/* ============================================
   poroCity — Layout (Header, Nav, Footer, Grid)
   ============================================ */

/* ---- Header ---- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--color-heading);
    border-bottom: none;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-md);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.header-social {
    display: flex;
    gap: var(--space-sm);
    align-items: center;
}

.header-social a {
    color: rgba(255, 255, 255, 0.7);
    display: flex;
    align-items: center;
    transition: color var(--transition-fast);
}

.header-social a:hover {
    color: var(--color-white);
}

.header-logo {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    text-decoration: none;
    gap: 0;
}

.header-logo__title {
    font-weight: var(--font-weight-bold);
    font-size: 1.3rem;
    color: var(--color-white);
    line-height: 1;
    letter-spacing: -0.02em;
}

.header-logo__sub {
    font-weight: var(--font-weight-light);
    font-size: 0.6rem;
    color: rgba(255, 255, 255, 0.7);
    letter-spacing: 0.1em;
    line-height: 1;
    margin-top: 2px;
}

/* ---- Desktop Nav ---- */
.nav-links {
    display: flex;
    gap: var(--space-md);
    list-style: none;
}

.nav-links a {
    font-weight: var(--font-weight-bold);
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    padding-bottom: 4px;
    border-bottom: 2px solid transparent;
    transition: color var(--transition-fast), border-color var(--transition-fast);
}

.nav-links a:hover {
    color: var(--color-white);
}

.nav-links a.active {
    color: var(--color-white);
    border-bottom-color: var(--color-accent);
}

/* ---- Hamburger (mobile) ---- */
.nav-hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 32px;
    height: 32px;
    position: relative;
    z-index: 200;
}

.nav-hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-white);
    position: absolute;
    left: 5px;
    transition: transform var(--transition-base), opacity var(--transition-fast);
}

.nav-hamburger span:nth-child(1) { top: 9px; }
.nav-hamburger span:nth-child(2) { top: 15px; }
.nav-hamburger span:nth-child(3) { top: 21px; }

/* Hamburger open state */
.nav-hamburger.open span:nth-child(1) {
    top: 15px;
    transform: rotate(45deg);
}
.nav-hamburger.open span:nth-child(2) {
    opacity: 0;
}
.nav-hamburger.open span:nth-child(3) {
    top: 15px;
    transform: rotate(-45deg);
}

/* ---- Mobile Nav Overlay ---- */
.nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-ivory);
    z-index: 150;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.nav-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

.nav-overlay a {
    font-weight: var(--font-weight-bold);
    font-size: 1.5rem;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: -0.01em;
    transition: color var(--transition-fast);
}

.nav-overlay a:hover,
.nav-overlay a.active {
    color: var(--color-accent);
}

/* ---- Main content ---- */
.site-main {
    padding-top: 0;
}

/* ---- Sections ---- */
.section {
    padding: var(--space-xl) 0;
}

.section--compact {
    padding: var(--space-lg) 0;
}

/* ---- Grid helpers ---- */
.grid {
    display: grid;
    gap: var(--space-md);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--5 { grid-template-columns: repeat(5, 1fr); }

/* ---- Footer ---- */
.site-footer {
    background: var(--color-footer-bg);
    color: var(--color-ivory);
    padding: var(--space-lg) 0;
}

.footer-inner {
    max-width: var(--content-max);
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    text-align: center;
}

.footer-title {
    font-weight: var(--font-weight-bold);
    font-size: 1.5rem;
    color: var(--color-ivory);
    letter-spacing: -0.02em;
}

.footer-info {
    font-weight: var(--font-weight-light);
    font-size: 0.8rem;
    color: var(--color-grey);
    line-height: 1.8;
}

.footer-links {
    display: flex;
    gap: var(--space-sm);
}

.footer-links a {
    font-size: 0.75rem;
    color: var(--color-grey);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-accent);
}

.footer-logo {
    display: block;
    margin-bottom: var(--space-sm);
}

.footer-logo__img {
    height: 28px;
    width: auto;
    opacity: 0.8;
    transition: opacity var(--transition-fast), filter var(--transition-fast);
}

.footer-logo:hover .footer-logo__img {
    opacity: 1;
    filter: brightness(0) saturate(100%) invert(68%) sepia(30%) saturate(1000%) hue-rotate(340deg) brightness(100%) contrast(100%);
}

.footer-title-link {
    font-weight: var(--font-weight-bold);
    font-size: 1.5rem;
    color: var(--color-ivory);
    letter-spacing: -0.02em;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-title-link:hover {
    color: var(--color-accent);
}

.footer-social {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-xs);
}

.footer-social a {
    color: var(--color-grey);
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
}

.footer-social a:hover {
    color: var(--color-accent);
}

.footer-copy {
    font-size: 0.7rem;
    color: var(--color-grey);
    opacity: 0.6;
    margin-top: var(--space-xs);
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .header-right { display: none; }
    .nav-hamburger { display: block; }

    .grid--2,
    .grid--3,
    .grid--4,
    .grid--5 {
        grid-template-columns: 1fr;
    }

    .section {
        padding: var(--space-lg) 0;
    }

    .container {
        padding: 0 var(--space-sm);
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .grid--4 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid--5 {
        grid-template-columns: repeat(2, 1fr);
    }
}