }

.notebook-scene {
    position: relative;
    padding: clamp(1rem, 3vw, 2.25rem);
    border-radius: var(--radius-large);
    background: #dce9e7;
    box-shadow: var(--shadow);
    transform: rotate(-1deg);
}

.notebook-sheet {
    min-height: 24rem;
    padding: 2.7rem clamp(1.5rem, 4vw, 3rem) 2rem clamp(2.8rem, 6vw, 4.8rem);
    border: 1px solid #d6d0c3;
    border-radius: 0.8rem;
    background:
        linear-gradient(90deg, transparent 3.4rem, rgba(224, 105, 97, 0.42) 3.4rem, rgba(224, 105, 97, 0.42) calc(3.4rem + 1px), transparent calc(3.4rem + 1px)),
        linear-gradient(rgba(85, 157, 191, 0.17) 1px, transparent 1px),
        linear-gradient(90deg, rgba(85, 157, 191, 0.14) 1px, transparent 1px),
        #fffdfa;
    background-size: auto, 1.45rem 1.45rem, 1.45rem 1.45rem, auto;
    box-shadow: 0 12px 32px rgba(29, 55, 65, 0.11);
}

.notebook-sheet p { max-width: 31rem; margin: 0 0 1.8rem; font-size: 1.05rem; line-height: 1.55; }
.notebook-sheet strong { display: block; margin-bottom: 1rem; color: #184e7d; font: 700 clamp(1.8rem, 4vw, 3rem)/1.2 var(--font-ui); letter-spacing: 0.01em; }
.notebook-sheet small { color: var(--muted); font-size: 0.82rem; font-weight: 700; }
.notebook-label { color: var(--green-dark); font-size: 0.68rem !important; font-weight: 900; letter-spacing: 0.14em; text-transform: uppercase; }

.paper-clip {
    position: absolute;
    top: 0.45rem;
    right: 3rem;
    width: 1.2rem;
    height: 4rem;
    border: 3px solid #b6a16f;
    border-bottom-color: transparent;
    border-radius: 999px 999px 0 0;
    transform: rotate(7deg);
}

.independence-band {
    padding-block: clamp(5rem, 10vw, 8rem);
    color: #eef7f6;
    background:
        radial-gradient(circle at 85% 15%, rgba(92, 156, 135, 0.28), transparent 24rem),
        linear-gradient(145deg, #15384c, #1e5360 62%, #356b5d);
}

.independence-band .section-shell {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(20rem, 1.05fr);
    gap: clamp(3rem, 8vw, 7rem);
    align-items: start;
}

.independence-band .eyebrow { color: #9ed0bd; }
.independence-band blockquote {
    max-width: 18ch;
    margin: 0 0 2.75rem;
    color: #fff;
    font-size: var(--text-h1);
}
.independence-band h2 { max-width: 17ch; margin-bottom: 1rem; font-size: var(--text-h2); }
.independence-band p { color: #c8dadc; }

.help-levels {
    display: grid;
    gap: 0;
    margin: 0;
    padding: 0;
    list-style: none;
}

.help-levels li {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 1rem;
    padding: 1.6rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.16);
}

.help-levels li:first-child { padding-top: 0; }
.help-levels > li > span {
    display: grid;
    width: 2.7rem;
    height: 2.7rem;
    place-items: center;
    border: 1px solid rgba(255, 255, 255, 0.28);
    border-radius: 50%;
    color: var(--gold);
    font-size: 0.72rem;
    font-weight: 850;
}
.help-levels h3 { margin-bottom: 0.3rem; color: #fff; font-size: 1.25rem; }
.help-levels p { margin: 0; font-size: 0.9rem; }

.work-style {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(22rem, 1.1fr);
    gap: clamp(3rem, 8vw, 7rem);
    align-items: center;
}

.observation-list {
    display: grid;
    gap: 0.8rem;
    margin: 0;
    padding: 1.2rem;
    border: 1px solid var(--line);
    border-radius: var(--radius-large);
    background: #fff;
    list-style: none;
    box-shadow: var(--shadow-small);
}

.observation-list li {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.8rem;
    align-items: center;
    min-height: 3.5rem;
    padding: 0.7rem 0.85rem;
    border-radius: 0.8rem;
    color: var(--ink-soft);
    background: #f7f9f7;
}

.observation-list li span {
    display: grid;
    width: 1.8rem;
    height: 1.8rem;
    place-items: center;
    border-radius: 50%;
    color: #fff;
    background: var(--green);
    font-size: 0.72rem;
}

.parent-band {
    padding-block: clamp(5rem, 10vw, 8rem);
    background: linear-gradient(145deg, #eef4e6, #e1eee8);
    border-block: 1px solid rgba(82, 114, 111, 0.13);
}

.feature-note {
    margin-top: 1.5rem;
    padding-left: 1rem;
    border-left: 3px solid var(--olive);
    color: var(--muted);
    font-size: 0.83rem;
}

.progress-card {
    padding: clamp(1.4rem, 3vw, 2rem);
    border: 1px solid rgba(63, 103, 93, 0.16);
    border-radius: var(--radius-large);
    background: rgba(255, 255, 255, 0.88);
    box-shadow: var(--shadow);
}

.progress-card-head {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--line);
}

.progress-card-head div { display: grid; gap: 0.25rem; }
.progress-card-head div > span { color: var(--muted); font-size: 0.72rem; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; }
.progress-card-head strong { font: 600 1.5rem/1.2 var(--font-ui); }
.demo-chip { align-self: start; color: var(--olive); background: var(--olive-soft); }
.progress-card ul { display: grid; gap: 0.85rem; margin: 1.25rem 0 0; padding: 0; list-style: none; }
.progress-card li { display: grid; grid-template-columns: auto 1fr; gap: 0.8rem; align-items: center; color: var(--ink-soft); font-size: 0.9rem; }
.progress-card li span { width: 0.65rem; height: 0.65rem; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 0.3rem var(--green-soft); }

.school-section {
    display: grid;
    grid-template-columns: minmax(12rem, 0.55fr) minmax(0, 1fr);
    gap: clamp(2rem, 8vw, 7rem);
    align-items: center;
}

.section-index {
    display: grid;
    aspect-ratio: 1;
    place-items: center;
    border-radius: 50% 50% 50% 16%;
    color: #fff;
    background: linear-gradient(145deg, var(--blue), var(--green));
    font: 700 clamp(5rem, 11vw, 9rem)/1 var(--font-ui);
    box-shadow: var(--shadow);
}

.growth-band {
    padding-block: clamp(5rem, 10vw, 8rem);
    background: var(--olive-soft);
    border-block: 1px solid rgba(118, 123, 76, 0.15);
}

.growth-band .section-shell {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(22rem, 1.1fr);
    gap: clamp(3rem, 8vw, 7rem);
    align-items: center;
}

.growth-copy h2 { max-width: 17ch; }
.growth-copy > p:not(.eyebrow):not(.feature-note) { color: var(--ink-soft); }
.subject-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.7rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.subject-list li {
    min-width: 0;
    display: flex;
    justify-content: space-between;
    gap: 0.8rem;
    padding: 1rem;
    border: 1px solid rgba(118, 123, 76, 0.2);
    border-radius: 0.9rem;
    color: var(--ink-soft);
    background: rgba(255, 255, 255, 0.65);
    font-weight: 750;
}

.subject-list li.is-current { color: #fff; background: var(--olive); }
.subject-list small { align-self: center; font-size: 0.62rem; font-weight: 900; letter-spacing: 0.08em; text-transform: uppercase; opacity: 0.72; }

.closing-panel {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 2rem;
    align-items: center;
    margin-block: clamp(4rem, 9vw, 7rem);
    padding: clamp(2rem, 5vw, 4rem);
    border-radius: var(--radius-large);
    color: #fff;
    background:
        radial-gradient(circle at 90% 10%, rgba(92, 156, 135, 0.35), transparent 18rem),
        var(--ink);
    box-shadow: var(--shadow);
}

.closing-panel h2 { max-width: 19ch; margin-bottom: 0.8rem; }
.closing-panel p:not(.eyebrow) { margin-bottom: 0; color: #cadcdf; }
.closing-panel .eyebrow { color: #a8d3c3; }
.closing-actions { display: grid; gap: 0.75rem; justify-items: stretch; min-width: 17rem; }
.closing-panel .text-link,
.about-closing .text-link { color: #dcecef; font-weight: 800; text-align: center; }

.site-footer {
    padding-block: 2.25rem;
    color: #d7e3e5;
    background: #102f42;
}

.footer-inner {
    width: min(calc(100% - 2.5rem), var(--page));
    margin-inline: auto;
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 2rem;
    align-items: center;
}

.brand-footer { color: #fff; }
.brand-footer .brand-mark { background: rgba(255, 255, 255, 0.14); box-shadow: none; }
.brand-footer small { color: #a9bec3; }
.site-footer p { margin: 0; color: #a9bec3; font-size: 0.76rem; text-align: center; }
.site-footer nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 1rem; }
.site-footer nav a { min-height: 2.75rem; display: inline-flex; align-items: center; color: #d7e3e5; font-size: 0.78rem; font-weight: 750; }

/* About page */
.about-hero {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(22rem, 1.05fr);
    gap: clamp(3rem, 8vw, 7rem);
    align-items: center;
    padding-block: clamp(4rem, 9vw, 7rem);
}

.about-hero h1 { margin-bottom: 1.2rem; }
.about-hero-copy > p:last-child { color: var(--muted); }
.about-hero-visual { margin: 0; }
.about-hero-visual img {
    width: 100%;
    aspect-ratio: 3 / 2;
    object-fit: cover;
    border-radius: var(--radius-large);
    box-shadow: var(--shadow);
}
.about-hero-visual figcaption {
    width: min(90%, 30rem);
    margin: -1.5rem auto 0;
    position: relative;
    padding: 1rem 1.2rem;
    border: 1px solid var(--line);
    border-radius: 1rem;
    background: #fff;
    font: 600 1.05rem/1.35 var(--font-ui);
    text-align: center;
    box-shadow: var(--shadow-small);
}

.about-layout {
    display: grid;
    grid-template-columns: 15rem minmax(0, 1fr);
    gap: clamp(3rem, 7vw, 6rem);
    align-items: start;
    padding-block: clamp(5rem, 10vw, 8rem);
}

.about-toc {
    position: sticky;
    top: 2rem;
    padding: 1.25rem;
    border: 1px solid var(--line);
    border-radius: 1rem;
    background: #fff;
    box-shadow: var(--shadow-small);
}

.about-toc > p {
    margin: 0 0 0.75rem;
    color: var(--muted);
    font-size: 0.68rem;
    font-weight: 900;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.about-toc nav { display: grid; }
.about-toc a {
    display: grid;
    grid-template-columns: 1.6rem 1fr;
    gap: 0.55rem;
    padding: 0.65rem 0;
    border-top: 1px solid #eef1ee;
    color: var(--ink-soft);
    font-size: 0.78rem;
    font-weight: 750;
    line-height: 1.35;
    text-decoration: none;
}
.about-toc a span { color: var(--green); font-size: 0.67rem; }

.about-article section {
    scroll-margin-top: 2rem;
    padding-block: 0 4.5rem;
}

.about-article section + section {
    padding-top: 4.5rem;
    border-top: 1px solid var(--line);
}

.about-article section header {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 1.25rem;
    align-items: start;
    margin-bottom: 1.5rem;
}

.article-number {
    display: grid;
    width: 3rem;
    height: 3rem;
    place-items: center;
    border-radius: 50%;
    color: var(--olive);
    background: var(--olive-soft);
    font-size: 0.72rem;
    font-weight: 900;
}

.about-article h2 { max-width: 18ch; margin-bottom: 0; font-size: var(--text-h2); }
.about-article section > p { margin-left: 4.25rem; color: var(--ink-soft); font-size: 1.02rem; }

.about-closing {
    margin-bottom: clamp(4rem, 9vw, 7rem);
    padding: clamp(2.5rem, 6vw, 5rem);
    border-radius: var(--radius-large);
    color: #fff;
    background: linear-gradient(145deg, #17384d, #2f6b66);
    box-shadow: var(--shadow);
}

.about-closing .eyebrow { color: #a8d3c3; }
.about-closing blockquote {
    max-width: 21ch;
    margin: 0 0 1.5rem;
    font-size: var(--text-h1);
}
.about-closing > p:not(.eyebrow) { color: #d1e1e1; }
.about-closing .closing-actions { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-start; margin-top: 2rem; }

@media (max-width: 64rem) {
    .main-nav { display: none; }
    .header-inner { grid-template-columns: 1fr auto; }
    .hero {
        min-height: auto;
        grid-template-columns: 1fr 0.9fr;
        padding-block: 4rem 2rem;
    }
    .step-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .step-list li { min-height: 15rem; }
    .footer-inner { grid-template-columns: 1fr auto; }
    .site-footer p { grid-column: 1 / -1; grid-row: 2; text-align: left; }
}

@media (max-width: 50rem) {
    html { scroll-padding-top: 1rem; }
    .section-shell,
    .header-inner,
    .footer-inner { width: min(calc(100% - 2rem), var(--page)); }

    .hero,
    .about-hero,
    .split-layout,
    .independence-band .section-shell,
    .work-style,
    .school-section,
    .growth-band .section-shell,
    .closing-panel,
    .about-layout {
        grid-template-columns: 1fr;
    }

    .hero { gap: 2.75rem; }
    .hero-copy { max-width: 42rem; }
    .hero-visual { width: min(100%, 36rem); margin-inline: auto; }
    .principle-strip { grid-column: auto; }
    .section-heading { grid-template-columns: 1fr; gap: 0.75rem; }
    .paper-first-band .section-copy,
    .parent-band .section-copy { max-width: 42rem; }
    .notebook-scene,
    .progress-card { width: min(100%, 38rem); margin-inline: auto; }
    .section-index { width: min(52vw, 13rem); justify-self: center; }
    .closing-actions { min-width: 0; width: 100%; }
    .about-toc { position: static; }
    .about-toc nav { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 1rem; }
}

@media (max-width: 36rem) {
    body { font-size: 0.98rem; }
    .header-inner { min-height: 4.7rem; gap: 1rem; }
    .brand-mark { width: 2.55rem; height: 2.55rem; font-size: 1.65rem; }
    .brand-copy strong { font-size: 1.05rem; }
    .brand-copy small { font-size: 0.62rem; }
    .brand-wordmark { width: 8.75rem; }
    .header-demo-link { min-height: 2.75rem; padding-inline: 0.8rem; font-size: 0.72rem; }

    h1 { font-size: var(--text-h1); }
    h2 { font-size: var(--text-h2); }
    .hero { padding-top: 3.2rem; }
    .entry-actions { display: grid; grid-template-columns: 1fr; }
    .button { width: 100%; }
    .account-link { min-height: 3rem; padding-inline: 0.25rem; text-align: center; }

    .principle-strip { grid-template-columns: 1fr; }
    .principle-strip li + li { border-top: 1px solid var(--line); border-left: 0; }
    .beta-notice { grid-template-columns: 1fr; align-items: start; }
    .beta-notice > a { white-space: normal; }
    .step-list { grid-template-columns: 1fr; }
    .step-list li { min-height: 13rem; }
    .step-number { margin-bottom: 2rem; }

    .notebook-scene { padding: 0.75rem; border-radius: 1.4rem; }
    .notebook-sheet {
        min-height: 21rem;
        padding: 2rem 1rem 1.5rem 2.7rem;
        background:
            linear-gradient(90deg, transparent 2.05rem, rgba(224, 105, 97, 0.42) 2.05rem, rgba(224, 105, 97, 0.42) calc(2.05rem + 1px), transparent calc(2.05rem + 1px)),
            linear-gradient(rgba(85, 157, 191, 0.17) 1px, transparent 1px),
            linear-gradient(90deg, rgba(85, 157, 191, 0.14) 1px, transparent 1px),
            #fffdfa;
        background-size: auto, 1.35rem 1.35rem, 1.35rem 1.35rem, auto;
    }
    .notebook-sheet strong { font-size: 1.75rem; }
    .paper-clip { right: 2rem; }

    .subject-list { grid-template-columns: 1fr; }
    .closing-panel { padding: 2rem 1.25rem; border-radius: 1.4rem; }
    .footer-inner { grid-template-columns: 1fr; }
    .site-footer nav { justify-content: flex-start; }
    .site-footer p { grid-column: auto; grid-row: auto; text-align: left; }

    .about-hero { padding-top: 3.2rem; }
    .about-toc nav { grid-template-columns: 1fr; }
    .about-article section header { grid-template-columns: 1fr; gap: 0.7rem; }
    .article-number { width: 2.5rem; height: 2.5rem; }
    .about-article section > p { margin-left: 0; }
    .about-closing { padding: 2rem 1.25rem; border-radius: 1.4rem; }
    .about-closing .closing-actions { display: grid; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }
}