/*
 * The websites' one stylesheet: Material 3 colour roles, shapes and type, with glass surfaces for the
 * navigation and the controls. Each product picks its colours through <html data-product="...">.
 */

/* ---------- Colour roles ---------- */

/* Tools for Boox: monochrome, from its black launcher icon. */
:root {
    --primary: #1b1b1b;
    --on-primary: #ffffff;
    --primary-container: #e3e3e3;
    --on-primary-container: #1b1b1b;
    --tertiary: #5d5f5f;
    --tertiary-container: #dcdcdc;
    --surface: #f8f8f8;
    --surface-container-low: #f2f2f2;
    --surface-container: #ececec;
    --surface-container-high: #e6e6e6;
    --on-surface: #1b1b1b;
    --on-surface-variant: #474747;
    --outline: #777777;
    --outline-variant: #c6c6c6;
    --glow-1: rgba(0, 0, 0, 0.10);
    --glow-2: rgba(0, 0, 0, 0.06);
    --glass-fill: rgba(255, 255, 255, 0.62);
    --glass-edge: rgba(255, 255, 255, 0.75);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.10), 0 1px 2px rgba(0, 0, 0, 0.06);
    color-scheme: light;
}

/* Scribble Calendar: the green, peach and ink of its launcher icon. */
:root[data-product="scribble"] {
    --primary: #006c4f;
    --on-primary: #ffffff;
    --primary-container: #8ef7c8;
    --on-primary-container: #002115;
    --tertiary: #8e4d32;
    --tertiary-container: #ffdbcf;
    --surface: #f5fbf6;
    --surface-container-low: #eff5f0;
    --surface-container: #e9efea;
    --surface-container-high: #e3eae4;
    --on-surface: #171d1a;
    --on-surface-variant: #404944;
    --outline: #707974;
    --outline-variant: #bfc9c2;
    --glow-1: rgba(51, 204, 153, 0.30);
    --glow-2: rgba(255, 184, 154, 0.40);
}

@media (prefers-color-scheme: dark) {
    :root {
        --primary: #e3e3e3;
        --on-primary: #1b1b1b;
        --primary-container: #3b3b3b;
        --on-primary-container: #e3e3e3;
        --tertiary: #c6c6c6;
        --tertiary-container: #444444;
        --surface: #131313;
        --surface-container-low: #1b1b1b;
        --surface-container: #1f1f1f;
        --surface-container-high: #2a2a2a;
        --on-surface: #e3e3e3;
        --on-surface-variant: #c6c6c6;
        --outline: #919191;
        --outline-variant: #474747;
        --glow-1: rgba(255, 255, 255, 0.07);
        --glow-2: rgba(255, 255, 255, 0.04);
        --glass-fill: rgba(40, 40, 40, 0.55);
        --glass-edge: rgba(255, 255, 255, 0.12);
        --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.45), 0 1px 2px rgba(0, 0, 0, 0.30);
        color-scheme: dark;
    }

    :root[data-product="scribble"] {
        --primary: #72dbad;
        --on-primary: #003826;
        --primary-container: #005139;
        --on-primary-container: #8ef7c8;
        --tertiary: #ffb59a;
        --tertiary-container: #71361d;
        --surface: #0f1512;
        --surface-container-low: #171d1a;
        --surface-container: #1b211e;
        --surface-container-high: #252b28;
        --on-surface: #dee4df;
        --on-surface-variant: #bfc9c2;
        --outline: #89938d;
        --outline-variant: #404944;
        --glow-1: rgba(51, 204, 153, 0.18);
        --glow-2: rgba(255, 184, 154, 0.12);
        --glass-fill: rgba(27, 33, 30, 0.55);
    }
}

/* ---------- Base ---------- */

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

html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--on-surface);
    background-color: var(--surface);
    background-image:
            radial-gradient(48rem 32rem at 10% -10%, var(--glow-1), transparent 70%),
            radial-gradient(40rem 28rem at 95% 15%, var(--glow-2), transparent 70%),
            radial-gradient(36rem 30rem at 40% 110%, var(--glow-1), transparent 70%);
    background-attachment: fixed;
}

img, video, iframe, canvas {
    max-width: 100%;
}

img {
    height: auto;
}

a {
    color: var(--primary);
    text-underline-offset: 0.2em;
}

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

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

h1, h2, h3, h4, h5 {
    line-height: 1.25;
    margin: 1.6em 0 0.5em;
    font-weight: 600;
}

h1 {
    font-size: clamp(2rem, 1.4rem + 3vw, 3.5rem);
    letter-spacing: -0.02em;
    margin-top: 0;
}

h2 {
    font-size: clamp(1.5rem, 1.25rem + 1.2vw, 2rem);
}

h3 {
    font-size: 1.25rem;
}

h4, h5 {
    font-size: 1.05rem;
}

p, ul, ol {
    margin: 0 0 1em;
}

hr {
    border: 0;
    border-top: 1px solid var(--outline-variant);
    margin: 2rem 0;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

/* ---------- Glass ---------- */

.glass {
    background: var(--glass-fill);
    border: 1px solid var(--glass-edge);
    box-shadow: var(--glass-shadow);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    backdrop-filter: blur(24px) saturate(180%);
}

/* ---------- App bar ---------- */

.app-bar {
    position: sticky;
    top: 12px;
    z-index: 10;
    margin: 12px auto 0;
    width: min(1120px, calc(100% - 24px));
    border-radius: 999px;
    padding: 6px 8px 6px 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--on-surface);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.05rem;
    margin-right: auto;
    min-width: 0;
}

/* Both launcher icons are drawn in dark lines on a transparent ground, so they keep a white tile in dark mode. */
.brand img, .hero-icon {
    background: #ffffff;
}

.brand img {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    padding: 2px;
    flex: none;
}

.brand span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.nav-links {
    display: flex;
    gap: 4px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.nav-links a {
    display: inline-flex;
    align-items: center;
    min-height: 40px;
    padding: 0 16px;
    border-radius: 999px;
    color: var(--on-surface);
    text-decoration: none;
    font-weight: 500;
}

.nav-links a:hover {
    background: color-mix(in srgb, var(--on-surface) 8%, transparent);
}

.nav-links a[aria-current="page"] {
    background: var(--primary-container);
    color: var(--on-primary-container);
}

.menu {
    display: none;
    position: relative;
}

.menu > summary {
    list-style: none;
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    border-radius: 999px;
    cursor: pointer;
    color: var(--on-surface);
}

.menu > summary::-webkit-details-marker {
    display: none;
}

.menu > summary:hover {
    background: color-mix(in srgb, var(--on-surface) 8%, transparent);
}

.menu-panel {
    position: absolute;
    right: 0;
    top: calc(100% + 10px);
    min-width: 220px;
    border-radius: 24px;
    padding: 8px;
}

.menu-panel .nav-links {
    flex-direction: column;
}

.menu-panel .nav-links a {
    width: 100%;
}

@media (max-width: 720px) {
    .app-bar > .nav-links {
        display: none;
    }

    .menu {
        display: block;
    }
}

/* ---------- Layout ---------- */

main {
    flex: 1;
    width: min(1120px, 100%);
    margin: 0 auto;
    padding: 32px 16px 48px;
}

.prose {
    max-width: 46rem;
    margin: 0 auto;
}

.page-title {
    text-align: center;
    margin: 24px auto 32px;
    max-width: 46rem;
}

.page-title p {
    color: var(--on-surface-variant);
    font-size: 1.125rem;
}

.card {
    background: var(--surface-container-low);
    border: 1px solid var(--outline-variant);
    border-radius: 28px;
    padding: 24px;
}

.card > :first-child {
    margin-top: 0;
}

.card > :last-child {
    margin-bottom: 0;
}

.stack > * + * {
    margin-top: 16px;
}

/* ---------- Hero ---------- */

.hero {
    text-align: center;
    padding: 32px 0 16px;
}

.hero-icon {
    width: 96px;
    height: 96px;
    border-radius: 24px;
    padding: 6px;
    margin-bottom: 16px;
    box-shadow: var(--glass-shadow);
}

.hero .tagline {
    font-size: clamp(1.125rem, 1rem + 0.6vw, 1.4rem);
    color: var(--on-surface-variant);
    max-width: 40rem;
    margin: 0 auto 24px;
}

.store-badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin: 0;
}

/* Google Play's badge carries a transparent margin and Apple's has none, so the heights differ. */
.store-badges .badge-play {
    height: 72px;
}

.store-badges .badge-apple {
    height: 48px;
    margin: 12px;
}

.beta {
    font-size: 0.875rem;
    color: var(--on-surface-variant);
    max-width: 40rem;
    margin: 16px auto 0;
}

.lead {
    font-size: 1.2rem;
    max-width: 44rem;
    margin: 40px auto;
    text-align: center;
}

.media {
    border-radius: 28px;
    overflow: hidden;
    margin: 32px auto;
    max-width: 960px;
    box-shadow: var(--glass-shadow);
}

.media-video {
    position: relative;
    aspect-ratio: 16 / 9;
}

.media-video iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.media-screenshot {
    max-width: 420px;
}

.media-screenshot img {
    display: block;
    width: 100%;
}

/* ---------- Features ---------- */

.features {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    margin: 32px 0;
    padding: 0;
    list-style: none;
}

@media (max-width: 900px) {
    .features {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 600px) {
    .features {
        grid-template-columns: 1fr;
    }
}

.feature h3 {
    margin: 12px 0 6px;
}

.feature p {
    margin: 0;
    color: var(--on-surface-variant);
}

.icon-chip {
    display: inline-grid;
    place-items: center;
    width: 48px;
    height: 48px;
    border-radius: 16px;
    background: var(--primary-container);
    color: var(--on-primary-container);
}

.icon-chip svg {
    width: 24px;
    height: 24px;
    fill: currentColor;
}

/* ---------- Plan, focus, reflect ---------- */

.eyebrow {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--primary);
    margin: 0 0 8px;
}

.slogan {
    font-size: clamp(1.25rem, 1.05rem + 1vw, 1.75rem);
    font-weight: 600;
    margin: 0 auto 12px;
}

.flow {
    margin: 48px 0;
}

.flow-title {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 4px 16px;
    margin: 0 0 24px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.flow-arrow {
    color: var(--tertiary);
}

/* ---------- Buttons ---------- */

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 44px;
    padding: 0 24px;
    border: 0;
    border-radius: 999px;
    font: inherit;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    background: var(--primary);
    color: var(--on-primary);
    transition: box-shadow 0.2s, filter 0.2s;
}

.button:hover {
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    filter: brightness(1.08);
}

.button.tonal {
    background: var(--primary-container);
    color: var(--on-primary-container);
}

/* ---------- Public note of the day ---------- */

.live-note {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 260px);
    gap: 24px;
    align-items: center;
    max-width: 760px;
    margin: 40px auto;
}

.live-note canvas {
    display: block;
    width: 100%;
    aspect-ratio: 702 / 936;
    border-radius: 16px;
    border: 1px solid var(--outline-variant);
    background: #ffffff;
}

.live-dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #d93025;
    margin-right: 8px;
}

@media (max-width: 560px) {
    .live-note {
        grid-template-columns: 1fr;
    }

    .live-note canvas {
        max-width: 260px;
        margin: 0 auto;
    }
}

/* ---------- Changelog ---------- */

.release {
    margin-bottom: 16px;
}

.release header {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 4px 12px;
    margin-bottom: 8px;
}

.release h2 {
    margin: 0;
    font-size: 1.4rem;
}

.release time {
    color: var(--on-surface-variant);
}

.release h3 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--on-surface-variant);
    margin: 16px 0 4px;
}

.release ul {
    padding-left: 1.2em;
    margin: 0;
}

.chip {
    display: inline-flex;
    align-items: center;
    min-height: 28px;
    padding: 0 12px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    background: var(--tertiary-container);
    color: var(--on-surface);
}

/* ---------- FAQ ---------- */

details.faq {
    background: var(--surface-container-low);
    border: 1px solid var(--outline-variant);
    border-radius: 20px;
    margin-bottom: 8px;
    padding: 0 20px;
}

details.faq > summary {
    cursor: pointer;
    font-weight: 600;
    padding: 16px 0;
    list-style-position: outside;
}

details.faq > .answer {
    padding-bottom: 8px;
}

/* ---------- Tutorial steps ---------- */

.steps {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 16px;
}

.steps img {
    display: block;
    max-width: min(100%, 420px);
    margin: 16px auto 0;
    border-radius: 16px;
    border: 1px solid var(--outline-variant);
}

/* ---------- Forms ---------- */

.field {
    display: block;
    margin-bottom: 16px;
}

.field span {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 4px;
    color: var(--on-surface-variant);
}

.field input {
    width: 100%;
    min-height: 52px;
    padding: 0 16px;
    font: inherit;
    color: var(--on-surface);
    background: var(--surface);
    border: 1px solid var(--outline);
    border-radius: 12px;
}

.field input:focus {
    outline: none;
    border: 2px solid var(--primary);
    padding: 0 15px;
}

.field-error {
    color: #ba1a1a;
    font-size: 0.85rem;
    margin: -8px 0 16px;
}

.field-error-box, .field-message-box {
    border-radius: 12px;
    padding: 12px 16px;
}

.field-error-box {
    background: #ffdad6;
    color: #410002;
}

.field-message-box {
    background: var(--primary-container);
    color: var(--on-primary-container);
}

form .button + .button {
    margin-left: 8px;
}

.button.danger {
    background: #ba1a1a;
    color: #ffffff;
}

/* ---------- Footer ---------- */

.site-footer {
    margin-top: auto;
    background: var(--surface-container);
    border-top: 1px solid var(--outline-variant);
    padding: 40px 16px 24px;
    font-size: 0.95rem;
}

.footer-inner {
    width: min(1120px, 100%);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
}

.site-footer h2 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--on-surface-variant);
    margin: 0 0 8px;
}

.site-footer ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.site-footer li a {
    display: inline-block;
    padding: 4px 0;
    color: var(--on-surface);
    text-decoration: none;
}

.site-footer li a:hover {
    text-decoration: underline;
}

.copyright {
    width: min(1120px, 100%);
    margin: 32px auto 0;
    padding-top: 16px;
    border-top: 1px solid var(--outline-variant);
    color: var(--on-surface-variant);
}

.copyright a {
    color: inherit;
}

/* ---------- Error pages ---------- */

.error-page {
    text-align: center;
    padding: 48px 0;
}

.error-page .code {
    font-size: clamp(4rem, 3rem + 6vw, 8rem);
    font-weight: 700;
    line-height: 1;
    color: var(--primary);
    margin: 0 0 8px;
}

/* ---------- Fallbacks ---------- */

/* Without a backdrop blur, a translucent bar would show the page through it unblurred. */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
    .glass {
        background: var(--surface-container-high);
    }
}

@media (prefers-reduced-transparency: reduce) {
    .glass {
        background: var(--surface-container-high);
        -webkit-backdrop-filter: none;
        backdrop-filter: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        transition: none !important;
        animation: none !important;
    }
}

/* E-ink: no blur, no gradients, no shadows - flat surfaces with clear edges repaint cleanly. */
@media (update: slow), (monochrome) {
    body {
        background-image: none;
        background-color: #ffffff;
    }

    .glass {
        background: #ffffff;
        border: 1px solid #000000;
        box-shadow: none;
        -webkit-backdrop-filter: none;
        backdrop-filter: none;
    }

    .card, details.faq, .media, .site-footer {
        box-shadow: none;
        border-color: #000000;
    }

    .button:hover {
        box-shadow: none;
        filter: none;
    }
}