:root {
    --colour-navy: #102a43;
    --colour-blue: #1d4f7a;
    --colour-blue-light: #e9f0f6;
    --colour-text: #243746;
    --colour-muted: #647482;
    --colour-border: #d9e1e7;
    --colour-background: #f7f9fb;
    --colour-white: #ffffff;
    --colour-paper: #faf9f5;

    --page-width: 1180px;
    --header-height: 84px;

    --font-primary:
        Inter,
        "Segoe UI",
        Arial,
        sans-serif;

    --font-display:
        Georgia,
        "Times New Roman",
        serif;
}

/* Reset */

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--colour-paper);
    color: var(--colour-text);
    font-family: var(--font-primary);
    line-height: 1.6;
}

h1,
h2,
h3,
p,
ul {
    margin: 0;
}

a {
    color: inherit;
    text-decoration: none;
}

:focus-visible {
    outline: 2px solid var(--colour-blue);
    outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

.container {
    width: min(calc(100% - 48px), var(--page-width));
    margin-inline: auto;
}

/* Navigation */

.site-header {
    min-height: var(--header-height);
    border-bottom: 1px solid var(--colour-border);
    background: rgba(255, 255, 255, 0.97);
}

.navigation {
    min-height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--colour-navy);
    font-size: 1.35rem;
    font-weight: 750;
    letter-spacing: 0.16em;
}

.brand svg {
    width: 28px;
    height: 28px;
    flex: 0 0 auto;
}

.primary-navigation {
    display: flex;
    align-items: center;
    gap: 32px;
}

.primary-navigation a {
    color: var(--colour-text);
    font-size: 0.92rem;
    font-weight: 600;
    transition:
        color 160ms ease,
        border-color 160ms ease,
        background-color 160ms ease;
}

.primary-navigation a:hover,
.primary-navigation a:focus-visible {
    color: var(--colour-blue);
}

.primary-navigation a.is-active {
    color: var(--colour-blue);
}

.primary-navigation .navigation-cta {
    padding: 10px 18px;
    border: 1px solid var(--colour-blue);
    color: var(--colour-blue);
}

.primary-navigation .navigation-cta:hover,
.primary-navigation .navigation-cta:focus-visible {
    background: var(--colour-blue);
    color: var(--colour-white);
}

/* Hero (homepage) */

.hero {
    min-height: calc(100vh - var(--header-height));
    display: flex;
    align-items: center;
    padding: 96px 0;
    background:
        linear-gradient(
            90deg,
            var(--colour-white) 0%,
            var(--colour-white) 60%,
            var(--colour-background) 60%,
            var(--colour-background) 100%
        );
}

.hero-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
    align-items: center;
    gap: clamp(64px, 9vw, 130px);
}

.hero-content {
    max-width: 760px;
}

.eyebrow,
.kicker {
    display: block;
    margin: 0 0 22px;
    color: var(--colour-blue);
    font-size: 0.78rem;
    font-weight: 750;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

h1 {
    max-width: 760px;
    color: var(--colour-navy);
    font-size: clamp(2.75rem, 5vw, 5.25rem);
    font-weight: 650;
    letter-spacing: -0.045em;
    line-height: 1.02;
}

.hero-introduction {
    max-width: 690px;
    margin: 32px 0 0;
    color: var(--colour-muted);
    font-size: clamp(1.05rem, 1.5vw, 1.25rem);
    line-height: 1.75;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 42px;
}

.button {
    display: inline-flex;
    min-height: 50px;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border: 1px solid transparent;
    font-size: 0.94rem;
    font-weight: 700;
    transition:
        background-color 160ms ease,
        color 160ms ease,
        border-color 160ms ease;
}

.button-primary {
    background: var(--colour-blue);
    color: var(--colour-white);
}

.button-primary:hover,
.button-primary:focus-visible {
    background: var(--colour-navy);
}

.button-secondary {
    border-color: var(--colour-border);
    background: var(--colour-white);
    color: var(--colour-navy);
}

.button-secondary:hover,
.button-secondary:focus-visible {
    border-color: var(--colour-blue);
    color: var(--colour-blue);
}

/* Institutional progression (homepage hero) */

.hero-architecture {
    width: 100%;
    max-width: 390px;
    padding: 48px 40px;
    border-left: 1px solid var(--colour-border);
}

.architecture-stage {
    display: grid;
    grid-template-columns: 42px 1fr;
    align-items: baseline;
    gap: 18px;
}

.architecture-number {
    color: var(--colour-blue);
    font-size: 0.72rem;
    font-weight: 750;
    letter-spacing: 0.12em;
}

.architecture-label {
    color: var(--colour-navy);
    font-size: clamp(1.2rem, 2vw, 1.6rem);
    font-weight: 620;
    letter-spacing: -0.02em;
    line-height: 1.25;
}

.architecture-line {
    display: block;
    width: 1px;
    height: 46px;
    margin: 10px 0 10px 20px;
    background: var(--colour-border);
}

.architecture-stage-final .architecture-label {
    color: var(--colour-blue);
}

/* Interior page hero */

.page-hero {
    padding: 96px 0 72px;
    border-bottom: 1px solid var(--colour-border);
}

.page-hero h1 {
    max-width: 900px;
    font-family: var(--font-display);
    font-size: clamp(2.7rem, 4.6vw, 4.3rem);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 1.02;
}

.page-hero .hero-introduction {
    margin: 28px 0 0;
    max-width: 760px;
    font-size: clamp(1.08rem, 1.5vw, 1.28rem);
    line-height: 1.72;
}

/* Generic section */

.section {
    padding: 88px 0;
    border-bottom: 1px solid var(--colour-border);
}

.section:last-of-type {
    border-bottom: none;
}

.section-title {
    max-width: 700px;
    color: var(--colour-navy);
    font-size: clamp(1.5rem, 2.4vw, 2rem);
    font-weight: 650;
    letter-spacing: -0.02em;
    line-height: 1.25;
}

.section-introduction {
    max-width: 680px;
    margin-top: 16px;
    color: var(--colour-muted);
    font-size: 1.02rem;
    line-height: 1.75;
}

.two-column {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}

.two-column .section-introduction {
    margin-top: 0;
}

/* Principles */

.principle-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border: 1px solid var(--colour-border);
    margin-top: 28px;
}

.principle {
    display: flex;
    gap: 14px;
    padding: 22px 26px;
    border-bottom: 1px solid var(--colour-border);
    color: var(--colour-navy);
    font-weight: 600;
}

.principle:nth-child(odd) {
    border-right: 1px solid var(--colour-border);
}

.principle-number {
    flex: 0 0 auto;
    color: var(--colour-blue);
    font-weight: 750;
}

/* Collaboration list */

.collaboration-list {
    margin: 18px 0 0;
    padding: 0;
    max-width: 680px;
    list-style: none;
}

.collaboration-list li {
    padding: 14px 0;
    border-bottom: 1px solid var(--colour-border);
    color: var(--colour-muted);
}

/* Collaborate page */

.section-collaborate {
    padding: 96px 0;
    background: var(--colour-white);
}

.section-collaborate .section-title {
    max-width: 700px;
    font-family: var(--font-display);
    font-size: clamp(1.85rem, 3vw, 2.5rem);
    font-weight: 680;
    letter-spacing: -0.03em;
    line-height: 1.08;
}

.section-collaborate .section-introduction {
    max-width: 560px;
    margin-top: 18px;
    font-size: 1.08rem;
    line-height: 1.75;
}

.engagement-list {
    margin-top: 52px;
    border-top: 1px solid var(--colour-border);
}

.engagement-row {
    display: grid;
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 34px;
    align-items: start;
    padding: 50px 0 48px;
    border-bottom: 1px solid var(--colour-border);
}

.engagement-row-number {
    padding-top: 8px;
    color: #9aa6b1;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.18em;
}

.engagement-row-content {
    max-width: 760px;
}

.engagement-row h3 {
    color: var(--colour-navy);
    font-family: var(--font-display);
    font-size: clamp(1.45rem, 2.2vw, 1.85rem);
    font-weight: 680;
    letter-spacing: -0.025em;
    line-height: 1.15;
}

.engagement-row p {
    margin-top: 14px;
    color: var(--colour-muted);
    font-size: clamp(1.02rem, 1.25vw, 1.12rem);
    line-height: 1.7;
}

/* Closing band */

.closing-band {
    padding: 88px 0;
    background: var(--colour-navy);
    color: var(--colour-white);
    text-align: center;
}

.closing-band .eyebrow {
    color: #8fb4d9;
}

.closing-band h2 {
    color: var(--colour-white);
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 2.6vw, 2.3rem);
    font-weight: 680;
    letter-spacing: -0.03em;
    line-height: 1.12;
}

.closing-band p {
    margin: 14px auto 0;
    max-width: 520px;
    color: rgba(255, 255, 255, 0.78);
}

.closing-band .button-primary {
    margin-top: 28px;
    background: var(--colour-white);
    color: var(--colour-navy);
    transition: background-color 180ms ease;
}

.closing-band .button-primary:hover,
.closing-band .button-primary:focus-visible {
    background: var(--colour-blue-light);
}

/* Footer */

.site-footer {
    padding: 40px 0;
    border-top: 1px solid var(--colour-border);
}

.footer-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    color: var(--colour-muted);
    font-size: 0.85rem;
}

.footer-row a:hover,
.footer-row a:focus-visible {
    color: var(--colour-blue);
}

/* Responsive: tablet */

@media (max-width: 900px) {
    .navigation {
        align-items: flex-start;
        flex-direction: column;
        padding: 22px 0;
    }

    .primary-navigation {
        width: 100%;
        flex-wrap: wrap;
        gap: 16px 24px;
    }

    .hero {
        min-height: auto;
        padding: 72px 0;
        background: var(--colour-white);
    }

    .hero-layout {
        grid-template-columns: 1fr;
        gap: 64px;
    }

    .hero-architecture {
        max-width: none;
        padding: 40px;
        border: 1px solid var(--colour-border);
        background: var(--colour-background);
    }

    .two-column,
    .principle-list {
        grid-template-columns: 1fr;
    }

    .principle:nth-child(odd) {
        border-right: none;
    }

    .engagement-row {
        grid-template-columns: 56px minmax(0, 1fr);
        gap: 24px;
    }

    .engagement-row-number {
        padding-top: 7px;
    }
}

/* Responsive: mobile */

@media (max-width: 600px) {
    .container {
        width: min(calc(100% - 32px), var(--page-width));
    }

    .primary-navigation {
        align-items: flex-start;
        flex-direction: column;
    }

    .primary-navigation .navigation-cta {
        width: 100%;
        text-align: center;
    }

    h1 {
        font-size: clamp(2.5rem, 12vw, 3.5rem);
    }

    .hero-actions {
        flex-direction: column;
    }

    .button {
        width: 100%;
    }

    .hero-architecture {
        padding: 34px 24px;
    }

    .section-collaborate {
        padding: 72px 0;
    }

    .engagement-list {
        margin-top: 40px;
    }

    .engagement-row {
        grid-template-columns: 1fr;
        gap: 12px;
        padding: 34px 0;
    }

    .engagement-row-number {
        padding-top: 0;
    }

    .engagement-row h3 {
        font-size: clamp(1.55rem, 8vw, 2rem);
    }

    .footer-row {
        flex-direction: column;
        align-items: flex-start;
    }
}