.splash { max-width: 720px; margin: 0 auto; padding: 3rem 1.5rem 4rem; }
@media (max-width: 520px) { .splash { padding: 2rem 1.25rem 3rem; } }
.masthead { animation: rise 0.6s ease-out both; }
@keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
.masthead h1 { font-family: 'Fraunces', serif; font-weight: 500; font-size: clamp(2.6rem, 8vw, 3.6rem); letter-spacing: -0.01em; margin: 0; }
.masthead .tagline { font-family: 'Fraunces', serif; font-style: italic; font-weight: 400; font-size: 1.1rem; color: var(--ink-soft); margin: 0.35rem 0 0; }
.splash .rule { border: none; border-top: 1px solid var(--rule); margin: 1.6rem 0 2.6rem; }
.splash .status { font-size: 0.8rem; letter-spacing: 0.02em; color: var(--muted); margin: 0 0 2.6rem; }
.splash .status .dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); margin-right: 0.5em; animation: pulse 2s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }

/* Heartbeat banner — flashing blue "Now accepting submissions" */
.heartbeat-banner {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    background: rgba(47, 92, 255, 0.08);
    border: 1px solid rgba(47, 92, 255, 0.3);
    color: #2F5CFF;
    font-family: 'IBM Plex Sans', sans-serif;
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 0.02em;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    margin-bottom: 2rem;
    animation: heartbeat-flash 2s ease-in-out infinite;
}
.heartbeat-dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #2F5CFF;
    animation: heartbeat-pulse 1.2s ease-in-out infinite;
    flex-shrink: 0;
}
@keyframes heartbeat-pulse {
    0%, 100% { transform: scale(1); opacity: 1; box-shadow: 0 0 0 0 rgba(47, 92, 255, 0.5); }
    50% { transform: scale(1.3); opacity: 0.7; box-shadow: 0 0 0 6px rgba(47, 92, 255, 0); }
}
@keyframes heartbeat-flash {
    0%, 100% { background: rgba(47, 92, 255, 0.08); border-color: rgba(47, 92, 255, 0.3); }
    50% { background: rgba(47, 92, 255, 0.16); border-color: rgba(47, 92, 255, 0.5); }
}
@media (prefers-reduced-motion: reduce) {
    .heartbeat-banner, .heartbeat-dot { animation: none; }
}
.splash p { font-size: 1.02rem; color: var(--ink); max-width: 34em; }
.splash .paper-card p { max-width: none; }
.splash .paper-card h2 { font-size: 1.15rem; margin: 0 0 0.4rem; line-height: 1.3; }
.copy-block { position: relative; margin: 1.2rem 0; max-width: 34em; }
.copy-block pre { background: var(--card); border: 1px solid var(--rule); border-radius: 6px; padding: 1rem 1.2rem; margin: 0; overflow-x: auto; }
.copy-block code { font-family: 'IBM Plex Mono', monospace; font-size: 0.88rem; color: var(--ink); white-space: pre-wrap; word-break: break-word; }
.copy-btn { position: absolute; top: 0.5rem; right: 0.5rem; background: var(--paper-warm); border: 1px solid var(--rule); border-radius: 4px; padding: 0.4rem; color: var(--ink-soft); cursor: pointer; transition: all 0.15s ease; display: flex; align-items: center; justify-content: center; }
.copy-btn:hover { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }
.copy-btn svg { display: block; transition: opacity 0.2s ease; }
.copy-btn .icon-copy { opacity: 1; }
.copy-btn .icon-check { position: absolute; opacity: 0; color: #2D7A3E; }
.copy-btn.copied .icon-copy { opacity: 0; }
.copy-btn.copied .icon-check { opacity: 1; }
.splash h2 { font-family: 'Fraunces', serif; font-weight: 500; font-size: 1.3rem; margin: 2.8rem 0 0.6rem; }
.splash h3 { font-family: 'IBM Plex Sans', sans-serif; font-weight: 600; font-size: 0.95rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); margin: 2.6rem 0 1rem; }
.subjects { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 1rem 0 0; }
.standards { margin: 1rem 0; padding: 0; }
.standards li { font-size: 0.95rem; color: var(--ink); padding: 0.5rem 0 0.5rem 1.6rem; position: relative; list-style: none; }
.standards li::before { content: "\2192"; position: absolute; left: 0; color: var(--accent); font-weight: 600; }
.splash form { margin-top: 1.2rem; }
.splash label.field-label { display: block; font-size: 0.92rem; color: var(--ink-soft); margin-bottom: 0.5rem; }
.splash input[type="email"] { width: 100%; font-family: 'IBM Plex Sans', sans-serif; font-size: 1rem; padding: 0.75rem 0.85rem; border: 1px solid var(--rule); background: #fff; color: var(--ink); border-radius: 3px; }
.splash input[type="email"]:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.checkbox-row { display: flex; align-items: flex-start; gap: 0.6rem; margin-top: 1rem; }
.checkbox-row input[type="checkbox"] { margin-top: 0.2rem; width: 16px; height: 16px; accent-color: var(--accent); flex-shrink: 0; }
.checkbox-row label { font-size: 0.95rem; color: var(--ink); }
.splash button[type="submit"] { margin-top: 1.4rem; font-family: 'IBM Plex Sans', sans-serif; font-weight: 500; font-size: 0.95rem; background: var(--ink); color: var(--paper); border: none; padding: 0.75rem 1.5rem; border-radius: 3px; cursor: pointer; transition: background 0.15s ease; }
.splash button[type="submit"]:hover { background: var(--accent); }
.splash button[type="submit"]:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.confirm { display: none; margin-top: 1rem; padding: 0.85rem 1rem; background: var(--accent-soft); border-left: 3px solid var(--accent); font-size: 0.92rem; color: var(--ink); }
.confirm.error { background: #FDE8E8; border-left-color: #C53030; }
.support { margin-top: 2.6rem; padding-top: 1.8rem; border-top: 1px solid var(--rule); }
.support p { color: var(--ink-soft); font-size: 0.96rem; }
.support-links { display: flex; flex-wrap: wrap; gap: 1.2rem; margin-top: 0.8rem; }
.support-link { display: inline-block; font-size: 0.95rem; font-weight: 500; color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent); padding-bottom: 1px; }
.support-link:hover { color: var(--ink); border-color: var(--ink); }
.github-link { margin-top: 1.6rem; font-size: 0.9rem; color: var(--muted); }
.github-link a { color: var(--ink-soft); text-decoration: none; border-bottom: 1px solid var(--rule); }
.github-link a:hover { color: var(--accent); border-color: var(--accent); }
.splash footer { margin-top: 3.5rem; font-size: 0.8rem; color: var(--muted); }