:root {
    --pulse-max-width: 840px;
}

#pulseApp {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
    background: var(--bg-primary);
}

#pulseApp .header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--app-header-height);
    z-index: 100;
}

.pulse-main {
    flex: 1;
    margin-top: 0;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
}

.pulse-center {
    width: min(var(--pulse-max-width), 100%);
    margin: 0 auto;
    text-align: center;
}

.pulse-greeting-text {
    color: var(--text-secondary);
    font-size: clamp(1.3rem, 2.4vw, 2rem);
    line-height: 1.45;
    min-height: 1.45em;
    margin: 0;
}

.pulse-greeting-text.ai-typing {
    min-height: 1.45em;
}

.pulse-greeting-category-label {
    margin-top: 0.9rem;
    min-height: 1em;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    opacity: 0;
    transform: translateY(2px);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.pulse-greeting-category-label.visible {
    opacity: 0.9;
    transform: translateY(0);
}

.pulse-greeting-text .ai-caret {
    display: inline;
    font-weight: 300;
    color: var(--text-muted);
    animation: caretPulse 0.8s steps(2) infinite;
}

.pulse-greeting-text .ai-thinking-dots {
    display: inline;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    animation: dotsPulse 1.8s ease-in-out infinite;
}

@media (max-width: 768px) {
    .pulse-main {
        padding: var(--space-md);
    }

    .pulse-greeting-text {
        font-size: clamp(1.05rem, 4.7vw, 1.4rem);
    }
}