/* ============================================================
   OBRINJA PROGRAMMINGS — Header Styles
   Merge into assets/css/styles.css
   ============================================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
    --op-bg:           #0a0a0f;
    --op-surface:      rgba(14, 14, 22, 0.92);
    --op-border:       rgba(90, 120, 255, 0.13);
    --op-blue:         #4f8ef7;
    --op-purple:       #8b5cf6;
    --op-gradient:     linear-gradient(135deg, var(--op-blue), var(--op-purple));
    --op-text:         #ffffff;
    --op-text-muted:   rgba(255, 255, 255, 0.52);
    --op-nav-hover-bg: rgba(255, 255, 255, 0.055);
    --header-height:   70px;
    --header-z:        100;
}

/* ---------- Header Shell ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: var(--header-z);
    background: var(--op-surface);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--op-border);
    transition: background 0.3s ease, border-color 0.3s ease;
}

.site-header.scrolled {
    background: rgba(10, 10, 15, 0.97);
    border-color: rgba(90, 120, 255, 0.22);
}

/* Gradient glow line at bottom of header */
.header-accent-line {
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(
            90deg,
            transparent 0%,
            rgba(79, 142, 247, 0.5) 35%,
            rgba(139, 92, 246, 0.5) 65%,
            transparent 100%
    );
    pointer-events: none;
}

/* ---------- Inner Layout ---------- */
.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

/* ---------- Logo ---------- */
.logo-area {
    display: flex;
    align-items: center;
    gap: 11px;
    text-decoration: none;
    flex-shrink: 0;
}

/* The actual logo image — circular crop, no black box showing */
.logo-img {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    object-fit: cover;
    object-position: center;
    display: block;
    flex-shrink: 0;
    transition: opacity 0.2s ease;
}

.logo-area:hover .logo-img {
    opacity: 0.85;
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1;
    gap: 4px;
}

.logo-brand {
    font-family: 'Syne', sans-serif;
    font-size: 15px;
    font-weight: 700;
    color: var(--op-text);
    letter-spacing: 0.03em;
}

.logo-brand-accent {
    background: var(--op-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-tagline {
    font-family: 'DM Sans', sans-serif;
    font-size: 9px;
    font-weight: 500;
    color: var(--op-text-muted);
    letter-spacing: 0.28em;
    text-transform: uppercase;
}

/* ---------- Navigation ---------- */
.site-nav {
    display: flex;
    align-items: center;
    gap: 2px;
}

.site-nav a {
    font-family: 'DM Sans', sans-serif;
    font-size: 13.5px;
    font-weight: 500;
    color: var(--op-text-muted);
    text-decoration: none;
    padding: 7px 13px;
    border-radius: 7px;
    transition: color 0.2s ease, background 0.2s ease;
    letter-spacing: 0.01em;
    white-space: nowrap;
}

.site-nav a:hover {
    color: var(--op-text);
    background: var(--op-nav-hover-bg);
}

.site-nav a.active {
    color: var(--op-text);
    background: rgba(79, 142, 247, 0.12);
}

/* Kontakt — gradient CTA button */
.site-nav a.nav-cta {
    background: var(--op-gradient);
    color: #fff !important;
    padding: 8px 20px;
    border-radius: 8px;
    font-weight: 600;
    margin-left: 10px;
    transition: opacity 0.2s ease, transform 0.15s ease;
}

.site-nav a.nav-cta:hover {
    opacity: 0.88;
    transform: translateY(-1px);
    background: var(--op-gradient);
}

.site-nav a.nav-cta:active {
    transform: translateY(0);
}

/* ---------- Hamburger (mobile) ---------- */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 6px;
    border-radius: 6px;
    transition: background 0.2s;
}

.hamburger:hover {
    background: var(--op-nav-hover-bg);
}

.hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: rgba(255, 255, 255, 0.75);
    border-radius: 2px;
    transition: transform 0.25s ease, opacity 0.25s ease;
}

/* Open state */
.hamburger[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.hamburger[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}
.hamburger[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Mobile Nav ---------- */
@media (max-width: 860px) {
    .hamburger {
        display: flex;
    }

    .site-nav {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        background: rgba(10, 10, 15, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--op-border);
        padding: 0.75rem 1.5rem 1rem;
    }

    .site-nav.open {
        display: flex;
    }

    .site-nav a {
        padding: 11px 12px;
        border-radius: 8px;
        font-size: 14.5px;
    }

    .site-nav a.nav-cta {
        margin: 0.5rem 0 0;
        text-align: center;
        padding: 11px 20px;
    }
}

@media (max-width: 400px) {
    .header-inner {
        padding: 0 1.25rem;
    }

    .logo-brand {
        font-size: 13px;
    }

    .logo-tagline {
        display: none;
    }
}