:root {
    --background: #f4f3ee;
    --surface: #fbfaf7;
    --surface-hover: #ffffff;
    --text: #1a1d1b;
    --muted: #70736f;
    --line: #d9dad4;
    --line-strong: #bfc4bd;
    --accent: #285b4d;
    --accent-soft: #dfe8e3;
    --radius: 18px;
    --shadow: 0 14px 40px rgba(31, 40, 36, 0.06);
    --max-width: 1440px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-width: 320px;
    background:
        radial-gradient(circle at 85% 0%, rgba(40, 91, 77, 0.07), transparent 30rem),
        var(--background);
    color: var(--text);
    font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
}

button,
input {
    font: inherit;
}

.page-shell {
    width: min(100% - 48px, var(--max-width));
    margin: 0 auto;
}

.hero {
    padding: 36px 0 42px;
    border-bottom: 1px solid var(--line);
}

.hero__topline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: clamp(72px, 10vw, 148px);
}

.brand {
    color: var(--text);
    font-size: 14px;
    font-weight: 650;
    letter-spacing: -0.01em;
    text-decoration: none;
}

.hero__count,
.toolbar__meta {
    color: var(--muted);
    font-size: 13px;
}

.hero__content {
    max-width: 820px;
}

.eyebrow {
    margin: 0 0 16px;
    color: var(--accent);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.11em;
    text-transform: uppercase;
}

h1 {
    margin: 0;
    font-size: clamp(52px, 8vw, 112px);
    font-weight: 560;
    letter-spacing: -0.065em;
    line-height: 0.88;
}

.hero__intro {
    max-width: 620px;
    margin: 30px 0 0;
    color: var(--muted);
    font-size: clamp(16px, 1.6vw, 20px);
    line-height: 1.55;
}

.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    margin-top: 54px;
}

.search {
    position: relative;
    display: block;
    width: min(100%, 460px);
}

.search__icon {
    position: absolute;
    top: 50%;
    left: 17px;
    width: 18px;
    height: 18px;
    fill: none;
    stroke: var(--muted);
    stroke-linecap: round;
    stroke-width: 1.7;
    transform: translateY(-50%);
    pointer-events: none;
}

.search input {
    width: 100%;
    height: 48px;
    padding: 0 46px;
    border: 1px solid var(--line);
    border-radius: 999px;
    outline: none;
    background: rgba(251, 250, 247, 0.78);
    color: var(--text);
    transition: border-color 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

.search input::placeholder {
    color: #969994;
}

.search input:hover {
    border-color: var(--line-strong);
    background: var(--surface);
}

.search input:focus {
    border-color: var(--accent);
    background: var(--surface);
    box-shadow: 0 0 0 4px rgba(40, 91, 77, 0.09);
}

.projects {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: 16px;
    padding: 28px 0 72px;
}

.project-card {
    position: relative;
    scroll-margin-top: 24px;
    min-width: 0;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(251, 250, 247, 0.82);
    transition:
        transform 180ms ease,
        border-color 180ms ease,
        background 180ms ease,
        box-shadow 180ms ease;
}

.project-card:hover {
    border-color: var(--line-strong);
    background: var(--surface-hover);
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.project-card:has(details[open]) {
    grid-column: 1 / -1;
    background: var(--surface-hover);
    box-shadow: var(--shadow);
    transform: none;
}

.project-card__body {
    padding: 24px 24px 22px;
}

.project-card__meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 38px;
    color: var(--muted);
    font-size: 12px;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.project-card__number {
    color: var(--accent);
    font-weight: 700;
}

.project-card__link {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 20px;
    text-decoration: none;
}

.project-card__title {
    margin: 0;
    font-size: 24px;
    font-weight: 610;
    letter-spacing: -0.035em;
    line-height: 1.08;
}

.project-card__arrow {
    flex: 0 0 auto;
    width: 26px;
    height: 26px;
    color: var(--accent);
    transition: transform 160ms ease;
}

.project-card__arrow svg,
.page-list__arrow svg {
    display: block;
    width: 100%;
    height: 100%;
}

.project-card__link:hover .project-card__arrow,
.project-card__link:focus-visible .project-card__arrow {
    transform: translate(2px, -2px);
}

.project-card__description {
    min-height: 48px;
    margin: 16px 0 0;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.55;
}

.project-card__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-top: 34px;
    padding-top: 18px;
    border-top: 1px solid var(--line);
}

.project-card__pages-count {
    color: var(--muted);
    font-size: 12px;
}

.project-card details {
    margin: 0 -24px -22px;
}

.project-card summary {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 24px;
    color: var(--accent);
    cursor: pointer;
    font-size: 12px;
    font-weight: 700;
    list-style: none;
    transition: background 160ms ease;
}

.project-card summary::-webkit-details-marker {
    display: none;
}

.project-card summary:hover {
    background: rgba(40, 91, 77, 0.055);
}

.project-card summary:focus-visible,
.project-card__link:focus-visible,
.page-list__link:focus-visible,
.brand:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

.project-card summary:focus-visible {
    outline-offset: -3px;
}

.project-card summary::after {
    width: 7px;
    height: 7px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    content: "";
    transform: translateY(-2px) rotate(45deg);
    transition: transform 160ms ease;
}

.project-card details[open] summary::after {
    transform: translateY(2px) rotate(225deg);
}

.page-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin: 0;
    padding: 10px 24px 24px;
    list-style: none;
}

.page-list__item {
    min-width: 0;
    border-top: 1px solid var(--line);
}

.page-list__link {
    display: grid;
    grid-template-columns: 36px minmax(0, 1fr) 18px;
    align-items: center;
    gap: 8px;
    min-height: 48px;
    padding: 6px 8px 6px 0;
    color: var(--text);
    font-size: 13px;
    text-decoration: none;
}

.page-list__index {
    color: #a1a49f;
    font-size: 10px;
    font-variant-numeric: tabular-nums;
}

.page-list__name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.page-list__arrow {
    width: 18px;
    height: 18px;
    color: var(--muted);
    transition: color 160ms ease, transform 160ms ease;
}

.page-list__link:hover .page-list__name,
.page-list__link:focus-visible .page-list__name {
    color: var(--accent);
}

.page-list__link:hover .page-list__arrow,
.page-list__link:focus-visible .page-list__arrow {
    color: var(--accent);
    transform: translate(1px, -1px);
}

.empty-state {
    margin: 80px 0 120px;
    color: var(--muted);
    font-size: 18px;
    text-align: center;
}

.footer {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    padding: 24px 0 40px;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: 12px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

[hidden] {
    display: none !important;
}

@media (max-width: 1040px) {
    .projects {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .page-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 700px) {
    .page-shell {
        width: min(100% - 28px, var(--max-width));
    }

    .hero {
        padding-top: 24px;
    }

    .hero__topline {
        gap: 12px;
        margin-bottom: 72px;
    }

    .hero__count {
        white-space: nowrap;
    }

    h1 {
        font-size: clamp(52px, 18vw, 78px);
    }

    .hero__intro {
        margin-top: 22px;
        font-size: 16px;
    }

    .toolbar {
        align-items: stretch;
        flex-direction: column;
        margin-top: 38px;
    }

    .search {
        width: 100%;
    }

    .toolbar__meta {
        margin: 0;
    }

    .projects {
        grid-template-columns: 1fr;
        gap: 12px;
        padding-top: 18px;
    }

    .project-card:has(details[open]) {
        grid-column: auto;
    }

    .project-card__body {
        padding: 20px;
    }

    .project-card__meta {
        margin-bottom: 30px;
    }

    .project-card__description {
        min-height: 0;
    }

    .project-card details {
        margin: 0 -20px -20px;
    }

    .project-card summary {
        padding-inline: 20px;
    }

    .page-list {
        grid-template-columns: 1fr;
        padding: 8px 20px 20px;
    }

    .footer {
        flex-direction: column;
        gap: 8px;
    }
}

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

    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
    }
}