/* =========================================================
   Base
   ========================================================= */

:root {
    --background: #f7f7f4;
    --surface: #ffffff;
    --text: #171717;
    --muted: #626262;
    --border: #d8d8d3;

    --accent: #173f5f;
    --accent-hover: #0d2d46;

    --max-width: 1180px;

    --radius-small: 6px;
    --radius-medium: 12px;
}


* {
    box-sizing: border-box;
}


html {
    scroll-behavior: smooth;
}


body {
    margin: 0;

    background: var(--background);

    color: var(--text);

    font-family:
        Inter,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        Helvetica,
        Arial,
        sans-serif;

    font-size: 16px;

    line-height: 1.65;

    -webkit-font-smoothing: antialiased;
}


a {
    color: inherit;

    text-decoration: none;
}


a:hover {
    color: var(--accent);
}


img {
    display: block;

    max-width: 100%;

    height: auto;
}


h1,
h2,
h3,
p {
    margin-top: 0;
}


h1,
h2,
h3 {
    line-height: 1.15;

    font-weight: 600;
}


p {
    color: var(--muted);
}



/* =========================================================
   Navigation
   ========================================================= */

.site-nav {
    width: calc(100% - 40px);

    max-width: var(--max-width);

    margin: 0 auto;

    padding: 28px 0;

    display: flex;

    align-items: center;

    justify-content: space-between;

    border-bottom: 1px solid var(--border);
}


.site-logo {
    color: var(--text);

    font-size: 1.05rem;

    font-weight: 650;

    letter-spacing: -0.01em;
}


.nav-links {
    display: flex;

    align-items: center;

    gap: 32px;
}


.nav-links a {
    color: var(--muted);

    font-size: 0.94rem;
}


.nav-links a:hover {
    color: var(--text);
}



/* =========================================================
   Hero
   ========================================================= */

.hero {
    width: calc(100% - 40px);

    max-width: var(--max-width);

    min-height: 620px;

    margin: 0 auto;

    padding: 120px 0 100px;

    display: flex;

    align-items: center;
}


.hero-content {
    max-width: 900px;
}


.eyebrow {
    margin-bottom: 24px;

    color: var(--accent);

    font-size: 0.82rem;

    font-weight: 650;

    text-transform: uppercase;

    letter-spacing: 0.12em;
}


.hero h1 {
    margin-bottom: 16px;

    font-size: clamp(3.2rem, 8vw, 6.8rem);

    letter-spacing: -0.055em;
}


.hero h2 {
    max-width: 850px;

    margin-bottom: 28px;

    color: var(--muted);

    font-size: clamp(1.8rem, 4vw, 3.4rem);

    font-weight: 400;

    letter-spacing: -0.035em;
}


.hero-description {
    max-width: 680px;

    margin-bottom: 40px;

    font-size: 1.17rem;
}


.hero-actions {
    display: flex;

    flex-wrap: wrap;

    gap: 14px;
}



/* =========================================================
   Buttons
   ========================================================= */

.button {
    display: inline-flex;

    align-items: center;

    justify-content: center;

    min-height: 48px;

    padding: 0 22px;

    border: 1px solid var(--text);

    border-radius: var(--radius-small);

    font-size: 0.95rem;

    font-weight: 550;

    transition:
        background 0.18s ease,
        color 0.18s ease,
        border-color 0.18s ease;
}


.button-primary {
    background: var(--text);

    color: #ffffff;
}


.button-primary:hover {
    background: var(--accent);

    border-color: var(--accent);

    color: #ffffff;
}


.button-secondary {
    background: transparent;

    color: var(--text);
}


.button-secondary:hover {
    background: var(--surface);

    color: var(--text);
}



/* =========================================================
   Main Content Sections
   ========================================================= */

.content-section {
    width: calc(100% - 40px);

    max-width: var(--max-width);

    margin: 0 auto;

    padding: 100px 0;

    display: grid;

    grid-template-columns: 180px 1fr;

    gap: 70px;

    border-top: 1px solid var(--border);
}


.section-label p {
    margin: 4px 0 0;

    color: var(--muted);

    font-size: 0.78rem;

    font-weight: 650;

    text-transform: uppercase;

    letter-spacing: 0.1em;
}


.section-content {
    min-width: 0;
}


.section-content > h2,
.section-heading-row h2 {
    margin-bottom: 36px;

    font-size: clamp(2rem, 4vw, 3rem);

    letter-spacing: -0.035em;
}


.section-heading-row {
    margin-bottom: 40px;

    display: flex;

    align-items: end;

    justify-content: space-between;

    gap: 30px;
}


.section-heading-row h2 {
    margin-bottom: 0;
}


.text-link {
    flex-shrink: 0;

    color: var(--accent);

    font-size: 0.92rem;

    font-weight: 550;
}



/* =========================================================
   About
   ========================================================= */

.about-section .section-content {
    max-width: 820px;
}


.large-text {
    color: var(--text);

    font-size: clamp(1.3rem, 2.3vw, 1.65rem);

    line-height: 1.55;
}



/* =========================================================
   Featured Projects
   ========================================================= */

.featured-projects {
    border-top: 1px solid var(--border);
}


.featured-project-card {
    padding: 38px 0;

    display: grid;

    grid-template-columns: 70px 1fr;

    gap: 22px;

    border-bottom: 1px solid var(--border);
}


.project-number {
    margin: 4px 0 0;

    color: var(--muted);

    font-family: monospace;

    font-size: 0.82rem;
}


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


.project-category {
    margin-bottom: 12px;

    color: var(--accent);

    font-size: 0.76rem;

    font-weight: 650;

    text-transform: uppercase;

    letter-spacing: 0.08em;
}


.featured-project-card h3 {
    margin-bottom: 16px;

    font-size: clamp(1.5rem, 3vw, 2.1rem);

    letter-spacing: -0.025em;
}


.featured-project-card p {
    max-width: 720px;
}


.project-link {
    display: inline-block;

    margin-top: 8px;

    color: var(--text);

    font-size: 0.92rem;

    font-weight: 600;
}


.project-link:hover {
    color: var(--accent);
}



/* =========================================================
   Capabilities
   ========================================================= */

.capabilities-grid {
    display: grid;

    grid-template-columns: repeat(2, 1fr);

    border-top: 1px solid var(--border);

    border-left: 1px solid var(--border);
}


.capability {
    min-height: 260px;

    padding: 32px;

    border-right: 1px solid var(--border);

    border-bottom: 1px solid var(--border);
}


.capability h3 {
    margin-bottom: 18px;

    font-size: 1.25rem;
}


.capability p {
    margin-bottom: 24px;
}


.capability .tools {
    margin-bottom: 0;

    color: var(--text);

    font-size: 0.84rem;

    font-weight: 550;
}



/* =========================================================
   Timeline
   ========================================================= */

.timeline {
    border-top: 1px solid var(--border);
}


.timeline-item {
    padding: 34px 0;

    display: grid;

    grid-template-columns: minmax(130px, 180px) 1fr;

    gap: 30px;

    border-bottom: 1px solid var(--border);
}


.timeline-date p {
    margin: 3px 0 0;

    color: var(--muted);

    font-size: 0.82rem;
}


.timeline-content h3 {
    margin-bottom: 5px;

    font-size: 1.3rem;
}


.timeline-organisation {
    margin-bottom: 14px;

    color: var(--accent);

    font-size: 0.92rem;

    font-weight: 550;
}


.timeline-content > p:last-child {
    max-width: 680px;

    margin-bottom: 0;
}



/* =========================================================
   Contact
   ========================================================= */

.contact-section {
    width: calc(100% - 40px);

    max-width: var(--max-width);

    margin: 0 auto;

    padding: 120px 0;

    border-top: 1px solid var(--border);
}


.contact-section h2 {
    max-width: 800px;

    margin-bottom: 20px;

    font-size: clamp(2.4rem, 6vw, 5rem);

    letter-spacing: -0.05em;
}


.contact-section > p:not(.eyebrow) {
    max-width: 600px;

    font-size: 1.1rem;
}


.contact-links {
    margin-top: 40px;

    display: flex;

    flex-wrap: wrap;

    gap: 30px;
}


.contact-links a {
    color: var(--text);

    font-weight: 600;
}


.contact-links a:hover {
    color: var(--accent);
}



/* =========================================================
   Footer
   ========================================================= */

.site-footer {
    width: calc(100% - 40px);

    max-width: var(--max-width);

    margin: 0 auto;

    padding: 30px 0 45px;

    display: flex;

    justify-content: space-between;

    gap: 20px;

    border-top: 1px solid var(--border);
}


.site-footer p {
    margin: 0;

    font-size: 0.78rem;
}



/* =========================================================
   Existing Project Pages
   ========================================================= */

.project-page {
    width: calc(100% - 40px);

    max-width: 1000px;

    margin: 0 auto;

    padding: 80px 0 100px;
}


.project-header {
    margin-bottom: 80px;
}


.project-type {
    margin-bottom: 16px;

    color: var(--accent);

    font-size: 0.78rem;

    font-weight: 650;

    text-transform: uppercase;

    letter-spacing: 0.1em;
}


.project-header h1 {
    margin-bottom: 26px;

    font-size: clamp(2.8rem, 6vw, 5rem);

    letter-spacing: -0.05em;
}


.project-summary {
    max-width: 800px;

    font-size: 1.25rem;

    line-height: 1.6;
}


.project-section {
    margin-bottom: 70px;

    padding-top: 50px;

    border-top: 1px solid var(--border);
}


.project-section h2 {
    margin-bottom: 24px;

    font-size: clamp(1.7rem, 3vw, 2.3rem);

    letter-spacing: -0.025em;
}


.project-section p {
    max-width: 820px;
}


.project-section li {
    margin-bottom: 10px;

    color: var(--muted);
}



/* =========================================================
   Project Statistics
   ========================================================= */

.project-details {
    margin: 35px 0;

    display: grid;

    grid-template-columns:
        repeat(auto-fit, minmax(160px, 1fr));

    gap: 12px;
}


.project-detail {
    padding: 22px;

    background: var(--surface);

    border: 1px solid var(--border);

    border-radius: var(--radius-medium);
}


.project-detail h3 {
    margin-bottom: 8px;

    color: var(--muted);

    font-size: 0.78rem;

    text-transform: uppercase;

    letter-spacing: 0.07em;
}


.project-detail p {
    margin: 0;

    color: var(--text);

    font-size: 1.25rem;
}



/* =========================================================
   Project Skill Tags
   ========================================================= */

.skills-list {
    padding: 0;

    display: flex;

    flex-wrap: wrap;

    gap: 9px;

    list-style: none;
}


.skills-list li {
    margin: 0;

    padding: 7px 13px;

    background: var(--surface);

    border: 1px solid var(--border);

    border-radius: 100px;

    color: var(--text);

    font-size: 0.84rem;
}



/* =========================================================
   PDF Viewer
   ========================================================= */

.pdf-container {
    width: 100%;

    margin-top: 30px;

    overflow: hidden;

    background: var(--surface);

    border: 1px solid var(--border);

    border-radius: var(--radius-medium);
}


.pdf-viewer {
    display: block;

    width: 100%;

    height: 90vh;

    min-height: 600px;

    border: none;
}


.document-link {
    margin-top: 15px;
}


.document-link a {
    color: var(--accent);

    font-weight: 550;
}



/* =========================================================
   Projects Listing Page
   ========================================================= */

.project-card {
    padding: 38px 0;

    border-top: 1px solid var(--border);
}


.project-card:last-child {
    border-bottom: 1px solid var(--border);
}


.project-card h2 {
    margin-bottom: 14px;

    font-size: 1.7rem;
}


.project-card p {
    max-width: 750px;
}


.project-card a {
    color: var(--accent);

    font-weight: 600;
}



/* =========================================================
   Project Footer
   ========================================================= */

.project-footer {
    margin-top: 80px;

    padding-top: 30px;

    border-top: 1px solid var(--border);
}


.project-footer a {
    font-weight: 550;
}



/* =========================================================
   Tablet
   ========================================================= */

@media (max-width: 850px) {

    .hero {
        min-height: auto;

        padding: 90px 0;
    }


    .content-section {
        padding: 75px 0;

        grid-template-columns: 1fr;

        gap: 25px;
    }


    .section-label {
        margin-bottom: 5px;
    }


    .capabilities-grid {
        grid-template-columns: 1fr;
    }

}



/* =========================================================
   Mobile
   ========================================================= */

@media (max-width: 650px) {

    .site-nav {
        padding: 20px 0;
    }


    .nav-links {
        gap: 18px;
    }


    .nav-links a {
        font-size: 0.82rem;
    }


    .site-nav {
        flex-wrap: wrap;
        gap: 16px;
    }


    .hero {
        padding: 75px 0 70px;
    }


    .hero h1 {
        font-size: clamp(3rem, 17vw, 4.7rem);
    }


    .hero h2 {
        font-size: 1.8rem;
    }


    .hero-description {
        font-size: 1rem;
    }


    .content-section {
        padding: 65px 0;
    }


    .section-heading-row {
        align-items: flex-start;

        flex-direction: column;

        gap: 12px;
    }


    .featured-project-card {
        grid-template-columns: 40px 1fr;

        gap: 12px;
    }


    .capability {
        min-height: auto;

        padding: 25px;
    }


    .timeline-item {
        grid-template-columns: 1fr;

        gap: 8px;
    }


    .contact-section {
        padding: 80px 0;
    }


    .site-footer {
        flex-direction: column;

        gap: 5px;
    }


    .project-page {
        padding-top: 55px;
    }


    .project-header {
        margin-bottom: 60px;
    }


    .project-section {
        margin-bottom: 55px;

        padding-top: 40px;
    }


    .pdf-viewer {
        height: 75vh;

        min-height: 500px;
    }

}

/* Keyboard navigation */
a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible,
iframe:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 4px;
}

.skip-link {
    position: absolute;
    top: 8px;
    left: 12px;
    z-index: 1000;
    padding: 10px 16px;
    background: var(--text);
    color: #fff;
    transform: translateY(-200%);
}

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

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
}

/* Refinement: readable links, compact navigation and explicit mobile targets. */
.text-link { color: var(--accent); text-decoration: underline; text-underline-offset: 4px; }
.site-nav { gap: 14px 28px; padding: 20px 0; flex-wrap: wrap; }
.nav-links { gap: 8px 24px; flex-wrap: wrap; }
.nav-links a { display: inline-flex; align-items: center; min-height: 44px; }
.site-logo { min-height: 44px; display: inline-flex; align-items: center; }
.site-footer { width: calc(100% - 40px); max-width: var(--max-width); margin: auto; padding: 24px 0; border-top: 1px solid var(--border); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; font-size: .85rem; }
.site-footer p { margin: 0; }
.fallback-nav { width: calc(100% - 40px); max-width: var(--max-width); margin: 20px auto; }
.project-page { padding-top: 50px; }
.project-header { margin-bottom: 40px; }
.report-overview-link { display: inline-block; margin: 16px 0 24px; color: var(--accent); text-decoration: underline; text-underline-offset: 4px; }
@media(max-width: 650px) {
 .site-nav { align-items: flex-start; gap: 0; }
 .nav-links { width: 100%; justify-content: space-between; gap: 0 12px; }
 .nav-links a { font-size: .86rem; }
}