/* ── ZetrTheme color tokens ──────────────────────────────────────────────── */
:root {
    --color-primary:           #1F4D8C;
    --color-primary-container: #D7E4FF;
    --color-on-primary:        #FFFFFF;
    --color-secondary:         #17796C;
    --color-bg-top:            #C5D5EF;
    --color-bg-mid:            #F6F1E8;
    --color-bg-bot:            #C8E4DF;
    --color-surface:           #FFFFFF;
    --color-surface-variant:   #E4EBEF;
    --color-ink:               #14202B;
    --color-slate:             #566271;
    --color-outline:           #8899AA;
    --color-error:             #B3261E;
    --radius-card:             32px;
    --radius-btn:              100px;
    --shadow-card: 0 8px 40px rgba(31,77,140,.14), 0 2px 6px rgba(31,77,140,.08);
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-primary:           #6B8FD0;
        --color-primary-container: #0F2F57;
        --color-on-primary:        #FFFFFF;
        --color-secondary:         #7ED8CA;
        --color-bg-top:            #0D2140;
        --color-bg-mid:            #0E1C2A;
        --color-bg-bot:            #0A1E1B;
        --color-surface:           #1A2B3A;
        --color-surface-variant:   #25374A;
        --color-ink:               #E8F0F8;
        --color-slate:             #94AABF;
        --color-outline:           #4A6070;
        --color-error:             #F2B8B5;
        --shadow-card: 0 8px 40px rgba(0,0,0,.50), 0 2px 8px rgba(0,0,0,.30);
    }
}

/* ── Reset ───────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; }

/* ── Page layout ─────────────────────────────────────────────────────────── */
.page {
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 32px 20px;
    background: linear-gradient(
        155deg,
        var(--color-bg-top)  0%,
        var(--color-bg-mid) 52%,
        var(--color-bg-bot) 100%
    );
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-ink);
    -webkit-font-smoothing: antialiased;
}

/* ── Card ────────────────────────────────────────────────────────────────── */
.card {
    background: var(--color-surface);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    /* clamp: never wider than 400px, never narrower than 260px,
       always leaves at least 20px breathing room on each side */
    width: clamp(260px, calc(100vw - 40px), 400px);
    padding: 44px 32px 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* ── Wordmark ─────────────────────────────────────────────────────────────── */
.wordmark {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    margin-bottom: 28px;
}

.wordmark__icon {
    width: 72px;
    height: 72px;
    flex-shrink: 0;
    drop-shadow: 0 4px 16px rgba(31,77,140,.28);
}

.wordmark__name {
    font-size: 30px;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--color-primary);
}

/* ── Headline ─────────────────────────────────────────────────────────────── */
.headline {
    font-family: Georgia, "Times New Roman", serif;
    font-size: 21px;
    font-weight: 600;
    line-height: 1.35;
    color: var(--color-ink);
    text-align: center;
    margin-bottom: 24px;
}

.headline:empty { margin-bottom: 0; }

/* ── Notices ──────────────────────────────────────────────────────────────── */
.notice {
    width: 100%;
    font-size: 14px;
    line-height: 1.5;
    padding: 10px 16px;
    border-radius: 12px;
    text-align: center;
    margin-bottom: 20px;
}

.notice--error {
    background: color-mix(in srgb, var(--color-error) 10%, transparent);
    color: var(--color-error);
    border: 1px solid color-mix(in srgb, var(--color-error) 30%, transparent);
}

/* ── Actions ──────────────────────────────────────────────────────────────── */
.card__actions {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 15px 24px;
    border-radius: var(--radius-btn);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: opacity 0.15s, transform 0.1s;
    border: none;
    outline: none;
}
.btn:active { transform: scale(0.97); }

.btn--primary {
    background: var(--color-primary);
    color: var(--color-on-primary);
    box-shadow: 0 3px 10px rgba(31,77,140,.30);
}
.btn--primary:hover { opacity: 0.88; }

/* Outlined secondary — always readable on any surface */
.btn--secondary {
    background: transparent;
    color: var(--color-ink);
    border: 1.5px solid var(--color-outline);
}
.btn--secondary:hover { background: color-mix(in srgb, var(--color-ink) 6%, transparent); }

.btn__icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* ── Install button group ────────────────────────────────────────────────── */
.install-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 400px) {
    .card        { padding: 36px 20px 32px; }
    .wordmark    { margin-bottom: 22px; }
    .wordmark__icon { width: 60px; height: 60px; }
    .wordmark__name { font-size: 26px; }
    .headline    { font-size: 19px; margin-bottom: 20px; }
}