/**
 * BEGRES Professional Navbar
 * Fully responsive with scroll behavior
 */

:root {
    --nav-height: 80px;
    --nav-height-scrolled: 64px;
    --nav-bg: rgba(15, 23, 42, 0.92);
    --nav-bg-solid: #0f172a;
    --nav-border: rgba(255, 255, 255, 0.08);
    --nav-text: rgba(255, 255, 255, 0.9);
    --nav-text-hover: #ffffff;
    --nav-accent: #38bdf8;
    --nav-primary: #1e67b9;
    --nav-dropdown-bg: rgba(15, 23, 42, 0.98);
    --nav-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
    --nav-transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    padding-top: var(--nav-height);
    transition: padding-top 0.35s ease;
}

body.nav-scrolled {
    padding-top: var(--nav-height-scrolled);
}

/* ===== Navbar Container ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: var(--nav-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--nav-border);
    z-index: 1000;
    transition: var(--nav-transition);
    display: flex;
    align-items: center;
}

.navbar.scrolled {
    height: var(--nav-height-scrolled);
    background: var(--nav-bg-solid);
    box-shadow: var(--nav-shadow);
}

.navbar.hidden {
    transform: translateY(-100%);
}

.nav-container {
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* ===== Logo ===== */
.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    flex-shrink: 0;
}

.nav-logo img {
    height: 38px;
    width: auto;
    transition: var(--nav-transition);
    filter: brightness(0) invert(1);
    opacity: 0.95;
}

.navbar.scrolled .nav-logo img {
    height: 32px;
}

.nav-logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: 0.5px;
    display: none;
}

@media (min-width: 769px) {
    .nav-logo-text { display: block; }
}

/* ===== Desktop Navigation ===== */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-menu li {
    position: relative;
}

.nav-menu > li > a {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    color: var(--nav-text);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 8px;
    transition: var(--nav-transition);
    position: relative;
    white-space: nowrap;
}

.nav-menu > li > a:hover,
.nav-menu > li > a.active {
    color: var(--nav-text-hover);
    background: rgba(255, 255, 255, 0.06);
}

.nav-menu > li > a.active {
    background: rgba(30, 103, 185, 0.2);
    color: var(--nav-accent);
}

.nav-menu > li > a.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--nav-accent);
    border-radius: 2px;
}

/* ===== Dropdown ===== */
.nav-dropdown-toggle {
    cursor: pointer;
    user-select: none;
}

.nav-dropdown-toggle .dropdown-arrow {
    font-size: 0.7em;
    transition: transform 0.3s ease;
    margin-left: 4px;
}

.nav-dropdown.active .nav-dropdown-toggle .dropdown-arrow {
    transform: rotate(180deg);
}

.nav-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(8px);
    background: var(--nav-dropdown-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--nav-border);
    border-radius: 12px;
    padding: 8px;
    min-width: 220px;
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transition: all 0.25s ease;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    margin-top: 8px;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.active .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.nav-dropdown-menu li a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    color: var(--nav-text);
    text-decoration: none;
    font-size: 0.9rem;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.nav-dropdown-menu li a:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--nav-text-hover);
    padding-left: 20px;
}

.nav-dropdown-menu li a i {
    width: 18px;
    text-align: center;
    opacity: 0.7;
}

/* ===== Mobile Toggle ===== */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--nav-border);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--nav-transition);
    gap: 5px;
    padding: 0;
}

.nav-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

.nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--nav-text);
    border-radius: 1px;
    transition: var(--nav-transition);
    transform-origin: center;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Mobile Menu ===== */
.nav-mobile {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--nav-bg-solid);
    backdrop-filter: blur(20px);
    z-index: 999;
    padding: 100px 24px 24px;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s ease;
}

.nav-mobile.active {
    opacity: 1;
    visibility: visible;
}

.nav-mobile-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-mobile-menu li {
    border-bottom: 1px solid var(--nav-border);
}

.nav-mobile-menu li a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 18px 0;
    color: var(--nav-text);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    transition: var(--nav-transition);
}

.nav-mobile-menu li a:hover,
.nav-mobile-menu li a.active {
    color: var(--nav-accent);
    padding-left: 8px;
}

.nav-mobile-menu li a i {
    width: 24px;
    text-align: center;
    opacity: 0.7;
}

/* Mobile Dropdown */
.nav-mobile-dropdown-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 18px 0;
    color: var(--nav-text);
    font-size: 1.1rem;
    font-weight: 500;
    background: none;
    border: none;
    border-bottom: 1px solid var(--nav-border);
    cursor: pointer;
    transition: var(--nav-transition);
}

.nav-mobile-dropdown-toggle:hover {
    color: var(--nav-accent);
}

.nav-mobile-dropdown {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.nav-mobile-dropdown.active {
    max-height: 300px;
}

.nav-mobile-dropdown li a {
    padding-left: 36px;
    font-size: 1rem;
    opacity: 0.85;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .nav-container {
        padding: 0 20px;
    }
    
    .nav-menu > li > a {
        padding: 8px 12px;
        font-size: 0.85rem;
    }
}

@media (max-width: 768px) {
    :root {
        --nav-height: 72px;
        --nav-height-scrolled: 64px;
    }
    
    body {
        padding-top: var(--nav-height);
    }
    
    body.nav-scrolled {
        padding-top: var(--nav-height-scrolled);
    }
    
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-mobile {
        display: block;
    }
    
    .nav-logo img {
        height: 34px;
    }
    
    .navbar.scrolled .nav-logo img {
        height: 30px;
    }
}

@media (max-width: 480px) {
    :root {
        --nav-height: 64px;
        --nav-height-scrolled: 56px;
    }
    
    .nav-container {
        padding: 0 16px;
    }
    
    .nav-logo img {
        height: 30px;
    }
    
    .nav-toggle {
        width: 36px;
        height: 36px;
    }
    
    .nav-toggle span {
        width: 18px;
    }
}

/* ===== Scrollbar ===== */
.nav-mobile::-webkit-scrollbar {
    width: 4px;
}

.nav-mobile::-webkit-scrollbar-track {
    background: transparent;
}

.nav-mobile::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 2px;
}