/*
 * Frozen Peak Solutions website.
 *
 * Every colour, typeface, size, radius and timing comes from the brand tokens in
 * brand/web/brand.css (synchronised from libraries/company/brand; do not edit that file).
 * Colours are brand roles, so both colour modes follow the system setting and
 * keep WCAG 2.2 AA contrast. Layout values that are not brand tokens are
 * page-specific and defined here once.
 */

:root {
    --page-width: 72rem;
    --page-gutter: clamp(var(--fps-space-m), 5vw, var(--fps-space-xxl));
    --section-space: clamp(var(--fps-space-xxxl), 10vw, 8rem);
    --header-height: 4.25rem;
}

/* Base */

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-height) + var(--fps-space-m));
}

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

body {
    margin: 0;
    background: var(--fps-color-background);
    color: var(--fps-color-text);
    font: var(--fps-text-body);
    letter-spacing: var(--fps-text-body-tracking);
    font-synthesis: none;
    -webkit-font-smoothing: antialiased;
}

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

h1,
h2,
h3 {
    text-wrap: balance;
}

a {
    color: var(--fps-color-accent);
    text-decoration-thickness: 1px;
    text-underline-offset: 0.2em;
    transition: color var(--fps-duration-fast) var(--fps-easing-standard);
}

a:hover {
    text-decoration-thickness: 2px;
}

:focus-visible {
    outline: var(--fps-focus-width) solid var(--fps-color-focus);
    outline-offset: var(--fps-focus-offset);
    border-radius: var(--fps-radius-small);
}

.container {
    width: 100%;
    max-width: calc(var(--page-width) + 2 * var(--page-gutter));
    margin-inline: auto;
    padding-inline: var(--page-gutter);
}

.label {
    color: var(--fps-color-accent);
    font: var(--fps-text-label);
    letter-spacing: var(--fps-text-label-tracking);
    text-transform: uppercase;
}

.lead {
    max-width: 36rem;
    color: var(--fps-color-text-muted);
    font: var(--fps-text-lead);
    letter-spacing: var(--fps-text-lead-tracking);
}

.skip-link {
    position: absolute;
    top: var(--fps-space-xs);
    left: var(--fps-space-xs);
    z-index: 10;
    padding: var(--fps-space-xs) var(--fps-space-m);
    border-radius: var(--fps-radius-medium);
    background: var(--fps-color-accent-fill);
    color: var(--fps-color-on-accent);
    transform: translateY(-200%);
}

.skip-link:focus {
    transform: none;
}

/* Buttons */

.button {
    display: inline-flex;
    align-items: center;
    gap: var(--fps-space-xs);
    min-height: 2.75rem;
    padding: var(--fps-space-xs) var(--fps-space-l);
    border: 1px solid transparent;
    border-radius: var(--fps-radius-medium);
    font-weight: 600;
    text-decoration: none;
    transition:
        background-color var(--fps-duration-fast) var(--fps-easing-standard),
        border-color var(--fps-duration-fast) var(--fps-easing-standard);
}

.button--primary {
    background: var(--fps-color-accent-fill);
    color: var(--fps-color-on-accent);
}

.button--primary:hover {
    background: var(--fps-color-accent-fill-hover);
    color: var(--fps-color-on-accent);
}

.button--secondary {
    border-color: var(--fps-color-border-strong);
    background: var(--fps-color-surface);
    color: var(--fps-color-text);
}

.button--secondary:hover {
    border-color: var(--fps-color-accent);
    color: var(--fps-color-text);
}

/* Header */

.site-header {
    position: sticky;
    top: 0;
    z-index: 5;
    border-bottom: 1px solid var(--fps-color-border);
    background: var(--fps-color-background);
}

.site-header__inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--fps-space-xs) var(--fps-space-l);
    min-height: var(--header-height);
    padding-block: var(--fps-space-xs);
}

.wordmark {
    display: inline-flex;
    align-items: center;
    gap: var(--fps-space-s);
    color: var(--fps-color-text);
    font: var(--fps-text-title);
    letter-spacing: -0.01em;
    text-decoration: none;
}

.wordmark:hover {
    color: var(--fps-color-text);
}

.wordmark__mark {
    width: 2rem;
    height: 2rem;
}

.wordmark__suffix {
    color: var(--fps-color-text-muted);
    font-weight: 400;
}

.site-nav__list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--fps-space-xxs) var(--fps-space-l);
    padding: 0;
    list-style: none;
}

.site-nav__list a {
    color: var(--fps-color-text-muted);
    font: var(--fps-text-small);
    font-weight: 500;
    text-decoration: none;
}

.site-nav__list a:hover,
.site-nav__list a[aria-current] {
    color: var(--fps-color-text);
}

.site-nav__list a[aria-current] {
    text-decoration: underline;
    text-decoration-color: var(--fps-color-accent);
    text-decoration-thickness: 2px;
    text-underline-offset: 0.45em;
}

/* Hero */

.hero {
    position: relative;
    overflow: hidden;
    padding-block: clamp(var(--fps-space-xxl), 8vw, var(--fps-space-huge)) clamp(var(--fps-space-xl), 6vw, var(--fps-space-xxxl));
    border-bottom: 1px solid var(--fps-color-border);
}

/* A faint survey grid behind the hero, fading out towards the edges. */
.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--fps-color-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--fps-color-border) 1px, transparent 1px);
    background-size: var(--fps-space-xxl) var(--fps-space-xxl);
    /* A mask uses only the opacity of its colours, so any opaque brand colour works here. */
    mask-image: radial-gradient(ellipse 70% 80% at 70% 40%, var(--fps-color-text) 20%, transparent 75%);
    pointer-events: none;
}

.hero__grid {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: center;
    gap: var(--fps-space-xxl);
}

.hero__copy {
    display: grid;
    gap: var(--fps-space-l);
}

.hero__title {
    font: var(--fps-text-display);
    letter-spacing: var(--fps-text-display-tracking);
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--fps-space-s);
}

.status {
    display: flex;
    align-items: baseline;
    gap: var(--fps-space-s);
    max-width: 36rem;
    padding-top: var(--fps-space-l);
    border-top: 1px solid var(--fps-color-border);
    color: var(--fps-color-text-muted);
    font: var(--fps-text-small);
}

.status__dot {
    flex: none;
    width: 0.5rem;
    height: 0.5rem;
    border-radius: var(--fps-radius-full);
    background: var(--fps-color-success);
    transform: translateY(-0.1em);
}

.hero__art {
    width: 100%;
    height: auto;
}

.range__rings {
    fill: none;
    stroke: var(--fps-color-decor-far);
    stroke-width: 1.5;
    stroke-dasharray: 3 7;
}

.range__far {
    fill: var(--fps-color-decor-far);
}

.range__lit {
    fill: var(--fps-color-decor-lit);
}

.range__shade {
    fill: var(--fps-color-decor-shade);
}

.range__snow {
    fill: var(--fps-color-decor-highlight);
}

.range__ground {
    stroke: var(--fps-color-border-strong);
    stroke-width: 1.5;
}

/* Sections */

.section {
    padding-block: var(--section-space);
}

.section--sunken {
    border-block: 1px solid var(--fps-color-border);
    background: var(--fps-color-surface-sunken);
}

.section__header {
    display: grid;
    gap: var(--fps-space-s);
    max-width: 44rem;
    margin-bottom: var(--fps-space-xxl);
}

.section__title {
    font: var(--fps-text-h1);
    letter-spacing: var(--fps-text-h1-tracking);
}

.section__intro {
    color: var(--fps-color-text-muted);
    font: var(--fps-text-lead);
    letter-spacing: var(--fps-text-lead-tracking);
}

/* Product lines */

.products {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 19rem), 1fr));
    gap: var(--fps-space-l);
    padding: 0;
    list-style: none;
}

.product {
    display: grid;
    grid-template-rows: auto auto 1fr;
    gap: var(--fps-space-m);
    padding: var(--fps-space-xl);
    border: 1px solid var(--fps-color-border);
    border-radius: var(--fps-radius-large);
    background: var(--fps-color-surface);
}

.product__icon {
    width: 2.5rem;
    height: 2.5rem;
    padding: var(--fps-space-xs);
    border-radius: var(--fps-radius-medium);
    background: var(--fps-color-accent-subtle);
    color: var(--fps-color-accent);
}

.product__title {
    font: var(--fps-text-h3);
    letter-spacing: var(--fps-text-h3-tracking);
}

.product__summary {
    color: var(--fps-color-text-muted);
}

.commitments {
    display: grid;
    align-content: start;
    gap: var(--fps-space-s);
    padding: var(--fps-space-m) 0 0;
    border-top: 1px solid var(--fps-color-border);
    list-style: none;
    font: var(--fps-text-small);
}

.commitments li {
    position: relative;
    padding-left: var(--fps-space-l);
}

.commitments li::before {
    content: "";
    position: absolute;
    top: 0.4em;
    left: 0.15rem;
    width: 0.65rem;
    height: 0.35rem;
    border-bottom: 2px solid var(--fps-color-accent);
    border-left: 2px solid var(--fps-color-accent);
    transform: rotate(-45deg);
}

/* Principles: numbered because their order decides conflicts. */

.principles {
    display: grid;
    /* Two columns at most, so ten principles fill five full rows. */
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 26rem), 1fr));
    gap: var(--fps-space-xl) var(--fps-space-xxl);
    padding: 0;
    list-style: none;
    counter-reset: principle;
}

.principle {
    display: grid;
    align-content: start;
    gap: var(--fps-space-xs);
    padding-top: var(--fps-space-m);
    border-top: 1px solid var(--fps-color-border-strong);
    counter-increment: principle;
}

.principle::before {
    content: counter(principle, decimal-leading-zero);
    color: var(--fps-color-accent);
    font: var(--fps-text-label);
    letter-spacing: var(--fps-text-label-tracking);
}

.principle__title {
    font: var(--fps-text-title);
    letter-spacing: var(--fps-text-title-tracking);
}

.principle p {
    color: var(--fps-color-text-muted);
}

/* Open source */

.openness {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
    gap: var(--fps-space-xxl);
    padding: clamp(var(--fps-space-xl), 5vw, var(--fps-space-xxxl));
    border: 1px solid var(--fps-color-border);
    border-radius: var(--fps-radius-large);
    background: var(--fps-color-accent-subtle);
}

.openness__header {
    display: grid;
    align-content: start;
    gap: var(--fps-space-s);
}

.openness__points {
    display: grid;
    gap: var(--fps-space-l);
}

.openness__point {
    display: grid;
    gap: var(--fps-space-xxs);
}

.openness__point dt {
    font: var(--fps-text-title);
    letter-spacing: var(--fps-text-title-tracking);
}

.openness__point dd {
    margin: 0;
    color: var(--fps-color-text-muted);
}

.product__status {
    padding-top: var(--fps-space-s);
    border-top: 1px solid var(--fps-color-border);
    color: var(--fps-color-text-muted);
    font: var(--fps-text-small);
}

/* Structural Suite */

.pillars {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr));
    gap: var(--fps-space-l);
    padding: 0;
    list-style: none;
}

.pillar {
    display: grid;
    grid-template-rows: auto 1fr auto;
    gap: var(--fps-space-s);
    padding: var(--fps-space-xl);
    border: 1px solid var(--fps-color-border);
    border-radius: var(--fps-radius-large);
    background: var(--fps-color-surface);
}

.pillar__name {
    font: var(--fps-text-h3);
    letter-spacing: var(--fps-text-h3-tracking);
}

.pillar__promise {
    color: var(--fps-color-text-muted);
}

/* What exists today, set apart from the promise above it. */
.pillar__today {
    padding: var(--fps-space-s) var(--fps-space-m);
    border-radius: var(--fps-radius-medium);
    background: var(--fps-color-surface-sunken);
    color: var(--fps-color-text);
    font: var(--fps-text-small);
}

.pillar__today-label {
    display: block;
    margin-bottom: var(--fps-space-xxs);
    color: var(--fps-color-success);
    font: var(--fps-text-label);
    letter-spacing: var(--fps-text-label-tracking);
    text-transform: uppercase;
}

/* Notebook */

.contents {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 24rem), 1fr));
    gap: var(--fps-space-l);
    padding: 0;
    list-style: none;
}

.content-kind {
    display: grid;
    align-content: start;
    gap: var(--fps-space-s);
    padding: var(--fps-space-xl);
    border: 1px solid var(--fps-color-border);
    border-radius: var(--fps-radius-large);
    background: var(--fps-color-surface);
}

.content-kind__heading {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: var(--fps-space-xs);
}

.content-kind__name {
    font: var(--fps-text-h3);
    letter-spacing: var(--fps-text-h3-tracking);
}

.content-kind p {
    color: var(--fps-color-text-muted);
}

/* Linked cards in the brand's illustration colours, drawn like the peaks of the mark. */
.notebook-art__links path {
    fill: none;
    stroke: var(--fps-color-decor-far);
    stroke-width: 2;
    stroke-dasharray: 4 6;
}

.notebook-art__far {
    fill: var(--fps-color-decor-far);
}

.notebook-art__lit {
    fill: var(--fps-color-decor-lit);
}

.notebook-art__shade {
    fill: var(--fps-color-decor-shade);
}

.notebook-art__lines path {
    fill: none;
    stroke: var(--fps-color-decor-highlight);
    stroke-width: 4;
    stroke-linecap: round;
}

.product__link {
    font-weight: 600;
}

.section__outro {
    max-width: 44rem;
    margin-top: var(--fps-space-xl);
    color: var(--fps-color-text-muted);
}

/* Status badges: the word carries the meaning, the colour repeats it. */

.badge {
    display: inline-block;
    padding: 0.1em var(--fps-space-xs);
    border: 1px solid transparent;
    border-radius: var(--fps-radius-full);
    font: var(--fps-text-caption);
    letter-spacing: var(--fps-text-caption-tracking);
    white-space: nowrap;
    vertical-align: 0.1em;
}

.badge--done {
    background: var(--fps-color-success-subtle);
    color: var(--fps-color-success);
}

.badge--in-progress {
    background: var(--fps-color-accent-subtle);
    color: var(--fps-color-accent);
}

.badge--planned {
    border-color: var(--fps-color-border-strong);
    color: var(--fps-color-text-muted);
}

/* Inner pages */

.page-intro {
    display: grid;
    padding-block: clamp(var(--fps-space-xxl), 7vw, var(--fps-space-xxxl)) var(--fps-space-xl);
    border-bottom: 1px solid var(--fps-color-border);
}

.page-intro .container {
    display: grid;
    gap: var(--fps-space-m);
}

.page-intro__title {
    font: var(--fps-text-h1);
    letter-spacing: var(--fps-text-h1-tracking);
}

.page-intro .lead {
    max-width: 44rem;
}

.page-intro__note {
    color: var(--fps-color-text-muted);
    font: var(--fps-text-small);
}

code {
    font-family: var(--fps-font-mono);
    font-size: 0.9em;
}

.entries,
.catalogue {
    display: grid;
    gap: var(--fps-space-xxl);
    padding-block: var(--fps-space-xxl) var(--section-space);
}

.entry {
    display: grid;
    gap: var(--fps-space-l);
    padding: clamp(var(--fps-space-l), 4vw, var(--fps-space-xxl));
    border: 1px solid var(--fps-color-border);
    border-radius: var(--fps-radius-large);
    background: var(--fps-color-surface);
}

.entry__meta {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: var(--fps-space-xs);
    color: var(--fps-color-text-muted);
    font: var(--fps-text-small);
}

.entry__body {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: var(--fps-space-xl) var(--fps-space-xxl);
}

.entry__part {
    display: grid;
    align-content: start;
    gap: var(--fps-space-s);
}

.entry__part h2 {
    font: var(--fps-text-title);
    letter-spacing: var(--fps-text-title-tracking);
}

.entry__part h2:not(:first-child) {
    margin-top: var(--fps-space-s);
}

.entry__part p {
    color: var(--fps-color-text-muted);
}

.table-scroll {
    max-width: 100%;
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font: var(--fps-text-small);
}

.data-table th,
.data-table td {
    padding: var(--fps-space-xs) var(--fps-space-s) var(--fps-space-xs) 0;
    border-bottom: 1px solid var(--fps-color-border);
    text-align: left;
    vertical-align: top;
}

.data-table thead th {
    color: var(--fps-color-text-muted);
    font: var(--fps-text-label);
    letter-spacing: var(--fps-text-label-tracking);
    text-transform: uppercase;
}

.data-table td {
    color: var(--fps-color-text-muted);
    font-variant-numeric: tabular-nums;
}

.data-table tbody th {
    font-weight: 500;
    white-space: nowrap;
}

.catalogue-group {
    display: grid;
    gap: var(--fps-space-m);
}

.catalogue-group__title {
    font: var(--fps-text-h2);
    letter-spacing: var(--fps-text-h2-tracking);
}

.phases {
    display: grid;
    gap: 0;
    padding: 0;
    list-style: none;
}

/* A vertical rail: each phase is a stop on it, filled when done. */
.phase {
    position: relative;
    display: grid;
    gap: var(--fps-space-xxs);
    padding: 0 0 var(--fps-space-l) var(--fps-space-xl);
    border-left: 2px solid var(--fps-color-border);
    margin-left: var(--fps-space-xs);
}

.phase:last-child {
    padding-bottom: 0;
}

.phase::before {
    content: "";
    position: absolute;
    top: 0.3rem;
    left: -0.5625rem;
    width: 1rem;
    height: 1rem;
    border: 2px solid var(--fps-color-border-strong);
    border-radius: var(--fps-radius-full);
    background: var(--fps-color-background);
}

.phase--done::before {
    border-color: var(--fps-color-success);
    background: var(--fps-color-success);
}

.phase--in-progress::before {
    border-color: var(--fps-color-accent);
    background: var(--fps-color-accent-subtle);
}

.phase__heading {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: var(--fps-space-xs);
}

.phase__name {
    font: var(--fps-text-title);
    letter-spacing: var(--fps-text-title-tracking);
}

.phase p {
    max-width: 44rem;
    color: var(--fps-color-text-muted);
}

/* 404 page */

.not-found {
    display: grid;
    justify-items: start;
    gap: var(--fps-space-l);
    padding-block: var(--section-space);
}

.not-found__title {
    font: var(--fps-text-display);
    letter-spacing: var(--fps-text-display-tracking);
}

/* Footer */

.site-footer {
    padding-block: var(--fps-space-xxl);
    border-top: 1px solid var(--fps-color-border);
    color: var(--fps-color-text-muted);
    font: var(--fps-text-small);
}

.site-footer__inner {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: var(--fps-space-m) var(--fps-space-xxl);
}

.site-footer__notes {
    display: grid;
    gap: var(--fps-space-xxs);
}

.site-footer a {
    color: var(--fps-color-text-muted);
}

.site-footer a:hover {
    color: var(--fps-color-text);
}

/* Narrow screens */

@media (max-width: 52rem) {
    .hero__grid,
    .openness,
    .entry__body {
        grid-template-columns: minmax(0, 1fr);
    }

    .hero__title,
    .not-found__title {
        font: var(--fps-text-h1);
        letter-spacing: var(--fps-text-h1-tracking);
    }

    .section__title {
        font: var(--fps-text-h2);
        letter-spacing: var(--fps-text-h2-tracking);
    }

    .hero__art {
        max-width: 28rem;
    }

    .site-header {
        position: static;
    }
}