/* ==========================================
   Layout - Header, Footer, Navigation, Grids
   ========================================== */

/* --- Header & Navigation --- */
header {
    padding: var(--space-md) 0;
    position: fixed;
    width: 100%;
    z-index: var(--z-header);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    transition: padding var(--transition-fast), box-shadow var(--transition-fast);
}

header.scrolled {
    box-shadow: var(--shadow-sm);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    line-height: 1.1;
}

.logo-main {
    font-size: 1.8em;
    font-weight: 700;
    color: var(--color-secondary);
}

.logo-accent {
    color: var(--color-accent);
}

.logo-subtitle {
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--color-text-light);
    letter-spacing: 0.5px;
}

.nav-links {
    display: flex;
    align-items: center;
}

.nav-links ul {
    display: flex;
}

.nav-links ul li {
    margin: 0 var(--space-md);
}

.nav-links ul li a {
    color: var(--color-secondary);
    font-weight: 500;
    position: relative;
    padding-bottom: var(--space-xs);
}

.nav-links ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-fast);
}

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

.nav-links ul li a:hover::after,
.nav-links ul li a.active::after {
    width: 100%;
}

/* Language Switcher */
.lang-switcher {
    margin-left: var(--space-lg);
}

.lang-select {
    background-color: transparent;
    border: 1px solid var(--color-border);
    padding: 8px 25px 8px 12px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-family: var(--font-family);
    font-weight: 500;
    color: var(--color-secondary);
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23333' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 8px center;
    background-size: 1em;
    transition: border-color var(--transition-fast);
}

.lang-select:hover {
    border-color: var(--color-accent);
}

/* Hamburger */
.hamburger {
    display: none;
    font-size: 1.5rem;
    background: none;
    border: none;
    color: var(--color-secondary);
    cursor: pointer;
    z-index: var(--z-hamburger);
}

/* --- Grids --- */
.services-grid,
.why-us-grid,
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: start;
}

/* --- Footer --- */
footer {
    padding: var(--space-3xl) 0;
    background-color: var(--color-footer-bg);
    color: var(--color-footer-text);
}

.footer-grid {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-2xl);
}

.footer-about,
.footer-contact {
    flex: 1;
    min-width: 300px;
}

.footer-about h3,
.footer-contact h3 {
    font-size: var(--font-size-2xl);
    color: var(--color-footer-text);
    margin-bottom: var(--space-lg);
    line-height: var(--line-height-tight);
}

.footer-about p,
.footer-contact p {
    font-size: var(--font-size-md);
    line-height: var(--line-height-relaxed);
    color: var(--color-footer-text);
}

.phone-number {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-primary);
    margin-top: var(--space-md);
}

.copyright {
    text-align: center;
    margin-top: 50px;
    padding-top: var(--space-lg);
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* --- Floating Buttons --- */
.float-btn {
    position: fixed;
    right: 30px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2rem;
    color: white;
    text-decoration: none;
    box-shadow: var(--shadow-float);
    transition: transform var(--transition-fast);
    z-index: var(--z-float);
}

.float-btn:hover {
    transform: scale(1.1);
    color: white;
}

.whatsapp-btn {
    bottom: 30px;
    background-color: var(--color-whatsapp);
}

.instagram-btn {
    bottom: 100px;
    background-color: var(--color-instagram);
}