/* Header Styles */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    will-change: background;
    z-index: 1000;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    height: 70px; /* Fixed header height for calculations */
}

/* Scroll Progress Bar */
.scroll-progress-bar {
    position: absolute;
    top: 0;
    left: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    width: 0%;
    transition: width 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    z-index: 1001;
    box-shadow: 0 0 10px rgba(240, 64, 55, 0.3);
}

.navbar {
    padding: 1rem 0;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    height: 40px;
    width: auto;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-symbol {
    height: 40px;
    width: auto;
}

.logo-text {
    font-family: 'Inter', sans-serif;
    font-size: 18px;
    font-weight: 600;
    line-height: 1.1;
    color: #333;
    letter-spacing: -0.5px;
}

.nav-menu {
    /* Base (desktop) styles */
    position: static;
    left: 0;
    width: auto;
    height: auto;
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    background: transparent;
    border-top: none;
}

.nav-menu.active {
    left: 0;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    height: 40px;
    width: auto;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    font-size: 0.9rem;
    letter-spacing: 0.8px;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
    overflow: hidden;
    padding: 0.5rem 0;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #F04037, #E53935);
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    transform: translateX(-50%);
    border-radius: 2px;
}

.nav-link:hover::before {
    width: 100%;
}

.nav-link:hover {
    color: #F04037;
    transform: translateY(-1px);
}

.nav-link.active {
    color: #ff4444;
}

.nav-link.active::before {
    width: 100%;
}

.hamburger {
    display: none; /* hidden by default (desktop) */
    flex-direction: column;
    position: absolute;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
    z-index: 10001; /* above header */
}

.bar {
    width: 25px;
    height: 3px;
    background-color: #333;
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
    display: block;
}