/* Bifrost — shared design system (header, footer, base styles, buttons) */

:root {
    --bg: #eff1f5;
    --bg-soft: #e6e9ef;
    --surface: #ffffff;
    --ink: #1e1e2e;
    --muted: #5c5f77;
    --line: rgba(30, 30, 46, 0.12);
    --lavender: #7287fd;
    --lavender-strong: #5a6fe0;
    --sapphire: #209fb5;
    --teal: #179299;
    --peach: #fe640b;
    --mauve: #8839ef;
    --header-bg: #1e1e2e;
    --header-ink: #eff1f5;
    --radius: 10px;
}

* {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: 'Roboto', Arial, sans-serif;
    color: var(--ink);
    background: var(--bg);
    display: flex;
    flex-direction: column;
}

img {
    max-width: 100%;
}

.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* --- Shared header --- */

.site-header {
    background: var(--header-bg);
    color: var(--header-ink);
}

.site-header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: inherit;
}

.brand-logo {
    width: 36px;
    height: 36px;
    display: block;
    flex-shrink: 0;
}

.brand-name {
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: 0.02em;
}

.site-nav {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.site-nav a {
    color: rgba(239, 241, 245, 0.82);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 8px 12px;
    border-radius: 6px;
    transition: background 0.15s ease, color 0.15s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
    background: rgba(239, 241, 245, 0.12);
    color: #ffffff;
}

.site-nav a[aria-current="page"] {
    background: rgba(239, 241, 245, 0.16);
    color: #ffffff;
}

/* --- Shared footer --- */

.site-footer {
    margin-top: auto;
    padding: 28px 20px;
    text-align: center;
    color: var(--muted);
    font-size: 0.9rem;
}

/* --- Buttons --- */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0 20px;
    border-radius: 8px;
    font-weight: 700;
    text-decoration: none;
    border: 1px solid transparent;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
    background: var(--lavender);
    color: #ffffff;
    box-shadow: 0 8px 20px rgba(114, 135, 253, 0.28);
}

.btn-primary:hover,
.btn-primary:focus-visible {
    background: var(--lavender-strong);
    transform: translateY(-2px);
    box-shadow: 0 12px 26px rgba(114, 135, 253, 0.32);
}

.btn-ghost {
    background: var(--surface);
    color: var(--ink);
    border-color: var(--line);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
    border-color: var(--lavender);
    color: var(--lavender-strong);
}

@media (max-width: 600px) {
    .site-header-inner {
        padding: 12px 16px;
    }

    .site-nav {
        gap: 2px;
    }

    .site-nav a {
        padding: 7px 10px;
        font-size: 0.9rem;
    }
}