:root {
    color-scheme: light dark;
    --startup-bg: #f5f7fb;
    --startup-surface: rgba(255, 255, 255, 0.82);
    --startup-border: rgba(15, 23, 42, 0.08);
    --startup-shadow: 0 24px 60px rgba(15, 23, 42, 0.14);
    --startup-text: #18212f;
    --startup-muted: #5a6678;
    --startup-accent: #ec9239;
    --startup-backdrop: radial-gradient(circle at top, rgba(236, 146, 57, 0.16), transparent 34%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(242, 245, 250, 0.98));
}

@media (prefers-color-scheme: dark) {
    :root {
        --startup-bg: #09111d;
        --startup-surface: rgba(9, 17, 29, 0.78);
        --startup-border: rgba(255, 255, 255, 0.08);
        --startup-shadow: 0 28px 72px rgba(0, 0, 0, 0.42);
        --startup-text: #f5f7fb;
        --startup-muted: #cdd6e3;
        --startup-backdrop: radial-gradient(circle at top, rgba(236, 146, 57, 0.18), transparent 30%),
        linear-gradient(180deg, rgba(6, 11, 20, 0.96), rgba(9, 17, 29, 0.98));
    }
}

html,
body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

body {
    background: var(--startup-bg);
    color: var(--startup-text);
    font-family: "Inter", "SF Pro Display", "Segoe UI", sans-serif;
}

#compose-root {
    position: fixed;
    inset: 0;
}

.startup-body {
    min-height: 100vh;
}

.startup-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: grid;
    place-items: center;
    padding: clamp(1.5rem, 4vw, 3rem);
    background: var(--startup-backdrop);
    opacity: 1;
    visibility: visible;
    transition: opacity 220ms ease, visibility 220ms ease;
}

.startup-overlay[hidden],
.startup-overlay[data-state="ready"] {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.startup-screen {
    width: min(100%, 28rem);
}

.startup-panel {
    display: grid;
    justify-items: center;
    gap: 1rem;
    padding: clamp(1.75rem, 5vw, 2.5rem);
    text-align: center;
    border: 1px solid var(--startup-border);
    border-radius: 1.5rem;
    background: var(--startup-surface);
    box-shadow: var(--startup-shadow);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

.startup-panel--error {
    gap: 0.75rem;
}

.startup-logo {
    width: clamp(4.5rem, 10vw, 6rem);
    height: auto;
    aspect-ratio: 1;
    object-fit: contain;
}

.startup-title {
    margin: 0;
    max-width: 22rem;
    font-size: clamp(1rem, 2vw, 1.125rem);
    line-height: 1.5;
    font-weight: 600;
    color: var(--startup-text);
}

.startup-description {
    margin: -0.375rem 0 0;
    max-width: 22rem;
    font-size: clamp(0.9375rem, 1.8vw, 1rem);
    line-height: 1.5;
    font-weight: 500;
    color: var(--startup-muted);
}

@media (prefers-reduced-motion: reduce) {
    .startup-overlay {
        transition: none;
    }
}

@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
    .startup-panel {
        background: color-mix(in srgb, var(--startup-bg) 78%, white 22%);
    }
}