/* AIRI brand tokens -- sourced from Sentinelv2/docs/design-system/colors_and_type.css */
:root {
    --airi-brand-navy:      #0b1f33;
    --airi-brand-navy-700:  #0a1c2e;
    --airi-brand-navy-800:  #050f1c;
    --airi-brand-accent:    #6bdbcb;
    --airi-text-inverse:    #f8f9fa;
    --airi-text-on-dark:    #c8d3e0;
    --airi-font-sans:       -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --airi-radius-pill:     999px;
    --airi-shadow-md:       0 4px 8px rgba(15, 23, 42, 0.08), 0 2px 4px rgba(15, 23, 42, 0.06);
}

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

html, body {
    height: 100%;
}

body {
    font-family: var(--airi-font-sans);
    background: linear-gradient(160deg, var(--airi-brand-navy) 0%, var(--airi-brand-navy-800) 100%);
    color: var(--airi-text-inverse);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* -- Header (Login button top-right) -- */

.site-header {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    display: flex;
    justify-content: flex-end;
    padding: 20px 28px;
    z-index: 10;
}

.login-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    min-width: 96px;
    padding: 0 24px;
    background: var(--airi-brand-accent);
    color: var(--airi-brand-navy);
    border: 1.5px solid var(--airi-brand-accent);
    border-radius: var(--airi-radius-pill);
    font-family: var(--airi-font-sans);
    font-size: 0.9375rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    text-decoration: none;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease;
}

.login-btn:hover {
    background: #88ece0;
    border-color: #88ece0;
    color: var(--airi-brand-navy);
}

.login-btn:focus-visible {
    outline: 2px solid var(--airi-brand-accent);
    outline-offset: 3px;
}

/* -- Main content (centered) -- */

.site-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 80px 24px 40px;
    gap: 44px;
}

.logo {
    width: min(360px, 88vw);
    height: auto;
    user-select: none;
    -webkit-user-drag: none;
}

h1 {
    font-size: clamp(0.75rem, 1.5vw, 0.9375rem);
    font-weight: 500;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--airi-text-on-dark);
    line-height: 1.15;
}

/* -- Responsive -- */

@media (max-width: 480px) {
    .site-header {
        padding: 16px 20px;
    }

    .logo {
        width: min(300px, 88vw);
    }
}

/* -- Reduced motion -- */

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