:root {
    --ink: #1d1d1f;
    --muted: #6e6e73;
    --paper: #fbfbfd;
    --paper-alt: #f1f1f4;
    --accent: #0a66d8;
    --accent-ink: #ffffff;
    --link: #0a66d8;
    --rule: rgba(0,0,0,.1);
    --nav-bg: rgba(251,251,253,.72);
    --radius: 22px;
    --max: 1120px;
    --gutter: 20px;
    color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
    :root {
        --ink: #f5f5f7;
        --muted: #a1a1a6;
        --paper: #000000;
        --paper-alt: #111114;
        --link: #4da3ff;
        --rule: rgba(255,255,255,.14);
        --nav-bg: rgba(0,0,0,.62);
    }
}
@media (min-width: 768px) { :root { --gutter: 40px; } }

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 18px;
    line-height: 1.6;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, system-ui, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 17px;
    line-height: 1.5;
    color: var(--ink);
    background-color: var(--paper);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}
@media (min-width: 768px) {
    body {
        font-size: 19px;
    }
}

.skip-link {
    position: absolute;
    top: 0;
    transform: translateY(-120%);
    left: 0;
    background: var(--accent);
    color: var(--accent-ink);
    padding: 8px 12px;
    text-decoration: none;
    border-radius: var(--radius);
    z-index: 100;
}

.skip-link:focus {
    transform: none;
    top: 0;
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}

.wordmark {
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--ink);
    text-decoration: none;
}

.site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--nav-bg);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--rule);
    height: 52px;
    padding: 0 var(--gutter);
}

.site-header nav {
    display: flex;
    gap: 32px;
    align-items: center;
}

.site-header nav a {
    color: var(--ink);
    opacity: 0.8;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: opacity 0.2s;
}

.site-header nav a:hover {
    opacity: 1;
}

.site-header nav .nav-cta {
    background-color: var(--accent);
    color: var(--accent-ink);
    padding: 6px 14px;
    border-radius: 980px;
    font-weight: 500;
    font-size: 0.9rem;
    opacity: 1;
    transition: background-color 0.2s;
}

.site-header nav .nav-cta:hover {
    filter: brightness(1.1);
}

main {
    flex: 1;
    width: 100%;
}

main > section {
    padding: clamp(72px, 11vw, 140px) var(--gutter);
}

main > section > * {
    max-width: var(--max);
    margin-left: auto;
    margin-right: auto;
}

main > :not(section) {
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--gutter);
    padding-right: var(--gutter);
    box-sizing: border-box;
}

.hero {
    padding-top: clamp(64px, 10vw, 120px);
    padding-bottom: clamp(48px, 8vw, 96px);
    text-align: center;
}

.eyebrow {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--link);
    margin-bottom: 16px;
    text-transform: none;
    letter-spacing: normal;
}

h1 {
    font-size: clamp(2.6rem, 7vw, 5rem);
    letter-spacing: -0.035em;
    line-height: 1.04;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--ink);
}

h2 {
    font-size: clamp(2rem, 4.5vw, 3.25rem);
    text-align: center;
    margin-bottom: 0.6em;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.08;
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    line-height: 1.08;
}

.lede {
    font-size: clamp(1.15rem, 2vw, 1.5rem);
    color: var(--muted);
    max-width: 40em;
    margin: 0 auto 40px;
    text-align: center;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 32px;
}

.button {
    display: inline-block;
    padding: 0.75em 1.5em;
    border-radius: 980px;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    transition: background-color 0.2s, color 0.2s;
    border: 1px solid transparent;
}

.button-primary {
    background-color: var(--accent);
    color: var(--accent-ink);
}

.button-primary:hover {
    filter: brightness(1.1);
}

.button-secondary {
    color: var(--link);
    border: 1px solid currentColor;
    background-color: transparent;
}

.button-secondary:hover {
    background-color: rgba(10, 102, 216, 0.05);
}

#what-it-does {
    background: var(--paper-alt);
}

#pilot {
    background: var(--paper-alt);
    text-align: center;
}

#pilot p {
    max-width: 36em;
    margin: 0 auto 32px;
    color: var(--muted);
}

.steps {
    counter-reset: step;
    list-style: none;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: clamp(32px, 5vw, 64px);
}

@media (max-width: 760px) {
    .steps {
        grid-template-columns: 1fr;
    }
}

.steps li {
    position: relative;
}

.steps li::before {
    counter-increment: step;
    content: "0" counter(step);
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--link);
    margin-bottom: 12px;
}

.steps h3 {
    margin-bottom: 12px;
}

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

.cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

@media (max-width: 760px) {
    .cards {
        grid-template-columns: 1fr;
    }
}

.card {
    background: var(--paper);
    border-radius: var(--radius);
    padding: clamp(28px, 4vw, 44px);
    box-shadow: 0 1px 2px rgba(0,0,0,.04);
}

.card h3 {
    margin-bottom: 12px;
}

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

.checklist {
    list-style: none;
    max-width: 36em;
    margin-left: auto;
    margin-right: auto;
}

.checklist li {
    position: relative;
    padding: 16px 0 16px 36px;
    border-bottom: 1px solid var(--rule);
    color: var(--ink);
    font-size: 1.15rem;
}

.checklist li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 24px;
    width: 16px;
    height: 8px;
    border-left: 3px solid var(--link);
    border-bottom: 3px solid var(--link);
    transform: rotate(-45deg);
}

.site-footer {
    padding: 40px var(--gutter);
    border-top: 1px solid var(--rule);
    text-align: center;
    margin-top: auto;
    font-size: 0.8rem;
    color: var(--muted);
}

.site-footer p {
    margin-bottom: 12px;
    max-width: var(--max);
    margin-left: auto;
    margin-right: auto;
}

.form {
    max-width: 640px;
    width: calc(100% - 2 * var(--gutter));
    margin: 0 auto 96px;
    padding: clamp(24px, 4vw, 44px);
    background: var(--paper-alt);
    border-radius: var(--radius);
}

.field {
    margin-bottom: 20px;
}

.field label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

input, select, textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--rule);
    border-radius: 12px;
    font-size: 16px;
    font-family: inherit;
    background: var(--paper);
    color: var(--ink);
}

.field-hint {
    font-size: 0.875rem;
    color: var(--muted);
    margin-top: 4px;
}

.form-error {
    color: #8a1c1c;
    font-size: 0.875rem;
    margin-top: 4px;
}

.notice {
    background: var(--paper-alt);
    border-radius: var(--radius);
    padding: 28px 24px;
    text-align: center;
    max-width: 720px;
    margin: 0 auto;
}
.notice p {
    margin: 0 0 8px;
}
.notice a {
    color: var(--link);
    font-weight: 600;
    text-decoration: none;
}
.notice a:hover {
    text-decoration: underline;
}

@media (max-width: 760px) {
    html {
        font-size: 16px;
    }
    
    .site-header {
        flex-direction: row;
        gap: 16px;
        padding: 0 var(--gutter);
    }
    
    .site-header nav {
        gap: 16px;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .button {
        width: 100%;
        max-width: 320px;
        text-align: center;
    }
    .form {
        margin-bottom: 56px;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
        scroll-behavior: auto !important;
    }
    .js .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 3px;
    border-radius: 6px;
}

/* Inbox mock */
.mail-mock {
    max-width: 760px;
    margin: 56px auto 0;
    text-align: left;
    background: var(--paper);
    border: 1px solid var(--rule);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 30px 80px -20px rgba(0,0,0,.25);
    font-size: 0.95rem;
}

.mail-bar {
    padding: 12px 16px;
    background: var(--paper-alt);
    border-bottom: 1px solid var(--rule);
    display: flex;
    gap: 6px;
}

.mail-bar span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--rule);
}

.mail-msg {
    padding: 20px 24px;
}

.mail-msg + .mail-msg {
    border-top: 1px solid var(--rule);
}

.mail-msg p {
    margin: 0 0 8px;
}

.mail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    color: var(--muted);
    font-size: 0.85rem;
}

.mail-meta strong {
    color: var(--ink);
}

.mail-subject {
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--ink);
}

.mail-reply {
    background: var(--paper-alt);
    border-left: 3px solid var(--accent);
}

.mail-tag {
    border-radius: 980px;
    padding: 2px 10px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--link);
    border: 1px solid currentColor;
}

.mail-points {
    padding-left: 1.2em;
    margin: 8px 0 12px;
}

.mail-points li {
    margin: 4px 0;
}

.mail-attach {
    display: inline-block;
    padding: 8px 12px;
    border-radius: 10px;
    border: 1px solid var(--rule);
    font-size: 0.85rem;
    font-weight: 500;
}

.mail-mock figcaption {
    padding: 12px 24px;
    font-size: 0.8rem;
    color: var(--muted);
    border-top: 1px solid var(--rule);
    text-align: center;
}

/* Scroll reveals */
.js .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.8s ease, transform 0.8s cubic-bezier(.2,.7,.2,1);
}

.js .reveal.is-visible {
    opacity: 1;
    transform: none;
}

/* Download page */
.page-intro {
    padding: clamp(64px, 10vw, 120px) var(--gutter) 32px;
    text-align: center;
}

.page-intro .lede {
    margin-left: auto;
    margin-right: auto;
}

#platforms {
    padding-top: 24px;
}

.notice a {
    color: var(--link);
    font-weight: 600;
}

.platforms {
    margin-bottom: 48px;
}

.platform {
    border: 1px solid var(--rule);
    border-radius: var(--radius);
    padding: 28px;
    background-color: var(--paper);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}
.platform ul {
    align-self: stretch;
}

.platform h2 {
    font-size: 1.5rem;
    margin-bottom: 12px;
    color: var(--ink);
    text-align: left;
}

.platform .status {
    display: inline-block;
    background-color: var(--paper-alt);
    color: var(--muted);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 20px;
}

.platform ul {
    list-style: none;
    margin-bottom: 24px;
}

.platform li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 12px;
    color: var(--muted);
}

.platform li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 10px;
    width: 8px;
    height: 8px;
    background-color: var(--accent);
    border-radius: 50%;
}

.button-disabled {
    color: var(--muted);
    border-color: var(--rule);
    background-color: var(--paper-alt);
    cursor: not-allowed;
    opacity: 0.6;
}

.button-disabled:hover {
    background-color: var(--paper-alt);
    filter: none;
}

#it-teams {
    background: var(--paper-alt);
}

#it-teams h2 {
    margin-bottom: 32px;
}

#it-teams p {
    color: var(--muted);
    margin-top: 32px;
    text-align: center;
}

/* Pilot form */
.hp {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.field-error {
    color: #8a1c1c;
    font-size: 0.875rem;
    margin: 4px 0 0;
}

.field-error:empty {
    display: none;
}

[aria-invalid="true"] {
    border-color: #8a1c1c;
}

.field-check {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.field-check .field-error {
    flex-basis: 100%;
}

.field-check input {
    width: auto;
}

.field-check label {
    flex: 1 1 0;
    min-width: 0;
}

#form-status {
    background-color: rgba(138, 28, 28, 0.05);
    border-left: 4px solid #8a1c1c;
    padding: 16px 20px;
    margin: 24px 0;
    max-width: 640px;
}

#form-status:not([hidden]) {
    display: block;
}

button[disabled] {
    opacity: 0.6;
    cursor: progress;
}
.form button[type="submit"] {
    border-radius: 980px;
    background: var(--accent);
    color: var(--accent-ink);
    padding: 0.75em 1.5em;
    border: none;
    cursor: pointer;
    font-weight: 500;
    font-size: 1rem;
}


button, input, select, textarea {
    font: inherit;
}

.page-intro:only-child {
    padding-bottom: clamp(96px, 14vw, 160px);
}
.page-intro:only-child .button {
    margin-top: 32px;
}

/* Admin sign-up list (functions/admin.js) */
.signups {
    background: var(--paper-alt);
}
.signup-firm,
.signup-date {
    color: var(--muted);
    font-size: 0.9rem;
}
.signup-details {
    display: grid;
    grid-template-columns: max-content 1fr;
    gap: 6px 16px;
    margin: 12px 0;
    font-size: 0.95rem;
}
.signup-details dt {
    color: var(--muted);
}
.signup-details dd {
    margin: 0;
}

.signup a {
    color: var(--link);
}

/* Long-form text pages (privacy.html) */
.prose {
    max-width: 40em;
    margin: 0 auto;
    padding: 0 var(--gutter) clamp(64px, 10vw, 120px);
}
.prose h2 {
    font-size: 1.35rem;
    text-align: left;
    margin: 40px 0 12px;
}
.prose p,
.prose li {
    color: var(--muted);
    margin-bottom: 12px;
}
.prose ul {
    padding-left: 1.2em;
}
.prose a {
    color: var(--link);
}

.site-footer a {
    color: inherit;
    text-decoration: underline;
}